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Node.js Application Monitoring with Prometheus and Grafana

Hi guys, we published this article on our blog (here) some time ago and I thought it could be interesting for node to read is as well, since we got some good feedback on it!

What is application monitoring and why is it necessary?

Application monitoring is a method that uses software tools to gain insights into your software deployments. This can be achieved by simple health checks to see if the server is available to more advanced setups where a monitoring library is integrated into your server that sends data to a dedicated monitoring service. It can even involve the client side of your application, offering more detailed insights into the user experience.
For every developer, monitoring should be a crucial part of the daily work, because you need to know how the software behaves in production. You can let your testers work with your system and try to mock interactions or high loads, but these techniques will never be the same as the real production workload.

What is Prometheus and how does it work?

Prometheus is an open-source monitoring system that was created in 2012 by Soundcloud. In 2016, Prometheus became the second project (following Kubernetes) to be hosted by the Cloud Native Computing Foundation.
https://preview.redd.it/8kshgh0qpor51.png?width=1460&format=png&auto=webp&s=455c37b1b1b168d732e391a882598e165c42501a
The Prometheus server collects metrics from your servers and other monitoring targets by pulling their metric endpoints over HTTP at a predefined time interval. For ephemeral and batch jobs, for which metrics can't be scraped periodically due to their short-lived nature, Prometheus offers a Pushgateway. This is an intermediate server that monitoring targets can push their metrics before exiting. The data is retained there until the Prometheus server pulls it later.
The core data structure of Prometheus is the time series, which is essentially a list of timestamped values that are grouped by metric.
With PromQL (Prometheus Query Language), Prometheus provides a functional query language allowing for selection and aggregation of time series data in real-time. The result of a query can be viewed directly in the Prometheus web UI, or consumed by external systems such as Grafana via the HTTP API.

How to use prom-client to export metrics in Node.js for Prometheus?

prom-client is the most popular Prometheus client library for Node.js. It provides the building blocks to export metrics to Prometheus via the pull and push methods and supports all Prometheus metric types such as histogram, summaries, gauges and counters.

Setup sample Node.js project

Create a new directory and set up the Node.js project:
$ mkdir example-nodejs-app $ cd example-nodejs-app $ npm init -y 

Install prom-client

The prom-client npm module can be installed via:
$ npm install prom-client 

Exposing default metrics

Every Prometheus client library comes with predefined default metrics that are assumed to be good for all applications on the specific runtime. The prom-client library also follows this convention. The default metrics are useful for monitoring the usage of resources such as memory and CPU.
You can capture and expose the default metrics with following code snippet:
const http = require('http') const url = require('url') const client = require('prom-client') // Create a Registry which registers the metrics const register = new client.Registry() // Add a default label which is added to all metrics register.setDefaultLabels({ app: 'example-nodejs-app' }) // Enable the collection of default metrics client.collectDefaultMetrics({ register }) // Define the HTTP server const server = http.createServer(async (req, res) => { // Retrieve route from request object const route = url.parse(req.url).pathname if (route === '/metrics') { // Return all metrics the Prometheus exposition format res.setHeader('Content-Type', register.contentType) res.end(register.metrics()) } }) // Start the HTTP server which exposes the metrics on http://localhost:8080/metrics server.listen(8080) 

Exposing custom metrics

While default metrics are a good starting point, at some point, you’ll need to define custom metrics in order to stay on top of things.
Capturing and exposing a custom metric for HTTP request durations might look like this:
const http = require('http') const url = require('url') const client = require('prom-client') // Create a Registry which registers the metrics const register = new client.Registry() // Add a default label which is added to all metrics register.setDefaultLabels({ app: 'example-nodejs-app' }) // Enable the collection of default metrics client.collectDefaultMetrics({ register }) // Create a histogram metric const httpRequestDurationMicroseconds = new client.Histogram({ name: 'http_request_duration_seconds', help: 'Duration of HTTP requests in microseconds', labelNames: ['method', 'route', 'code'], buckets: [0.1, 0.3, 0.5, 0.7, 1, 3, 5, 7, 10] }) // Register the histogram register.registerMetric(httpRequestDurationMicroseconds) // Define the HTTP server const server = http.createServer(async (req, res) => { // Start the timer const end = httpRequestDurationMicroseconds.startTimer() // Retrieve route from request object const route = url.parse(req.url).pathname if (route === '/metrics') { // Return all metrics the Prometheus exposition format res.setHeader('Content-Type', register.contentType) res.end(register.metrics()) } // End timer and add labels end({ route, code: res.statusCode, method: req.method }) }) // Start the HTTP server which exposes the metrics on http://localhost:8080/metrics server.listen(8080) 
Copy the above code into a file called server.jsand start the Node.js HTTP server with following command:
$ node server.js 
You should now be able to access the metrics via http://localhost:8080/metrics.

How to scrape metrics from Prometheus

Prometheus is available as Docker image and can be configured via a YAML file.
Create a configuration file called prometheus.ymlwith following content:
global: scrape_interval: 5s scrape_configs: - job_name: "example-nodejs-app" static_configs: - targets: ["docker.for.mac.host.internal:8080"] 
The config file tells Prometheus to scrape all targets every 5 seconds. The targets are defined under scrape_configs. On Mac, you need to use docker.for.mac.host.internal as host, so that the Prometheus Docker container can scrape the metrics of the local Node.js HTTP server. On Windows, use docker.for.win.localhost and for Linux use localhost.
Use the docker run command to start the Prometheus Docker container and mount the configuration file (prometheus.yml):
$ docker run --rm -p 9090:9090 \ -v `pwd`/prometheus.yml:/etc/prometheus/prometheus.yml \ prom/prometheus:v2.20.1 
Windows users need to replace pwd with the path to their current working directory.
You should now be able to access the Prometheus Web UI on http://localhost:9090

What is Grafana and how does it work?

Grafana is a web application that allows you to visualize data sources via graphs or charts. It comes with a variety of chart types, allowing you to choose whatever fits your monitoring data needs. Multiple charts are grouped into dashboards in Grafana, so that multiple metrics can be viewed at once.
https://preview.redd.it/vt8jwu8vpor51.png?width=3584&format=png&auto=webp&s=4101843c84cfc6293debcdfc3bdbe70811dab2e9
The metrics displayed in the Grafana charts come from data sources. Prometheus is one of the supported data sources for Grafana, but it can also use other systems, like AWS CloudWatch, or Azure Monitor.
Grafana also allows you to define alerts that will be triggered if certain issues arise, meaning you’ll receive an email notification if something goes wrong. For a more advanced alerting setup checkout the Grafana integration for Opsgenie.

Starting Grafana

Grafana is also available as Docker container. Grafana datasources can be configured via a configuration file.
Create a configuration file called datasources.ymlwith the following content:
apiVersion: 1 datasources: - name: Prometheus type: prometheus access: proxy orgId: 1 url: http://docker.for.mac.host.internal:9090 basicAuth: false isDefault: true editable: true 
The configuration file specifies Prometheus as a datasource for Grafana. Please note that on Mac, we need to use docker.for.mac.host.internal as host, so that Grafana can access Prometheus. On Windows, use docker.for.win.localhost and for Linux use localhost.
Use the following command to start a Grafana Docker container and to mount the configuration file of the datasources (datasources.yml). We also pass some environment variables to disable the login form and to allow anonymous access to Grafana:
$ docker run --rm -p 3000:3000 \ -e GF_AUTH_DISABLE_LOGIN_FORM=true \ -e GF_AUTH_ANONYMOUS_ENABLED=true \ -e GF_AUTH_ANONYMOUS_ORG_ROLE=Admin \ -v `pwd`/datasources.yml:/etc/grafana/provisioning/datasources/datasources.yml \ grafana/grafana:7.1.5 
Windows users need to replace pwd with the path to their current working directory.
You should now be able to access the Grafana Web UI on http://localhost:3000

Configuring a Grafana Dashboard

Once the metrics are available in Prometheus, we want to view them in Grafana. This requires creating a dashboard and adding panels to that dashboard:
  1. Go to the Grafana UI at http://localhost:3000, click the + button on the left, and select Dashboard.
  2. In the new dashboard, click on the Add new panel button.
  3. In the Edit panel view, you can select a metric and configure a chart for it.
  4. The Metrics drop-down on the bottom left allows you to choose from the available metrics. Let’s use one of the default metrics for this example.
  5. Type process_resident_memory_bytesinto the Metricsinput and {{app}}into the Legendinput.
  6. On the right panel, enter Memory Usage for the Panel title.
  7. As the unit of the metric is in bytes we need to select bytes(Metric)for the left y-axis in the Axes section, so that the chart is easy to read for humans.
You should now see a chart showing the memory usage of the Node.js HTTP server.
Press Apply to save the panel. Back on the dashboard, click the small "save" symbol at the top right, a pop-up will appear allowing you to save your newly created dashboard for later use.

Setting up alerts in Grafana

Since nobody wants to sit in front of Grafana all day watching and waiting to see if things go wrong, Grafana allows you to define alerts. These alerts regularly check whether a metric adheres to a specific rule, for example, whether the errors per second have exceeded a specific value.
Alerts can be set up for every panel in your dashboards.
  1. Go into the Grafana dashboard we just created.
  2. Click on a panel title and select edit.
  3. Once in the edit view, select "Alerts" from the middle tabs, and press the Create Alertbutton.
  4. In the Conditions section specify 42000000 after IS ABOVE. This tells Grafana to trigger an alert when the Node.js HTTP server consumes more than 42 MB Memory.
  5. Save the alert by pressing the Apply button in the top right.

Sample code repository

We created a code repository that contains a collection of Docker containers with Prometheus, Grafana, and a Node.js sample application. It also contains a Grafana dashboard, which follows the RED monitoring methodology.
Clone the repository:
$ git clone https://github.com/coder-society/nodejs-application-monitoring-with-prometheus-and-grafana.git 
The JavaScript code of the Node.js app is located in the /example-nodejs-app directory. All containers can be started conveniently with docker-compose. Run the following command in the project root directory:
$ docker-compose up -d 
After executing the command, a Node.js app, Grafana, and Prometheus will be running in the background. The charts of the gathered metrics can be accessed and viewed via the Grafana UI at http://localhost:3000/d/1DYaynomMk/example-service-dashboard.
To generate traffic for the Node.js app, we will use the ApacheBench command line tool, which allows sending requests from the command line.
On MacOS, it comes pre-installed by default. On Debian-based Linux distributions, ApacheBench can be installed with the following command:
$ apt-get install apache2-utils 
For Windows, you can download the binaries from Apache Lounge as a ZIP archive. ApacheBench will be named ab.exe in that archive.
This CLI command will run ApacheBench so that it sends 10,000 requests to the /order endpoint of the Node.js app:
$ ab -m POST -n 10000 -c 100 http://localhost:8080/order 
Depending on your hardware, running this command may take some time.
After running the ab command, you can access the Grafana dashboard via http://localhost:3000/d/1DYaynomMk/example-service-dashboard.

Summary

Prometheus is a powerful open-source tool for self-hosted monitoring. It’s a good option for cases in which you don’t want to build from scratch but also don’t want to invest in a SaaS solution.
With a community-supported client library for Node.js and numerous client libraries for other languages, the monitoring of all your systems can be bundled into one place.
Its integration is straightforward, involving just a few lines of code. It can be done directly for long-running services or with help of a push server for short-lived jobs and FaaS-based implementations.
Grafana is also an open-source tool that integrates well with Prometheus. Among the many benefits it offers are flexible configuration, dashboards that allow you to visualize any relevant metric, and alerts to notify of any anomalous behavior.
These two tools combined offer a straightforward way to get insights into your systems. Prometheus offers huge flexibility in terms of metrics gathered and Grafana offers many different graphs to display these metrics. Prometheus and Grafana also integrate so well with each other that it’s surprising they’re not part of one product.
You should now have a good understanding of Prometheus and Grafana and how to make use of them to monitor your Node.js projects in order to gain more insights and confidence in your software deployments.
submitted by matthevva to node [link] [comments]

Release: Tdarr Beta v1.102 release [18th Jan 2020]:

https://github.com/HaveAGitGat/Tdarreleases/tag/v1.102-Beta

Changes:
Beta v1.102 release [18th Jan 2020]: Changes: -[New] Plugin creator option (Filter by age) - select 'Date created' or 'Date modified' -[New] Plugin creator option (Filter by age) - include files OLDER than specified time -[New] Options to sort queue by date (Scanned, Created, Modified) -[Fix] Audio file codec not showing in search results -[Fix] MJPEG video incorrectly tagged as audio file -[Fix] Default plugin priority -[Fix] 'Too many packets buffered for output stream' when health checking -[Fix] Folder path placeholder text

Previous changes:
Beta v1.101 release [6th Dec 19]: Changes: -[New] Force processing of files -[New] Action: HandBrake basic options -[New] Action: Add one audio stream -[New] Action: Keep one audio stream -[New] Action: Standardise audio stream codecs -[New] Channel count now shown in streams table -[Fix] Rare search result bug (no results shown) -[Fix] Audio files with cover art being detected as video
Alpha v1.008 release [1st Dec 19]: Changes: -[New] Plugin creator UI and groundwork for future Filters and Actions. Filters now encapsulate Action taken. No separate Filter needed -[New] Re-order streams plugin added by default for new libraries -[New] Backup and restore feature (scheduled midnight backup) -[New] Toggle copying to output folder if file already meets conditions -[Improvement] Change to how plugins are imported. Built-in NodeJS modules can now be used when creating plugins. (Can use e.g. require('fs') etc) -[Improvement] Idle CPU usage drastically reduced -[Improvement] Various stability fixes -[Improvement] Confirmation needed when restoring from backup -[Fix] Video resolution boundaries improved -[Fix] Non existent files + junk removed when running Find-New scan -[Fix] Corrected error when creating remux container plugin -[Fix] If one plugin has an error, the rest will still load -[Fix] Auto cache cleaner disabled due to issues on some systems -[Fix] Move item to Transcode:Error instead of Transcode:Not required if error with plugin
Alpha v1.007 release [22nd Nov 19]: Changes: -[New] Option to enable Linux FFmpeg NVENC binary (3.4.5 for unRAID compatibility) -[New] Option to ignore source sub-folders -[New] Skip health check button -[New] Option to change visible queue length -[New] Option to duplicate library -[New] Customise search result columns -[New] UI improvements (@jono) -[New] Option to delete source file when using folder to folder conversion. -[New] Community plugins (Remove commentary tracks etc) -[New] Option to delete local plugins -[New] Auto clean cache folder + preventing non-Tdarr cache files being deleted in case of incorrect mapping. -[Fix] Reset processing status of all files on startup so no files stuck in limbo -[Fix] Transcode pie showing incorrect data -[Fix] Folder watcher will now wait longer to detect if a new file has finished copying -[Fix] Folder to folder conversion: Files which already meet requirements will be copied to output folder -[Fix] Folder to folder conversion: Cache/Output folder bug -[Fix] Default containers to scan for now include ts/m2ts -[Fix] Keep all stream types when using remux plugin creator -[Fix] Prevent too many workers occassionally starting -[Fix] Newly transcoded files will be bumped correctly to top of queue when sorting by size -[Fix] Closed caption scanning now much faster & accurate (even on empty captions) -[Fix] Plugin creator plugin path error -[Fix] Health check error when using FFmpeg hardware transcoding
Alpha v1.006 release [9th Nov 19]: Changes: -[New] NVENC for FFmpeg enabled (linux + tdarr_aio) -[New] Per library stat breakdown -[New] Plugin creator -[New] Plugin creator option - Filter by codec -[New] Plugin creator option - Filter by date -[New] Plugin creator option - Filter by medium -[New] Plugin creator option - Filter by size -[New] Plugin creator option - Filter by resolution -[New] Plugin creator option - Transcode -[New] Plugin creator option - Remux container -[New] Option to detect closed captions (linux + tdarr_aio + windows) -[New] Community plugin - remove closed captions -[New] Configurable plugin stack (mix local and community plugins, re-order etc) -[New] Folder to folder conversion (feedback needed, test first) -[New] Skip transcoding button -[New] Options tab - set base URL -[New] Remove item from library button -[New] Exclude codec whitelist/blacklist -[New] Navgiation bar UI -[New] Queue library alternation option -[Fix] 'Re-queue' buttons on 'Tdarr' tab -[Fix] Prevent find-new/fresh scans occuring on a library at the same time. Hourly find-new scan re-enabled for libraries with folder watch ON. -[Fix] Library prioritisation sort -[Fix] Reduced search result number for quicker render + UI changes
Alpha v1.005 release [1st Nov 19]: Changes: -[New] UI overhaul (Dark theme) -[New] Hardware transcoding using tdarr_aio container + HandBrake -[New] Improved bump-file system -[New] Improved plugin/transcode formatting -[New] File history -[New] Search tab shows queue position, streams, file history + more -[New] Sort and filter search results -[New] Prioritise libraries -[New] Sort queues by size/date created -[New] Full file path shown on workers -[New] Total file count shown when files being scanned/processed -[New] Search local plugins -[New] Set base URL with env variable -[New] Requeue-all buttons added to Tdarr tab -[Fix] Library requeue buttons requeue only specified library -[Fix] Ubuntu container permissions -[Fix] File scanner logs -[Fix] Video height boundaries reduced for 720p,180p etc -[Fix] Bigger font through-out
Alpha v1.004 release [23rd Oct 19]: Changes: -Scan on start switch added -Prevent Tdarr temp output files mistakenly being scanned -Docker memory fix for large libraries (30,000+ files) -Improved garbage collection -Temp scanner data written inside container (Should fix permission issues with host) -tdarr_aio (All-in-one) Ubuntu container now available with MongoDB inside container.
Alpha v1.003 release [10th Oct 19]: Changes: -Workers now show more detailed information: ETA, CLI type, preset, process reasons, start time, duration and original file size. -Help links updated -Improvements to FFmpeg percentages -Switch to turn processing of a library On/Off -Can now click on Pie-chart segments to see files in those segments -'Not attempted' items renamed to 'Queued'. 'Transcode:Passed' items renamed to 'Transcode:Not required' -Status tables have been put into tabs. Each tab shows the number of related items on it (e.g. No. items in queue.) Additional information added to items (codec,resolution etc) -Date time stamp now shown on processed items. Old/New size now shown for transcode items. -HandBrake and FFmpeg terminal implemented on the 'Help' tab. This is mainly so you can see documentation such as what encoder types are enabled etc but any HandBrake/FFmpeg commands can be put into the terminal. -Create a sample button added to items in Search results. Clicking the button will create a 30 second sample of the selected file and output it in the new 'Samples' folder in the Tdarr data folder. Use the sample to test plugins/transcode settings and to help when reporting bugs. -Additional schedule buttons added so you can bulk change daily hour slots. -Reduced 720p boundaries so now 960*720 video files will show up in the 720p category instead of just 1280*720 files.
submitted by HaveAGitGat to Tdarr [link] [comments]

Временно бесплатные курсы Udemy

Временно бесплатные курсы Udemy

https://preview.redd.it/se7zt100k9c31.jpg?width=700&format=pjpg&auto=webp&s=b7d9eb97754935764b044d2dd31900c6106efab5
Подборка временно бесплатных курсов Udemy.122 шт. Промокоды, вшиты в ссылки.Все курсы на английском.

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63. Facebook Ads 101. Complete Facebook Ads & Marketing Course
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submitted by abbelrus to Pikabu [link] [comments]

Issuing doing npm install on Jenkins for Vue project

I have a Jenkins build I am using for a Vue.js application. I am trying to install all dependancies as part of the pipeline and am running into some issues. I've included the below output as well as the npm install part of my pipeline.

It looks like a python issue to me however I don't think I'm using python unless vue uses it under the hood

error from below build step
+ npm install > [email protected] install /valib/jenkins/workspace/Deploy UI/node_modules/node-sass > node scripts/install.js Downloading binary from https://github.com/sass/node-sass/releases/download/v4.12.0/linux-x64-79_binding.node Cannot download "https://github.com/sass/node-sass/releases/download/v4.12.0/linux-x64-79_binding.node": HTTP error 404 Not Found Hint: If github.com is not accessible in your location try setting a proxy via HTTP_PROXY, e.g. export HTTP_PROXY=http://example.com:1234 or configure npm proxy via npm config set proxy http://example.com:8080 > [email protected] postinstall /valib/jenkins/workspace/Deploy UI/node_modules/node-sass > node scripts/build.js Building: /valib/jenkins/tools/jenkins.plugins.nodejs.tools.NodeJSInstallation/UI/bin/node /valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/bin/node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library= gyp info it worked if it ends with ok gyp verb cli [ gyp verb cli '/valib/jenkins/tools/jenkins.plugins.nodejs.tools.NodeJSInstallation/UI/bin/node', gyp verb cli '/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/bin/node-gyp.js', gyp verb cli 'rebuild', gyp verb cli '--verbose', gyp verb cli '--libsass_ext=', gyp verb cli '--libsass_cflags=', gyp verb cli '--libsass_ldflags=', gyp verb cli '--libsass_library=' gyp verb cli ] gyp info using [email protected] gyp info using [email protected] | linux | x64 gyp verb command rebuild [] gyp verb command clean [] gyp verb clean removing "build" directory gyp verb command configure [] gyp verb check python checking for Python executable "python2" in the PATH gyp verb `which` failed Error: not found: python2 gyp verb `which` failed at getNotFoundError (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:13:12) gyp verb `which` failed at F (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:68:19) gyp verb `which` failed at E (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:80:29) gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:89:16 gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/index.js:42:5 gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/mode.js:8:5 gyp verb `which` failed at FSReqCallback.oncomplete (fs.js:158:21) gyp verb `which` failed python2 Error: not found: python2 gyp verb `which` failed at getNotFoundError (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:13:12) gyp verb `which` failed at F (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:68:19) gyp verb `which` failed at E (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:80:29) gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:89:16 gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/index.js:42:5 gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/mode.js:8:5 gyp verb `which` failed at FSReqCallback.oncomplete (fs.js:158:21) { gyp verb `which` failed stack: 'Error: not found: python2\n' + gyp verb `which` failed ' at getNotFoundError (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:13:12)\n' + gyp verb `which` failed ' at F (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:68:19)\n' + gyp verb `which` failed ' at E (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:80:29)\n' + gyp verb `which` failed ' at /valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:89:16\n' + gyp verb `which` failed ' at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/index.js:42:5\n' + gyp verb `which` failed ' at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/mode.js:8:5\n' + gyp verb `which` failed ' at FSReqCallback.oncomplete (fs.js:158:21)', gyp verb `which` failed code: 'ENOENT' gyp verb `which` failed } gyp verb check python checking for Python executable "python" in the PATH gyp verb `which` failed Error: not found: python gyp verb `which` failed at getNotFoundError (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:13:12) gyp verb `which` failed at F (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:68:19) gyp verb `which` failed at E (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:80:29) gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:89:16 gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/index.js:42:5 gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/mode.js:8:5 gyp verb `which` failed at FSReqCallback.oncomplete (fs.js:158:21) gyp verb `which` failed python Error: not found: python gyp verb `which` failed at getNotFoundError (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:13:12) gyp verb `which` failed at F (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:68:19) gyp verb `which` failed at E (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:80:29) gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:89:16 gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/index.js:42:5 gyp verb `which` failed at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/mode.js:8:5 gyp verb `which` failed at FSReqCallback.oncomplete (fs.js:158:21) { gyp verb `which` failed stack: 'Error: not found: python\n' + gyp verb `which` failed ' at getNotFoundError (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:13:12)\n' + gyp verb `which` failed ' at F (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:68:19)\n' + gyp verb `which` failed ' at E (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:80:29)\n' + gyp verb `which` failed ' at /valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:89:16\n' + gyp verb `which` failed ' at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/index.js:42:5\n' + gyp verb `which` failed ' at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/mode.js:8:5\n' + gyp verb `which` failed ' at FSReqCallback.oncomplete (fs.js:158:21)', gyp verb `which` failed code: 'ENOENT' gyp verb `which` failed } gyp ERR! configure error gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable. gyp ERR! stack at PythonFinder.failNoPython (/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/lib/configure.js:484:19) gyp ERR! stack at PythonFinder. (/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/lib/configure.js:406:16) gyp ERR! stack at F (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:68:16) gyp ERR! stack at E (/valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:80:29) gyp ERR! stack at /valib/jenkins/workspace/Deploy UI/node_modules/which/which.js:89:16 gyp ERR! stack at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/index.js:42:5 gyp ERR! stack at /valib/jenkins/workspace/Deploy UI/node_modules/isexe/mode.js:8:5 gyp ERR! stack at FSReqCallback.oncomplete (fs.js:158:21) gyp ERR! System Linux 4.15.0-1052-aws gyp ERR! command "/valib/jenkins/tools/jenkins.plugins.nodejs.tools.NodeJSInstallation/UI/bin/node" "/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library=" gyp ERR! cwd /valib/jenkins/workspace/Deploy UI/node_modules/node-sass gyp ERR! node -v v13.1.0 gyp ERR! node-gyp -v v3.8.0 gyp ERR! not ok Build failed with error code: 1 npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"}) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! [email protected] postinstall: `node scripts/build.js` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the [email protected] postinstall script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR! /valib/jenkins/workspace/Deploy UI/.npm/_logs/2019-11-12T02_15_01_035Z-debug.log 
package.json
"dependencies": { "@agametov/vueditor": "^0.4.1", "@chenfengyuan/vue-countdown": "^1.1.2", "apexcharts": "^3.8.3", "axios": "^0.19.0", "bootstrap": "^4.3.1", "bootstrap-social": "^5.1.1", "bootstrap-vue": "^2.0.0-rc.27", "chart.js": "^2.8.0", "flag-icon-css": "^3.3.0", "ionicons": "^4.6.2", "moment": "^2.24.0", "node-sass": "^4.12.0", "sass-loader": "^7.1.0", "simple-line-icons": "^2.4.1", "v-autocomplete": "^1.8.2", "vue": "^2.6.10", "vue-apexcharts": "^1.4.0", "vue-bootstrap-datetimepicker": "^5.0.1", "vue-chartjs": "^3.4.2", "vue-custom-scrollbar": "^1.1.0", "vue-event-calendar": "^1.5.2", "vue-full-calendar": "^2.7.0", "vue-good-table": "^2.17.4", "vue-hljs": "^1.1.2", "vue-input-tag": "^2.0.6", "vue-ins-progress-bar": "^1.0.0", "vue-maskedinput": "^0.1.3", "vue-moment": "^4.0.0", "vue-notification": "^1.3.16", "vue-nvd3": "^1.0.0", "vue-pop-colorpicker": "^1.0.2", "vue-router": "^3.0.7", "vue-select": "^3.1.0", "vue-slider-component": "^3.0.33", "vue-sparklines": "^0.1.9", "vue-stripe-elements-plus": "^0.3.2", "vue-sweetalert2": "^2.1.1", "vue2-google-maps": "^0.10.7", "vuejs-datepicker": "^1.6.2" }, "devDependencies": { "@vue/cli-plugin-babel": "^3.9.2", "@vue/cli-plugin-eslint": "^3.9.2", "@vue/cli-service": "^3.9.3", "vue-template-compiler": "^2.6.10" }, 


my pipeline code
stage('Build') { steps { nodejs(nodeJSInstallationName: 'UI') { sh "npm install && npm install --only=dev && npm run build --${params.buildenv}" } } } 

installed python via the apt repo and ran into a bigger (longer) error message. I can't include here as too long (tried already)

A bunch of lines about node openssl like the below

gyp verb extracted file from tarball include/node/openssl/aes.h 


gyp verb tarball done parsing tarball gyp verb check download content checksum, need to download `SHASUMS256.txt`... gyp verb checksum url https://nodejs.org/download/release/v13.1.0/SHASUMS256.txt gyp http GET https://nodejs.org/download/release/v13.1.0/SHASUMS256.txt gyp http 200 https://nodejs.org/download/release/v13.1.0/SHASUMS256.txt gyp verb checksum data {"node-v13.1.0-aix-ppc64.tar.gz":"5faec026afe9052f277402500236dd9ec4d58e0e8de93f66989fc337c65e33c8","node-v13.1.0-darwin-x64.tar.gz":"6501c1bcf2babb5b9c81dcff8b52021f726da8f6ee28df1637acade1a16c7d39","node-v13.1.0-darwin-x64.tar.xz":"b918bdc6ca5726084a737c926744cdaecde624ba39ac8aaed889f296007a5094","node-v13.1.0-headers.tar.gz":"577785216f5a4097a9108fd05f3117556f0954f0a03a26cfbfd1ce7af94587d4","node-v13.1.0-headers.tar.xz":"73ec6759903137d3e22806e745777cb7cda3150f0d81c5ba13e7599c2be03d32","node-v13.1.0-linux-arm64.tar.gz":"dd36c7846f7713b6e55baf0b6ab7882c18b129d83a3d0f7ef62790d181461d22","node-v13.1.0-linux-arm64.tar.xz":"646d597e6b0dc400429e46b703a5135c77bd71e653ea4c8254d0b60c17b6ec1d","node-v13.1.0-linux-armv7l.tar.gz":"88450bc38dac0be15c9bd09bfccf4ce79f1911930f37658c730c151b26c5aa97","node-v13.1.0-linux-armv7l.tar.xz":"e15601106fbd9ed75a4642eab91bb3f3ddab8b5821e886bdb070c014d9ab9af2","node-v13.1.0-linux-ppc64le.tar.gz":"0c804f0671bcdada9be66e4ca844c08f897357fbf2426be8cc326d20e6362833","node-v13.1.0-linux-ppc64le.tar.xz":"561dbaa36db7dcb4fff378e110b4ddd29d918754e73449208899fbfb9f3ce1ae","node-v13.1.0-linux-s390x.tar.gz":"24c29e917230d9cc510ba764ff6ef57bcc816520c146b47dce3ed4aeb3f7d333","node-v13.1.0-linux-s390x.tar.xz":"a3229a795ee8bda15396701badd31d695d9a6f487a730c73022305c98522767a","node-v13.1.0-linux-x64.tar.gz":"490e998198e152450e79bb65178813ce0c81708954697f91cfd82537acfcb588","node-v13.1.0-linux-x64.tar.xz":"2eecb5a4b7975c3b406bee36b12c9a29e8bedf9553c88cad310b8f076db00881","node-v13.1.0.pkg":"3b6abd2a5f7a5778bbe5363ea222910b19674648eb2b3d734d9ee751ec29da71","node-v13.1.0-sunos-x64.tar.gz":"8e17a613950018e27f34f7268e01cbb385777189961ccf386f7d0d05883687b3","node-v13.1.0-sunos-x64.tar.xz":"e9dd61b7f537b98a6656c0e03766997aa712bf3d40e7cb08ba4019e942846739","node-v13.1.0.tar.gz":"df640a2f151f788d02dc25c91d80fffe06b4c3c72fbdee07ab9abd7c6879d6cd","node-v13.1.0.tar.xz":"d42c056cbd33b35836b0f5cfb2c56712b965ea76e188ef79af492614cf14cb68","node-v13.1.0-win-x64.7z":"8f242259fa929f759f06bb1cf399df3b81061eb1ce5ccaa9d206dc157fcf93fc","node-v13.1.0-win-x64.zip":"d735e97bdeb7b74551b9d165c708a3fdea4dbb3801a65e70f6d6ae3539d48a03","node-v13.1.0-win-x86.7z":"c4ecf16dd147956c9335b547fdfb1b0eb1c333c1a1722843b45ba04b9fee17fe","node-v13.1.0-win-x86.zip":"81af54ba9e852073ac975aa0955da1efb4b2ea6ef213eb3ce90f3b22a82555d8","node-v13.1.0-x64.msi":"22ec0be47b0f3f5f163f82e18c01df456921f39b756ee4a828534264b06d0fe6","node-v13.1.0-x86.msi":"7f56fa7350eaf0da6d33b24578a281e8d759a9344e5c8ea851ea541eaebb94fe","win-x64/node.exe":"5c3b0006330a08743363ebf26ccdf1618ab0269f50756088b6e5257d7a32c5a1","win-x64/node.lib":"aa183bbe6f7a2b63395ff83ac6f687274bafbc1e64be2e6e5bb600dc1e5c7bea","win-x64/node_pdb.7z":"7e4bc02444eea52b90d15d1985789aa10efa5b058a6550aac389db3eba42a4b7","win-x64/node_pdb.zip":"ae389590498393e57379d462b3d8d6c2639afcf04d6c279f99b8e2122b98b94e","win-x86/node.exe":"20fb3aa33b88628c533e59fec344db02683434cfbd91d70a36e3a0c3f865ed03","win-x86/node.lib":"caa896eb2249fdf32ed3dda1c7bdb8250b8dbdf6f5498b10a4dec91f541d2d11","win-x86/node_pdb.7z":"e2301d3ae38b01fecceb8111955568a741183de87d05c88a6499abfca1e913b1","win-x86/node_pdb.zip":"5d9cc82ef9f2165f08ad4057b23c90154bf6a334ed7f9d3b5757003f70f49108"} gyp verb download contents checksum {"node-v13.1.0-headers.tar.gz":"577785216f5a4097a9108fd05f3117556f0954f0a03a26cfbfd1ce7af94587d4"} gyp verb validating download checksum for node-v13.1.0-headers.tar.gz (577785216f5a4097a9108fd05f3117556f0954f0a03a26cfbfd1ce7af94587d4 == 577785216f5a4097a9108fd05f3117556f0954f0a03a26cfbfd1ce7af94587d4) gyp verb get node dir target node version installed: 13.1.0 gyp verb build dir attempting to create "build" dir: /valib/jenkins/workspace/Deploy UI/node_modules/node-sass/build gyp verb build dir "build" dir needed to be created? /valib/jenkins/workspace/Deploy UI/node_modules/node-sass/build gyp verb build/config.gypi creating config file gyp verb build/config.gypi writing out config file: /valib/jenkins/workspace/Deploy UI/node_modules/node-sass/build/config.gypi gyp verb config.gypi checking for gypi file: /valib/jenkins/workspace/Deploy UI/node_modules/node-sass/config.gypi gyp verb common.gypi checking for gypi file: /valib/jenkins/workspace/Deploy UI/node_modules/node-sass/common.gypi gyp verb gyp gyp format was not specified; forcing "make" gyp info spawn /usbin/python2 gyp info spawn args [ gyp info spawn args '/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/gyp/gyp_main.py', gyp info spawn args 'binding.gyp', gyp info spawn args '-f', gyp info spawn args 'make', gyp info spawn args '-I', gyp info spawn args '/valib/jenkins/workspace/Deploy UI/node_modules/node-sass/build/config.gypi', gyp info spawn args '-I', gyp info spawn args '/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/addon.gypi', gyp info spawn args '-I', gyp info spawn args '/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/include/node/common.gypi', gyp info spawn args '-Dlibrary=shared_library', gyp info spawn args '-Dvisibility=default', gyp info spawn args '-Dnode_root_dir=/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0', gyp info spawn args '-Dnode_gyp_dir=/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp', gyp info spawn args '-Dnode_lib_file=/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/<(target_arch)/node.lib', gyp info spawn args '-Dmodule_root_dir=/valib/jenkins/workspace/Deploy UI/node_modules/node-sass', gyp info spawn args '-Dnode_engine=v8', gyp info spawn args '--depth=.', gyp info spawn args '--no-parallel', gyp info spawn args '--generator-output', gyp info spawn args 'build', gyp info spawn args '-Goutput_dir=.' gyp info spawn args ] gyp verb command build [] gyp verb build type Release gyp verb architecture x64 gyp verb node dev dir /valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0 gyp verb `which` succeeded for `make` /usbin/make gyp info spawn make gyp info spawn args [ 'V=1', 'BUILDTYPE=Release', '-C', 'build' ] make: Entering directory '/valib/jenkins/workspace/Deploy UI/node_modules/node-sass/build' g++ '-DNODE_GYP_MODULE_NAME=libsass' '-DUSING_UV_SHARED=1' '-DUSING_V8_SHARED=1' '-DV8_DEPRECATION_WARNINGS=1' '-DV8_DEPRECATION_WARNINGS' '-DV8_IMMINENT_DEPRECATION_WARNINGS' '-D_LARGEFILE_SOURCE' '-D_FILE_OFFSET_BITS=64' '-DOPENSSL_NO_PINSHARED' '-DOPENSSL_THREADS' '-DLIBSASS_VERSION="3.5.4"' -I/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/include/node -I/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/src -I/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/deps/openssl/config -I/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/deps/openssl/openssl/include -I/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/deps/uv/include -I/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/deps/zlib -I/valib/jenkins/workspace/Deploy UI/.node-gyp/13.1.0/deps/v8/include -I../src/libsass/include -fPIC -pthread -Wall -Wextra -Wno-unused-parameter -m64 -O3 -fno-omit-frame-pointer -std=gnu++1y -std=c++0x -fexceptions -frtti -MMD -MF ./Release/.deps/Release/obj.target/libsass/src/libsass/src/ast.o.d.raw -c -o Release/obj.target/libsass/src/libsass/src/ast.o ../src/libsass/src/ast.cpp g++: error: UI/.node-gyp/13.1.0/include/node: No such file or directory g++: error: UI/.node-gyp/13.1.0/src: No such file or directory g++: error: UI/.node-gyp/13.1.0/deps/openssl/config: No such file or directory g++: error: UI/.node-gyp/13.1.0/deps/openssl/openssl/include: No such file or directory g++: error: UI/.node-gyp/13.1.0/deps/uv/include: No such file or directory g++: error: UI/.node-gyp/13.1.0/deps/zlib: No such file or directory g++: error: UI/.node-gyp/13.1.0/deps/v8/include: No such file or directory src/libsass.target.mk:158: recipe for target 'Release/obj.target/libsass/src/libsass/src/ast.o' failed make: *** [Release/obj.target/libsass/src/libsass/src/ast.o] Error 1 make: Leaving directory '/valib/jenkins/workspace/Deploy UI/node_modules/node-sass/build' gyp ERR! build error gyp ERR! stack Error: `make` failed with exit code: 2 gyp ERR! stack at ChildProcess.onExit (/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/lib/build.js:262:23) gyp ERR! stack at ChildProcess.emit (events.js:210:5) gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:272:12) gyp ERR! System Linux 4.15.0-1052-aws gyp ERR! command "/valib/jenkins/tools/jenkins.plugins.nodejs.tools.NodeJSInstallation/UI/bin/node" "/valib/jenkins/workspace/Deploy UI/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library=" gyp ERR! cwd /valib/jenkins/workspace/Deploy UI/node_modules/node-sass gyp ERR! node -v v13.1.0 gyp ERR! node-gyp -v v3.8.0 gyp ERR! not ok Build failed with error code: 1 npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"}) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! [email protected] postinstall: `node scripts/build.js` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the [email protected] postinstall script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above 
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Chart.js Simple yet flexible JavaScript charting for designers & developers. Get Started Samples GitHub. New in 2.0 Mixed chart types Mix and match bar and line charts to provide a clear visual distinction between datasets. New in 2.0 New chart axis types Plot complex, sparse datasets on date time, logarithmic or even entirely custom scales with ease. New in 2.0 Animate everything! Out of the ... Teams. Q&A for Work. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Chart.js is an open source JavaScript library on Github that allows you to draw different types of charts by using the HTML5 canvas element. Since it uses canvas, you have to include a polyfill to support older browsers. I want to draw a horizontal bar chart with Chart.js but it keeps scaling the chart instead of using the height I assign the canvas form the script. Is there any way to set the height of the graph ... At time your ASP.NET Core web applications want to display certain data in the form of bar chart or pie chart. Although there are plenty third-party components and libraries that you can use to accomplish this task, Google Charts is a simple yet feature rich client side option. To that end this article shows how Google Charts can be used to render simple bar charts and pie charts. It is all about angular js and web developing. yea . Save highchart as binary image will work perfectly .While displaying the binary image into UI back ,i noticed it has some issue in some version of firfox .But the second method save highstock as bianry image will work in all browsers ,you can try either of this ,only the difference is that while using second method you have to include ... There are many breaking changes in this release of Chart.js in addition to those introduce in the previous 3.0.0-alpha release. Most will not be noticeable to users as they are in the internals of the chart, or at points where plugins & scales interface with the chart. However, there are changes to the config option format in v3 that will affect all users of Chart.js. Most noticeably, in all ... Chart.js plugin for automatic data loading. Contribute to nagix/chartjs-plugin-datasource development by creating an account on GitHub. Latest Binary Options Articles. 19 August 2018 Binary Options: Beginner's Guide 2020 Forex and CFDs . Forex and CFDs Categories. Forex Stocks Crypto ETF Latest Articles . Browse All Sections. All Sections. Review IQ Option Trading Platform Mobile Apps Guides and How-tos Demo account Chart Customization Deposits and Withdrawals Education Money management Fundamental analysis Technical analysis ... GoJS is a JavaScript library for building interactive diagrams and graphs on the web. Build apps with flowcharts, org charts, BPMN, UML, modeling, and other visual graph types. Interactivity, data-binding, layouts and many node and link concepts are built-in to GoJS.

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Simple Binary Options Strategy That Works - YouTube

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