{"id":211,"date":"2021-03-10T21:08:38","date_gmt":"2021-03-10T21:08:38","guid":{"rendered":"https:\/\/andrejacobs.org\/?p=211"},"modified":"2022-04-11T20:24:24","modified_gmt":"2022-04-11T20:24:24","slug":"100-days-of-learning-day-2-deploying-my-first-python-based-function","status":"publish","type":"post","link":"https:\/\/andrejacobs.org\/100-days-challenge\/100-days-of-learning-day-2-deploying-my-first-python-based-function\/","title":{"rendered":"100 Days of Learning: Day 2 \u2013 Deploying my first Python based function"},"content":{"rendered":"\n<p class=\"has-small-font-size\">Photo by <a href=\"https:\/\/unsplash.com\/@jstrippa?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText\">James Harrison<\/a> on <a href=\"\/collections\/63239549\/python?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText\">Unsplash<\/a><\/p>\n\n\n\n<p>Here is my\u00a0<a href=\"https:\/\/github.com\/andrejacobs\/100DayChallenges\/blob\/main\/2021%20March\/100DaysOfLearning\/100DaysOfLearning.md\">Log book<\/a><\/p>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h2>faas-cli warmup<\/h2>\n<p>For a warm up today in learning more about OpenFaaS and <code>faasd<\/code> I will first deploy the NodeInfo function using <code>faas-cli<\/code>.<\/p>\n<p>To get the list of available functions from the store<\/p>\n<pre><code class=\"language-bash\">$ faas-cli store list\n\nFUNCTION                                 DESCRIPTION\nNodeInfo                                 Get info about the machine that you'r...\nalpine                                   An Alpine Linux shell, set the &quot;fproc...\nenv                                      Print the environment variables prese...\nsleep                                    Simulate a 2s duration or pass an X-S...\nshasum                                   Generate a shasum for the given input\nFiglet                                   Generate ASCII logos with the figlet CLI\ncurl                                     Use curl for network diagnostics, pas...\n<\/code><\/pre>\n<p><strong>Learning action point:<\/strong> **How do I add more functions to the store? Can I host my own private functions and have the listed in the store? EDIT: There is a <code>--url<\/code> parameter and this is the way to private stores or other hosted stores.<\/p>\n<p>How do I install a new FaaS?<\/p>\n<pre><code class=\"language-bash\">$ faas-cli store help\n...\nAvailable Commands:\n  deploy      Deploy OpenFaaS functions from a store\n  describe    Show details of OpenFaaS function from a store\n  list        List available OpenFaaS functions in a store\n...\n<\/code><\/pre>\n<p>Lets try deploy<\/p>\n<pre><code class=\"language-bash\">$ faas-cli store deploy NodeInfo\n\nIs OpenFaaS deployed? Do you need to specify the --gateway flag?\nPut &quot;http:\/\/127.0.0.1:8080\/system\/functions&quot;: dial tcp 127.0.0.1:8080: connect: connection refused\n\nFunction 'nodeinfo' failed to deploy with status code: 500\n<\/code><\/pre>\n<p>Aah! I bet it is because the OPENFAAS_URL is not set since I closed yesterday&#8217;s terminal session. Guess it is time I add this environment variable to my .zshrc. In my case it is actually &quot;~\/.ajzsh\/extras\/zshrc.ajzsh&quot; because I have my own zsh setup called <a href=\"https:\/\/github.com\/andrejacobs\/ajzsh\">ajzsh<\/a><\/p>\n<p>Relaunch the terminal and verify<\/p>\n<pre><code class=\"language-bash\">$ echo $OPENFAAS_URL\nhttp:\/\/192.168.64.4:8080\n<\/code><\/pre>\n<p>Profit!<\/p>\n<pre><code class=\"language-bash\">$ faas-cli store deploy NodeInfo\nWARNING! You are not using an encrypted connection to the gateway, consider using HTTPS.\n\nDeployed. 200 OK.\nURL: http:\/\/192.168.64.4:8080\/function\/nodeinfo\n\n$ echo &quot;&quot; | faas-cli invoke nodeinfo\nHostname: localhost\n\nArch: x64\nCPUs: 2\nTotal mem: 1988MB\nPlatform: linux\nUptime: 16999\n<\/code><\/pre>\n<p><strong>Learning action point:<\/strong> How do I setup TLS on the <code>faasd<\/code> gateway?<\/p>\n<h2>Helpful faas-cli commands<\/h2>\n<ul>\n<li>Get more information about a function from the store before installing it.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ faas-cli store describe NAME_OF_FUNCTION -v\n<\/code><\/pre>\n<ul>\n<li>Get more information about a deployed function.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ faas-cli describe nodeinfo\nName:                nodeinfo\nStatus:              Ready\nReplicas:            1\nAvailable replicas:  1\nInvocations:         2\nImage:\nFunction process:    node index.js\nURL:                 http:\/\/192.168.64.4:8080\/function\/nodeinfo\nAsync URL:           http:\/\/192.168.64.4:8080\/async-function\/nodeinfo\nLabels:Annotations:%\n<\/code><\/pre>\n<p>Note that the store name was &quot;NodeInfo&quot; but the function to invoke is &quot;nodeinfo&quot;. You will get an error if you tried to invoke using the &quot;NodeInfo&quot; name.<\/p>\n<p>Also to note the Invocations number is how many times the function has been called.<\/p>\n<ul>\n<li>Delete a function<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ faas-cli remove NAME_OF_FUNCTION\n<\/code><\/pre>\n<h2>Accessing the OpenFaaS gateway as a REST API<\/h2>\n<p>I learned about this useful cli tool name <a href=\"https:\/\/stedolan.github.io\/jq\/\">jq<\/a> from <a href=\"https:\/\/gumroad.com\/l\/serverless-for-everyone-else\">Serverless for Everyone Else<\/a> (the book and workshop I am following at the moment for learning about OpenFaaS etc.)<\/p>\n<p>Install <code>jq<\/code><\/p>\n<pre><code class=\"language-bash\">$ brew info jq\njq: stable 1.6 (bottled), HEAD\nLightweight and flexible command-line JSON processor\nhttps:\/\/stedolan.github.io\/jq\/\n\n$ brew install jq\n\n$ echo '{ &quot;name&quot; : &quot;Andre&quot; }' | jq\n{\n  &quot;name&quot;: &quot;Andre&quot;\n}\n<\/code><\/pre>\n<p>Get info about a deployed function as JSON response (note: jq is here just used to prettify the output)<\/p>\n<pre><code class=\"language-bash\">export PASSWORD=&quot;Insert the value you got earlier for faasd admin user&quot;\nexport HOST=&quot;192.168.64.4:8080&quot;\ncurl -s http:\/\/admin:$PASSWORD@$HOST\/system\/function\/nodeinfo | jq\n<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/andrejacobs.org\/wp-content\/uploads\/2021\/03\/20210310_Day2_1.png\" alt=\"\"><\/p>\n<h2>Building my first OpenFaaS function<\/h2>\n<p>To get a list of templates to start from<\/p>\n<pre><code class=\"language-bash\">$ faas-cli template store list\n...\npython3                  openfaas           Classic Python 3.6 template\npython3-http             openfaas           Python 3.7 with Flask and HTTP\n...\nswift                    affix              Swift 4.2 Template\n...\n<\/code><\/pre>\n<p>To get more information about a template<\/p>\n<pre><code class=\"language-bash\">$ faas-cli template store describe python3\n\nName:              python3\nPlatform:          x86_64\nLanguage:          Python\nSource:            openfaas\nDescription:       Classic Python 3.6 template\nRepository:        https:\/\/github.com\/openfaas\/templates\nOfficial Template: true\n<\/code><\/pre>\n<p>I will be deploying my function container to Docker Hub (turns out I already had an account on there). Set the Docker Hub prefix to use.<\/p>\n<pre><code class=\"language-bash\">export OPENFAAS_PREFIX=DOCKER_USER_NAME\n<\/code><\/pre>\n<p>Create the new function from the python3 template<\/p>\n<pre><code class=\"language-bash\">\u256d ~\/Learning\/faasd\/helloworld                                                            [20:23:45]\n\u2570 $ faas-cli new --lang python3 helloworld\n<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/andrejacobs.org\/wp-content\/uploads\/2021\/03\/20210310_Day2_2.png\" alt=\"\"><\/p>\n<p>Inside the directory where helloworld.yml lives I will try and build the docker image.<\/p>\n<pre><code class=\"language-bash\">\u256d ~\/Learning\/faasd\/helloworld                                                            [20:33:56]\n\u2570 $ faas-cli up -f helloworld.yml\n...\nErrors received during build:\n- [helloworld] received non-zero exit code from build, error: Cannot connect to the Docker daemon at unix:\/\/\/var\/run\/docker.sock. Is the docker daemon running?\n<\/code><\/pre>\n<p>Error, mmkay. I do have docker installed (Docker Desktop on Mac)<\/p>\n<p><a href=\"https:\/\/blog.alexellis.io\/\">Alex<\/a> mentions in his book that you will need to setup <code>docker login<\/code><\/p>\n<pre><code class=\"language-bash\">$ docker login\nLogin with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https:\/\/hub.docker.com to create one.\nUsername: [redacted]\nPassword:\nLogin Succeeded\n<\/code><\/pre>\n<p>Try again, same error. Aah ok I should maybe just actually read the error message. Turns out I forgot to start Docker.<\/p>\n<pre><code class=\"language-bash\">$ faas-cli up -f helloworld.yml\n...\nlots of bleep bloop\n...\nDeployed. 200 OK.\nURL: http:\/\/192.168.64.4:8080\/function\/helloworld.openfaas-fn\n<\/code><\/pre>\n<p>This worked indeed! I also checked Docker Hub and a new image is under my account.<\/p>\n<p>Check the function is deployed and what the calling name is.<\/p>\n<pre><code class=\"language-bash\">$ faas-cli list\nFunction                      \tInvocations    \tReplicas\ncows                          \t2              \t1\nhelloworld                    \t0              \t1\nnodeinfo                      \t4              \t1\n<\/code><\/pre>\n<p>Invoke it (note: the python3 template just echoes back what it is given as input)<\/p>\n<pre><code class=\"language-bash\">$ echo &quot;Hello World! (said the echo in the void)&quot; | faas-cli invoke helloworld\nHello World! (said the echo in the void)\n<\/code><\/pre>\n<p>Super profit for today!<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Photo by James Harrison on Unsplash Here is my\u00a0Log book [&#8230;]<\/p>\n<p><a class=\"understrap-read-more-link\" href=\"https:\/\/andrejacobs.org\/100-days-challenge\/100-days-of-learning-day-2-deploying-my-first-python-based-function\/\">Read more &rarr;<\/a><\/p>\n","protected":false},"author":2,"featured_media":215,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[37],"tags":[36],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>100 Days of Learning: Day 2 \u2013 Deploying my first Python based function - Andr\u00e9 Jacobs<\/title>\n<meta name=\"description\" content=\"Day 2 of 100 learning. 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