add new post about automated deployment
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%{
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title: "Elixir Phoenix Automated Deployment with Gitea/systemd",
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id: "elixir-phoenix-automated-deployment-gitea-systemd-git",
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date: ~N[2021-04-08 17:49:00],
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author: "Adam Piontek",
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tags: ~w(tech elixir phoenix notes coding automated deployment gitea git systemd)
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}
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---
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I don't know if this is the *"right"* way to do this, but it's working for me at the moment, and since it took a bit to figure out, I figured I'd write up my notes.
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My needs are simple: when I'm happy with an update to my blog, or another elixir phoenix app I run, Shift73k (or more in the future), I'd like to be able to just commit to my repository, and then have those changes go live. At the moment I run both gitea and my other little apps on the same Linode, so I was able to set it up like this:
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<!--more-->
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### deployment script
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First, the Phoenix deployment makes use of [Releases](https://hexdocs.pm/phoenix/releases.html), though I'm not doing anything fancy to track versions or anything like that.
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This means the general upload procedure looks like this, and I can put it in a bash script to make updating a bit easier:
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```bash
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#!/usr/bin/env bash
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cd /opt/myapp73k
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# update from master
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/usr/bin/git pull 73k master
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# fetch prod deps & compile
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/usr/bin/mix deps.get --only prod
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MIX_ENV=prod /usr/bin/mix compile
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# perform any migrations
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MIX_ENV=prod /usr/bin/mix ecto.migrate
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# update node packages via package-lock.json
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/usr/bin/npm --prefix /opt/myapp73k/assets/ ci
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# rebuild static assets:
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rm -rf /opt/myapp73k/priv/static/*
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/usr/bin/npm --prefix /opt/myapp73k/assets/ run deploy
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MIX_ENV=prod /usr/bin/mix phx.digest
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# rebuild release
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MIX_ENV=prod /usr/bin/mix release --overwrite
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# restart service
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sudo /bin/systemctl restart myapp73k.service
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```
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### sudo permissions
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To allow the user that's running the script to invoke `sudo` we need to give it explicit permission, e.g. by placing the following in a file like `/etc/sudoers.d/deploy_hooks`:
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```bash
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git ALL=(runuser) NOPASSWD: /home/runuser/deploy_hooks/deploy-myapp73k.sh
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runuser ALL= NOPASSWD: /bin/systemctl restart myapp73k.service
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```
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The first line allows the user `git` to run the script `/home/runuser/deploy_hooks/deploy-myapp73k.sh` *as the user* with username `runuser` -- and without requiring a password. Permissions should only allow the `runuser` accoutn to modify the script, so someone with access to the `git` account can't modify it to make it run something else.
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The second line allows the user `runuser` to run *only* the command `/bin/systemctl restart myapp73k.service` without a password. Doing anything else with sudo will still ask for a password.
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What this enables is that a git post-receive hook, running as user `git`, can call the deploy script, which runs as user `runuser` and performs the app update, which can finish by calling `systemctl restart`{:.lang-bash}
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### gitea post-receive hook content
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For git to run the deployment script after the repository receives a new commit, we set a git hook. But I want to be able to commit development branches to the repository without those commits getting deployed, so I want the hook to do nothing unless it's a commit to the master branch (could be any other branch, say "prod")
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My hook looks something like this:
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```bash
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#!/usr/bin/env bash
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while read oldrev newrev refname
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do
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branch=$(git rev-parse --symbolic --abbrev-ref $refname)
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if [ "master" = "$branch" ]; then
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sudo -u runuser /home/runuser/deploy_hooks/deploy-myapp73k.sh
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fi
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done
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```
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Here we can see the hook checks the branch first, and if master, runs `sudo -u runuser`{:.lang-bash} to run the script as user `runuser`
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### elixir phoenix release systemd unit
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That should just about do it, but as an extra note, here's the elixir phoenix release systemd unit:
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```systemd
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[Unit]
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Description=MyApp73k service
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After=local-fs.target network.target
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[Service]
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Type=simple
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User=runuser
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Group=runuser
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WorkingDirectory=/opt/myapp/_build/prod/rel/myapp73k
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ExecStart=/opt/myapp73k/_build/prod/rel/myapp73k/bin/myapp73k start
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ExecStop=/opt/myapp73k/_build/prod/rel/myapp73k/bin/myapp73k stop
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#EnvironmentFile=/etc/default/myApp.env
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Environment=LANG=en_US.utf8
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Environment=MIX_ENV=prod
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Environment=PORT=4000
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LimitNOFILE=65535
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UMask=0027
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SyslogIdentifier=myapp73k
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Restart=always
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[Install]
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WantedBy=multi-user.target
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```
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I hope this is helpful to someone --- most of all my future self!
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