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792da067e3
When I woke up this morning, the app had crashed because the mysql connection was closed! I'm not sure, why that caused a _crash_? Or why pm2 didn't pick up on it, and said the process was still online? (Maybe the process was running, but the server had stopped?) Those could be good to investigate?… …but better than diving too far into the details, is to just address the high-level problem: if the app goes down for unexpected reasons, I want it back up!! lol In this change, we add `monit`, a solid system for monitoring processes (including checking for behavior, like responding to net requests), and configure it to watch the app process and the nginx process. To test, you can run `pm2 stop impress-2020`, or `systemctl stop nginx`, to see that Monit brings them back up within seconds! This does add some potential surprise if you're _trying_ to take the processes down. The easiest way is to send the stop command through monit, like `monit stop nginx`. This will disable monitoring until you start it again through monit, I think? (You can also disable/enable monitoring as a direct command, regardless of app state.) |
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Impress 2020 is deployed to a VPS server. We use this Ansible Playbook to automate the environment setup! We expect to be deploying to Ubuntu 20.04 LTS, initially with nothing installed. The user you deploy with should have sudoers access. That should be all it takes! First, run `yarn deploy-setup` in the app root, to run the `setup.yml` playbook. This will prompt you for your root password, to set up system dependencies. It should be safe to re-run this, including if you add a new dependency to the playbook, because the steps are non-destructive and Ansible will skip steps that are already satisfied. Then, to deploy a new version of the app, run `yarn deploy`. This will build the app from the code on your machine, then send the source and build output to the remote machine, and switch it to be the new production version. Nice!