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18f.gsa.gov deployment details

Quick file overview:

  • 18f-site.conf - Our nginx config for the production and staging site. Not synced to version control automatically, but we'll try to keep them in sync.
  • fabfile.py - Fabric deployment script to start/stop/restart our webhook processes. Could be extended to deploy and sync our nginx config, and restart nginx.
  • hookshot.js - Tiny webhook app, runs a command when a branch is updated. Uses hookshot to do the heavy lifting. Daemonized on our server using forever.

Automatic deployment

On the staging and production server, this project uses Node and hookshot to receive GitHub post-receive webhooks and update the project.

Ideally, these webhooks just run forever and never need to be maintained!

But just in case, this project includes fabric tasks for easy remote stop/start/restart of the hook processes on the 18F website.

You will need:

  • authorized access to the 18F site server
  • an 18f-site entry in your $HOME/.ssh/config with the necessary credentials
  • to pip install fabric, and have your active python when running it be 2.X

With that, you can start, stop, and restart the staging and production hooks like so:

fab stop
fab start
fab restart

Provide --set env=production to any of those commands to apply it to the production hook.

Setting it up yourself

These instructions can be applied locally (for development) or on the server (for deployment).

Install the Node dependencies with:

npm install hookshot
npm install minimist
npm install -g forever

18F's web server uses the hookshot command to listen for hooks on either of two ports.

From /deploy, run the hook with the appropriate port and command. It can be helpful to have forever and your command both log to the same file.

In development, you might use:

forever start -l $HOME/hookshot.log -a deploy/hookshot.js -p 3000 -b your-branch -c "cd $HOME/18f/18f.gsa.gov && git pull && bundle exec jekyll build >> $HOME/hookshot.log"

You can stop and restart your hooks by supplying the same arguments you gave.

forever stop deploy/hookshot.js -p 3000 -b your-branch -c "cd $HOME/18f/18f.gsa.gov && git pull && bundle exec jekyll build >> $HOME/hookshot.log"
forever restart deploy/hookshot.js -p 3000 -b your-branch -c "cd $HOME/18f/18f.gsa.gov && git pull && bundle exec jekyll build >> $HOME/hookshot.log"

On our web server, 18F runs two separate hooks.

You may wish to use ngrok or localtunnel in development, to test out the webhook.