By Michal Hantl
Hi, I deployed my app to droplet with rails, postgre, docker and dokku.
All was running smoothly, until I restarted the server today and I got into two problems:
-
One rails app said it was already running. The app said, there was /app/tmp/pids/server.pid file but I couldn’t find the server.pid file in the image though using
find / | grep 'server.pid' -
Other app couldn’t connect to the postgres, which after an inspection shows that is running on a different port. I tried re-deploying, re-establishing the postgre link through dokku and nothing happened, same error.
Eventually, I restarted the app2 with bad postgre through docker, that made things even worse and I have now two apps that won’t start.
Also I am trying to figure out why the hell I have unnamed images which seem to contain the Rails app and database, even tried to erased them and start fresh, but the deeper I dig, the more weird problems I get.
For instance removing the image says a different image is not there:
root@michal-do:~# docker rmi 44ce0ececdb4
Error response from daemon: No such id: ed09b33bb766f286542a2e7b7a71333bfff409f7bac78e42cf35302e29982a24
2014/10/07 09:10:40 Error: failed to remove one or more images
root@michal-do:~# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
<none> <none> 44ce0ececdb4 24 minutes ago 1.264 GB
dokku/fulcrum latest c10d700243b2 4 hours ago 1.242 GB
<none> <none> cc27ac49e4a6 4 hours ago 1.264 GB
postgresql/fondio latest fdf7f34be819 5 hours ago 310.5 MB
postgresql/fulcrum latest dbc9d1eb0ced 7 weeks ago 310.5 MB
<none> <none> cca64120d443 7 weeks ago 310.5 MB
kloadut/postgresql latest 9ed9651b7b98 7 weeks ago 310.5 MB
ubuntu trusty c4ff7513909d 8 weeks ago 225.4 MB
progrium/buildstep latest cbac8f84e925 11 weeks ago 1.151 GB
ubuntu 14.04 e54ca5efa2e9 3 months ago 276.5 MB
I seem to run into some newbie stuff I can’t even google answers for so any help is greatly appreciated.
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I had a similar issue where I got 502 bad gateway error after powering off droplet and back on. I was able to easily fix it by ssh into droplet, and run: dokku ps:rebuildall See my answer (lacostenycoder) at: https://stackoverflow.com/questions/21056911/error-502-bad-gateway-on-nginx-rails-dokku and up-vote if it helps!
Dokku can be a great way to deploy apps because it hides a lot of complexities. Though when it breaks down, that same quality can be quite frustrating. Hopefully, I can help point you in the right direction.
The way Dokku itself restarts apps after a change is by issuing:
dokku release myapp
dokku deploy myapp
This blog post deals with problems relinking apps to postgres after a reboot, and suggests creating this script to help:
#!/bin/bash
APP="$1";
CURRENT_URL=`dokku config:get $APP DATABASE_URL`
dokku postgresql:create $APP
ID=$(docker ps -a | grep "postgresql/$APP":latest | awk '{print $1}')
IP=$(docker inspect $ID | grep IPAddress | awk '{ print $2 }' | tr -d ',"')
NEW_URL=$(echo $CURRENT_URL | sed -e "s/@.*\//@$IP\//g")
dokku config:set $APP DATABASE_URL=$NEW_URL
Let us know if that gets you any further.
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