Running commands within application

[hieronx]

Running commands within applications, like rake db:migrate for Ruby on Rails applications, doesn't seem to be possible.

I tried opening a console like this:

docker run -i -t app/name /bin/bash

And running:

cd app && RAILS_ENV=production rake db:migrate

But then I'm getting the following error:

Could not find rake-10.1.0 in any of the sources
Run `bundle install` to install missing gems.

Am I missing something here? Thanks for any help!

[ivey]

I wasn't able to find the right way into the bundled gems either, and I didn't have time to dig too much today, so I added:

task "assets:precompile" => "db:migrate"

to Rakefile so it would migrate on every deploy.

[ivey]

The magic is in /start ... after you connect, copy-paste the first 4 lines:

export HOME=/app
for file in /app/.profile.d/*; do source $file; done
hash -r
cd /app

And you can do whatever you need.

[progrium]

Yes, seems like maybe that should be pulled out into a separate script ...
maybe even create a custom entry point for the image that loads that stuff.
Anyway, it would be fixed in buildstep, not Dokku.

On Thu, Aug 8, 2013 at 8:20 AM, Michael D. Ivey notifications@github.comwrote:

The magic is in /start ... after you connect, copy-paste the first 4
lines:

export HOME=/app
for file in /app/.profile.d/*; do source $file; done
hash -r
cd /app

And you can do whatever you need.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/156#issuecomment-22330945
.

Jeff Lindsay
http://progrium.com

[caarlos0]

I believe that running db:migrate in assets:precompile task will now work, because the DATABASE_URL is not exported yet...

see #165

[asm89]

ping @offerijns @ivey @bradleyg Can you guys give #180 a try? You need to update your buildstep install to the PR mentioned there (pull my branch an run "make build").

[asm89]

@offerijns @ivey @bradleyg I just merged support for dokku run <app> <cmd>. Can you check it out? :)

[luxifer]

nice one

[abstractcoder]

currently dokku run <app> <cmd> doesn't seem to do anything. I initially installed dokku a few weeks ago and have updated it twice since then.

I still have to use the docker run -i -t app/name /bin/bash work around.

[plietar]

@abstractcoder Can you try to create a /home/dokku/dokkurc containing

export DOKKU_TRACE=1

And post the full output you get when running dokku run. You'll need to update to the latest version of dokku, as support for tracing was added yesterday (well mostly). Make sure you run make install as upgrading pluginhook is required.

[abstractcoder]

@plietar Here is the output:

+ case "$1" in
+ pluginhook commands run www rake db:migrate
+ cat
+ case "$1" in
+ case "$1" in
+ cat
+ [[ -z www ]]
+ [[ run == config ]]
+ APP=www
+ IMAGE=app/www
+ [[ run == config:* ]]
+ [[ ! -d /home/dokku/www ]]
+ shift 2
+ docker run -i -t app/www /exec rake db:migrate
+ case "$1" in
+ cat
+ cat

It may actually be working but I'm not getting any output.

[plietar]

What about running docker run -i -t app/www /exec rake db:migrate directly ?
Or run docker run -i -t app/www /bin/bash first, and then rake db:migrate.

[plietar]

Also do other commands implemented in plugins give you an output ?
Try dokku url www for example.

[abstractcoder]

Running dokku url www gives me output.

Since I no longer have any migrations to run I switched to testing dokku run www rake db:migrate:status, which doesnt output anything (except the trace when the DOKKU_TRACE flag is set), but running docker run -i -t app/www /exec rake db:migrate:status does give me the appropriate output.

[plietar]

What about a simple dokku run www echo "Hello"

[abstractcoder]

No output when running dokku run www echo "Hello"

[plietar]

I just went back to master, and I can reproduce the problem. I'll have a look at it. Seems like a strange pluginhook/pty related error.
Can you open a dedicated issue ?

[abstractcoder]

I opened #323

[sangyongjung]

https://www.digitalocean.com/community/tutorials/how-to-use-the-dokku-one-click-digitalocean-image-to-run-a-ruby-on-rails-app

dokku run app_name rake db:migrate

suddenly worked for me. (I used the work around mentioned above until now.)
Anyone else any luck?