+1 to docker upgrade, in 1.8 they fixed annoying memory leak on log tail.
Currently it causes OOM to me.

@michaelshobbs can you give this a once over? I can't really fix the package-based installation without merging/building a 0.4.0 package, but it should work fine.

How do you install a specific version of docker?

You can't. And the new docker repo uses a new package name.

You absolutely can. It's inefficient but you can. I think we should allow for it like we did before with $DOCKER_VERSION.

$ curl -sSL https://get.docker.com/ | sh
$ dpkg -l | grep docker-engine
ii  docker-engine                       1.8.2-0~trusty                   amd64        Docker: the open-source application container engine
$ apt-cache madison docker-engine
docker-engine | 1.8.2-0~trusty | https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
docker-engine | 1.8.1-0~trusty | https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
docker-engine | 1.8.0-0~trusty | https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
docker-engine | 1.7.1-0~trusty | https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
docker-engine | 1.7.0-0~trusty | https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages
$ apt-get install docker-engine=1.7.0-0~trusty
$ dpkg -l | grep docker-engine
ii  docker-engine                       1.7.0-0~trusty                   amd64        Docker: the open-source application container engine

You want to peg us to a specific version?

I think we should, no? So we can say dokku core 0.4.0 + official plugins run on docker version x.y.z but you can override that version with $DOCKER_VERSION when installing?

Then upgrading docker would reinstall dokku if you install via deb package, no?

Can't we pin the deb dependency as well? I can take a swing at revising this PR if you want.

Sure, pin the dependency if you want. Can we leave it open to anything in the 1.8.x line?

Feel free to update the PR.

It doesn't look like it's possible just with apt-get. We'd have to script around a bit. My thinking is that pinning would make troubleshooting a bit easier. Maybe not though? We weren't pinned before the 1.7.x change... I could be convinced it's not that big of a deal. Thoughts?

I would still like to be able to specify a version. I'll update to allow that at least.

You can use apt-mark hold but then you won't get the patch updates.

👍

FYI, for anyone trying to install v0.3.26 currently, you just need to manually install herokuish 0.0.1 as follows before the dokku package will install properly
apt-get install herokuish=0.0.1

Sorry about that, there was a snafu in releasing 0.4.0. We should be all good now!