Using Dockerfiles¶

Deis supports deploying applications via Dockerfiles. A Dockerfile automates the steps for crafting a Docker Image. Dockerfiles are incredibly powerful but require some extra work to define your exact application runtime environment.

Prepare an Application¶

If you do not have an existing application, you can clone an example application that demonstrates the Dockerfile workflow.

$ git clone https://github.com/deis/helloworld.git
$ cd helloworld

Dockerfile Requirements¶

In order to deploy Dockerfile applications, they must conform to the following requirements:

The Dockerfile must EXPOSE only one port

The port must be listening for a HTTP connection

A default CMD must be specified for running the container

Note

Dockerfiles which expose more than one port will hit issue 1156.

Create an Application¶

Use deis create to create an application on the Controller.

$ deis create
Creating application... done, created folksy-offshoot
Git remote deis added

Push to Deploy¶

Use git push deis master to deploy your application.

$ git push deis master
Counting objects: 13, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (13/13), done.
Writing objects: 100% (13/13), 1.99 KiB | 0 bytes/s, done.
Total 13 (delta 2), reused 0 (delta 0)
-----> Building Docker image
Uploading context 4.096 kB
Uploading context
Step 0 : FROM deis/base:latest
 ---> 60024338bc63
Step 1 : RUN wget -O /tmp/go1.2.1.linux-amd64.tar.gz -q https://go.googlecode.com/files/go1.2.1.linux-amd64.tar.gz
 ---> Using cache
 ---> cf9ef8c5caa7
Step 2 : RUN tar -C /usr/local -xzf /tmp/go1.2.1.linux-amd64.tar.gz
 ---> Using cache
 ---> 515b1faf3bd8
Step 3 : RUN mkdir -p /go
 ---> Using cache
 ---> ebf4927a00e9
Step 4 : ENV GOPATH /go
 ---> Using cache
 ---> c6a276eded37
Step 5 : ENV PATH /usr/local/go/bin:/go/bin:$PATH
 ---> Using cache
 ---> 2ba6f6c9f108
Step 6 : ADD . /go/src/github.com/deis/helloworld
 ---> 94ab7f4b977b
Removing intermediate container 171b7d9fdb34
Step 7 : RUN cd /go/src/github.com/deis/helloworld && go install -v .
 ---> Running in 0c8fbb2d2812
github.com/deis/helloworld
 ---> 13b5af931393
Removing intermediate container 0c8fbb2d2812
Step 8 : ENV PORT 80
 ---> Running in 9b07da36a272
 ---> 2dce83167874
Removing intermediate container 9b07da36a272
Step 9 : CMD ["/go/bin/helloworld"]
 ---> Running in f7b215199940
 ---> b1e55ce5195a
Removing intermediate container f7b215199940
Step 10 : EXPOSE 80
 ---> Running in 7eb8ec45dcb0
 ---> ea1a8cc93ca3
Removing intermediate container 7eb8ec45dcb0
Successfully built ea1a8cc93ca3
-----> Pushing image to private registry

       Launching... done, v2

-----> folksy-offshoot deployed to Deis
       http://folksy-offshoot.local3.deisapp.com

       To learn more, use `deis help` or visit http://deis.io

To ssh://git@local3.deisapp.com:2222/folksy-offshoot.git
 * [new branch]      master -> master

$ curl -s http://folksy-offshoot.local3.deisapp.com
Welcome to Deis!
See the documentation at http://docs.deis.io/ for more information.

Because a Dockerfile application is detected, the cmd process type is automatically scaled to 1 on first deploy.

Use deis scale cmd=3 to increase cmd processes to 3, for example. Scaling a process type directly changes the number of Containers running that process.