Docker meets Vagrant (registry-less mode)
Docker meets Vagrant (registry-less mode)
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Ok, I have Vagrant installed on my system and I need to install ActiveMQ into Vagrant box using Docker. Let's start with Vagrant file.
VAGRANTFILE_API_VERSION = "2" Vagrant.configure(VAGRANTFILE_API_VERSION) do |config| config.vm.box = "base" config.vm.network "forwarded_port", :guest => 8162, :host => 8162 config.vm.network "forwarded_port", :guest => 61616, :host => 61616 config.vm.provision "docker" end
Dockerfile -> (build) -> image > (run) -> container
- Image - it's actually a result of Dockerfile `build`. Image contains all files for next containers. You can use image as a parent for other images and you can pull and push images into repository.
- Container - when you `run` an image with specific command it creates new container. The command can be defined in Dockerfile or in command line.
apt-get update --fix-missing # first, update the system apt-get install -y software-properties-common python-software-properties #install add-apt-repository add-apt-repository -y ppa:webupd8team/java # add java apt-get update # one more update for java echo debconf shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections # agree to java license echo debconf shared/accepted-oracle-license-v1-1 seen true | sudo debconf-set-selections apt-get install -y oracle-java8-installer # install java cd /tmp #load ActiveMQ wget http://mirror.netcologne.de/apache.org/activemq/5.10.0/apache-activemq-5.10.0-bin.tar.gz tar -xvzf apache-activemq-5.10.0-bin.tar.gz mv apache-activemq-5.10.0 /var/lib/activemq
And also I've changed ActiveMQ web console port from 8161 to 8162 (because I'm crazzzy). And I'm able to run `/var/lib/activemq/bin/activemq console` inside that ubuntu container (it's not reachable from outside of container). Time to say `exit` for the container.
Few Dockers commands which might help:
- `docker images` - all downloaded images
- `docker rm <container hash/name>` - remove container
- `docker rmi <image hash>` - remove image
- `docker build <path to Dockerfile dir>` - build image from docker file
- `docker run <image name> <command>` - run container from image (every run runs new container)
- `docker start/stop/kill/attach <container hash/name>` - starts/stops/kills/attaches to container
`sick_torvalds` is autogenerated name for my bash container. And I'm deleting it `docker rm sick_torvalds` (thous names sounds horrible some times).
FROM ubuntu:latest RUN apt-get update --fix-missing RUN apt-get install -y software-properties-common python-software-properties RUN add-apt-repository -y ppa:webupd8team/java RUN apt-get update RUN echo debconf shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections RUN echo debconf shared/accepted-oracle-license-v1-1 seen true | sudo debconf-set-selections RUN apt-get install -y oracle-java8-installer RUN cd /tmp RUN wget http://mirror.netcologne.de/apache.org/activemq/5.10.0/apache-activemq-5.10.0-bin.tar.gz RUN tar -xvzf apache-activemq-5.10.0-bin.tar.gz RUN mv apache-activemq-5.10.0 /var/lib/activemq COPY jetty.xml /var/lib/activemq/conf/jetty.xml EXPOSE 61616 EXPOSE 8162 ENV ACTIVEMQ_OPTS_MEMORY -Xms300m -Xmx300m ENTRYPOINT /var/lib/activemq/bin/activemq console
Pretty same, right. I'm using `jetty.xml` to override web console port to 8162 (just an example here). So I need to put `jetty.xml` into `activemq` folder. Few words about Dockerfile notation:
- `RUN` - execute a shell command (docker will continue with execution in case of exception)
- `COPY` (or `ADD`) - copy from Dockerfile dir into image
- `EXPOSE` - make port accessible for other containers (but not from outside of Docker infrastructure)
- `VOLUME` - mount a Docker volume (see next article)
- `USER` - change to user (`root` is default for container)
- `ONBUILD` - execute only for child containers
- `ENTRYPOINT` - `command` or `['binary']` for execute. If you defined JSON array as argument than first element should be binary. If it's a command `/bin/sh -c <command>` will be executed.
- `CMD` - The default command for `docker`. If you are using ENTRYPOINT with binary you can define default arguments here. To be honest I don't get the difference between ENTRYPOINT and CMD fully and this might be wrong.
docker build -t myrepo/activemq /vagrant/activemq docker run -d -p 8162:8162 -p 61616:61616 --name activemq myrepo/activemq docker logs activemq # see the logs
`-p 8162:8162 -p 61616:61616` says that I want to map `host_port:container_port`. I'm also mapping thous ports in Vagrant, remember? Open http://localhost:8162/ on your Host. Should work.
The last modification in Vagrantfile to make activemq build and start on VM creating time. Replace `config.vm.provision "docker"` to:
VAGRANTFILE_API_VERSION = "2" Vagrant.configure(VAGRANTFILE_API_VERSION) do |config| config.vm.box = "base" config.vm.network "forwarded_port", :guest => 8162, :host => 8162 config.vm.network "forwarded_port", :guest => 61616, :host => 61616 config.vm.provision "docker" do |d| d.build_image "-t myrepo/activemq /vagrant/activemq" d.run "-d -p 8162:8162 -p 61616:61616 --name activemq myrepo/activemq" end end
Thank you for reading. Now you can easily automate developer machine preparation with Vagrant and Docker. The next step will be automation your staging env and (may be) delivery to production using Docker registry. Source on github.
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