Varnish will make of the following environment variables.
VARNISH_BACKEND_PORT 80
VARNISH_BACKEND_IP 172.17.42.1
VARNISH_PORT 80
The pre built image can be downloaded using docker directly. After that you do not need to use this command again, you will have the image on your machine.
$ sudo docker pull jacksoncage/varnish
If you prefer you can easily build the docker image by yourself. After this the image is ready for use on your machine and can be used for multiple starts.
$ cd varnish-docker
$ sudo docker build -t jacksoncage/varnish .
The container has all pre requisites set up to run any varnish application. Specify all needed environment variables.
$ sudo docker run -i -d -p 80 -e VARNISH_BACKEND_PORT=8080 jacksoncage/varnish
The command above starts the container in deamon mode (-d) and runs in the background. If you want to start it by yourself just to see what happens use this command:
$ sudo docker run -i -t -p 80 -e VARNISH_BACKEND_PORT=8080 jacksoncage/varnish bash
Notice the two changes made here, first we replaced the deamon switch (-d) with the tty switch (-t) which pipes the std in and std out to your terminal.
You now end up as a root user in the docker container and can do simple things like ls, cd and more. More complex things can be achieved after a apt-get install of one or more software(s) of choice.
The first command inspects your created container and get the IPv4 address. Second command docker exported port for 8080.
$ sudo docker inspect <container_id> | grep IPAddress | cut -d '"' -f 4
$ sudo docker port <container_id> 80 | cut -d ":" -f2
Now go to <your container's ip>:<container's port> in your browser
Stopping a running container is possible via the docker api. If only one instance of this container is running this command will stop it:
$ sudo docker stop `sudo docker ps |grep jacksoncage/varnish |cut -d\ -f1`