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Demonstration

To demonstrate the use of the control machine, we will setup a few containers representing machines of particular roles. Each machine will be a simple Docker container which allows ssh access and is not appropriate for use outside of the demo environment.

To start, let's build the base image for use by each machine.

cd ansiblecm/demo/machine

docker build --tag machine .

The resulting Docker image is a CentOS 7 machine with a single user allowing ssh access. With the image, we will start a few web machines and one database machine.

docker run -d --rm -p 22 -p 8080:8080 --name web1 machine
docker run -d --rm -p 22 -p 8081:8080 --name web2 machine
docker run -d --rm -p 22 -p 8082:8080 --name web3 machine
docker run -d --rm -p 22 -p 27017:27017 --name db1 machine

Each web machine will be running a web server, but at this point, it is not installed as verified by browsing to their exposed host port on http://localhost:8080

The database machine will be running MongoDB, but at this point it is not installed yet as verified by browsing to its' exposed host port on http://localhost:27017

Now, let's update the ansiblecm/demo/playbook/inventory file with the virtual IPs of the 4 machines. To obtain the IP of each machine run the following:

docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' web1
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' web2
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' web3
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' db1

To demonstrate the use of an ansible one liner, let's install Java 8 on just the web machines. Depending on your network speed this could take 2 minutes or so. The install will prompt you for the password of the centos user which is simply centos.

docker run -it --rm --entrypoint ansible -v $PWD/demo/playbook:/tmp/playbook:Z jmal98/ansiblecm:9.4.0 web -m yum -a 'name=java-1.8.0-openjdk-headless state=present'  -i inventory/hosts -u centos -k -b

To prove that java was installed on the web machines, let's run below which should show the version of java installed on web1.

docker exec -it web1 java -version

Now, let's invoke the full playbook which will install the web server and MongoDB on the machines. Depending on your network speed this could take 5 minutes or so. Again, the execution of the playbook will prompt you for the password of the centos user which is centos.

docker run -it --rm -v $PWD/demo/playbook:/tmp/playbook:Z jmal98/ansiblecm:9.4.0 site.yml -i inventory/hosts -k

If all goes well the web machines will be running a web server, which is accessible via their exposed host ports.

Also, MongoDB should be up and it's status should be accessible via it's exposed host port http://localhost:27017

That's it. You just used the control machine to install a typical web stack with a NoSQL MongoDB database. Feel free to play around with the playbook and iterate changes on the machines.

When you're ready to shutdown the machines:

docker rm -fv web1 web2 web3 db1

Enjoy.