ansible-cluster

An example configuration for a web app using several servers

I arbitrarily assume that your ansible_host file is located in the same directory and is named ansible_host. Feel free to adjust to your settings

ATTENTION

I have included sample ssh keys. These are not intended to be used in real. Delete them and the setup.sh will automatically generate new unique keys for you.

First init phase

ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook site.yml -i ansible_host -t init

This step will setup your vms in a way that you can directly ssh into them because this is the basic requirement for ansible to work.

SSH encountered an unknown error during the connection maybe wrong fingerprint in known_hosts

Start

ansible-playbook site.yml -i ansible_host --skip-tags=init --forks=1

Available Tags

• init
• setup_db (installs PostgreSQL and repmgr)
• setup_db_cluster (sets up master and slave configuration)
• setup_web (installs nginx & composer)
• setup_load_balancer
• install_app (initial installation of the web application)
• update_app (updates the web application to the latest version)

Before start

• add the public key of the machine from where you run ansible to group_vars/all

Known issues

• add -f 1 when running multiple (vagrant) machines on one host. Otherwise apt-get often exits with an error during update or install

TODO

• find a reliable way for adding a key to known_hosts only once