1. Install Ansible

MacOS: brew install ansible

2. Put Server IP or DNS you want to set up in ./hosts

Create the ./hosts and add server ip or dns to it. You can find an example in ./host.example. You can also put multiple server ip or DNS in the ./host file line by line.

3. Exeute the command with your private key

ansible-playbook -i ./hosts playbook/docker.yml -u ubuntu --private-key=<...>/msj.pem

4. (Opational) Disable ssh key check

Setting up new servers will trigger ssh key checking as bellow:

GATHERING FACTS ***************************************************************
The authenticity of host 'xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx)' can't be established.
RSA key fingerprint is xx:yy:zz:....
Are you sure you want to continue connecting (yes/no)?

It may cause the command failed if you have multiple server to set up. You can make ~/.ansible.cfg, and include this:

[defaults]
host_key_checking = False