Ansible¶

Installation¶

sudo pip3 install ansible

Configuration file structure¶

ANSIBLE_CONFIG (env variable)
./ansible.cfg (An ansible.cfg file, in the current directory) -- PREFERED WAY --
~/.ansible.cfg (Hidden file in the home directory)
/etc/ansible/ansible.cfg

Register Ansible hosts¶

Manual¶

Configuring SSH connectivity between hosts

Generate ssh-keygen¶

ssh-keygen

Copy public key to hosts (manual way)¶

ssh-copy-id -o StrictHostKeyChecking=no ansible@host1
ssh-copy-id -o StrictHostKeyChecking=no ansible@host2
ssh-copy-id -o StrictHostKeyChecking=no ansible@host3
ssh-copy-id -o StrictHostKeyChecking=no ansible@server1
ssh-copy-id -o StrictHostKeyChecking=no ansible@server2
ssh-copy-id -o StrictHostKeyChecking=no ansible@server3

Automated way¶

Install Package¶

sudo apt update
sudo apt install sshpass

Create password file¶

echo "password" > password.txt

Run script to register sshkey into hosts and servers (ansible and root user)¶

for user in ansible root
do
    for os in host server
    do
        for instance in 1 2 3
        do
            sshpass -f password.txt ssh-copy-id -o StrictHostKeyChecking=no ${user}@${os}${instance}
        done
    done
done

Check if hosts are up and config is valid¶

ansible -i,host1,host2,host3,server1,server2,server3 all -m ping

Commands¶

Ping all hosts / groups

ansible all -m ping

ansible '*' -m ping

- Ping specific group

ansible hostgroup -m ping

ansible servergroup -m ping

Better interface (add -o in the end)
```
ansible '*' -m ping -o
```
List hosts
```
ansible all --list-hosts -o
```

Overwrite variable

ansible all -m ping -e 'ansible_port=2222' -o