We start with installing Ansible using root.
step 1 - run "yum install ansible" to install it on one machine with CenOS 7;
step 2 - configuring ansible hosts
Open the file /etc/ansible/hosts, in this file, add:
[servers] host1 [email protected]_ip host2 [email protected]_ip
We test ansible to connect to host1 and host2 using command:
ansible -m ping all
However, it failed and presented the error:
host1 | UNREACHABLE! => {
"changed": false,
"msg": "Failed to connect to the host via ssh: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).\r\n",
"unreachable": true
}
We addressed this problem by generating private and public keys on this server, and copying the public key to the server that ansible attempted to connect.
On local computer, generate a SSH key pair by the following command:
ssh-keygen
The key pair will be created within ~/.ssh directory.
The password can be neglected.
To copy the public key to the server, typing
ssh-copy-id [email protected]_host
To test the ssh connection, run
ssh [email protected]_host
After SSH key authentication is established, we come back to ansible and run
ansible -m ping all
Now we can see that
host1 | SUCCESS => {
"changed": false,
"ping": "pong"
}
Reference
https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-ansible-on-centos-7