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How to Install and Configure ‘Ansible’ on CentOS 7

Ansible is a tool that used to manage various nodes from an ansible installed Controlling Machine using SSH Protocol. It makes every system administrative tasks more easy.

Ansible System (Controlling Machine):-

IP: 10.0.0.209

Nodes IP:-

10.0.0.206
10.0.0.207

Lets start–

Step 1:-
Ensure that the repository is added in the Controlling Machine or you may need to install it.

Ensure that the repository is added in the Controlling Machine or you may need to install it.

# yum install epel-release -y

Step 2:-
1. Install Ansible using yum in Controlling Machine.

# yum install ansible

2. Check the version of the installed Ansible

# ansible --version

Step 3:-
Setup your Controlling Machine to connect node using SSH protocol.

1. Create ssh key to access node systems.

# ssh-keygen

2. Copy the key to the node systems.

# ssh-copy-id root@10.0.0.206
# ssh-copy-id root@10.0.0.207

Step 4:
Add ips of node systems into the Inventory of Ansible by editing /etc/ansible/hosts .

# vim /etc/ansible/hosts
[ansi-test]
10.0.0.206
10.0.0.207

Note: Here both ip can call using the name “ansi-test”.

Step 5:-
Test Ansible in the Controlling Machine by using below commands.

1. First of all test the Controlling Machine have ping with node system using ansible commands.

# ansible -m ping all

10.0.0.206 | SUCCESS => {
    "changed": false,
    "ping": "pong"
}
10.0.0.207 | SUCCESS => {
    "changed": false,
    "ping": "pong"
}

2. Execute any command in Controlling Machine.

# ansible -m command -a "df -h" ansi-test
10.0.0.206 | SUCCESS | rc=0 >>
Filesystem               Size  Used Avail Use% Mounted on
default/containers/test1 437G  3.4G  433G   1% /
none                     492K     0  492K   0% /dev
udev                     3.8G     0  3.8G   0% /dev/tty
tmpfs                    100K     0  100K   0% /dev/lxd
tmpfs                    100K     0  100K   0% /dev/.lxd-mounts
tmpfs                    3.9G  120K  3.9G   1% /dev/shm
tmpfs                    3.9G   17M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs                    784M     0  784M   0% /run/user/0

10.0.0.207 | SUCCESS | rc=0 >>
Filesystem                 Size  Used Avail Use% Mounted on
default/containers/test2   436G  2.6G  433G   1% /
none                       492K     0  492K   0% /dev
udev                       3.8G     0  3.8G   0% /dev/tty
tmpfs                      100K     0  100K   0% /dev/lxd
tmpfs                      100K     0  100K   0% /dev/.lxd-mounts
tmpfs                      3.9G     0  3.9G   0% /dev/shm
tmpfs                      3.9G   17M  3.9G   1% /run
tmpfs                      3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs                      784M     0  784M   0% /run/user/0

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