Install and use the automation tools in CentOS 7 Ansible

Ansible is a free, open source configuration and Automation tool developed for UNIX-like systems. It's written in Python, similar to chef and puppet, but there's a difference and the advantage is that we don't need to install any clients in the node. It uses SSH to communicate with the node.

In this article we will install and configure ansible on CentOS 7 and try to manage two nodes.

Ansible Server –ansible.linuxtechi.com (192.168.1.15)

Node –192.168.1.9, 192.168.1.10

First step: Set up the Epel warehouse

The Ansible warehouse is not in the Yum repository by default, so we need to enable the Epel warehouse using the following command.

[Email protected] ~]# RPM-IUVH http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

Step two: Install Ansible with Yum

[email protected] ~]# Yum install ansible

After the installation is complete, check the ansible version:

[Email protected] ~]# ansible--version

Step three: Set up SSH keys for node authentication

Generate the key on the Ansible server and copy the public key into the node.

[Email protected] ~]# Ssh-keygen

Use the Ssh-copy-id command to replicate the Ansible public key into the node.

Fourth step: Define a list of nodes for Ansible

File/etc/ansible/hosts maintains a list of servers in Ansible.

[Email protected] ~]# vi/etc/ansible/hosts

[Test-servers]

192.168.1.9

192.168.1.10

Save and exit the file.

Fifth step: Try running the command on the ansible server

Use ping to check the connectivity of the ' test-servers ' or ansible nodes.

[[email protected] ~]# ansible-m ping ' test-servers '

Execute shell command

1: Check the run time of the Ansible node (uptime)

[Email protected] ~]# ansible-m command-a "uptime" ' test-servers '

2 : Check the kernel version of the node

[Email protected] ~]# ansible-m command-a "uname-r" ' test-servers '

3 : Add user to Node

[Email protected] ~]# ansible-m command-a "useradd mark" ' Test-servers '

[[email protected] ~]# ansible-m command-a "grep mark/etc/passwd" ' Test-servers '

4 : Redirect output to file

[Email protected] ~]# ansible-m command-a "df-th" ' test-servers ' >/tmp/command-output.txt

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Install and use the automation tools in CentOS 7 Ansible