4 - Ansible common modules Part 2

1. Overview
   At this post we will reveal below ansible modules and get them on practice with examples
   

   command	copy	file
   user	group	service
   script

   
   
   
   
   
   
2. Ansible module - user
   

   [root@shell-master ~]# ansible-doc -s user
   - name: Manage user accounts

   Example: Create new user
   Run below command to create user wayne02

   [root@shell-master ~]# ansible webservers -m user -a "name=wayne02 home=/home/wayne02 shell=/bin/bash"

   

   After the command finished, switch to shell-node1, checking if the user created:
   

3. Ansible module - group
   

   [root@shell-master ~]# ansible-doc -s group
   - name: Add or remove groups

   Example: Add new group
   Run below command to create new group testing-group

   [root@shell-master ~]# ansible webservers -m group -a "name=testing-group state=present"

   

    Switch back to shell-node1, verify if the group been created
   

4. Ansible module - service
   

   [root@shell-master ~]# ansible-doc -s service
   - name: Manage services

   By follow the help documentation, you can use below command format to perform service management, like restart, stop etc.

   ansible webservers -m service -a "name=servicename ......"

5. Ansible module - script
   

   [root@shell-master ~]# ansible-doc -s script
   - name: Runs a local script on a remote node after transferring it

   Example: Build a local script, then transfer it to remote server and execute it
   On shell-master, build a script file named testing.sh with below content (The scripts will create 1 readme.txt under /tmp/, and also create 10 data files under /tmp/):

   #!/bin/bash
   
   cd /tmp/
   
   # create readme.txt under /tmp/
   cat > readme.txt << _EOF_
   This is a testing script
   We'll create 10 data files under /tmp/
   _EOF_
   
   touch data{0..9}.data

   After create the shell script file, you need to change it's access mode, let it can be executed by using below command:

   [root@shell-master ~]# chmod 755 testing.sh
   [root@shell-master ~]# ls -lh testing.sh
   -rwxr-xr-x. 1 root root 169 Aug  8 08:53 testing.sh

   Alright, let's using Ansible to post this script to be execution on remote server. Running below command to invoke ansible script module:

   [root@shell-master ~]# ansible webservers -m script -a "testing.sh"

   

   Then switch back to shell-node1, let's verify if the readme.txt and data files been created or not:
   

6. All good with Ansible common modules now, next let's research on Ansible playbook.