Ansible command lines

 Ansible command line helps you to meet your requirement without creating & running playbook.

The purpose of Ansible command is basically:

--> run a single task

--> helpful to run some ad-hoc commands e.g., server uptime, date, filesystem usage report etc.

syntax:  ansible <host-pattern> [options]

-u REMOTE_USER

-m MODULE_NAME

-a module arguments

-i specify inventory host path or comma separated host

-s run operations with sudo

Examples:

1) Get uptime of remote servers:

# ansible all -m command -a uptime

192.168.100.2 | CHANGED | rc=0 >>

 06:04:05 up 3 days, 18:03,  1 user,  load average: 1.49, 1.12, 1.03

192.168.100.1 | CHANGED | rc=0 >>

 06:04:05 up 3 days, 18:02,  1 user,  load average: 1.01, 1.06, 1.08

2) Show hostnames of remote server:

# ansible all -m command -a /usr/bin/hostname

192.168.100.1 | CHANGED | rc=0 >>

example01

192.168.100.2 | CHANGED | rc=0 >>

example02

3) See remote server OS version:

# ansible all -m command -a "cat /etc/redhat-release"

192.168.100.2 | CHANGED | rc=0 >>

Red Hat Enterprise Linux Server release 7.8 (Maipo)

192.168.100.1 | CHANGED | rc=0 >>

Red Hat Enterprise Linux Server release 7.8 (Maipo)

4) See file system usage:

# ansible all -m command -a "df -h /u01"

192.168.100.2 | CHANGED | rc=0 >>

Filesystem      Size  Used Avail Use% Mounted on

/dev/sdb1       300G  183G  118G  61% /u01

192.168.100.1 | CHANGED | rc=0 >>

Filesystem      Size  Used Avail Use% Mounted on

/dev/sdb1       300G  192G  109G  64% /u01

5) See remote server dates:

# ansible all -m command -a "date"

192.168.100.2 | CHANGED | rc=0 >>

Thu Nov 18 06:08:13 GMT 2021

192.168.100.1 | CHANGED | rc=0 >>

Thu Nov 18 06:08:13 GMT 2021