play with ansible

ad-hoc demo

1. hosts inventory file

        $ pico hosts
        [local]
        127.0.0.1
   

2. ping demo

        $ ansible local -i hosts -m ping
   

3. ansible.cfg file

        $ pico ansible.cfg
        [defaults]
        hostfile=hosts
        remote_user=hqlgree2
   

4. do not need -i

        $ ansible local -m ping
   
        $ ansible local -m command -a uptime
   
        # command is the default module
        $ ansible local -a uptime
   

5. command contain space double quote it

        $ ansible local -a "tail /var/log/dmesg"
   

6. sudo as root use -s flag

        $ ansible local -s -a "tail /var/log/syslog"
   

7. install nginx on ubuntu

        $ ansible ubuntubox -s -m apt -a name=nginx
   
        # if fails
        $ ansible ubuntubox -s -m apt -a "name=nginx update_cache=yes"