Having installed Ansible with our packet manager, the first thing to do is to insert into /etc/ansible_hosts the server we want to manage.

For example








With this in mind, let’s define in the .bashrc file of the user we want to use (in this case root) the env variable $ANSIBLE_HOSTS  with the value ANSIBLE_HOSTS=/etc/ansible_hosts.
The step implied here is that in every node managed from Ansible the user root has an ssh-passwordless secure connection to use.

Now is time to write our first playbook

- name: Prepare NFS for VM
  remote_user: "{{ ruser }}"
  hosts: logs
    - name: mountpoint /store
      mount: name=/store src=xx.xx.xx.xx:/store/prd-logs-0 fstype=nfs4 state=present
    - name: install ntf-utils
      yum: name=nfs-utils state=present

As you can  see we are using ruser and hosts from our ansible_host file in to parametrize the node we want.

Before executing the playbook it’s a good idea to check the syntax

[root@xxxxx playbooks]# ansible-playbook prd-logs-0.yml --check

PLAY [Prepare NFS for VM] *************************************************************

GATHERING FACTS ***************************************************************
ok: [prd-logs-0]

TASK: [mountpoint /store] *****************************************************
skipping: [prd-logs-0]
ok: [prd-logs-0]

TASK: [install ntf-utils] *****************************************************
ok: [prd-logs-0]

PLAY RECAP ********************************************************************
prd-logs-0                 : ok=2    changed=0    unreachable=0    failed=0

And that is the “go go” from Ansible, without errors.

To launch the playbook for real just substitute the check option with a -f X where X is the parallelism that you want (usually is the number of vms you want to change at one time)

This was the first of, hopefully, many howtos on Ansible.

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