Chapter 21. Configuring time synchronization by using the timesync RHEL System Role

Procedure

1. Create a new playbook.yml file with the following content:

   ---
   - hosts: timesync-test
     vars:
       timesync_ntp_servers:
         - hostname: 2.rhel.pool.ntp.org
           pool: yes
           iburst: yes
     roles:
       - rhel-system-roles.timesync

2. Optional: Verify playbook syntax.

   # ansible-playbook --syntax-check playbook.yml

3. Run the playbook on your inventory file:

   # ansible-playbook -i inventory_file /path/to/file/playbook.yml

Procedure

1. Create a playbook.yml file with the following content:

   ---
   - hosts: timesync-test
     vars:
       timesync_ntp_servers:
         - hostname: ptbtime1.ptb.de
           iburst: yes
           nts: yes
     roles:
       - rhel-system-roles.timesync

   ptbtime1.ptb.de is an example of public server. You may want to use a different public server or your own server.

2. Optional: Verify playbook syntax.

   # ansible-playbook --syntax-check playbook.yml

3. Run the playbook on your inventory file:

   # ansible-playbook -i inventory_file /path/to/file/playbook.yml

Verification

1. Perform a test on the client machine:

   # chronyc -N authdata
   
   Name/IP address         Mode KeyID Type KLen Last Atmp  NAK Cook CLen
   =====================================================================
   ptbtime1.ptb.de         NTS     1   15  256  157    0    0    8  100

2. Check that the number of reported cookies is larger than zero.