5.3.10. Configuring chrony time service

Procedure

1. Create the contents of the chrony.conf file and encode it as base64. For example:

   $ cat << EOF | base64
       pool 0.rhel.pool.ntp.org iburst 1
       driftfile /var/lib/chrony/drift
       makestep 1.0 3
       rtcsync
       logdir /var/log/chrony
   EOF

   1

   Specify any valid, reachable time source, such as the one provided by your DHCP server.

   Example output

   ICAgIHNlcnZlciBjbG9jay5yZWRoYXQuY29tIGlidXJzdAogICAgZHJpZnRmaWxlIC92YXIvbGli
   L2Nocm9ueS9kcmlmdAogICAgbWFrZXN0ZXAgMS4wIDMKICAgIHJ0Y3N5bmMKICAgIGxvZ2RpciAv
   dmFyL2xvZy9jaHJvbnkK

2. Create the MachineConfig object file, replacing the base64 string with the one you just created. This example adds the file to master nodes. You can change it to worker or make an additional MachineConfig for the worker role. Create MachineConfig files for each type of machine that your cluster uses:

   $ cat << EOF > ./99-masters-chrony-configuration.yaml
   apiVersion: machineconfiguration.openshift.io/v1
   kind: MachineConfig
   metadata:
     labels:
       machineconfiguration.openshift.io/role: master
     name: 99-masters-chrony-configuration
   spec:
     config:
       ignition:
         config: {}
         security:
           tls: {}
         timeouts: {}
         version: 2.2.0
       networkd: {}
       passwd: {}
       storage:
         files:
         - contents:
             source: data:text/plain;charset=utf-8;base64,ICAgIHNlcnZlciBjbG9jay5yZWRoYXQuY29tIGlidXJzdAogICAgZHJpZnRmaWxlIC92YXIvbGliL2Nocm9ueS9kcmlmdAogICAgbWFrZXN0ZXAgMS4wIDMKICAgIHJ0Y3N5bmMKICAgIGxvZ2RpciAvdmFyL2xvZy9jaHJvbnkK
             verification: {}
           filesystem: root
           mode: 420
           path: /etc/chrony.conf
     osImageURL: ""
   EOF

3. Make a backup copy of the configuration files.

4. Apply the configurations in one of two ways:

   • If the cluster is not up yet, after you generate manifest files, add this file to the <installation_directory>/openshift directory, and then continue to create the cluster.

   • If the cluster is already running, apply the file:

     $ oc apply -f ./99-masters-chrony-configuration.yaml