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openstack-manuals/doc/install-guide/source/environment-ntp-controller.rst
Petr Kovar 7c7791c66d [install] General edits for install guide 
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Change-Id: I258d6ce980b0b3408d88b40e487f3079c2b55cdb
2017-08-29 15:57:24 +00:00

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Controller node

Perform these steps on the controller node.

Install and configure components

  1. Install the packages:

    For Ubuntu:

    # apt install chrony

    For RHEL or CentOS:

    # yum install chrony

    For SUSE:

    # zypper install chrony

  2. Edit the /etc/chrony/chrony.conf file and add, change, or remove these keys as necessary for your environment:

    server NTP_SERVER iburst

    Replace NTP_SERVER with the hostname or IP address of a suitable more accurate (lower stratum) NTP server. The configuration supports multiple server keys.

    Note

    By default, the controller node synchronizes the time via a pool of public servers. However, you can optionally configure alternative servers such as those provided by your organization.

  3. To enable other nodes to connect to the chrony daemon on the controller node, add this key to the /etc/chrony/chrony.conf file:

    allow 10.0.0.0/24

    If necessary, replace 10.0.0.0/24 with a description of your subnet.

  4. Restart the NTP service:

    For Ubuntu:

    # service chrony restart

    For RHEL, CentOS, or SUSE:

    # systemctl enable chronyd.service
# systemctl start chronyd.service