openstack-manuals/doc/install-guide/source/environment-ntp-controller.rst

Controller node

Install and configure components

Install the packages:

ubuntu or debian

# apt-get install chrony

rdo

# yum install chrony

obs

On openSUSE 13.2:

# zypper addrepo -f obs://network:time/openSUSE_13.2 network_time
# zypper refresh
# zypper install chrony

On SLES 12:

# zypper addrepo -f obs://network:time/SLE_12 network_time
# zypper refresh
# zypper install chrony

Note

The packages are signed by GPG key 17280DDF. You should verify the fingerprint of the imported GPG key before using it.

Key Name:         network OBS Project <network@build.opensuse.org>
Key Fingerprint:  0080689B E757A876 CB7DC269 62EB1A09 17280DDF
Key Created:      Tue 24 Sep 2013 04:04:12 PM UTC
Key Expires:      Thu 03 Dec 2015 04:04:12 PM UTC

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.

ubuntu or debian

1. Edit the /etc/chrony/chrony.conf file and add, change, or remove the following 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.

2. Restart the NTP service:

   # service chrony restart

rdo or obs

1. Edit the /etc/chrony.conf file and add, change, or remove the following 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.

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

   allow 10.0.0.0/24

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

3. Start the NTP service and configure it to start when the system boots:

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