openstack/openstack-manuals
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openstack-manuals/doc/install-guide/source/environment-ntp-controller.rst
Bernd be5d828d3e Document 'allow' clause in /etc/chrony.conf 
Without the 'allow' clause in /etc/chrony.conf, systems can't
use the controller for time synchronization. This patch adds
documentation of the 'allow' clause to the liberty install guide.

Closes-Bug: #1501700

Change-Id: Id4a22c4420da84843f69f3439d4002cd7ec37777
2015-10-02 23:36:54 +09:00

2.2 KiB
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Controller node

Install the NTP service

ubuntu or debian

# apt-get install chrony

rdo

# yum install chrony

obs

On openSUSE:

# zypper addrepo http://download.opensuse.org/repositories/network:time/openSUSE_13.2/network:time.repo
# zypper refresh
# zypper install chrony

On SLES:

# zypper addrepo http://download.opensuse.org/repositories/network:time/SLE_12/network:time.repo
# zypper refresh
# zypper install chrony

Configure the NTP service

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 /etc/chrony.conf:

    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