openstack/openstack-manuals
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b46b1a5689c24d0767f8dbee16a2b6e5fa9fa136
openstack-manuals/doc/install-guide/source/environment-ntp.rst
Matthew Kassawara 374a38f49a [install] Initial networking architecture changes 
Implement initial networking architecture changes for Liberty
as follows:

1) Remove nova-network.
2) Develop architecture for provider networks with Linux
   bridge agent.
3) Develop architecture for self-service networks with
   Linux bridge agent.
4) Munge the neutron controller and network node configuration
   together.
5) Rejigger neutron to use the Linux bridge agent.
6) Restructure launch an instance content to account for
   two networking options.
7) Other restructuring as necessary to meet the primary
   goal.

For simplicity, both architectures require only two nodes,
each with two network interfaces, to deploy core OpenStack
services. Also, to address recurring issues about the lack
of support for connecting instances directly to the
public/external network, the self-service architecture
augments the provider networks architecture which allows
connection to both private and public networks.

Change-Id: Ie3ab9a15ebfe82c0ce54f709c87a66d7cc46db3f
Implements: blueprint installguide-liberty
2015-09-22 10:59:55 -05:00

1.8 KiB
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Configure Network Time Protocol (NTP)

You should install Chrony, an implementation of NTP, to properly synchronize services among nodes. We recommend that you configure the controller node to reference more accurate (lower stratum) servers and other nodes to reference the controller node.

environment-ntp-controller.rst environment-ntp-other.rst

Verify operation

We recommend that you verify NTP synchronization before proceeding further. Some nodes, particularly those that reference the controller node, can take several minutes to synchronize.

  1. Run this command on the controller node:

    # chronyc sources
  210 Number of sources = 2
  MS Name/IP address         Stratum Poll Reach LastRx Last sample
  ===============================================================================
  ^- 192.0.2.11                    2   7    12   137  -2814us[-3000us] +/-   43ms
  ^* 192.0.2.12                    2   6   177    46    +17us[  -23us] +/-   68ms

    Contents in the Name/IP address column should indicate the hostname or IP address of one or more NTP servers. Contents in the S column should indicate * for the server to which the NTP service is currently synchronized.

  2. Run the same command on all other nodes:

    # chronyc sources
  210 Number of sources = 1
  MS Name/IP address         Stratum Poll Reach LastRx Last sample
  ===============================================================================
  ^* controller                    3    9   377   421    +15us[  -87us] +/-   15ms

    Contents in the remote column should indicate the hostname of the controller node.