openstack/openstack-manuals
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b7c8b5e746864f80090e56c26db949c2a71399d8
openstack-manuals/doc/install-guide/source/environment-ntp-controller.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

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

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