openstack/kolla-ansible
Code Issues Proposed changes

Add additional ntp information around ceph

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Mention `chrony` since thats what docs.openstack.org recommends for
WAN connections. It does do better than ntpd
Change-Id: I28caade26492294bf12b092ff949003c7bf0bb8e
This commit is contained in:
Sam Yaple 2015-11-05 09:10:47 +00:00
parent cf79c8a6f5
commit fdb010e56b
1 changed files with 16 additions and 9 deletions
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25
doc/quickstart.rst
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@ -126,13 +126,17 @@ To install these clients use:
pip install -U python-openstackclient pip install -U python-openstackclient
OpenStack uses healthcheck timers which run off wall-clock time rather then OpenStack, RabbitMQ, and Ceph require all hosts to have matching times to ensure
starting a timer and expiring the timer, encoding the expiration in the message proper message delivery. In the case of Ceph, it will complain if the hosts
contents. In some cases, this timer interval can be on the order of 60 differ by more than 0.05 seconds. Some OpenStack services have timers as low as
seconds. For OpenStack to operate correctly with these tight health-check 2 seconds by default. For these reasons it is highly recommended to setup an NTP
timer intervals, the Kolla community highly recommends running the ntpd service of some kind. While `ntpd` will achieve more accurate time for the
service on all deployment targets. To install, start, and enable ntp deployment if the NTP servers are running in the local deployment environment,
execute the following: `chrony <http://chrony.tuxfamily.org>`_ is more accurate when syncing the time
across a WAN connection. When running Ceph it is recommended to setup `ntpd` to
sync time locally due to the tight time constraints.
To install, start, and enable ntp on CentOS execute the following:
:: ::
@ -141,8 +145,11 @@ execute the following:
systemctl enable ntpd systemctl enable ntpd
systemctl start ntpd systemctl start ntpd
# Ubuntu To install and start on Debian based systems execute the following:
sudo apt-get install ntp
::
apt-get install ntp
Libvirt is started by default on many operating systems. Please disable libvirt Libvirt is started by default on many operating systems. Please disable libvirt
on any machines that will be deployment targets. Only one copy of libvirt may on any machines that will be deployment targets. Only one copy of libvirt may