Improved installation guide NTP section
I improved the NTP section of the installation guide as follows: 1) Changed configuration of other nodes to reference controller node. 2) Added section to verify synchronization of all nodes. Change-Id: I2de93426b3cf82a100a0b217f1272fc0e59ddb92 Implements: blueprint installation-guide-improvements
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Matthew Kassawara
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@ -4,28 +4,147 @@
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xml:id="basics-ntp">
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xml:id="basics-ntp">
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<?dbhtml-stop-chunking?>
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<?dbhtml-stop-chunking?>
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<title>Network Time Protocol (NTP)</title>
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<title>Network Time Protocol (NTP)</title>
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<para>To synchronize services across multiple machines, you must
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<para>You must install
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install <glossterm baseform="Network Time Protocol (NTP)">NTP</glossterm>.
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<glossterm baseform="Network Time Protocol (NTP)">NTP</glossterm> to
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The examples in this guide configure the controller
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properly synchronize services among nodes. We recommend that you configure
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node as the reference server and any additional nodes to set
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the controller node to reference upstream servers and other nodes to
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their time from the controller node.</para>
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reference the controller node.</para>
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<para>Install the <literal>ntp</literal> package on each system
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<section xml:id="basics-ntp-controller-node">
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running OpenStack services:</para>
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<title>Configure controller node</title>
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<screen os="ubuntu;debian"><prompt>#</prompt> <userinput>apt-get install ntp</userinput></screen>
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<procedure>
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<screen os="rhel;fedora;centos"><prompt>#</prompt> <userinput>yum install ntp</userinput></screen>
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<title>To install the NTP service</title>
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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>zypper install ntp</userinput></screen>
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<step>
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<para os="rhel;fedora;centos;opensuse;sles">Set up the NTP server
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<screen os="ubuntu;debian"><prompt>#</prompt> <userinput>apt-get install ntp</userinput></screen>
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on your controller node so that it receives data by modifying
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<screen os="rhel;fedora;centos"><prompt>#</prompt> <userinput>yum install ntp</userinput></screen>
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the <filename>ntp.conf</filename> file and restarting the
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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>zypper install ntp</userinput></screen>
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service:</para>
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</step>
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<screen os="rhel;fedora;centos"><prompt>#</prompt> <userinput>service ntpd start</userinput>
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</procedure>
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<procedure>
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<title>To configure the NTP service</title>
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<para>By default, the controller node synchronizes the time via a pool
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of public servers. However, you can optionally edit the
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<filename>/etc/ntp.conf</filename> file to configure alternative
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servers such as those provided by your organization.</para>
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<step>
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<para>Edit the <filename>/etc/ntp.conf</filename> file:</para>
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<para>Add, change, or remove the <literal>server</literal> keys as
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necessary for your environment. Replace
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<replaceable>NTP_SERVER</replaceable> with the hostname or IP address
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of suitable NTP server.</para>
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<programlisting>server <replaceable>NTP_SERVER</replaceable> iburst</programlisting>
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<note os="ubuntu;debian">
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<para>Remove the <filename>/var/lib/ntp/ntp.conf.dhcp</filename> file
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if it exists.</para>
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</note>
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</step>
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<step os="ubuntu;debian">
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<para>Restart the NTP service:</para>
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<screen><prompt>#</prompt> <userinput>service ntp restart</userinput></screen>
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</step>
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<step os="rhel;centos;fedora;sles;opensuse">
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<para>Start the NTP service and configure it to start when the system
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boots:</para>
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<screen os="rhel;fedora;centos"><prompt>#</prompt> <userinput>service ntpd start</userinput>
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<prompt>#</prompt> <userinput>chkconfig ntpd on</userinput></screen>
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<prompt>#</prompt> <userinput>chkconfig ntpd on</userinput></screen>
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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>service ntp start</userinput>
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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>service ntp start</userinput>
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<prompt>#</prompt> <userinput>chkconfig ntp on</userinput></screen>
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<prompt>#</prompt> <userinput>chkconfig ntp on</userinput></screen>
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<para>It is advised that you configure additional nodes
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</step>
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to synchronize their time from the controller node
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</procedure>
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rather than from outside of your LAN. To do so, install the ntp
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</section>
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daemon as above, then edit <filename>/etc/ntp.conf</filename>
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<section xml:id="basics-ntp-other-nodes">
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and change the <code>server</code> directive to use the
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<title>Configure other nodes</title>
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controller node as internet time source.</para>
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<procedure>
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<title>To install the NTP service</title>
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<step>
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<screen os="ubuntu;debian"><prompt>#</prompt> <userinput>apt-get install ntp</userinput></screen>
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<screen os="rhel;fedora;centos"><prompt>#</prompt> <userinput>yum install ntp</userinput></screen>
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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>zypper install ntp</userinput></screen>
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</step>
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</procedure>
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<procedure>
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<title>To configure the NTP service</title>
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<para>Configure the network and compute nodes to reference the
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controller node.</para>
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<step>
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<para>Edit the <filename>/etc/ntp.conf</filename> file:</para>
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<para>Comment out or remove all but one <literal>server</literal>
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key and change it to reference the controller node.</para>
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<programlisting>server <replaceable>controller</replaceable> iburst</programlisting>
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<note os="ubuntu;debian">
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<para>Remove the <filename>/var/lib/ntp/ntp.conf.dhcp</filename> file
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if it exists.</para>
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</note>
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</step>
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<step os="ubuntu;debian">
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<para>Restart the NTP service:</para>
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<screen><prompt>#</prompt> <userinput>service ntp restart</userinput></screen>
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</step>
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<step os="rhel;centos;fedora;sles;opensuse">
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<para>Start the NTP service and configure it to start when the system
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boots:</para>
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<screen os="rhel;fedora;centos"><prompt>#</prompt> <userinput>service ntpd start</userinput>
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<prompt>#</prompt> <userinput>chkconfig ntpd on</userinput></screen>
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<screen os="opensuse;sles"><prompt>#</prompt> <userinput>service ntp start</userinput>
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<prompt>#</prompt> <userinput>chkconfig ntp on</userinput></screen>
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</step>
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</procedure>
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</section>
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<section xml:id="basics-ntp-verify">
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<title>Verify operation</title>
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<para>We recommend that you verify NTP synchronization before proceeding
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further. Some nodes, particularly those that reference the controller
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node, can take several minutes to synchronize.</para>
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<procedure>
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<title>To verify NTP synchronization</title>
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<step>
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<para>Run this command on the <emphasis>controller</emphasis> node:
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</para>
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<screen><prompt>#</prompt> <userinput>ntpq -c peers</userinput>
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<computeroutput> remote refid st t when poll reach delay offset jitter
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==============================================================================
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*ntp-server1 192.0.2.11 2 u 169 1024 377 1.901 -0.611 5.483
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+ntp-server2 192.0.2.12 2 u 887 1024 377 0.922 -0.246 2.864</computeroutput></screen>
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<para>Contents in the <emphasis>remote</emphasis> column should
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indicate the hostname or IP address of one or more NTP servers.</para>
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<note>
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<para>Contents in the <emphasis>refid</emphasis> column typically
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reference IP addresses of upstream servers.</para>
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</note>
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</step>
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<step>
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<para>Run this command on the <emphasis>controller</emphasis> node:
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</para>
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<screen><prompt>#</prompt> <userinput>ntpq -c assoc</userinput>
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<computeroutput>ind assid status conf reach auth condition last_event cnt
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===========================================================
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1 20487 961a yes yes none sys.peer sys_peer 1
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2 20488 941a yes yes none candidate sys_peer 1</computeroutput></screen>
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<para>Contents in the <emphasis>condition</emphasis> column should
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indicate <literal>sys.peer</literal> for at least one server.</para>
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</step>
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<step>
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<para>Run this command on <emphasis>all other</emphasis> nodes:</para>
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<screen><prompt>#</prompt> <userinput>ntpq -c peers</userinput>
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<computeroutput> remote refid st t when poll reach delay offset jitter
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==============================================================================
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*controller 192.0.2.21 3 u 47 64 37 0.308 -0.251 0.079</computeroutput></screen>
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<para>Contents in the <emphasis>remote</emphasis> column should
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indicate the hostname of the controller node.</para>
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<note>
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<para>Contents in the <emphasis>refid</emphasis> column typically
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reference IP addresses of upstream servers.</para>
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</note>
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</step>
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<step>
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<para>Run this command on <emphasis>all other</emphasis> nodes:
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</para>
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<screen><prompt>#</prompt> <userinput>ntpq -c assoc</userinput>
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<computeroutput>ind assid status conf reach auth condition last_event cnt
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===========================================================
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1 21181 963a yes yes none sys.peer sys_peer 3</computeroutput></screen>
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<para>Contents in the <emphasis>condition</emphasis> column should
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indicate <literal>sys.peer</literal>.</para>
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</step>
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</procedure>
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</section>
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</section>
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</section>
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