f125a8b892
This change addresses a long-standing issue in rST documentation imported from XML.
That import process added backslash escapes in front of various characters. The three
most common being '(', ')', and '_'.
These instances are removed.
Signed-off-by: Ron Stone <ronald.stone@windriver.com>
Change-Id: Id43a9337ffcd505ccbdf072d7b29afdb5d2c997e
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111 lines
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.. jkm1552673113419
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.. _configuring-ntp-servers-and-services-using-horizon:
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================================================
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Configure NTP Servers Using Horizon
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================================================
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You can add or update a list of external NTP servers for |prod| to use for
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time and clock synchronization at any time after installation, using the
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Horizon Web interface.
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**NTP Service**
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.. xbooklink For more information on configuring the NTP service for clock
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synchronization, see |node-doc|: `Host Inventory <hosts-tab>`.
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.. note::
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|NTP| and |PTP| are configured per host. The default is |NTP|.
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Lock/unlock the host when updating **clock_synchronization** for the host.
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**NTP Servers**
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You can specify up to three |NTP| servers using Horizon or the CLI.
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.. note::
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When you change the |NTP|/|PTP| system configuration you have to lock/unlock
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all hosts. This process requires a swact on the controllers. During a
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host swact the system may raise |NTP| alarms.
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.. rubric:: |prereq|
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Before making changes to the list of |NTP| servers, review the Fault Management
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page and ensure that any existing system alarms are cleared.
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.. caution::
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Before you can use fully qualified domain names (FQDN) instead of IPv4
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addresses, at least one valid DNS server is required. To add one, see
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:ref:`Specify DNS Servers Using Horizon <specifying-dns-servers-using-horizon>`.
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.. rubric:: |proc|
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.. _configuring-ntp-servers-and-services-using-horizon-steps-xfh-24z-5p:
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#. In the |prod| Horizon, open the System Configuration page.
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The System Configuration page is available
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from **Admin** \> **Platform** \> **System Configuration** in the left-hand pane.
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#. Select the NTP tab.
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The NTP page appears, showing the currently defined |NTP| servers.
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.. figure:: /shared/figures/system_configuration/jow1413850406811.png
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:scale: 100%
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#. Click **Edit NTP**.
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#. Add or edit the IP addresses or domain names, and then click **Save**.
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#. Click **Save**.
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This raises **250.001 Configuration out-of-date** alarms against the
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controllers, workers, and storages nodes. You can view the alarms on the
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Fault Management page.
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#. Lock and unlock the controllers, workers, and storage nodes to apply the
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configuration and clear the **Configuration out-of-date** alarms.
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Open the Host Inventory page, available
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from **Admin** \> **Platform** \> **Host Inventory** in the left-hand
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pane, and then select the **Hosts** tab. Hosts requiring attention are
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shown with the status **Config out-of-date**.
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To lock or unlock a host, click the **Action Menu** down arrow for the
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host and then use the menu selections.
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#. Lock the standby controller.
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Wait for the lock operation to be completed.
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#. Unlock the standby controller.
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Wait for the host to become available. Its configuration is
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updated, and its error message is cleared.
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#. Perform a swact on the active controller.
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Click **Action Menu (down arrow)** \> **Swact Host** \> for
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the active controller.
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Horizon Web interface access is interrupted, and the |prod| login
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screen appears. Wait briefly for the Web service to stabilize, and
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then log in again.
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#. Lock the original controller (now in standby mode).
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Wait for the lock operation to be completed.
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#. Unlock the original controller.
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Wait for it to become available. Its configuration is updated, and its
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error message is cleared.
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#. Ensure that the **Configuration out-of-date** alarms are cleared for
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both controllers.
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