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Huawei SAP HANA Appliance Two Node Installation Guide (RH5885H and RH8100 V3+Redhat) 08

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Configuring the NTP Client

Configuring the NTP Client

To implement NTP server time synchronization, the NTP client must be configured for the two HANA servers in the HA cluster.

  1. Log in to a server node as the root user and run the following command to configure the NTP service to start with the startup of Redhat Linux:

    NOTE:

    This step uses Redhat7.2 as an example. Run the chkconfig ntpd on command for Redhat6.7.

    systemctl enable ntpd.service

  2. Run systemctl enable ntpdate.service to start ntpdate service:

    NOTE:

    This step uses Redhat7.2 as an example. Run the chkconfig ntpdate on command for Redhat6.7.

    systemctl enable ntpdate.service

  3. Run the vi /etc/ntp.conf command to open the NTP configuration file ntp.conf.

    #vi /etc/ntp.conf

  4. Press i to switch to the insertion mode.
  5. Insert server <NTP server IP address>. This procedure uses 192.168.20.9 as an example, and you need to change the IP address to the actual NTP server IP address.

    server 192.168.20.9

  6. Press ESC to switch to the CLI mode.
  7. Press the colon (:) to switch to the bottom line mode, type wq, and press Enter to save the modification and exit the vi editor.

    The following is an example of the configured ntp.conf file:

    HW00001:/hana/shared # vi /etc/ntp.conf
    # Clients from this (example!) subnet have unlimited access, but only if
    # cryptographically authenticated.
    #restrict 192.168.123.0 mask 255.255.255.0 notrust
    ##
    ## Miscellaneous stuff
    ##
    driftfile /var/lib/ntp/drift/ntp.drift # path for drift file
    logfile /var/log/ntp          # alternate log file
    # logconfig =syncstatus + sysevents
    # logconfig =all
    # statsdir /tmp/                # directory for statistics files
    # filegen peerstats  file peerstats  type day enable
    # filegen loopstats  file loopstats  type day enable
    # filegen clockstats file clockstats type day enable
    #
    # Authentication stuff
    #
    keys /etc/ntp.keys              # path for keys file
    trustedkey 1                    # define trusted keys
    requestkey 1                    # key (7) for accessing server variables
    # controlkey 15                 # key (6) for accessing server variables
    restrict 127.0.0.1
    restrict -6 ::1
    server 192.168.20.9

  8. Run the systemctl restart ntpd.service command to restart the NTP service.

    NOTE:

    This step uses Redhat7.2 as an example. Run the service ntpd restart command for Redhat6.7.

    systemctl restart  ntpd.service

  9. Run the ntpq -p command to check the NTP running status.

    #ntpq -p

    Example:

    HW00001: # ntpq -p
    remote           refid      st t when poll  reach delay offset  jitter
    ==============================================================================
    *192.168.20.9       LOCAL(0)    11 u 53 64    7    0.141  0.968 0.296

    Main parameters in the command output are described as follows:

    • remote: indicates the name of the NTP server that responds to the request.
    • when: indicates the number of seconds since the last successful request.
    • poll: indicates the interval (in seconds) for the local host to synchronize time with the remote server.
    • offset: indicates the time offset (in milliseconds) between the local host and the time source.

  10. Log in to the other HANA node and repeat the preceding steps to configure the NTP server.

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Updated: 2019-05-14

Document ID: EDOC1100019155

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