Help Center/ MapReduce Service/ User Guide/ Managing Clusters/ Managing an MRS Cluster/ Modifying MRS Manager Routing Table
Updated on 2024-09-23 GMT+08:00
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Modifying MRS Manager Routing Table

When FusionInsight Manager is installed, two pieces of routing information are automatically created on the active management node. You can run the ip rule list command to view the routing information.

0:from all lookup local  
32764:from all to 10.10.100.100 lookup ntp_rt   #NTP routing information created by FusionInsight Manager (this information is unavailable if no external NTP clock source is configured).
32765:from 192.168.0.117 lookup om_rt   #OM routing information created by the FusionInsight Manager.
32766:from all lookup main  
32767:from all lookup default
  • If no external NTP server has been configured, only OM routing information om_rt will be created.
  • This section applies only to MRS 3.x or later.

If the routing information created by FusionInsight Manager conflicts with the routing information configured in the enterprise network planning, the cluster administrator can use autoroute.sh to disable or enable the routing information created by FusionInsight Manager.

Impact on the System

After the routing information created by FusionInsight Manager is disabled and before the new routing information is set, FusionInsight Manager cannot be accessed but the clusters are running properly.

Prerequisites

You have obtained the information about the route to be created.

Disable the Routing Information Created by the System

  1. Log in to the active management node of the cluster as the omm user. Run the following commands to disable the routing information created by the system:

    cd ${BIGDATA_HOME}/om-server/om/sbin

    ./autoroute.sh disable

    Deactivating Route. 
Route operation (disable) successful.

  2. View the execution result.

    ip rule list

    0:from all lookup local  
32766:from all lookup main  
32767:from all lookup default

  3. Run the following command and enter the password of user root to switch to user root:

    su - root

  4. Run the following commands to manually create the routing information about the WS floating IP address:

    ip route add Network segment of the WS floating IP address/Subnet mask of the WS floating IP address scope link src WS floating IP address dev NIC of the WS floating IP address table om_rt

    ip route add default via Gateway of the WS floating IP address dev NIC of the WS floating IP address table om_rt

    ip rule add from WS floating IP address table om_rt

    Example:

    ip route add 192.168.0.0/255.255.255.0 scope link src 192.168.0.117 dev eth0:ws table om_rt

    ip route add default via 192.168.0.254 dev eth0:ws table om_rt

    ip rule add from 192.168.0.117 table om_rt

    If IPv6 addresses are used, run the ip -6 route add command.

  5. Run the following commands to manually create the NTP service routing information. Skip this step when no external NTP clock source is configured.

    ip route add default via IP gateway of the NTP service dev NIC of the local IP address table ntp_rt

    ip rule add to ntpIP table ntp_rt

    NIC of the local IP address indicates the NIC that can communicate with the network segment where the NTP server is located.

    Example:

    ip route add default via 10.10.100.254 dev eth0 table ntp_rt

    ip rule add to 10.10.100.100 table ntp_rt

  6. View the execution result.

    In the following example, if the command output contains om_rt and ntp_rt, the operation is successful.

    ip rule list

    0:from all lookup local   
32764:from all to 10.10.100.100 lookup ntp_rt  #This information is not displayed if no external NTP clock source is configured.
32765:from 192.168.0.117 lookup om_rt  
32766:from all lookup main  
32767:from all lookup default

Enable the Routing Information Created by the System

  1. Log in to the active management node as user omm.
  2. Run the following commands to enable the routing information created by the system:

    cd ${BIGDATA_HOME}/om-server/om/sbin

    ./autoroute.sh enable

    Activating Route. 
Route operation (enable) successful.

  3. View the execution result.

    In the following example, if the command output contains om_rt and ntp_rt, the operation is successful.

    ip rule list

    0:from all lookup local  
32764:from all to 10.10.100.100 lookup ntp_rt  #This information is not displayed if no external NTP clock source is configured.
32765:from 192.168.0.117 lookup om_rt  
32766:from all lookup main  
32767:from all lookup default

Parent topic: Managing an MRS Cluster