Help Center/ CloudPond/ Best Practices/ Best Practices of Load Balancing in Customer-Built Data Centers/ Load Balancing in Customer-Built Data Centers/ Verification test/ LVS Automatically Switching to the Primary Node After the Node Is Recovered
Updated on 2024-05-17 GMT+08:00
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LVS Automatically Switching to the Primary Node After the Node Is Recovered

Objectives

When the keepalived service on the primary LVS node is faulty (for example, the keepalived service is disabled), the standby LVS node takes over services.

Prerequisites

The LVS primary and standby cluster have been correctly configured.

Test Methods

  1. After the standby takes over services, the VIP is on the standby node by default. Run the following command on the standby node:

    ip addr

    The following information is displayed:

    [root@lvs-slave ~]# ip addr
eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:68:dc:b6 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.234/27 brd 182.148.15.255 scope global eth0
    inet 192.168.0.27/32 scope global eth0
    inet6 fe80::5054:ff:fe68:dcb6/64 scope link
       valid_lft forever preferred_lft forever
  2. Run the following command on the primary node to enable the keepalived service:

    service keepalived start

  3. The VIP is assigned to the primary node. Run the following command on the primary node:

    ip addr

    The following information is displayed:

    [root@lvs-master ~]# ip addr
eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:68:dc:b6 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.157/27 brd 182.148.15.255 scope global eth0
    inet 192.168.0.27/32 scope global eth0
    inet6 fe80::5054:ff:fe68:dcb6/64 scope link
       valid_lft forever preferred_lft forever

    Run the following command on the standby node to verify that the VIP information does not exist:

    ip addr

    The following information is displayed:

    [root@lvs-slave ~]# ip addr
eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:68:dc:b6 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.234/27 brd 182.148.15.255 scope global eth0
    inet6 fe80::5054:ff:fe68:dcb6/64 scope link
       valid_lft forever preferred_lft forever
Parent topic: Verification test