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Changing myid of the Original Cluster

The myid values of the original cluster are 1 for ceph1, 2 for ceph2, and 3 for ceph3, which need to be changed to 80, 90, and 100 respectively.

  1. Find the leader node.

    Run the /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh status command on each node to determine the leader node. (For example, ceph3 is the leader node.)

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    [root@ceph3 bin]# /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/apache-zookeeper-3.6.3-bin-bcm/bin/../conf/zoo.cfg
Client port found: 2182. Client address: localhost. Client SSL: false.
Mode: leader
[root@ceph1 bin]# /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/apache-zookeeper-3.6.3-bin-bcm/bin/../conf/zoo.cfg
Client port found: 2182. Client address: localhost. Client SSL: false.
Mode: follower
[root@ceph2 bin]# /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/apache-zookeeper-3.6.3-bin/bin-bcm/../conf/zoo.cfg
Client port found: 2182. Client address: localhost. Client SSL: false.
Mode: follower
  2. Change myid of the three nodes.

    ceph1:

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    echo 80 > /opt/apache-zookeeper-3.6.3-bin-bcm/zkData/myid

    ceph2:

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    echo 90 > /opt/apache-zookeeper-3.6.3-bin-bcm/zkData/myid

    ceph3:

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    echo 100 > /opt/apache-zookeeper-3.6.3-bin-bcm/zkData/myid
  3. Modify the cluster node configuration information in the /opt/apache-zookeeper-3.6.3-bin-bcm/conf/zoo.cfg file of each node.
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    server.80=ceph1:2889:3889;2182
server.90=ceph2:2889:3889;2182
server.100=ceph3:2889:3889;2182
  4. Restart the ZooKeeper server on follower nodes in ascending order based on myid and then the leader node.

    ceph1 (follower):

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    /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh restart

    ceph2 (follower):

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    /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh restart

    ceph3 (leader):

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    /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh restart
  5. Run the /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh status command on each node to check the original cluster status.
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    [root@ceph3 bin]# /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/apache-zookeeper-3.6.3-bin-bcm/bin/../conf/zoo.cfg
Client port found: 2182. Client address: localhost. Client SSL: false.
Mode: follower
[root@ceph1 bin]# /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/apache-zookeeper-3.6.3-bin-bcm/bin/../conf/zoo.cfg
Client port found: 2182. Client address: localhost. Client SSL: false.
Mode: follower
[root@ceph2 bin]# /opt/apache-zookeeper-3.6.3-bin-bcm/bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/apache-zookeeper-3.6.3-bin-bcm/bin/../conf/zoo.cfg
Client port found: 2182. Client address: localhost. Client SSL: false.
Mode: leader