How to implement Zookeeper data synchronization on CentOS

Implementing data synchronization of Zookeeper on CentOS usually involves the following steps:

1. Install Zookeeper

First, you need to install Zookeeper on CentOS. You can download the latest version of Zookeeper from the official website of Apache Zookeeper and install it according to the official documentation.

Download and decompress

 wget https://archive.apache.org/dist/zookeeper/zookeeper-3.7.0/apache-zookeeper-3.7.0-bin.tar.gz
tar -xzvf apache-zookeeper-3.7.0-bin.tar.gz -C /opt

Configure environment variables

Edit /etc/profile.d/zookeeper.sh file and add the path to Zookeeper:

 export ZOOKEEPER_HOME=/opt/apache-zookeeper-3.7.0-bin
export PATH=$PATH:$ZOOKEEPER_HOME/bin

Then make the environment variable take effect:

 source /etc/profile.d/zookeeper.sh

Configure Zookeeper

Copy the sample configuration file and modify it:

 cp $ZOOKEEPER_HOME/conf/zoo_sample.cfg $ZOOKEEPER_HOME/conf/zoo.cfg

Edit the zoo.cfg file and add the following to configure multiple nodes:

 tickTime=2000
dataDir=/var/lib/zookeeper
clientPort=2181
initLimit=5
syncLimit=2
server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:38888

Create myid file in /var/lib/zookeeper directory and write the ID of the current node (for example, node 1 writes 1, node 2 writes 2, node 3 writes 3):

 echo "1" > /var/lib/zookeeper/myid # Execute echo "2" on zoo1 node > /var/lib/zookeeper/myid # Execute echo "3" on zoo2 node > /var/lib/zookeeper/myid # Execute echo "3" on zoo2 node > /var/lib/zookeeper/myid # Execute on zoo3 node

2. Start Zookeeper

Start the Zookeeper service on each node:

 zkServer.sh start

3. Verify cluster status

Check the status of the Zookeeper cluster on any node:

 zkServer.sh status

You should be able to see output similar to the following, indicating that the cluster state is normal:

 ZooKeeper JMX enabled by default
Using config: /opt/apache-zookeeper-3.7.0-bin/conf/zoo.cfg
Mode: follow

4. Data synchronization

Zookeeper's data synchronization is performed automatically. When you write data on one node, the data is automatically synchronized to other nodes. You can verify data synchronization by:

 # Create a znode on any node
create /test "Hello Zookeeper"

# Check if the znode exists on another node get /test

5. Monitoring and Maintenance

In order to ensure the stable operation of the Zookeeper cluster, it is recommended to monitor the cluster status regularly and perform necessary maintenance operations, such as:

• Check log file: /var/log/zookeeper/zookeeper.out
• Regularly backup data directory: /var/lib/zookeeper
• Update Zookeeper version for the latest security patches and feature improvements

Through the above steps, you can implement data synchronization of Zookeeper on CentOS.

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