How to upgrade Zookeeper version on Debian

Upgrading the Zookeeper version on Debian system can follow the steps below:

1. Back up existing configuration and data

Before any upgrades, it is highly recommended to back up existing Zookeeper configuration files and data directories.

 sudo cp -r /var/lib/zookeeper /var/lib/zookeeper_backup
sudo cp /etc/zookeeper/conf/zoo.cfg /etc/zookeeper/conf/zoo.cfg_backup

2. Download the new version of Zookeeper

Visit Zookeeper's official website or GitHub repository to download the new version you want to install. For example, if you want to install Zookeeper 3.7.0:

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

3. Unzip the new version

Unzip the downloaded compressed package to the directory of your choice, for example /opt:

 sudo tar -xzf apache-zookeeper-3.7.0-bin.tar.gz -C /opt

4. Stop the currently running Zookeeper service

Make sure that the currently running Zookeeper service has stopped:

 sudo systemctl stop zookeeper

5. Backup and replace configuration files

Copy the new configuration files to the /etc/zookeeper/conf directory and make sure they overwrite the old configuration files:

 sudo cp /opt/apache-zookeeper-3.7.0-bin/conf/zoo.cfg /etc/zookeeper/conf/
sudo cp -r /opt/apache-zookeeper-3.7.0-bin/conf /etc/zookeeper/conf/

6. Update the data directory

Move the old data directory to a safe location and link the new data directory to the old location:

 sudo mv /var/lib/zookeeper /var/lib/zookeeper_old
sudo ln -s /opt/apache-zookeeper-3.7.0-bin/data /var/lib/zookeeper

7. Start a new Zookeeper service

Start a new Zookeeper service and check its status:

 sudo systemctl start zookeeper
sudo systemctl status zookeeper

8. Verify Upgrade

Ensure that the Zookeeper service is running properly and that all nodes have new versions synchronized. You can verify it through Zookeeper's command line tool:

 /opt/apache-zookeeper-3.7.0-bin/bin/zkCli.sh -server localhost:2181

Enter the stat command on the command line to view the status of Zookeeper.

9. Clean up

If you confirm that everything is working, you can delete the backed up old version of the files and directories:

 sudo rm -rf /var/lib/zookeeper_old
sudo rm -rf /opt/apache-zookeeper-3.7.0-bin

Through the above steps, you should be able to successfully upgrade the Zookeeper version on your Debian system. Make sure to carefully check each step throughout the process to avoid any potential problems.

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