Configuring the Deployment Environment

Configure the server deployment environment on multiple nodes to ensure a standardized operating environment for subsequent deployment.

1. Log in to all nodes in sequence and change their host names to server1, agent1, agent2 and agent3.

   hostnamectl set-hostname host_name --static

2. Log in to each node and add the mapping between the IP addresses and host names of these nodes.
   1. Open the /etc/hosts file.

      1	vi /etc/hosts

   2. Press i to enter the insert mode and add the following information to the hosts file. Change the IP address based on the site requirements.

      1 2 3 4

      IPaddress1 server1 IPaddress2 agent1 IPaddress3 agent2 IPaddress4 agent3

   3. Press Esc, type :wq!, and press Enter to save the file and exit.
3. Log in to each node and disable the firewall.

   1 2	systemctl stop firewalld.service systemctl disable firewalld.service

4. Log in to each node and enable password-free SSH login.
   1. Generate a key and press Enter if any message is prompted.

      1	ssh-keygen -t rsa

   2. Enable password-free SSH login on each node (including password-free login for the local node):

      1	ssh-copy-id -i ~/.ssh/id_rsa.pub root@node_IP_address

5. Log in to each node and install OpenJDK.
   1. Download OpenJDK and decompress it to the /usr/local directory.
      • Arm:

        1 2	wget https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u252-b09/OpenJDK8U-jdk_aarch64_linux_hotspot_8u252b09.tar.gz tar -zxf OpenJDK8U-jdk_aarch64_linux_hotspot_8u252b09.tar.gz -C /usr/local

      • x86:

        1 2	wget https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u252-b09/OpenJDK8U-jdk_x64_linux_hotspot_8u252b09.tar.gz tar -zxf OpenJDK8U-jdk_x64_linux_hotspot_8u252b09.tar.gz -C /usr/local

   2. Change the owner and group of the extracted JDK directory to root.

      1 2	chown -R root /usr/local/jdk8u252-b09 chgrp -R root /usr/local/jdk8u252-b09

   3. Configure environment variables.
      1. Open the /etc/profile file.

         1	vi /etc/profile

      2. Press i to enter the insert mode and add the following content to the file:

         1 2	export JAVA_HOME=/usr/local/jdk8u252-b09 export PATH=$JAVA_HOME/bin:$PATH

      3. Press Esc, type :wq!, and press Enter to save the file and exit.
   4. Make the environment variables take effect.

      1	source /etc/profile

   5. Check whether the OpenJDK is successfully installed.

      1	java -version

      The installation is successful if information similar to the following is displayed:

      

6. Deploy ZooKeeper. For details, see Deploying ZooKeeper to Running and Verifying ZooKeeper in ZooKeeper Deployment Guide.