ZooKeeper stand-alone installation

The installation directory takes / opt/share/zk as an example

1. Create a new directory / opt/share/zk. The command is as follows:

   mkdir -p /opt/share/zk
   

2. Enter / opt/share/zk directory and upload jdk-8u301-linux-x64 tar. GZ file

3. Unzip jdk-8u301-linux-x64.0 tar. GZ file, the command is as follows:

   tar -zxvf jdk-8u301-linux-x64.tar.gz
   

4. Modify the java execution permission. The command is as follows:

   chmod u+x jdk1.8.0_301/bin/java*
   

5. Upload apache-zookeeper-3.6.3-bin.com tar. GZ file

6. Unzip apache-zookeeper-3.6.3-bin tar. GZ file, the command is as follows:

   tar -zxvf apache-zookeeper-3.6.3-bin.tar.gz
   

7. Create a new subdirectory snapshot and log under apache-zookeeper-3.6.3-bin/data /. The command is as follows:

   mkdir -p /opt/share/zk/apache-zookeeper-3.6.3-bin/data/snapshot
   mkdir -p /opt/share/zk/apache-zookeeper-3.6.3-bin/data/log
   

8. Enter apache-zookeeper-3.6.3-bin/conf directory and create a new Java Env file, the command is as follows:

   touch java.env
   vi java.env
   

   java.env file contents are as follows:

   #!/bin/sh
   #Configure JDK directory
   export JAVA_HOME=/opt/share/zk/jdk1.8.0_301
   #Configure JVM parameters
   export JVMFLAGS="-Xms1024m -Xmx1024m $JVMFLAGS"
   

   Modify Java Env file execution permission

   chmod u+x java.env
   

9. Copy profile_ sample. CFG is zoo CFG, the command is as follows:

   cd apache-zookeeper-3.6.3-bin/conf
   cp zoo_sample.cfg zoo.cfg
   

10. Modify zoo CFG configuration file, the command is as follows:

    vi zoo.cfg
    

    The following is the modified configuration

    #Communication port with client (agent)
    clientPort=2181
    #Snapshot storage directory. Modified position: line 12
    dataDir=/opt/share/zk/apache-zookeeper-3.6.3-bin/data/snapshot
    # Open (remove the comments), keep the number of snapshots, and modify the position: line 25
    autopurge.snapRetainCount=10
    # Enable (remove the comments) to automatically clean up the transaction log and snapshot files. The unit is hour. The default is 0, which means that the automatic cleaning function is not enabled. Modified position: line 28
    autopurge.purgeInterval=24
    

    The following is the new configuration. Add the following configuration at the end of the file

    #Transaction log storage directory
    dataLogDir=/opt/share/zk/apache-zookeeper-3.6.3-bin/data/log
    #View service information in HTTP mode
    admin.serverPort=8081
    #Open audit log
    audit.enable=true
    

    2181 open to agent

    The open port command is as follows:

    # Open 2181 port
    firewall-cmd --zone=public --add-port=2181/tcp --permanent
    # Reload firewall rules
    firewall-cmd --reload
    

11. Enter / opt/share/zk/apache-zookeeper-3.6.3-bin/bin directory and start ZooKeeper

    cd ../bin
    ./zkServer.sh start
    

    If the following information is printed, the startup is successful

    ZooKeeper JMX enabled by default
    Using config: /opt/share/zk/apache-zookeeper-3.6.3-bin/bin/.../conf/zoo.cfg
    Starting zookeeper ... STARTED

12. View the process according to the port. The command is as follows:

    netstat -anp | grep 2181
    

    Print the following information

    tcp6 0 0 :::2181 ::😗 LISTEN 3538/java

13. If you need to shut down, you can use the following command:

    ./zkServer.sh stop
    

    The normal printing information is as follows:

    ZooKeeper JMX enabled by default
    Using config: /opt/share/zk/apache-zookeeper-3.6.3-bin/bin/.../conf/zoo.cfg
    Stopping zookeeper ... STOPPED

ZooKeeper cluster installation

The installation directory takes / opt/share/zk as an example

ZooKeeper cluster recommends installing an odd number of machines. Now take building three machines as an example.

The three machines are as follows:

• 192.168.64.136
• 192.168.64.137
• 192.168.64.138

Take 192.168.64.136 machine as an example, the installation steps are as follows:

1. Create a new directory / opt/share/zk. The command is as follows:

   mkdir -p /opt/share/zk
   

2. Enter / opt/share/zk directory and upload jdk-8u301-linux-x64 tar. GZ file

3. Unzip jdk-8u301-linux-x64.0 tar. GZ file, the command is as follows:

   tar -zxvf jdk-8u301-linux-x64.tar.gz
   

4. Modify the java execution permission. The command is as follows:

   chmod u+x jdk1.8.0_301/bin/java*
   

5. Upload apache-zookeeper-3.6.3-bin.com tar. GZ file

6. Unzip apache-zookeeper-3.6.3-bin tar. GZ file, the command is as follows:

   tar -zxvf apache-zookeeper-3.6.3-bin.tar.gz
   

7. /Create a new subdirectory snapshot and log under opt/share/zk/apache-zookeeper-3.6.3-bin/data /

   mkdir -p /opt/share/zk/apache-zookeeper-3.6.3-bin/data/snapshot
   mkdir -p /opt/share/zk/apache-zookeeper-3.6.3-bin/data/log
   

8. Enter / opt/share/zk/apache-zookeeper-3.6.3-bin/data/snapshot directory and create myid file. The command is as follows:

   cd /opt/share/zk/apache-zookeeper-3.6.3-bin/data/snapshot
   echo "1" > myid
   

   Create myid files in / opt/share/zk/apache-zookeeper-3.6.3-bin/data/snapshot directory of each machine in turn:

   192.168.64.137 the content of the machine myid file is 2, and the command is as follows:

   echo "2" > myid
   

   192.168.64.138 the content of the machine myid file is 3, and the command is as follows:

   echo "3" > myid
   

9. Enter the / opt/share/zk/apache-zookeeper-3.6.3-bin/conf directory and create a new Java Env file, the command is as follows:

   touch java.env
   vi java.env
   

   java.env file contents are as follows:

   #!/bin/sh
   #Configure JDK directory
   export JAVA_HOME=/opt/share/zk/jdk1.8.0_301
   #Configure JVM parameters
   export JVMFLAGS="-Xms1024m -Xmx1024m $JVMFLAGS"
   

   Modify Java Env file execution permission

   chmod u+x java.env
   

10. Copy profile_ sample. CFG is zoo CFG, the command is as follows:

    cd apache-zookeeper-3.6.3-bin/conf
    cp zoo_sample.cfg zoo.cfg
    

11. Modify zoo CFG configuration file, the command is as follows:

    vi zoo.cfg
    

    The following is the modified configuration

    #Communication port with client (agent)
    clientPort=2181
    #Snapshot storage directory. Modified position: line 12
    dataDir=/opt/share/zk/apache-zookeeper-3.6.3-bin/data/snapshot
    # Open (remove the comments), keep the number of snapshots, and modify the position: line 25
    autopurge.snapRetainCount=10
    # Enable (remove the comments) to automatically clean up the transaction log and snapshot files. The unit is hour. The default is 0, which means that the automatic cleaning function is not enabled. Modified position: line 28
    autopurge.purgeInterval=24
    

    The following is the new configuration. Add the following configuration at the end of the file

    #Transaction log storage directory
    dataLogDir=/opt/share/zk/apache-zookeeper-3.6.3-bin/data/log
    #View service information in HTTP mode
    admin.serverPort=8081
    #Open audit log
    audit.enable=true
    #Cluster node configuration
    server.1=192.168.64.136:2888:3888
    server.2=192.168.64.137:2888:3888
    server.3=192.168.64.138:2888:3888
    

    Note that ports 2888 and 3888 need to be interconnected between the three machines to ensure that port 2181 is open to AGENT

    The open port command is as follows:

    # Open 2181 port
    firewall-cmd --zone=public --add-port=2181/tcp --permanent
    firewall-cmd --zone=public --add-port=2888/tcp --permanent
    firewall-cmd --zone=public --add-port=3888/tcp --permanent
    # Reload firewall rules
    firewall-cmd --reload
    

    Modify each machine zoo CFG configuration file, the content is the same.

    The configuration format is described as follows:

    server.A=B:C:D

    A: The serial number of ZooKeeper server, which should be consistent with the myid content of ZooKeeper

    B: IP address or domain name of the server

    C: The communication port between the server Follower and the Leader server in the cluster

    D: Leader election port.

12. Install and configure 192.168.64.137 and 192.168.64.138 machines according to steps 1-11 above. Note that in step 8, the myid value is modified

13. Enter the / opt/share/zk/apache-zookeeper-3.6.3-bin/bin directory of each machine in turn and start ZooKeeper

    cd /opt/share/zk/apache-zookeeper-3.6.3-bin/bin
    ./zkServer.sh start
    

    If the following information is printed, the startup is successful

    ZooKeeper JMX enabled by default
    Using config: /opt/share/zk/apache-zookeeper-3.6.3-bin/bin/.../conf/zoo.cfg
    Starting zookeeper ... STARTED

14. Verify the cluster status. The command is as follows:

    ./zkServer.sh status
    

    If the following information is printed, it indicates that the node is a Leader

    ZooKeeper JMX enabled by default
    Using config: /opt/share/zk/apache-zookeeper-3.6.3-bin/bin/.../conf/zoo.cfg
    Client port found: 2181. Client address: localhost. Client SSL: false.
    Mode: leader

    If the following information is printed, it indicates that the node is a follower

    ZooKeeper JMX enabled by default
    Using config: /opt/share/zk/apache-zookeeper-3.6.3-bin/bin/.../conf/zoo.cfg
    Client port found: 2181. Client address: localhost. Client SSL: false.
    Mode: follower

15. View the process according to the port. The command is as follows:

    netstat -anp | grep 2181
    

    Print the following information

    tcp6 0 0 :::2181 ::😗 LISTEN 3538/java

16. If you need to shut down, you can use the following command:

    ./zkServer.sh stop
    

    The normal printing information is as follows:

    ZooKeeper JMX enabled by default
    Using config: /opt/share/zk/apache-zookeeper-3.6.3-bin/bin/.../conf/zoo.cfg
    Stopping zookeeper ... STOPPED