Zookeeper super detailed installation cluster deployment

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1. Zookeeper official website download

• Download address: https://archive.apache.org/dist/zookeeper/
• Find the corresponding version to download

2. JDK environment installation

• Directly use yumthe command to install online

yum install -y java-1.8.0-openjdk.x86_64

• Environment variable configuration

sudo vi /etc/profile

export JAVA_HOME=/usr/local/jdk1.8.0_291/
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

• Reload configuration file

sudo source /etc/profile

3. Zookeeper installation

1.zookeeper decompression

• First upload the downloaded apache-zookeeper-3.5.9-bin.tar.gzto the server
• Unzip and install to /usr/local/directory

tar -zxvf apache-zookeeper-3.5.9-bin.tar.gz -C /usr/local/

• As shown below

• Rename tozookeeper

mv apache-zookeeper-3.5.9-bin zookeeper

• As shown below

2.Zookeeper configuration file introduction

• Enter zookeeperconfiguration fileusr/local/zookeeper/conf/
• zoo_sample.cfgRename the configuration file tozoo.cfg

mv zoo_sample.cfg zoo.cfg

• Configuration file introduction

# The number of milliseconds of each tick
# 用于计算基础的实际单位
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
# 初始化时间
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
# 选举时间
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
# 配置zookeeper数据存放路径
dataDir=/tmp/zookeeper
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

• First, zookeepercreate a directory for storing data and logs under the directory zookeeper, and add file read and write permissions.

mkdir data
sudo chmod 777 data
mkdir logs
sudo chmod 777 logs

• As shown in the picture
• Modify configuration file

dataDir=/usr/local/zookeeper/data
dataLogDir=/usr/local/zookeeper/logs

• Cluster configuration

# 集群配置 2888:选举端口 3888:投票端口
server.1=server001:2888:3888
server.2=server002:2888:3888
server.3=server003:2888:3888

• KAFKA001 represents the host name, and you can also write the IP address.
• View hostnamehostnamectl
• Set hostname

sudo hostnamectl set-hostname server001

• /usr/local/zookeeper/dataAdd the unique identifier of this machine cluster to the previously created data directory.
• write1
• Note: myidThe data insideservice一致

echo "1" > myid

• Configuration hostfile vi /etc/hostsadds the host names and IP addresses of the three clusters

192.168.204.130  server001
192.168.204.131  server002
192.168.204.132  server003

• As shown below
  

Clone server

• For detailed operations, see this article: VMware virtual machine cloning and virtual machine copying

1. Network check

• After cloning, check that the three servers can access each other's IP addresses.

2. Cluster configuration

• Remember to modify the host names of the next two servers

sudo hostnamectl set-hostname server002
sudo hostnamectl set-hostname server003

• In the previously created /usr/local/zookeeper/datadata directory, add the unique identifier of this machine cluster [modify the last two]
• The latter two machines write respectively 2,3

echo "2" > myid
echo "3" > myid

3. Start the cluster

• Enter /usr/local/zookeeper/binthe directory and execute./zkServer.sh start

# 可在三台服务器分别执行
/usr/local/zookeeper/bin/zkServer.sh start

• check status

# 可在三台服务器分别执行
/usr/local/zookeeper/bin/zkServer.sh status

• As shown below

4.Error record

• In case of abnormalityERROR
• Execute the command ./zkServer.sh start-foregroundand read the error details in the log to further determine the cause of the error.

/usr/local/zookeeper/bin/zkServer.sh start-foreground

• You need to first rule out that the firewall is turned off. Related commands: CentOS7 [Manage Firewall Port Command]