Recommendation system from scratch (2)-Zookeeper

Zookeeper installation and configuration

1. Download Zookeeper

   Go to the download page of Zookeeper

   

   Select the stable version

   

   

   Right click to copy the link address

   https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/stable/apache-zookeeper-3.5.6-bin.tar.gz
   

   Download using wget

   wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/stable/apache-zookeeper-3.5.6-bin.tar.gz
   

2. Copy files

   tar unzip

   tar -zxf apache-zookeeper-3.5.6-bin.tar.gz
   

   Copy the entire program to /usr/local/

   cp -r apache-zookeeper-3.5.6-bin /usr/local/zookeeper
   

3. Configure Zookeeper

   cd /usr/local/zookeeper
   cp zoo_sample.cfg zoo.cfg
   vi zoo.cfg
   

   An example of the entire configuration file is as follows

    # 服务器之间或客户端与服务器之间维持心跳的时间间隔
    # tickTime以毫秒为单位。
    tickTime=2000
   
    # 集群中的follower服务器(F)与leader服务器(L)之间的初始连接心跳数
    initLimit=10
   
    # 集群中的follower服务器与leader服务器之间请求和应答之间能容忍的最多心跳数
    syncLimit=5
   
    # 快照保存目录
    # 不要设置为/tmp，该目录重新启动后会被自动清除
    dataDir=/usr/local/zookeeper/zkdata
   
    # 日志保存目录
    dataLogDir=/usr/local/zookeeper/zkdatalog
   
    # 客户端连接端口
    clientPort=2181
   
    # 客户端最大连接数。
    # 根据自己实际情况设置，默认为60个
    # maxClientCnxns=60
    # 三个接点配置，格式为：
    # server.服务编号=服务地址、LF通信端口、选举端口
    server.1=salve1:2888:3888
    server.2=slave2:2888:3888
    server.3=slave3:2888:3888
   

   The service number followed by the multiple servers filled in above will be put into the myid of the corresponding machine later

   for i in $(seq 1 3); do scp -r /usr/local/zookeeper Slave$i:/usr/local/zookeeper; done
   

   Copied to each node but has not officially run

4. Create a working directory, configure myid

   for i in $(seq 1 3); do ssh Slave$i 'mkdir -p /usr/local/zookeeper/zkdata'; done
   for i in $(seq 1 3); do ssh Slave$i 'mkdir -p /usr/local/zookeeper/zkdatalog'; done
   for i in $(seq 1 3); do ssh Slave$i 'touch /usr/local/zookeeper/zkdata/myid'; done
   

   Then log in to each node to modify myid (the content depends on the zoo.cfg file above)

   ssh Slave1
   vi /usr/local/zookeeper/zkdata/myid
   

5. Configure environment variables

   vi /etc/profile
   

   Add the following content

   export ZOOKEEPER_HOME=/usr/local/zookeeper
   

6. Start Zookeeper

   Log in to each node to start zookeeper

   ssh Slave1
   cd /usr/local/zookeeper/bin
   ./zkServer.sh start
   

   View zookeeper node status

   ./zkServer.sh status
   

   Should be able to query the following information

   

   Execute the following command

   jps
   

   Can be seen in the output

   QuorumPeerMain
   

At this point Zookeeper distributed completion