微服务的调用方式----服务中心zookeeper的搭建

红太狼 2022-12-10 07:11 158阅读 0赞

标准：  
1.根据拆分的思想进行分布式的设计  
2.当异常发生时，可以自动的故障迁移无需人为的干预  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80OTMyOTgxNA_size_16_color_FFFFFF_t_70_pic_center]

服务中心  
zookeeper:  
单台搭建：

安装：[下载zookeeper][zookeeper]  
配置：  
解压后进入zookeeper根目录  
创建文件夹`mkdir data log`

[root@127 zookeeper]# cd data
    [root@127 data]# pwd
    /usr/local/src/zookeeper/data
    [root@127 data]#

复制当前路径  
进如conf文件夹进行配置

[root@127 conf]# cd ../conf/
    [root@127 conf]# cp zoo_sample.cfg zoo.cfg
    [root@127 conf]# vim zoo.cfg

修改配置文件

# The number of milliseconds of each tick
    tickTime=2000
    # The number of ticks that the initial 
    # synchronization phase can take
    initLimit=10
    # The number of ticks that can pass between 
    # sending a request and getting an acknowledgement
    syncLimit=5
    # the directory where the snapshot is stored.
    # do not use /tmp for storage, /tmp here is just 
    # example sakes.
    
    
    #### 这里修改为我们创建的文件夹
    dataDir=/usr/local/src/zookeeper/data
    dataLogDir=/usr/local/src/zookeeper/log
    
    
    
    # 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
    
    ## Metrics Providers
    #
    # https://prometheus.io Metrics Exporter
    #metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
    #metricsProvider.httpPort=7000
    #metricsProvider.exportJvmInfo=true

启动：

[root@127 conf]# cd ../bin/
    [root@127 bin]# ls
    README.txt    zkCli.cmd  zkEnv.cmd  zkServer.cmd            zkServer.sh            zkSnapShotToolkit.sh  zkTxnLogToolkit.sh
    zkCleanup.sh  zkCli.sh   zkEnv.sh   zkServer-initialize.sh  zkSnapShotToolkit.cmd  zkTxnLogToolkit.cmd
    [root@127 bin]# sh zkServer.sh start zoo.cfg

查看当前是否启动

sh zkServer.sh status zoo.cfg
    
    
    ZooKeeper JMX enabled by default
    Using config: /usr/local/src/zookeeper/bin/../conf/zoo.cfg
    Client port found: 2181. Client address: localhost.
    Mode: standalone

一台主机搭建集群：  
在zookeeper的根目录下创建目录zkCluster和其子目录

mkdir zkCluster
    创建其子目录以及myid（搭建3台所以是1-3）
    for i in `seq 1 3`; do mkdir -p zk${i}/{data,log}; touch zk${i}/data/myid; echo ${i}>zk${i}/data/myid;done

进入conf文件夹  
将zoo.cfg复制三份  
分别为123

[root@127 conf]# ls
    configuration.xsl  log4j.properties  zoo1.cfg   zoo2.cfg    zoo3.cfg    zoo.cfg  zoo_sample.cfg
    [root@127 conf]#

zoo.cfg

# The number of milliseconds of each tick
    tickTime=2000
    # The number of ticks that the initial
    # synchronization phase can take
    initLimit=10
    # The number of ticks that can pass between
    # sending a request and getting an acknowledgement
    syncLimit=5
    # the directory where the snapshot is stored.
    # do not use /tmp for storage, /tmp here is just
    # example sakes.
    
    
    ##修改为对应的文件夹
    dataDir=/usr/local/src/zookeeper/zkCluster/zk1/data
    dataLogDir=/usr/local/src/zookeeper/zkCluster/zk1/log
    # the port at which the clients will connect
    
    
    
    #每个配置文件端口修改不一样
    clientPort=2181
    
    
    
    ##这个地方三个配置文件都一样
    server.1=192.168.126.129:2887:3887
    server.2=192.168.126.129:2888:3888
    server.3=192.168.126.129:2889:3889
    # 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
    
    ## Metrics Providers
    #
    # https://prometheus.io Metrics Exporter
    #metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
    #metricsProvider.httpPort=7000
    #metricsProvider.exportJvmInfo=true

然后启动

sh zkServe.sh start zoo1.cfg
    sh zkServe.sh start zoo2.cfg
    sh zkServe.sh start zoo3.cfg

查看状态

sh zkServe.sh status zoo1.cfg
    sh zkServe.sh status zoo2.cfg
    sh zkServe.sh status zoo3.cfg

[root@127 bin]# sh zkServer.sh status zoo2.cfg
    ZooKeeper JMX enabled by default
    Using config: /usr/local/src/zookeeper/bin/../conf/zoo2.cfg
    Client port found: 2182. Client address: localhost.
    Mode: leader
    [root@127 bin]# sh zkServer.sh status zoo1.cfg
    ZooKeeper JMX enabled by default
    Using config: /usr/local/src/zookeeper/bin/../conf/zoo1.cfg
    Client port found: 2181. Client address: localhost.
    Mode: follower
    [root@127 bin]# sh zkServer.sh status zoo3.cfg
    ZooKeeper JMX enabled by default
    Using config: /usr/local/src/zookeeper/bin/../conf/zoo1.cfg
    Client port found: 2183. Client address: localhost.
    Mode: follower

选举策略  
myid值大的优先，超过半数投票则当选，并结束选举  
举例：  
1 启动 集群还未工作  
2启动 2>3/2 集群启动 2>1 选举2当主机 并结束选举  
3启动 2已经当选 3当丛机

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[zookeeper]: https://zookeeper.apache.org/releases.html