1.版本说明
引用官网的说明
DownloadApache ZooKeeper 3.8.0 is our current release, and 3.7.0 our latest stable release.
当前3.7为稳定版本
另外安装zookeeper 需要jdk环境
2.下载
方式一 ： 直接去zookeeper官网上去下载tar包，上传到服务器上
方式二： 直接下载到服务器上（本次采取的方式）
//直接执行下面这条语句可能会出现证书过期的问题 wget https://dlcdn.apache.org/zookeeper/zookeeper-3.7.0/apache-zookeeper-3.7.0-bin.tar.gz --2022-03-25 11:49:53-- https://dlcdn.apache.org/zookeeper/zookeeper-3.7.0/apache-zookeeper-3.7.0-bin.tar.gz Resolving dlcdn.apache.org (dlcdn.apache.org)... 151.101.2.132, 2a04:4e42::644 Connecting to dlcdn.apache.org (dlcdn.apache.org)|151.101.2.132|:443... connected. ERROR: cannot verify dlcdn.apache.org's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’: Issued certificate has expired. To connect to dlcdn.apache.org insecurely, use `--no-check-certificate'. // 并且下面有提示 可以忽略证书 wget --no-check-certificate https://dlcdn.apache.org/zookeeper/zookeeper-3.7.0/apache-zookeeper-3.7.0-bin.tar.gz
注：此次编写是为了是自己熟悉zookeeper的一些坑，以及一些问题交流，如果想要快速上手可以直接用k8s,docker搭建。
依照官网部署，可以发现是用zoo.cgf 配置启动的 ，复制zoo_sample.cfg 文件并重命名即可
# The number of milliseconds of each tick # 心跳时间 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 syncLimit=5 # the directory where the snapshot is stored. # do not use /tmp for storage, /tmp here is just # example sakes. # 持久化 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 ## Metrics Providers # # https://prometheus.io Metrics Exporter #metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider #metricsProvider.httpPort=7000 #metricsProvider.exportJvmInfo=true
3.启动
在准备好相应的配置之后，可以直接通过bin/zkServer.sh 这个脚本进行服务的相关操作
1. 启动ZK服务: sh bin/zkServer.sh start2. 查看ZK服务状态: sh bin/zkServer.sh status3. 停止ZK服务: sh bin/zkServer.sh stop4. 重启ZK服务: sh bin/zkServer.sh restart5 查看帮助： sh bin/zkServer.sh help
[root@zzl bin]# ./zkServer.sh start ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Starting zookeeper ... FAILED TO START // 可以看到 目前启动失败，通过追日志发现 端口8080被占用 2022-03-27 00:28:17,004 [myid:] - ERROR [main:ZooKeeperServerMain@86] - Unable to start AdminServer, exiting abnormally org.apache.zookeeper.server.admin.AdminServer$AdminServerException: Problem starting AdminServer on address 0.0.0.0, port 8080 and command URL /commands at org.apache.zookeeper.server.admin.JettyAdminServer.start(JettyAdminServer.java:179) at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:155) at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:113) at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:68) at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:141) at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:91) Caused by: java.io.IOException: Failed to bind to /0.0.0.0:8080 at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:349) at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:310) at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80) at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:234) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73) at org.eclipse.jetty.server.Server.doStart(Server.java:401) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73) at org.apache.zookeeper.server.admin.JettyAdminServer.start(JettyAdminServer.java:170) ... 5 more Caused by: java.net.BindException: Address already in use at sun.nio.ch.Net.bind0(Native Method) at sun.nio.ch.Net.bind(Net.java:438) at sun.nio.ch.Net.bind(Net.java:430) at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:225) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:344) ... 12 more Unable to start AdminServer, exiting abnormally 2022-03-27 00:28:17,007 [myid:] - INFO [main:ZKAuditProvider@42] - ZooKeeper audit is disabled. 2022-03-27 00:28:17,008 [myid:] - ERROR [main:ServiceUtils@42] - Exiting JVM with code 4
通过官方发现，zookeeper最近的版本中有个内嵌的管理控制台是通过jetty启动，也会占用8080 端口。
通过查看zookeeper的官方文档，发现有3种解决途径：
（1）.删除jetty。
（2）修改端口。
修改方法的方法有两种，一种是在启动脚本中增加 -Dzookeeper.admin.serverPort=你的端口号.一种是在zoo.cfg中增加admin.serverPort=没有被占用的端口号
（3）停用这个服务，在启动脚本中增加"-Dzookeeper.admin.enableServer=false"
再次启动发现可以启动成功
[root@zzl bin]# ./zkServer.sh start ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Starting zookeeper ... STARTED [root@zzl bin]#
客户端的使用下次补充
