ZooKeeper audit is enabled. Exiting JVM with code 4

这个问题大概率使因为一边跑javaweb中的tomcat，一边测zookeeper引起的

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:176)
        at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:153)
        at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:112)
        at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:67)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:140)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:90)
Caused by: java.io.IOException: Failed to bind to /0.0.0.0:8080
        at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:346)
        at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:307)
        at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
        at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:231)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
        at org.eclipse.jetty.server.Server.doStart(Server.java:385)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
        at org.apache.zookeeper.server.admin.JettyAdminServer.start(JettyAdminServer.java:167)
        ... 5 more
Caused by: java.net.BindException: Address already in use: bind
        at java.base/sun.nio.ch.Net.bind0(Native Method)
        at java.base/sun.nio.ch.Net.bind(Net.java:461)
        at java.base/sun.nio.ch.Net.bind(Net.java:453)
        at java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:227)
        at java.base/sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:80)
        at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:342)
        ... 12 more
Unable to start AdminServer, exiting abnormally
2021-04-09 09:33:13,221 [myid:] - INFO  [main:ZKAuditProvider@40] - ZooKeeper audit is enabled.
2021-04-09 09:33:13,258 [myid:] - ERROR [main:ServiceUtils@42] - Exiting JVM with code 4

org.apache.zookeeper.server.admin.AdminServer$AdminServerException: Problem starting AdminServer on address 0.0.0.0, port 8080 and command URL /commandsCaused by（AdminServe启动地址8080异常）

java.io.IOException: Failed to bind to /0.0.0.0:8080(绑定本机端口号8080失败，tomcat默认)

Caused by: java.net.BindException: Address already in use: bind（地址已经被使用）

在3.5.5版本及以上，Zookeeper 提供了一个内嵌的Jetty容器来运行 AdminServer，默认占用的是 8080端口，AdminServer 主要是来查看 Zookeeper 的一些状态，如果机器上有其他程序（比如：Tomcat）占用了 8080 端口，会导致Starting zookeeper … FAILED TO START 的问题。

解决方案

1.\1. 如果不需要 AdminServer ，可以直接禁用：打开zoo.cfg 配置文件，直接添加以下语句即可。

admin.enableServer=false

2.换个端口号

admin.serverPort=17900(随意)