zookeeper启动报错：org.apache.zookeeper.server.admin.AdminServer$AdminServerException: Problem starting..

异常信息如下：

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:107)
	at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:908)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:205)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:123)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:82)
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:308)
	at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
	at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:236)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.server.Server.doStart(Server.java:396)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.apache.zookeeper.server.admin.JettyAdminServer.start(JettyAdminServer.java:103)
	... 4 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:433)
	at sun.nio.ch.Net.bind(Net.java:425)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:342)
	... 11 more

查看日志可以发现

启动zookeeper失败提示8080端口被占用，这是zookeeper3.5的特性
Zookeeper AdminServer，默认使用8080端口

解决方法：

修改zoo.cfg文件的配置，添加如下配置

admin.serverPort=8888

修改后再次启动zookeeper，查看启动日志，启动成功。

** adminServer的相关配置可以查看zookeeper源码了解 **