启动zookeeper报错Error contacting service. It is probably not running解决

搭建zookeeper集群，发现启动失败

[root@localhost bin]# zkServer.sh status JMX enabled by default Using config: /opt/apps/zookeeper-3.4.6/bin/../conf/zoo.cfg Error contacting service. It is probably not running. [root@localhost bin]# zkServer.sh start JMX enabled by default Using config: /opt/apps/zookeeper-3.4.6/bin/../conf/zoo.cfg Starting zookeeper ... already running as process 7180.

查看日志：显示如下信息

2020-09-04 15:30:47,113 [myid:1] - ERROR [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:Learner@230] - Unexpected exception java.net.NoRouteToHostException: 没有到主机的路由 (Host unreachable) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.apache.zookeeper.server.quorum.Learner.connectToLeader(Learner.java:225) at org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:71) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:786) 2020-09-04 15:30:47,113 [myid:1] - WARN [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:Follower@89] - Exception when following the leader java.net.NoRouteToHostException: 没有到主机的路由 (Host unreachable) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.apache.zookeeper.server.quorum.Learner.connectToLeader(Learner.java:225) at org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:71) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:786) 2020-09-04 15:30:47,114 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:Follower@166] - shutdown called java.lang.Exception: shutdown Follower at org.apache.zookeeper.server.quorum.Follower.shutdown(Follower.java:166) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:790) 2020-09-04 15:30:47,114 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FollowerZooKeeperServer@139] - Shutting down 2020-09-04 15:30:47,114 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:ZooKeeperServer@441] - shutting down 2020-09-04 15:30:47,115 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumPeer@714] - LOOKING 2020-09-04 15:30:47,117 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@815] - New election. My id = 1, proposed zxid=0x0 2020-09-04 15:30:47,117 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:47,122 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:47,122 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 3 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:47,323 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@849] - Notification time out: 400 2020-09-04 15:30:47,323 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:47,326 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 3 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:47,326 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:47,727 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@849] - Notification time out: 800 2020-09-04 15:30:47,727 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:47,728 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 3 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:47,728 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:48,528 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@849] - Notification time out: 1600 2020-09-04 15:30:48,529 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:48,533 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 3 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:48,533 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:50,134 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@849] - Notification time out: 3200 2020-09-04 15:30:50,135 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:50,138 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 3 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:50,140 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:53,341 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@849] - Notification time out: 6400 2020-09-04 15:30:53,341 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:53,342 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:53,342 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 3 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:57,278 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:57,278 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:30:57,279 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x67 (n.round), LEADING (n.state), 3 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:31:03,112 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 3 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:31:03,114 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 3 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:31:03,115 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x68 (n.round), LEADING (n.state), 2 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state) 2020-09-04 15:31:03,315 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumPeer@784] - FOLLOWING 2020-09-04 15:31:03,315 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:ZooKeeperServer@162] - Created server with tickTime 2000 minSessionTimeout 4000 maxSessionTimeout 40000 datadir /var/cyj/zookeeper/datalog/version-2 snapdir /opt/apps/zookeeper-3.4.6/data/version-2 2020-09-04 15:31:03,315 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:Follower@63] - FOLLOWING - LEADER ELECTION TOOK - 16200 2020-09-04 15:31:03,316 [myid:1] - WARN [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:Learner@233] - Unexpected exception, tries=0, connecting to node3/192.168.247.33:2881

如上显示2181端口被关闭，所以可能被占用了

查看该端口 关闭端口 重新启动，成功！