Linux Redhat 配置 zookeeper 集群

 

 

使用./bin/zkServer.sh start启动zookeeper集群，得到以下信息：

[root@StevenRH6 zookeeper-3.4.6]# ./bin/zkServer.sh start
JMX enabled by default
Using config: /opt/zookeeper/zookeeper-3.4.6/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

而后使用./bin/zkServer.sh status查看集群状态的时候发现了错误：

[root@StevenRH6 zookeeper-3.4.6]# ./bin/zkServer.sh status
JMX enabled by default
Using config: /opt/zookeeper/zookeeper-3.4.6/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.

查看zookeeper启动日志（/opt/zookeeper/zookeeper-3.4.6/bin/zookeeper.out）发现了如下的错误信息：

[root@StevenRH6 ~]# tail -500f /opt/zookeeper/zookeeper-3.4.6/bin/zookeeper.out
.........
.........
2017-06-02 09:52:18,330 [myid:3] - WARN  [QuorumPeer[myid=3]/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@382] - Cannot open channel to 1 at election address RHServer1:3888
java.net.UnknownHostException: RHServer1
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402)
    at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840)
    at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762)
2017-06-02 09:52:18,333 [myid:3] - WARN  [QuorumPeer[myid=3]/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@382] - Cannot open channel to 2 at election address RHServer2:3888
java.net.UnknownHostException: RHServer2
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402)
    at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840)
    at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762)
2017-06-02 09:52:18,333 [myid:3] - INFO  [QuorumPeer[myid=3]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@849] - Notification time out: 60000

 这种情况的出现一般是因为主机设置了防火墙，使用下面语句关闭防火墙即可：

[root@StevenRH6 conf]# sudo service iptables stop
iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Unloading modules:                               [  OK  ]

然后运行如下命令查看zookeeper集群状态：

[root@StevenRH6 zookeeper-3.4.6]# ./bin/zkServer.sh status
JMX enabled by default
Using config: /opt/zookeeper/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: follower ( 也可能为 leader )