linux 下搭建zookeeper集群 踩坑经过，Java面试题集2021版

linux 下搭建zookeeper集群 踩坑经过，Java面试题集2021版

echo “1” > /usr/local/zookeeper/data/myid

#在192.168.xx.129服务器上面创建myid文件，并设置值为1，同时与zoo.cfg文件里面的server.2保持一致，如下

echo “2” > /usr/local/zookeeper/data/myid

#在192.168.xx.130服务器上面创建myid文件，并设置值为1，同时与zoo.cfg文件里面的server.3保持一致，如下

echo “3” > /usr/local/zookeeper/data/myid

到此 配置结束

然后 同时进入 /usr/zookeeper-3.3.6/bin/ 目录下  启动 ./zkServer.sh start

JMX enabled by default Using config: /usr/zookeeper-3.3.6/bin/../conf/zoo.cfg Starting zookeeper ... STARTED [root@node0 zookeeper-3.4.6]$ ./bin/**zkServer.sh status** JMX enabled by default Using config: /usr/zookeeper-3.6.6/bin/../conf/zoo.cfg Error contacting service. It is probably not running.zkServer.sh status

JMX enabled by default

Using config: /usr/zookeeper-3.6.6/bin/…/conf/zoo.cfg

Error contacting service. It is probably not running.

start 正常，但是查看状态时，出现如下错误：

Error contacting service. It is probably not running.

停掉ZK,然后以start-foreground方式启动,查看启动日志：

即：zkServer.sh start-foreground ，又出现如下错误：

1. java.net.BindException: 地址已在使用

2. at sun.nio.ch.Net.bind0(Native Method)

3. at sun.nio.ch.Net.bind(Net.java:463)

4. at sun.nio.ch.Net.bind(Net.java:455)

5. at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)

6. at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)

7. at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)

8. at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:90)

9. at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:130)

10. at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)

11. at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)

从错误信息来看，是

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端口被使用了，但我用netstat -lntup是没被使用的，再用 lsof -i:2181，发现了2181端口果然被占用了

[root@ programfiles]# lsof -i:2181

是java的一个进程 占用了端口（这里忘了截图了）。

再次修改 conf/zoo.cfg 将端口号 2181 修改为 21810，重新启动

java.net.NoRouteToHostException: 没有到主机的路由

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:712)

at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:111)

at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)

at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)

at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)

at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)

又出现了如下错误，真是一部一个坑。

检查了一下防火墙的状态，将其关闭：

centos7.0(默认是使用firewall作为防火墙，如若未改为iptables防火墙，使用以下命令查看和关闭防火墙)

查看防火墙状态：firewall-cmd --state

关闭防火墙：systemctl stop firewalld.service

重新启动：

zkServer.sh start-foreground

java.net.ConnectException: 拒绝连接

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:712)

at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:111)

at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:371)

at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:404)

at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:688)

at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:622)

竟然还有错误？！！百度到一片文章，后说需要修改   /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

将第一行注释掉，再次启动：

zkServer.sh start

启动成功！查看一下 状态

zkServer.sh status

[root@localhost bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/zookeeper-3.3.6/bin/../conf/zoo.cfg Mode: followerfollower

[root@localhost bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/zookeeper-3.3.6/bin/../conf/zoo.cfg Mode: leaderleader

[root@localhost bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/zookeeper-3.3.6/bin/../conf/zoo.cfg Mode: followerfollower

至此，zookeeper集群搭建完毕，感觉所有的坑全踩了一遍。对于一个刚刚接触linux 不久的菜鸟来说真的很残忍。希望能够帮到大家！
问题最后解决看的是这篇文章，http://blog.csdn.net/pein_zero/article/details/51855244