1.阿里云ECS安装ZooKeeper

由于参加了阿里云推荐有礼活动，买了一台阿里云云服务器ECS。

JDK安装完成后首先安装的是ZooKeeper3.4.10，由于是一台机器，使用的是伪分布式安装，参见ZooKeeper伪分布式环境搭建及命令行使用

但是ZooKeeper安装配置完成后，启动却报错，报错日志如下，其中*.*.*.*表示外网IP地址，solang表示设置的外网IP和主机名的映射

2018-04-09 14:11:56,122 [myid:1] - INFO  [solang/*.*.*.*:3887:QuorumCnxManager$Listener@739] - My election bind port: solang/*.*.*.*:3887
2018-04-09 14:11:56,123 [myid:1] - ERROR [solang/*.*.*.*:3887:QuorumCnxManager$Listener@763] - Exception while listening
java.net.BindException: Cannot assign requested address (Bind failed)
    at java.net.PlainSocketImpl.socketBind(Native Method)
    at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:387)
    at java.net.ServerSocket.bind(ServerSocket.java:375)
    at java.net.ServerSocket.bind(ServerSocket.java:329)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager$Listener.run(QuorumCnxManager.java:742)
2018-04-09 14:11:57,123 [myid:1] - INFO  [solang/*.*.*.*:3887:QuorumCnxManager$Listener@776] - Leaving listener
2018-04-09 14:11:57,124 [myid:1] - ERROR [solang/*.*.*.*:3887:QuorumCnxManager$Listener@778] - As I'm leaving the listener thread, I won't be able to participate in leader election any longer: solang/*.*.*.*:3887
2018-04-09 14:11:59,140 [myid:1] - WARN  [WorkerSender[myid=1]:QuorumCnxManager@588] - Cannot open channel to 2 at election address solang/*.*.*.*:3888
java.net.SocketTimeoutException: connect timed out
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:562)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:538)
    at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:452)
    at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:433)
    at java.lang.Thread.run(Thread.java:748)

将云服务器的/etc/hosts文件外网IP地址修改为内网IP地址，或者ZooKeeper配置文件的地址修改为localhost，重新启动ZooKeeper，这样ZooKeeper能正常启动。

[solang@solang ~]$ vi /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

172.19.83.240 solang

但是外部机器使用ECS外网IP就不能连接操作ZooKeeper了，解决方案见下

2.阿里云ECS外网不能连接访问ZooKeeper解决

1.进入阿里云ECS实例控制台

2.选择更多-安全组配置

3.选择配置规则

4.选择添加安全组规则

5.添加安全组规则

可根据需要选择协议类型及设置对应端口范围，为了省事，我选择协议类型为全部。点击确定，安全组规则设置完成。

这样Windows或MAC机器就能使用ECS提供的外网IP访问到ZooKeeper了。

3.解决使用外网IP和主机名的映射ZooKeeper启动报错

使用外网IP和主机名映射的配置会报最开始的错误，解决方案如下:

1.ZooKeeper的配置文件zoo.cfg要加参数quorumListenOnAllIPs=true

2.需要进入ECS控制台配置安全组规则，伪分布式ZooKeeper使用到的端口都需要在规则内

设置完成后启动ZooKeeper，发现启动成功，而且Windows或MAC机器也能使用ECS提供的外网IP访问到ZooKeeper了。

本文参考:
解决阿里云服务器只能内网访问，外网访问不了
zookeeper集群无法正确启动