Zookeeper合奏不会出现

Question

我正在尝试在documentation之后配置3个节点的集合。所有这些都在Linux Ubuntu上。在所有三个节点配置文件看起来像这样：

在$ ZOOKEEPER_HOME / conf下的zoo.cfg

tickTime=2000
dataDir=/home/zkuser/zookeeper_data
clientPort=2181
initLimit=5
syncLimit=2
server.1=ip.of.zk1:2888:3888
server.2=ip.of.zk2:2888:3888
server.3=ip.of.zk3:2888:3888

我还在myid目录下放置了各自的“/home/zkuser/zookeeper_data/”文件。这个myid文件包含1在节点（ip.of.zk1）上，依此类推。

当我使用bin / zkServer.sh启动zk服务器时，在控制台上没有显示任何异常。但是，当我打开bin目录下的zookeeper.out文件时，我看到以下错误。

2014-11-04 00:23:49,120 [myid:3] - WARN  [WorkerSender[myid=3]:QuorumCnxManager@382] - Cannot open channel to 1 at election address /ip.of.zk1:3888
java.net.NoRouteToHostException: No route to host
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:385)
    at java.net.Socket.connect(Socket.java:546)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:341)
    at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:449)
    at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:430)
    at java.lang.Thread.run(Thread.java:701)
2014-11-04 00:23:49,123 [myid:3] - WARN  [WorkerSender[myid=3]:QuorumCnxManager@382] - Cannot open channel to 2 at election address /ip.of.zk2:3888
java.net.ConnectException: Connection refused
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:385)
    at java.net.Socket.connect(Socket.java:546)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:341)
    at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:449)
    at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:430)
    at java.lang.Thread.run(Thread.java:701)

注意：我已经在每台机器上使用iptables打开了相应的端口。例如：Chain INPUT（policy ACCEPT）

target     prot opt source               destination         
ACCEPT     all  --  IP.of.ZK1       anywhere            
ACCEPT     all  --  IP.of.ZK2       anywhere            
ACCEPT     all  --  IP.of.ZK3       anywhere            

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination    

谁能告诉我我失踪了什么？

此致，JE

Answer 1

确保这件事：

• 您已在所有3台服务器上启动Zookeeper服务器
• 通过运行qazxsw poi，所有服务器都以非错误模式运行。如果打开，服务器应该回应qazxsw poi（仅供参考，这里是echo ruok | netcat ip.of.zk2 2181）
• imok分别包含每个服务器的值1/2/3
• 你可以从第一台服务器ping其他2台服务器

如果有兴趣，我创建了一个vagrant + ansible脚本来创建一个3节点虚拟Zookeeper集群，请参阅list of all supported 4-letter commands

Answer 2

我有一个类似的问题。我有一些关于问题可能来自/home/zkuser/zookeeper_data/myid和https://github.com/mkrcah/virtual-zookeeper-cluster的提示。在我的情况下，命令here的输出显示包括选举端口3888的here的东西。我已经通过更改服务器n上的zoo.cfg的一部分解决了这个问题

netstat -plutn

至

127.0.0.1:3888

ZooKeeper重新启动后，

server.1=name.of.s1:2888.3888
...
server.n=localhost:2888:3888
...

的输出包括

server.1=name.of.s1:2888.3888
...
server.n=0.0.0.0:2888:3888
...

。

显然，ZooKeeper需要正确公开选举端口，在本例中为3888。