亲测可用

在本地虚拟机上安装完zookeeper之后，java代码测试发布服务，总是报：

Opening socket connection to server 192.168.89.129/192.168.89.129:2181. Will not attempt to authenticate using SASL (unknown error)
2017-10-10 11:59:31,731  WARN [ClientCnxn.java:1102] : Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection timed out: no further information
 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
 at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
 at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

以下是相关配置信息：

java注册：

 <dubbo:registry protocol="zookeeper" address="192.168.89.129:2181" />

zoo.cfg:

[root@edu-provider-01 conf]# cat zoo.cfg
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/home/hll/zookeeper-3.4.6/data
dataLogDir=/home/hll/zookeeper-3.4.6/logs
# the port at which the clients will connect
clientPort=2181
server.1=edu-provider-01:2888:3888
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1
[root@edu-provider-01 conf]#

防火墙也加了过滤：

[root@edu-provider-01 conf]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination
1    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED
2    ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0
3    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
4    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:22
5    REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited
6    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:2181
7    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:2888
8    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:3888

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination
1    REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination

在网上查阅相关资料，大部分是说zookeeper对ip的支持比较弱，

需要用机器名来映射，更改本地hosts文件和服务端hosts文件，

加入映射：

#127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
#::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.89.129 edu-provider-01

还是报一样的错误。

随后在本地cmd窗口ping 192.168.89.129 通

ping edu-provider-01 也通

试着修改：<dubbo:registry protocol="zookeeper" address="edu-provider-01:2181" /> 还是不通

接着 本地telnet 192.168.89.129 2181 ，发现连接超时!

把服务器主机防火墙关闭后OK。基本上找到原因：配置防火墙过滤没有生效。

再继续找原因，发现防火墙配置有问题，需要accept的端口必须放在REJECT上面，才能生效，调整如下：

[root@localhost logs]# cat /etc/sysconfig/iptables
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
# -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT
#zookeeper
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2181 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2888 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3888 -j ACCEPT
#tomcat
-A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

重启防火墙，浏览器正常访问，搞定！