Zookeeper 端口说明

Posted 2023-04-18

参考技术A 1、2181：对cline端提供服务

2、3888：选举leader使用

3、2888：集群内机器通讯使用（Leader监听此端口）

1、单机单实例，只要端口不被占用即可

2、单机伪集群（单机，部署多个实例），三个端口必须修改为组组不一样

如：myid1 : 2181,3888,2888

myid2 : 2182,3788,2788

myid3 : 2183,3688,2688

3、集群（一台机器部署一个实例）

#配置集群

server.l=master:2888:3888

server.2=slaver1:2888:3888

server.3=slaver2:2888:3888

server.A=B.:C:D

A:表示一个数字，这个数字表示第几个服务器，配置在myid的文件

B:服务器地址，也就是ip地址

C:本台服务器与集群中的lender服务器交换信息端口

D:万一leader挂了就需要这个端口重新选举

4.集群最少要几台机器

集群规则是怎样的集群规则为2N+1台，N>0，即3台。

zookeeper集群搭建Exception when following the leader java.io.EOFException

zk配置后集群选举失败，集群中全部无法进行选举，但是应用又起来了。

先讲原因：后经人指点，server的端口配置错误导致。server占用了client的端口号导致的。说明server.1=127.0.0.1:2181:3181中2181是server端口但是我又配置了clientPort=2181.把server端口和client端口混为一谈导致的（汗颜并吐槽：zk既然配置错误了，就不应该让项目启动成功，应该直接停止程序或者直接报错）。

修改zoo.cnf中集群错误配置：

server.1=127.0.0.1:2181:3181
server.2=127.0.0.1:2182:3182
server.3=127.0.0.1:2183:3183

为正确配置：

server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3899
server.3=127.0.0.1:2890:3890

 

附件：

Exception when following the leader
java.io.EOFException

线上异常截图：

 

 

 

用zkServer.sh status的状态命令查看如下：

 

 

 

错误配置文件：

# 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=D:/Dev/data/zookeeper/z1
# the port at which the clients will connect
clientPort=2181
# 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

## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true
server.1=127.0.0.1:2181:3181
server.2=127.0.0.1:2182:3182
server.3=127.0.0.1:2183:3183

正确配置：

# 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=D:/Dev/data/zookeeper/z1
# the port at which the clients will connect
clientPort=2181
# 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

## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3899
server.3=127.0.0.1:2890:3890