Zookeeper - Zookeeper启动失败，日志报错 Missing election port for server: 2

Missing election port for server: 2

【整理日期】2023年6月1日

【基础环境】JDK 1.8.0_372、Zookeeper 3.4.5

【问题描述】进行部署分布式，配置了myid、zoo.cfg等文件之后，执行 bin/zkServer.sh start 启动 Zookeeper服务，发现无法启动Zookeeper服务

# 一般习惯用restart来启动一个服务, 如果当前服务已经是运行状态，直接start可能会失败
[root@node01 zookeeper-3.4.5]# bin/zkServer.sh restart
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
# 这一段说没有运行着的zookeeper
Stopping zookeeper ... no zookeeper to stop (could not find file /opt/module/zookeeper-3.4.5/zkData/zookeeper_server.pid)
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@node01 zookeeper-3.4.5]#
[root@node01 zookeeper-3.4.5]#
# 然后检查zookeeper服务的状态
[root@node01 zookeeper-3.4.5]# bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
# 发现服务是未运行状态
Error contacting service. It is probably not running.
[root@node01 zookeeper-3.4.5]#

【报错详情】检查了 /opt/module/zookeeper-3.4.5/zookeeper.out文件，发现如下报错

2023-06-01 13:43:38,488 [myid:] - INFO  [main:QuorumPeerConfig@101] - Reading configuration from: /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
2023-06-01 13:43:38,508 [myid:] - ERROR [main:QuorumPeerMain@85] - Invalid config, exiting abnormally
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
        at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:121)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:101)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
Caused by: java.lang.IllegalArgumentException: Missing election port for server: 2
        at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parseProperties(QuorumPeerConfig.java:305)
        at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:117)
        ... 2 more
Invalid config, exiting abnormally

【问题处理】

网上百度了一下，发现是 /opt/module/zookeeper-3.4.5/conf/zoo.cfg 配置错了，配置文件中写的是：

# =================cluster=================
server.1=node01:2888:3888
server.2=node02.2888:3888
server.3=node03:2888:3888

正确的应该是这样

# =================cluster=================
server.1=node01:2888:3888
server.2=node02:2888:3888
server.3=node03:2888:3888

修改之后，执行 bin/zkServer.sh restart启动zookeeper后，查看服务状态

# node01
[root@node01 bin]# ./zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: follower
[root@node01 bin]#

# node02
[root@node02 bin]# ./zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: follower
[root@node02 bin]#

# node03
[root@node03 bin]# ./zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: leader
[root@node03 bin]#

EOF