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测试zookeeper集群搭建时，虽然启动结果显示了 STARTED，但是实际上zookeeper服务并没有启动，如下：

[root@db-7-52 bin]# sh /usr/local/zookeeper/zookeeper/bin/zkServer.sh start /usr/local/zookeeper/zkCluster/zk1/conf/zoo.cfg
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/zkCluster/zk1/conf/zoo.cfg
Starting zookeeper ... STARTED

虽然配置了日志目录，但是日志目录并没有输出任何日志。在网上查很多说在 zkServer.sh脚本的status选项的 nc命令后加上-q 1 参数可以输出，但是我的源码里并没有 nc 命令。

# zookeeper版本 3.4.14

status)
    # -q is necessary on some versions of linux where nc returns too quickly, and no stat result is output
    clientPortAddress=`$GREP "^[[:space:]]*clientPortAddress[^[:alpha:]]" "$ZOOCFG" | sed -e 's/.*=//'`
    if ! [ $clientPortAddress ]
    then
	clientPortAddress="localhost"
    fi
    clientPort=`$GREP "^[[:space:]]*clientPort[^[:alpha:]]" "$ZOOCFG" | sed -e 's/.*=//'`
    STAT=`"$JAVA" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \
             -cp "$CLASSPATH" $JVMFLAGS org.apache.zookeeper.client.FourLetterWordMain \
             $clientPortAddress $clientPort srvr 2> /dev/null    \
          | $GREP Mode`
    if [ "x$STAT" = "x" ]
    then
        echo "Error contacting service. It is probably not running."
        exit 1
    else
        echo $STAT
        exit 0
    fi
    ;;

偶然看到一篇文章，可以通过 start-foreground选项启动时输出日志。

[root@db-7-52 bin]# sh /usr/local/zookeeper/zookeeper/bin/zkServer.sh start-foreground /usr/local/zookeeper/zkCluster/zk1/conf/zoo.cfg start-foreground
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/zkCluster/zk1/conf/zoo.cfg
2022-07-12 19:54:10,736 [myid:] - INFO  [main:QuorumPeerConfig@136] - Reading configuration from: /usr/local/zookeeper/zkCluster/zk1/conf/zoo.cfg
2022-07-12 19:54:10,763 [myid:] - INFO  [main:QuorumPeer$QuorumServer@185] - Resolved hostname: 127.0.0.1 to address: /127.0.0.1
2022-07-12 19:54:10,763 [myid:] - INFO  [main:QuorumPeer$QuorumServer@185] - Resolved hostname: 127.0.0.1 to address: /127.0.0.1
2022-07-12 19:54:10,764 [myid:] - INFO  [main:QuorumPeer$QuorumServer@185] - Resolved hostname: 127.0.0.1 to address: /127.0.0.1
2022-07-12 19:54:10,765 [myid:] - ERROR [main:QuorumPeerMain@88] - Invalid config, exiting abnormally
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing /usr/local/zookeeper/zkCluster/zk1/conf/zoo.cfg
	at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:156)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:104)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)
Caused by: java.lang.IllegalArgumentException: initLimit is not set
	at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parseProperties(QuorumPeerConfig.java:357)
	at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:152)
	... 2 more
Invalid config, exiting abnormally

从输出可以看出是因为 initLimit is not set 导致的无法正常启动，在配置文件中配置好即可启动。

参考：https://blog.csdn.net/u011328843/article/details/84190285

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