如果启动失败，如下：

[root@centos8 bin]# ./zkServer.sh start
syncLimit=5
/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
syncLimit=5
Starting zookeeper ... FAILED TO START

看一下原因

[root@centos8 bin]# ./zkServer.sh start-foreground
/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Error: Could not find or load main class org.apache.zookeeper.server.quorum.QuorumPeerMain
Caused by: java.lang.ClassNotFoundException: org.apache.zookeeper.server.quorum.QuorumPeerMain

去看看你下载的源码包，是不是apache-zookeeper-[version].tar.gz?如果是！恭喜你，要费点功夫了，如果没时间，重新下载源码包，apache-zookeeper-[version]-bin.tar.gz

为什么呢？请看源码包里的README.md

Packaging/release artifacts

Either downloaded from https://zookeeper.apache.org/releases.html or
found in zookeeper-assembly/target directory after building the project with maven.

apache-zookeeper-[version].tar.gz

    Contains all the source files which can be built by running:
    mvn clean install

    To generate an aggregated apidocs for zookeeper-server and zookeeper-jute:
    mvn javadoc:aggregate
    (generated files will be at target/site/apidocs)

apache-zookeeper-[version]-bin.tar.gz

    Contains all the jar files required to run ZooKeeper
    Full documentation can also be found in the docs folder

As of version 3.5.5, the parent, zookeeper and zookeeper-jute artifacts
are deployed to the central repository after the release
is voted on and approved by the Apache ZooKeeper PMC:

https://repo1.maven.org/maven2/org/apache/zookeeper/zookeeper/

标签: zookeeper, zk无法启动, zk报错