Starting MySQL. ERROR! The server quit without updating PID file (/software/install/mysql/data/hadoop01.pid).

根据引用内容和，可以看出，启动MySQL服务的命令是"service mysql start"，关闭MySQL服务的命令是"service mysql stop"，重启MySQL服务的命令是"service mysql restart"。所以，如果出现"Starting MySQL. ERROR! The server quit without updating PID file"的错误提示，可能是由于MySQL的PID文件没有正确更新导致的。

根据引用内容，可能是由于"/software/install/mysql/data/hadoop01.pid"文件没有写权限所致。解决方法是使用"chown -R mysql:mysql /var/data"命令为该文件添加权限，并使用"chmod -R 755 /usr/local/mysql/data"命令重新启动mysqld服务。

请尝试执行上述解决方法后重新启动MySQL服务，看是否可以解决该错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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