解决 Starting MySQL ERROR The server quit without updating PID file

服务器断电重启后mysql启动报错，记录一下解决方案

环境
mysql版本 5.7.21
服务器 Red Hat Enterprise Linux Server release 7.6 (Maipo)

# myslq启动报错
Starting MySQL.. ERROR! The server quit without updating PID file.

首先查看错误日志，注意到在redo log里找不到checkpoint点，innodb引擎启动失败

# 查看/etc/my.cnf下datadir配置的目录
cd /usr/local/mysql/data
# 目录下有一个主机名.err文件
view hostname.err

2022-01-12T05:56:36.174273Z 0 [ERROR] InnoDB: Ignoring the redo log due to missing MLOG_CHECKPOINT between the checkpoint 261550117271 and the end 261550116864.
2022-01-12T05:56:36.174285Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2022-01-12T05:56:36.787768Z 0 [ERROR] Plugin 'InnoDB' init function returned error.
2022-01-12T05:56:36.787839Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2022-01-12T05:56:36.787854Z 0 [ERROR] Failed to initialize builtin plugins.
2022-01-12T05:56:36.787878Z 0 [ERROR] Aborting2022-01-12T05:56:36.787905Z 0 [Note] Binlog end
2022-01-12T05:56:36.788857Z 0 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete

按照网上说的，把所有ib_logfile*文件删除，再启动mysql，能够顺利启动，由于是测试环境，所以能跑起来就行了，数据丢了也无所谓，如果是生产环境还需谨慎操作。

# 在/usr/local/mysql/data目录下有两个ib_logfile文件ib_logfile0和ib_logfile1
rm -rf ./ib_logfile*
# 重新启动mysql
service mysqld start

推荐的做法是在my.cnf里设置innodb_force_recovery=1 ，如果1不行改成2，最大是6 ，然后启动mysql，将数据dump出来，再导入到新的实例，这种方法我没试过，仅记录一下。

vi /etc/my.cnf
#将下面参数设置为1
innodb_force_recovery=1
#保存后重启mysql
service mysqld start

根据主键id ，逐个区间去导出，用mysqldump -w where条件，再导入到新实例，
innodb_force_recovery影响整个innodb存储引擎的恢复状况，该值默认为0，表示当需要恢复时，需要执行所有的恢复操作，当不能进行有效恢复时，如数据页发生了corruption，mysql数据库可能宕机，并把错误写入错误日志中。
innodb_force_recovery=6表示mysql数据库已经有比较严重的损坏，就算把数据dump出来也不能保证dump出来的数据是没有问题的

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解决 Starting MySQL ERROR The server quit without updating PID file

服务器断电重启后mysql启动报错，记录一下解决方案

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