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记录一次mysql启动失败问题解决

news 2025/9/20 8:23:00

1.按照正常查询没有找到日志

2.系统日志找到错误信息

grep "mysqld" /var/log/messages

错误信息如下

Sep 19 17:01:02 VM-4-3-centos mysqld[674712]: Starting MySQL SUCCESS!
Sep 19 17:01:02 VM-4-3-centos mysqld[674720]: 2025-09-19T09:01:02.994965Z mysqld_safe A mysqld process already exists
Sep 19 17:01:02 VM-4-3-centos systemd[1]: mysqld.service: Main process exited, code=exited, status=1/FAILURE
Sep 19 17:01:02 VM-4-3-centos systemd[1]: mysqld.service: Failed with result 'exit-code'.
Sep 19 17:01:07 VM-4-3-centos mysqld[675333]: Starting MySQL SUCCESS!
Sep 19 17:01:08 VM-4-3-centos mysqld[675341]: 2025-09-19T09:01:08.307529Z mysqld_safe A mysqld process already exists
Sep 19 17:01:08 VM-4-3-centos systemd[1]: mysqld.service: Main process exited, code=exited, status=1/FAILURE
Sep 19 17:01:08 VM-4-3-centos systemd[1]: mysqld.service: Failed with result 'exit-code'.
[root@VM-4-3-centos mysql]# ps aux | grep mysqld | grep -v grep

错误信息贴给豆包,豆包

豆包反馈:

从日志信息来看，核心错误是 A mysqld process already exists（已经存在一个 mysqld 进程），这导致新的 MySQL 服务启动失败。这通常是因为之前的 MySQL 进程没有正常关闭，残留的进程占用了端口或资源，导致新进程无法启动。

豆包让执行下面的命令,并杀掉查询到的进程

ps aux | grep mysqld | grep -v grep

我的执行结果:

[root@VM-4-3-centos mysql]# ps aux | grep mysqld | grep -v grep
root     2115753  0.0  0.1   7400  3872 ?        S    Sep16   0:00 /bin/sh /www/server/mysql/bin/mysqld_safe --defaults-file=/etc/my.cnf --datadir=/www/server/data --pid-file=/www/server/data/VM-4-3-centos.pid
mysql    2116347  0.0  7.3 2060092 276680 ?      Sl   Sep16   1:57 /www/server/mysql/bin/mysqld --defaults-file=/etc/my.cnf --basedir=/www/server/mysql --datadir=/www/server/data --plugin-dir=/www/server/mysql/lib/plugin --user=mysql --log-error=VM-4-3-centos.err --open-files-limit=65535 --pid-file=/www/server/data/VM-4-3-centos.pid --socket=/tmp/mysql.sock --port=3306
[root@VM-4-3-centos mysql]# kill -9 2115753 2116347

杀掉之后重新启动mysql成功

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