centos7 安装 mysql 卡住了，输入： sudo systemctl start mysqld 后， 光标停在那里一动不动

[kmdd33]

参考的教程： https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-centos-7 https://linode.com/docs/databases/mysql/how-to-install-mysql-on-centos-7/

环境：cetnos7，openresty，已经安装好了 php7，infophp 也显示正常，之前安装了 mariadb，卸载了，现在安装 mysql5.5

执行命令的过程：

sudo yum install mysql-server

Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile

• base: mirror.atlanticmetro.net
• epel: fedora-epel.mirrors.tds.net
• extras: mirror.atlanticmetro.net
• ius: ius.mirror.constant.com
• remi-php70: mirror.team-cymru.org
• remi-php71: mirror.team-cymru.org
• remi-php72: mirror.team-cymru.org
• remi-safe: mirror.team-cymru.org
• updates: mirror.atlanticmetro.net
• webtatic: us-east.repo.webtatic.com Package mysql-community-server-5.5.59-2.el7.x86_64 already installed and latest version Nothing to do

sudo systemctl start mysqld

（输入这个命令后，光标就卡在这里了）

请问具体的解决方案？

[neighbads]

你不看日志的吗。。。

[kmdd33]

@neighbads 请问日志目录？

[defunct9]

开 ssh,我上去装

[kmdd33]

／ var/log/mysqld.log 的日志
@neighbads 不知道你指的是不是这个？



180415 10:39:22 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
180415 10:49:22 mysqld_safe Logging to '/var/log/mysqld.log'.
180415 10:49:22 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
180415 10:49:22 [Note] /usr/sbin/mysqld (mysqld 5.5.59) starting as process 13415 ...
180415 10:49:22 [Note] Plugin 'FEDERATED' is disabled.
180415 10:49:22 InnoDB: The InnoDB memory heap is disabled
180415 10:49:22 InnoDB: Mutexes and rw_locks use GCC atomic builtins
180415 10:49:22 InnoDB: Compressed tables use zlib 1.2.3
180415 10:49:22 InnoDB: Using Linux native AIO
180415 10:49:22 InnoDB: Initializing buffer pool, size = 128.0M
180415 10:49:22 InnoDB: Completed initialization of buffer pool
180415 10:49:22 InnoDB: highest supported file format is Barracuda.
180415 10:49:22 InnoDB: Waiting for the background threads to start
180415 10:49:23 InnoDB: 5.5.59 started; log sequence number 1597945
180415 10:49:23 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
180415 10:49:23 [Note] - '0.0.0.0' resolves to '0.0.0.0';
180415 10:49:23 [Note] Server socket created on IP: '0.0.0.0'.
180415 10:49:23 [ERROR] Incorrect definition of table mysql.event: expected column 'sql_mode' at position 14 to have type set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE','NO_ENGINE_SUBSTITUTION','PAD_CHAR_TO_FULL_LENGTH'), found type set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','IGNORE_BAD_TABLE_OPTIONS','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_A
180415 10:49:23 [ERROR] Event Scheduler: An error occurred when initializing system tables. Disabling the Event Scheduler.
180415 10:49:23 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.59' socket: '/var/lib/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL)

[wwqgtxx]

sudo journalctl -u mysqld

[kmdd33]

sudo journalctl -u mysqld
-- Logs begin at Wed 2018-04-11 00:59:13 UTC, end at Sun 2018-04-15 10:56:42 UTC. --
Apr 15 09:58:20 newoneacreland systemd[1]: Starting MySQL Community Server...
Apr 15 09:58:21 newoneacreland mysqld_safe[31839]: 180415 09:58:21 mysqld_safe Logging to '/var/log/mysqld.log'.
Apr 15 09:58:22 newoneacreland mysqld_safe[31839]: 180415 09:58:22 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Apr 15 10:08:21 newoneacreland systemd[1]: mysqld.service start-post operation timed out. Stopping.
Apr 15 10:08:21 newoneacreland systemd[1]: Failed to start MySQL Community Server.
Apr 15 10:08:21 newoneacreland systemd[1]: Unit mysqld.service entered failed state.
Apr 15 10:08:21 newoneacreland systemd[1]: mysqld.service failed.
Apr 15 10:08:22 newoneacreland systemd[1]: mysqld.service holdoff time over, scheduling restart.
Apr 15 10:08:22 newoneacreland systemd[1]: Starting MySQL Community Server...
Apr 15 10:08:22 newoneacreland mysqld_safe[2173]: 180415 10:08:22 mysqld_safe Logging to '/var/log/mysqld.log'.
Apr 15 10:08:23 newoneacreland mysqld_safe[2173]: 180415 10:08:23 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Apr 15 10:18:22 newoneacreland systemd[1]: mysqld.service start-post operation timed out. Stopping.
Apr 15 10:18:22 newoneacreland systemd[1]: Failed to start MySQL Community Server.
Apr 15 10:18:22 newoneacreland systemd[1]: Unit mysqld.service entered failed state.
Apr 15 10:18:22 newoneacreland systemd[1]: mysqld.service failed.
Apr 15 10:18:23 newoneacreland systemd[1]: mysqld.service holdoff time over, scheduling restart.
Apr 15 10:18:23 newoneacreland systemd[1]: Starting MySQL Community Server...
Apr 15 10:18:24 newoneacreland mysqld_safe[4906]: 180415 10:18:24 mysqld_safe Logging to '/var/log/mysqld.log'.
Apr 15 10:18:24 newoneacreland mysqld_safe[4906]: 180415 10:18:24 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Apr 15 10:28:23 newoneacreland systemd[1]: mysqld.service start-post operation timed out. Stopping.
Apr 15 10:28:23 newoneacreland systemd[1]: Failed to start MySQL Community Server.
Apr 15 10:28:23 newoneacreland systemd[1]: Unit mysqld.service entered failed state.
Apr 15 10:28:23 newoneacreland systemd[1]: mysqld.service failed.
Apr 15 10:28:24 newoneacreland systemd[1]: mysqld.service holdoff time over, scheduling restart.
Apr 15 10:28:24 newoneacreland systemd[1]: Starting MySQL Community Server...
Apr 15 10:28:24 newoneacreland mysqld_safe[7562]: 180415 10:28:24 mysqld_safe Logging to '/var/log/mysqld.log'.
Apr 15 10:28:25 newoneacreland mysqld_safe[7562]: 180415 10:28:25 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
lines 1-28...skipping...
-- Logs begin at Wed 2018-04-11 00:59:13 UTC, end at Sun 2018-04-15 10:56:42 UTC. --
Apr 15 09:58:20 newoneacreland systemd[1]: Starting MySQL Community Server...
Apr 15 09:58:21 newoneacreland mysqld_safe[31839]: 180415 09:58:21 mysqld_safe Logging to '/var/log/mysqld.log'.
Apr 15 09:58:22 newoneacreland mysqld_safe[31839]: 180415 09:58:22 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Apr 15 10:08:21 newoneacreland systemd[1]: mysqld.service start-post operation timed out. Stopping

@wwqgtxx

[kmdd33]

截图在这里，麻烦看下，谢谢 @wwqgtxx @neighbads @defunct9

[kmdd33]

/etc/my.cnf 的配置截图如上




/var/log/mysqld.log 的配置截图如上

@wwqgtxx @neighbads @defunct9

[f2f2f]

怎么印象里 centos7 并不支持 mysql 5.5 呀……

[LGB]

看错误日志。

[kmdd33]

/usr/local/openresty/nginx/logs/error.log



@LGB

[kmdd33]

[defunct9]

猜火车🚄

[kmdd33]

输入 sudo journalctl -xe -u mariadb.service
查看信息
然后输入：
/usr/bin/mysql_secure_installation
按照提示 输入 enter
然后输入 4 个 y
然后 sudo systemctl status mysqld
active 的状态
sudo systemctl start mysqld
成功

谢谢各位

[Beebird]

之前卸载的时候，恐怕没有移除 /var/lib/mysql，mariadb-server 和 mysql-server 是默认相同的 db 文件位置。

[zhazi]

我猜是磁盘满了

[venpong]

建议 lnmp 一键安装

[zhjits]

MySQL 启动日常
sudo systemctl start mysql --no-block; sudo journalctl -xefu mysql
这样一旦挂了你能知道发生了什么

[julyclyde]

@venpong 你那种一键安装是最容易出事的，因为你根本不知道它是咋运行的

[kmdd33]

@zhazi thanks

[keithszc]

想问一下，在 centos7 环境下，mariadb 和 mysql 有什么区别吗？
最近我刚好在弄个东西，卸了 mysql 装的 mariadb，一个在官方包里面，一个不在，但是用起来并没有什么区别。

[wizardoz]

其实 MySQL 这种应用最适合用 docker 跑了，避开操作系统兼容性问题和多版本共存问题。

[YumeMichi]

@keithszc madiadb 是 mysql 的社区版

[julyclyde]

@wizardoz mysql 这种东西，为什么会有多版本并存以及经常更换底层操作系统的需求？