第一次在Centos上安裝mysql遇到的一些問題。

第一步就遇到問題，安裝mysql-server報錯沒有可用包。

【解決方法】

先要安裝mysql

# wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

# rpm -ivh mysql-community-release-el7-5.noarch.rpm

之后再安裝mysql-server

# yum -y install mysql-server

然后systemctl enable mysqld設置mysql自啟動 之后systemctl start mysqld這時候出問題了，運行之后一直卡著沒有反應，如下

[root@localhost ~]# systemctl start mysqld

Redirecting to /bin/systemctl start mysql.service

systemctl status mysqld查看mysql服務的狀態如下

[root@localhost sbin]# systemctl status mysqld

● mysqld.service - MySQL Community Server

Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)

Active: activating (start-post) since 一 2017-05-15 17:04:12 CST; 5min ago

Process: 981 ExecStart=/usr/bin/mysqld_safe --basedir=/usr (code=exited, status=0/SUCCESS)

Process: 938 ExecStartPre=/usr/bin/mysql-systemd-start pre (code=exited, status=0/SUCCESS)

Main PID: 981 (code=exited, status=0/SUCCESS); : 982 (mysql-systemd-s)

CGroup: /system.slice/mysqld.service

└─control

├─ 982 /bin/bash /usr/bin/mysql-systemd-start post

└─2315 sleep 1

5月 15 17:04:12 localhost.localdomain systemd[1]: Starting MySQL Community Server...

5月 15 17:04:15 localhost.localdomain mysqld_safe[981]: 170515 17:04:15 mysqld_safe Logging to '/var/lo...g'.

5月 15 17:04:15 localhost.localdomain mysqld_safe[981]: 170515 17:04:15 mysqld_safe Starting mysqld dae...sql

Hint: Some lines were ellipsized, use -l to show in full.

看不出問題，查看mysql的日志終于找到問題vim /var/log/mysqld.log

2017-05-14 16:40:16 0 [Note] Binlog end

170514 16:40:16 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

170515 17:04:15 mysqld_safe Logging to '/var/log/mysqld.log'.

170515 17:04:15 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

2017-05-15 17:04:18 0 [ERROR] /usr/sbin/mysqld: ambiguous option '--character-set=utf8' (character-set-client-handshake, character_sets_dir)

2017-05-15 17:04:18 0 [ERROR] Aborting

原來是my.cnf文件中設置默認字符編碼我寫成character-set=ut8而centos7版本中應該設置為default-character-set=utf8

之后繼續啟動mysql仍然無法啟動，查看日志如下

2017-05-15 17:14:21 1195 [Warning] Buffered warning: Changed limits: table_open_cache: 431 (requested 2000)

2017-05-15 17:14:21 1195 [Note] Plugin 'FEDERATED' is disabled.

/usr/sbin/mysqld: Table 'mysql.plugin' doesn't exist

2017-05-15 17:14:21 1195 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.

2017-05-15 17:14:21 1195 [Note] InnoDB: Using atomics to ref count buffer pool pages

2017-05-15 17:14:21 1195 [Note] InnoDB: The InnoDB memory heap is disabled

2017-05-15 17:14:21 1195 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2017-05-15 17:14:21 1195 [Note] InnoDB: Memory barrier is not used

2017-05-15 17:14:21 1195 [Note] InnoDB: Compressed tables use zlib 1.2.3

2017-05-15 17:14:21 1195 [Note] InnoDB: Using Linux native AIO

2017-05-15 17:14:21 1195 [Note] InnoDB: Not using CPU crc32 instructions

2017-05-15 17:14:21 1195 [Note] InnoDB: Initializing buffer pool, size = 128.0M

170515 17:04:18 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

注意ERROR

Can’t open the mysql.plugin table. Please run mysql_upgrade to create it.

【解決方法】

在運行初始化權限表的時候使用增加參數–datadir

mysql_install_db –user=mysql –datadir=/usr/local/mysql/var

百度后

安裝完mysql server時，一般要執行這個腳本對數據庫初始化。 運行這個腳本，會初始化mysql的data目錄，并且創建那些系統表。

同樣也會初始化系統表空間并且關聯innodb表與數據結構。

更多的相關可以點擊這里查看

之后啟動服務依然卡住，回看前面執行命令之后的提示

Alternatively you can run:

/usr/bin/mysql_secure_installation

即執行MySQL安全配置向導mysql_secure_installation

安裝完mysql-server 會提示可以運行mysql_secure_installation。運行mysql_secure_installation會執行幾個設置：

a)為root用戶設置密碼

b)刪除匿名賬號

c)取消root用戶遠程登錄

d)刪除test庫和對test庫的訪問權限

e)刷新授權表使修改生效

執行之后systemctl restart mysqld命令可以正常執行了

可以正常啟動登錄mysql

總結

以上是生活随笔為你收集整理的centos7不能安装mysql数据库_Centos7 上安装mysql遇上的问题：mysql无法正常启动-Go语言中文社区...的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。