伺服器安裝mysql
阿新 • • 發佈：2022-04-15
1、解除安裝mysql
1.檢視是否安裝mysql
首先檢查是否已經安裝，如果已經安裝先刪除以前版本，以免安裝不成功
[root@localhost ~]# php -v
或
[root@localhost ~]# rpm -qa | grep mysql
或
[root@localhost ~]# yum list installed | grep mysql
如果顯示以下內容說明沒有安裝服務 -bash: gerp: command not found
如果有會顯示如下：
mysql57-community-release-el7-8.noarch
mysql-community-common-5.1.73-1.el7.x86_64
mysql-community-client-5.1.73-1.el7.x86_64
mysql-community-server-5.1.73-1.el7.x86_64
mysql-community-libs-5.1.73-1.el7.x86_64
mysql-community-libs-compat-5.1.73-1.el7.x86_64
這時就需要解除安裝這些安裝服務
[root@localhost ~]# rpm -e mysql57-community-release-el7-8.noarch
[root@localhost ~]# rpm -e mysql-community-common-5.1.73-1.el7.x86_64
[root@localhost ~]# rpm -e mysql-community-client-5.1.73-1.el7.x86_64
[root@localhost ~]# rpm -e mysql-community-server-5.1.73-1.el7.x86_64
[root@localhost ~]# rpm -e mmysql-community-libs-5.1.73-1.el7.x86_64
[root@localhost ~]# rpm -e mysql-community-libs-compat-5.1.73-1.el7.x86_64
2.刪除配置的mysql空間
-
先檢視my.cnf中配置的datadir，不要刪錯了檔案(預設為:/var/lib/mysql)
-
刪除datadir
rm -rf /var/lib/mysql/
-
刪除配置
rm /etc/my.cnf
3.檢查剩餘的mysql資訊
whereis mysql
-
比如像我的就還有如下資訊
mysql: /usr/bin/mysql /usr/lib64/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz
-
將搜尋出的mysql全都刪掉
-
檢視mysql依賴
systemctl list-dependencies mysqld
如果顯示只有
mysqld.service
這時就刪乾淨了！ 如果顯示像這樣，還得繼續刪
mysqld.service
● ├─system.slice
● └─basic.target
● ├─microcode.service
● ├─rhel-dmesg.service
● ├─[email protected]
● ├─paths.target
● ├─slices.target
● │ ├─-.slice
● │ └─system.slice
● ├─sockets.target
● │ ├─dbus.socket
● │ ├─systemd-initctl.socket
● │ ├─systemd-journald.socket
● │ ├─systemd-shutdownd.socket
● │ ├─systemd-udevd-control.socket
● │ └─systemd-udevd-kernel.socket
● ├─sysinit.target
● │ ├─dev-hugepages.mount
● │ ├─dev-mqueue.mount
● │ ├─kmod-static-nodes.service
● │ ├─plymouth-read-write.service
● │ ├─plymouth-start.service
● │ ├─proc-sys-fs-binfmt_misc.automount
● │ ├─rhel-autorelabel-mark.service
● │ ├─rhel-autorelabel.service
● │ ├─rhel-domainname.service
● │ ├─rhel-import-state.service
● │ ├─rhel-loadmodules.service
● │ ├─sys-fs-fuse-connections.mount
● │ ├─sys-kernel-config.mount
● │ ├─sys-kernel-debug.mount
4.mysql解除安裝完成
完成上面步驟，終於解除安裝完成！
2、安裝Mysql
1.確保伺服器系統處於最新狀態
[root@localhost ~]# yum -y update
如果顯示內容中含有
[root@localhost ~]# Complete!
說明更新完成
2.重啟伺服器（可選）
[root@localhost ~]# reboot
3.下載MySql安裝包
root@localhost ~]# rpm -ivh http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
或
[root@localhost ~]# rpm -ivh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
4.安裝MySql
[root@localhost ~]# yum install -y mysql-server
或
[root@localhost ~]# yum install mysql-community-server
如果顯示以下內容說明安裝成功
Complete!
5.修改mysql預設字符集
這裡我們需要設定成utf8，開啟my.cnf配置檔案
vi /etc/my.cnf
新增以下內容：
//在[mysqld]的下面新增服務端字符集
[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci
//lower_case_table_names預設為0,對錶名大小寫敏感;1不敏感
lower_case_table_names=1
//需要在最下方填寫客戶端字符集
[client]
default-character-set=utf8
6.設定開機啟動Mysql
[root@localhost ~]# systemctl enable mysqld.service
檢查是否開機自動啟動設定成功
[root@localhost ~]# systemctl list-unit-files | grep mysqld
如果顯示以下內容說明已經完成自動啟動安裝
mysqld.service enabled
7.設定開啟服務
[root@localhost ~]# systemctl start mysqld.service
或
[root@localhost ~]# service mysqld start
這裡需要在例項安全組配置規則，開啟3306埠
8.修改mysql登入密碼
設定mysql密碼，只要滿足六位的長度。
alter user 'root'@'localhost' identified by '123456';
9.授予遠端連線許可權(Navicat)
mysql> use mysql
mysql> select Host,User from user;
+-----------+------------------+
| Host | User |
+-----------+------------------+
| localhost | root |
| localhost | mysql.infoschema |
| localhost | mysql.session |
| localhost | mysql.sys |
+-----------+------------------+
4 rows in set (0.00 sec)
mysql> update user set host='%' where user = 'root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select Host,User from user;
+-----------+------------------+
| Host | User |
+-----------+------------------+
| % | root |
| localhost | mysql.infoschema |
| localhost | mysql.session |
| localhost | mysql.sys |
+-----------+------------------+
4 rows in set (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.22 sec)