Centos安裝Mysql記錄

安裝

# 下載yum源
wget 'https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm'

# 安裝yum源
sudo rpm -Uvh mysql57-community-release-el7-11.noarch.rpm

# 查看有哪些版本可安裝
yum repolist all | grep mysql

# 切換安裝版本
# 關閉5.7版本
sudo yum-config-manager --disable mysql57-community
# 打開5.6版本
sudo yum-config-manager --enable mysql56-community

# 安裝
sudo yum install mysql-community-server

在centos6下會報如下錯誤：（centos7正常）

Error: Package: mysql-community-server-5.6.48-2.el7.x86_64 (mysql56-community)
           Requires: libc.so.6(GLIBC_2.17)(64bit)
Error: Package: mysql-community-server-5.6.48-2.el7.x86_64 (mysql56-community)
           Requires: systemd
Error: Package: mysql-community-libs-5.6.48-2.el7.x86_64 (mysql56-community)
           Requires: libc.so.6(GLIBC_2.17)(64bit)
Error: Package: mysql-community-server-5.6.48-2.el7.x86_64 (mysql56-community)
           Requires: libstdc++.so.6(GLIBCXX_3.4.15)(64bit)
Error: Package: mysql-community-client-5.6.48-2.el7.x86_64 (mysql56-community)
           Requires: libc.so.6(GLIBC_2.17)(64bit)

原因分析如下：
https://unix.stackexchange.com/questions/280385/can-not-install-mysql-server-on-centos-6-7-32bit-error-need-rpm

在網上找了一圈，按照下面一頓操作，發現能夠正常安裝成功

# cd /etc/yum.repos.d/  找到mysql-56-community,將enable置爲0 enable=0
sudo vi mysql-community.repo

# 重新安裝mysql   
sudo yum install mysql-server

在centos6上安裝完後，發現由於網絡安全原因，機器無法開3306端口；索性換了一臺centos7的機器，直接一氣呵成安裝MySQL8.0

基本操作

# 查看mysql運行狀態
sudo service mysqld status
# 查看端口情況
sudo lsof -i tcp:3306
# 啓動mysql，需要加sudo，否則會報FAILED錯誤
sudo service mysqld start
# 結束服務
sudo service mysqld stop

修改密碼

首次安裝後查看默認密碼

[work@40-31-60 soft]$ sudo grep 'temporary password' /var/log/mysqld.log
2020-05-21T09:56:30.576083Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: UlCbRjdoE4?a

默認情況下Mysql是不運行遠程連接的，故需要新增遠程連接賬戶

# 連接數據庫（輸入上面查詢出來的密碼）
mysql -u root -p

修改密碼

# 8.0下報錯
mysql> set password for root@localhost = password('root');
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'password('root')' at line 1

# 修改密碼(數字、大小寫、特殊字符)
alter user 'root'@'localhost' identified by '58daojiaDJ!!';
# 密碼複雜度過低會報如下錯誤
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

# 查看密碼強度規則
 mysql>  SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password.check_user_name    | ON     |
| validate_password.dictionary_file    |        |
| validate_password.length             | 8      |
| validate_password.mixed_case_count   | 1      |
| validate_password.number_count       | 1      |
| validate_password.policy             | MEDIUM |
| validate_password.special_char_count | 1      |
+--------------------------------------+--------+
7 rows in set (0.01 sec)

添加賬戶

查看現有用戶

# 選擇數據庫
mysql> use mysql;
# 用戶查詢
mysql> select host,user from user;
+-----------+------------------+
| host      | user             |
+-----------+------------------+
| localhost | mysql.infoschema |
| localhost | mysql.session    |
| localhost | mysql.sys        |
| localhost | root             |
+-----------+------------------+
4 rows in set (0.00 sec)

新增允許遠程連接的賬戶

# 新增用戶；[admin'@'%]中的%號代表允許任意遠程客戶端連接
mysql> CREATE USER 'admin'@'%' IDENTIFIED BY '58admin!!AAA';
# 添加權限
mysql> GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%';

其他

爲work賬戶添加sudo權限

root 賬戶鍵入visudo即可進入sudo配置
找到root ALL=(ALL) ALL
在這一行下面增加work ALL=(ALL) NOPASSWD:ALL即可