linux上安装mysql

CentOS7上安装MySQL5.7.17

http://www.cnblogs.com/starof/p/4680083.html
http://www.centoscn.com/mysql/2016/0315/6844.html
CentOS 7 版本将MySQL数据库软件从默认的程序列表中移除，用mariadb代替了

# 下载mysql的Yum源   https://dev.mysql.com/downloads/  -->  MySQL Yum Repository
curl -o ~/mysql/mysql57-community-release-el7-9.noarch.rpm https://repo.mysql.com/mysql57-community-release-el7-9.noarch.rpm
# 将mysql的yum源添加到系统中
yum localinstall ~/mysql/mysql57-community-release-el7-9.noarch.rpm
# 验证下是否添加成功
yum repolist enabled | grep "mysql.*-community.*"

# 查看 MySQL 版本
yum repolist all | grep mysql
# 启用或禁用某版本
yum-config-manager --disable mysql56-community
yum-config-manager --enable mysql57-community-dmr
# 查看当前的启用的 MySQL 版本
yum repolist enabled | grep mysql

# 通过 Yum 来安装 MySQL
yum -y install mysql-community-server
# 查看mysql安装目录
whereis mysql

# 启动 MySQL Server
systemctl start mysqld
# 查看 MySQL Server 状态
systemctl status mysqld
# 关闭 MySQL Server
systemctl stop mysqld

# 重置root密码: http://blog.csdn.net/praying2/article/details/54312776
# 在/etc/my.cnf最后添加一行skip-grant-tables
echo "skip-grant-tables" >> /etc/my.cnf
systemctl restart mysqld
mysql
use mysql;
# update user set password=PASSWORD('root') where User='root'; #5.7.5 之前
#5.7.6以上
update user set authentication_string=PASSWORD('root') where User='root';
exit
# 删除/etc/my.cnf最后一行的skip-grant-tables
sed -i '$d' /etc/my.cnf
systemctl restart mysqld
# 使用root带密码登录
mysql -u root  -p
# 修改密码：http://www.cnblogs.com/ivictor/p/5142809.html
# 显示validate_password插件， MySQL5.7默认安装
SHOW VARIABLES LIKE 'validate_password%';
set global validate_password_policy=0;
set global validate_password_mixed_case_count=0;
set global validate_password_number_count=0;
set global validate_password_special_char_count=0;
set global validate_password_length=0;
# 经过上面的设置0，此时，才可以将配置为空的
SET PASSWORD = PASSWORD('');

# 配置允许远程连接
mysql
use mysql;
update user set host = '%' where user = 'root';
flush privileges;
exit
# 开放默认端口号 3306
firewall-cmd --permanent --zone=public --add-port=3306/tcp
firewall-cmd --permanent --zone=public --add-port=3306/udp
firewall-cmd --reload

# MySQL 安全设置   不需要
# mysql_secure_installation

# 设置字符集
mysql
# character_set_database
SHOW VARIABLES LIKE 'character%';
exit
vi /etc/my.cnf
# [mysqld]   
# character_set_server = utf8
# [mysql]
# default-character-set = utf8