#解压压缩包
tar -xvf  mysql-8.0.20-1.el7.x86_64.rpm-bundle.tar 

#安装Common
rpm -ivh mysql-community-common-8.0.21-1.el7.x86_64.rpm --nodeps --force

#安装lib
rpm -ivh mysql-community-libs-8.0.21-1.el7.x86_64.rpm

#如果遇到error: Failed dependencies: mariadb-libs is obsoleted by mysql-community-libs-8.0.21-1.el7.x86_64，清除之前安装过的依赖mysql-libs
yum remove mysql-libs

#安装client
rpm -ivh mysql-community-client-8.0.21-1.el7.x86_64.rpm

#安装server
rpm -ivh mysql-community-server-8.0.21-1.el7.x86_64.rpm

#如果遇到error: Failed dependencies:libaio.so.1()(64bit) is needed by mysql-community-server... 需要安装libaio.so依赖
yum install -y libaio

#初始化数据库
mysqld --initialize
#设置文件所有者和文件关联组，拥有者皆设为mysql，群体的使用者mysql
chown mysql:mysql -R /var/lib/mysql 

#启动mysql
systemctl start mysqld

#查看mysql状态
systemctl status  mysqld

#停止mysql
systemctl stop mysqld

#服务自启
systemctl enable mysqld

#启动mysql，并设置自启
systemctl enable mysqld --now

#修改mysql配置文件，当然我们也可以提前备份一下这个文件，以后方便恢复
vim /etc/my.cnf

#For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html

[mysql] #设置客户端
# 设置mysql客户端默认字符集
#default-character-set=utf8mb4

[mysqld] #设置服务端
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove the leading "# " to disable binary logging
# Binary logging captures changes between backups and is enabled by
# default. It's default setting is log_bin=binlog
# disable_log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
#
# Remove leading # to revert to previous value for default_authentication_plugin,
# this will increase compatibility with older clients. For background, see:
# https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin
# default-authentication-plugin=mysql_native_password


#设置端口号，默认3306
#port=3306

# 设置mysql的安装目录
#basedir=/usr/local/mysql

# 设置mysql数据库的数据的存放目录
datadir=/usr/local/mysql/data
socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

# 允许最大连接数
# max_connections=500

# 服务端使用的字符集默认为8比特编码的latin1字符集
#character-set-server=utf8mb4

# 创建新表时将使用的默认存储引擎
#default-storage-engine=INNODB
#lower_case_table_names=1
#max_allowed_packet=16M


#跳过密码验证，之后会有获取密码的方式，如果找不到密码可以先设置跳过密码验证，改过密码后再注释掉
#skip-grant-tables

#设置performance_schema_max_table_instances 默认情况下为12500(修改后减少的内存占用很少)
#performance_schema_max_table_instances=150

#设置table_definition_cache默认情况下为2000(修改后减少内存明显)
#table_definition_cache=400

#设置table_open_cache默认情况下为4000(修改后减少的内存占用很少)
#table_open_cache=2000

#设置innodb_buffer_pool_size默认情况下为128M(修改后减少内存不明显,减少5M左右)
#innodb_buffer_pool_size=64M

#获取初始密码，这样我们就可以登录了
grep password /var/log/mysqld.log

#先登录mysql客户端，输入密码不会显示
mysql -uroot -p


#设置密码
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

#重新加载权限表
flush privileges;


#开启远程登录的密码
create user 'root'@'%' identified with mysql_native_password by '123456'; 

#重新加载权限表
flush privileges;


#赋权命令 以下命令二选一 
# all privileges 当前用户所有权限 
# *.*赋予所有权限 
# with grant option允许级联赋权

#1.任何主机访问都可以连接 '%'
grant all privileges on *.* to 'root'@'%' with grant option;

#2.指定主机访问可连接
grant all privileges on *.* to 'root'@'192.168.1.102' with grant option;

#重新加载权限表
flush privileges;

#开放3306端口 
#zone=public代表公开空间 外部可访问
# --permanent表示永久有效
firewall-cmd --zone=public --add-port=3306/tcp --permanent

#重载防火墙
firewall-cmd --reload

#查看开放的防火墙
firewall-cmd --zone=public --list-ports