早看到MySQL8發布， 性能相比MySQL7提升2倍，今天准備安裝下試試看
1、先卸載當前系統中已安裝的mariadb
rpm -qa | grep mariadb
rpm -e mysql*/mariadb*
rpm -e --nodeps mysql*/mariadb*
2、安裝mysql依賴包
yum install gcc gcc-c++ openssl openssl-devel libaio libaio-devel ncurses ncurses-devel
3、去mysql官網下載對應的版本，在此我下載的是64位的二進制版本
https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-8.0.11-linux-glibc2.12-x86_64.tar.gz
cd /home
wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-8.0.11-linux-glibc2.12-x86_64.tar.gz
4、解壓mysql壓縮包，創建mysql目錄，並COPY過去
tar -zxvf mysql-8.0.11-linux-glibc2.12-x86_64.tar.gz
mkdir /usr/local/mysql8
cp -r mysql-8.0.11-linux-glibc2.12-x86_64/* /usr/local/mysql8/
cd /usr/local/mysql8
mkdir data ----創建數據庫文件目錄
mkdir log ----創建日志目錄
5、創建mysql組和用戶
groupadd mysql
useradd -r -g mysql -s /bin/false mysql
chown -R mysql:mysql /usr/local/mysql8
6、配置/etc/my.cnf
[mysqld]
port=3306
datadir=/usr/local/mysql8/data
log-error=/usr/local/mysql8/log/mysql-err.log
user=mysql
default_authentication_plugin=mysql_native_password #此項是為了兼容當前的遠程連接工具可以連接
[client]
socket=/tmp/mysql.sock
7、配置環境變量
echo "export PATH=$PATH:/usr/local/mysql8/bin" >> /etc/profile
source /etc/profile
8、初始化數據庫
/usr/local/mysql8/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql8 --datadir=/usr/local/mysql8/data
初始化完成后，會自動為root帳戶生成一個初始密碼，要記錄下來
9、制作啟動文件
cp /usr/local/mysql8/support-files/mysql.server /etc/init.d/mysqld
vi /etc/init.d/mysqld
將basedir = 改為 basedir = /usr/local/mysql8
將datadir = 改為 datadir = /usr/local/mysql8/data
給予/etc/init.d/mysqld運行權限
chmod 755 /etc/init.d/mysqld
啟動mysql服務
/etc/init.d/mysqld start
停止mysql服務
/etc/init.d/mysqld stop
10、修改mysql登錄密碼
因為mysql安全等級的提高，初始化的密碼必須更換后才可以進行各種數據庫操作，所以進去后第一步要先修改密碼
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密碼'
FLUSH PRIVILEGES
至此mysql8就算安裝完成了
Ps.在啟動過程中出現了 Starting MySQL...The server quit without updating PID file (/usr/local/mysql8/data/localhost.pid).[失敗] 的錯誤
檢查一遍沒發現問題，就用 /usr/local/mysql8/bin/mysqld_safe --defaults-file=/etc/my.cnf & 啟動試試，成功，然后退出，再次用 /etc/init.d/mysqld start 啟動就可以成功啟動了，為什么會這樣我也沒搞明白，抽空再研究