Windows：
1.下載：https://dev.mysql.com/downloads/mysql/
推薦使用鏡像：http://mirrors.sohu.com/mysql/MySQL-8.0/
2.下載完成之后， 解壓到目錄下，例如：D:\mysql-8.0.22-winx64
3. 設置環境變量
變量名稱：MYSQL_HOME
變量值：D:\mysql-8.0.22-winx64
4. 生成data目錄
注意： 以管理員身份運行cmd
進入到bin目錄下D:\mysql-8.0.22-winx64\bin
執行命令：
mysqld --initialize-insecure --user=mysql
則會在bin目錄的同級生成data目錄
5. 安裝MySQL
mysqld -install
6. 啟動服務
net start MySQL
7. 登錄MySQL
mysql -u root -p //默認沒有設置密碼， 直接回車即可
8）查詢用戶密碼
select host,user,authentication_string from mysql.user
9）密碼修改
use mysql; ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
flush privileges;
10）再次登錄
11）mysql配置
默認mysql8.0是data目錄中是不存在my.ini配置文件的，如有需要新建即可
# For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the # *** default location during install, and will be replaced if you # *** upgrade to a newer version of MySQL. [client] default-character-set = utf8mb4 [mysql] default-character-set = utf8mb4 [mysqld] character-set-client-handshake = FALSE character-set-server = utf8mb4 collation-server = utf8mb4_bin init_connect='SET NAMES utf8mb4' # 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 leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin # These are commonly set, remove the # and set as required. basedir = D:\mysql-8.0.22-winx64 datadir = D:\mysql-8.0.22-winx64\data port = 3306 # server_id = ..... # 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 = 16M read_rnd_buffer_size = 16M sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
設置完成之后， 可以設置mysql默認的配置文件
mysqld --defaults-file="D:\mysql-8.0.22-winx64\data\my.ini"
然后重啟服務即可， 如果你在開始安裝的時候已經創建了配置文件，可以在安裝的時候直接指定即可
mysqld --install "MySql80" --defaults-file="C:\install\mysql\mysql-8.0.16-winx64\my.ini"
其他相關命令：
1. 停止MySQL服務
net stop mysql
Linux
1.下載rpm包
Wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
2.使用yum進行安裝
yum install mysql80-community-release-el7-3.noarch.rpm
3.查看yum中的mysql版本
yum repolist all | grep mysql
4.使用yum-config-manager進行安裝
yum-config-manager 命令不存在的時候，安裝yum-config-manager
yum -y install yum-utils
5.選擇安裝的mysql版本
sudo yum-config-manager --disable mysql57-community
sudo yum-config-manager --enable mysql80-community
6.查看已選擇的版本
yum repolist enabled | grep mysql
如果系統是centos8的話，需要單獨操作
sudo yum module disable mysql
7.使用yum進行安裝
yum install mysql
由於網絡等問題， 使用yum下載MySQL相關包失敗， 無奈只能使用rpm進行安裝
rpm:
1)檢查mysql是否安裝
rpm -qa|grep mysql Rpm -qa|grep mariadb 如果存在mariadb則卸載 Yum remove mariadb-libs-...
2）設置阿里雲yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
3）生成緩存
Yum makecache
4）下載rpm包（http://mirrors.ustc.edu.cn/mysql-ftp/Downloads）
1）下載server http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-8.0/mysql-community-server-8.0.22-1.el7.x86_64.rpm 2）Client http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-8.0/mysql-community-client-8.0.22-1.el7.x86_64.rpm 3）Common http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-8.0/mysql-community-common-8.0.22-1.el7.x86_64.rpm 4）Lib http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-8.0/mysql-community-libs-8.0.22-1.el7.x86_64.rpm
5）首先安裝環境依賴
yum install -y perl.x86_64 yum install -y libaio.x86_64 yum install -y net-tools.x86_64
6）安裝
rpm -ivh mysql-community-common-5.7.25-1.el7.x86_64.rpm rpm -ivh mysql-community-libs-5.7.25-1.el7.x86_64.rpm rpm -ivh mysql-community-client-5.7.25-1.el7.x86_64.rpm rpm -ivh mysql-community-server-5.7.25-1.el7.x86_64.rpm
7）啟動mysql服務
Systemctl start mysqld
8）安裝之后，查看默認的登錄密碼
Grep ‘temporary password’ /var/log/mysqld.log
9）登錄設置修改初始密碼，並允許遠程連接
Mysql -u root -p 123456 Alter user ‘root’@’localhost’ identified with mysql_native_password by ‘password’; 允許遠程訪問： update user set Host='%' where Host='localhost' and 'User'='root'; 立即生效： Flush privileges;
10）開放相應端口
-- 查看已經開放的端口 firewall-cmd --list-ports -- 開啟端口 firewall-cmd --zone=public --add-port=3306/tcp --permanent
注意點：
- 修改密碼8.0版本中已經沒有password函數
需要使用mysql_native_password 來進行修改
2. mysql8.0版本必須符合長度（默認是8位），且必須含有數字，小寫或大寫字母，特殊字符。因為實在我本地自己的庫，所以我修改了密碼最小長度和密碼的策略
3. 遠程連接數據庫 出現 Client does not support authentication protocol requested by server（使用mysql_native_password 操作）
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
4.使用docker運行mysql8之后就行鏈接報錯：
Can't connect to local MySQL server through socket '/tmp/mysql.sock
最后發現是我連接的時候沒有指定 -h 需要指定一下-h 127.0.0.1 即可