結構如圖所示
1.同版本多實例 ：
3306節點部署請參考mysql 8,0安裝部署
#1.創建相關目錄
mkdir -p /data/3307/data /data/3308/data
#2.授權
chown -R mysql.mysql /data/
#3.編寫配置文檔
cp /etc/my.cnf /etc/my3307.cnf
cp /etc/my.cnf /etc/my3308.cnf
3307配置檔：
[root@db01 /data20:22:30]# cat /etc/my3307.cnf
[mysqld]
user=mysql
basedir=/usr/local/mysql
datadir=/data/3307/data
socket=/tmp/mysql3307.sock
server_id=52
port=3307
3308配置檔：
[root@db01 /data20:23:16]# cat /etc/my3308.cnf
[mysqld]
user=mysql
basedir=/usr/local/mysql
datadir=/data/3308/data
socket=/tmp/mysql3308.sock
server_id=53
port=3308
#4.初始化
mysqld --defaults-file=/etc/my3307.cnf --initialize-insecure
mysqld --defaults-file=/etc/my3308.cnf --initialize-insecure
#5.啟動mysql(因為是同版本，mysqld已經在3306啟動，所以用mysqd_safe,可參考mysql的啟動)
mysqld_safe --defaults-file=/etc/my3307.cnf &
mysqld_safe --defaults-file=/etc/my3308.cnf &
#6.登錄測試
mysql -S /tmp/mysql3307.sock
mysql -S /tmp/mysql3308.sock
2.不同版本多實例：
#1.准備相關軟件
上傳軟件版本/opt目錄
mysql-5.6.50-linux-glibc2.12-x86_64.tar.gz
mysql-5.7.32-linux-glibc2.12-x86_64.tar.gz
#2.解壓
tar xf mysql-5.6.50-linux-glibc2.12-x86_64.tar.gz
tar xf mysql-5.7.32-linux-glibc2.12-x86_64.tar.gz
#3.做軟鏈接
[root@db01 /usr/local20:42:21]# ln -s /opt/mysql-5.7.32-linux-glibc2.12-x86_64 /usr/local/mysql57
[root@db01 /usr/local20:42:38]# ln -s /opt/mysql-5.6.50-linux-glibc2.12-x86_64 /usr/local/mysql56
#4.創建數據目錄及授權
mkdir -p /data/{3356,3357}/data
chown -R mysql.mysql /data
#5.創建配置檔
cat > /etc/my3356.cnf <<EOF
[mysqld]
user=mysql
basedir=/usr/local/mysql56
datadir=/data/3356/data
socket=/tmp/mysql3356.sock
server_id=56
port=3356
EOF
cat > /etc/my3357.cnf <<EOF
[mysqld]
user=mysql
basedir=/usr/local/mysql57
datadir=/data/3357/data
socket=/tmp/mysql3357.sock
server_id=57
port=3357
EOF
#6.初始化
5.6版本：
/usr/local/mysql56/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql56 --datadir=/data/3356/data
5.7版本：
/usr/local/mysql57/bin/mysqld --defaults-file=/etc/my3357.cnf --initialize-insecure
#7.啟動mysql
/usr/local/mysql57/bin/mysqld_safe --defaults-file=/etc/my3357.cnf &
/usr/local/mysql56/bin/mysqld_safe --defaults-file=/etc/my3356.cnf &
#8.登錄測試Mysql
mysql -S /tmp/mysql3356.sock
mysql -S /tmp/mysql3357.sock
3.遇到報錯處理：
#mysql 5.7.32版本：
[ERROR] Can't start server : Bind on unix socket: Address already in use
[ERROR] Do you already have another mysqld server running on socket: /tmp/mysql3357.sock ?
[ERROR] Aborting
[root@db01 /tmp23:05:25]# ll
-rw-r--r-- 1 root root 0 Nov 20 21:58 mysql3356.sock
-rw------- 1 mysql mysql 5 Nov 20 22:02 mysql3356.sock.lock
-rw-r--r-- 1 root root 0 Nov 20 21:58 mysql3357.sock
-rw------- 1 mysql mysql 5 Nov 20 22:15 mysql3357.sock.lock
處理方法：
將占用sock文件刪掉，重啟
/usr/local/mysql57/bin/mysqld_safe --defaults-file=/etc/my3357.cnf &
#mysql 5.6.50版本：
2021-11-20 23:08:02 8811 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.user' doesn't exist
先將data目錄下的數據全部刪掉，重新初始化和啟動后測試OK