创建目录

mkdir -p /data/330{7,8,9}/data
生成各自实例数据存储目录

准备配置文件

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#3307实例
cat > /data/3307/my.cnf <<EOF
[mysqld]
basedir=/application/mysql  #软件目录
datadir=/data/3307/data  #本实例数据目录
socket=/data/3307/mysql.sock #本实例socket文件
log_error=/data/3307/mysql.log
port=3307
server_id=7
log_bin=/data/3307/mysql-bin
EOF
#3308实例
cat > /data/3308/my.cnf <<EOF
[mysqld]
basedir=/application/mysql
datadir=/data/3308/data
socket=/data/3308/mysql.sock
log_error=/data/3308/mysql.log
port=3308
server_id=8
log_bin=/data/3308/mysql-bin
EOF
#3309实例
cat > /data/3309/my.cnf <<EOF
[mysqld]
basedir=/application/mysql
datadir=/data/3309/data
socket=/data/3309/mysql.sock
log_error=/data/3309/mysql.log
port=3309
server_id=9
log_bin=/data/3309/mysql-bin
EOF

各自实例初始化三套数据

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mv /etc/my.cnf /etc/my.cnf.bak #防止原始配置文件影响后面数据库的初始化
mysqld --initialize-insecure  --user=mysql --datadir=/data/3307/data --basedir=/application/mysql
mysqld --initialize-insecure  --user=mysql --datadir=/data/3308/data --basedir=/application/mysql
mysqld --initialize-insecure  --user=mysql --datadir=/data/3309/data --basedir=/application/mysql

systemd管理多实例

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cd /etc/systemd/system
cp mysqld.service mysqld3307.service
cp mysqld.service mysqld3308.service
cp mysqld.service mysqld3309.service
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vim mysqld3307.service
ExecStart=/application/mysql/bin/mysqld  --defaults-file=/data/3307/my.cnf
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vim mysqld3308.service
ExecStart=/application/mysql/bin/mysqld  --defaults-file=/data/3308/my.cnf
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vim mysqld3309.service
ExecStart=/application/mysql/bin/mysqld  --defaults-file=/data/3309/my.cnf

授权

chown -R mysql.mysql /data/*

启动

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systemctl start mysqld3307.service
systemctl start mysqld3308.service
systemctl start mysqld3309.service

验证多实例

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netstat -lnp|grep 330
mysql -S /data/3307/mysql.sock -e "select @@server_id"
mysql -S /data/3308/mysql.sock -e "select @@server_id"
mysql -S /data/3309/mysql.sock -e "select @@server_id"