一、MySQL实例在分布式架构中应用广泛

#若之前已经执行过，需要重新执行时需要重新启动多实例
\rm -rf /da/mysql/data_{3307,3308,3309}
mkdir -p /data/mysql/data_{3307,3308,3309}

二、 配置文件准备

cat > /data/mysql/my3307.cnf <<EOF
[mysqld]
user=mysql
port=3307
basedir=/usr/local/mysql57
datadir=/data/mysql/data_3307
server_id=7
socket=/tmp/mysql3307.sock
EOF

cat > /data/mysql/my3308.cnf <<EOF
[mysqld]
user=mysql
port=3308
basedir=/usr/local/mysql57
datadir=/data/mysql/data_3308
server_id=8
socket=/tmp/mysql3308.sock
EOF

cat > /data/mysql/my3309.cnf <<EOF
[mysqld]
user=mysql
port=3309
basedir=/usr/local/mysql57
datadir=/data/mysql/data_3309
server_id=9
socket=/tmp/mysql3309.sock
EOF

三、授权

chown -R mysql.mysql /data/

四、初始化数据

mysqld --initialize-insecure --user=mysql --basedir=/usr/local/mysql57 --datadir=/data/mysql/data_3307
mysqld --initialize-insecure --user=mysql --basedir=/usr/local/mysql57 --datadir=/data/mysql/data_3308
mysqld --initialize-insecure --user=mysql --basedir=/usr/local/mysql57 --datadir=/data/mysql/data_3309

五、启动多实例

mysqld --defaults-file=/data/mysql/my3307.cnf &
mysqld --defaults-file=/data/mysql/my3308.cnf &
mysqld --defaults-file=/data/mysql/my3309.cnf &
netstat -tulnp

六、使用systemed管理多实例

cat >/etc/systemd/system/mysqld3307.service <<EOF
[Unit]
Description=MySQL Server
Documentation=man:mysqld(8)
Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html
After=network.target
After=syslog.target
[Install]
WantedBy=multi-user.target
[Service]
User=mysql
Group=mysql
ExecStart=/usr/local/mysql57/bin/mysqld --defaults-file=/data/mysql/my3307.cnf
LimitNOFILE = 5000
EOF

cat >/etc/systemd/system/mysqld3308.service <<EOF
[Unit]
Description=MySQL Server
Documentation=man:mysqld(8)
Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html
After=network.target
After=syslog.target
[Install]
WantedBy=multi-user.target
[Service]
User=mysql
Group=mysql
ExecStart=/usr/local/mysql57/bin/mysqld --defaults-file=/data/mysql/my3308.cnf
LimitNOFILE = 5000
EOF

cat >/etc/systemd/system/mysqld3309.service <<EOF
[Unit]
Description=MySQL Server
Documentation=man:mysqld(8)
Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html
After=network.target
After=syslog.target
[Install]
WantedBy=multi-user.target
[Service]
User=mysql
Group=mysql
ExecStart=/usr/local/mysql57/bin/mysqld --defaults-file=/data/mysql/my3309.cnf
LimitNOFILE = 5000
EOF

#启动
pkill mysqld
systemctl restart mysqld
systemctl start mysqld3306
systemctl start mysqld3307
systemctl start mysqld3308