多实例的应用

准备多个目录

mkdir -p /data/330{7,8,9}/data

准备配置文件

cat > /data/3307/my.cnf <<EOF
[mysqld]
basedir=/application/mysql
datadir=/data/3307/data
socket=/data/3307/mysql.sock
log_error=/data/3307/mysqld.log
port=3307
server_id=7
log_bin=/data/3307/mysql-bin
EOF

cat > /data/3308/my.cnf <<EOF
[mysqld]
basedir=/application/mysql
datadir=/data/3308/data
socket=/data/3308/mysql.sock
log_error=/data/3308/mysqld.log
port=3308
server_id=8
log_bin=/data/3308/mysql-bin
EOF

cat > /data/3309/my.cnf <<EOF
[mysqld]
basedir=/application/mysql
datadir=/data/3309/data
socket=/data/3309/mysql.sock
log_error=/data/3309/mysqld.log
port=3309
server_id=9
log_bin=/data/3309/mysql-bin
EOF

初始化三套数据

mv /etc/my.cnf /etc/my.cnf.bak
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

cd /etc/systemd/system
cp mysqld.service mysqld3307.service
cp mysqld.service mysqld3308.service
cp mysqld.service mysqld3309.service

sed -i 's#/etc/my.cnf#/data/3307/my.cnf#' mysqld3307.service
# vim mysqld3307.service
# ExecStart=/application/mysql/bin/mysqld  --defaults-file=/data/3307/my.cnf

sed -i 's#/etc/my.cnf#/data/3308/my.cnf#' mysqld3308.service
# vim mysqld3308.service
# ExecStart=/application/mysql/bin/mysqld  --defaults-file=/data/3308/my.cnf

sed -i 's#/etc/my.cnf#/data/3309/my.cnf#' mysqld3309.service
# vim mysqld3309.service
# ExecStart=/application/mysql/bin/mysqld  --defaults-file=/data/3309/my.cnf

授权

chown -R mysql.mysql /data/*

启动

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

验证多实例

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"