详解MySQL单实例和多实例启动脚本

mysqld_safe --defaults-file=/data/3306/my.cnf &

mysqladmin -uroot -pchang123 -S /data/3306/mysql.sock shutdown

# Mysql启动
mysqld_safe &
# Mysql停止
mysqld_admin -u root -p Chang123 shutdown

# 设置root密码
[root@vm1 scripts]# mysqladmin -uroot password "Chang123"
# 先将mariadb停止
[root@vm1 scripts]# mysqladmin -uroot -pChang123 shutdown
# 检查进程是否停止
[root@vm1 scripts]# netstat -atunlp |grep 3306
# 再启动mysql
[root@vm1 scripts]# mysqld_safe --user=mysql &
[1] 11535
[root@vm1 scripts]# 230802 21:49:37 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
230802 21:49:37 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
# 再检查mysql进程是否已启动
[root@vm1 scripts]# netstat -atunlp |grep 3306
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      11681/mysqld   

[root@vm1 scripts]# cat start_db.sh
#!/bin/bash
#
[ -f /etc/init.d/functions ] && . /etc/init.d/functions || echo 1
usage(){
  echo “USAGE: $0 {start|stop|restart}
  exit 1
}
if [ $# -ne 1 ]
  then
    usage
fi
start() {
  mysqld_safe --user=mysql >/dev/null 2>&1 &
  if [ $? -eq 0 ]
    then
      action "start mysql" /bin/true
  else
      action "start mysql" /bin/false
  fi
}
stop() {
  mysqladmin -uroot -pChang123 shutdown >/dev/null 2>&1
  if [ $? -eq 0 ]
    then
      action  "stop mysql" /bin/true
  else
      action "stop mysql" /bin/false
  fi
}
restart() {
  stop
  sleep 2
  start
}
if [ "$1" == "start" ]
  then
    start
elif [ "$1" == "stop" ]
  then
    stop
elif [ "$1" == "restart" ]
  then
    restart
else
    usage
fi
 

[root@vm1 scripts]# sh start_db.sh start
start mysql                                                [  OK  ]
[root@vm1 scripts]# sh start_db.sh stop
stop mysql                                                 [  OK  ]
[root@vm1 scripts]# sh start_db.sh restart
stop mysql                                                 [  OK  ]
start mysql                                                [  OK  ]
[root@vm1 scripts]# netstat -atunlp |grep 3306
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      13173/mysqld   

[root@vm1 scripts]# cat mysql_manage.sh
#!/bin/bash
#
Port=3306
MysqlUser="root"
MysqlPassword="Chang123"
CmdPath="/usr/local/mysql/bin"
#start function
start() {
  if [ `netstat -auntlp |grep "$Port" | wc -l` -eq 0 ]
    then
      echo "Starting MySQL..."
      /bin/sh ${CmdPath}/mysqld_safe --defaults-fle=/data/${Port}/my.cnf 2>&1 >/dev/null &
  else
      echo "MySQL is running..."
}
#stop function
stop(){
  if [ `netstat -atunlp |grep "$Port" | wc -l` -eq 0 ]
    then
      echo "Stopping MySQL..."
      ${CMDPath}/mysqladmin -u ${MysqlUser} -p {$MysqlPassword} -S /data/${Port}/mysql.sock shutdown
  else
      echo "MySQL is stopped..."
  fi
}
#restart function
restart(){
  echo "Restarting MySQL..."
  stop
  sleep 2
  start
}
case "$1" in
start)
    start
    ;;
stop)
    stop
    ;;
restart)
    restart
    ;;
*)
   echo "USAGE: $0 {start|stop|restart}"
esac

# chkconfig: 2345 20 80
# description: Start mysql and stop mysql script.