MySQL起停脚本

桃扇骨 2022-06-18 12:26 122阅读 0赞

#!/bin/bash
    #
    # mysqld        This shell script takes care of starting and stopping
    #               the MySQL subsystem (mysqld).
    #
    # chkconfig: 2345 78 36
    # description:  MySQL database server.
    # processname: mysqld
    # config: /data/mysql/mysql3306/data/my3306.cnf
    # pidfile: /data/mysql/mysql3306/data/mysql3306.pid
    # Source function library.
    . /etc/rc.d/init.d/functions
    # Source networking configuration.
    . /etc/sysconfig/network
    prog="MySQL"
    # extract value of a MySQL option from config files
    # Usage: get_mysql_option SECTION VARNAME DEFAULT
    # result is returned in $result
    # We use my_print_defaults which prints all options from multiple files,
    # with the more specific ones later; hence take the last match.
    get_mysql_option(){
            result=`/usr/local/mysql/bin/my_print_defaults --defaults-file=/data/mysql/mysql3306/my.cnf  "$1" | sed -n "s/^--$2=//p" | tail -n 1`
            if [ -z "$result" ]; then
                # not found, use default
                result="$3"
            fi
    }
    servername=`hostname`
    get_mysql_option mysqld datadir "/data/mysql/mysql3306/data/"
    datadir="$result"
    get_mysql_option mysqld socket "/data/mysql/mysql3306/data/mysql.sock"
    socketfile="$result"
    get_mysql_option mysqld log-error "/data/mysql/mysql3306/data/error.log"
    errlogfile="$result"
    get_mysql_option mysqld pid-file "/data/mysql/mysql3306/data/mysql.pid"
    mypidfile="$result"
    start(){
            touch "$errlogfile"
            chown mysql:mysql "$errlogfile" 
            chmod 0640 "$errlogfile"
            [ -x /sbin/restorecon ] && /sbin/restorecon "$errlogfile"
            # Pass all the options determined above, to ensure consistent behavior.
            # In many cases mysqld_safe would arrive at the same conclusions anyway
            # but we need to be sure.
            /usr/local/mysql/bin/mysqld_safe   --defaults-file=/data/mysql/mysql3306/my.cnf \
                    --user=mysql  \
                    >/dev/null 2>&1 &
            ret=$?
            # Spin for a maximum of N seconds waiting for the server to come up.
            # Rather than assuming we know a valid username, accept an "access
            # denied" response as meaning the server is functioning.
            if [ $ret -eq 0 ]; then
                STARTTIMEOUT=30
                while [ $STARTTIMEOUT -gt 0 ]; do
                    RESPONSE=`/usr/local/mysql/bin/mysqladmin  -uroot -proot -P3306 -h127.0.0.1 ping 2>&1` && break
                    echo "$RESPONSE" | grep -q "Access denied for user" && break
                    sleep 1
                    let STARTTIMEOUT=${STARTTIMEOUT}-1
                done
                if [ $STARTTIMEOUT -eq 0 ]; then
                        echo "Timeout error occurred trying to start MySQL Daemon."
                        action $"Starting $prog: " /bin/false
                        ret=1
                else
                        action $"Starting $prog: " /bin/true
                fi
            else
                action $"Starting $prog: " /bin/false
            fi
            [ $ret -eq 0 ] && touch /var/lock/subsys/mysqld
            return $ret
    }
    stop(){
            MYSQLPID=`cat "$mypidfile"  2>/dev/null `
            if [ -n "$MYSQLPID" ]; then
              /bin/kill "$MYSQLPID" >/dev/null 2>&1
                ret=$?
                if [ $ret -eq 0 ]; then
                    STOPTIMEOUT=60
                    while [ $STOPTIMEOUT -gt 0 ]; do
                        /bin/kill -0 "$MYSQLPID" >/dev/null 2>&1 || break
                        sleep 1
                        let STOPTIMEOUT=${STOPTIMEOUT}-1
                    done
                    if [ $STOPTIMEOUT -eq 0 ]; then
                        echo "Timeout error occurred trying to stop MySQL Daemon."
                        ret=1
                        action $"Stopping $prog: " /bin/false
                    else
                        rm -f /var/lock/subsys/mysqld
                        rm -f "$socketfile"
                        action $"Stopping $prog: " /bin/true
                    fi
                else
                    action $"Stopping $prog: " /bin/false
                fi
            else
                ret=1
                action $"Stopping $prog: " /bin/false
            fi
            return $ret
    }
     
    restart(){
        stop
        start
    }
    condrestart(){
        [ -e /var/lock/subsys/mysqld ] && restart || :
    }
    # See how we were called.
    case "$1" in
      start)
        start
        ;;
      stop)
        stop
        ;;
      status)
        status mysqld
        ;;
      restart)
        restart
        ;;
      condrestart)
        condrestart
        ;;
      *)
        echo $"Usage: $0 {start|stop|status|condrestart|restart}"
        exit 1
    esac
    exit $?