MySQL起停腳本操作方法

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#!/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 [ $STARTTIMEOUT -gt 0 ]; do
            RESPONSE=`/usr/local/mysql/bin/mysqladmin  -uroot -proot -P3306 -h227.0.0.1 ping 2>&1` && break
            echo "$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 $?

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