MySQL 起停脚本
#!/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 $?
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