标签：des io os ar for sp art c on
#!/bin/sh
#
# mysqld This shell script takes care of starting and stopping
# the MySQL subsystem (mysqld).
#
# chkconfig: - 64 36
# description: MySQL database server.
# processname: mysqld
# config: /etc/my.cnf
# pidfile: /var/run/mysqld/mysqld.pid
### BEGIN INIT INFO
# Provides: mysqld
# Required-Start: $local_fs $remote_fs $network $named $syslog $time
# Required-Stop: $local_fs $remote_fs $network $named $syslog $time
# Short-Description: start and stop MySQL server
# Description: MySQL database server
### END INIT INFO
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
exec="/usr/bin/mysqld_safe"
prog="mysqld"
# Set timeouts here so they can be overridden from /etc/sysconfig/mysqld
STARTTIMEOUT=120
STOPTIMEOUT=60
[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog
lockfile=/var/lock/subsys/$prog
# 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/bin/my_print_defaults "$1" | sed -n "s/^--$2=//p" | tail -n 1`
if [ -z "$result" ]; then
# not found, use default
result="$3"
fi
}
get_mysql_option mysqld datadir "/var/lib/mysql"
datadir="$result"
get_mysql_option mysqld socket "$datadir/mysql.sock"
socketfile="$result"
get_mysql_option mysqld_safe log-error "/var/log/mysqld.log"
errlogfile="$result"
get_mysql_option mysqld_safe pid-file "/var/run/mysqld/mysqld.pid"
mypidfile="$result"
start(){
[ -x $exec ] || exit 5
# check to see if it‘s already running
MYSQLDRUNNING=0
if [ -f "$mypidfile" ]; then
MYSQLPID=`cat "$mypidfile" 2>/dev/null`
if [ -n "$MYSQLPID" ] && [ -d "/proc/$MYSQLPID" ] ; then
MYSQLDRUNNING=1
fi
fi
RESPONSE=`/usr/bin/mysqladmin --socket="$socketfile" --user=UNKNOWN_MYSQL_USER ping 2>&1`
if [ $MYSQLDRUNNING = 1 ] && [ $? = 0 ]; then
# already running, do nothing
action $"Starting $prog: " /bin/true
ret=0
elif [ $MYSQLDRUNNING = 1 ] && echo "$RESPONSE" | grep -q "Access denied for user"
then
# already running, do nothing
action $"Starting $prog: " /bin/true
ret=0
else
# prepare for start
touch "$errlogfile" 2>/dev/null
if [ $? -ne 0 ]; then
# failed to touch log file, probably insufficient permissions
action $"Starting $prog: " /bin/false
return 4
fi
chown mysql:mysql "$errlogfile"
chmod 0640 "$errlogfile"
[ -x /sbin/restorecon ] && /sbin/restorecon "$errlogfile"
if [ ! -d "$datadir/mysql" ] ; then
# First, make sure $datadir is there with correct permissions
if [ ! -e "$datadir" -a ! -h "$datadir" ]
then
mkdir -p "$datadir" || exit 1
fi
chown mysql:mysql "$datadir"
chmod 0755 "$datadir"
[ -x /sbin/restorecon ] && /sbin/restorecon "$datadir"
# Now create the database
action $"Initializing MySQL database: " /usr/bin/mysql_install_db --datadir="$datadir" --user=mysql
ret=$?
chown -R mysql:mysql "$datadir"
if [ $ret -ne 0 ] ; then
return $ret
fi
fi
chown mysql:mysql "$datadir"
chmod 0755 "$datadir"
# We check if there is already a process using the socket file,
# since otherwise this init script could report false positive
# result and mysqld_safe would remove the socket file, which
# actually uses a different daemon.
if fuser "$socketfile" &>/dev/null ; then
echo "Socket file $socketfile exists. Is another MySQL daemon already running with the same unix socket?"
action $"Starting $prog: " /bin/false
return 1
fi
# 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. (An exception is that we don‘t force the
# log-error setting, since this script doesn‘t really depend on that,
# and some users might prefer to configure logging to syslog.)
# Note: set --basedir to prevent probes that might trigger SELinux
# alarms, per bug #547485
$exec --datadir="$datadir" --socket="$socketfile" \
--pid-file="$mypidfile" \
--basedir=/usr --user=mysql >/dev/null 2>&1 &
safe_pid=$!
# Spin for a maximum of N seconds waiting for the server to come up;
# exit the loop immediately if mysqld_safe process disappears.
# Rather than assuming we know a valid username, accept an "access
# denied" response as meaning the server is functioning.
ret=0
TIMEOUT="$STARTTIMEOUT"
while [ $TIMEOUT -gt 0 ]; do
RESPONSE=`/usr/bin/mysqladmin --socket="$socketfile" --user=UNKNOWN_MYSQL_USER ping 2>&1`
mret=$?
if [ $mret -eq 0 ]; then
break
fi
# exit codes 1, 11 (EXIT_CANNOT_CONNECT_TO_SERVICE) are expected,
# anything else suggests a configuration error
if [ $mret -ne 1 -a $mret -ne 11 ]; then
echo "$RESPONSE"
echo "Cannot check for MySQL Daemon startup because of mysqladmin failure."
ret=1
break
fi
echo "$RESPONSE" | grep -q "Access denied for user" && break
if ! /bin/kill -0 $safe_pid 2>/dev/null; then
echo "MySQL Daemon failed to start."
ret=1
break
fi
sleep 1
let TIMEOUT=${TIMEOUT}-1
done
if [ $TIMEOUT -eq 0 ]; then
echo "Timeout error occurred trying to start MySQL Daemon."
ret=1
fi
if [ $ret -eq 0 ]; then
action $"Starting $prog: " /bin/true
chmod o+r $mypidfile >/dev/null 2>&1
touch $lockfile
else
action $"Starting $prog: " /bin/false
fi
fi
return $ret
}
stop(){
if [ ! -f "$mypidfile" ]; then
# not running; per LSB standards this is "ok"
action $"Stopping $prog: " /bin/true
return 0
fi
MYSQLPID=`cat "$mypidfile" 2>/dev/null`
if [ -n "$MYSQLPID" ]; then
/bin/kill "$MYSQLPID" >/dev/null 2>&1
ret=$?
if [ $ret -eq 0 ]; then
TIMEOUT="$STOPTIMEOUT"
while [ $TIMEOUT -gt 0 ]; do
/bin/kill -0 "$MYSQLPID" >/dev/null 2>&1 || break
sleep 1
let TIMEOUT=${TIMEOUT}-1
done
if [ $TIMEOUT -eq 0 ]; then
echo "Timeout error occurred trying to stop MySQL Daemon."
ret=1
action $"Stopping $prog: " /bin/false
else
rm -f $lockfile
rm -f "$socketfile"
action $"Stopping $prog: " /bin/true
fi
else
action $"Stopping $prog: " /bin/false
fi
else
# failed to read pidfile, probably insufficient permissions
action $"Stopping $prog: " /bin/false
ret=4
fi
return $ret
}
restart(){
stop
start
}
condrestart(){
[ -e $lockfile ] && restart || :
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status -p "$mypidfile" $prog
;;
restart)
restart
;;
condrestart|try-restart)
condrestart
;;
reload)
exit 3
;;
force-reload)
restart
;;
*)
echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
exit 2
esac
exit $?
标签：des io os ar for sp art c on
原文地址：http://www.cnblogs.com/chromebook/p/4004912.html
