mysqld服务开机自启动(CentOS 6.5)

Posted 2020-12-28 leon2659

#!/bin/sh
#
# mysqld This shell script takes care of starting and stopping
# the MySQL subsystem (mysqld).
#
# chkconfig: 345 64 36
# description: MySQL database server.
# processname: mysqld
# config: /etc/my.cnf
# pidfile: /var/run/mysqld/mysqld.pid

# 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

# Set in /etc/sysconfig/mysqld, will be passed to mysqld_safe
MYSQLD_OPTS=

[ -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 OPTION DEFAULT SECTION1 SECTION2 SECTIONN
# 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 () {
option=$1
default=$2
shift 2
result=$(/usr/bin/my_print_defaults "[email protected]" | sed -n "s/^--${option}=//p" | tail -n 1)
if [ -z "$result" ]; then
# not found, use default
result="${default}"
fi
}

get_mysql_option datadir "/var/lib/mysql" mysqld
datadir="$result"
get_mysql_option socket "$datadir/mysql.sock" mysqld
socketfile="$result"
get_mysql_option log-error "/var/log/mysqld.log" mysqld mysqld_safe
errlogfile="$result"
get_mysql_option pid-file "/var/run/mysqld/mysqld.pid" mysqld mysqld_safe
mypidfile="$result"

case $socketfile in
/*) adminsocket="$socketfile" ;;
*) adminsocket="$datadir/$socketfile" ;;
esac

start(){
[ -x $exec ] || exit 5
# check to see if it‘s already running
RESPONSE=$(/usr/bin/mysqladmin --no-defaults --socket="$adminsocket" --user=UNKNOWN_MYSQL_USER ping 2>&1)
if [ $? = 0 ]; then
# already running, do nothing
action $"Starting $prog: " /bin/true
ret=0
elif echo "$RESPONSE" | grep -q "Access denied for user"
then
# already running, do nothing
action $"Starting $prog: " /bin/true
ret=0
else
# prepare for start
if [ ! -e "$errlogfile" -a ! -h "$errlogfile" -a "x$(dirname "$errlogfile")" = "x/var/log" ]; then
install /dev/null -m0640 -omysql -gmysql "$errlogfile"
fi
[ -x /sbin/restorecon ] && /sbin/restorecon "$errlogfile"
if [ ! -d "$datadir/mysql" ] ; then
# First, make sure $datadir is there with correct permissions
if [ ! -d "$datadir" -a ! -h "$datadir" -a "x$(dirname "$datadir")" = "x/var/lib" ]; then
install -d -m0755 -omysql -gmysql "$datadir" || exit 1
fi
if [ ! -h "$datadir" -a "x$(dirname "$datadir")" = "x/var/lib" ]; then
chown mysql:mysql "$datadir"
chmod 0755 "$datadir"
fi
if [ -x /sbin/restorecon ]; then
/sbin/restorecon "$datadir"
for dir in /var/lib/mysql-files ; do
if [ -x /usr/sbin/semanage -a -d /var/lib/mysql -a -d $dir ] ; then
/usr/sbin/semanage fcontext -a -e /var/lib/mysql $dir >/dev/null 2>&1
/sbin/restorecon $dir
fi
done
fi
# Now create the database
action $"Initializing MySQL database: " /usr/bin/mysql_install_db --rpm --datadir="$datadir" --user=mysql
ret=$?
if [ $ret -ne 0 ] ; then
return $ret
fi
fi
if [ ! -h "$datadir" -a "x$(dirname "$datadir")" = "x/var/lib" ]; then
chown mysql:mysql "$datadir"
chmod 0755 "$datadir"
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 $MYSQLD_OPTS --datadir="$datadir" --socket="$socketfile"
--pid-file="$mypidfile"
--basedir=/usr --user=mysql >/dev/null &
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 --no-defaults --socket="$adminsocket" --user=UNKNOWN_MYSQL_USER ping 2>&1) && break
echo "$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
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"`
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 $?