#!/bin/sh # Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB # This file is public domain and comes with NO WARRANTY of any kind
# MySQL daemon start/stop script.
# Usually this is put in /etc/init.d (at least on machines SYSV R4 based # systems) and linked to /etc/rc3.d/S99mysql and /etc/rc0.d/K01mysql. # When this is done the mysql server will be started when the machine is # started and shut down when the systems goes down.
# Comments to support chkconfig on RedHat Linux # chkconfig: 2345 64 36 # description: A very fast and reliable SQL database engine.
# Comments to support LSB init script conventions ### BEGIN INIT INFO # Provides: mysql # Required-Start: $local_fs $network $remote_fs # Should-Start: ypbind nscd ldap ntpd xntpd # Required-Stop: $local_fs $network $remote_fs # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: start and stop MySQL # Description: MySQL is a very fast and reliable SQL database engine. ### END INIT INFO # If you install MySQL on some other places than /usr/local/mysql, then you # have to do one of the following things for this script to work: # # - Run this script from within the MySQL installation directory # - Create a /etc/my.cnf file with the following information: # [mysqld] # basedir=<path-to-mysql-installation-directory> # - Add the above to any other configuration file (for example ~/.my.ini) # and copy my_print_defaults to /usr/bin # - Add the path to the mysql-installation-directory to the basedir variable # below. # # If you want to affect other MySQL variables, you should make your changes # in the /etc/my.cnf, ~/.my.cnf or other MySQL configuration files.
# If you change base dir, you must also change datadir. These may get # overwritten by settings in the MySQL configuration files.
# Default value, in seconds, afterwhich the script should timeout waiting # for server start. # Value here is overriden by value in my.cnf. # 0 means don't wait at all # Negative numbers mean to wait indefinitely service_startup_timeout=900
# Lock directory for RedHat / SuSE. lockdir='/var/lock/subsys' lock_file_path="$lockdir/mysql"
# The following variables are only set for letting mysql.server find things.
# Set some defaults mysqld_pid_file_path= #如果$basedir 字符串为空 #则定位到默认位置 #basedir=/usr/local/mysql #datadir=/usr/local/mysql/data #bindir=/usr/local/mysql/bin #sbindir=/usr/local/mysql/bin #libexecdir=/usr/local/mysql/bin iftest -z "$basedir" then basedir=/usr/local/mysql bindir=/usr/local/mysql/bin iftest -z "$datadir" then datadir=/usr/local/mysql/data fi sbindir=/usr/local/mysql/bin libexecdir=/usr/local/mysql/bin else bindir="$basedir/bin"#ok iftest -z "$datadir" then datadir="$basedir/data" fi sbindir="$basedir/sbin"#ok libexecdir="$basedir/libexec"#ok fi
# datadir_set is used to determine if datadir was set (and so should be # *not* set inside of the --basedir= handler.) datadir_set=
# # Use LSB init script functions for printing messages, if possible # lsb_functions="/lib/lsb/init-functions" iftest -f $lsb_functions ; then#文件存在,且是正规文件 . $lsb_functions else log_success_msg() { echo" SUCCESS! $@"#$@ 所有参数列表 } log_failure_msg() { echo" ERROR! $@" } fi
other_args="$*"# uncommon, but needed when called from an RPM upgrade action # Expected: "--skip-networking --skip-grant-tables" # They are not checked here, intentionally, as it is the resposibility # of the "spec" file author to give correct arguments only.
case `echo"testing\c"`,`echo -n testing` in *c*,-n*) echo_n= echo_c= ;; *c*,*) echo_n=-n echo_c= ;; *) echo_n= echo_c='\c' ;; esac
parse_server_arguments() { for arg do case"$arg"in --basedir=*) basedir=`echo"$arg" | sed -e 's/^[^=]*=//'` bindir="$basedir/bin" iftest -z "$datadir_set"; then datadir="$basedir/data" fi sbindir="$basedir/sbin" libexecdir="$basedir/libexec" ;; --datadir=*) datadir=`echo"$arg" | sed -e 's/^[^=]*=//'` datadir_set=1 ;; --pid-file=*) mysqld_pid_file_path=`echo"$arg" | sed -e 's/^[^=]*=//'` ;; --service-startup-timeout=*) service_startup_timeout=`echo"$arg" | sed -e 's/^[^=]*=//'` ;; esac done }
wait_for_pid () { verb="$1"# created | removed pid="$2"# process ID of the program operating on the pid-file pid_file_path="$3"# path to the PID file.
i=0 avoid_race_condition="by checking again"
whiletest$i -ne $service_startup_timeout ; do
case"$verb"in 'created') # wait for a PID-file to pop into existence. test -s "$pid_file_path" && i='' && break ;; 'removed') # wait for this PID-file to disappear test ! -s "$pid_file_path" && i='' && break ;; *) echo"wait_for_pid () usage: wait_for_pid created|removed pid pid_file_path" exit 1 ;; esac
# if server isn't running, then pid-file will never be updated iftest -n "$pid"; then ifkill -0 "$pid" 2>/dev/null; then : # the server still runs else # The server may have exited between the last pid-file check and now. iftest -n "$avoid_race_condition"; then avoid_race_condition="" continue# Check again. fi
# there's nothing that will affect the file. log_failure_msg "The server quit without updating PID file ($pid_file_path)." return 1 # not waiting any more. fi fi
echo$echo_n".$echo_c" i=`expr$i + 1` sleep 1
done
iftest -z "$i" ; then log_success_msg return 0 else log_failure_msg return 1 fi }
# Get arguments from the my.cnf file, # the only group, which is read from now on is [mysqld] iftest -x "$bindir/my_print_defaults"; then print_defaults="$bindir/my_print_defaults"#ok else # Try to find basedir in /etc/my.cnf conf=/etc/my.cnf print_defaults= iftest -r $conf then subpat='^[^=]*basedir[^=]*=\(.*\)$' dirs=`sed -e "/$subpat/!d" -e 's//\1/'$conf` for d in$dirs do d=`echo$d | sed -e 's/[ ]//g'` iftest -x "$d/bin/my_print_defaults" then print_defaults="$d/bin/my_print_defaults" break fi done fi
# Hope it's in the PATH ... but I doubt it test -z "$print_defaults" && print_defaults="my_print_defaults" fi
# # Read defaults file from 'basedir'. If there is no defaults file there # check if it's in the old (depricated) place (datadir) and read it from there #
extra_args="" iftest -r "$basedir/my.cnf" then extra_args="-e $basedir/my.cnf" fi
parse_server_arguments `$print_defaults$extra_args mysqld server mysql_server mysql.server`
# # Set pid file if not given 设置pid # iftest -z "$mysqld_pid_file_path"#如果mysqld_pid_file_path没设置 then mysqld_pid_file_path=$datadir/`hostname`.pid else case"$mysqld_pid_file_path"in /* ) ;; * ) mysqld_pid_file_path="$datadir/$mysqld_pid_file_path" ;; esac fi
echo$echo_n"Starting MySQL" iftest -x $bindir/mysqld_safe then # Give extra arguments to mysqld with the my.cnf file. This script # may be overwritten at next upgrade. #--defaults-file要作为第一个参数出现 $bindir/mysqld_safe --defaults-file="$datadir/my3307.cnf" --datadir="$datadir" --pid-file="$mysqld_pid_file_path"$other_args >/dev/null & wait_for_pid created "$!""$mysqld_pid_file_path"; return_value=$?
# Make lock for RedHat / SuSE iftest -w "$lockdir" then touch"$lock_file_path" fi
exit$return_value else log_failure_msg "Couldn't find MySQL server ($bindir/mysqld_safe)" fi ;;
'stop') # Stop daemon. We use a signal here to avoid having to know the # root password.
iftest -s "$mysqld_pid_file_path" then # signal mysqld_safe that it needs to stop touch"$mysqld_pid_file_path.shutdown"
mysqld_pid=`cat"$mysqld_pid_file_path"`
if (kill -0 $mysqld_pid 2>/dev/null) then echo$echo_n"Shutting down MySQL" kill$mysqld_pid # mysqld should remove the pid file when it exits, so wait for it. wait_for_pid removed "$mysqld_pid""$mysqld_pid_file_path"; return_value=$? else log_failure_msg "MySQL server process #$mysqld_pid is not running!" rm"$mysqld_pid_file_path" fi
# Delete lock for RedHat / SuSE iftest -f "$lock_file_path" then rm -f "$lock_file_path" fi exit$return_value else log_failure_msg "MySQL server PID file could not be found!" fi ;;
'restart') # Stop the service and regardless of whether it was # running or not, start it again. if$0 stop $other_args; then $0 start $other_args else log_failure_msg "Failed to stop running server, so refusing to try to start." exit 1 fi ;;
'reload'|'force-reload') iftest -s "$mysqld_pid_file_path" ; then read mysqld_pid < "$mysqld_pid_file_path" kill -HUP $mysqld_pid && log_success_msg "Reloading service MySQL"#平滑更新服务配置 touch"$mysqld_pid_file_path" else log_failure_msg "MySQL PID file could not be found!" exit 1 fi ;; 'status') # First, check to see if pid file exists iftest -s "$mysqld_pid_file_path" ; then read mysqld_pid < "$mysqld_pid_file_path" ifkill -0 $mysqld_pid 2>/dev/null ; then log_success_msg "MySQL running ($mysqld_pid)" exit 0 else log_failure_msg "MySQL is not running, but PID file exists" exit 1 fi else # Try to find appropriate mysqld process mysqld_pid=`pidof $libexecdir/mysqld`
# test if multiple pids exist pid_count=`echo$mysqld_pid | wc -w` iftest$pid_count -gt 1 ; then log_failure_msg "Multiple MySQL running but PID file could not be found ($mysqld_pid)" exit 5 eliftest -z $mysqld_pid ; then iftest -f "$lock_file_path" ; then log_failure_msg "MySQL is not running, but lock file ($lock_file_path) exists" exit 2 fi log_failure_msg "MySQL is not running" exit 3 else log_failure_msg "MySQL is running but PID file could not be found" exit 4 fi fi ;; *) # usage basename=`basename"$0"` echo"Usage: $basename {start|stop|restart|reload|force-reload|status} [ MySQL server options ]" exit 1 ;; esac
