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8977c8fa98
Problem Description: A mysqld_safe instance is started. An InnoDB crash recovery begins which takes few seconds to complete. During this crash recovery process happening, another mysqld_safe instance is started with the same server startup parameters. Since the mysqld's pid file is absent during the crash recovery process the second instance assumes there is no other process and tries to acquire a lock on the ibdata files in the datadir. But this step fails and the 2nd instance keeps retrying 100 times each with a delay of 1 second. Now after the 100 attempts, the server goes down, but while going down it hits the mysqld_safe script's cleanup section and without any check it blindly deletes the socket and pid files. Since no lock is placed on the socket file, it gets deleted. Solution: We create a mysqld_safe.pid file in the datadir, which protects the presence server instance resources by storing the mysqld_safe's process id in it. We place a check if the mysqld_safe.pid file is existing in the datadir. If yes then we check if the pid it contains is an active pid or not. If yes again, then the scripts logs an error saying "A mysqld_safe instance is already running". Otherwise it will log the present mysqld_safe's pid into the mysqld_safe.pid file.
678 lines
19 KiB
Bash
678 lines
19 KiB
Bash
#!/bin/sh
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# Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
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# This file is public domain and comes with NO WARRANTY of any kind
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#
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# Script to start the MySQL daemon and restart it if it dies unexpectedly
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#
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# This should be executed in the MySQL base directory if you are using a
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# binary installation that is not installed in its compile-time default
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# location
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#
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# mysql.server works by first doing a cd to the base directory and from there
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# executing mysqld_safe
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KILL_MYSQLD=1;
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MYSQLD=
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niceness=0
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# Initial logging status: error log is not open, and not using syslog
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logging=init
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want_syslog=0
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syslog_tag=
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user='@MYSQLD_USER@'
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pid_file=
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err_log=
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syslog_tag_mysqld=mysqld
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syslog_tag_mysqld_safe=mysqld_safe
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trap '' 1 2 3 15 # we shouldn't let anyone kill us
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# MySQL-specific environment variable. First off, it's not really a umask,
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# it's the desired mode. Second, it follows umask(2), not umask(3) in that
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# octal needs to be explicit. Our shell might be a proper sh without printf,
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# multiple-base arithmetic, and binary arithmetic, so this will get ugly.
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# We reject decimal values to keep things at least half-sane.
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umask 007 # fallback
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UMASK="${UMASK-0640}"
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fmode=`echo "$UMASK" | sed -e 's/[^0246]//g'`
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octalp=`echo "$fmode"|cut -c1`
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fmlen=`echo "$fmode"|wc -c|sed -e 's/ //g'`
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if [ "x$octalp" != "x0" -o "x$UMASK" != "x$fmode" -o "x$fmlen" != "x5" ]
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then
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fmode=0640
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echo "UMASK must be a 3-digit mode with an additional leading 0 to indicate octal." >&2
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echo "The first digit will be corrected to 6, the others may be 0, 2, 4, or 6." >&2
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fi
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fmode=`echo "$fmode"|cut -c3-4`
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fmode="6$fmode"
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if [ "x$UMASK" != "x0$fmode" ]
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then
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echo "UMASK corrected from $UMASK to 0$fmode ..."
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fi
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defaults=
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case "$1" in
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--no-defaults|--defaults-file=*|--defaults-extra-file=*)
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defaults="$1"; shift
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;;
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esac
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usage () {
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cat <<EOF
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Usage: $0 [OPTIONS]
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--no-defaults Don't read the system defaults file
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--defaults-file=FILE Use the specified defaults file
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--defaults-extra-file=FILE Also use defaults from the specified file
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--ledir=DIRECTORY Look for mysqld in the specified directory
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--open-files-limit=LIMIT Limit the number of open files
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--core-file-size=LIMIT Limit core files to the specified size
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--timezone=TZ Set the system timezone
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--mysqld=FILE Use the specified file as mysqld
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--mysqld-version=VERSION Use "mysqld-VERSION" as mysqld
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--nice=NICE Set the scheduling priority of mysqld
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--skip-kill-mysqld Don't try to kill stray mysqld processes
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--syslog Log messages to syslog with 'logger'
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--skip-syslog Log messages to error log (default)
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--syslog-tag=TAG Pass -t "mysqld-TAG" to 'logger'
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All other options are passed to the mysqld program.
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EOF
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exit 1
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}
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my_which ()
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{
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save_ifs="${IFS-UNSET}"
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IFS=:
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ret=0
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for file
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do
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for dir in $PATH
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do
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if [ -f "$dir/$file" ]
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then
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echo "$dir/$file"
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continue 2
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fi
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done
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ret=1 #signal an error
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break
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done
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if [ "$save_ifs" = UNSET ]
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then
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unset IFS
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else
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IFS="$save_ifs"
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fi
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return $ret # Success
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}
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log_generic () {
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priority="$1"
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shift
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msg="`date +'%y%m%d %H:%M:%S'` mysqld_safe $*"
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echo "$msg"
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case $logging in
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init) ;; # Just echo the message, don't save it anywhere
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file) echo "$msg" >> "$err_log" ;;
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syslog) logger -t "$syslog_tag_mysqld_safe" -p "$priority" "$*" ;;
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*)
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echo "Internal program error (non-fatal):" \
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" unknown logging method '$logging'" >&2
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;;
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esac
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}
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log_error () {
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log_generic daemon.error "$@" >&2
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}
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log_notice () {
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log_generic daemon.notice "$@"
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}
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eval_log_error () {
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cmd="$1"
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case $logging in
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file) cmd="$cmd >> "`shell_quote_string "$err_log"`" 2>&1" ;;
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syslog)
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# mysqld often prefixes its messages with a timestamp, which is
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# redundant when logging to syslog (which adds its own timestamp)
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# However, we don't strip the timestamp with sed here, because
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# sed buffers output (only GNU sed supports a -u (unbuffered) option)
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# which means that messages may not get sent to syslog until the
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# mysqld process quits.
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cmd="$cmd 2>&1 | logger -t '$syslog_tag_mysqld' -p daemon.error"
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;;
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*)
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echo "Internal program error (non-fatal):" \
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" unknown logging method '$logging'" >&2
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;;
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esac
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#echo "Running mysqld: [$cmd]"
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eval "$cmd"
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}
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shell_quote_string() {
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# This sed command makes sure that any special chars are quoted,
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# so the arg gets passed exactly to the server.
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echo "$1" | sed -e 's,\([^a-zA-Z0-9/_.=-]\),\\\1,g'
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}
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parse_arguments() {
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# We only need to pass arguments through to the server if we don't
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# handle them here. So, we collect unrecognized options (passed on
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# the command line) into the args variable.
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pick_args=
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if test "$1" = PICK-ARGS-FROM-ARGV
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then
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pick_args=1
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shift
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fi
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for arg do
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val=`echo "$arg" | sed -e "s;--[^=]*=;;"`
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case "$arg" in
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# these get passed explicitly to mysqld
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--basedir=*) MY_BASEDIR_VERSION="$val" ;;
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--datadir=*) DATADIR="$val" ;;
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--pid-file=*) pid_file="$val" ;;
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--user=*) user="$val"; SET_USER=1 ;;
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# these might have been set in a [mysqld_safe] section of my.cnf
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# they are added to mysqld command line to override settings from my.cnf
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--log-error=*) err_log="$val" ;;
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--port=*) mysql_tcp_port="$val" ;;
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--socket=*) mysql_unix_port="$val" ;;
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# mysqld_safe-specific options - must be set in my.cnf ([mysqld_safe])!
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--core-file-size=*) core_file_size="$val" ;;
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--ledir=*) ledir="$val" ;;
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--mysqld=*) MYSQLD="$val" ;;
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--mysqld-version=*)
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if test -n "$val"
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then
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MYSQLD="mysqld-$val"
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else
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MYSQLD="mysqld"
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fi
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;;
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--nice=*) niceness="$val" ;;
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--open-files-limit=*) open_files="$val" ;;
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--open_files_limit=*) open_files="$val" ;;
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--skip-kill-mysqld*) KILL_MYSQLD=0 ;;
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--syslog) want_syslog=1 ;;
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--skip-syslog) want_syslog=0 ;;
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--syslog-tag=*) syslog_tag="$val" ;;
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--timezone=*) TZ="$val"; export TZ; ;;
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--help) usage ;;
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*)
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if test -n "$pick_args"
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then
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append_arg_to_args "$arg"
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fi
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;;
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esac
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done
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}
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#
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# First, try to find BASEDIR and ledir (where mysqld is)
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#
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if echo '@pkgdatadir@' | grep '^@prefix@' > /dev/null
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then
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relpkgdata=`echo '@pkgdatadir@' | sed -e 's,^@prefix@,,' -e 's,^/,,' -e 's,^,./,'`
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else
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# pkgdatadir is not relative to prefix
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relpkgdata='@pkgdatadir@'
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fi
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MY_PWD=`pwd`
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# Check for the directories we would expect from a binary release install
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if test -n "$MY_BASEDIR_VERSION" -a -d "$MY_BASEDIR_VERSION"
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then
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# BASEDIR is already overridden on command line. Do not re-set.
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# Use BASEDIR to discover le.
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if test -x "$MY_BASEDIR_VERSION/libexec/mysqld"
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then
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ledir="$MY_BASEDIR_VERSION/libexec"
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else
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ledir="$MY_BASEDIR_VERSION/bin"
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fi
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elif test -f "$relpkgdata"/english/errmsg.sys -a -x "$MY_PWD/bin/mysqld"
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then
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MY_BASEDIR_VERSION="$MY_PWD" # Where bin, share and data are
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ledir="$MY_PWD/bin" # Where mysqld is
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# Check for the directories we would expect from a source install
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elif test -f "$relpkgdata"/english/errmsg.sys -a -x "$MY_PWD/libexec/mysqld"
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then
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MY_BASEDIR_VERSION="$MY_PWD" # Where libexec, share and var are
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ledir="$MY_PWD/libexec" # Where mysqld is
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# Since we didn't find anything, used the compiled-in defaults
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else
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MY_BASEDIR_VERSION='@prefix@'
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ledir='@libexecdir@'
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fi
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#
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# Second, try to find the data directory
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#
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# Try where the binary installs put it
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if test -d $MY_BASEDIR_VERSION/data/mysql
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then
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DATADIR=$MY_BASEDIR_VERSION/data
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if test -z "$defaults" -a -r "$DATADIR/my.cnf"
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then
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defaults="--defaults-extra-file=$DATADIR/my.cnf"
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fi
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# Next try where the source installs put it
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elif test -d $MY_BASEDIR_VERSION/var/mysql
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then
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DATADIR=$MY_BASEDIR_VERSION/var
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# Or just give up and use our compiled-in default
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else
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DATADIR=@localstatedir@
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fi
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if test -z "$MYSQL_HOME"
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then
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if test -r "$MY_BASEDIR_VERSION/my.cnf" && test -r "$DATADIR/my.cnf"
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then
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log_error "WARNING: Found two instances of my.cnf -
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$MY_BASEDIR_VERSION/my.cnf and
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$DATADIR/my.cnf
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IGNORING $DATADIR/my.cnf"
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MYSQL_HOME=$MY_BASEDIR_VERSION
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elif test -r "$DATADIR/my.cnf"
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then
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log_error "WARNING: Found $DATADIR/my.cnf
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The data directory is a deprecated location for my.cnf, please move it to
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$MY_BASEDIR_VERSION/my.cnf"
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MYSQL_HOME=$DATADIR
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else
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MYSQL_HOME=$MY_BASEDIR_VERSION
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fi
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fi
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export MYSQL_HOME
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# Get first arguments from the my.cnf file, groups [mysqld] and [mysqld_safe]
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# and then merge with the command line arguments
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if test -x "$MY_BASEDIR_VERSION/bin/my_print_defaults"
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then
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print_defaults="$MY_BASEDIR_VERSION/bin/my_print_defaults"
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elif test -x ./bin/my_print_defaults
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then
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print_defaults="./bin/my_print_defaults"
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elif test -x @bindir@/my_print_defaults
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then
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print_defaults="@bindir@/my_print_defaults"
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elif test -x @bindir@/mysql_print_defaults
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then
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print_defaults="@bindir@/mysql_print_defaults"
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else
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print_defaults="my_print_defaults"
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fi
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append_arg_to_args () {
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args="$args "`shell_quote_string "$1"`
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}
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args=
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SET_USER=2
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parse_arguments `$print_defaults $defaults --loose-verbose mysqld server`
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if test $SET_USER -eq 2
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then
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SET_USER=0
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fi
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parse_arguments `$print_defaults $defaults --loose-verbose mysqld_safe safe_mysqld`
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parse_arguments PICK-ARGS-FROM-ARGV "$@"
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# A pid file is created for the mysqld_safe process. This file protects the
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# server instance resources during race conditions.
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safe_pid="$DATADIR/mysqld_safe.pid"
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if test -f $safe_pid
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then
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PID=`cat "$safe_pid"`
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if @CHECK_PID@
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then
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if @FIND_PROC@
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then
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log_error "A mysqld_safe process already exists"
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exit 1
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fi
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fi
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rm -f "$safe_pid"
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if test -f "$safe_pid"
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then
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log_error "Fatal error: Can't remove the mysqld_safe pid file"
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exit 1
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fi
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fi
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# Insert pid proerply into the pid file.
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ps -e | grep [m]ysqld_safe | awk '{print $1}' | sed -n 1p > $safe_pid
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# End of mysqld_safe pid(safe_pid) check.
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# Determine what logging facility to use
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# Ensure that 'logger' exists, if it's requested
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if [ $want_syslog -eq 1 ]
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then
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my_which logger > /dev/null 2>&1
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if [ $? -ne 0 ]
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then
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log_error "--syslog requested, but no 'logger' program found. Please ensure that 'logger' is in your PATH, or do not specify the --syslog option to mysqld_safe."
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rm -f "$safe_pid" # Clean Up of mysqld_safe.pid file.
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exit 1
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fi
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fi
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if [ -n "$err_log" -o $want_syslog -eq 0 ]
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then
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if [ -n "$err_log" ]
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then
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# mysqld adds ".err" if there is no extension on the --log-error
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# argument; must match that here, or mysqld_safe will write to a
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# different log file than mysqld
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# mysqld does not add ".err" to "--log-error=foo."; it considers a
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# trailing "." as an extension
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if expr "$err_log" : '.*\.[^/]*$' > /dev/null
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then
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:
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else
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err_log="$err_log".err
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fi
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case "$err_log" in
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/* ) ;;
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* ) err_log="$DATADIR/$err_log" ;;
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esac
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else
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err_log=$DATADIR/`@HOSTNAME@`.err
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fi
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append_arg_to_args "--log-error=$err_log"
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if [ $want_syslog -eq 1 ]
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then
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# User explicitly asked for syslog, so warn that it isn't used
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log_error "Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect."
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fi
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# Log to err_log file
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log_notice "Logging to '$err_log'."
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logging=file
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if [ ! -f "$err_log" ]; then # if error log already exists,
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touch "$err_log" # we just append. otherwise,
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chmod "$fmode" "$err_log" # fix the permissions here!
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fi
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else
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if [ -n "$syslog_tag" ]
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then
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# Sanitize the syslog tag
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syslog_tag=`echo "$syslog_tag" | sed -e 's/[^a-zA-Z0-9_-]/_/g'`
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syslog_tag_mysqld_safe="${syslog_tag_mysqld_safe}-$syslog_tag"
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syslog_tag_mysqld="${syslog_tag_mysqld}-$syslog_tag"
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fi
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log_notice "Logging to syslog."
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logging=syslog
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fi
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USER_OPTION=""
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if test -w / -o "$USER" = "root"
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then
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if test "$user" != "root" -o $SET_USER = 1
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then
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USER_OPTION="--user=$user"
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fi
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# Change the err log to the right user, if it is in use
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if [ $want_syslog -eq 0 ]; then
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touch "$err_log"
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chown $user "$err_log"
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fi
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if test -n "$open_files"
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then
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ulimit -n $open_files
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fi
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fi
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if test -n "$open_files"
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then
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append_arg_to_args "--open-files-limit=$open_files"
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fi
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safe_mysql_unix_port=${mysql_unix_port:-${MYSQL_UNIX_PORT:-@MYSQL_UNIX_ADDR@}}
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# Make sure that directory for $safe_mysql_unix_port exists
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mysql_unix_port_dir=`dirname $safe_mysql_unix_port`
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if [ ! -d $mysql_unix_port_dir ]
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then
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mkdir $mysql_unix_port_dir
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chown $user $mysql_unix_port_dir
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chmod 755 $mysql_unix_port_dir
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fi
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# If the user doesn't specify a binary, we assume name "mysqld"
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if test -z "$MYSQLD"
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then
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MYSQLD=mysqld
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fi
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if test ! -x "$ledir/$MYSQLD"
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then
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log_error "The file $ledir/$MYSQLD
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does not exist or is not executable. Please cd to the mysql installation
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directory and restart this script from there as follows:
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./bin/mysqld_safe&
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See http://dev.mysql.com/doc/mysql/en/mysqld-safe.html for more information"
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rm -f "$safe_pid" # Clean Up of mysqld_safe.pid file.
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exit 1
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fi
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|
|
if test -z "$pid_file"
|
|
then
|
|
pid_file="$DATADIR/`@HOSTNAME@`.pid"
|
|
else
|
|
case "$pid_file" in
|
|
/* ) ;;
|
|
* ) pid_file="$DATADIR/$pid_file" ;;
|
|
esac
|
|
fi
|
|
append_arg_to_args "--pid-file=$pid_file"
|
|
|
|
if test -n "$mysql_unix_port"
|
|
then
|
|
append_arg_to_args "--socket=$mysql_unix_port"
|
|
fi
|
|
if test -n "$mysql_tcp_port"
|
|
then
|
|
append_arg_to_args "--port=$mysql_tcp_port"
|
|
fi
|
|
|
|
if test $niceness -eq 0
|
|
then
|
|
NOHUP_NICENESS="nohup"
|
|
else
|
|
NOHUP_NICENESS="nohup nice -$niceness"
|
|
fi
|
|
|
|
# Using nice with no args to get the niceness level is GNU-specific.
|
|
# This check could be extended for other operating systems (e.g.,
|
|
# BSD could use "nohup sh -c 'ps -o nice -p $$' | tail -1").
|
|
# But, it also seems that GNU nohup is the only one which messes
|
|
# with the priority, so this is okay.
|
|
if nohup nice > /dev/null 2>&1
|
|
then
|
|
normal_niceness=`nice`
|
|
nohup_niceness=`nohup nice 2>/dev/null`
|
|
|
|
numeric_nice_values=1
|
|
for val in $normal_niceness $nohup_niceness
|
|
do
|
|
case "$val" in
|
|
-[0-9] | -[0-9][0-9] | -[0-9][0-9][0-9] | \
|
|
[0-9] | [0-9][0-9] | [0-9][0-9][0-9] )
|
|
;;
|
|
* )
|
|
numeric_nice_values=0 ;;
|
|
esac
|
|
done
|
|
|
|
if test $numeric_nice_values -eq 1
|
|
then
|
|
nice_value_diff=`expr $nohup_niceness - $normal_niceness`
|
|
if test $? -eq 0 && test $nice_value_diff -gt 0 && \
|
|
nice --$nice_value_diff echo testing > /dev/null 2>&1
|
|
then
|
|
# nohup increases the priority (bad), and we are permitted
|
|
# to lower the priority with respect to the value the user
|
|
# might have been given
|
|
niceness=`expr $niceness - $nice_value_diff`
|
|
NOHUP_NICENESS="nice -$niceness nohup"
|
|
fi
|
|
fi
|
|
else
|
|
if nohup echo testing > /dev/null 2>&1
|
|
then
|
|
:
|
|
else
|
|
# nohup doesn't work on this system
|
|
NOHUP_NICENESS=""
|
|
fi
|
|
fi
|
|
|
|
# Try to set the core file size (even if we aren't root) because many systems
|
|
# don't specify a hard limit on core file size.
|
|
if test -n "$core_file_size"
|
|
then
|
|
ulimit -c $core_file_size
|
|
fi
|
|
|
|
#
|
|
# If there exists an old pid file, check if the daemon is already running
|
|
# Note: The switches to 'ps' may depend on your operating system
|
|
if test -f "$pid_file"
|
|
then
|
|
PID=`cat "$pid_file"`
|
|
if @CHECK_PID@
|
|
then
|
|
if @FIND_PROC@
|
|
then # The pid contains a mysqld process
|
|
log_error "A mysqld process already exists"
|
|
rm -f "$safe_pid" # Clean Up of mysqld_safe.pid file.
|
|
exit 1
|
|
fi
|
|
fi
|
|
rm -f "$pid_file"
|
|
if test -f "$pid_file"
|
|
then
|
|
log_error "Fatal error: Can't remove the pid file:
|
|
$pid_file
|
|
Please remove it manually and start $0 again;
|
|
mysqld daemon not started"
|
|
rm -f "$safe_pid" # Clean Up of mysqld_safe.pid file.
|
|
exit 1
|
|
fi
|
|
fi
|
|
|
|
#
|
|
# Uncomment the following lines if you want all tables to be automatically
|
|
# checked and repaired during startup. You should add sensible key_buffer
|
|
# and sort_buffer values to my.cnf to improve check performance or require
|
|
# less disk space.
|
|
# Alternatively, you can start mysqld with the "myisam-recover" option. See
|
|
# the manual for details.
|
|
#
|
|
# echo "Checking tables in $DATADIR"
|
|
# $MY_BASEDIR_VERSION/bin/myisamchk --silent --force --fast --medium-check $DATADIR/*/*.MYI
|
|
# $MY_BASEDIR_VERSION/bin/isamchk --silent --force $DATADIR/*/*.ISM
|
|
|
|
# Does this work on all systems?
|
|
#if type ulimit | grep "shell builtin" > /dev/null
|
|
#then
|
|
# ulimit -n 256 > /dev/null 2>&1 # Fix for BSD and FreeBSD systems
|
|
#fi
|
|
|
|
cmd="$NOHUP_NICENESS"
|
|
|
|
for i in "$ledir/$MYSQLD" "$defaults" "--basedir=$MY_BASEDIR_VERSION" \
|
|
"--datadir=$DATADIR" "$USER_OPTION"
|
|
do
|
|
cmd="$cmd "`shell_quote_string "$i"`
|
|
done
|
|
cmd="$cmd $args"
|
|
# Avoid 'nohup: ignoring input' warning
|
|
test -n "$NOHUP_NICENESS" && cmd="$cmd < /dev/null"
|
|
|
|
log_notice "Starting $MYSQLD daemon with databases from $DATADIR"
|
|
while true
|
|
do
|
|
rm -f $safe_mysql_unix_port "$pid_file" # Some extra safety
|
|
|
|
eval_log_error "$cmd"
|
|
|
|
if [ $want_syslog -eq 0 -a ! -f "$err_log" ]; then
|
|
touch "$err_log" # hypothetical: log was renamed but not
|
|
chown $user "$err_log" # flushed yet. we'd recreate it with
|
|
chmod "$fmode" "$err_log" # wrong owner next time we log, so set
|
|
fi # it up correctly while we can!
|
|
|
|
if test ! -f "$pid_file" # This is removed if normal shutdown
|
|
then
|
|
break
|
|
fi
|
|
|
|
if @TARGET_LINUX@ && test $KILL_MYSQLD -eq 1
|
|
then
|
|
# Test if one process was hanging.
|
|
# This is only a fix for Linux (running as base 3 mysqld processes)
|
|
# but should work for the rest of the servers.
|
|
# The only thing is ps x => redhat 5 gives warnings when using ps -x.
|
|
# kill -9 is used or the process won't react on the kill.
|
|
numofproces=`ps xaww | grep -v "grep" | grep "$ledir/$MYSQLD\>" | grep -c "pid-file=$pid_file"`
|
|
|
|
log_notice "Number of processes running now: $numofproces"
|
|
I=1
|
|
while test "$I" -le "$numofproces"
|
|
do
|
|
PROC=`ps xaww | grep "$ledir/$MYSQLD\>" | grep -v "grep" | grep "pid-file=$pid_file" | sed -n '$p'`
|
|
|
|
for T in $PROC
|
|
do
|
|
break
|
|
done
|
|
# echo "TEST $I - $T **"
|
|
if kill -9 $T
|
|
then
|
|
log_error "$MYSQLD process hanging, pid $T - killed"
|
|
else
|
|
break
|
|
fi
|
|
I=`expr $I + 1`
|
|
done
|
|
fi
|
|
log_notice "mysqld restarted"
|
|
done
|
|
|
|
log_notice "mysqld from pid file $pid_file ended"
|
|
|
|
rm -f "$safe_pid" # Some Extra Safety. File is deleted
|
|
# once the mysqld process ends.
|