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#!/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
#
# Script to start the MySQL daemon and restart it if it dies unexpectedly
#
# This should be executed in the MySQL base directory if you are using a
# binary installation that is not installed in its compile-time default
# location
#
# mysql.server works by first doing a cd to the base directory and from there
# executing mysqld_safe
# Initialize script globals
KILL_MYSQLD=1;
MYSQLD=
niceness=0
nowatch=0
mysqld_ld_preload=
mysqld_ld_library_path=
flush_caches=0
numa_interleave=0
wsrep_on=0
dry_run=0
defaults_group_suffix=
# Initial logging status: error log is not open, and not using syslog
logging=init
want_syslog=0
syslog_tag=
user='mysql'
group='mysql'
pid_file=
err_log=
err_log_base=
skip_err_log=0
syslog_tag_mysqld=mysqld
syslog_tag_mysqld_safe=mysqld_safe
trap '' 1 2 3 15 # we shouldn't let anyone kill us
# MySQL-specific environment variable. First off, it's not really a umask,
# it's the desired mode. Second, it follows umask(2), not umask(3) in that
# octal needs to be explicit. Our shell might be a proper sh without printf,
# multiple-base arithmetic, and binary arithmetic, so this will get ugly.
# We reject decimal values to keep things at least half-sane.
umask 007 # fallback
UMASK="${UMASK-0640}"
fmode=`echo "$UMASK" | sed -e 's/[^0246]//g'`
octalp=`echo "$fmode"|cut -c1`
fmlen=`echo "$fmode"|wc -c|sed -e 's/ //g'`
if [ "x$octalp" != "x0" -o "x$UMASK" != "x$fmode" -o "x$fmlen" != "x5" ]
then
fmode=0640
echo "UMASK must be a 3-digit mode with an additional leading 0 to indicate octal." >&2
echo "The first digit will be corrected to 6, the others may be 0, 2, 4, or 6." >&2
fi
fmode=`echo "$fmode"|cut -c3-4`
fmode="6$fmode"
if [ "x$UMASK" != "x0$fmode" ]
then
echo "UMASK corrected from $UMASK to 0$fmode ..."
fi
defaults=
case "$1" in
--no-defaults|--defaults-file=*|--defaults-extra-file=*)
defaults="$1"; shift
;;
esac
usage () {
cat <<EOF
Usage: $0 [OPTIONS]
--no-defaults Don't read the system defaults file
--defaults-file=FILE Use the specified defaults file
--defaults-extra-file=FILE Also use defaults from the specified file
--defaults-group-suffix=X Additionally read default groups with X appended
as a suffix
--ledir=DIRECTORY Look for mysqld in the specified directory
--open-files-limit=LIMIT Limit the number of open files
--crash-script=FILE Script to call when mysqld crashes
--core-file-size=LIMIT Limit core files to the specified size
--timezone=TZ Set the system timezone
--malloc-lib=LIB Preload shared library LIB if available
--mysqld=FILE Use the specified file as mysqld
--mysqld-version=VERSION Use "mysqld-VERSION" as mysqld
--dry-run Simulate the start to detect errors but don't start
--nice=NICE Set the scheduling priority of mysqld
--no-auto-restart Exit after starting mysqld
--nowatch Exit after starting mysqld
--plugin-dir=DIR Plugins are under DIR or DIR/VERSION, if
VERSION is given
--skip-kill-mysqld Don't try to kill stray mysqld processes
--syslog Log messages to syslog with 'logger'
--skip-syslog Log messages to error log (default)
--syslog-tag=TAG Pass -t "mysqld-TAG" to 'logger'
--flush-caches Flush and purge buffers/caches before
starting the server
--numa-interleave Run mysqld with its memory interleaved
on all NUMA nodes
All other options are passed to the mysqld program.
EOF
exit 1
}
find_in_bin() {
if test -x "$MY_BASEDIR_VERSION/bin/$1"
then
echo "$MY_BASEDIR_VERSION/bin/$1"
elif test -x "/usr/bin/$1"
then
echo "/usr/bin/$1"
else
echo "$1"
fi
}
log_generic () {
[ $dry_run -eq 1 ] && return
priority="$1"
shift
msg="`date +'%y%m%d %H:%M:%S'` mysqld_safe $*"
echo "$msg"
case $logging in
init) ;; # Just echo the message, don't save it anywhere
file)
if [ "$helper_exist" -eq "0" ]; then
echo "$msg" | "$helper" "$user" log "$err_log"
fi
;;
syslog) logger -t "$syslog_tag_mysqld_safe" -p "$priority" "$*" ;;
*)
echo "Internal program error (non-fatal):" \
" unknown logging method '$logging'" >&2
;;
esac
}
log_error () {
log_generic daemon.error "$@" >&2
}
log_notice () {
log_generic daemon.notice "$@"
}
eval_log_error () {
local cmd="$1"
case $logging in
file)
if [ "$helper_exist" -eq "0" ]; then
cmd="$cmd 2>&1 | "`shell_quote_string "$helper"`" $user log "`shell_quote_string "$err_log"`
fi
;;
syslog)
# mysqld often prefixes its messages with a timestamp, which is
# redundant when logging to syslog (which adds its own timestamp)
# However, we don't strip the timestamp with sed here, because
# sed buffers output (only GNU sed supports a -u (unbuffered) option)
# which means that messages may not get sent to syslog until the
# mysqld process quits.
cmd="$cmd 2>&1 | logger -t '$syslog_tag_mysqld' -p daemon.error"
;;
*)
echo "Internal program error (non-fatal):" \
" unknown logging method '$logging'" >&2
;;
esac
if test $nowatch -eq 1
then
# We'd prefer to exec $cmd here, but SELinux needs to be fixed first
#/usr/bin/logger "Running mysqld: $cmd"
eval "$cmd &"
exit 0
else
#echo "Running mysqld: [$cmd]"
eval "$cmd"
fi
}
shell_quote_string() {
# This sed command makes sure that any special chars are quoted,
# so the arg gets passed exactly to the server.
echo "$1" | sed -e 's,\([^a-zA-Z0-9/_.=-]\),\\\1,g'
}
wsrep_pick_url() {
[ $# -eq 0 ] && return 0
log_error "WSREP: 'wsrep_urls' is DEPRECATED! Use wsrep_cluster_address to specify multiple addresses instead."
if ! command -v nc >/dev/null
then
log_error "ERROR: nc tool not found in PATH! Make sure you have it installed."
return 1
fi
local url
# Assuming URL in the form scheme://host:port
# If host and port are not NULL, the liveness of URL is assumed to be tested
# If port part is absent, the url is returned literally and unconditionally
# If every URL has port but none is reachable, nothing is returned
for url in `echo $@ | sed s/,/\ /g` 0; do
local host=`echo $url | cut -d \: -f 2 | sed s/^\\\/\\\///`
local port=`echo $url | cut -d \: -f 3`
[ -z "$port" ] && break
nc -z "$host" $port >/dev/null && break
done
if [ "$url" == "0" ]; then
log_error "ERROR: none of the URLs in '$@' is reachable."
return 1
fi
echo $url
}
# Run mysqld with --wsrep-recover and parse recovered position from log.
# Position will be stored in wsrep_start_position_opt global.
wsrep_start_position_opt=""
wsrep_recover_position() {
local mysqld_cmd="$@"
local euid=$(id -u)
local ret=0
local wr_logfile=$(mktemp /tmp/wsrep_recovery.XXXXXX)
# safety checks
if [ -z $wr_logfile ]; then
log_error "WSREP: mktemp failed"
return 1
fi
if [ -f $wr_logfile ]; then
# NOTE! Do not change ownership of the temporary file, as on newer kernel
# versions fs.protected_regular is set to '2' and redirecting output with >
# as root to a file not owned by root will fail with "Permission denied"
chmod 600 $wr_logfile
else
log_error "WSREP: mktemp failed"
return 1
fi
local wr_pidfile="$DATADIR/"`hostname`"-recover.pid"
local wr_options="--disable-log-error --pid-file='$wr_pidfile'"
log_notice "WSREP: Running position recovery with $wr_options"
eval "$mysqld_cmd --wsrep_recover $wr_options 2> $wr_logfile"
if [ ! -s "$wr_logfile" ]; then
log_error "Log file $wr_logfile was empty, cannot proceed. Is system running fs.protected_regular?"
exit 1
fi
local rp="$(grep 'WSREP: Recovered position:' $wr_logfile)"
if [ -z "$rp" ]; then
local skipped="$(grep WSREP $wr_logfile | grep 'skipping position recovery')"
if [ -z "$skipped" ]; then
log_error "WSREP: Failed to recover position: '`cat $wr_logfile`'"
ret=1
else
log_notice "WSREP: Position recovery skipped"
fi
else
local start_pos="$(echo $rp | sed 's/.*WSREP\:\ Recovered\ position://' \
| sed 's/^[ \t]*//')"
log_notice "WSREP: Recovered position $start_pos"
wsrep_start_position_opt="--wsrep_start_position=$start_pos"
fi
[ $ret -eq 0 ] && rm $wr_logfile
return $ret
}
parse_arguments() {
for arg do
val=`echo "$arg" | sed -e "s;--[^=]*=;;"`
case "$arg" in
# these get passed explicitly to mysqld
--basedir=*) MY_BASEDIR_VERSION="$val" ;;
--datadir=*|--data=*) DATADIR="$val" ;;
--pid[-_]file=*) pid_file="$val" ;;
--plugin[-_]dir=*) PLUGIN_DIR="$val" ;;
--user=*) user="$val"; SET_USER=1 ;;
--group=*) group="$val"; SET_USER=1 ;;
--log[-_]basename=*|--hostname=*|--loose[-_]log[-_]basename=*)
pid_file="$val.pid";
err_log_base="$val";
;;
# these might have been set in a [mysqld_safe] section of my.cnf
# they are added to mysqld command line to override settings from my.cnf
--skip[-_]log[-_]error)
err_log=;
skip_err_log=1;
;;
--log[-_]error=*)
err_log="$val";
skip_err_log=0;
;;
--port=*) mysql_tcp_port="$val" ;;
--socket=*) mysql_unix_port="$val" ;;
# mysqld_safe-specific options - must be set in my.cnf ([mysqld_safe])!
--core[-_]file[-_]size=*) core_file_size="$val" ;;
--ledir=*) ledir="$val" ;;
--malloc[-_]lib=*) set_malloc_lib "$val" ;;
--crash[-_]script=*) crash_script="$val" ;;
--mysqld=*) MYSQLD="$val" ;;
--mysqld[-_]version=*)
if test -n "$val"
then
MYSQLD="mysqld-$val"
PLUGIN_VARIANT="/$val"
else
MYSQLD="mysqld"
fi
;;
--dry[-_]run) dry_run=1 ;;
--nice=*) niceness="$val" ;;
--nowatch|--no[-_]watch|--no[-_]auto[-_]restart) nowatch=1 ;;
--open[-_]files[-_]limit=*) open_files="$val" ;;
--skip[-_]kill[-_]mysqld*) KILL_MYSQLD=0 ;;
--syslog) want_syslog=1 ;;
--skip[-_]syslog) want_syslog=0 ;;
--syslog[-_]tag=*) syslog_tag="$val" ;;
--timezone=*) TZ="$val"; export TZ; ;;
--flush[-_]caches) flush_caches=1 ;;
--numa[-_]interleave) numa_interleave=1 ;;
--wsrep[-_]on)
wsrep_on=1
append_arg_to_args "$arg"
;;
--skip[-_]wsrep[-_]on)
wsrep_on=0
append_arg_to_args "$arg"
;;
--wsrep[-_]on=*)
if echo $val | grep -iq '\(ON\|1\)'; then
wsrep_on=1
else
wsrep_on=0
fi
append_arg_to_args "$arg"
;;
--wsrep[-_]urls=*) wsrep_urls="$val"; ;;
--wsrep[-_]provider=*)
if test -n "$val" && test "$val" != "none"
then
wsrep_restart=1
fi
append_arg_to_args "$arg"
;;
--defaults-group-suffix=*) defaults_group_suffix="$arg" ;;
--help) usage ;;
*)
case "$unrecognized_handling" in
collect) append_arg_to_args "$arg" ;;
complain) log_error "unknown option '$arg'" ;;
esac
esac
done
}
# Add a single shared library to the list of libraries which will be added to
# LD_PRELOAD for mysqld
#
# Since LD_PRELOAD is a space-separated value (for historical reasons), if a
# shared lib's path contains spaces, that path will be prepended to
# LD_LIBRARY_PATH and stripped from the lib value.
add_mysqld_ld_preload() {
lib_to_add="$1"
log_notice "Adding '$lib_to_add' to LD_PRELOAD for mysqld"
case "$lib_to_add" in
*' '*)
# Must strip path from lib, and add it to LD_LIBRARY_PATH
lib_file=`basename "$lib_to_add"`
case "$lib_file" in
*' '*)
# The lib file itself has a space in its name, and can't
# be used in LD_PRELOAD
log_error "library name '$lib_to_add' contains spaces and can not be used with LD_PRELOAD"
exit 1
;;
esac
lib_path=`dirname "$lib_to_add"`
lib_to_add="$lib_file"
[ -n "$mysqld_ld_library_path" ] && mysqld_ld_library_path="$mysqld_ld_library_path:"
mysqld_ld_library_path="$mysqld_ld_library_path$lib_path"
;;
esac
# LD_PRELOAD is a space-separated
[ -n "$mysqld_ld_preload" ] && mysqld_ld_preload="$mysqld_ld_preload "
mysqld_ld_preload="${mysqld_ld_preload}$lib_to_add"
}
# Returns LD_PRELOAD (and LD_LIBRARY_PATH, if needed) text, quoted to be
# suitable for use in the eval that calls mysqld.
#
# All values in mysqld_ld_preload are prepended to LD_PRELOAD.
mysqld_ld_preload_text() {
text=
if [ -n "$mysqld_ld_preload" ]; then
new_text="$mysqld_ld_preload"
[ -n "$LD_PRELOAD" ] && new_text="$new_text $LD_PRELOAD"
text="${text}LD_PRELOAD="`shell_quote_string "$new_text"`' '
fi
if [ -n "$mysqld_ld_library_path" ]; then
new_text="$mysqld_ld_library_path"
[ -n "$LD_LIBRARY_PATH" ] && new_text="$new_text:$LD_LIBRARY_PATH"
text="${text}LD_LIBRARY_PATH="`shell_quote_string "$new_text"`' '
fi
echo "$text"
}
# set_malloc_lib LIB
# - If LIB is empty, do nothing and return
# - If LIB starts with 'tcmalloc' or 'jemalloc', look for the shared library
# using `ldconfig`.
# tcmalloc is part of the Google perftools project.
# - If LIB is an absolute path, assume it is a malloc shared library
#
# Put LIB in mysqld_ld_preload, which will be added to LD_PRELOAD when
# running mysqld. See ld.so for details.
set_malloc_lib() {
malloc_lib="$1"
if expr "$malloc_lib" : "\(tcmalloc\|jemalloc\)" > /dev/null ; then
export PATH=$PATH:/sbin
if ! command -v ldconfig > /dev/null 2>&1
then
log_error "ldconfig command not found, required for ldconfig -p"
exit 1
fi
# format from ldconfig:
# "libjemalloc.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libjemalloc.so.1"
libmalloc_path="$(ldconfig -p | sed -n "/lib${malloc_lib}/p" | cut -d '>' -f2)"
if [ -z "$libmalloc_path" ]; then
log_error "no shared library for lib$malloc_lib.so.[0-9] found."
exit 1
fi
for f in $libmalloc_path; do
if [ -f "$f" ]; then
malloc_lib=$f # get the first path if many
break
fi
done
fi
# Allow --malloc-lib='' to override other settings
[ -z "$malloc_lib" ] && return
case "$malloc_lib" in
/*)
if [ ! -r "$malloc_lib" ]; then
log_error "--malloc-lib '$malloc_lib' can not be read and will not be used"
exit 1
fi
;;
*)
log_error "--malloc-lib must be an absolute path, 'tcmalloc' or " \
"'jemalloc'; ignoring value '$malloc_lib'"
exit 1
;;
esac
add_mysqld_ld_preload "$malloc_lib"
}
#
# First, try to find BASEDIR and ledir (where mysqld is)
#
MY_PWD=`dirname $0`
MY_PWD=`cd "$MY_PWD"/.. && pwd`
# Check for the directories we would expect from a binary release install
if test -n "$MY_BASEDIR_VERSION" -a -d "$MY_BASEDIR_VERSION"
then
# BASEDIR is already overridden on command line. Do not re-set.
# Use BASEDIR to discover le.
if test -x "$MY_BASEDIR_VERSION/libexec/mysqld"
then
ledir="$MY_BASEDIR_VERSION/libexec"
elif test -x "$MY_BASEDIR_VERSION/sbin/mysqld"
then
ledir="$MY_BASEDIR_VERSION/sbin"
else
ledir="$MY_BASEDIR_VERSION/bin"
fi
elif test -x "$MY_PWD/bin/mysqld"
then
MY_BASEDIR_VERSION="$MY_PWD" # Where bin, share and data are
ledir="$MY_PWD/bin" # Where mysqld is
# Check for the directories we would expect from a source install
elif test -x "$MY_PWD/libexec/mysqld"
then
MY_BASEDIR_VERSION="$MY_PWD" # Where libexec, share and var are
ledir="$MY_PWD/libexec" # Where mysqld is
elif test -x "$MY_PWD/sbin/mysqld"
then
MY_BASEDIR_VERSION="$MY_PWD" # Where sbin, share and var are
ledir="$MY_PWD/sbin" # Where mysqld is
# Since we didn't find anything, used the compiled-in defaults
else
MY_BASEDIR_VERSION='/usr'
ledir='/usr/sbin'
fi
helper=`find_in_bin mysqld_safe_helper`
print_defaults=`find_in_bin my_print_defaults`
# Check if helper exists
command -v $helper --help >/dev/null 2>&1
helper_exist=$?
#
# Second, try to find the data directory
#
# Try where the binary installs put it
if test -d $MY_BASEDIR_VERSION/data/mysql
then
DATADIR=$MY_BASEDIR_VERSION/data
# Next try where the source installs put it
elif test -d $MY_BASEDIR_VERSION/var/mysql
then
DATADIR=$MY_BASEDIR_VERSION/var
# Or just give up and use our compiled-in default
else
DATADIR=/var/lib/mysql
fi
if test -z "$MYSQL_HOME"
then
if test -r "$DATADIR/my.cnf"
then
log_error "WARNING: Found $DATADIR/my.cnf
The data directory is not a valid location for my.cnf, please move it to
$MY_BASEDIR_VERSION/my.cnf"
fi
MYSQL_HOME=$MY_BASEDIR_VERSION
fi
export MYSQL_HOME
append_arg_to_args () {
args="$args "`shell_quote_string "$1"`
}
args=
# Get first arguments from the my.cnf file, groups [mysqld] and [mysqld_safe]
# and then merge with the command line arguments
SET_USER=2
parse_arguments `$print_defaults $defaults --loose-verbose --mysqld`
if test $SET_USER -eq 2
then
SET_USER=0
fi
# If arguments come from [mysqld_safe] section of my.cnf
# we complain about unrecognized options
unrecognized_handling=complain
parse_arguments `$print_defaults $defaults --loose-verbose mysqld_safe safe_mysqld mariadb_safe`
# We only need to pass arguments through to the server if we don't
# handle them here. So, we collect unrecognized options (passed on
# the command line) into the args variable.
unrecognized_handling=collect
parse_arguments "$@"
#
# Try to find the plugin directory
#
# Use user-supplied argument
if [ -n "${PLUGIN_DIR}" ]; then
plugin_dir="${PLUGIN_DIR}"
else
# Try to find plugin dir relative to basedir
for dir in lib64/mysql/plugin lib64/plugin lib/mysql/plugin lib/plugin
do
if [ -d "${MY_BASEDIR_VERSION}/${dir}" ]; then
plugin_dir="${MY_BASEDIR_VERSION}/${dir}"
break
fi
done
# Give up and use compiled-in default
if [ -z "${plugin_dir}" ]; then
plugin_dir='/usr/lib64/mysql/plugin'
fi
fi
plugin_dir="${plugin_dir}${PLUGIN_VARIANT}"
# Determine what logging facility to use
# Ensure that 'logger' exists, if it's requested
if [ $want_syslog -eq 1 ]
then
if ! command -v logger > /dev/null
then
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."
exit 1
fi
fi
if [ $skip_err_log -eq 1 ]
then
append_arg_to_args "--skip-log-error"
fi
if [ -n "$err_log" -o $want_syslog -eq 0 ]
then
if [ -n "$err_log" ]
then
# mysqld adds ".err" if there is no extension on the --log-error
# argument; must match that here, or mysqld_safe will write to a
# different log file than mysqld
# mysqld does not add ".err" to "--log-error=foo."; it considers a
# trailing "." as an extension
if expr "$err_log" : '.*\.[^/]*$' > /dev/null
then
:
else
err_log="$err_log".err
fi
case "$err_log" in
/* ) ;;
* ) err_log="$DATADIR/$err_log" ;;
esac
else
if [ -n "$err_log_base" ]
then
err_log=$err_log_base.err
case "$err_log" in
/* ) ;;
* ) err_log="$DATADIR/$err_log" ;;
esac
else
err_log=$DATADIR/`hostname`.err
fi
fi
append_arg_to_args "--log-error=$err_log"
if [ $want_syslog -eq 1 ]
then
# User explicitly asked for syslog, so warn that it isn't used
log_error "Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect."
want_syslog=0
fi
# Log to err_log file
log_notice "Logging to '$err_log'."
logging=file
else
if [ -n "$syslog_tag" ]
then
# Sanitize the syslog tag
syslog_tag=`echo "$syslog_tag" | sed -e 's/[^a-zA-Z0-9_-]/_/g'`
syslog_tag_mysqld_safe="${syslog_tag_mysqld_safe}-$syslog_tag"
syslog_tag_mysqld="${syslog_tag_mysqld}-$syslog_tag"
fi
log_notice "Logging to syslog."
logging=syslog
fi
USER_OPTION=""
if test -w / -o "$USER" = "root"
then
if test "$user" != "root" -o $SET_USER = 1
then
USER_OPTION="--user=$user"
# To be used if/when we enable --system-group as an option to mysqld
GROUP_OPTION="--group=$group"
fi
if test -n "$open_files"
then
ulimit -n $open_files
fi
fi
if test -n "$open_files"
then
append_arg_to_args "--open-files-limit=$open_files"
fi
safe_mysql_unix_port=${mysql_unix_port:-${MYSQL_UNIX_PORT:-/var/lib/mysql/mysql.sock}}
# Make sure that directory for $safe_mysql_unix_port exists
mysql_unix_port_dir=`dirname $safe_mysql_unix_port`
if [ ! -d $mysql_unix_port_dir -a $dry_run -eq 0 ]
then
if ! mkdir -p $mysql_unix_port_dir
then
log_error "Fatal error Can't create database directory '$mysql_unix_port'"
exit 1
fi
if [ "$user" -a "$group" ]; then
chown $user:$group $mysql_unix_port_dir
else
[ "$user" ] && chown $user $mysql_unix_port_dir
[ "$group" ] && chgrp $group $mysql_unix_port_dir
fi
chmod 755 $mysql_unix_port_dir
fi
# If the user doesn't specify a binary, we assume name "mysqld"
if test -z "$MYSQLD"
then
MYSQLD=mysqld
fi
if test ! -x "$ledir/$MYSQLD"
then
log_error "The file $ledir/$MYSQLD
does not exist or is not executable. Please cd to the mysql installation
directory and restart this script from there as follows:
./bin/mysqld_safe&
See https://mariadb.com/kb/en/mysqld_safe for more information"
exit 1
fi
if test -z "$pid_file"
then
pid_file="`hostname`.pid"
fi
# MariaDB wants pid file without datadir
append_arg_to_args "--pid-file=$pid_file"
case "$pid_file" in
/* ) ;;
* ) pid_file="$DATADIR/$pid_file" ;;
esac
if test -n "$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" && [ $dry_run -eq 0 ]
then
PID=`cat "$pid_file"`
if kill -0 $PID > /dev/null 2> /dev/null
then
if ps wwwp $PID | grep -v mysqld_safe | grep -- $MYSQLD > /dev/null
then # The pid contains a mysqld process
log_error "A mysqld process already exists"
exit 1
fi
fi
rm -f "$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"
exit 1
fi
fi
#
# Flush and purge buffers/caches.
#
if true && test $flush_caches -eq 1
then
# Locate sync, ensure it exists.
if ! command -v sync > /dev/null
then
log_error "sync command not found, required for --flush-caches"
exit 1
# Flush file system buffers.
elif ! sync
then
# Huh, the sync() function is always successful...
log_error "sync failed, check if sync is properly installed"
fi
# Locate sysctl, ensure it exists.
if ! command -v sysctl > /dev/null
then
log_error "sysctl command not found, required for --flush-caches"
exit 1
# Purge page cache, dentries and inodes.
elif ! sysctl -q -w vm.drop_caches=3
then
log_error "sysctl failed, check the error message for details"
exit 1
fi
elif test $flush_caches -eq 1
then
log_error "--flush-caches is not supported on this platform"
exit 1
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 $DATADIR/*/*.ISM
# Does this work on all systems?
#if type ulimit | grep "shell builtin" > /dev/null
#then
# ulimit -n 256 > /dev/null 2>&1 # Fix for BSD and FreeBSD systems
#fi
cmd="`mysqld_ld_preload_text`$NOHUP_NICENESS"
[ $dry_run -eq 1 ] && cmd=''
#
# Set mysqld's memory interleave policy.
#
if true && test $numa_interleave -eq 1
then
# Locate numactl, ensure it exists.
if ! command -v numactl > /dev/null
then
log_error "numactl command not found, required for --numa-interleave"
exit 1
# Attempt to run a command, ensure it works.
elif ! numactl --interleave=all true
then
log_error "numactl failed, check if numactl is properly installed"
fi
# Launch mysqld with numactl.
[ $dry_run -eq 0 ] && cmd="$cmd numactl --interleave=all"
elif test $numa_interleave -eq 1
then
log_error "--numa-interleave is not supported on this platform"
exit 1
fi
for i in "$ledir/$MYSQLD" "$defaults_group_suffix" "$defaults" "--basedir=$MY_BASEDIR_VERSION" \
"--datadir=$DATADIR" "--plugin-dir=$plugin_dir" "$USER_OPTION"
do
cmd="$cmd "`shell_quote_string "$i"`
done
cmd="$cmd $args"
if [ $dry_run -eq 1 ]
then
# RETURN or EXIT depending if the script is being sourced or not.
(return 2> /dev/null) && return || exit
fi
# Avoid 'nohup: ignoring input' warning
test -n "$NOHUP_NICENESS" && cmd="$cmd < /dev/null"
log_notice "Starting $MYSQLD daemon with databases from $DATADIR"
# variable to track the current number of "fast" (a.k.a. subsecond) restarts
fast_restart=0
# maximum number of restarts before trottling kicks in
max_fast_restarts=5
# flag whether a usable sleep command exists
have_sleep=1
# close stdout and stderr, everything goes to $logging now
if expr "${-}" : '.*x' > /dev/null
then
:
else
exec 1>/dev/null
exec 2>/dev/null
fi
# maximum number of wsrep restarts
max_wsrep_restarts=0
while true
do
rm -f "$pid_file" # Some extra safety
start_time=`date +%M%S`
# Perform wsrep position recovery if wsrep_on=1, skip otherwise.
if test $wsrep_on -eq 1
then
# this sets wsrep_start_position_opt
wsrep_recover_position "$cmd"
[ $? -ne 0 ] && exit 1 #
[ -n "$wsrep_urls" ] && url=`wsrep_pick_url $wsrep_urls` # check connect address
if [ -z "$url" ]
then
eval_log_error "$cmd $wsrep_start_position_opt"
else
eval_log_error "$cmd $wsrep_start_position_opt --wsrep_cluster_address=$url"
fi
else
eval_log_error "$cmd"
fi
end_time=`date +%M%S`
if test ! -f "$pid_file" # This is removed if normal shutdown
then
break
fi
# sanity check if time reading is sane and there's sleep
if test $end_time -gt 0 -a $have_sleep -gt 0
then
# throttle down the fast restarts
if test $end_time -eq $start_time
then
fast_restart=`expr $fast_restart + 1`
if test $fast_restart -ge $max_fast_restarts
then
log_notice "The server is respawning too fast. Sleeping for 1 second."
sleep 1
sleep_state=$?
if test $sleep_state -gt 0
then
log_notice "The server is respawning too fast and no working sleep command. Turning off trottling."
have_sleep=0
fi
fast_restart=0
fi
else
fast_restart=0
fi
fi
if true && 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 $I + 1`
done
fi
if [ -n "$wsrep_restart" ]
then
if [ $wsrep_restart -le $max_wsrep_restarts ]
then
wsrep_restart=`expr $wsrep_restart + 1`
log_notice "WSREP: sleeping 15 seconds before restart"
sleep 15
else
log_notice "WSREP: not restarting wsrep node automatically"
break
fi
fi
log_notice "mysqld restarted"
if test -n "$crash_script"
then
crash_script_output=`$crash_script 2>&1`
log_error "$crash_script_output"
fi
done
log_notice "mysqld from pid file $pid_file ended"