yumでインストールしたMySQLを複数起動する

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yumでインストールしたMySQLを複数起動する起動スクリプトを書いたのでメモ。 CentOS 5.2, MySQL 5.0.45 で動作確認しました。 いろいろと細かく修正する必要があって、なんだかなー、といった感じです。 /etc/rc.d/init.d/mysqld-second とかそういう名前で作ってます。 ↓長いので本体は続きで。

/etc/rc.d/init.d/mysqld-second

#!/bin/bash
#
# mysqld-second        This shell script takes care of starting and stopping
#               the MySQL subsystem (mysqld).
#
# chkconfig: - 64 36
# description:  MySQL database server.
# processname: mysqld-second
# config: /etc/my_second.cnf
# pidfile: /var/run/mysqld/mysqld_second.pid
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
config="/etc/my_second.cnf"
prog="MySQL"
# extract value of a MySQL option from config files
# Usage: get_mysql_option SECTION VARNAME DEFAULT
# result is returned in $result
# We use my_print_defaults which prints all options from multiple files,
# with the more specific ones later; hence take the last match.
get_mysql_option(){
result=`/usr/bin/my_print_defaults -c "$config" "$1" | sed -n "s/^--$2=//p" | tail -n 1`
if [ -z "$result" ]; then
# not found, use default
result="$3"
fi
}
get_mysql_option mysqld datadir "/var/lib/mysql_second"
datadir="$result"
get_mysql_option mysqld socket "$datadir/mysql_second.sock"
socketfile="$result"
get_mysql_option mysqld_safe log-error "/var/log/mysqld_second.log"
errlogfile="$result"
get_mysql_option mysqld_safe pid-file "/var/run/mysqld/mysqld_second.pid"
mypidfile="$result"
start(){
touch "$errlogfile"
chown mysql:mysql "$errlogfile"
chmod 0640 "$errlogfile"
[ -x /sbin/restorecon ] && /sbin/restorecon "$errlogfile"
if [ ! -d "$datadir/mysql" ] ; then
action $"Initializing MySQL database: " /usr/bin/mysql_install_db --datadir="$datadir"
ret=$?
chown -R mysql:mysql "$datadir"
if [ $ret -ne 0 ] ; then
return $ret
fi
fi
chown mysql:mysql "$datadir"
chmod 0755 "$datadir"
# Pass all the options determined above, to ensure consistent behavior.
# In many cases mysqld_safe would arrive at the same conclusions anyway
# but we need to be sure.
/usr/bin/mysqld_safe --defaults-file="$config" --datadir="$datadir" --socket="$socketfile" \
--log-error="$errlogfile" --pid-file="$mypidfile" \
>/dev/null 2>&1 &
ret=$?
# Spin for a maximum of N seconds waiting for the server to come up.
# Rather than assuming we know a valid username, accept an "access
# denied" response as meaning the server is functioning.
if [ $ret -eq 0 ]; then
STARTTIMEOUT=30
while [ $STARTTIMEOUT -gt 0 ]; do
RESPONSE=`/usr/bin/mysqladmin -uUNKNOWN_MYSQL_USER --socket="$socketfile" ping 2>&1` && break
echo "$RESPONSE" | grep -q "Access denied for user" && break
sleep 1
let STARTTIMEOUT=${STARTTIMEOUT}-1
done
if [ $STARTTIMEOUT -eq 0 ]; then
echo "Timeout error occurred trying to start MySQL Daemon."
action $"Starting $prog: " /bin/false
ret=1
else
action $"Starting $prog: " /bin/true
fi
else
action $"Starting $prog: " /bin/false
fi
[ $ret -eq 0 ] && touch /var/lock/subsys/mysqld_second
return $ret
}
stop(){
MYSQLPID=`cat "$mypidfile"  2>/dev/null `
if [ -n "$MYSQLPID" ]; then
/bin/kill "$MYSQLPID" >/dev/null 2>&1
ret=$?
if [ $ret -eq 0 ]; then
STOPTIMEOUT=60
while [ $STOPTIMEOUT -gt 0 ]; do
/bin/kill -0 "$MYSQLPID" >/dev/null 2>&1 || break
sleep 1
let STOPTIMEOUT=${STOPTIMEOUT}-1
done
if [ $STOPTIMEOUT -eq 0 ]; then
echo "Timeout error occurred trying to stop MySQL Daemon."
ret=1
action $"Stopping $prog: " /bin/false
else
rm -f /var/lock/subsys/mysqld_second
rm -f "$socketfile"
action $"Stopping $prog: " /bin/true
fi
else
action $"Stopping $prog: " /bin/false
fi
else
ret=1
action $"Stopping $prog: " /bin/false
fi
return $ret
}
restart(){
stop
start
}
condrestart(){
[ -e /var/lock/subsys/mysqld_second ] && restart || :
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status mysqld
;;
restart)
restart
;;
condrestart)
condrestart
;;
*)
echo $"Usage: $0 {start|stop|status|condrestart|restart}"
exit 1
esac
exit $?

/etc/my_second.cnf

[mysqld]
port=3307
datadir=/var/lib/mysql_second
socket=/var/lib/mysql_second/mysql_second.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
[mysqld_safe]
log-error=/var/log/mysqld_second.log
pid-file=/var/run/mysqld/mysqld_second.pid
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