resource-agents 1:3.9.2-5ubuntu4 / usr / lib / ocf / resource.d / heartbeat / mysql

#!/bin/sh
#
#
# MySQL
#
# Description:	Manages a MySQL database as Linux-HA resource
#
# Authors:	Alan Robertson:               DB2 Script
#		Jakub Janczak:                rewrite as MySQL
#		Andrew Beekhof:               cleanup and import
#		Sebastian Reitenbach:         add OpenBSD defaults, more cleanup
#		Narayan Newton:               add Gentoo/Debian defaults
#		Marian Marinov, Florian Haas: add replication capability
#
# Support:	linux-ha@lists.linux-ha.org
# License:	GNU General Public License (GPL)
#
# (c) 2002-2005 International Business Machines, Inc.
#     2005-2010 Linux-HA contributors
#
# An example usage in /etc/ha.d/haresources:
#       node1  10.0.0.170 mysql
#
# See usage() function below for more details...
#
# OCF instance parameters:
#   OCF_RESKEY_binary
#   OCF_RESKEY_client_binary
#   OCF_RESKEY_config
#   OCF_RESKEY_datadir
#   OCF_RESKEY_user
#   OCF_RESKEY_group
#   OCF_RESKEY_test_table
#   OCF_RESKEY_test_user
#   OCF_RESKEY_test_passwd
#   OCF_RESKEY_enable_creation
#   OCF_RESKEY_additional_parameters
#   OCF_RESKEY_log
#   OCF_RESKEY_pid
#   OCF_RESKEY_socket
#######################################################################
# Initialization:

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

#######################################################################

# Fill in some defaults if no values are specified
HOSTOS=`uname`
if [ "X${HOSTOS}" = "XOpenBSD" ];then
OCF_RESKEY_binary_default="/usr/local/bin/mysqld_safe"
OCF_RESKEY_config_default="/etc/my.cnf"
OCF_RESKEY_datadir_default="/var/mysql"
OCF_RESKEY_user_default="_mysql"
OCF_RESKEY_group_default="_mysql"
OCF_RESKEY_log_default="/var/log/mysqld.log"
OCF_RESKEY_pid_default="/var/mysql/mysqld.pid"
OCF_RESKEY_socket_default="/var/run/mysql/mysql.sock"
else
OCF_RESKEY_binary_default="/usr/bin/mysqld_safe"
OCF_RESKEY_config_default="/etc/mysql/my.cnf"
OCF_RESKEY_datadir_default="/var/lib/mysql"
OCF_RESKEY_user_default="mysql"
OCF_RESKEY_group_default="mysql"
OCF_RESKEY_log_default="/var/log/mysql.log"
OCF_RESKEY_pid_default="/var/run/mysqld/mysqld.pid"
OCF_RESKEY_socket_default="/var/lib/mysqld/mysqld.sock"
fi
OCF_RESKEY_client_binary_default="mysql"
OCF_RESKEY_test_user_default="root"
OCF_RESKEY_test_table_default="mysql.user"
OCF_RESKEY_test_passwd_default=""
OCF_RESKEY_enable_creation_default=0
OCF_RESKEY_additional_parameters_default=""
OCF_RESKEY_replication_port_default="3306"
OCF_RESKEY_max_slave_lag_default="3600"
OCF_RESKEY_evict_outdated_slaves_default="false"

: ${OCF_RESKEY_binary=${OCF_RESKEY_binary_default}}
MYSQL_BINDIR=`dirname ${OCF_RESKEY_binary}`

: ${OCF_RESKEY_client_binary=${OCF_RESKEY_client_binary_default}}

: ${OCF_RESKEY_config=${OCF_RESKEY_config_default}}
: ${OCF_RESKEY_datadir=${OCF_RESKEY_datadir_default}}

: ${OCF_RESKEY_user=${OCF_RESKEY_user_default}}
: ${OCF_RESKEY_group=${OCF_RESKEY_group_default}}

: ${OCF_RESKEY_log=${OCF_RESKEY_log_default}}
: ${OCF_RESKEY_pid=${OCF_RESKEY_pid_default}}
: ${OCF_RESKEY_socket=${OCF_RESKEY_socket_default}}

: ${OCF_RESKEY_test_user=${OCF_RESKEY_test_user_default}}
: ${OCF_RESKEY_test_table=${OCF_RESKEY_test_table_default}}
: ${OCF_RESKEY_test_passwd=${OCF_RESKEY_test_passwd_default}}

: ${OCF_RESKEY_enable_creation=${OCF_RESKEY_enable_creation_default}}
: ${OCF_RESKEY_additional_parameters=${OCF_RESKEY_additional_parameters_default}}

: ${OCF_RESKEY_replication_user=${OCF_RESKEY_replication_user_default}}
: ${OCF_RESKEY_replication_passwd=${OCF_RESKEY_replication_passwd_default}}
: ${OCF_RESKEY_replication_port=${OCF_RESKEY_replication_port_default}}

: ${OCF_RESKEY_max_slave_lag=${OCF_RESKEY_max_slave_lag_default}}
: ${OCF_RESKEY_evict_outdated_slaves=${OCF_RESKEY_evict_outdated_slaves_default}}

#######################################################################

usage() {
  cat <<UEND
	usage: $0 (start|stop|validate-all|meta-data|monitor|promote|demote|notify)

	$0 manages a MySQL Database as an HA resource.

	The 'start' operation starts the database.
	The 'stop' operation stops the database.
	The 'status' operation reports whether the database is running
	The 'monitor' operation reports whether the database seems to be working
	The 'promote' operation makes this mysql server run as master
	The 'demote' operation makes this mysql server run as slave
	The 'validate-all' operation reports whether the parameters are valid

UEND
}

meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="mysql">
<version>1.0</version>

<longdesc lang="en">
Resource script for MySQL. 
May manage a standalone MySQL database, a clone set with externally
managed replication, or a complete master/slave replication setup.
</longdesc>
<shortdesc lang="en">Manages a MySQL database instance</shortdesc>
<parameters>

<parameter name="binary" unique="0" required="0">
<longdesc lang="en">
Location of the MySQL server binary
</longdesc>
<shortdesc lang="en">MySQL server binary</shortdesc>
<content type="string" default="${OCF_RESKEY_binary_default}" />
</parameter>

<parameter name="client_binary" unique="0" required="0">
<longdesc lang="en">
Location of the MySQL client binary
</longdesc>
<shortdesc lang="en">MySQL client binary</shortdesc>
<content type="string" default="${OCF_RESKEY_client_binary_default}" />
</parameter>

<parameter name="config" unique="0" required="0">
<longdesc lang="en">
Configuration file
</longdesc>
<shortdesc lang="en">MySQL config</shortdesc>
<content type="string" default="${OCF_RESKEY_config_default}" />
</parameter>

<parameter name="datadir" unique="0" required="0">
<longdesc lang="en">
Directory containing databases
</longdesc>
<shortdesc lang="en">MySQL datadir</shortdesc>
<content type="string" default="${OCF_RESKEY_datadir_default}" />
</parameter>

<parameter name="user" unique="0" required="0">
<longdesc lang="en">
User running MySQL daemon
</longdesc>
<shortdesc lang="en">MySQL user</shortdesc>
<content type="string" default="${OCF_RESKEY_user_default}" />
</parameter>

<parameter name="group" unique="0" required="0">
<longdesc lang="en">
Group running MySQL daemon (for logfile and directory permissions)
</longdesc>
<shortdesc lang="en">MySQL group</shortdesc>
<content type="string" default="${OCF_RESKEY_group_default}"/>
</parameter>

<parameter name="log" unique="0" required="0">
<longdesc lang="en">
The logfile to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL log file</shortdesc>
<content type="string" default="${OCF_RESKEY_log_default}"/>
</parameter>

<parameter name="pid" unique="0" required="0">
<longdesc lang="en">
The pidfile to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL pid file</shortdesc>
<content type="string" default="${OCF_RESKEY_pid_default}"/>
</parameter>

<parameter name="socket" unique="0" required="0">
<longdesc lang="en">
The socket to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL socket</shortdesc>
<content type="string" default="${OCF_RESKEY_socket_default}"/>
</parameter>

<parameter name="test_table" unique="0" required="0">
<longdesc lang="en">
Table to be tested in monitor statement (in database.table notation)
</longdesc>
<shortdesc lang="en">MySQL test table</shortdesc>
<content type="string" default="${OCF_RESKEY_test_table_default}" />
</parameter>

<parameter name="test_user" unique="0" required="0">
<longdesc lang="en">
MySQL test user
</longdesc>
<shortdesc lang="en">MySQL test user</shortdesc>
<content type="string" default="${OCF_RESKEY_test_user_default}" />
</parameter>

<parameter name="test_passwd" unique="0" required="0">
<longdesc lang="en">
MySQL test user password
</longdesc>
<shortdesc lang="en">MySQL test user password</shortdesc>
<content type="string" default="${OCF_RESKEY_test_passwd_default}" />
</parameter>

<parameter name="enable_creation" unique="0" required="0">
<longdesc lang="en">
If the MySQL database does not exist, it will be created
</longdesc>
<shortdesc lang="en">Create the database if it does not exist</shortdesc>
<content type="integer" default="${OCF_RESKEY_enable_creation_default}"/>
</parameter>

<parameter name="additional_parameters" unique="0" required="0">
<longdesc lang="en">
Additional parameters which are passed to the mysqld on startup.
(e.g. --skip-external-locking or --skip-grant-tables)
</longdesc>
<shortdesc lang="en">Additional parameters to pass to mysqld</shortdesc>
<content type="string" default="${OCF_RESKEY_additional_parameters_default}"/>
</parameter>

<parameter name="replication_user" unique="0" required="0">
<longdesc lang="en">
MySQL replication user. This user is used for starting and stopping
MySQL replication, for setting and resetting the master host, and for
setting and unsetting read-only mode. Because of that, this user must
have SUPER, REPLICATION SLAVE, REPLICATION CLIENT, and PROCESS
privileges on all nodes within the cluster.
</longdesc>
<shortdesc lang="en">MySQL replication user</shortdesc>
<content type="string" default="${OCF_RESKEY_replication_user_default}" />
</parameter>

<parameter name="replication_passwd" unique="0" required="0">
<longdesc lang="en">
MySQL replication password. Used for replication client and slave.
</longdesc>
<shortdesc lang="en">MySQL replication user password</shortdesc>
<content type="string" default="${OCF_RESKEY_replication_passwd_default}" />
</parameter>

<parameter name="replication_port" unique="0" required="0">
<longdesc lang="en">
The port on which the Master MySQL instance is listening.
</longdesc>
<shortdesc lang="en">MySQL replication port</shortdesc>
<content type="string" default="${OCF_RESKEY_replication_port_default}" />
</parameter>

<parameter name="max_slave_lag" unique="0" required="0">
<longdesc lang="en">
The maximum number of seconds a replication slave is allowed to lag
behind its master. Do not set this to zero. What the cluster manager
does in case a slave exceeds this maximum lag is determined by the
evict_outdated_slaves parameter.
</longdesc>
<shortdesc lang="en">Maximum time (seconds) a MySQL slave is allowed
to lag behind a master</shortdesc>
<content type="integer" default="${OCF_RESKEY_max_slave_lag_default}"/>
</parameter>

<parameter name="evict_outdated_slaves" unique="0" required="0">
<longdesc lang="en">
If set to true, any slave which is more than max_slave_lag seconds
behind the master has its MySQL instance shut down. If this parameter
is set to false in a primitive or clone resource, it is simply
ignored. If set to false in a master/slave resource, then exceeding
the maximum slave lag will merely push down the master preference so
the lagging slave is never promoted to the new master.
</longdesc>
<shortdesc lang="en">Determines whether to shut down badly lagging
slaves</shortdesc>
<content type="boolean" default="${OCF_RESKEY_evict_outdated_slaves_default}" />
</parameter>

</parameters>

<actions>
<action name="start" timeout="120" />
<action name="stop" timeout="120" />
<action name="status" timeout="60" />
<action name="monitor" depth="0" timeout="30" interval="20" />
<action name="monitor" role="Master" depth="0" timeout="30" interval="10" />
<action name="monitor" role="Slave" depth="0" timeout="30" interval="30" />
<action name="promote" timeout="120" />
<action name="demote" timeout="120" />
<action name="notify" timeout="90" />
<action name="validate-all" timeout="5" />
<action name="meta-data" timeout="5" />
</actions>
</resource-agent>
END
}
#######################################################################
# Convenience variables

MYSQL=$OCF_RESKEY_client_binary
MYSQL_OPTIONS_LOCAL="-S $OCF_RESKEY_socket --connect_timeout=10"
MYSQL_OPTIONS_REPL="--user=$OCF_RESKEY_replication_user --password=$OCF_RESKEY_replication_passwd"

CRM_MASTER="${HA_SBIN_DIR}/crm_master -l reboot "
HOSTNAME=`uname -n`
CRM_ATTR="${HA_SBIN_DIR}/crm_attribute -N $HOSTNAME -l forever"
INSTANCE_ATTR_NAME=`echo ${OCF_RESOURCE_INSTANCE}| awk -F : '{print $1}'`

#######################################################################

# Convenience functions

set_read_only() {
    # Sets or unsets read-only mode. Accepts one boolean as its
    # optional argument. If invoked without any arguments, defaults to
    # enabling read only mode. Should only be set in master/slave
    # setups.
    # Returns $OCF_SUCCESS if the operation succeeds, or
    # $OCF_ERR_GENERIC if it fails.
    local ro_val
    if ocf_is_true $1; then
	ro_val="on"
    else
	ro_val="off"
    fi
    local mysql_options
    mysql_options="$MYSQL_OPTIONS_LOCAL"
    if [ -n $OCF_RESKEY_replication_user ]; then
	mysql_options="$mysql_options $MYSQL_OPTIONS_REPL"
    fi
    ocf_run $MYSQL $mysql_options \
	-e "SET GLOBAL read_only=${ro_val}"
}

get_read_only() {
    # Check if read-only is set
    local mysql_options
    local read_only_state

    mysql_options="$MYSQL_OPTIONS_LOCAL"
    if [ -n $OCF_RESKEY_replication_user ]; then
	mysql_options="$mysql_options $MYSQL_OPTIONS_REPL"
    fi

    read_only_state=`$MYSQL $mysql_options \
	-e "SHOW VARIABLES" | grep read_only | awk '{print $2}'`
    
    if [ "$read_only_state" = "ON" ]; then
	return 0
    else
	return 1
    fi
}

is_slave() {
    # Determine whether the machine is currently running as a MySQL
    # slave, as determined per SHOW SLAVE STATUS. Returns 1 if SHOW
    # SLAVE STATUS creates an empty result set, 0 otherwise.
    local rc
    local tmpfile
    local mysql_options

    # Check whether this machine should be slave
    if ! ocf_is_ms || ! get_read_only; then
        return 1;
    fi

    tmpfile=`mktemp ${HA_RSCTMP}/is_slave.${OCF_RESOURCE_INSTANCE}.XXXXXX`

    mysql_options="$MYSQL_OPTIONS_LOCAL $MYSQL_OPTIONS_REPL"

    $MYSQL $mysql_options \
        -e 'SHOW SLAVE STATUS\G' > $tmpfile

    # "SHOW SLAVE STATUS" returns an empty set if instance is not a
    # replication slave
    if [ -s $tmpfile ]; then
	rm -f $tmpfile
	return 0
    fi

    rm -f $tmpfile
    return 1
}

parse_slave_info() {
    # Extracts field $1 from result of "SHOW SLAVE STATUS\G" from file $2
    sed -ne "s/^.* $1: \(.*\)$/\1/p" < $2
}

get_slave_info() {
    # Warning: this sets $tmpfile and LEAVE this file! You must delete it after use!
    local mysql_options

    tmpfile=`mktemp ${HA_RSCTMP}/check_slave.${OCF_RESOURCE_INSTANCE}.XXXXXX`

    mysql_options="$MYSQL_OPTIONS_LOCAL $MYSQL_OPTIONS_REPL"

    $MYSQL $mysql_options \
        -e 'SHOW SLAVE STATUS\G' > $tmpfile

    if [ -s $tmpfile ]; then
	master_host=`parse_slave_info Master_Host $tmpfile`
	master_user=`parse_slave_info Master_User $tmpfile`
	master_port=`parse_slave_info Master_Port $tmpfile`
	master_log_file=`parse_slave_info Master_Log_File $tmpfile`
	master_log_pos=`parse_slave_info Read_Master_Log_Pos $tmpfile`
	slave_sql=`parse_slave_info Slave_SQL_Running $tmpfile`
	slave_io=`parse_slave_info Slave_IO_Running $tmpfile`
	last_errno=`parse_slave_info Last_Errno $tmpfile`
	secs_behind=`parse_slave_info Seconds_Behind_Master $tmpfile`

        ocf_log debug "MySQL instance running as a replication slave"
    else
        # Instance produced an empty "SHOW SLAVE STATUS" output --
        # instance is not a slave
	ocf_log err "check_slave invoked on an instance that is not a replication slave."
	return $OCF_ERR_GENERIC
    fi

    return $OCF_SUCCESS
}

check_slave() {
    # Checks slave status
    local rc

    get_slave_info
    rc=$?

    if [ $rc -eq 0 ]; then
	if [ $last_errno -ne 0 ]; then
	    # Whoa. Replication ran into an error. This slave has
	    # diverged from its master. Make sure this resource
	    # doesn't restart in place.
	    ocf_log err "MySQL instance configured for replication, but replication has failed."
	    ocf_log err "See $tmpfile for details"
	    exit $OCF_ERR_INSTALLED
	fi

	if [ "$slave_io" != 'Yes' ]; then
	    # Not necessarily a bad thing. The master may have
	    # temporarily shut down, and the slave may just be
	    # reconnecting. A warning can't hurt, though.
	    ocf_log warn "MySQL Slave IO threads currently not running."
	fi

	if [ "$slave_sql" != 'Yes' ]; then
	    # We don't have a replication SQL thread running. Not a
	    # good thing. Try to recoved by restarting the resource in
	    # place.
	    ocf_log err "MySQL Slave SQL threads currently not running."
	    ocf_log err "See $tmpfile for details"
	    exit $OCF_ERR_GENERIC
	fi

	if ocf_is_true $OCF_RESKEY_evict_outdated_slaves; then
	    # We're supposed to bail out if we lag too far
	    # behind. Let's check our lag.
	    if [ $secs_behind -gt $OCF_RESKEY_max_slave_lag ]; then
		ocf_log err "MySQL Slave is $secs_behind seconds behind master (allowed maximum: $OCF_RESKEY_max_slave_lag)."
		ocf_log err "See $tmpfile for details"
		exit $OCF_ERR_INSTALLED
	    fi
	elif ocf_is_ms; then
	    # Even if we're not set to evict lagging slaves, we can
	    # still use the seconds behind master value to set our
	    # master preference.
	    local master_pref
	    master_pref=$((${OCF_RESKEY_max_slave_lag}-${secs_behind}))
	    if [ $master_pref -lt 0 ]; then
		# Sanitize a below-zero preference to just zero
		master_pref=0
	    fi
	    $CRM_MASTER -v $master_pref
	fi

	ocf_log debug "MySQL instance running as a replication slave"
	rm -f $tmpfile
    else
        # Instance produced an empty "SHOW SLAVE STATUS" output --
        # instance is not a slave
	rm -f $tmpfile
	ocf_log err "check_slave invoked on an instance that is not a replication slave."
	exit $OCF_ERR_GENERIC
    fi
}

set_master() {
    local new_master_host master_log_file master_log_pos
    local master_params

    new_master_host=$1

    # Keep replication position
    get_slave_info

    if [ "$master_log_file" -a "$new_master_host" = "$master_host" ]; then
#	master_params=", MASTER_LOG_FILE='$master_log_file', \
#	    MASTER_LOG_POS=$master_log_pos"
	ocf_log info "Kept master pos for $master_host : $master_log_file:$master_log_pos"
	rm -f $tmpfile
	return
    else
	master_log_file=`$CRM_ATTR -n $new_master_host-log-file-${INSTANCE_ATTR_NAME} -q -G`
	master_log_pos=`$CRM_ATTR -n $new_master_host-log-pos-${INSTANCE_ATTR_NAME} -q -G`
	if [ -n "$master_log_file" -a -n "$master_log_pos" ]; then
	    master_params=", MASTER_LOG_FILE='$master_log_file', \
		MASTER_LOG_POS=$master_log_pos"
	    ocf_log info "Restored master pos for $new_master_host : $master_log_file:$master_log_pos"
	fi
    fi

    # Informs the MySQL server of the master to replicate
    # from. Accepts one mandatory argument which must contain the host
    # name of the new master host. The master must either be unchanged
    # from the laste master the slave replicated from, or freshly
    # reset with RESET MASTER.

    ocf_run $MYSQL $MYSQL_OPTIONS_LOCAL $MYSQL_OPTIONS_REPL \
	-e "CHANGE MASTER TO MASTER_HOST='$new_master_host', \
                             MASTER_USER='$OCF_RESKEY_replication_user', \
                             MASTER_PASSWORD='$OCF_RESKEY_replication_passwd' $master_params"

    rm -f $tmpfile
}

unset_master(){
    # Instructs the MySQL server to stop replicating from a master
    # host.

    # If we're currently not configured to be replicating from any
    # host, then there's nothing to do. But we do log a warning as
    # no-one but the CRM should be touching the MySQL master/slave
    # configuration.
    if ! is_slave; then
	ocf_log warn "Attempted to unset the replication master on an instance that is not configured as a replication slave"
	return $OCF_SUCCESS
    fi

    local mysql_options
    mysql_options="$MYSQL_OPTIONS_LOCAL $MYSQL_OPTIONS_REPL"

    local tmpfile
    tmpfile=`mktemp ${HA_RSCTMP}/unset_master.${OCF_RESOURCE_INSTANCE}.XXXXXX`

    # First, stop the slave I/O thread and wait for relay log
    # processing to complete
    ocf_run $MYSQL $mysql_options \
	-e "STOP SLAVE IO_THREAD"
    if [ $? -gt 0 ]; then
	ocf_log err "Error stopping slave IO thread"
	exit $OCF_ERR_GENERIC
    fi

    while true; do
     	$MYSQL $mysql_options \
     	    -e 'SHOW PROCESSLIST\G' > $tmpfile
     	if grep 'Has read all relay log' $tmpfile >/dev/null; then
	    ocf_log info "MySQL slave has finished processing relay log"
	    break
	fi
	if ! grep -q 'system user' $tmpfile; then
	    ocf_log info "Slave not runnig - not waiting to finish"
	    break
	fi
     	ocf_log info "Waiting for MySQL slave to finish processing relay log"
     	sleep 1
     done
    rm -f $tmpfile

    # Now, stop all slave activity and unset the master host
    ocf_run $MYSQL $mysql_options \
	-e "STOP SLAVE"
    if [ $? -gt 0 ]; then
	ocf_log err "Error stopping rest slave threads"
	exit $OCF_ERR_GENERIC
    fi

    #Save current state
    get_slave_info
    $CRM_ATTR -n $master_host-log-file-${INSTANCE_ATTR_NAME} -v $master_log_file
    $CRM_ATTR -n $master_host-log-pos-${INSTANCE_ATTR_NAME} -v $master_log_pos
    rm -f $tmpfile

    ocf_run $MYSQL $mysql_options \
	-e "CHANGE MASTER TO MASTER_HOST=''" 
    if [ $? -gt 0 ]; then
	    ocf_log err "Failed to set master"
	    exit $OCF_ERR_GENERIC
    fi
}

# Start replication as slave. Master hostname as parameter
start_slave() {
    local master_host
    
    master_host="$1"

    # Remove state attributes - it will be invalid after START SLAVE
    $CRM_ATTR -n $master_host-log-file-${INSTANCE_ATTR_NAME} -D
    $CRM_ATTR -n $master_host-log-pos-${INSTANCE_ATTR_NAME} -D

    ocf_run $MYSQL $MYSQL_OPTIONS_LOCAL $MYSQL_OPTIONS_REPL \
	    -e "START SLAVE"
}

#######################################################################

# Functions invoked by resource manager actions

mysql_validate() {
    check_binary $OCF_RESKEY_binary
    check_binary  $OCF_RESKEY_client_binary

    if [ ! -f $OCF_RESKEY_config ]; then
	ocf_log err "Config $OCF_RESKEY_config doesn't exist";
	return $OCF_ERR_CONFIGURED;
    fi

    if [ ! -d $OCF_RESKEY_datadir ]; then
	ocf_log err "Datadir $OCF_RESKEY_datadir doesn't exist";
	return $OCF_ERR_CONFIGURED;
    fi

    getent passwd $OCF_RESKEY_user >/dev/null 2>&1
    if [ ! $? -eq 0 ]; then
	ocf_log err "User $OCF_RESKEY_user doesn't exit";
	return $OCF_ERR_INSTALLED;
    fi

    getent group $OCF_RESKEY_group >/dev/null 2>&1
    if [ ! $? -eq 0 ]; then
	ocf_log err "Group $OCF_RESKEY_group doesn't exist";
	return $OCF_ERR_INSTALLED;
    fi

    true
}

mysql_status() {
	if [ ! -e $OCF_RESKEY_pid ]; then
		ocf_log err "MySQL is not running"
		return $OCF_NOT_RUNNING;
	fi

	pid=`cat $OCF_RESKEY_pid`;
	if [ -d /proc -a -d /proc/1 ]; then
		[ "u$pid" != "u" -a -d /proc/$pid ]
	else
		kill -s 0 $pid >/dev/null 2>&1
	fi

	if [ $? -eq 0 ]; then
	    return $OCF_SUCCESS;
	else
	    ocf_log err "MySQL not running: removing old PID file"
	    rm -f $OCF_RESKEY_pid
	    return $OCF_NOT_RUNNING;
	fi
}

mysql_monitor() {
    local rc
    mysql_status
    rc=$?

    # If status returned an error, return that immediately
    if [ $rc -ne $OCF_SUCCESS ]; then
	return $rc
    fi


    if [ $OCF_CHECK_LEVEL -gt 0 -a -n "$OCF_RESKEY_test_table" ]; then
	# Check if this instance is configured as a slave, and if so
	# check slave status
	if is_slave; then
	    check_slave
	fi

	local mysql_options
	mysql_options="$MYSQL_OPTIONS_LOCAL --user=$OCF_RESKEY_test_user --password=$OCF_RESKEY_test_passwd"

        # Check for test table
	ocf_run $MYSQL $mysql_options \
	    -e "SELECT COUNT(*) FROM $OCF_RESKEY_test_table"
	rc=$?

	if [ $rc -ne 0 ]; then
	    ocf_log err "Failed to select from $test_table";
	    return $OCF_ERR_GENERIC;
	fi
    fi

    if ocf_is_ms && ! get_read_only; then
	    ocf_log info "MySQL monitor succeeded (master)";
	    return $OCF_RUNNING_MASTER
    else
	    ocf_log info "MySQL monitor succeeded";
	    return $OCF_SUCCESS
    fi
}

mysql_start() {
    mysql_status
    if [ $? = $OCF_SUCCESS ]; then
	ocf_log info "MySQL already running"
	return $OCF_SUCCESS
    fi

    touch $OCF_RESKEY_log
    chown $OCF_RESKEY_user:$OCF_RESKEY_group $OCF_RESKEY_log
    chmod 0640 $OCF_RESKEY_log
    [ -x /sbin/restorecon ] && /sbin/restorecon $OCF_RESKEY_log

    if ocf_is_true "$OCF_RESKEY_enable_creation" && [ ! -d $OCF_RESKEY_datadir/mysql ] ; then
        ocf_log info "Initializing MySQL database: "
	$MYSQL_BINDIR/mysql_install_db --datadir=$OCF_RESKEY_datadir
        rc=$?
        if [ $rc -ne 0 ] ; then
	    ocf_log err "Initialization failed: $rc";
            exit $OCF_ERR_GENERIC
        fi
        chown -R $OCF_RESKEY_user:$OCF_RESKEY_group $OCF_RESKEY_datadir
    fi

    pid_dir=`dirname $OCF_RESKEY_pid`
    if [ ! -d $pid_dir ] ; then
	ocf_log info "Creating PID dir: $pid_dir"
	mkdir -p $pid_dir
	chown $OCF_RESKEY_user:$OCF_RESKEY_group $pid_dir
    fi

    socket_dir=`dirname $OCF_RESKEY_socket`
    if [ ! -d $socket_dir ] ; then
	ocf_log info "Creating socket dir: $socket_dir"
	mkdir -p $socket_dir
	chown $OCF_RESKEY_user:$OCF_RESKEY_group $socket_dir
    fi

    # Regardless of whether we just created the directory or it
    # already existed, check whether it is writable by the configured
    # user
    for dir in $pid_dir $socket_dir; do
	if ! su -s /bin/sh - $OCF_RESKEY_user -c "test -w $dir"; then
	    ocf_log err "Directory $dir is not writable by $OCF_RESKEY_user"
	    exit $OCF_ERR_PERM;
	fi
    done

    # Uncomment to perform permission clensing
    # - not convinced this should be enabled by default
    #
    #chmod 0755 $OCF_RESKEY_datadir
    #chown -R $OCF_RESKEY_user $OCF_RESKEY_datadir
    #chgrp -R $OCF_RESKEY_group $OCF_RESKEY_datadir
    mysql_extra_params=
    if ocf_is_ms; then
        mysql_extra_params="--skip-slave-start"
    fi

    ${OCF_RESKEY_binary} --defaults-file=$OCF_RESKEY_config \
		--pid-file=$OCF_RESKEY_pid \
		--socket=$OCF_RESKEY_socket \
		--datadir=$OCF_RESKEY_datadir \
		--user=$OCF_RESKEY_user $OCF_RESKEY_additional_parameters \
        $mysql_extra_params >/dev/null 2>&1 &
    rc=$?

    if [ $rc != 0 ]; then
	ocf_log err "MySQL start command failed: $rc"
  	return $rc
    fi

    # Spin waiting for the server to come up.
    # Let the CRM/LRM time us out if required
    start_wait=1
    while [ $start_wait = 1 ]; do
	mysql_status
	rc=$?
	if [ $rc = $OCF_SUCCESS ]; then
	    start_wait=0

	elif [ $rc != $OCF_NOT_RUNNING ]; then
	    ocf_log info "MySQL start failed: $rc"
	    return $rc
	fi
        sleep 2
    done

    if ocf_is_ms; then
	# We're configured as a stateful resource. We must start as
	# slave by default. At this point we don't know if the CRM has
	# already promoted a master. So, we simply start in read only
	# mode.
	set_read_only on

	# Now, let's see whether there is a master. We might be a new
	# node that is just joining the cluster, and the CRM may have
	# promoted a master before.
	master_host=`echo $OCF_RESKEY_CRM_meta_notify_master_uname|tr -d " "`
	if [ "$master_host" -a "$master_host" != `uname -n` ]; then
	    ocf_log info "Changing MySQL configuration to replicate from $master_host."
	    set_master $master_host
	    ocf_run $MYSQL $MYSQL_OPTIONS_LOCAL $MYSQL_OPTIONS_REPL \
		-e 'START SLAVE'
	    if [ $? -ne 0 ]; then
		ocf_log err "Failed to start slave"
		return $OCF_ERR_GENERIC
	    fi
	else
	    ocf_log info "No MySQL master present, clearing replication state"
	    unset_master
	fi

	master_host=`echo $OCF_RESKEY_CRM_meta_notify_master_uname`
	if [ "$master_host" -a "$master_host" != `uname -n` ]; then
	    ocf_log info "Changing MySQL configuration to replicate from $master_host."
	    set_master $master_host
	    start_slave $master_host
	    if [ $? -ne 0 ]; then
		ocf_log err "Failed to start slave"
		return $OCF_ERR_GENERIC
	    fi
	else
	    ocf_log info "No MySQL master present - clearing replication state"
	    unset_master
	fi

	# We also need to set a master preference, otherwise Pacemaker
	# won't ever promote us in the absence of any explicit
	# preference set by the administrator. We choose a low
	# greater-than-zero preference.
	$CRM_MASTER -v 1
    fi

    # Initial monitor action
    if [ -n "$OCF_RESKEY_test_table" -a -n "$OCF_RESKEY_test_user" -a -n "$OCF_RESKEY_test_passwd" ]; then
        OCF_CHECK_LEVEL=10
    fi
    mysql_monitor
    rc=$?
    if [ $rc != $OCF_SUCCESS -a $rc != $OCF_RUNNING_MASTER ]; then
	ocf_log err "Failed initial monitor action"
	return $rc
    fi
    
    ocf_log info "MySQL started"
    return $OCF_SUCCESS
}

mysql_stop() {

    if ocf_is_ms; then
	# clear preference for becoming master
	$CRM_MASTER -D
    fi

    if [ ! -f $OCF_RESKEY_pid ]; then
	ocf_log info "MySQL is not running"
        return $OCF_SUCCESS
    fi

    pid=`cat $OCF_RESKEY_pid 2> /dev/null `
	/bin/kill $pid > /dev/null
    rc=$?
    if [ $rc != 0 ]; then
        ocf_log err "MySQL couldn't be stopped"
	return $OCF_ERR_GENERIC
    fi

	# stop waiting
    shutdown_timeout=15
    if [ -n "$OCF_RESKEY_CRM_meta_timeout" ]; then
	shutdown_timeout=$((($OCF_RESKEY_CRM_meta_timeout/1000)-5))
    fi
    count=0
    while [ $count -lt $shutdown_timeout ]
    do
	mysql_status
	rc=$?
	if [ $rc = $OCF_NOT_RUNNING ]; then
	    break
	fi
	count=`expr $count + 1`
	sleep 1
	ocf_log debug "MySQL still hasn't stopped yet. Waiting..."
    done

    mysql_status
    if [ $? != $OCF_NOT_RUNNING ]; then
	ocf_log info "MySQL failed to stop after ${shutdown_timeout}s using SIGTERM. Trying SIGKILL..."
	/bin/kill -KILL $pid > /dev/null
    fi

    ocf_log info "MySQL stopped";
    rm -f /var/lock/subsys/mysqld
    rm -f $OCF_RESKEY_socket
    return $OCF_SUCCESS
}

mysql_promote() {
    if ( ! mysql_status ); then
	return $OCF_NOT_RUNNING
    fi
    ocf_run $MYSQL $MYSQL_OPTIONS_LOCAL $MYSQL_OPTIONS_REPL \
	-e "STOP SLAVE"
    set_read_only off || return $OCF_ERR_GENERIC

    # Existing master gets a higher-than-default master preference, so
    # the cluster manager does not shuffle the master role around
    # unnecessarily
    $CRM_MASTER -v $((${OCF_RESKEY_max_slave_lag}+1))

    return $OCF_SUCCESS
}

mysql_demote() {
    if ! mysql_status; then
	return $OCF_NOT_RUNNING
    fi

    set_read_only on
    if [ $? -ne 0 ]; then
	ocf_log err "Failed to set read-only";
	return $OCF_ERR_GENERIC;
    fi

    # Return master preference to default, so the cluster manager gets
    # a chance to select a new master
    $CRM_MASTER -v 1
}

mysql_notify() {
    # If not configured as a Stateful resource, we make no sense of
    # notifications.
    if ! ocf_is_ms; then
	ocf_log info "This agent makes no use of notifications unless running in master/slave mode."
	return $OCF_SUCCESS
    fi

    local type_op
    type_op="${OCF_RESKEY_CRM_meta_notify_type}-${OCF_RESKEY_CRM_meta_notify_operation}"

    ocf_log debug "Received $type_op notification."

    case "$type_op" in
	'pre-promote')
	    # A new master is about to being promoted. It's not in
	    # read-write mode yet (that only occurs when it actually
	    # executes the promote action), so we can now safely
	    # connect to it and wait for it to start replicating.
	    local master_host
	    local master_status
	    master_host=`echo $OCF_RESKEY_CRM_meta_notify_promote_uname`

	    if ( ! mysql_status ); then
		return $OCF_NOT_RUNNING
	    fi
	    if [ -z "$master_host" ]; then
		ocf_log err "Unable to determine master host!"
		return $OCF_ERR_GENERIC
	    fi

	    if [ $master_host = `uname -n` ]; then
		ocf_log info "This will be new master"
	    else
		ocf_log info "Changing MySQL configuration to replicate from $master_host"
		set_master $master_host
		if [ $? -ne 0 ]; then
		    return $OCF_ERR_GENERIC
		else
		    return $OCF_SUCCESS
		fi
	    fi
	    ;;
	'post-promote')
	    # The master has completed its promotion. Now is a good
	    # time to check whether our replication slave is working
	    # correctly.
	    master_host=`echo $OCF_RESKEY_CRM_meta_notify_promote_uname`
	    if [ "$master_host" = `uname -n` ]; then
		ocf_log info "Ignoring post-promote notification for my own promotion."
		return $OCF_SUCCESS
	    fi
            start_slave $master_host
	    if [ $? -ne 0 ]; then
		ocf_log err "Failed to start slave"
		return $OCF_ERR_GENERIC
	    fi
	    ;;
	'post-demote')
	    demote_host=`echo $OCF_RESKEY_CRM_meta_notify_demote_uname`
	    if [ $demote_host = `uname -n` ]; then
		ocf_log info "Ignoring post-demote notification for my own demotion."
		return $OCF_SUCCESS
	    fi
	    ocf_log info "post-demote notification for $demote_host."
	    # The former master has just been gracefully demoted.
	    unset_master
	    ;;
	*)
	    return $OCF_SUCCESS
	    ;;
    esac
}

#######################################################################

case "$1" in
  meta-data)	meta_data
		exit $OCF_SUCCESS;;
  usage|help)	usage
		exit $OCF_SUCCESS;;
esac

mysql_validate
rc=$?
LSB_STATUS_STOPPED=3
if [ $rc -ne 0 ]; then
	case "$1" in
		stop) exit $OCF_SUCCESS;;
		monitor) exit $OCF_NOT_RUNNING;;
		status) exit $LSB_STATUS_STOPPED;;
		*) exit $rc;;
	esac
fi

# What kind of method was invoked?
case "$1" in
  start)	mysql_start;;
  stop)		mysql_stop;;
  status)	mysql_status;;
  monitor)	mysql_monitor;;
  promote)	mysql_promote;;
  demote)	mysql_demote;;
  notify)	mysql_notify;;
  validate-all)	exit $OCF_SUCCESS;;

 *)		usage
		exit $OCF_ERR_UNIMPLEMENTED;;
esac