lizardfs-cluster

#!/bin/sh

### BEGIN INIT INFO
# Provides:             lizardfs-cluster
# Required-Start:       $network $remote_fs
# Required-Stop:        $remote_fs
# Default-Start:        2 3 4 5
# Default-Stop:         0 1 6
# Short-Description:    Check and change status of LizardFS cluster
# Description:          lizardfs-cluster provides cluster management for LizardFS.
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
NAME=lfscluster
DESC=lizardfs-cluster
DEFAULT_WORKING_USER=lizardfs
DEFAULT_WORKING_GROUP=lizardfs
DEFAULT_DATA_PATH=/var/lib/lizardfs
DEFAULT_RUN_PATH=/var/run
DEFAULT_CFG=/etc/lizardfs/mfsmaster.cfg
COMPAT_CFG=/etc/mfsmaster.cfg
HOSTNAME="$(cat /etc/hostname)"

test -e $DAEMON || exit 0

# Include lizardfs-master defaults if available
. /lib/lsb/init-functions
LIZARDFSMASTER_ENABLE=false
LIZARDFSMASTER_CONFIG_FILE=
LIZARDFSMASTER_DEFAULTS_FILE=/etc/default/lizardfs-master
if [ -s "$LIZARDFSMASTER_DEFAULTS_FILE" ]; then
    . "$LIZARDFSMASTER_DEFAULTS_FILE"
    case "x$LIZARDFSMASTER_ENABLE" in
        xtrue) ;;
        xfalse)
            log_warning_msg "lizardfs-master not enabled in \"$LIZARDFSMASTER_DEFAULTS_FILE\", exiting..."
            exit 0
            ;;
        *)
            log_failure_msg "value of LIZARDFSMASTER_ENABLE must be either 'true' or 'false';"
            log_failure_msg "not starting lizardfs-master."
            exit 1
            ;;
    esac
fi

set -e

if [ -n "$LIZARDFSMASTER_CONFIG_FILE" ]; then
        CFGFILE="$LIZARDFSMASTER_CONFIG_FILE"
elif [ -f "$DEFAULT_CFG" -o ! -f "$COMPAT_CFG" ]; then
        CFGFILE="$DEFAULT_CFG"
else
        CFGFILE="$COMPAT_CFG"
fi

get_config_value_from_CFGFILE()
{
                echo $(sed -e 's/[[:blank:]]*#.*$//' -n -e 's/^[[:blank:]]*'$1'[[:blank:]]*=[[:blank:]]*\(.*\)$/\1/p' $CFGFILE)
}

if [ -s "$CFGFILE" ]; then
        DATA_PATH=$(get_config_value_from_CFGFILE "DATA_PATH")
        RUN_PATH=$(get_config_value_from_CFGFILE "RUN_PATH")
        WORKING_USER=$(get_config_value_from_CFGFILE "WORKING_USER")
        WORKING_GROUP=$(get_config_value_from_CFGFILE "WORKING_GROUP")
fi

: ${DATA_PATH:=$DEFAULT_DATA_PATH}
: ${RUN_PATH:=$DEFAULT_RUN_PATH}
: ${WORKING_USER:=$DEFAULT_WORKING_USER}
: ${WORKING_GROUP:=$DEFAULT_WORKING_GROUP}

check_dirs()
{
        # check that the metadata dir exists
        if [ ! -d "$DATA_PATH" ]; then
                mkdir -p "$DATA_PATH"
        fi
        chmod 0755 "$DATA_PATH"
        chown -R $WORKING_USER:$WORKING_GROUP "$DATA_PATH"
        if [ ! -e "$DATA_PATH"/metadata.mfs ]; then
                if [ ! -e "$DATA_PATH"/metadata.mfs.back ]; then
                        echo "MFSM NEW" > "$DATA_PATH"/metadata.mfs
                fi
        fi

        if [ ! -d "$RUN_PATH" ]; then
                mkdir -p "$RUN_PATH"
        fi
        chmod 0755 "$RUN_PATH"
        chown -R $WORKING_USER:$WORKING_GROUP "$RUN_PATH"
}
check_status()
{
        # check current personality
        if grep -q "PERSONALITY = master" "/etc/lizardfs/mfsmaster.cfg"
        then
                LFS_PERSONALITY=master
                echo "Current personality is $LFS_PERSONALITY"
                exit 0;
        elif grep -q "PERSONALITY = shadow" "/etc/lizardfs/mfsmaster.cfg"
        then
                LFS_PERSONALITY=shadow
                echo "Current personality is $LFS_PERSONALITY"
                exit 1;
        fi
}

become_master()
{
        # Promote to master, making a backup of the config
        # sed -i.bak '1s/shadow/master/' $DEFAULT_CFG
	    cp /etc/lizardfs/mfsmaster.cfg /etc/lizardfs/mfsmaster.cfg.bak
	    cp /etc/lizardfs/mfsmaster.master.cfg /etc/lizardfs/mfsmaster.cfg

        # Flush file system buffers
        # sync

        # Restart the master service
        service lizardfs-master restart || echo FAIL

        # Force corosync to move the failover-ip to this host
        crm resource migrate failover-ip $HOSTNAME

        # Remove the constraint that corosync just created
        crm resource unmigrate failover-ip

        exit 0;
}
become_shadow()
{
        # Demote to shadow, making a backup of the config
        # sed -i.bak '1s/master/shadow/' $DEFAULT_CFG
        cp /etc/lizardfs/mfsmaster.cfg /etc/lizardfs/mfsmaster.cfg.bak
        cp /etc/lizardfs/mfsmaster.shadow.cfg /etc/lizardfs/mfsmaster.cfg

        # Flush file system buffers
        # sync

        # Restart the master service
        service lizardfs-master restart || echo FAIL

        exit 0;
}

case "$1" in
        start|master)
                check_dirs
                echo "Starting $DESC:"
                become_master
                ;;

        stop|slave|shadow)
                echo "Stopping $DESC:"
                become_shadow
                ;;

        reload|force-reload)
                echo "Option not supported. Nothing to reload."
                ;;

        restart)
                echo "Option not supported. Nothing to restart."
                ;;
        status)
                echo "Checking $DESC:"
                check_status
                ;;
        *)
                N=/etc/init.d/$NAME
                echo "Usage: $N {start|stop|status}" >&2
                exit 1
                ;;
esac

exit 0