Synnefo » snf-ganeti

#!/bin/bash

# ganeti master role OCF resource

# See http://linux-ha.org/wiki/OCF_Resource_Agents

set -e -u

@SHELL_ENV_INIT@

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin

SCRIPTNAME="@LIBDIR@/ocf/resource.d/ganeti/ganeti-master-role"

# Master candidates list file

MCFILE="$DATA_DIR/ssconf_master_candidates"

# We'll need the hostname in a few places, so we'll get it once, now.

MYHOSTNAME=$(hostname --fqdn)

is_master() {

  local -r master=$(gnt-cluster getmaster)

  [[ "$MYHOSTNAME" == "$master" ]]

}

is_candidate() {

  grep -Fx $MYHOSTNAME $MCFILE

}

start_action() {

  if is_master; then

    exit 0

  elif is_candidate; then

    gnt-cluster master-failover || exit 1 # OCF_ERR_GENERIC

  else

    exit 5 # OCF_ERR_INSTALLED (vital component missing)

  fi

}

stop_action() {

  # We can't really "stop" being a master.

  # TODO: investigate whether a fake approach will do.

  exit 1 # OCF_ERR_GENERIC

}

recover_action() {

  if is_master; then

    gnt-cluster redist-conf || exit 1 # OCF_ERR_GENERIC

  elif is_candidate; then

    gnt-cluster master-failover || exit 1 # OCF_ERR_GENERIC

  else

    exit 5 # OCF_ERR_INSTALLED (vital component missing)

  fi

}

monitor_action() {

  # monitor should exit:

  #    7 if the resource is not running

  #    1 if it failed

  #    0 if it's running

  if is_master; then

    exit 0

  elif is_candidate; then

    exit 7 # OCF_NOT_RUNNING

  else

    exit 5 # OCF_ERR_INSTALLED (vital component missing)

  fi

}

return_meta() {

cat <<END

<?xml version="1.0"?>

<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">

<resource-agent name="ganeti-master-role" version="0.1">

<version>0.1</version>

<longdesc lang="en">

OCF script to manage the ganeti master role in a cluster.

Can be used to failover the ganeti master between master candidate nodes.

</longdesc>

<shortdesc lang="en">Manages the ganeti cluster master</shortdesc>

<parameters/>

<actions>

<action name="start" timeout="300s" />

<action name="stop" timeout="50s" />

<action name="monitor" depth="0" timeout="10s" interval="30s" />

<action name="meta-data" timeout="5s" />

<action name="recover" timeout="20s" />

<action name="reload" timeout="5s" />

</actions>

</resource-agent>

END

exit 0

}

case "$1" in

  # Mandatory OCF commands

  start)

    start_action

    ;;

  stop)

    stop_action

    ;;

  monitor)

    monitor_action

    ;;

  meta-data)

    return_meta

    ;;

  # Optional OCF commands

  recover)

    recover_action

    ;;

  reload)

    # The ganeti master role has no "configuration" that is reloadable on

    # the pacemaker side. We declare the operation anyway to make sure

    # pacemaker doesn't decide to stop and start the service needlessly.

    exit 0

    ;;

  promote|demote|migrate_to|migrate_from|validate-all)

    # Not implemented (nor declared by meta-data)

    exit 3 # OCF_ERR_UNIMPLEMENTED

    ;;

  *)

    log_success_msg "Usage: $SCRIPTNAME {start|stop|monitor|meta-data|recover|reload}"

    exit 1

    ;;

esac

exit 0