Synnefo » snf-ganeti

#!/bin/bash

# ganeti node 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-node-role"

# If this file exists don't act on notifications, thus allowing them to happen

# during the service configuration.

NORUNFILE="$DATA_DIR/ha_node_role_config"

# Where to grep for tags

TAGSFILE="$DATA_DIR/ssconf_cluster_tags"

# If this tag is set we won't try to powercycle nodes

POWERCYCLETAG="ocf:node-offline:use-powercycle"

# If this tag is set will use IPMI to power off an offline node

POWEROFFTAG="ocf:node-offline:use-poweroff"

# 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" ]]

}

start_action() {

  # If we're alive we consider ourselves a node, without starting anything.

  # TODO: improve on this

  exit 0

}

stop_action() {

  # We can't "really" stop the service locally.

  # TODO: investigate whether a "fake" stop will work.

  exit 1

}

recover_action() {

  # Nothing to recover, as long as we're alive.

  exit 0

}

monitor_action() {

  # If we're alive we consider ourselves a working node.

  # TODO: improve on this

  exit 0

}

offline_node() {

  local -r node=$1

  grep -Fx $POWERCYCLETAG $TAGSFILE && gnt-node powercycle $node

  grep -Fx $POWEROFFTAG $TAGSFILE && gnt-node power off $node

  # TODO: do better than just --auto-promote

  # (or make sure auto-promote gets better in Ganeti)

  gnt-node modify -O yes --auto-promote $node

}

drain_node() {

  node=$1

  # TODO: do better than just --auto-promote

  # (or make sure auto-promote gets better in Ganeti)

  gnt-node modify -D yes --auto-promote $node || return 1

}

notify_action() {

  is_master || exit 0

  [[ -f $NORUNFILE ]] && exit 0

  # TODO: also implement the "start" operation for readding a node

  [[ $OCF_RESKEY_CRM_meta_notify_operation == "stop" ]] || exit 0

  [[ $OCF_RESKEY_CRM_meta_notify_type == "post" ]] || exit 0

  local -r target=$OCF_RESKEY_CRM_meta_notify_stop_uname

  local -r node=$(gnt-node list --no-headers -o name $target)

  # TODO: use drain_node when we can

  offline_node $node

  exit 0

}

return_meta() {

cat <<END

<?xml version="1.0"?>

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

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

<version>0.1</version>

<longdesc lang="en">

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

Can be used to online and offline nodes. Should be cloned on all nodes of the

cluster, with notification enabled.

</longdesc>

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

<parameters/>

<actions>

<action name="start" timeout="10s" />

<action name="stop" timeout="10s" />

<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" />

<action name="notify" timeout="1000s" />

</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 node 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

    ;;

  notify)

    # Notification of a change to the ganeti node role

    notify_action

    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