scripts/VolumeGroup.ocf

   1 #!/bin/sh
   2 #
   3 # VolumeGroup
   4 #
   5 # Description:  Manages an LVM2 volume group as an HA resource in
   6 #               an OCF-compliant cluster
   7 #
   8 #
   9 # Authors:      Alan Robertson, Lars Marowsky-Bree, Florian Haas,
  10 #               and others from the Linux-HA project
  11 # License:      GNU General Public License (GPL)
  12 # Copyright:    (C) 2002 - 2005 International Business Machines, Inc.
  13 #               (C) 2010 LINBIT HA-Solutions GmbH
  14 #
  15 #       This code significantly inspired by the LVM resource
  16 #       in FailSafe by Lars Marowsky-Bree
  17 #
  18 #######################################################################
  19 # Initialization:
  20
  21 : ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/resource.d/heartbeat}
  22 . ${OCF_FUNCTIONS_DIR}/.ocf-shellfuncs
  23
  24 #######################################################################
  25
  26
  27 usage() {
  28   methods=`VolumeGroup_methods`
  29   methods=`echo $methods | tr ' ' '|'`
  30   cat <<EOF
  31         usage: $0 $methods
  32
  33         $0 manages an LVM Volume Group (VG) as an HA resource
  34
  35         The 'start' operation brings the given volume online
  36         The 'stop' operation takes the given volume offline
  37         The 'status' operation reports whether the volume is available
  38         The 'monitor' operation reports whether the volume seems present
  39         The 'validate-all' operation checks whether the OCF parameters are valid
  40         The 'methods' operation reports on the methods $0 supports
  41
  42 EOF
  43 }
  44
  45 meta_data() {
  46         cat <<EOF
  47 <?xml version="1.0"?>
  48 <!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
  49 <resource-agent name="VolumeGroup">
  50 <version>1.0</version>
  51
  52 <longdesc lang="en">
  53 Resource script for an LVM Volume Group.
  54 </longdesc>
  55 <shortdesc lang="en">Controls the availability of an LVM Volume Group</shortdesc>
  56
  57 <parameters>
  58 <parameter name="volgrpname" unique="0" required="1">
  59 <longdesc lang="en">
  60 The name of volume group.
  61 </longdesc>
  62 <shortdesc lang="en">Volume group name</shortdesc>
  63 <content type="string" default="" />
  64 </parameter>
  65 <parameter name="exclusive" unique="0" required="0">
  66 <longdesc lang="en">
  67 If set, the volume group will be activated exclusively.
  68 </longdesc>
  69 <shortdesc lang="en">Exclusive activation</shortdesc>
  70 <content type="boolean" default="false" />
  71 </parameter>
  72 </parameters>
  73
  74 <actions>
  75 <action name="start" timeout="30" />
  76 <action name="stop" timeout="30" />
  77 <action name="status" timeout="30" />
  78 <action name="monitor" depth="0" timeout="30" interval="10" />
  79 <action name="methods" timeout="5" />
  80 <action name="meta-data" timeout="5" />
  81 <action name="validate-all" timeout="5" />
  82 </actions>
  83 </resource-agent>
  84 EOF
  85 }
  86
  87 #
  88 # methods: What methods/operations do we support?
  89 #
  90 VolumeGroup_methods() {
  91   cat <<EOF
  92         start
  93         stop
  94         status
  95         monitor
  96         methods
  97         validate-all
  98         usage
  99 EOF
 100 }
 101
 102 #
 103 # Report on LVM volume status. VG may be reported as active
 104 # ($OCF_SUCCESS) or inactive ($OCF_NOT_RUNNING)
 105 #
 106 VolumeGroup_status() {
 107
 108     VGOUT=`vgdisplay -v $OCF_RESKEY_volgrpname 2>&1` || exit $OCF_ERR_GENERIC
 109     echo "$VGOUT" | grep -i 'Status[ \t]*available' >/dev/null
 110     rc=$?
 111
 112     if [ $rc -eq 0 ]; then
 113         ocf_log debug "LVM Volume Group $OCF_RESKEY_volgrpname is available (started)"
 114     else
 115         ocf_log debug "LVM Volume Group $OCF_RESKEY_volgrpname is not available (stopped)"
 116         return $OCF_NOT_RUNNING
 117     fi
 118
 119     if echo "$VGOUT" | grep -i 'Access.*read/write' >/dev/null; then
 120         ocf_log debug "Volume $OCF_RESKEY_volgrpname is available read/write (running)"
 121     else
 122         ocf_log debug "Volume $OCF_RESKEY_volgrpname is available read-only (running)"
 123     fi
 124
 125     return $OCF_SUCCESS
 126 }
 127
 128 #
 129 # Monitor the volume - does it really seem to be working? May report
 130 # $OCF_SUCCESS or $OCF_NOT_RUNNING like VolumeGroup_status, plus
 131 # $OCF_ERR_GENERIC in case vgck reports an error.
 132 #
 133 VolumeGroup_monitor() {
 134     if ! VolumeGroup_status $OCF_RESKEY_volgrpname; then
 135         ocf_log info "LVM Volume Group $OCF_RESKEY_volgrpname is offline"
 136         return $OCF_NOT_RUNNING
 137     fi
 138
 139     ocf_run vgck $OCF_RESKEY_volgrpname || exit $OCF_ERR_GENERIC
 140
 141     return $OCF_SUCCESS
 142 }
 143
 144 #
 145 # Activate the volume group, either locally (if $OCF_RESKEY_exclusive
 146 # is false or unset), or exclusively (if $OCF_RESKEY_exclusive is
 147 # true).
 148 # Either returns successfully, or exits with $OCF_ERR_GENERIC.
 149 #
 150 VolumeGroup_start() {
 151
 152   ocf_log info "Activating volume group $OCF_RESKEY_volgrpname"
 153   ocf_run vgscan
 154
 155   local active_mode
 156   active_mode="ly"
 157   if ocf_is_true "$OCF_RESKEY_exclusive" ; then
 158       active_mode="ey"
 159   fi
 160
 161   ocf_run vgchange -a $active_mode $OCF_RESKEY_volgrpname || exit $OCF_ERR_GENERIC
 162
 163   if ! VolumeGroup_status $OCF_RESKEY_volgrpname; then
 164     ocf_log err "LVM: $OCF_RESKEY_volgrpname did not activate correctly"
 165     exit $OCF_ERR_GENERIC
 166   fi
 167
 168   return $OCF_SUCCESS
 169 }
 170
 171 #
 172 # Deactivate the volume group.
 173 # Either returns successfully, or exits with $OCF_ERR_GENERIC.
 174 #
 175 VolumeGroup_stop() {
 176     if ! VolumeGroup_status; then
 177         ocf_log debug "Volume Group $OCF_RESKEY_volgrpname already stopped"
 178         return $OCF_SUCCESS
 179     fi
 180
 181     ocf_log info "Deactivating volume group $OCF_RESKEY_volgrpname"
 182     ocf_run vgchange -a ln $OCF_RESKEY_volgrpname || exit $OCF_ERR_GENERIC
 183
 184     if VolumeGroup_status; then
 185         ocf_log err "LVM: $OCF_RESKEY_volgrpname did not stop correctly"
 186         exit $OCF_ERR_GENERIC
 187     fi
 188
 189     return $OCF_SUCCESS
 190 }
 191
 192 #
 193 # Check whether the OCF instance parameters are valid.
 194 # Either returns successfully, or exits with
 195 # $OCF_ERR_CONFIGURED if required parameters are missing;
 196 # $OCF_ERR_INSTALLED if required binaries are missing;
 197 # $OCF_ERR_GENERIC in case of any other error.
 198 #
 199 VolumeGroup_validate_all() {
 200
 201     if [ -z $OCF_RESKEY_volgrpname ]; then
 202         ocf_log err 'Missing required parameter "volgrpname"!'
 203         exit $OCF_ERR_CONFIGURED
 204     fi
 205
 206     check_binary vgchange
 207     check_binary vgck
 208     check_binary vgdisplay
 209
 210     # Run the following tests only if we're not invoked by a probe
 211     # operation
 212     if ! ocf_is_probe; then
 213         # Off-the-shelf tests...
 214         vgck "$OCF_RESKEY_volgrpname" >/dev/null 2>&1
 215         if [ $? -ne 0 ]; then
 216             ocf_log err "Volume group $OCF_RESKEY_volgrpname does not exist or contains error!"
 217             exit $OCF_ERR_GENERIC
 218         fi
 219
 220         # Double-check
 221         vgdisplay -v "$OCF_RESKEY_volgrpname" >/dev/null 2>&1
 222         if [ $? -ne 0 ]; then
 223             ocf_log err "Volume group $OCF_RESKEY_volgrpname does not exist or contains error!"
 224             exit $OCF_ERR_GENERIC
 225         fi
 226     fi
 227
 228     return $OCF_SUCCESS
 229 }
 230
 231 #
 232 # 'main' starts here...
 233 #
 234 if [ $# -ne 1 ]; then
 235     usage
 236     exit $OCF_ERR_ARGS
 237 fi
 238
 239 case $1 in
 240   meta-data)    meta_data
 241                 exit $OCF_SUCCESS;;
 242
 243   methods)      VolumeGroup_methods
 244                 exit $OCF_SUCCESS;;
 245
 246   usage)        usage
 247                 exit $OCF_SUCCESS;;
 248   *)            ;;
 249 esac
 250
 251 # Everything except usage and meta-data must pass the validate test
 252 VolumeGroup_validate_all
 253
 254 # What kind of method was invoked?
 255 case "$1" in
 256     start)
 257         VolumeGroup_start
 258         ;;
 259     stop)
 260         VolumeGroup_stop
 261         ;;
 262     status)
 263         VolumeGroup_status
 264         ;;
 265     monitor)
 266         VolumeGroup_monitor
 267         ;;
 268     validate-all)
 269         ;;
 270     notify|promote|demote|migrate_from|migrate_to)
 271         usage
 272         exit $OCF_ERR_UNIMPLEMENTED
 273         ;;
 274     *)  usage
 275         exit $OCF_ERR_ARGS
 276         ;;
 277 esac
 278
 279 exit $?