ctdb/config/ctdbd_wrapper

   1 #!/bin/sh
   2
   3 # ctdbd wrapper - start or stop CTDB
   4
   5 usage ()
   6 {
   7     echo "usage: ctdbd_wrapper <pidfile> { start | stop }"
   8     exit 1
   9 }
  10
  11 [ $# -eq 2 ] || usage
  12
  13 pidfile="$1"
  14 action="$2"
  15
  16 ############################################################
  17
  18 [ -n "$CTDB_BASE" ] || export CTDB_BASE="/etc/ctdb"
  19
  20 . "${CTDB_BASE}/functions"
  21 loadconfig "ctdb"
  22
  23 export CTDB_SOCKET
  24
  25 ctdbd="${CTDBD:-/usr/sbin/ctdbd}"
  26
  27 ############################################################
  28
  29 # ctdbd_is_running()
  30
  31 # 1. Check if ctdbd is running.
  32 #    - If the PID file is being used then, if the PID file is present,
  33 #      ctdbd is only considered to running if the PID in the file is
  34 #      active.
  35 #    - If the PID file is not being used (i.e. we're upgrading from a
  36 #      version that doesn't support it) then the presence of any ctdbd
  37 #      processes is enough proof.
  38
  39 # 2. Print a comma-separated list of PIDs that can be
  40 #    used with "pkill -s".
  41 #    - If the PID file is being used then this is just the PID in that
  42 #      file.  This also happens to be the session ID, so can be used
  43 #      to kill all CTDB processes.
  44 #    - If the PID file is not being used (i.e. upgrading) then this is
  45 #      just any ctdbd processes that are running.  Hopefully one of
  46 #      them is the session ID so that it can be used to kill all CTDB
  47 #      processes.
  48
  49 # Combining these 2 checks is an optimisation to avoid potentially
  50 # running too many pgrep/pkill processes on an already loaded system.
  51 # Trawling through /proc/ can be very expensive.
  52
  53 ctdbd_is_running ()
  54 {
  55     # If the directory for the PID file exists then respect the
  56     # existence of a PID file.
  57     _pidfile_dir=$(dirname "$pidfile")
  58     if [ -d "$_pidfile_dir" ] ; then
  59         if read _pid 2>/dev/null <"$pidfile" ; then
  60             echo "$_pid"
  61
  62             # Return value of kill is used
  63             kill -0 $_pid 2>/dev/null
  64         else
  65             # Missing/empty PID file
  66             return 1
  67         fi
  68     else
  69         if _pid=$(pgrep -f "${ctdbd}\>") ; then
  70             echo $_pid | sed -e 's@ @,@g'
  71             return 0
  72         else
  73             return 1
  74         fi
  75     fi
  76 }
  77
  78 ############################################################
  79
  80 build_ctdb_options ()
  81 {
  82     ctdb_options=""
  83
  84     maybe_set ()
  85     {
  86         # If the given variable isn't set then do nothing
  87         [ -n "$2" ] || return
  88         # If a required value for the variable and it doesn't match,
  89         # then do nothing
  90         [ -z "$3" -o "$3" = "$2" ] || return
  91
  92         val="'$2'"
  93         case "$1" in
  94             --*) sep="=" ;;
  95             -*)  sep=" " ;;
  96         esac
  97         # For these options we're only passing a value-less flag.
  98         if [ -n "$3" ] ; then
  99             val=""
 100             sep=""
 101         fi
 102
 103         ctdb_options="${ctdb_options}${ctdb_options:+ }${1}${sep}${val}"
 104     }
 105
 106     if [ -z "$CTDB_RECOVERY_LOCK" ] ; then
 107         echo "No recovery lock specified. Starting CTDB without split brain preventivon"
 108     fi
 109     maybe_set "--reclock"                "$CTDB_RECOVERY_LOCK"
 110
 111     maybe_set "--pidfile"                "$pidfile"
 112
 113     # build up ctdb_options variable from optional parameters
 114     maybe_set "--logfile"                "$CTDB_LOGFILE"
 115     maybe_set "--nlist"                  "$CTDB_NODES"
 116     maybe_set "--socket"                 "$CTDB_SOCKET"
 117     maybe_set "--public-addresses"       "$CTDB_PUBLIC_ADDRESSES"
 118     maybe_set "--public-interface"       "$CTDB_PUBLIC_INTERFACE"
 119     maybe_set "--dbdir"                  "$CTDB_DBDIR"
 120     maybe_set "--dbdir-persistent"       "$CTDB_DBDIR_PERSISTENT"
 121     maybe_set "--dbdir-state"            "$CTDB_DBDIR_STATE"
 122     maybe_set "--event-script-dir"       "$CTDB_EVENT_SCRIPT_DIR"
 123     maybe_set "--transport"              "$CTDB_TRANSPORT"
 124     maybe_set "-d"                       "$CTDB_DEBUGLEVEL"
 125     maybe_set "--notification-script"    "$CTDB_NOTIFY_SCRIPT"
 126     maybe_set "--start-as-disabled"      "$CTDB_START_AS_DISABLED"    "yes"
 127     maybe_set "--start-as-stopped "      "$CTDB_START_AS_STOPPED"     "yes"
 128     maybe_set "--no-recmaster"           "$CTDB_CAPABILITY_RECMASTER" "no"
 129     maybe_set "--no-lmaster"             "$CTDB_CAPABILITY_LMASTER"   "no"
 130     maybe_set "--lvs --single-public-ip" "$CTDB_LVS_PUBLIC_IP"
 131     maybe_set "--script-log-level"       "$CTDB_SCRIPT_LOG_LEVEL"
 132     maybe_set "--log-ringbuf-size"       "$CTDB_LOG_RINGBUF_SIZE"
 133     maybe_set "--syslog"                 "$CTDB_SYSLOG"               "yes"
 134     maybe_set "--max-persistent-check-errors" "$CTDB_MAX_PERSISTENT_CHECK_ERRORS"
 135 }
 136
 137 export_debug_variables ()
 138 {
 139     export CTDB_DEBUG_HUNG_SCRIPT CTDB_EXTERNAL_TRACE CTDB_DEBUG_LOCKS
 140 }
 141
 142 kill_ctdbd ()
 143 {
 144     _session="$1"
 145
 146     if [ -n "$_session" ] ; then
 147         pkill -9 -s "$_session" 2>/dev/null
 148     fi
 149     rm -f "$pidfile"
 150 }
 151
 152 ############################################################
 153
 154 start()
 155 {
 156     if _session=$(ctdbd_is_running) ; then
 157         echo $"CTDB is already running"
 158         return 0
 159     fi
 160
 161     # About to start new $ctdbd.  The main daemon is not running but
 162     # there may still be other processes around, so do some cleanup.
 163     # Note that starting ctdbd below will destroy the Unix domain
 164     # socket, so any processes that aren't yet completely useless soon
 165     # will be, so this can really do no harm.
 166     kill_ctdbd "$_session"
 167
 168     build_ctdb_options
 169
 170     export_debug_variables
 171
 172     if [ "$CTDB_SUPPRESS_COREFILE" = "yes" ]; then
 173         ulimit -c 0
 174     else
 175         ulimit -c unlimited
 176     fi
 177
 178     mkdir -p $(dirname "$pidfile")
 179
 180     if [ -n "$CTDB_VALGRIND" -a "$CTDB_VALGRIND" != "no" ] ; then
 181         if [ "$CTDB_VALGRIND" = "yes" ] ; then
 182             ctdbd="valgrind -q --log-file=/var/log/ctdb_valgrind ${ctdbd}"
 183         else
 184             ctdbd="${CTDB_VALGRIND} ${ctdbd}"
 185         fi
 186         ctdb_options="${ctdb_options} --valgrinding"
 187     fi
 188
 189     if [ "$CTDB_SYSLOG" != "yes" ] ; then
 190         logger -t ctdbd "CTDB is being run without syslog enabled.  Logs will be in ${CTDB_LOGFILE:-/var/log/log.ctdb}"
 191     fi
 192
 193     eval "$ctdbd" "$ctdb_options" || return 1
 194
 195     # Wait until ctdbd has started and is ready to respond to clients.
 196     _pid=""
 197     _timeout="${CTDB_STARTUP_TIMEOUT:-10}"
 198     _count=0
 199     while [ $_count -lt $_timeout ] ; do
 200         # If we don't have the PID then try to read it.
 201         [ -n "$_pid" ] || read _pid 2>/dev/null <"$pidfile"
 202
 203         # If we got the PID but the PID file has gone or the process
 204         # is no longer running then stop waiting... CTDB is dead.
 205         if [ -n "$_pid" ] ; then
 206             if [ ! -e "$pidfile" ] || ! kill -0 "$_pid" 2>/dev/null ; then
 207                 echo "CTDB exited during initialisation - check logs."
 208                 kill_ctdbd "$_pid"
 209                 drop_all_public_ips >/dev/null 2>&1
 210                 return 1
 211             fi
 212
 213             if ctdb runstate first_recovery startup running >/dev/null 2>&1 ; then
 214                 return 0
 215             fi
 216         fi
 217
 218         _count=$(($_count + 1))
 219         sleep 1
 220     done
 221
 222     echo "Timed out waiting for initialisation - check logs - killing CTDB"
 223     kill_ctdbd "$_pid"
 224     drop_all_public_ips >/dev/null 2>&1
 225     return 1
 226 }
 227
 228 stop()
 229 {
 230     if ! _session=$(ctdbd_is_running) ; then
 231         echo "CTDB is not running"
 232         return 0
 233     fi
 234
 235     ctdb shutdown
 236
 237     # Wait for remaining CTDB processes to exit...
 238     _timeout=${CTDB_SHUTDOWN_TIMEOUT:-30}
 239     _count=0
 240     while [ $_count -lt $_timeout ] ; do
 241         pkill -0 -s "$_session" 2>/dev/null || return 0
 242
 243         _count=$(($_count + 1))
 244         sleep 1
 245     done
 246
 247     echo "Timed out waiting for CTDB to shutdown.  Killing CTDB processes."
 248     kill_ctdbd "$_session"
 249     drop_all_public_ips >/dev/null 2>&1
 250
 251     sleep 1
 252
 253     if pkill -0 -s "$_session" ; then
 254         # If SIGKILL didn't work then things are bad...
 255         echo "Failed to kill all CTDB processes.  Giving up."
 256         return 1
 257     fi
 258
 259     return 0
 260 }
 261
 262 ############################################################
 263
 264 # Allow notifications for start/stop.
 265 if [ -x "$CTDB_BASE/rc.ctdb" ] ; then
 266     "$CTDB_BASE/rc.ctdb" "$action"
 267 fi
 268
 269 case "$action" in
 270     start) start ;;
 271     stop)  stop  ;;
 272     *)
 273         echo "usage: $0 {start|stop}"
 274         exit 1
 275 esac