[Samba] ctdb do not start nmbd if serving AD

[Rowland Penny]

On 18/07/14 07:41, steve wrote:
> ctdb 2.5.3 dual node file server with 4.1.9 serving AD domain
>
> Hi
> We have enabled the script at:
> /etc/cdb/events.d/50.samba
> but when we are the enabled node, it starts not only smbd but also nmbd.
> This doesn't make sense in an AD domain. I've tried disabling nmbd
> starting under openSUSE's systemd but ctdb overrides that, I've had a
> look at the script but can't decipher the bit that starts nmbd.
>
> Qn: Do we have a 'start smbd' version of 50.samba?
>
> Or could any script guru get this to disable nmbd;)
> Cheers and TIA,
> Steve
> Oh, and thanks for an amazing piece of software in ctdb.
>
> #!/bin/sh
> # ctdb event script for Samba
>
> [ -n "$CTDB_BASE" ] || \
>      export CTDB_BASE=$(cd -P $(dirname "$0") ; dirname "$PWD")
>
> . $CTDB_BASE/functions
>
> detect_init_style
>
> case $CTDB_INIT_STYLE in
> 	suse)
> 		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smb}
> 		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-nmb}
> 		;;
> 	debian)
> 		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-samba}
> 		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-""}
> 		;;
> 	*)
> 		# Use redhat style as default:
> 		CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smb}
> 		CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-""}
> 		;;
> esac
>
> service_name="samba"
>
> loadconfig
>
> ctdb_setup_service_state_dir
>
> service_start ()
> {
>      # make sure samba is not already started
>      service "$CTDB_SERVICE_SMB" stop > /dev/null 2>&1
>      if [ -n "$CTDB_SERVICE_NMB" ] ; then
> 	service "$CTDB_SERVICE_NMB" stop > /dev/null 2>&1
>      fi
>      killall -0 -q smbd && {
> 	sleep 1
> 	# make absolutely sure samba is dead
> 	killall -q -9 smbd
>      }
>      killall -0 -q nmbd && {
> 	sleep 1
> 	# make absolutely sure samba is dead
> 	killall -q -9 nmbd
>      }
>
>      # start Samba service. Start it reniced, as under very heavy load
>      # the number of smbd processes will mean that it leaves few cycles
>      # for anything else
>      net serverid wipe
>
>      if [ -n "$CTDB_SERVICE_NMB" ] ; then
> 	nice_service "$CTDB_SERVICE_NMB" start || die "Failed to start nmbd"
>      fi
>
>      nice_service "$CTDB_SERVICE_SMB" start || die "Failed to start
> samba"
> }
>
> service_stop ()
> {
>      service "$CTDB_SERVICE_SMB" stop
>      if [ -n "$CTDB_SERVICE_NMB" ] ; then
> 	service "$CTDB_SERVICE_NMB" stop
>      fi
> }
>
> ######################################################################
> # Show the testparm output using a cached smb.conf to avoid delays due
> # to registry access.
>
> smbconf_cache="$service_state_dir/smb.conf.cache"
>
> testparm_foreground_update ()
> {
>      _timeout="$1"
>
>      if ! _out=$(timeout $_timeout testparm -v -s 2>/dev/null) ; then
> 	if [ -f "$smbconf_cache" ] ; then
> 	    echo "WARNING: smb.conf cache update failed - using old cache file"
> 	    return 1
> 	else
> 	    die "ERROR: smb.conf cache create failed"
> 	fi
>      fi
>
>      _tmpfile="${smbconf_cache}.$$"
>      # Patterns to exclude...
>      pat='^[[:space:]]+(registry[[:space:]]+shares|include|copy|
> winbind[[:space:]]+separator)[[:space:]]+='
>      echo "$_out" | grep -Ev "$pat" >"$_tmpfile"
>      mv "$_tmpfile" "$smbconf_cache" # atomic
>
>      return 0
> }
>
> testparm_background_update ()
> {
>      _timeout="$1"
>
>      testparm_foreground_update $_timeout >/dev/null 2>&1 </dev/null &
> }
>
> testparm_cat ()
> {
>      testparm -s "$smbconf_cache" "$@" 2>/dev/null
> }
>
> list_samba_shares ()
> {
>      testparm_cat |
>      sed -n -e 's@^[[:space:]]*path[[:space:]]*=[[:space:]]@@p' |
>      sed -e 's/"//g'
> }
>
> list_samba_ports ()
> {
>      testparm_cat --parameter-name="smb ports" |
>      sed -e 's@,@ @g'
> }
>
> ###########################
>
> ctdb_start_stop_service
>
> is_ctdb_managed_service || exit 0
>
> ###########################
>
> case "$1" in
>       startup)
> 	ctdb_service_start
> 	;;
>
>       shutdown)
> 	ctdb_service_stop
> 	;;
>
>       monitor)
> 	testparm_foreground_update 10
> 	ret=$?
>
> 	smb_ports="$CTDB_SAMBA_CHECK_PORTS"
> 	if [ -z "$smb_ports" ] ; then
> 	    smb_ports=$(list_samba_ports)
> 	    [ -n "$smb_ports" ] || die "Failed to set smb ports"
> 	fi
> 	ctdb_check_tcp_ports $smb_ports || exit $?
>
> 	if [ "$CTDB_SAMBA_SKIP_SHARE_CHECK" != "yes" ] ; then
> 	    list_samba_shares | ctdb_check_directories || exit $?
> 	fi
>
> 	if [ $ret -ne 0 ] ; then
> 	    testparm_background_update 10
> 	fi
> 	;;
>
>      *)
> 	ctdb_standard_event_handler "$@"
> 	;;
> esac
>
> exit 0
>
OK Steve, on opensuse try this:

Change

     suse)
         CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smb}
         CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-nmb}

To

     suse)
         CTDB_SERVICE_SMB=${CTDB_SERVICE_SMB:-smb}
         #CTDB_SERVICE_NMB=${CTDB_SERVICE_NMB:-nmb}

This should let the script stop any instances of the nmbd deamon that 
are running, but would then wouldn't start nmbd again.

I think that the script would have to be rewritten for any other OS.

Rowland