[ClusterLabs] CRM managing ADSL connection; failure not handled

[Andrei Borzenkov]

24.08.2015 12:35, Tom Yates пишет:
> I've got a failover firewall pair where the external interface is ADSL;
> that is, PPPoE.  i've defined the service thus:
>
> primitive ExternalIP lsb:hb-adsl-helper \
>          op monitor interval="60s"
>
> and in addition written a noddy script /etc/init.d/hb-adsl-helper, thus:
>
> #!/bin/bash
> RETVAL=0
> start() {
>          /sbin/pppoe-start
> }
> stop() {
>          /sbin/pppoe-stop
> }
> case "$1" in
>    start)
>          start
>          ;;
>    stop)
>          stop
>          ;;
>    status)
>          /sbin/ifconfig ppp0 >& /dev/null && exit 0
>          exit 1
>          ;;
>    *)
>          echo $"Usage: $0 {start|stop|status}"
>          exit 3
> esac
> exit $?
>
> The problem is that sometimes the ADSL connection falls over, as they
> do, eg:
>
> Aug 20 11:42:10 positron pppd[2469]: LCP terminated by peer
> Aug 20 11:42:10 positron pppd[2469]: Connect time 8619.4 minutes.
> Aug 20 11:42:10 positron pppd[2469]: Sent 1342528799 bytes, received
> 164420300 bytes.
> Aug 20 11:42:13 positron pppd[2469]: Connection terminated.
> Aug 20 11:42:13 positron pppd[2469]: Modem hangup
> Aug 20 11:42:13 positron pppoe[2470]: read (asyncReadFromPPP): Session
> 1735: Input/output error
> Aug 20 11:42:13 positron pppoe[2470]: Sent PADT
> Aug 20 11:42:13 positron pppd[2469]: Exit.
> Aug 20 11:42:13 positron pppoe-connect: PPPoE connection lost;
> attempting re-connection.
>
> CRMd then logs a bunch of stuff, followed by
>
> Aug 20 11:42:18 positron lrmd: [1760]: info: rsc:ExternalIP:8: stop
> Aug 20 11:42:18 positron lrmd: [28357]: WARN: For LSB init script, no
> additional parameters are needed.
> [...]
> Aug 20 11:42:18 positron pppoe-stop: Killing pppd
> Aug 20 11:42:18 positron pppoe-stop: Killing pppoe-connect
> Aug 20 11:42:18 positron lrmd: [1760]: WARN: Managed ExternalIP:stop
> process 28357 exited with return code 1.
>
>
> At this point, the PPPoE connection is down, and stays down.  CRMd
> doesn't fail the group which contains both internal and external
> interfaces over to the other node, but nor does it try to restart the
> service.  I'm fairly sure this is because I've done something
> boneheaded, but I can't get my bone head around what it might be.
>
> Any light anyone can shed is much appreciated.
>
>

If stop operation failed resource state is undefined; pacemaker won't do 
anything with this resource. Either make sure script returns success 
when appropriate or the only option is to make it fence node where 
resource was active.