[Bug 1007273] Re: autofs does not start automatically after reboot

[Andreas Greve]

If the automounter daemon starts before the ypbind daemon is ready to
answer queries than the automounter does not work for nfs mounts
depending on nis (other mount types not tested), even if the ypbind
daemon later gets ready.

There exists  a race condition in ubuntu 12.04  between autofs.conf and ypbind.conf which leads to the above described problem.
 

The reason for that is that ypbind.conf  sometimes lies about the state
of the ypbind daemon. The post-start script in ypbind.conf terminates
after 5 tries ( about 5 sec.) to contact the nis-server or when ypbind
respawns and change its state to running. Upstart than kills the
dedicated wait-for-state job. Now  autofs.conf starts the automounter
daemon but the ypbind daemon is not ready to work and  the automounter
does not work for nfs automounts too. I have to restart the automounter
daemon manualy (stop autofs; start autofs) after the ypbind daemon is
working to get nfs automounts working.

I solve the problem by changing ypbind.conf so that the "test loop" in
post-start script only terminates when ypwhich is working.

Additional I add a  parameter TIMEOUT=300 to the exec wait-for-state ....  call in start-ypbind.conf because the default default timeout of 30 sec is to short for my network and leads to the above described problem.
OK the 5min time out is not a 100% resolution. For a 100% resolution of the race condition I have to set the parameter WAIT_FOREVER="T".


autofs.conf:
-------------------vvv snip vvvv----------------------------------
description    "NIS binding process"
author        "Steve Langasek <steve.langasek at canonical.com>"

# Patterned after the statd.conf job in nfs-common.
start on (started portmap ON_BOOT=
          or (started portmap ON_BOOT=y
              and ((filesystem and static-network-up) or failsafe-boot)))
stop on stopping portmap or runlevel [!2345]

expect daemon
respawn
respawn limit 3 250

pre-start script
    NISSERVER=false

    [ -f /usr/sbin/ypbind ] && [ -f /etc/defaultdomain ] || { stop; exit
0; }

    [ -f /etc/default/nis ] && . /etc/default/nis

    oname=$(domainname)
    nname=$(cat /etc/defaultdomain)
    if [ "$oname" != "$nname" ]; then
        echo "Setting NIS domainname to: $nname"
        domainname "$nname"
    fi

    case $NISSERVER in
        master|slave|[Yy]*)
            ;;
        *)
            case $NISCLIENT in
                false|[nN]*)
                    { stop; exit 0; }
                    ;;
            esac           
            ;;
    esac

    if [ "$NISSERVER" != false ]; then
        start wait-for-state WAIT_FOR=ypserv WAITER=ypbind WAIT_STATE=running >/dev/null
    fi
end script

script
    [ -f /etc/default/nis ] && . /etc/default/nis

    BROADCAST=-broadcast
    while read arg junk ; do
        case $arg in
            ypserver|domain)
                BROADCAST=
                ;;
        esac
    done < /etc/yp.conf

    exec ypbind $BROADCAST $YPBINDARGS
end script

post-start script
    # Give ypbind time to finish starting up, so that jobs depending on
    # it are actually able to use the maps
    echo -n "Binding to YP server "
    bound=
        #for i in 1 2 3 4 5
    while [ -z "${bound}" ]
        do
        echo -n "."
      #if status ypbind | grep -q start/respawn; then
      #    # something killed ypbind; short-circuit here instead
      #    # of continuing to try to call ypwhich, since that
      #    # can take more than a minute.
      #    break
      #fi
      if [ "$(ypwhich 2>/dev/null)" != "" ]; then
        bound=1
        break
      fi
      sleep 3
    done
    if [ "$bound" ]; then
        echo "done"
                echo "$(date) ypbind is running"
                sleep 5
    #else
    #    echo "backgrounded"
    fi
end script
---------------^^^ snip  ^^^-----------------------------------

start-ypbind.conf:
-------------------vvv snip vvvv----------------------------------
description    "block processes that need ypbind"
author        "Steve Langasek <steve.langasek at canonical.com>"

instance $JOB
env JOB=

start on (starting autofs or starting am-utils or starting gdm
          or starting lightdm or starting atd)

task

exec start wait-for-state WAITER="$JOB" WAIT_FOR=ypbind WAIT_STATE=running TIMEOUT=300
---------------^^^ snip  ^^^----------------------------------

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https://bugs.launchpad.net/bugs/1007273

Title:
  autofs does not start automatically after reboot

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