From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Kent Subject: Re: two /net paths to the same local mount? Date: Thu, 01 Jul 2010 10:19:08 +0800 Message-ID: <1277950748.3137.2.camel@localhost> References: <4C1FBABF.5060207@oracle.com> <35D166B0274C8DB77A6BE435@[192.168.1.100]> <4C225338.8070008@oracle.com> <1277348429.2841.44.camel@localhost> <4C2A1C03.1070908@oracle.com> <1277903577.2819.8.camel@localhost> <4C2B5B4E.3010501@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=messagingengine.com; h=subject:from:to:cc:in-reply-to:references:content-type:date:message-id:mime-version:content-transfer-encoding; s=smtpout; bh=lzwIRJ49TfnrIif74dH+nudd6X8=; b=WYJAXnK0+So0HoHKBpSO2PYPYoSlP2r3Jo5p9+MrcHMNfOywfnycgoKjkhgk8gJa374G0tphBn0R3y3XSi41UiuyygvSYfT4o1jspuE0QXRJW3ya2HxaqRM0BL8f8visnPZNUVJ3/As31UgfXPMHfLYP3NEK6GvNy6bkXa8mqT8= In-Reply-To: <4C2B5B4E.3010501@oracle.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: autofs-bounces@linux.kernel.org Errors-To: autofs-bounces@linux.kernel.org To: chris.quenelle@oracle.com Cc: autofs@linux.kernel.org On Wed, 2010-06-30 at 07:57 -0700, Chris Quenelle wrote: > On Wednesday June 30 6:12AM, Ian Kent wrote: > > On Tue, 2010-06-29 at 09:14 -0700, Chris Quenelle wrote: > >> Ian, > >> > >> Thanks again for your help. > >> I have syslog-ng installed, and I can't figure out how to tell > >> if "daemon.*" is being sent somewhere or not. "daemon" doesn't > >> appear anywhere in /etc/syslog-ng/syslog-ng.conf > > > > Well, you need to consult the man page for the configuration file then > > don't you. > > Sorry for sounding lazy there. I've never used syslog-ng before, and > I read the man page for a while without figuring how the old style > of names/categories mapped to the new system. I'll continue to fiddle > around and see if I can find out what's going on. > > Thanks for helping me get started with the debugging output. > > My autofs map looks like this: > % ypcat -k auto.master | grep /net > /net -hosts -intr,nosuid,retrans=10,retry=3,nobrowse > > But I'm not sure that helps. Is automount crashing, ie. does it show up in a ps listing after you see it hang? > > --chris > > > > > > > For me, when syslog was in use and now with rsyslog, I just add a new > > line to send all the facility daemon output to a log file. > > > > I add the line: > > > > daemon.* /var/log/debug > > > > to the configuration and then > > > > touch /var/log/debug > > > > and finally restart logging service. > > > > You probably should post your autofs maps as well. > > > >> But when I grep /var/log/messages I see: > >> > >> % grep automount messages > >> Jun 29 02:41:14 carabas automount[11786]: lookup_mount: lookup(yp): key "Codemgr_wsdata" not found in map > >> Jun 29 02:41:14 carabas automount[11786]: lookup_mount: lookup(yp): key "Codemgr_wsdata" not found in map > >> Jun 29 03:17:45 carabas automount[11786]: lookup_mount: lookup(yp): key "opt" not found in map > >> Jun 29 03:24:27 carabas automount[11786]: lookup_mount: lookup(yp): key "Codemgr_wsdata" not found in map > >> Jun 29 03:24:27 carabas automount[11786]: lookup_mount: lookup(yp): key "Codemgr_wsdata" not found in map > >> Jun 29 09:04:46 carabas automount[11786]: Debug logging set for /net > >> Jun 29 09:09:22 carabas automount[11786]: get_pkt: message pending on control fifo. > >> Jun 29 09:09:22 carabas automount[11786]: Basic logging set for /net > >> > >> I didn't get the get_pkg message until I turned off debug logging. > >> > >> While logging was set to debug, I tried the hanging ls command again, and > >> I also tried listing a different file system that was actually remote. > >> I didn't see any log messages for those operations. > >> > >> Notes: > >> > >> 1. /etc/host.conf says only: > >> order hosts, bind > >> multi on > >> > >> 2. No mount.nfs processes are running when the ls command hangs > >> on the local mount. > >> > >> > >> Ian Kent wrote: > >>> On Wed, 2010-06-23 at 11:32 -0700, Chris Quenelle wrote: > >>>> Thanks for your time guys! > >>>> > >>>> It turns out it's not a general bug. I was just applying > >>>> a pessimistic interpretation without checking. > >>>> > >>>> After more testing, it turns out it's just problem > >>>> on one machine, for two mount points under one > >>>> host alias. > >>>> > >>>> I'm interested in knowing more about how I could > >>>> debug the situation without just rebooting and > >>>> hoping it doesn't happen again. > >>>> > >>>> Here's my scenario: > >>>> > >>>> I have three exported filesystems. > >>>> I can use three host aliases to refer to my own machine. > >>>> (carabas, carabas.sfbay, carabas.sfbay.sun.com) > >>>> > >>>> /etc/hosts says: > >>>> [IP addr] carabas.sfbay.sun.com carabas > >>>> > >>>> > >>>> All filesystems work under all /net/foo aliases > >>>> except two of them hang when accessed via one > >>>> of the host aliases. > >>> > >>> Are you sure the address lookup is returning what you think it does? > >>> What's in /etc/host.conf? > >>> > >>>> % showmount -e localhost > >>>> Export list for localhost: > >>>> /export/home3 * > >>>> /export/home2 * > >>>> /export/home1 * > >>>> > >>>> > >>>> % df -kl > >>>> Filesystem 1K-blocks Used Available Use% Mounted on > >>>> /dev/sda2 69575344 3408900 66166444 5% / > >>>> udev 8222568 148 8222420 1% /dev > >>>> /dev/sdb1 71671728 26507132 45164596 37% /export/home1 > >>>> /dev/sdc1 71671728 8545196 63126532 12% /export/home2 > >>>> /dev/sdd1 71671728 5375672 66296056 8% /export/home3 > >>>> /export/home1 71671728 26507128 45164600 37% /net/carabas/export/home1 > >>>> /export/home2 71671728 8545196 63126532 12% /net/carabas.sfbay/export/home2 > >>>> /export/home1 71671728 26507128 45164600 37% /net/carabas.sfbay/export/home1 > >>>> /export/home3 71671728 5375672 66296056 8% /net/carabas.sfbay/export/home3 > >>>> /export/home1 71671728 26507128 45164600 37% /net/carabas.sfbay.sun.com/export/home1 > >>>> /export/home2 71671728 8545196 63126532 12% /net/carabas.sfbay.sun.com/export/home2 > >>>> /export/home3 71671728 5375672 66296056 8% /net/carabas.sfbay.sun.com/export/home3 > >>>> > >>>> > >>>> % strace ls /net/carabas/export/home2 > >>>> ... > >>>> ... > >>>> mmap(NULL, 217016, PROT_READ, MAP_SHARED, 4, 0) = 0x2b2388370000 > >>>> close(4) = 0 > >>>> close(3) = 0 > >>>> open("/net/carabas/export/home2", O_RDONLY|O_NONBLOCK|O_DIRECTORY > >>> > >>> What does a ps listing give you when it is blocked? > >>> Any mount.nfs processes? > >>> > >>> That's sign that automount thinks that the mount isn't local and is > >>> probably trying to mount from a possibly non-existent ip address. > >>> > >>>> I hit ctrl-C when the ls command hangs. Above is the tail of the strace output. > >>>> It doesn't tell you much, the interesting stuff happens in the automounter. > >>>> > >>>> Is there a error log file for the automounter that is enabled by default? > >>>> Is there an easy recipe for restarting the automounter with debugging output on? > >>> > >>> You need to ensure that debug logging is being recorded in syslog. > >>> Ensure you are sending daemon.* somewhere. > >>> > >>> Then > >>> > >>> automount -l debug /net > >>> > >>> will start the debug logging and > >>> > >>> automount -l err /net > >>> > >>> will set it back to no logging. > >>> > >>> That is depending on the version of autofs you are using. > >>> > >>> If you don't see this option in the automount(8) man page you don't have > >>> this option and all you can do is enable debug logging in the > >>> configuration. > >>> > >>> Ian > >>> > >>> > >> > > > > >