From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Kent Subject: Re: two /net paths to the same local mount? Date: Wed, 30 Jun 2010 21:12:57 +0800 Message-ID: <1277903577.2819.8.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> 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=ZFf6ruuekNOijSi14TKGFilaWKI=; b=OcaP/Pnt7rs3EAHSOvQUBeKakEAMvH5o4U2+eXEr6NOQIgeC3jlvYT9p+LaCAvjEHNlZBZMMdotTLZwDLSNEcwvo9vnvc8waiNmNpR4qsi2mABGQF8o7ePg8LfgIvOj/hZQpWIr2XG09mzuyAjcBnjBdEvzjgspdBh6DwGeJyH0= In-Reply-To: <4C2A1C03.1070908@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 Cc: autofs@linux.kernel.org 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. 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 > > > > >