From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Quenelle Subject: Re: two /net paths to the same local mount? Date: Tue, 29 Jun 2010 09:14:59 -0700 Message-ID: <4C2A1C03.1070908@oracle.com> References: <4C1FBABF.5060207@oracle.com> <35D166B0274C8DB77A6BE435@[192.168.1.100]> <4C225338.8070008@oracle.com> <1277348429.2841.44.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1277348429.2841.44.camel@localhost> 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: Ian Kent Cc: autofs@linux.kernel.org 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 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 > >