Bug 1010191 - bg nfs mount option doesn't work in case of hostname lookup failures
Summary: bg nfs mount option doesn't work in case of hostname lookup failures
Keywords:
Status: CLOSED EOL
Alias: None
Product: Fedora
Classification: Fedora
Component: nfs-utils
Version: 19
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Steve Dickson
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-09-20 08:06 UTC by Tore Anderson
Modified: 2015-02-17 17:15 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-02-17 17:15:57 UTC
Type: Bug
Embargoed:


Attachments (Terms of Use)

Description Tore Anderson 2013-09-20 08:06:52 UTC
Description of problem:

I have several NFS mounts defined in /etc/fstab. They tend to fail to mount at boot time. This likely happens because the mount attempt is started before the network is fully operational, and therefore before the system is able to resolve the hostname of the NFS servers using DNS. However as the mounts aren't essential to the boot process, this initial failure doesn't really matter all that much, as long as they get mounted eventually I'm happy.

Therefore I specify the "bg" option to instruct the mount process to keep trying to mount them until it succeeds. According to man 5 nfs:

                      If the bg option is specified, a timeout or failure
                      causes the mount(8) command to fork a child  which  con‐
                      tinues to attempt to mount the export. The parent imme‐
                      diately returns with a zero exit code. This is known as
                      a "background" mount.

Version-Release number of selected component (if applicable):

nfs-utils-1.2.8-4.0.fc19.x86_64

How reproducible:

100%

Steps to Reproduce:
1. Purge all "nameserver" entries from /etc/resolv.conf (required only to cause the exact same "System error" failures I see in my logs)
2. sudo mount nonexistant.domain.haha:/foo /mnt -o bg ; pgrep -f mount || echo no mount process running in background

Actual results:

Output from #2 is:

mount.nfs: Failed to resolve server nonexistant.domain.haha: System error
no mount process running in background

(If step #1 is omitted, the error message is instead "Name or service not known", but the result is the same - the bg option fails to work as advertised.)

Expected results:

A backgrounded mount process would appear in the process list, and (assuming I had specified a valid NFS server/export) the file system would eventually be mounted after reinstating the nameserver entry in /etc/resolv.conf.

Additional info:

These messages from /var/log/messages shed some light on what's going on:

Sep 20 09:33:52 echo systemd[1]: Mounting /music...
Sep 20 09:33:52 echo mount[637]: mount.nfs: Failed to resolve server nfsd.domain.tld: System error
Sep 20 09:33:52 echo systemd[1]: Dependency failed for Remote File Systems.
Sep 20 09:33:52 echo systemd[1]: music.mount mount process exited, code=exited status=32
Sep 20 09:33:52 echo systemd[1]: Failed to mount /music.

Comment 1 Fedora End Of Life 2015-01-09 19:54:26 UTC
This message is a notice that Fedora 19 is now at end of life. Fedora 
has stopped maintaining and issuing updates for Fedora 19. It is 
Fedora's policy to close all bug reports from releases that are no 
longer maintained. Approximately 4 (four) weeks from now this bug will
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Comment 2 Fedora End Of Life 2015-02-17 17:15:57 UTC
Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

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