Bug 701309
| Summary: | rpc_pipefs is not re-mounted properly when using nfs root. | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Ondrej Valousek <ondrejv> |
| Component: | dracut | Assignee: | Harald Hoyer <harald> |
| Status: | CLOSED ERRATA | QA Contact: | Release Test Team <release-test-team-automation> |
| Severity: | low | Docs Contact: | |
| Priority: | medium | ||
| Version: | 6.0 | CC: | atodorov, pknirsch, rwilliam |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: |
If the system was booted with root on NFS and a separate /var partition, the rpc pipefs was not accessible anymore. The dracut initramfs mounted the rpc pipefs on /var/lib/nfs/rpc_pipefs and the system later on mounts the /var partition over /var, making the original not accessible anymore. The dracut initramfs now mounts entries in /etc/fstab.sys, which provides a way for the administrator to mount /var on the root filesystem before /var/lib/nfs/rpc_pipefs is mounted.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-12-06 16:45:44 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
Ondrej Valousek
2011-05-02 14:37:55 UTC
(In reply to comment #0) > Strangely enough, it "looks and feels" that it is mounted: > > [root@data ~]# mount | grep rpc > sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime) Please check with "/proc/mounts" or "/proc/self/mountinfo" ... "/etc/mtab" could be out of sync. They are: [root@data ~]# cat /proc/mounts | grep rpc sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0 [root@data ~]# cat /etc/mtab | grep rpc sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0 [root@data ~]# cat /proc/self/mounts | grep rpc sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0 [root@data ~]# cat /proc/self/mountinfo | grep rpc 22 24 0:18 / /var/lib/nfs/rpc_pipefs rw,relatime - rpc_pipefs sunrpc rw Looks like I am facing a bug similar to #583351 - can we get an updated dracut into RHEL-6 as well? This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
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If the system was booted with root on NFS and a separate /var partition, the rpc pipefs was not accessible anymore. The dracut initramfs mounted the rpc pipefs on /var/lib/nfs/rpc_pipefs and the system later on mounts the /var partition over /var, making the original not accessible anymore. The dracut initramfs now mounts entries in /etc/fstab.sys, which provides a way for the administrator to mount /var on the root filesystem before /var/lib/nfs/rpc_pipefs is mounted.
Ok I agree this is not a problem with dracut but rather with /etc/rc.d/rc.sysinit. I have filed a new bug 747552 against the initscripts. Setup procedure with KVM guest: 1) Prepare guest with 2 disk images 2) Make /boot, swap and /var on the first disk 3) Make / on the second disk 4) Install dracut-network package and re-create initrd so that it includes the necessary nfs dracut modules 5) Edit grub.conf and add an entry for boot with NFS root using the new initrd and specify root=nfs4:IPADDR:/share 6) Edit /etc/fstab and remove the line for /. 7) Power off the guest and remove the second disk (where / is) 8) Mount the root partition from 2nd disk on the host and export via NFS - This gives us a ready to go nfsroot (e.g. use kpartx if the disk image is a file). /mnt/root *(sync,rw,no_root_squash) 9) Boot the virtual guest (now having only one local disk) and select the boot entry which mounts / over nfs. 10) When booted inspect /var/lib/nfs/rpc_pipefs. (In reply to comment #11) > 6) Edit /etc/fstab and remove the line for /. Don't remove but edit like so: nfs:10.10.9.126:/mnt/root / ext4 defaults 0 0 Also in /etc/sysconfig/network-scripts/ifcfg-eth0 set: ONBOOT=no Then I see at several places: effective UID is -2 (16,47,35) harald: " effective UID is -2" that's _the_ bug :) Next step: 1) Upgraded to latest packages in snap #4 2) Created /etc/fstab.sys file to mount /var 3) Recreated the initramfs 4) Boot into runlevel 1 On the console I see: dracut: Mounted root filesystem 10.10.9.126:/mnt/root/ dracut: Mounting from /sysroot/etc/fstab.sys EXT4-fs (vda3): recovery complete EXT4-fs (vda3): mounted filesystem with ordered data mode. Opts: dracut: /dev/vda3 on /sysroot/var type ext4 (rw) Later: # ls -l /var/lib/nfs/rpc_pipefs/ total 0 dr-xr-xr-x. 3 root root 0 Nov 3 11:36 cache dr-xr-xr-x. 2 root root 0 Nov 3 11:36 lockd dr-xr-xr-x. 2 root root 0 Nov 3 11:36 mount dr-xr-xr-x. 4 root root 0 Nov 3 11:36 nfs dr-xr-xr-x. 2 root root 0 Nov 3 11:36 nfsd4_cb dr-xr-xr-x. 2 root root 0 Nov 3 11:36 portmap dr-xr-xr-x. 2 root root 0 Nov 3 11:36 statd According to Harald this indicated that the dracut bug is fixed. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2011-1521.html |