[Bug 1590799] Re: nfs-kernel-server does not start because of dependency failure
Rafael David Tinoco
rafael.tinoco at canonical.com
Fri Apr 7 18:21:00 UTC 2017
I have tested both and found no apparent race condition. Since I'm the
second one, I will flag this as verification-done. Paul, the nfs.blkmap
is not in even in the same systemd unit files we are working on.
nfs.blkmap is declared for me in:
nfs-blkmap.service:Requisite=nfs-blkmap.target
nfs-blkmap.service:After=nfs-blkmap.target
nfs-blkmap.service:PIDFile=/var/run/blkmapd.pid
nfs-blkmap.service:ExecStart=/usr/sbin/blkmapd $BLKMAPDARGS
nfs-blkmap.target:Description= PNFS blkmaping enablement.
nfs-blkmap.target:# If this target is enabled, then blkmapd will be started
nfs-client.target:Wants=nfs-blkmap.service
nfs-client.target:After=nfs-blkmap.service
being responsible for blkmapd daemon (for pNFS).
blkmapd can be (re)started through nfs-utils.service if blkmapd.target
is enabled. It can also be started by nfs-client.target, if
blkmapd.target is enabled.
[ 3.131507] systemd[1]: nfs-blkmap.service: Job nfs-blkmap.service/start
failed with result 'dependency'.
This looks like a leftover from some other tasks/cmds you made. If you
think its needed, this should be handled in another bug (specially
because its unrelated to the race itself AND this bug is already in
verification phase).
I'm marking this as verification done.
** Tags removed: verification-needed
** Tags added: verification-done
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https://bugs.launchpad.net/bugs/1590799
Title:
nfs-kernel-server does not start because of dependency failure
Status in nfs-utils package in Ubuntu:
Fix Released
Status in nfs-utils source package in Trusty:
Invalid
Status in nfs-utils source package in Xenial:
Fix Committed
Status in nfs-utils source package in Yakkety:
Fix Committed
Status in nfs-utils source package in Zesty:
Fix Released
Bug description:
[Impact]
* nfs-mountd doesn't get started because of a race condition happening when rpcbind.socket is not specified as a needed service for it to start.
* nfs-server using rpcbind.target instead of using rpcbind.socket. Target should not be used (Comment #24)
[Test Case]
* Install nfs-kernel-server inside a xenial lxc guest and restart it until nfs-mountd doesn't start complaining on rpc error.
* Comment #25
[Regression Potential]
* Cons: Systemd dependencies could brake for nfs-server and nfs-mountd.
* Pros: Patches have been accepted upstream (and tested).
[Other Info]
# Original Bug Description
Immediately after boot:
root at feynmann:~# systemctl status nfs-kernel-server
● nfs-server.service - NFS server and services
Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
Active: inactive (dead)
Jun 09 14:35:47 feynmann systemd[1]: Dependency failed for NFS server and services.
Jun 09 14:35:47 feynmann systemd[1]: nfs-server.service: Job nfs-server.service/start failed
root at feynmann:~# systemctl status nfs-mountd.service
● nfs-mountd.service - NFS Mount Daemon
Loaded: loaded (/lib/systemd/system/nfs-mountd.service; static; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2016-06-09 14:35:47 BST; 7min ago
Process: 1321 ExecStart=/usr/sbin/rpc.mountd $RPCMOUNTDARGS (code=exited, status=1/FAILURE)
Jun 09 14:35:47 feynmann systemd[1]: Starting NFS Mount Daemon...
Jun 09 14:35:47 feynmann rpc.mountd[1321]: mountd: could not create listeners
Jun 09 14:35:47 feynmann systemd[1]: nfs-mountd.service: Control process exited, code=exited
Jun 09 14:35:47 feynmann systemd[1]: Failed to start NFS Mount Daemon.
Jun 09 14:35:47 feynmann systemd[1]: nfs-mountd.service: Unit entered failed state.
Jun 09 14:35:47 feynmann systemd[1]: nfs-mountd.service: Failed with result 'exit-code'.
root at feynmann:~# systemctl list-dependencies nfs-kernel-server
nfs-kernel-server.service
● ├─auth-rpcgss-module.service
● ├─nfs-config.service
● ├─nfs-idmapd.service
● ├─nfs-mountd.service
● ├─proc-fs-nfsd.mount
● ├─rpc-svcgssd.service
● ├─system.slice
● ├─network.target
● └─rpcbind.target
● └─rpcbind.service
root at feynmann:~# systemctl list-dependencies nfs-mountd.service
nfs-mountd.service
● ├─nfs-config.service
● ├─nfs-server.service
● ├─proc-fs-nfsd.mount
● └─system.slice
root at feynmann:~#
root at feynmann:~# lsb_release -rd
Description: Ubuntu 16.04 LTS
Release: 16.04
root at feynmann:~# apt-cache policy nfs-kernel-server
nfs-kernel-server:
Installed: 1:1.2.8-9ubuntu12
Candidate: 1:1.2.8-9ubuntu12
Version table:
*** 1:1.2.8-9ubuntu12 500
500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
Additional comments:
1. There seems to be a circular dependency between nfs-mountd and nfs-kernel-server
2. I can get it working by changing the AFter,Requires in /lib/ssystemd/system/nfs-{mountd|server}.service files. I have managed to get nfs-kernel-server to start but not nfs-mountd.
3. /usr/lib/systemd/scripts/nfs-utils_env.sh references /etc/sysconfig/nfs which is Centos/RedHat location of this file. Also /etc/default/nfs does not exist. (possibly unrelated to this bug)
4. A file "/lib/systemd/system/-.slice" exists. this file prevents execution of 'ls *' or 'grep xxx *' commands in that directory. I am unsure whether this is intended by the systemd developers but it is unfriendly when investigating this bug.
Attempted solution:
1. Edit /lib/systemd/system/nfs-server.service (original lines are
commented out:
[Unit]
Description=NFS server and services
DefaultDependencies=no
Requires=network.target proc-fs-nfsd.mount rpcbind.target
# Requires=nfs-mountd.service
Wants=nfs-idmapd.service
After=local-fs.target
#After=network.target proc-fs-nfsd.mount rpcbind.target nfs-mountd.service
After=network.target proc-fs-nfsd.mount rpcbind.target
After=nfs-idmapd.service rpc-statd.service
#Before=rpc-statd-notify.service
Before=nfs-mountd.service rpc-statd-notify.service
...
followed by a systemctl daemon-reload and a reboot.
This results in nfs-kernel-server starting correctly but nfs-mountd
not so. However starting nfs-mountd manually after reboot is
successful:
root at feynmann:~# systemctl status nfs-kernel-server.service
● nfs-server.service - NFS server and services
Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
Active: active (exited) since Thu 2016-06-09 15:07:23 BST; 1min 25s ago
Process: 1391 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS)
Process: 1384 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
Main PID: 1391 (code=exited, status=0/SUCCESS)
Tasks: 0
Memory: 0B
CPU: 0
CGroup: /system.slice/nfs-server.service
Jun 09 15:07:23 feynmann systemd[1]: Starting NFS server and services...
Jun 09 15:07:23 feynmann systemd[1]: Started NFS server and services.
root at feynmann:~# systemctl status nfs-mountd.service
● nfs-mountd.service - NFS Mount Daemon
Loaded: loaded (/lib/systemd/system/nfs-mountd.service; static; vendor preset: enabled)
Active: inactive (dead)
root at feynmann:~# systemctl start nfs-mountd.service
root at feynmann:~# systemctl status nfs-mountd.service
● nfs-mountd.service - NFS Mount Daemon
Loaded: loaded (/lib/systemd/system/nfs-mountd.service; static; vendor preset: enabled)
Active: active (running) since Thu 2016-06-09 15:09:02 BST; 3s ago
Process: 2044 ExecStart=/usr/sbin/rpc.mountd $RPCMOUNTDARGS (code=exited, status=0/SUCCESS)
Main PID: 2046 (rpc.mountd)
Tasks: 1
Memory: 904.0K
CPU: 12ms
CGroup: /system.slice/nfs-mountd.service
└─2046 /usr/sbin/rpc.mountd --manage-gids
Jun 09 15:09:02 feynmann systemd[1]: Starting NFS Mount Daemon...
Jun 09 15:09:02 feynmann rpc.mountd[2046]: Version 1.2.8 starting
Jun 09 15:09:02 feynmann systemd[1]: Started NFS Mount Daemon.
Enabling nfs-mountd.service (systemctl enable nfs-mountd.service) has
no effect in this case.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: nfs-kernel-server 1:1.2.8-9ubuntu12 [modified: lib/systemd/system/nfs-server.service]
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Thu Jun 9 14:38:58 2016
InstallationDate: Installed on 2016-06-08 (1 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
ProcEnviron:
SHELL=/bin/bash
TERM=linux
PATH=(custom, no user)
LANG=en_GB.UTF-8
LANGUAGE=en_GB:en
SourcePackage: nfs-utils
UpgradeStatus: No upgrade log present (probably fresh install)
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