On Wed, 28 Jan 2009, Ian Kent wrote:
>> The question is this: WHAT is going on with the autofs startup that
>> requires me to first end up in location outside of it before it will work?
>> Thinking it might be a race, I started experimenting with sleep calls to
>> give autofs a chance to initialize before trying to move into it. No
>> dice. Whether I wait 2 seconds or a minute, the results were the same.
>>
>> The schroot maintainer is mildly convinced that there must be an easier
>> way to get automount working in the chroot and I tend to agree. Does
>> anyone have any advice?
>
> Collect some debug logs of the different things you've tried and we'll
> see if we can work out what is happening. Versions or autofs and kernel
> could be useful.
Autofs: 4.1.4+debian-2.1ubuntu1
Kernel: 2.6.24-23-generic
auto.master:
#
# $Id: auto.master,v 1.4 2005/01/04 14:36:54 raven Exp $
#
# Sample auto.master file
# This is an automounter map and it has the following format
# key [ -mount-options-separated-by-comma ] location
# For details of the format look at autofs(5).
#/misc /etc/auto.misc --timeout=60
#/smb /etc/auto.smb
#/misc /etc/auto.misc
/net /etc/auto.net --debug -intr
auto.net:
pii -rsize=65536,wsize=65536,tcp,noatime pii.fast.net:/
src -rsize=65536,wsize=65536,tcp,noatime pii.fast.net:/ips_src
ips -rsize=65536,wsize=65536,tcp,noatime pii.fast.net:/ips
home -rsize=65536,wsize=65536,tcp pii.fast.net:/ips_home/home
dosD -rsize=65536,wsize=65536,tcp,noatime pii.fast.net:/ips_dos/dos
/etc/nsswitch.conf:
# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed,
try:
# `info libc "Name Service Switch"' for information about this file.
passwd: compat
group: compat
shadow: compat
hosts: files dns
networks: files
protocols: db files
services: db files
ethers: db files
rpc: db files
netgroup: nis
Here are the debugging traces:
Note: If I simply try to bind-mount the root environment's /net directory
into the chroot tree, there is nothing in the log file. Autofs simply
does not see it. I can only assume that the Linux VFS does not support
bind mounting of automounter directories.
All the following involve an init script that starts a second automount
deamon inside the chroot environment:
1. If I create /net beforehand and attempt to log directly to a home
directory in NFS at start of the chroot'ed session:
Feb 1 11:07:21 duo automount[23853]: starting automounter version 4.1.4, path
= /net, maptype = file, mapname = /etc/aut
Feb 1 11:07:21 duo automount[23853]: parse(sun): init gathered options: intr
Feb 1 11:07:21 duo automount[23853]: mount(bind): bind_works = 1
Feb 1 11:07:21 duo automount[23853]: using kernel protocol version 4.00
Feb 1 11:07:21 duo automount[23853]: using timeout 300 seconds; freq 75 secs
Feb 1 11:07:21 duo automount[23853]: sig 12 switching from 1 to 5
Feb 1 11:07:21 duo automount[23853]: get_pkt: state 1, next 5
Feb 1 11:07:21 duo automount[23853]: prep_shutdown: state = 1
Feb 1 11:07:21 duo automount[23853]: signal_children: send 12 to process group
23853
Feb 1 11:07:21 duo automount[23853]: expire_proc: exp_proc=23872
Feb 1 11:07:21 duo automount[23853]: prep_shutdown: expire returns 1
Feb 1 11:07:21 duo automount[23853]: handle_child: got pid 23872, sig 0 (0),
stat 0
Feb 1 11:07:21 duo automount[23853]: sigchld: exp 23872 finished, switching
from 5 to 6
Feb 1 11:07:21 duo automount[23853]: get_pkt: state 5, next 6
Feb 1 11:07:21 duo automount[23853]: umount_multi: path=/net incl=0
Feb 1 11:07:21 duo automount[23853]: umount_multi: no mounts found under /net
Feb 1 11:07:21 duo automount[23853]: shut down, path = /net
2. If I do not create /net beforehand and try to log directly to home:
Feb 1 11:09:01 duo automount[24610]: starting automounter version 4.1.4, path
= /net, maptype = file, mapname = /etc/auto.net
Feb 1 11:09:01 duo automount[24610]: parse(sun): init gathered options: intr
Feb 1 11:09:01 duo automount[24610]: mount(bind): bind_works = 1
Feb 1 11:09:01 duo automount[24610]: failed to create iautofs directory /net
Feb 1 11:09:01 duo automount[24610]: /net: mount failed!
3. If I create /net beforehand and log to a local filesystem initially at
start of the chroot'ed session:
Feb 1 11:11:14 duo automount[25830]: starting automounter version 4.1.4, path
= /net, maptype = file, mapname = /etc/auto.net
Feb 1 11:11:14 duo automount[25830]: parse(sun): init gathered options: intr
Feb 1 11:11:14 duo automount[25830]: mount(bind): bind_works = 1
Feb 1 11:11:14 duo automount[25830]: using kernel protocol version 4.00
Feb 1 11:11:14 duo automount[25830]: using timeout 300 seconds; freq 75 secs
Feb 1 11:11:14 duo automount[25830]: handle_packet: type = 0
Feb 1 11:11:14 duo automount[25830]: handle_packet_missing: token 35, name
home
Feb 1 11:11:14 duo automount[25830]: attempting to mount entry /net/home
Feb 1 11:11:14 duo automount[25835]: lookup(file): home ->
-rsize=65536,wsize=65536,tcp pii.fast.net:/ips_home/home
Feb 1 11:11:14 duo automount[25835]: parse(sun): expanded entry:
-rsize=65536,wsize=65536,tcp pii.fast.net:/ips_home/home
Feb 1 11:11:14 duo automount[25835]: parse(sun):
dequote("rsize=65536,wsize=65536,tcp") -> rsize=65536,wsize=65536,tcp
Feb 1 11:11:14 duo automount[25835]: parse(sun): gathered options:
intr,rsize=65536,wsize=65536,tcp
Feb 1 11:11:14 duo automount[25835]: parse(sun):
dequote("pii.fast.net:/ips_home/home") -> pii.fast.net:/ips_home/home
Feb 1 11:11:14 duo automount[25835]: parse(sun): core of entry:
options=intr,rsize=65536,wsize=65536,tcp, loc=pii.fast.net:/ips_home/home
Feb 1 11:11:14 duo automount[25835]: parse(sun): mounting root /net,
mountpoint home, what pii.fast.net:/ips_home/home, fstype nfs, options
intr,rsize=65536,wsize=65536,tcp
Feb 1 11:11:14 duo automount[25835]: mount(nfs): root=/net name=home
what=pii.fast.net:/ips_home/home, fstype=nfs,
options=intr,rsize=65536,wsize=65536,tcp
Feb 1 11:11:14 duo automount[25835]: mount(nfs): nfs
options="intr,rsize=65536,wsize=65536,tcp", nosymlink=0, symlink=0, ro=0
Feb 1 11:11:14 duo automount[25835]: mount(nfs): is_local_mount:
pii.fast.net:/ips_home/home
Feb 1 11:11:14 duo automount[25835]: mount(nfs): from
pii.fast.net:/ips_home/home elected pii.fast.net:/ips_home/home
Feb 1 11:11:14 duo automount[25835]: mount(nfs): calling mkdir_path /net/home
Feb 1 11:11:14 duo automount[25835]: mount(nfs): calling mount -t nfs -s -o
intr,rsize=65536,wsize=65536,tcp pii.fast.net:/ips_home/home /net/home
Feb 1 11:11:14 duo automount[25835]: mount(nfs): mounted
pii.fast.net:/ips_home/home on /net/home
Feb 1 11:11:14 duo automount[25830]: handle_child: got pid 25835, sig 0 (0),
stat 0
Feb 1 11:11:14 duo automount[25830]: sig_child: found pending iop pid 25835:
signalled 0 (sig 0), exit status 0
Feb 1 11:11:14 duo automount[25830]: send_ready: token=35
!! ====> Now I have an accessible home directory and can cd into it.
Please let me know if more information is needed?
Steve
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