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From: Darryl Ross (darryl_at_e-consortium.com.au)
Date: Thu 31 Jul 2003 - 07:31:08 BST


Dan,

> Have you tried turning off root squashing?

I already have no_squash_root set.

Regards
Darryl

> Dan
>
> On Fri, 2003-07-25 at 00:48, Darryl Ross wrote:
> > Hey All,
> >
> > Have been lurking for a while, but this is a first post.
> >
> > I'm building a new data centre for my employer, and having used vserver
> > on my own hardware we decided to use it as a solution in the new data
> > centre.
> >
> > The basic setup is I have two machines which are acting as file servers
> > (600Gb each) which are mirrored using drbd and do fail-over using
> > heartbeat. They export a file system using NFS. On top of that I have 4
> > machines which are the vserver application servers.
> >
> > What I would like to be able to do is run /vservers and /etc/vservers
> > from NFS. This would make it easy to 'move' a virtual server from one
> > application server to another with only the downtime required for a
> > 'vserver vs stop' and then 'vserver vs start'. This would make it easier
> > to cope with hardware failures on the application servers and also means
> > that I can quite easily load balance the virtual servers across the
> > hardware.
> >
> > Now, my problem is that when I try to start a vserver which is stored on
> > NFS I get the following results:
> >
> >
> > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> >
> > [root_at_apps4 root]# cat /etc/vservers/radius2.conf
> > IPROOT="202.6.141.2"
> > IPROOTDEV=eth0
> > ONBOOT=no
> > S_HOSTNAME=radius2.e-access.com.au
> > S_DOMAINNAME=
> > S_NICE=5
> > S_FLAGS="lock nproc sched"
> > ULIMIT="-H -u 1000"
> > S_CAPS="CAP_NET_ADMIN CAP_SYS_CHROOT CAP_NET_BIND_SERVICE"
> >
> > [root_at_apps4 root]# mount
> > /dev/md1 on / type ext3 (rw)
> > none on /proc type proc (rw)
> > /dev/md0 on /boot type ext3 (rw)
> > none on /dev/pts type devpts (rw,gid=5,mode=620)
> > none on /dev/shm type tmpfs (rw)
> > 172.30.0.100:/mnt/data/vservers/conf on /etc/vservers type nfs
> > (rw,addr=172.30.0.100)
> > 172.30.0.100:/mnt/data/vservers/actual on /vservers type nfs
> > (rw,addr=172.30.0.100)
> >
> > [root_at_apps4 root]# vserver radius2 start
> > Starting the virtual server radius2
> > Server radius2 is not running
> > ipv4root is now 202.6.141.2
> > Host name is now radius2.e-access.com.au
> > New security context is 11
> > Can't chroot to directory . (Permission denied)
> >
> > [root_at_apps4 root]# mount
> > /dev/md1 on / type ext3 (rw)
> > none on /proc type proc (rw)
> > /dev/md0 on /boot type ext3 (rw)
> > none on /dev/pts type devpts (rw,gid=5,mode=620)
> > none on /dev/shm type tmpfs (rw)
> > 172.30.0.100:/mnt/data/vservers/conf on /etc/vservers type nfs
> > (rw,addr=172.30.0.100)
> > 172.30.0.100:/mnt/data/vservers/actual on /vservers type nfs
> > (rw,addr=172.30.0.100)
> > none on /vservers/radius2/proc type proc (rw)
> > none on /vservers/radius2/dev/pts type devpts (rw)
> >
> >
> > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> >
> > I have done a google for this error, and the only references I can turn
> > up are to do with the permissions on /vservers. The permission denied
> > error occurs whether or not /vservers is mode 000 or mode 755
> > (root:root). Additionally, /proc and /dev/pts within the virtual server
> > are mounted afterwards and the IP alias is also active.
> >
> > The application servers are running:
> > - Redhat 9.0 (with updates)
> > - vserver 0.22 (I also tried 0.23 with no difference)
> > - kernel 2.4.21ctx-17 (from the website)
> >
> > What I would like is if there is some way I can store /vservers on my
> > file servers and remote mount them. have tried NFS, I don't think Samba
> > will work and I looked at Coda, but that also had problems (you have to
> > authenticate to get a kerberos token each session).
> >
> >
> > Does anyone know how I can get NFS working, or if there is some other
> > way to remote mount /vservers and get it to work?
> >
> > TIA
> > Darryl
>


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