Subject: Re: [vserver] HA vserver in an active/active configuration
From: Christian Balzer <chibi@gol.com>
Date: Wed, 5 Mar 2008 18:58:42 +0900


Hello,

Now that I actually got the hardware und things up and running...

On Sun, 3 Feb 2008 11:43:44 +0100 (CET) Daniel Hokka Zakrisson wrote:

> Christian Balzer wrote:
[stuff about how to deal with the config files]
>
> vserver /path/to/config start is supposed to work. If it doesn't, it's a
> bug that will be fixed.
>
I'm not sure if it's a bug per se, since it works on one half, but not the
other...

First of, I have 2 nodes, and 2 HA controlled filesystems, data-a and
data-b respectively. There is a sub-directory "guests" in both and that in
turn holds an "etc" and a "vservers" one, it should be obvious what they
are. :-p

If I do a "vserver /data-a/guests/etc/engtest04 start" with data-a mounted
on node A, all is fine. On node A /etc/vservers is a symlink
to /data-a/guests/etc/, so that for normal operations (both nodes
up) things work out of the box w/o having to supply the path. 
On node B it's obviously pointing to /data-b/...

However if I fail things over onto node B, this happens:
---
borg00b:~# vserver /data-a/guests/etc/engtest04 start 
save_ctxinfo: symlink("/data-a/guests/etc/engtest04","/etc/vservers/.defaults/run.rev/10001"):
No such file or directory
----
Which is a blatant lie, as /etc/vservers/.defaults/run.rev/ exists very
much and so does of course /data-a/guests/etc/engtest04. 
Any idea what is going on here?

Am I really doomed to rsync the whole configs back and forth all the time?
Anybody with success stories for split vserver configs and vdirbases?

For completeness sake, a ls of that config directory, nothing fancy going
on really:
---
borg00a:~# ls -la /data-a/guests/etc/engtest04/
total 36
drwxr-xr-x 6 root root 4096 2008-03-05 16:29 .
drwxr-xr-x 5 root root 4096 2008-03-05 17:53 ..
drwxr-xr-x 4 root root 4096 2008-03-03 17:02 apps
lrwxrwxrwx 1 root root   43 2008-03-03 17:02 cache -> /etc/vservers/.defaults/cachebase/engtest04
-rw-r--r-- 1 root root    6 2008-03-03 17:02 context
drwxr-xr-x 2 root root 4096 2008-03-03 17:02 cpuset
-rw-r--r-- 1 root root  112 2008-03-03 17:02 fstab
drwxr-xr-x 4 root root 4096 2008-03-03 17:08 interfaces
-rw-r--r-- 1 root root   10 2008-03-03 17:02 name
lrwxrwxrwx 1 root root   27 2008-03-03 17:02 run -> /var/run/vservers/engtest04
drwxr-xr-x 2 root root 4096 2008-03-03 17:02 uts
lrwxrwxrwx 1 root root   33 2008-03-05 16:29 vdir -> /data-a/guests/vservers/engtest04
---

Regards,

Christian
-- 
Christian Balzer        Network/Systems Engineer                NOC
chibi@gol.com   	Global OnLine Japan/Fusion Network Services
http://www.gol.com/