[DRBD-user] drbdlinks useful?

Stefan Seifert nine at detonation.org
Tue Oct 14 11:20:59 CEST 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


I just have a little question about experiences. I'm setting up a fail-over 
cluster for your web- and mail- servers. For example the /etc/postfix of the 
mailserver should be on the shared drbd volume (/shared/mail), so in case of 
a failover, it's available to the other server. This server also has 
an /etc/postfix for it's local mail server, which should be replaced by the 
shared one in case of a failover.

I could now:
* simply always link /etc/postfix to /shared/mail/etc/postfix and have the 
local one automatically hidden by mounting /shared/mail over it. Or
* use drbdlinks to move away /etc/postfix and link it 
to /shared/mail/etc/postfix

I now wonder, what's the better solution. With drbdlinks I could have the 
local config still available for modification even when my mailserver is 
down. But this is at the expense of added complexity to that already very 
complex cluster stuff. Also I could just do a bind mount of / to somewhere 
else if I need to access the local config while /shared/mail is mounted.

So what's the real benefit of drbdlinks? Any practical experience?

Thanks for input!


More information about the drbd-user mailing list