Hi all,
I'm looking into adding some automatic failover for some services. I'd
like to hear comments / advice on suitability of either CARP / FreeVRRP
/ wackamole + spread for these 2 different setups (see below)
The setups are completelly independent of each other, so different
solutions / approaches for each are OK. Of course, I'm not interested
in adding special hardware to do any of this, but if there are
*significant* advantages of a hardware solution, i'd like to hear too :).
Setup 1) : - FreeBSD 4.11 Server, 3 x NICs (fxp, LAN/WAN/DMZ).
- Firewall (ipf, but thinking of moving to ipfw), ipnat
- about 4 jails (secure FTP, email gateway with antispam, and AV).
- Unmanaged switches used throughout.
- No mysql / DBs.
- email load is low (20 LAN users, but *heavy* users).
The idea is to add another server and be able to gracefully take over
all the functionality with no or very minimum downtime.
For this setup, I was thinking of CARP, but it isn't supported in 4.x?
Setup 2): - 4 x FreeBSD 5.4 Web Servers, 2 NICs (Wan + Private Lan),
utilising a full 100 Mbps link overall. (not sure if important, but each
server also has HP's iLO standard on its own CAT 5, to the same switch).
- Behind Cisco managed switch.
- Apache 2.0, no DB in place.
- Currently on a simple DNS round-robin setup.
- No VRRP running on other switches on this segment of the datacentre,
AFAIK
- How would CARP with arpbalance work on this situation? (would have to
change the DNS to 1 IP,the virtual IP right?) Or is it better to go
wackmole/spread? I had some problems a few years ago with wack/spread on
8 servers running 4.x : if a server went down, another would pick up the
IP..but never release it when the original came back up - never figured
out what the problem was (possibly config?)
thanks in advance for your help & comments,
Beto
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