anyone used director failover in production?
matthew at crocker.com
Fri May 24 14:32:54 BST 2002
Well, We use QMAIL-LDAP for our mail server and Courier-IMAP for the
IMAP server. QMAIL saves mail in Maildir format on our NFS server
(Network Appliance F720) as a single qmailu user. All aliases,
passwords, mail quota information is stored in LDAP (openldap.org). The
cluster is load balanced using LVS currently with Direct Routing but I'm
going to switch to NAT very soon.
On Thu, 2002-05-23 at 21:41, xiongqiuhua wrote:
> hi,I am making preparations for a lvs handling mail server .
> can anyone who have the experience introduce something about it to me?
> I have a production LVS server running with 3 real servers handling
> SMTP, POP3, IMAP for our QMAIL server. We process about a million
> inbound connections a day. I've never had the primary LVS server crash
> but I have shut it down on purpose (yanked the power cord) to test the
> fail over. Everything worked perfectly.
> [root at lvsd-1 /root]# uname -a
> Linux lvsd-1.crocker.com 2.4.9 #1 Tue Aug 28 11:42:10 EDT 2001 i686
> [root at lvsd-1 /root]# uptime
> 5:27am up 71 days, 16:47, 1 user, load average: 1.06, 1.03, 1.00
> [root at lvsd-1 /root]# /sbin/ipvsadm -L
> IP Virtual Server version 0.9.3 (size=65536)
> Prot LocalAddress:Port Scheduler Flags
> -> RemoteAddress:Port Forward Weight ActiveConn InActConn
> TCP mail.crocker.com:smtp lc
> -> cw-3-e0.crocker.com:smtp Route 1 79 194
> -> cw-1-e0.crocker.com:smtp Route 1 78 228
> -> cw-2-e0.crocker.com:smtp Route 1 81 116
> TCP mail.crocker.com:pop3 lc
> -> cw-1-e0.crocker.com:pop3 Route 1 2 42
> -> cw-3-e0.crocker.com:pop3 Route 1 1 45
> -> cw-2-e0.crocker.com:pop3 Route 1 1 44
> TCP mail.crocker.com:imap2 lc
> -> cw-1-e0.crocker.com:imap2 Route 1 3 2
> -> cw-3-e0.crocker.com:imap2 Route 1 2 3
> -> cw-2-e0.crocker.com:imap2 Route 1 3 1
> On Thu, 2002-05-23 at 06:58, Joseph Mack wrote:
> >> From what I can tell (small number of anecdotes), director
> >> failover is mainly used for planned maintenance and so that
> >> management can tell customers that their setup has redundancy.
> >> I haven't heard any stories of failover working in production.
> >> Does anyone have director failover in a production setup, when
> >> directors have failed and changed over automatically and you've
> >> only found out about it when the failover mechanism notified
> >> you (rather than the customers notifying you)?
> >> If so, I'd like to put the info into the HOWTO. Please let
> >> me know what failed, what system you're using for failover,
> >> and anything else of interest.
> >> Thanks Joe
> >> --
> >> Joseph Mack PhD, Senior Systems Engineer, Lockheed Martin
> >> contractor to the National Environmental Supercomputer Center,
> >> mailto:mack.joseph at epa.gov ph# 919-541-0007, RTP, NC, USA
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