anyone used director failover in production?
mountains_0513 at sina.com
Fri May 24 02:41:50 BST 2002
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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