Re: Moving web server to new IP
On 7/26/06, Brent Clark <bclark@eccotours.co.za> wrote:
Simon wrote:
> I need to move our web server to a new IP range. This is hosting
> around 300 websites, about 250 on 2-3 IPS (standard name based virtual
> hosts) and the rest on their own IPs (SSL hosts). All running on
> apache/php/mysql.
Hi
Just a suggestion, start by shortening the TTL, therefore any changes
made will have a more quicker ripple effect.
What I've done, in the past, and am about to do again over the next few
days:
1. install the new webservers and copy over the data
2. put redirects in the config files on the old server such that any
queries to the old servers get sent to the numeric IP addresses of the
new servers
3. cut over the domain records
That way, during the DNS propagation period, queries get routed to the
new servers anyway.
Where it gets a little trickier is when there's backend processing on
the web server, and database consistency is an issue. In that case, it
looks a little more like this (if your application can tolerate a few
minutes of downtime):
1. install new webserver but don't start them
2. stop the old server(s)
3. copy the data, logs, etc.
4. change the DNS records
5. start the new server(s)
6. put a redirect entry on the old server
7. restart the old server
8. wait until you stop getting log entries on the old server, then
decomission
Miles
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