Server Software Update : September 2021
What's happening and why
I'm planning to upgrade all the server software this month. Nothing sinister,
just installing latest operating system version to enable me to keep up with
security updates in the future. If it means anything to you, going from Debian
Linux Version 10 to Version 11 which was released last month.
How I'm going to do it
The safest way to do this is to start up a second server and move sites and
mailboxes one at a time, checking each move is successful before starting the
So on September 10th I'll be starting up a new server to replace the existing one.
From September 12 onwards I'll be migrating sites one by one to the new
server, dealing with any glitches as they occur. I'm allowing two weeks for
the process but it shouldn't take anything like that long if all goes well.
Impact on Customer Sites and Email
Some time after 6pm on Saturday September 11th or on Sunday September 12th,
you may notice a brief period when your web site appears to be down or your
email service (if provided by me) is inaccessible. This is because I'll be
moving the primary name server to the new machine before migrating any customer
At some point after that, maybe during the next week, the following things
- I'll email you to say your site/mailbox is about to be moved
- There will be some downtime, varying from a couple of minutes to half
an hour or so while files are moved and DNS changes propagate though the
- I'll email you again when your move is complete
Impact on sites being used commercially
Where I know that your web site or email service is being used for commercial
purposes during the working day, I'll schedule your migration for a time out
of office hours (late evening or Sunday).
If you have any questions or special requirements about the timing of your
move, please contact me using details below.
6 September, 2021