Thanks to everyone for the feedback. The migration is far from
complete, but at least I have my email running. Here are a few random
things I've learned thus far:
I used Clonezilla to copy my old CentOS 6 install to another disk so I
could keep it as a backup and reference. I thought Clonezilla would
speed up the copy, but apparently it has no deep knowledge of LVM. dd
or ddrescue would likely have been just as fast.
Dropping a UEFI-based disk into a new machine requires telling the UEFI
firmware(aka the BIOS) where to find the boot image.
It's somewhat difficult to find documentation on what all is included in
the various Software Selection options in the CentOS 7 install.
The migration involves changing UID and GID for a few users. Perhaps
unsurprisingly, rsync and GNU tar just do the right thing unless
specifically instructed otherwise.
I was using dovecot-lda for local mail delivery. All the cool kids now
use dovecot LMTP for local delivery. Apparently the cool kids also have
only virtual users, otherwise the Dovecot documentation would tell you
that the following change needs to be made in 10-auth.conf if you have
local users.
#auth_username_format = %Lu
auth_username_format = %n
The Let's Encrypt certbot makes it pretty easy to get SSL certificates
for your postfix and dovecot servers (and of course your web server).
However, you are likely to find some old info on the web describing how
to use tls-sni for the '--preferred-challenges' argument. As of
mid-January, tls-sni is no longer supported, as there was some sort of
fundamental security flaw. If you are currently using tls-sni for
renewals, that still works, but you should check into if or when it will
also be disabled.
Thunderbird defaults to downloading all email, even if you are using
IMAP. I suppose that's a reasonable default, and maybe I knew it at one
time, but that means I had two copies of every email in my home
directory (Maildir plus Thunderbird's storage, 5.7GB + 5.7GB). Now I
know which Thunderbird files need to be deleted to clean things up.
galen
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