Good noon. Our small startup management decided to move our production server from existing provider to azure.

We have centOS on both. It is for classified's related site, considerable amount of data and ~thousands users with their disc space quota.

This is our first time moving our servers. I need your Guidance and suggestions on these.

1) How to migrate the mysql db (dump OR slave OR copy filesystem)?

2) How to manage the emails during the downtime.

3) Manage the files

4) How to security/Firewall check list for the new system

5) IP/DNS related Checklist

6) Anything that I missed out!.

Since first time, planning to be more cautious.

Any reference documents Highly appreciated.

Thank you all!.