Add server migration checklist.

This document lists the numerous steps required to make an orderly
migration from one server to another.

Detailed reference documentation for how to perform these steps is, of
course, still needed.

deploy/MIGRATION-CHECKLIST.md

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+Server migration checklist
+==========================
+
+[ ] **Target**: Check network (reachable, link speed)
+[ ] **Target**: Check disk (enough space, no RAID problems)
+[ ] **Target**: Pre-synchronize files
+[ ] **DNS**: Set minimum TTL
+[ ] **Target**: Check/upgrade system packages
+[ ] **Target**: Update `/physionet/physionet-build.git`
+[ ] **Target**: Update `/physionet/.env`
+[ ] **Target**: Update system config files
+[ ] **Target**: Enable `SYSTEM_MAINTENANCE_NO_CHANGES`
+[ ] **Source**: Dump and transfer database
+[ ] **Target**: Restore database (reload uwsgi)
+[ ] **Target**: Test nginx/uwsgi is working
+[ ] **Target**: Update `/etc/aliases`
+[ ] **Target**: Update certificates
+[ ] **Target**: Test postfix is working
+[ ] **Target**: Test haproxy is working
+[ ] **Target**: Configure iptables
+[ ] **Target**: Configure qdisc
+
+[ ] (proxy-backward) **Target**: Redirect connections to haproxy
+[ ] (proxy-backward) **DNS**: Update records
+
+[ ] **Target**: Stop background-tasks daemon
+[ ] **Source**: Stop background-tasks daemon
+[ ] **Source**: Enable `SYSTEM_MAINTENANCE_NO_UPLOAD` (reload uwsgi)
+[ ] **Target**: Synchronize files
+[ ] **Source**: Enable `SYSTEM_MAINTENANCE_NO_CHANGES` (reload uwsgi)
+[ ] **Source**: Dump and transfer database
+[ ] **Target**: Restore database (reload uwsgi)
+[ ] **Target**: Check new content is visible
+
+[ ] (proxy-forward) **Source**: Redirect connections to haproxy
+[ ] (proxy-forward) **DNS**: Update records
+
+[ ] **Target**: Disable `SYSTEM_MAINTENANCE_NO_CHANGES` (reload uwsgi)
+[ ] **Target**: Remove iptables redirections
+[ ] **Target**: Start background-tasks daemon
+[ ] **DNS**: Set normal TTL