Add how to migrate SSL certs

server/nginx_webserver/migrate_ssl_certs.md

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+# Migrate SSL Certificated
+https://ivanderevianko.com/2019/03/migrate-letsencrypt-certificates-certbot-to-new-server
+
+## Find the location of Certs
+
+`cat /etc/nginx/sites-available/<site>`
+
+Locate the location of the SSL certificates from there. e.g.
+`ssl_certificate_key /etc/letsencrypt/live/aney.co.uk/privkey.pem;`
+
+Then find the true location of these files (the ones shown are likely symlinks)
+`sudo ls -l /etc/letsencrypt/live/aney.co.uk`
+
+This will potentially show 
+`lrwxrwxrwx 1 root root  34 Aug  1 15:16 cert.pem -> ../../archive/aney.co.uk/cert1.pem`
+
+Which can be translated to
+`/etc/letsencrypt/archive/aney.co.uk/cert1.pem`
+
+You'll also need renewel configs
+`/etc/letsencrypt/renewal/aney.co.uk.conf` 
+
+### Compress the cert files
+
+`sudo tar -chvzf certs.tar.gz /etc/letsencrypt/archive/aney.co.uk /etc/letsencrypt/renewal/aney.co.uk.conf`
+
+Then move it somewhere easy to access. E.g. a home directory, or /root
+
+`mv certs.tar.gz /home/pi/`
+
+### Add certs to the new server
+
+`scp certs.tar.gz nathan@192.168.1.226:/home/nathan`
+
+## Move Certificates
+
+SSH onto the new server
+
+Change into root directory and extract. This will set the correct filepaths
+
+`cd /`
+`sudo tar -xvf ~/certs.tar.gz`
+
+### Symlink the certs to the "live" folder
+
+#### If the directory doesn't exist, add it 
+
+    sudo mkdir /etc/letsencrypt/live /etc/letsencrypt/live/aney.co.uk
+
+#### Actually do the symlinks
+
+    sudo ln -s /etc/letsencrypt/archive/aney.co.uk/cert1.pem /etc/letsencrypt/live/aney.co.uk/cert.pem
+    sudo ln -s /etc/letsencrypt/archive/aney.co.uk/chain1.pem /etc/letsencrypt/live/aney.co.uk/chain.pem
+    sudo ln -s /etc/letsencrypt/archive/aney.co.uk/fullchain1.pem /etc/letsencrypt/live/aney.co.uk/fullchain.pem
+    sudo ln -s /etc/letsencrypt/archive/aney.co.uk/privkey1.pem /etc/letsencrypt/live/aney.co.uk/privkey.pem
+
+
+### Add SSL certificated into the nginx config
+
+` ssl_certificate /etc/letsencrypt/live/aney.co.uk/fullchain.pem; # managed by Certbot
+ ssl_certificate_key /etc/letsencrypt/live/aney.co.uk/privkey.pem; # managed by Certbot`
+
+#### Do it from the other server
+
+`scp /etc/nginx/sites-available/aney nathan@192.168.1.226:/etc/nginx/sites-available/aney_srv`
+
+Rename the existing config if it exists.
+
+`mv aney.co.uk aney.co.uk.PRE-MIGRATE`
+
+Rename the new/existing server's config
+
+`mv aney_srv aney.co.uk`
+
+### Point domain to new server 
+
+Change the A records in your DNS to point towards the new server.
+
+If it's a new replacement/internal server, the IP for the port forward should
+be all that's needed.
+
+### Run a let's encrypt dry-run
+
+`sudo letsencrypt renew --dry-run`