Create update_docker.md

docs/docs/update_docker.md

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+# Updating the RMM (Docker)
+
+#### Updating to the latest RMM version
+
+Tactical RMM updates the docker images on every release and should be available within a few minutes
+
+SSH into your server as a root user and run the below commands:<br/>
+```bash
+cd [dir/with/compose/file]
+mv docker-compose.yml docker-compose.yml.old
+wget https://raw.githubusercontent.com/wh1te909/tacticalrmm/master/docker/docker-compose.yml
+sudo docker-compose pull
+sudo docker-compose down
+sudo docker-compose up -d --remove-orphans
+```
+
+#### Keeping your Let's Encrypt certificate up to date
+
+To renew your Let's Encrypt wildcard cert, run the following command, replacing `example.com` with your domain and `admin@example.com` with your email:
+
+```bash
+sudo certbot certonly --manual -d *.example.com --agree-tos --no-bootstrap --manual-public-ip-logging-ok --preferred-challenges dns -m admin@example.com --no-eff-email
+```
+
+Verify the domain with the TXT record. Once issued, run the below commands to base64 encode the certificates and add then to the .env file
+
+```bash
+echo "CERT_PUB_KEY=$(sudo base64 -w 0 /etc/letsencrypt/live/${rootdomain}/fullchain.pem)" >> .env
+echo "CERT_PRIV_KEY=$(sudo base64 -w 0 /etc/letsencrypt/live/${rootdomain}/privkey.pem)" >> .env
+```
+
+!!!warning You must remove the old and any duplicate entries for CERT_PUB_KEY and CERT_PRIV_KEY in the .env file
+
+Now run `sudo docker-compose restart` and the new certificate will be in effect