Include instructions for Portainer

docs/u_and_e.md

@@ -465,6 +465,61 @@ For Firefox you will need to install the "U2F Support Add-on" as provided on [mo
 
 U2F works without an internet connection.
 
+## Portainer
+
+In order to enable Portainer, the docker-compose.yml and site.conf for nginx must be modified.
+
+1\. docker-compose.yml: Insert this block for portainer
+```
+    portainer-mailcow:
+      image: portainer/portainer
+      volumes:
+        - /var/run/docker.sock:/var/run/docker.sock
+      restart: always
+      dns:
+        - 172.22.1.254
+      dns_search: mailcow-network
+      networks:
+        mailcow-network:
+          aliases:
+            - portainer
+```
+2a\. data/conf/nginx/site.conf: Just beneath the opening line, at the same level as a server { block, add this:
+```
+upstream portainer {
+  server portainer-mailcow:9000;
+}
+
+map $http_upgrade $connection_upgrade {
+  default upgrade;
+  '' close;
+}
+```
+
+2b\. data/conf/nginx/site.conf: Then, inside **both** (ssl and plain) server blocks, add this:
+```
+  location /portainer/ {
+    proxy_http_version 1.1;
+    proxy_set_header Host              $http_host;   # required for docker client's sake
+    proxy_set_header X-Real-IP         $remote_addr; # pass on real client's IP
+    proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_read_timeout                 900;
+
+    proxy_set_header Connection "";
+    proxy_buffers 32 4k;
+    proxy_pass http://portainer/;   }
+
+  location /portainer/api/websocket/ {
+    proxy_http_version 1.1;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection $connection_upgrade;
+    proxy_pass http://portainer/api/websocket/;
+  }
+```
+
+Now you can simply navigate to https://${MAILCOW_HOSTNAME}/portainer/ to view your Portainer container monitoring page. You’ll then be prompted to specify a new password for the **admin** account. After specifying your password, you’ll then be able to connect to the Portainer UI.
+
 ## Why Bind?
 
 For DNS blacklist lookups and DNSSEC.