Better formatting and adding systemd config to run Minio server on custom port. (#3113)

dist/linux-systemd/distributed/README.md

@@ -1,40 +1,50 @@
 
 - Systemd script is configured to run the binary from /usr/share/minio/bin/.
-
-  `$ mkdir -p /usr/share/minio/bin/`
+  ```sh
+  $ mkdir -p /usr/share/minio/bin/
+  ```
 
 - Download the binary. Find the relevant links for the binary at https://minio.io/downloads/#minio-server.
-
-  `$ wget -O /usr/share/minio/bin/minio https://dl.minio.io/server/minio/release/linux-amd64/minio`
+  ```sh
+  $ wget -O /usr/share/minio/bin/minio https://dl.minio.io/server/minio/release/linux-amd64/minio
+  ```
 
 - Give execute permission to the Minio binary. 
-
-  `$ chmod +x /usr/share/minio/bin/minio`
+  ```sh
+  $ chmod +x /usr/share/minio/bin/minio
+  ```
 
 - Create user minio. Systemd is configured with User=minio . 
-
-  `$ useradd minio`
+  ```sh
+  $ useradd minio
+  ```
   
 - Create the Environment configuration file. 
-
-  `$ cat <<EOT >> /etc/default/minio.conf`
+  ```sh
+  $ cat <<EOT >> /etc/default/minio.conf
+  ```
 
   ```
+   # Remote node configuration. 
    MINIO_VOLUMES=node1:/tmp/drive1 node2:/drive1 node3:/tmp/drive1 minio4:/tmp/drive1
-   
+   # Use if you want to run Minio on a custom port.
+   MINIO_OPTS="--address :9199" 
+   # Acess Key of the server.
    MINIO_ACCESS_KEY=Server-Access-Key
-   
+   # Secret key of the server. 
    MINIO_SECRET_KEY=Server-Secret-Key
    
    EOT
    ```
+
 - Download and put `minio.service` in  `/etc/systemd/system/`
-
-  `$ ( cd /etc/systemd/system/; curl -O https://raw.githubusercontent.com/minio/minio/master/dist/linux-systemd/distributed/minio.service )`
-
+  ```sh
+  $ ( cd /etc/systemd/system/; curl -O https://raw.githubusercontent.com/minio/minio/master/dist/linux-systemd/distributed/minio.service )
+  ```
 - Enable startup on boot.
-
-  `$ systemctl enable minio.service`
+  ```sh
+  $ systemctl enable minio.service
+  ```