dist: Adding systemd script for running Minio distributed. (#3034)

dist/linux-systemd/distributed/README.md

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+
+- Systemd script is configured to run the binary from /usr/share/minio/bin/.
+
+  `$ 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`
+
+- Give execute permission to the Minio binary. 
+
+  `$ chmod +x /usr/share/minio/bin/minio`
+
+- Create user minio. Systemd is configured with User=minio . 
+
+  `$ useradd minio`
+  
+- Create the Environment configuration file. 
+
+  `$ cat <<EOT >> /etc/default/minio.conf`
+  
+  ```
+   MINIO_VOLUMES=node1:/tmp/drive1 node2:/drive1 node3:/tmp/drive1 minio4:/tmp/drive1
+   
+   MINIO_ACCESS_KEY=Server-Access-Key
+   
+   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 )`
+
+- Enable startup on boot.
+
+  `$ systemctl enable minio.service`
+   
+
+  
+  

dist/linux-systemd/distributed/minio.service

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+[Unit]
+Description=Minio
+Documentation=https://docs.minio.io
+Wants=network-online.target
+After=network-online.target
+AssertFileIsExecutable=/usr/share/minio/bin/minio
+
+[Service]
+WorkingDirectory=/usr/share/minio/
+
+User=minio
+Group=minio
+
+PermissionsStartOnly=true
+    
+EnvironmentFile=-/etc/default/minio.conf
+ExecStartPre=/bin/bash -c "[ -n \"${MINIO_VOLUMES}\" ] || echo \"Variable MINIO_VOLUMES not set in /etc/defaults/minio.conf\""
+
+ExecStart=/usr/share/minio/bin/minio server $MINIO_OPTS $MINIO_VOLUMES
+
+StandardOutput=journal
+StandardError=inherit
+
+# Specifies the maximum file descriptor number that can be opened by this process
+LimitNOFILE=65536
+
+# Disable timeout logic and wait until process is stopped
+TimeoutStopSec=0
+
+# SIGTERM signal is used to stop Minio
+KillSignal=SIGTERM
+
+SendSIGKILL=no
+
+SuccessExitStatus=0
+
+[Install]
+WantedBy=multi-user.target
+
+# Built for ${project.name}-${project.version} (${project.name})