Adding a CPU miner to smOS

In this tutorial we add the xmrig cpu miner to smOS. It’ll be helpful if you have a basic understanding of linux cli. I have a tutorial here Linux CLI (Command Line Interface) primer for beginners — Steemit

I won’t cover how to ssh here. See my bminer tutorial for that. Here is how to secure ssh for smOS https://steemit.com/mining/@greerso/securing-ssh-for-smos.

1. Install xmrig dependencies.
   sudo apt-get install git build-essential cmake libuv1-dev libmicrohttpd-dev
2. . Download xmrig-2.4.4 (version 2.4.4 at the time of writing) from GitHub. You can read more about xmrig on their GitHub repo GitHub - xmrig/xmrig: Monero (XMR) CPU miner.

   git clone https://github.com/xmrig/xmrig.git
   cd xmrig-2.4.4
   

3. Make a directory to compile xmrig into.

   mkdir build
   cd build
   

4. Compile xmrig.

   cmake ..
   make
   

5. Make a directory in the smOS miners_org and move xmrig into it.

   sudo mkdir /root/miner_org/xmrig-2.4.4&&sudo mv xmrig /root/miner_org/xmrig-2.4.4/
   

6. Make sure that the new miner is executable.

   sudo chmod +x /root/miner_org/xmrig-2.4.4/xmrig
   

7. Create a config file in the xmrig directory.

   sudo nano /root/miner_org/xmrig-2.4.4/config.json
   

   and paste the following text replacing your own preferences:

   {
   "algo": "cryptonight",  // cryptonight (default) or cryptonight-lite
   "av": 0,                // algorithm variation, 0 auto select
   "background": true,    // true to run the miner in the background
   "colors": true,         // false to disable colored output
   "cpu-affinity": null,   // set process affinity to CPU core(s), mask "0x3" for cores 0 and 1
   "cpu-priority": null,   // set process priority (0 idle, 2 normal to 5 highest)
   "donate-level": 1,      // donate level, mininum 1%
   "log-file": null,       // log all output to a file, example: "c:/some/path/xmrig.log"
   "max-cpu-usage": 75,    // maximum CPU usage for automatic mode, usually limiting factor is CPU cache not this option.
   "print-time": 60,       // print hashrate report every N seconds
   "retries": 5,           // number of times to retry before switch to backup server
   "retry-pause": 5,       // time to pause between retries
   "safe": false,          // true to safe adjust threads and av settings for current CPU
   "syslog": false,        // use system log for output messages
   "threads": null,        // number of miner threads
   "pools": [
       {
           "url": "us-east.cryptonight-hub.miningpoolhub.com:20596",   // URL of mining server
           "user": "greerso.Trio_CPU",                        // username for mining server
           "pass": "x",                       // password for mining server
           "keepalive": true,                 // send keepalived for prevent timeout (need pool support)
           "nicehash": false                  // enable nicehash/xmrig-proxy support
       }
   ],
   "api": {
       "port": 3333,                             // port for the miner API https://github.com/xmrig/xmrig/wiki/API
       "access-token": null,                  // access token for API
       "worker-id": null                      // custom worker-id for API
       }
   }
   

   Exit nano and save.

   [ctrl+x]
   y
   [enter]
   

8. If you wish to test the miner, change the background mode above to "background": false and run the command

   sudo /root/miner_org/xmrig-2.4.4/xmrig
   

   You will see the miner output to the screen.

   [ctrl]+c
   

   to cancel
9. Run xmrig as a service.

   sudo nano /lib/systemd/system/xmrig.service
   

   paste the following text

   [Unit]
   Description=XMRig Daemon
   After=network.target
   
   [Service]
   Type=forking
   GuessMainPID=no
   ExecStart=/root/miner_org/xmrig-2.4.4/xmrig -c /root/miner_org/xmrig-2.4.4/config.json -B
   Restart=always
   User=miner
   
   [Install]
   WantedBy=multi-user.target
   

   Exit nano and save.

   [ctrl+x]
   y
   [enter]
   

10. Enable the new service.

    sudo systemctl daemon-reload
    sudo systemctl enable xmrig.service
    sudo systemctl start xmrig.service
    

    You can control the service with the following commands

    sudo systemctl status xmrig # Get status of service
    sudo systemctl stop xmrig # Stop the service
    sudo systemctl restart xmrig # restart the service
    

The cpu miner will not be able to be monitored via simplemining.net but it does have an api accessible on the port specified in the config.json file.