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

Screenshot 2018-02-12 22.18.14.png

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.

Install xmrig dependencies.
sudo apt-get install git build-essential cmake libuv1-dev libmicrohttpd-dev
. 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
```
Make a directory to compile xmrig into.
```
mkdir build
cd build
```
Compile xmrig.
```
cmake ..
make
```

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/

Make sure that the new miner is executable.

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

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]

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

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]

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.