WordPress: Run SSH command remotely

ssh-remote-command.php

<?php
/**
 * Plugin Name: SSH Remote Test
 */

add_action( 'admin_init', 'ssh_remote_test', 1 );


function ssh_remote_test() {

	// this is VERY basic demonstration code for running a remote SSH command.

	// files for the filesytem classes
	require_once( ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php' );
	require_once( ABSPATH . 'wp-admin/includes/class-wp-filesystem-ssh2.php' );

	if ( class_exists( 'WP_Filesystem_SSH2' ) ) {

		// Also accepts public_key and private_key filenames.
		$options = array(
			'port' => 22,
			'hostname' => 'host.com',
			'username' => 'username',
			'private_key' => '/srv/www/keys/username/id_rsa',
			'public_key' => '/srv/www/keys/username/id_rsa.pub',
		);

		if ( ! defined('FS_CONNECT_TIMEOUT') )
			define('FS_CONNECT_TIMEOUT', 30);
		if ( ! defined('FS_TIMEOUT') )
			define('FS_TIMEOUT', 30);

		$ssh = new WP_Filesystem_SSH2( $options );

		// check for errors
		// if ssh2 is not an installed PHP extension:  sudo apt-get install libssh2-php php7.0-ssh2
		if ( ! empty( $ssh->errors->errors ) ) {
			var_dump( $ssh->errors );
			die();
		}

		if ( ! $ssh->connect() ) {
			echo 'unable to connect';
		} else {

			echo '<pre>';

			$ls_results = $ssh->run_command( 'ls -latrh' );

			echo $ls_results;

		}

	}


	die();
}