Linux

Overview

ITOSS manages Linux systems through the SSH instrumentation, the standard protocol for managing Linux and Unix systems. No agent needs to be installed on the target server: the ITOSS Collector connects remotely, executes monitoring commands, and processes the results.

+----------------------+
|        ITOSS         |
|      Collector       |
+----------+-----------+
           |
           | SSH (TCP 22)
           | Key-based or password authentication
           v
+----------------------+
| Target Linux Server  |
| Dedicated user itoss |
+----------------------+

Supported Authentication Methods

Method	Recommended For	Guide
SSH Public Key	Production and unattended automation (preferred)	SSH Key-Based Authentication
Username and Password	Only when key-based authentication cannot be implemented	SSH Password Authentication

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Setup

Requirements

• Linux server with OpenSSH Server installed and the SSH service enabled.
• Administrative access to the target server (required only during setup).
• Network connectivity from the ITOSS Collector to the target server on the SSH port (default 22).
• A dedicated service account for ITOSS (for example itoss). Never use root or personal accounts.
• Shell access for the service account (/bin/bash).
• ITOSS credential repository available.

Verify the SSH service status:

sudo systemctl status sshd

or, on Debian/Ubuntu:

sudo systemctl status ssh

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Registering a Linux Server in ITOSS

Complete the SSH connection fields according to the authentication type.

Field	Parameter	Password Authentication	SSH Public Key Authentication
target	ssh_target	Hostname or IP address (e.g. 8.243.164.21)	Hostname or IP address (e.g. 8.243.164.21)
user	ssh_user	Service account (e.g. itossuser)	Service account (e.g. itossuser)
password	ssh_password	Service account password	Private key passphrase, or N/A if the key has no passphrase
port	ssh_port	22	22
authenticationtype	ssh_authenticationType	PASSWORD	PRIVATE_KEY
identityfile	ssh_identityFile	N/A	Path to the private key on the ITOSS Collector (e.g. ~/.ssh/id_ed25519_itoss)

For SSH Public Key Authentication, the private key file must exist on the ITOSS Collector at the path set in ssh_identityFile, and the matching public key must be installed in ~/.ssh/authorized_keys of the service account on the target server. If the private key is protected with a passphrase, set it in ssh_password.