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Remote access to Ubuntu machine via ssh. Commands.

Task List:

  1. Check that any SSH services are installed on the remote Linux machine 

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    dpkg -l | grep ssh

  2. Check for the correct cervice name
    Run the following command to list all available services related to SSH:

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    systemctl list-units --type=service | grep ssh

    You might see service names like:

    • ssh.service
    • sshd.service
    • openssh-server.service

  3. Check that openssh-server is installed 

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    sudo apt-get install openssh-server

  4. Verify the installed openssh-server configuration 

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    sudo systemctl status sshd

  5. Check secure SSH access via the configuration file 

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    sudo nano /etc/ssh/sshd_config

  6. Confirm that openssh-server is running 

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    sudo systemctl start sshd && sudo systemctl enable sshd

  7. Test SSH connection from a remote system 

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    ssh username@<remote_machine_ip>

  8. Transfer files using SSH from <local_machine> to <remote_machine> 

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    scp /path/to/local/file username@<remote_machine_ip>:/path/to/remote/destination

Additional Commands:

  1. Restart the SSH service after making configuration changes 

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    sudo systemctl restart sshd

  2. Check the active SSH sessions on the remote machine 

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    who | grep ssh

  3. Allow only key-based authentication for SSH connections 

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    sudo nano /etc/ssh/sshd_config
    # Change the following:
    # PasswordAuthentication no
    # PermitRootLogin no

  4. Monitor SSH access logs 

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    sudo tail -f /var/log/auth.log

  5. Put the syste to suspend, by power management (alias pm):

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    sudo pm-suspend

  6. Put the syste to suspend by systemctl:

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    sudo systemctl suspend