LUKS (Linux Unified Key Setup) is the de facto standard encryption method used on Linux-based operating systems. As we saw in previous tutorials, when we want a partition or raw disk encrypted using LUKS to be automatically unlocked at boot, we need to enter a dedicated line into the /etc/crypttab file. Doing so, we are prompted to provide the encryption password interactively. This is quite straightforward on laptop or desktop machines, but how can we unlock a volume on an headless server? One solution is to use dropbear to get ssh access at an early boot stage, in the initramfs, in order to provide the volume password.
ssh
How to open SSH port 22 on Rehdat 7 Linux server
The SSH protocol operates on port 22 by default. In order to accept incoming connections on your Red Hat 7 Linux SSH server, you will need to ensure that port 22 is allowed through the firewall. This will involve opening the port in firewalld, the default firewall interface for Red Hat.
ssh_exchange_identification read connection reset by peer
The ssh_exchange_identification read connection reset by peer
SSH error is something you may see in your terminal when trying to log in to a remote host or when your session expires on a Linux system. In this tutorial, we will go over a few different causes for this error and show you how to troubleshoot the connection on your system. Using one of our methods below will hopefully remedy the error and allow you to log in via SSH or maintain your current session.
ssh_exchange_identification: connection closed by remote host
If you are trying to SSH into a remote host from a Linux system, the ssh_exchange_identification: connection closed by remote host
error is one you might encounter when trying to log in. In this tutorial, we will go over a few different causes for this error and show you how to troubleshoot the connection on your system. Using one of our methods below will hopefully remedy the error and allow you to log in via SSH.
Introduction to terminal multiplexer Tmux
Tmux is a terminal multiplexer: it let us run and manage multiple terminal sessions from a single screen. This is specially useful when connecting to remote machines using ssh, since, among the other things, it allows us to keep processes started from those terminals running in the background when we disconnect from the session (or logout and close the remote secure shell altogether), letting us re-attach to it at a later time.
How to enable and disable SSH for user on Linux
After installing SSH on your Linux system, one of the most important security practices it to make sure that the service is only enabled for intended accounts. If you have one or more accounts which do not need SSH access, then the service should be disabled for those accounts. This is to prevent one being exploited, or maybe you just do not want that particular user to be using SSH to access the server.
How to open ssh port 22 on Ubuntu 22.04 Jammy Jellyfish Linux
The SSH protocol operates on port 22 by default. In order to accept incoming connections on your SSH server, you will need to ensure that port 22 is allowed through the firewall.
How to setup SFTP server on Ubuntu 22.04 Jammy Jellyfish Linux
In this tutorial, we will show you how to setup an SFTP server on Ubuntu 22.04 Jammy Jellyfish.
Allow SSH root login on Ubuntu 22.04 Jammy Jellyfish Linux
SSH (Secure Shell) is used to handle network services securely over an unsecured network. Some examples include: remote command-line, login, and remote command execution.
SSH remote login syntax and examples
The SSH protocol in Linux is used to manage remote systems. Ordinarily, this would be another Linux system, but it could also be a firewall, router, or even a different operating system entirely. Using the SSH protocol to remotely log into another system will give you a command line terminal that you can fully access as if you were physically in front of the machine.
Enable/Disable Last Login Message on Linux using hushlogin
When logging into a Linux system from the terminal, especially via SSH, you may have noticed some output that gives information about the last login.
Ubuntu 20.04 ssh root login enable
The purpose of this tutorial is to enable root login over SSH on Ubuntu 20.04 Focal Fossa Linux. After installing OpenSSH, logging into the root account is disabled by default. This is done for security purposes. In case an account is compromised, it means the attacker will not automatically have root permissions as well.