SSH (Secure Shell) is a protocol used to establish an encrypted connection with a remote machine using a client-server model: the ssh server runs on the machine we want to access remotely, while a client is used on the machines from which we want to connect. Thanks to sshfs, we can use an existing SSH connection to mount a remote directory in a secure way, without using additional services like NFS or Samba.
If you frequently use your Linux system to connect to a specific host, it can be convenient to make an alias for the hostname or IP address. This is especially true if the host has a long name or URL, and you do not want to keep typing the whole thing out every time you need to connect. There are several ways to create a host alias on Linux, depending on how you ordinarily connect to the host.
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.
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 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.
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.
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.
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.
The SSH protocol in Linux is used to manage remote systems. It works by allowing you to securely log in to a remote device, which could be another Linux system, firewall, router, etc. When you are finished with your remote administration, it will be time to disconnect from the SSH connection.
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.
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.