Install ssh on Ubuntu 18.04

Enable SSH on Ubuntu 18.04 Bionic Beaver Linux

Objective

The below guide will provide you with information on how to enable ssh on Ubuntu 18.04 Linux. SSH stands for secure shell which allows encrypted remote login connections between client and server over insecure network.

Operating System and Software Versions

  • Operating System: – Ubuntu 18.04 Bionic Beaver
  • Software: – OpenSSH 7.5 or higher

Requirements

Privileged access to your Ubuntu System as root or via sudo command is required.

Conventions

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SSH Server on Ubuntu 20.04 Focal Fossa Linux

Enable SSH on Ubuntu 20.04 Focal Fossa Linux

The below guide will provide you with information on how to enable ssh on Ubuntu 20.04 Focal Fossa Server or Desktop Linux. SSH stands for secure shell which allows encrypted remote login connections between client and server over an unsecure network.

In this tutorial you will learn:

  • How to install SSH daemon
  • How to enable SSH daemon to start after reboot
  • How to start SSH daemon server
  • How to open firewall SSH port 22
  • How to allow root login to SSH server

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Active SSH service and firewall SSH port 22 open on RHEL 8

RHEL 8 / CentOS 8 enable ssh service

The following article will explain how to install and start SSH service on RHEL 8 / CentOS 8 system. SSH is a client-server service providing secure encrypted connections over the network connection.

In this tutorial you will learn:

  • How to Install SSH service.
  • How to start SSH service.
  • How to enable SSH to start after reboot.
  • How to open SSH port 22 for incoming traffic.

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Active SSH Server Daemon on RHEL 8 Linux server/workstation.

Install ssh server on CentOS 8 / RHEL 8

The SSH server might already be installed on your RHEL 8 / CentOS 8 system. You can check the status of your SSH server using the systemctl status sshd command. We will then install the openssh-server package below by using the dnf command.

In this tutorial you will learn:

  • How to install SSH server onRHEL 8 / CentOS 8.
  • How to open SSH firewall port 22 on RHEL 8 / CentOS 8.
  • How to enable SSH to start after reboot on RHEL 8 / CentOS 8.

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JSch example execution

Executing commands on a remote machine from Java with JSch

SSH is an every-day tool of any Linux System Administration job. It is an easy and secure way to access remote machines on the network, transfer data and execute remote commands. Apart from interactive mode, there are many tools exist that enable automation of remote tasks that also rely on the existing ssh server/client architecture. For one such tool, you can read about ansible on Ubuntu for example. You can also find many implementations of the ssh client, but what about accessing the abilities ssh provides from code?

JSch is a project that implements the ssh protocol in Java. With it’s help, you can build applications that are capable to connect to and interact with a remote or local SSH Server. This way your application is capable of managing any aspect of the target machine that you could complete with your native ssh client, which gives yet another powerful addition to the already vast Java toolset.

In this article we will import JSch into our Java project, and develop the minimal necessary code pieces to create an application that can log in to a remote machine’s ssh server, execute some commands in the remote interactive shell, closes the session, then presents the output. This application will be minimal, however, it may give a hint of the power it provides.

In this tutorial you will learn:

  • How to import JSch into your Java project
  • How to setup the test environment
  • How to implement the UserInfo interface in a custom class
  • How to write an application that initiates interactive ssh session

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