- Ubuntu Server - Install SSH Server on Ubuntu 16.04 LTS Playlist: Playlist.
- Step 1: Install & Configure SSH Server. 1.1 Install SSH server. Sudo apt-get install openssh-server -y.
In this tutorial we are going to learn how to install and configure SSH Server on Ubuntu Server/Desktop Operating System. The Secure Shell (SSH) is the most common and secure way to manage Ubuntu using a command line from a remote location.
How to install SSH Server on Ubuntu 18.04 Bionic Beaver Linux.
For this tutorial I am using Ubuntu 18.04 LTS, But you can use the following guide to setup SSH Server on any previous Ubuntu version.
Install OpenSSH Server on Ubuntu 18.04
The SSH Server for Ubuntu is provided by the openssh-server package. If not already installed, you can install openssh-server package in Ubuntu 18.04, using the apt-get install command.
To install OpenSSH, open the Ubuntu terminal and execute:
This will install the SSH Server on our Ubuntu System.
Start SSH Server on Ubuntu
OpenSSH Server should start automatically after the installation, if not, to start the SSH Server on Ubuntu 18.04, we use the systemctl command.
In Ubuntu 14.04 use service command to start the ssh service.
Enable SSH root login in Ubuntu
By default SSH Server in Ubuntu do not allow to connect to the server using the root username. In order to allow root SSH Login we need to change PermitRootLogin to yes in the /etc/ssh/sshd_config file.
First, Open the /etc/ssh/sshd_config file.
Install Ssh Server On Ubuntu 18.04
Then locate the line PermitRootLogin directive, uncomment (remove the # in front) and change its value to yes.
Then, Save the SSH Configuration file and restart the SSH Server.
Or
Now you can login to the Ubuntu SSH Server using the root user Account.
Summary - Setup SSH Server on Ubuntu
Ubuntu 16.04 Server
In this tutorial we learned how to install SSH Server on Ubuntu Linux.
- SSH Server for Ubuntu provides by the openssh-server package. OpenSSH is the most widely deployed SSH server in the world
- By default Root Login to the SSH Server is disabled in Ubuntu Linux.
- To enable Ubuntu root SSH login, we need to set PermitRootLogin yes in the /etc/ssh/sshd_config file.
Install OpenSSH on Ubuntu 18.04
05 Jan 2020 - by 'Maurits van der Schee'
In a previous post I have installed Ubuntu 18.04 on my Dell R720xd. In this post I will show how to install OpenSSH on it, so that we no longer need the iDRAC for system administration. After setting up SSH to securely manage the server we only need the iDRAC when we misconfigure the firewall or the network.
Install OpenSSH
Installing OpenSSH can be done by selecting the 'OpenSSH server' in the software selection screen of the network installer. Alternatively you can install it, or ensure that it is installed, by running the following command:
This should start and enable the SSH server. To verify that it is running you can run:
It should output:
It should output:
Now you can also test connectivity by running:
![Ubuntu Ubuntu](/uploads/1/1/7/7/117781925/218998986.png)
It should (immediately) output:
You can end the command with Ctrl-C (or pressing enter twice, triggering a 'Protocol mismatch'). If your SSH is not running then there will be no output.
Enable the firewall
To enable UFW (Uncomplicated FireWall) and allow only port 22 (for SSH) towards this server you can run:
To verify that UFW is running, you can run the following command:
It should output:
Showing that only port 22 is allowed on both IPv4 and IPv6.
Avoid double logging
![18.04 18.04](/uploads/1/1/7/7/117781925/438653681.jpg)
Unfortunately UFW spams the
/var/log/syslog
by default with 'block' messaging, while it already logs to /var/log/ufw.log
. We can avoid this double logging by running:and changing the last line from:
to:
Setup Ubuntu Server 16.04
To make this effective we need to restart the
rsyslog
service using:Now your UFW log messages should no longer show up in
/var/log/syslog
.Some SSH configuration
You may want to login to the server using SSH on the machine and transfer your public keys.You need to put your public keys (one per line) in the file
~/.ssh/authorized_keys
.IMPORTANT: check that you connect to the server without entering a password, before continuing.
Now you can disable (interactive) password logins in the SSH config by running:
change the line:
into:
Now restart ssh for these changes to take effect:
And now the server is online and secure.
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Resetting the firewall
If you have made a mess of the firewall rules, then you can run the following to delete all rules (!) and reset everything:
This does not only reset the ufw firewall, but also the (filter chain of the) underlying iptables firewall. By immediately allowing port 22 and 'forcing' the two commands that require confirmation you may even run this over a SSH connection.
SSH usage guidelines
Here are a few rules on good SSH usage for users:
- NEVER store your SSH (private) key unencrypted (use
ssh-keygen -p
to set a passphrase). - NEVER move (private) keys to another computer, they identify a user at a computer.
- when using a bastion or jump host, use the
ssh -A
option (do NOT copy private keys).
Ubuntu Server Gui
Please also consider to use SSH certificates in your cloud infrastructure.
Next: install KVM
In the next post I will walk you through a setup of KVM on Ubuntu 18.04 LTS. We will turn this machine into a proper hypervisor for your virtual machines. I will do this using open source only and also only from the command line.
Click here to read the next article (on installing KVM).
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