How To Install autossh on CentOS 8

autossh is Utility to autorestart SSH tunnels

Introduction

In this tutorial we learn how to install autossh on CentOS 8.

What is autossh

autossh is a utility to start and monitor an ssh tunnel. If the tunnel dies or stops passing traffic, autossh will automatically restart it.

We can use yum or dnf to install autossh on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install autossh.

Install autossh on CentOS 8 Using dnf

Update yum database with dnf using the following command.

sudo dnf makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install autossh using dnf by running the following command:

sudo dnf -y install autossh

Install autossh on CentOS 8 Using yum

Update yum database with yum using the following command.

sudo yum makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install autossh using yum by running the following command:

sudo yum -y install autossh

How To Uninstall autossh on CentOS 8

To uninstall only the autossh package we can use the following command:

sudo dnf remove autossh

autossh Package Contents on CentOS 8

/etc/autossh
/usr/bin/autossh
/usr/lib/.build-id
/usr/lib/.build-id/57
/usr/lib/.build-id/57/0a9967d7944fad6949343fca218259ecffe77b
/usr/lib/systemd/system/[email protected]
/usr/share/doc/autossh
/usr/share/doc/autossh/CHANGES
/usr/share/doc/autossh/README
/usr/share/doc/autossh/README.service
/usr/share/doc/autossh/examples
/usr/share/doc/autossh/examples/autossh.host
/usr/share/doc/autossh/examples/rscreen
/usr/share/man/man1/autossh.1.gz

References

Summary

In this tutorial we learn how to install autossh on CentOS 8 using yum and dnf.