How To Install sshguard on CentOS 8
Introduction
In this tutorial we learn how to install sshguard on CentOS 8.
What is sshguard
Sshguard protects hosts from brute-force attacks against SSH and other services. It aggregates system logs and blocks repeat offenders using one of several firewall backends. Sshguard can read log messages from standard input or monitor one or more log files. Log messages are parsed, line-by-line, for recognized patterns. If an attack, such as several login failures within a few seconds, is detected, the offending IP is blocked. Offenders are unblocked after a set interval, but can be semi-permanently banned using the blacklist option.
We can use yum or dnf to install sshguard on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install sshguard.
Install sshguard 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 sshguard using dnf by running the following command:
sudo dnf -y install sshguard
Install sshguard 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 sshguard using yum by running the following command:
sudo yum -y install sshguard
How To Uninstall sshguard on CentOS 8
To uninstall only the sshguard package we can use the following command:
sudo dnf remove sshguard
sshguard Package Contents on CentOS 8
/etc/sshguard.whitelist
/usr/lib/.build-id
/usr/lib/.build-id/2c
/usr/lib/.build-id/2c/3ccefb1ed4396cf6c92fd9278e34270401e903
/usr/lib/.build-id/67
/usr/lib/.build-id/67/4e612608cb94576fd9cae6e69f2dc1e8fe02b2
/usr/lib/.build-id/cf
/usr/lib/.build-id/cf/a1176da7844a11e4a06cf431c7dc6f573e8e27
/usr/lib/systemd/system/sshguard.service
/usr/libexec/sshguard
/usr/libexec/sshguard/sshg-blocker
/usr/libexec/sshguard/sshg-fw-firewalld
/usr/libexec/sshguard/sshg-fw-hosts
/usr/libexec/sshguard/sshg-fw-ipfilter
/usr/libexec/sshguard/sshg-fw-ipfw
/usr/libexec/sshguard/sshg-fw-ipset
/usr/libexec/sshguard/sshg-fw-iptables
/usr/libexec/sshguard/sshg-fw-nft-sets
/usr/libexec/sshguard/sshg-fw-null
/usr/libexec/sshguard/sshg-fw-pf
/usr/libexec/sshguard/sshg-logtail
/usr/libexec/sshguard/sshg-parser
/usr/sbin/sshguard
/usr/share/doc/sshguard
/usr/share/doc/sshguard/CONTRIBUTING.rst
/usr/share/doc/sshguard/README.rst
/usr/share/doc/sshguard/examples
/usr/share/doc/sshguard/examples/sshguard.conf.sample
/usr/share/doc/sshguard/examples/whitelistfile.example
/usr/share/licenses/sshguard
/usr/share/licenses/sshguard/COPYING
/usr/share/man/man7/sshguard-setup.7.gz
/usr/share/man/man8/sshguard.8.gz
/var/lib/sshguard
References
Summary
In this tutorial we learn how to install sshguard on CentOS 8 using yum and dnf.