CentOS

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How to Set & Change Hostname & FQDN (Fully Qualified Domain Name) in RHEL & CentOS 7

In a networking environment, all computer systems, be it Windows PC, Linux server or Unix mainframe, has a hostname. A hostname is a label (also known as computer name) that is assigned to a device connected to [...]

No iptables / ip6tables Bootup Action Was Found at Webmin Networking in CentOS / RHEL / Fedora 7

When going to Linux Firewall module in Webmin Networking (which also used by Virtualmin and Cloudmin), the following error message is displayed: No iptables bootup action was found, indicating that the IPtables package is not installed on [...]

How to Install Let’s Encrypt in CentOS / RHEL / Fedora / FreeBSD / OpenBSD / Ubuntu / Linux

Let's Encrypt is a free, automated, and open certificate authority (CA) that provides Domain Validated (DV) certificates essential for SSL, which enables the HTTPS secure connection that encrypts data transfer. . The DV certificate verifies that you [...]

ABRT ImportError: No Module Named argparse Crash Error

Large number of error emails is sent by ABRT Daemon to web server's administrator, and system log is filled with the following message: [abrt] a crash has been detected again abrt_version: 2.0.8 cmdline: /usr/bin/python /usr/libexec/abrt-action-generate-machine-id -o /var/spool/abrt/pyhook-2015-08-06-07:11:17-55377/machineid [...]

Install Munin Tracking & Monitoring System (RedHat/CentOS/Ubuntu/SUSE)

Munin Monitoring System is one of the popular computer system, network and infrastructure monitoring tool. With Munin, real-time information about the servers, applications, services, SANs, network and many more resources is available in graphs through a web [...]

Update & Add CA Certificates Bundle in RedHat & CentOS

Red Hat Enterprise Linux (RHEL), CentOS, Fedora, Scientific Linux and other Linux distributions derived from RHEL provides the system-default legacy classic CA certificate trust bundle Mozilla root CA list, where they have classic file names and are [...]

List All Packages Installed by a Specific Repo in CentOS / RedHat with YUM

Red Hat Enterprise Linux (RHEL), Fedora, CentOS and Scientific Linux allows administrators to add and enable multiple repositories (repos) to install software packages that are not included in the default base and updates repositories. Over time, the [...]

CentOS YUM / RPM Error: rpmts_HdrFromFdno / rpmdbNextIterator: Header V3 RSA/SHA1 Signature Key ID BAD

When running YUM or RPM commands, the following errors occurred: error: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID XXXXXXXX: BAD error: rpmdbNextIterator: skipping h# XXXX Header V3 RSA/SHA1 Signature, key ID XXXXXXXX BAD Error: Cannot retrieve metalink [...]

Cannot Retrieve Metalink for Repository: EPEL

When using yum to install or update software packages through "yum install" or "yum update" commands, the following stop error occurred: Loaded plugins: fastestmirror, security Loading mirror speeds from cached hostfile Error: Cannot retrieve metalink for repository: [...]

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