Tag Archives: CentOS

SSSD-AD TGT failed verification

Users of RHEL 7 and CentOS 7 on Windows Active Directory networks are likely enjoying the benefits of using the SSSD-AD domain-join client module along with the Realmd tool which facilitates proper management of SSSD client configuration (a very complex … Continue reading

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Get Rid of virbr0

In RHEL 7.x and CentOS 7.x you may see an odd extra network interface listed as “virbr0” (virtual bridge zero). This is provided as a default way to share the host physical network with private guest virtual machines. Unfortunately this … Continue reading

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Tomcat Multiple Instances RHEL 7 CentOS 7

This is a follow-on to my earlier posts Apache Tomcat in RHEL 7 and RHEL 7 Administration Notes. This builds on the goal to use the system packaged Tomcat and Java software in order to receive security and bug fix … Continue reading

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Mount CIFS Share on RHEL/CentOS

Some quick notes regarding mounting CIFS shares on RHEL and CentOS. Note that system-wide network filesystem mounts are typically specified in /etc/fstab and require supported kernel modules for compatible vfs filesystem types. In the case of SMB filesystems, the modern … Continue reading

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yum-cron

Red Hat Enterprise Linux 7 (RHEL 7) provides a package for automated updates called yum-cron. Here are some notes on this functionality. NOTE in RHEL 7, the old “vixie-cron” has been replaced by the modern Red Hat fork “cronie” which … Continue reading

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Identity Management Using IPA in CentOS and RHEL

UPDATED 8 Jan 2016 to include RHEL 7 IPA (Linux Domain) document which also applies to CentOS 7. I have also added a section at the bottom for Active Directory organizations desiring to add Linux IPA client systems directly to … Continue reading

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RHEL 6.x and CentOS 6.x Cron and At Utilities

Linux System Administrators responsible for RHEL 6.x and CentOS 6.x systems need to be able to automate system tasks. The official Red Hat Enterprise Linux (RHEL) 6.x “Deployment Guide” documentation includes a good tutorial on the popular “Cron” and “At” … Continue reading

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World-Class Package Selection in CentOS and RHEL

If you use Red Hat Enterprise Linux (RHEL) or CentOS, you may have noticed that even the latest 6.x distributions lack many common packages found in more progressive systems like Fedora or Ubuntu. Thankfully there is an easy fix provided … Continue reading

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Heirloom mailx for Quick Command-Line Email

If you manage Linux systems, you may need a quick way to send email from the command line. My recommended solution for simple scripted email is the Heirloom mailx utility. There are several reasons I like this tool. My favorite … Continue reading

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Red Hat and CentOS in Synergy

It is a beautiful thing when organizations can promote each-other resulting in a greater combined product and maximum benefit for the customer. The synergy between Red Hat Enterprise Linux (RHEL) and CentOS is an excellent example of rare cooperation and … Continue reading

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