Category Archives: Linux

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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Jetty Dropped AJP Support. Use Tomcat

Apache Tomcat ships with an optimized load balancing / reverse proxy protocol known as AJP or more formally as the Apache Tomcat Connector specification. This makes Tomcat a top choice among the many Java Servlet and JSP web app containers … 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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VNC on CentOS and RHEL 7

This is a follow-on to my earlier posts “VNC on CentOS and RHEL 6” and “RHEL 7 Administration Notes“. Setup of VNC Server on RHEL 7/CentOS 7 is very similar to that of RHEL 6/CentOS 6. The biggest difference is … Continue reading

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bash Group Specific PATH for RHEL 7.x

Users on a RHEL 7.x / CentOS 7.x system may desire to have all members of a specific group receive an altered $PATH environment variable to run 3rd party programs without modifying the user-specific PATH settings. This can be accomplished … Continue reading

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JIRA and Confluence Behind Apache SSL Reverse Proxy

This is just a quick note about running Atlassian JIRA and Confluence behind Apache HTTPD using the strong reverse proxy and SSL features of the full Apache web server. This helps simplify your SSL configuration by keeping the certificate settings … Continue reading

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Dell OpenManage Server Administrator Linux

This is specific to OpenManage Server Administrator (OMSA / srvadmin) on RHEL 7.x, but will likely apply to other similar Dell supported Linux systems (CentOS 7.x, etc). Note that the om* commands are provided with OMSA. The Embedded System Management … Continue reading

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What Linux Folder Is Taking All the Space

The Linux shell provides a lot of helpful commands to analyze your data and manage your system. Here’s a quick sample to get a sorted list of space used by files and folders in your current working directory. This is … Continue reading

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