Category Archives: System Administration

Cisco ASA Command Line Basics

This post is for people who are new to the Cisco ASA command line, or seasoned network administrators like myself who need to review or brush up on the command line basics for the ASA console. Instead of using my … Continue reading

Posted in Networking, System Administration | Tagged , , | Leave a comment

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

Posted in Linux, System Administration | Tagged , , , , | Leave a comment

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

Posted in Linux, Networking, System Administration | Tagged , , , | Leave a comment

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

Posted in Linux, System Administration | Tagged , , | Leave a comment

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

Posted in Linux, System Administration | Tagged , , | Leave a comment

SharePoint API Invoke-RestMethod PowerShell

Invoke-RestMethod was introduced in PowerShell 3.0, but unfortunately there is a bug that prevents the user from setting the “Accept” header. The SharePoint 2013 REST API requires special values applied to the Accept header to return common items like list … Continue reading

Posted in System Administration | Tagged , , | Leave a comment

Subversion Windows Deduplication Bug

Windows Server 2012 introduced a valuable Data Deduplication feature to reduce physical storage needs on storage volumes where muliple copies of identical data reside. Unfortunately, the way this feature is implemented is visible to client programs in the form of … Continue reading

Posted in System Administration | Tagged , , , , | Leave a comment

Redirect ASP.Net Default Page

Here’s a simple server-side ASP.Net default page redirect example using C# and a typical default.aspx file. This should work with most recent versions of IIS. Key items listed for searchability: page directive, language attribute, script block, runat server, page_load, response.redirect. … Continue reading

Posted in System Administration | Tagged , , | Leave a comment

Dell PERC / MegaRAID Disk Cache Policy

The Dell PERC (PowerEdge RAID Controller) cards provide a competitive server-based fault-tolerant storage solution. NOTE that Dell often quotes a server baseline configuration without any write cache on the RAID card – this makes the baseline config appear to be … Continue reading

Posted in System Administration | Tagged , , , , | 2 Comments

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

Posted in Linux, System Administration | Tagged , , , | Leave a comment