Dell Latitude E6420 Supports 16GB RAM

Although it is well documented that the Dell Latitude E6420 supports up to 8GB of RAM.  Since memory prices have dropped over time, it was well worth the chance to upgrade the 8GB of RAM to 16GB of RAM.  This may not work for everyone, but, it certainly worked on one Dell Latitude E6420 laptop. Using crucial.com the memory scanner...Read More »

Linux: the System Request Key

Everyday with Linux there seems to be something new to learn or a little tidbit that is worth remembering.  This time, the sysrq. Activates the System Request Key (aka. the Magic SysRq key), if thi value is set to anything other than zero (0), the default. The System Request Key allows immediate input to the kernel through simple key combinations....Read More »

WSUS Post Install Essentials

There are many articles that more than adequately detail a basic installation of the Windows Server Update Services (WSUS). This article assumes two things. The GPO has been configured and that this is a fresh installation of Windows Server 2012 with WSUS installed. No computers have connected yet. This article picks up at this point. Additional updates and configurations were...Read More »
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Reset Root Password on CentOS7

CentOS7 offers a completely different approach to resetting a forgotten root password than the it's earlier distro of CentOS6.x.  Here are multiple approaches that was tested on CentOS Linux release 7.2.1511 (Core) with success.  The last one being one that I combined from the many different approaches into fewer steps. Reboot the system to the grub2 menu. Press e to...Read More »

nginx: redirect to a new domain except part of the URL pattern

Migrating to newer version of a web application from one domain to another has had it's challenges. Since this web application has multiple projects, each project may be migrated one at a time. The goal is to redirect traffic to the new projects as they are migrated to the new domain. As part of that goal, the projects that have...Read More »

Install and use pdnsd for name service caching

The man pages describe pdnsd as a dns proxy daemon capable of saving the contents of its DNS cache to the disk on exit. The Install Edit the /etc/pdnsd.conf file.  Under server, change the ip value to your DNS server. Edit the /etc/resolv.conf to point the server to itself. For my test, I commented out everything and only added the...Read More »

Install and use ncsd for name service caching

According to Red Hat, "[t]he Name Service Caching Daemon (nscd) is a service that runs in the background and keeps a copy of /etc/passwd, /etc/group, [/etc/netgroup, /etc/services] and /etc/hosts files in /var/db/nscd/ directory. This can aid performance by reducing disk read overhead on a heavily loaded system dealing with many logins or name resolution requests." The installation and usage is...Read More »
yum

Unable to update ca-certificates

Working on an early install of CentOS 6 and trying to update the system, the update failed. Even an attempt to update the ca-certificates failed. It turns out that the EPEL repository was the cause of this. To work past the offending EPEL repository and upgrade the ca-certificates, the following command works. Upon completion, a simple, yum update will work....Read More »