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Fastest Way to Gain Root Access in RHCSA7 Exam

This blog post describes the fastest way that I know to change the root password on a RHEL7 platform if you do not know or have forgotten the root password. A typical use case is the RHCSA 7 exam.

My Thoughts on Systemd on RHEL7

This blog post discusses my viewpoint that systemd adds no value when used on an enterprise server such as RHEL7 and, in fact, results in a misuse of scarce corporate or governmental resources for no discernable increase in security or productivity.

So You Think You Are Ready For The RHCSA Exam?

Want to test your RHCSA test preparedness? This blog post provides details of a custom CentOS 7.2 VM which enables you to do exactly that. As close to the real exam experience as possible.

Control Group Subsystems in RHEL7

Control groups (cgroups) are a Linux kernel feature that enables you to allocate resources — such as CPU time, system memory, disk I/O, network bandwidth, etc. — among hierarchically ordered groups of processes running on a system. Initially developed by Google engineers Paul Menage and Rohit Seth in 2006 under the name “process containers”, it was merged into kernel version 2.6.24 and extensively enhanced since then. RHEL6 was the first Red Hat distribution to support cgroups. Cgroups provide system administrators with fine-grained control over allocating, prioritizing, denying, managing, and monitoring system resources. A cgroup is a collection of processes that

RHEL7 Does Not Support User Namespace

The Linux kernel currently implements six (out of 10 proposed) namespaces for process separation: mnt – mount points, filesystems pid – processes net – network stack ipc – System V IPC uts – hostname, domainname user – UIDs, GIDs The last Linux namespace to be fully implemented was the user namespace (CLONE_NEWNS) whose implementation was finally completed in the 3.8 kernel after being started in the 2.6.23 kernel. The current kernel in RHEL7 is 3.10.0-121. Unfortunately it does not include the user namespace. According to Dan Walsh of Red Hat: We hope to add the user namespace support to a