Image of Advanced Programming in the UNIX Environment, Second Edition (Addison-Wesley Professional Computing Series)
Image of Modern Operating Systems (3rd Edition)
Image of Linux Kernel Development (3rd Edition)
Image of XSLT 2.0 and XPath 2.0 Programmer's Reference (Programmer to Programmer)


Project Atomic, a Red Hat sponsored project, features an interesting new update system for RPM-based Linux operating systems called OSTree (rpm-ostree) which has been developed by Colin Walters over the last couple of years. Evidently OSTree supports atomic updates to an OS although I am not sure how that actually works because there is a lot of marketing hype and buzz words associated with Project Atomic including Docker containers. In the default model, the RPMs are composed on a server into an OSTree repository, and client systems can replicate in an image-like fashion, including incremental updates. However, unlike traditional Linus

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

Network Namespaces in RHEL7

Linux namespaces are somewhat like Solaris zones in many ways from a user perspective but have significant differences under the hood. The term namespace isolation is often used because the purpose of namespaces is to provide a group of processes with the illusion that that they are the only processes on the system. This is an important requirement for implementing Linux Containers. Namespaces were developed over a number of years by Eric W. Biederman (user namespaces), Pavel Emelyanov, Al Viro, Cyrill Gorcunov, et al. Six user namespaces (out of 10 proposed) are implemented in RHEL7: mnt – mount points, filesystems