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My thoughts on Docker, i.e. Linux Containers

Docker is an open-source project, started by Solomon Hykes of dotCloud, that automates the packaging of an application and its dependencies, and the deployment of such applications inside software containers on a Linux kernel. Currently the technology is being strongly pushed by the Linux community and especially by Red Hat. Unlike hypervisor-based virtual machines, a Docker container does not include the kernel or all the operating system libraries, shells and utilities. Instead, it relies on functionality in the Linux kernel (cgroups, LXC, etc.) to provide resource and namespace isolation. In many ways this is similar to the older Oracle Solaris

Anaconda Fails When BIOS RAID Metadata Encountered

Anaconda (the RHEL, CentOS and Fedora installer) does not handle disks which were previously used in a BIOS or software RAID very well. Typically, it will refuse to install an OS on such disks. This is because it finds metadata relating to the RAID on the disk. The term BIOS RAID (or Fake RAID) denote a system with a BIOS that is able to do basic RAID operations on an array of disks. Such a system has no actual RAID controller. Instead, an OS driver is required. One metadata format commonly found on modern RAID systems (real as well as

Kernel Tracing Using Ftrace

This post explores the ftrace kernel tracing facility which has been available in the Linux kernel since early 2009. It also discusses the trace-cmd CLI frontend to ftrace and the kernelshark GUI for displaying and filtering the data generated by ftrace.