Linux memory management

I think that is a common question for every Linux user soon or later in their career of desktop or server administrator “Why Linux uses all my Ram while not doing much ?”. To this one today I’ve add another question that I’m sure is common for many Linux system administrator “Why the command free […]

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Spectre and Meltdown explained

By now, most of you have probably already heard of the biggest disaster in the history of IT – Meltdown and Spectre security vulnerabilities which affect all modern CPUs, from those in desktops and servers, to ones found in smartphones. Unfortunately, there’s much confusion about the level of threat we’re dealing with here, because some […]

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Jenkins on CentOS 7

Jenkins is a free and open source CI (Continuous Integration) tool which is written in JAVA. Jenkins is widely used for project development, deployment, and automation. Jenkins allows you to automate the non-human part of the whole software development process. It supports version control tools, including AccuRev, CVS, Subversion, Git, Mercurial, Perforce, ClearCase and RTC, […]

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XFS Filesystem has duplicate UUID problem

If you can not mount your XFS partition with classical wrong fs type, bad superblock etc. error and you see a message in kernel logs (dmesg) like that: XFS: Filesystem sdb7 has duplicate UUID – can’t mount you can still mount the filesystem with nouuid options as below: mount -o nouuid /dev/sdb7 disk-7 But every […]

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