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Linux Format

Linux Format

August 2021

Linux Format is your complete guide to the world of Linux. Whether you've just discovered Linux, or you're a full-time guru, Linux Format has everything you need to make the most of your OS. The editorial formula is a mix of features, reviews and practical tutorials that tackle topics as far ranging as installing software to socket programming and network management. Thought-provoking features and interviews also provide a focus on key technologies, trends and issues in the fast-paced world of Free and Open Source software.

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País:
United Kingdom
Idioma:
English
Editor:
Future Publishing Ltd
Periodicidad:
Monthly
6,13 €(IVA inc.)
56,99 €(IVA inc.)
13 Números

en este número

1 min.
under a cloud

“For us techies, the cloud has made a lot of things easier. Much of it is built on open source technology. Linux is the most common operating system for public cloud services with a 90 per cent share. Open source databases make it easier to host and manage data. But do public cloud providers support open source enough, and do they provide the right kind of support? It’s no surprise that everyone who responded to our latest survey thought public cloud providers could do more. However, 58 per cent of respondents said competition from public cloud companies who use open source projects but don’t contribute back was one of the top challenges currently faced by open source companies. So, how should public cloud providers contribute to open source? The top priority according…

1 min.
straight talking

“With the summer months upon us, so too is the usual conference season, except these are still far from usual times. Several of the big annual Linux conferences have said they’ll have to go virtual once again. As Ted Ts’o put it, it just wouldn’t be practical to hold the kind of discussion format in a socially distanced and safe manner. And while a growing number of countries are rolling out vaccination programmes, others are experiencing a far worse time, to say nothing of international travel constraints. Given the situation, it seems only reasonable to exercise caution, but the conversation on the Linux Kernel Mailing List (LKML) quickly became one of the more bizarre I’ve seen. An IT consultant from Germany replied with a rambling, incoherent rant, laced with conspiracy theories.…

2 min.
happy snaps

Even though a virtual machine isn’t a real computer with physical value, the data that’s on it can still be real and have some value. So it can be as important to be able to back up your virtual computers as the host. You could run a backup program on the guest, but there’s another option: make use of snapshots. A snapshot is a view of your VM at a moment in time, which means you can roll back to that point when needed – for example, after an upgrade that breaks something. Importantly, snapshots can be taken while the VM is running. Taking a snapshot can be near instant, making it an easy way to keep safe. So how do the various programs handle this? Gnome Boxes has a snapshots tab…

2 min.
useful extras

Some of the programs have their own unique (or fairly so) features that may make them particularly suitable for your own computing needs. For example, all of these programs provide an x86 CPU (either 32- or 64 bit) when run on an x86 host. That’s why they’re almost as fast as running the software natively, but Virt-manager can also emulate ARM processors. This is much slower, of course, because it’s carrying out full CPU emulation. On a powerful-enough host, it means you can develop or test software for other platforms, such as the Raspberry Pi and other SBCs. Gnome Boxes, Aqemu and Virt-manager are all frontends for the command line qemu program. Aqemu has a button to show you the exact command and arguments used to run a guest. This means…

1 min.
also consider

We have mentioned Qemu a few times here, it’s the engine that powers three of these programs. Qemu is command line only, but may be more suitable for some needs. The learning curve is steeper but you do get access to all of its features, not just those that the GUI exposes. Libvirt is another command line option, which is used for managing Qemu VMs and the layer behind Virt-manager. It may be that this program could suit your requirements if a GUI isn’t necessary. It’s also worth considering whether you actually need a fully virtualised computer in the first place. If you’re trying to run software away from your existing OS – perhaps for security reasons – or want different versions of software, then you may find that some type…

1 min.
a tale of two centoses

CentOS 7 was released in 2014 and if you’re still using it you’re safe. Red Hat will honour the original support period and so you’ll receive maintenance and security updates until 2024. CentOS 8 was launched in 2019, with the same stated 10-year support period. So imagine the furore when users of CentOS 8 learned that their OS would instead be sunsetted not in 2029, but at the end of 2021, in order that Red Hat focus on its own CentOS Stream offering. CentOS Stream was introduced in 2019 with the goal of being a truly open source upstream for RHEL. This would bring development of RHEL, which hitherto had taken place behind ominously closed doors, out into the open. When the distinctively unfestive (December 2020) announcement was made that this would…