In this post, I’m going to introduce you to a cool technology for Kubernetes, LTSP. It is useful for large baremetal Kubernetes deployments.

You don’t need to think about installing an OS and binaries on each node anymore. Why? You can do that automatically through Dockerfile!

You can buy and put 100 new servers into a production environment and get them working immediately - it’s really amazing!

Intrigued? Let me walk you through how it works.

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Few time ago LINBIT released their new solution LINSTOR which is providing orchestration tool for manage multiple DRBD-arrays.

For example you can have few nodes, each one will have own LVM or ZFS pool, LINSTOR will automatically create new volumes there and replicate or distribute them using DRBD protocol.

LINSTOR supports thin-provisioning, snapshots and many other interesting things.

This solution is good suitable for virtual machines and containers.

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I can tell you how you can run kubernetes master in LXC container, I use Proxmox and it is working really fine, this manual can serve as an alternative way for the classical several masters deployment.
In this case you can have only one master, and still have all the features of multimater.

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This time I would like to tell how to configure this subject, in a particular each separate component as a result to receive the own, expanded, otkazoustoycheavy cloud based on OpenNebula. In this article I will consider the next moments:

Subjects in itself very interesting so even if you are not interested in an ultimate goal, but setup of some separate component interests. I ask favor under cut.
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Has decided to try here the other day ZFS, and detailed and simple manual as to carry out it on CentOS has not found, has decided to correct situation. Besides there was a wish to set all this in the EFI mode. — not to stand still? And at the same time to understand for itself as DKMS, and also aspects of the manual RPM-based installation of distribution kits works.

ZFS has been selected too not accidentally as by this machine it was going to unroll hypervisor and to use zvol for storage of images of virtual computers. I wanted something bigger than program raid + lvm or simple file storage of images, something on similarity of ceph, but for one host it is too bold. Running forward I will tell that I was very pleased with this file system, its productivity and all its counters.
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Earlier, I quite often had such situation when at the same time you work in the terminal and, for example, in the browser.
After several business hours you start being confused and in the terminal instead of [Ctrl] + [Shift] + [C] you click [Ctrl] + [C], and in the browser on the contrary. As a result in the terminal you receive interruption and in the browser instead of the expected effect at you the debagger slowly progruzhatsya.
Once it has got me and I have decided that it is time to change something…
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Cloud Architect

WEDOS Internet, a.s.

Hluboká nad Vltavou