Roman Mohr

Creating and managing network devices, Traffic Control, routing and iptables, introspecting and manipulating network packets. That normally involves a lot of low level C programming, which introduces a huge gap between frontend (web and service oriented) and backend needs (systems programming). Go is excellent in bridging this gap in general, and thanks to the great work of the Go community, networking tasks are very easy to solve too. This session will introduce a set of libraries which form a comprehensive Swiss Army Knife to tackle almost any network related task on Linux with Go.

Declarative systems, like Kubernetes are nice. Instead of forming the state of the system command-by-command, one just posts a set of declarative requirements. The system will try to adapt. While it easy to understand how to use such a system from the user perspective, it requires a complete rethinking for us engineers on how to integrate with such a system. Based on the experiences with extending Kubernetes for KubeVirt with the Kubernetes-Go-SDK, this session gives a short and concise overview on what is required to implement declarative flows in general and particularly in Kubernetes. Real-world examples and pitfalls included.

Declarative systems, like Kubernetes [1] are nice. Instead of forming the state of the system command-by-command, one just posts a set of declarative requirements. The system will try to adapt. While it easy to understand how to use such a system from the user perspective, it requires a complete rethinking for us engineers on how to integrate with such a system. Based on the experiences with extending Kubernetes for KubeVirt [2] with the Kubernetes-Go-SDK [3], this session gives a short and concise overview on what is required to implement declarative flows in general and particularly in Kubernetes. Real-world examples and pitfalls included.

[1] https://kubernetes.io/ [2] https://github.com/kubevirt/kubevirt [3] https://github.com/kubernetes/client-go

How do you integrate containers in your IaaS? In a VM based IaaS environment, introducing containers can be a painful experience. Most likely you end up running containers inside VMs to reuse existing infrastructure, or you start dividing your data-center into a container- and a VM-world. Either way, you have two management solutions and non optimal resource management. But what if we put VMs inside containers? Would such a copernican revolution give us some benefits? This talk covers our research around using Kubernetes as a virtual machines cluster manager.

How do you integrate containers in your IaaS? In a VM based IaaS environment, introducing containers can be a painful experience. Most likely you end up running containers inside VMs to reuse existing infrastructure, or you start dividing your data-center into a container- and a VM-world. Either way, you have two management solutions and non optimal resource management. But what if we put VMs inside containers? Would such a copernican revolution give us some benefits? This talk covers our research around using Kubernetes as a virtual machines cluster manager.

First we will briefly look into what a typical container and a typical VM is. Then we will look into the details on how resource and device limitations are enforced on VMs. In our research we used oVirt, so comparing its host side stack (VDSM/libvirt/QEMU/systemd) to Kubernetes container host side stack (kubelet/docker/rkt/systemd/cni). At the end we will have a better understanding of the differences and overlaps, and can therefore consider how to manage Pet-VMs and containers in the same cluster, managed by kubernetes.

[1] https://github.com/Netflix [2] http://www.ovirt.org

Have you heard your colleagues discussing for weeks why your product is so slow? Did everyone have different components under suspicion? Did you sit in front of a project consisting of tens of thousands of lines of code and tried to pin down the bottle necks? Don't want to use proprietary services like New Relic APM or XRebel? In this presentation we will have a closer look on how to make visible what is inside your Java monolith with Hystrix by Netflix. After an overview is given, I will show how we implemented Hystrix into oVirt to hunt down bottle necks and architectural problems.