Containers
Using crio-lxc with Kubernetes
February 1, 2020
3:45 PM – 4:15 PM Add to calendar
3:45 PM – 4:15 PM Add to calendar
UD2.208 (Decroly)
Running application containers within Kubernetes presents a challenge to the operator for quickly handling security updates - every container must be patched, rebuilt and re-tested, and then updated separately. The slowest dev turnaround of all your containers is the fastest you can fully update your cluster.
However, for many fixes, the application likely will not care which compatible version of a system library it is using.
Using AtomFS, operators can update individual libraries inside app containers without a rebuild. Containers using an AtomFS storage backend can simply be restarted after a fix is applied, and they will see it reflected in their filesystems.
The AtomFS storage backend requires minor changes to your container runtime, and we demonstrate it with the LXC runtime and crio-lxc, an adapter to enable using LXC-based containers in Kubernetes using CRI-O.
In this talk Tycho will cover how AtomFS works, what changes are needed to make application container builds work with AtomFS, and fix an exploit live without a rebuild.
Additional information
| Type | devroom |
|---|
More sessions
| 2/1/20 |
Podman is the container management tool of your choice when it comes to boosting day-to-day development tasks around containers. The journey of Podman started as a drop-in replacement for docker, but nowadays it’s even more than just that. For example, Podman is capable of managing pods, running containers without being root and supports fine granular configuration possibilities.
|
| 2/1/20 |
The biggest problem of the OCI Image Spec is that a container cannot be started until all the tarball layers are downloaded, even though more than 90% of the tarball contents are often unneeded for the actual workload. This session will show state-of-the-art alternative image formats, which allow runtime implementations to start a container without waiting for all its image contents to be locally available. Especially, this session will put focus on CRFS/stargz and its implementation status in ...
|
| 2/1/20 |
BPF as a foundational technology in the Linux kernel provides a powerful tool for systems developers and users to dynamically reprogram and customize the kernel to meet their needs in order to solve real-world problems and without having to be a kernel expert. Thanks to BPF we have come to the point to overcome having to carry legacy accumulated over decades of development grounded in a more traditional networking environment that is typically far more static than your average Kubernetes ...
|
| 2/1/20 |
Kata Containers provide a secure container runtime offering an experience close to that of native containers, while providing stronger workload isolation and host infrastructure security by using hardware virtualization technology. This is particularly useful when containers are used to host and run third-party applications. In this presentation, after a short intro to Kata, we will demonstrate how easy it is to install and use on openSUSE. We will show it in action both as part of a podman ...
|
| 2/1/20 |
Kube-proxy enables access to Kubernetes services (virtual IPs backed by pods) by configuring client-side load-balancing on nodes. The first implementation relied on a userspace proxy which was not very performant. The second implementation used iptables and is still the one used in most Kubernetes clusters. Recently, the community introduced an alternative based on IPVS. This talk will start with a description of the different modes and how they work. It will then focus on the IPVS ...
|
| 2/1/20 |
The difficult task to checkpoint and restore a process is used in many container runtimes to implement container live migration. This talk will give details how CRIU is able to checkpoint and restore processes, how it is integrated in different container runtimes and which optimizations CRIU offers to decrease the downtime during container migration. In this talk I want to provide details how CRIU checkpoints and restores a process. Starting from ptrace() to pause the process, how parasite code ...
|
| 2/1/20 |
Recently the kernel landed seccomp support for SECCOMPRETUSER_NOTIF which enables a process (supervisee) to retrieve a fd for its seccomp filter. This fd can then be handed to another (usually more privileged) process (supervisor). The supervisor will then be able to receive seccomp messages about the syscalls having been performed by the supervisee. We have integrated this feature into userspace and currently make heavy use of this to intercept mknod(), mount(), and other syscalls in user ...
|
