Welcome to Kubemag

Hi, thanks for passing by! We are a new online publication focused on modern server computing. That means distributed systems, cloud, containers, virtualization and the like, from an operations as well as from a developer perspective. While technically not necessarily connected with this we also tak...


Docker Bench for Security checks security best practices

Docker Inc. has released the Docker Bench for Security under an Open Source license. "Inspired" by the CIS (Center for Information Security) Benchmark for Docker the shell script checks for common best-practices around deploying Docker containers in production.

Naturally Docker has also packed...


Red Hat to Acquire CoreOS

Red Hat today announced that it has signed a definitive agreement to acquire CoreOS, Inc. for a purchase price of $250 million. By combining CoreOS’s container and orchestration offerings such as Rocket, Quay or Tectonic with Red Hat’s Kubernetes and container-based portfolio, including OpenShift,...


Rook Storage becomes a CNCF project

Rook Storage is now an Inception Level Project of the Cloud Native Computing Foundation (CNCF). Rook provides file, block, and object storage in a Kubernetes cluster. This makes Kubernetes clusters independent of the underlying storage infrastructure and easier to migrate.

As a backend Rook uses t...


Kubernetes 1.10 Released

Kubernetes 1.10 is the first release of the container orchestration framework in 2018. This version stabilizes storage features and includes new features in security and networking. The Kubernetes implementation of the Container Storage Interface (CSI) moves to beta in this release: installing new v...


Envoy Proxy gets security audit

German security firm Cure53 has completed a security audit of the service mesh / proxy Envoy. A severe security hole was found in the Lyft web admin interface but no critical problems were found in the Envoy core. It's the first completed security audit that the Cloud Native Computing Foundation (CN...


CockroachDB 2.0 significantly improves performance

ACID-compliant distributed database CockroachDB is available as a 2.0 release. A new feature is the support for "semi-structured" data in the form of a JSON datatype. CockroachDB follows the PostgreSQL design by using the JSONB datatype introduced in recent versions of the relational database.



Deploy to Kubernetes Using Git Push (

For Heroku style deployments to Kubernetes: Gitkube is a tool for building and deploying docker images on Kubernetes using git push. Features according to the project page:


Kaniko builds container images in Kubernetes without privileges

Google has introduced Kaniko, an open-source tool for building container images from a Dockerfile even without privileged access. With Kaniko, it is possible build an image from a Dockerfile and push it to a registry. Users can run Kaniko in a standard Kubernetes cluster or the Google Kubernetes Eng...


gVisor: new container runtime with a sandbox

Google has released a new container runtime called gVisor which promises more security than conventional Linux containers, but requires less resources than a combination of container and VM (as in runV or Kata containers). To reach this goal the Google developers have re-implemented most of the Linu...


Google releases Kubeflow

After announcing Kubeflow in the beginning of December, Google has now released the machine learning framework for the Kubernetes orchestrator. The Kubeflow project can be found in a new open source Github repo that contains:


SAP releases Kubernetes Gardener

SAP has released an open source project called "Gardener", which allows Kubernetes clusters to be managed on multiple platforms. SAP has been working on the project since mid-2017 and hopes that more developers will attracted through the release of the software.

Gardener itself is a service runn...


Kata containers reach 1.0 milestone

Kata containers are available as a version 1.0. Kata containers are a project of the OpenStack Foundation which combines container technology with VMs for more security, using the existing Intel Clear container and projects. The project was presented at the end of 2017, and now, in time for...


Pulumi: new framework for cloud management

The startup Pulumi has released their eponymous cloud configuration framework under an open source license. Unlike similar tools like Terraform and Cloudformation, Pulumi does not rely on declarative configuration in a YAML syntax, but uses a proper programming language to configure cloud environm...


Google Kubernetes Engine on-premises

At their Cloud Next conference Google unveiled its new "GKE On-Prem" product, which makes their Kubernetes cloud service available for on-premises operation. This will enable the seamless integration of container applications in the cloud and in the enterprise. For example, the on-prem service also...


WireGuard going to be merged into Linux kernel

Wireguard developer Jason A. Donenfeld has submitted patches of his original VPN implementation to the Linux kernel. That and the fact that Linux kernel maintainer Linus Torvalds praises the quality of the design and the code means that Wireguard will soon be available in the mainline kernel.



Prometheus becomes second CNCF project to graduate

The Cloud Native Computing Foundation (CNCF) announced at the PromCon conference that Prometheus is the second project to "graduate", following Kubernetes. To move from the maturity level of incubation to graduation, projects must demonstrate thriving adoption, a documented, structured governance pr...


Google transfers Kubernetes stewardship to CNCF

Google hands over ownership and control of the Kubernetes container orchestration project to the Cloud Native Computing Foundation (CNCF). In the future, the CNCF and its community members will be be responsible for Kubernetes.

Google published Kubernetes 2014 and formally submitted it as a projec...


SUSE bids farewell to Docker

The Kubic project from SUSE now uses the container runtime CRI-O by default. This is the software component that creates a container environment from an image. Since the specification of the corresponding interface by the Open Container Initiative, other runtime environments implementing the Conta...


Kubespy: new tool for debugging Kubernetes

Pulumi, who released a new cloud application management framework in June, have published a small tool called Kubespy which monitors Kubernetes resources in real time.

It can monitor the status of resources such as pods and services as well as output the changes to such resources as diffs of JSON...


Platform9 open sources etcdadmin

Inspired by kubeadm, etcdadm provides a simple command-line experience to configure, deploy and operate secure etcd clusters that can run anywhere (on-premises, in the cloud, as well as in air-gapped environments) – with built-in support for recovery and scalability.

etcdadm provides:


PacBot: new tool for checking security best practices in the cloud

T-Mobile has released the new open source project PacBoot to help make computer systems safer through automated audits and compliance checks. The first PacBot release focuses on the security audit of Amazon AWS cloud setups. The tool can obtain data from Qualys Vulnerability Assessment Platform, Bit...


PostgreSQL 11 released

Version 11 of the PostgreSQL database management system is now available. The PostgreSQL developers focused on scaling up for large volumes of data in this release. This concerns, for example, the partitioning of databases, which is now faster and more robust, according to the release notes.



IBM acquires Red Hat

IBM and Red Hat announced today that the companies have reached a definitive agreement under which IBM will acquire all of the issued and outstanding common shares of Red Hat for $190.00 per share in cash, representing a total enterprise value of approximately $34 billion.

With this acquisition, I...


Stripe open-sources Skycfg, a configuration builder for Kubernetes

Skycfg is an extension library for the Starlark language (of Google's Bezel build tool) that adds support for constructing protobuf messages. Starlark is a dialect of Python. Like Python, it is a dynamically typed language with high-level data types, first-class functions with lexical scope, and ga...


VMware acquires Heptio

At the VMworld Europe in-house show VMware announced that it will acquire startup Heptio. Heptio deals exclusively with the container orchestration software Kubernetes and was founded by the Kubernetes inventors Joe Beda and Craig McLuckie who were employed at Google at the time. Later,Kubernetes wa...


HTTP/3 will be QUIC

According to Daniel Stenberg, the author of the commandline tool curl, the next version of HTTP will be based on the QUIC protocol. Originally, QUIC had been developed as a UDP-based alternative to TCP by Google. Based on this, the IETF experts are working on a different protocol under this name (...


Dive: a tool for exploring docker image layers

Dive is a command line gui tool that lets users explore the layers of a Docker image. The tool shows Docker image contents broken down by layer including changes in a specific layer or aggregated changes up to this layer.

Dive also provides a measure for what the developers call "image efficienc...


Envoy is now a CNCF graduate

The Envoy proxy has become the third project to "graduate" as a CNCF project, after the Kubernetes orchestration and the Prometheus monitoring software.

Envoy was developed by the carsharing startup Lyft and donated to the CNCF in 2017. It is a proxy as well as a "service mesh" for microservi...


Amazon releases Firecracker VM

AWS has released a new virtualization software called Firecracker that is aimed at serverless applications. According to Amazon it is already running in production on the AWS Lambda and Fargate services.

Firecracker is based on the Linux hypervisor KVM and optimzed for efficiency and security....


Privilege escalation security hole in Kubernetes

Darren Shepherd of Rancher Labs has found a severe security vulnerability in Kubernetes.

The vulnerability allows specially crafted requests to establish a connection through the Kubernetes API server to backend servers (such as aggregated API servers and kubelets), and send arbitrary requests...


TiDB 2.1 released

PingCAP, developers of the "NewSQL" database TiDB, have announced the general availability of TiDB 2.1. It's a Hybrid Transactional and Analytical Processing (HTAP) database that provides elastic horizontal scalability, strong consistency and high availability. TiDB has a MySQL-compatible interfac...


Microsoft introduces Cloud Native Application Bundle (CNAB)

Deis Labs have published the specification of the new Cloud Native Application Bundle (CNAB) format. Its purpose is to help bundling, installing and managing container-native apps and their respective services.

Applications specified through CNAB will be cloud-agnostic and secured through the u...


CNCF adopts etcd

The Cloud Native Computing Foundation (CNCF) has adopted the key-value store etcd that is a central (albeit distributed) component of Kubernetes. etcd has been developed by the CoreOS company that has been acquired by Red Hat in early 2018. It's a distributed key-value store similar to Apache Zookee...


Bitnami presents Kubernetes Production Runtime

Bitnami has published its Kubernetes Production Runtime (BKPR), a bundle of the Kubernetes orchestration software and other services that are typically needed when operating a Kubernetes cluster, such as logging, monitoring, certificate management and automatic discovery of Kubernetes resources vi...


Tumblr opensources some Kubernetes utilities

According to their announcement blog post Tumblr have been using Kubernetes for many tasks such as critical-path web requests handling for or background and scheduled jobs. Now the are releasing three of their Kubernetes Tools under an open source license.

Their sidecar connector can...


Podman 1.0 can run Kubernetes pods

The Podman command line container management tool has reached version 1.0. The tool implements an almost Docker-compatible command line but uses that CRI-O container runtime. Originally it was developed as a test tool for CRI-O but has since then become a full container engine.

In addition to t...


Root escalation bug in runc

A bug was found in the way the runc container runtime handles file descriptors when running containers. An attacker could use this bug to overwrite contents of the runc binary and run arbitrary commands on the container host with root privileges. To exploit this flaw the attacker needs to be able to...


Containerd graduates within CNCF

Containerd is the fifth project to graduate within the CNCF (Cloud Native Computing Foundation) ecosystem, following Kubernetes, Prometheus, Envoy, and CoreDNS. To move from incubation status to graduation, projects must demonstrate "thriving adoption, diversity, a formal governance process,...


Purism introduces PureBoot high security boot process

Purism, makers of the Librem notebooks and smartphone, have introduced a secure boot mechanism that covers the whole chain of booting a device into the operating system. PureBoot comprises the following measures:


Red Hat launches Operator Hub for Kubernetes

Together with AWS, Google Cloud and Microsoft the open source company Red Hat is launching, a new public registry for finding Kubernetes Operators.

Introduced by CoreOS in 2016 the Operator pattern is a way to automate infrastructure and application management tasks on Kubernetes o...


Multistage builds on OpenShift 3.11

While working with OpenShift I did some research on multistage builds and stumbled upon a GitHub issue where people claimed that multistage builds on OpenShift actually worked and wondered why that was the case because OpenShift gets installed with Docker 1.13 and multi-stage builds were only intr...


K3S is a lightweight Kubernetes alternative

Initiated by the folks of Rancher Labs there's a new stripped-down version of Kubernetes called K3S that is targeted to edge deployments with low resources or other installations which require lower operational complexity than plain Kubernetes. The name of the project is a play on the K8S, the usual...


Kubernetes 1.14 released

The first Kubernetes 1.14 in 2019 is ready. Version 1.14 comprises of 31 enhancements: 10 moving to stable, 12 in beta, and 7 new. The main themes of this release are extensibility and supporting more workloads on Kubernetes with three major features moving to general availability, and an important...


Cloudflare implements Wireguard VPN in Rust

BoringTun is an implementation of the WireGuard protocol designed for portability and speed. The executable "boringtun" is a userspace WireGuard implementation for Linux and macOS. The library "boringtun" can be used to implement fast and efficient WireGuard client apps on various platforms, incl...


Fluentd is now a CNCF graduate

The Cloud Native Computing Foundation (CNCF) announced that Fluentd is its sixth project to "graduate", following Kubernetes, Prometheus, Envoy, CoreDNS and containerd. Where "graduation" means that a project has reached a certain stage the encompasses that it has completed an independent and third...


WireGuard comes to Kubernetes

Gravitational has ported WireGuard to Kubernetes, that is to say that they created a network plugin for Kubernetes that uses the WireGuard VPN. It's an open source project called Gravitational Wormhole that can be found on GitHub.

The Kubernetes API is used to for the exchange of encryption key...


Rook Storage reaches 1.0

The Rook storage distribution on top of Kubernetes has been released in version 1.0 that the developers consider a "major milestone".

Rook, that is basically a containerized version of the distributed storage software Ceph, now supports the latest development release "Nautilus" of Ceph. It sill...


GitHub starts Package Registry

GitHub has announced the beta launch of a new package registry for different formats such as npm, Maven, Nuget, RubyGems and Docker. After the free beta the terms of use are the same as with GitHub repositories: free for open source projects and different plans for commercials users. Prices have n...


Intel updates Clear Linux

Intel has released a new version of its Clear Linux distribution. While Clear Linux was initially branded as a distribution for cloud computing the current message is now that it is a distribution targeted at Linux developers. Still Clear Linux includes special machinery for working with containers....


WireGuard arrives at OpenBSD

The WireGuard VPN tool has been imported into the OpenBSD ports software collection. That means WireGuard can be easily installed by OpenBSD users.

WireGuard is a new implementation of a VPN that is much easier to configure than OpenVPN or IPsec. Since it has been included in the Linux kernel i...


TiKV becomes a CNCF project

The TiKV distributed transactional key-value database is now an incubating project at the CNCF (Cloud Native Computing Foundation). TiKV is a distributed database that's similar to Google Spanner and HBase but claims to be easier to use. TiKV offers georeplication, horizontal scalability and consi...


IBM goes all in with OpenShift

Following the Red Hat acquisition IBM has announced that its software portfolio will be adapted to run on the OpenShift container platform. By now IBM has created more than 100 so called Cloud Paks that are optimized to run on Red Hat OpenShift which is a customized Kubernetes platform focused on us...


Kubernetes security has "room for improvement"

The CNCF (Cloud Native Computing Foundation) has published the results of an "open source security audit" of the Kubernetes container orchestration framework. The actual results and reports are accessible in a public GitHub repository. Live testing Kubernetes environments were setup with Kops an...