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CoreOS Blog

What it means to work on securing the internet: My time working on Container Linux

January 26, 2017 · By Matthew Garrett

This post is by CoreOS principal security engineer, Matthew Garrett, known for his work in the open source security community. We wish him well in his next endeavor.

CoreOS was founded around a simple idea - the security of the internet can be improved by making it easier and faster to update software. Automated image based updates get patched versions of the OS into people’s hands seamlessly, and the combination of containers and features like Clair allows admins to prioritise updates to critical components without worrying about them breaking less security-sensitive ones while using container-based isolation to reduce the impact of vulnerabilities that do exist.

During my time here at CoreOS we’ve furthered that security by incorporating existing features such as SELinux and Seccomp that are typical around security-oriented Linux distributions. But we’ve also brought in features like dm-verity, making it impossible for attackers to modify the underlying filesystem containing the OS - features that have otherwise not been present in server products. We’ve become the first operating system on the planet to provide known-good TPM measurements for the operating system, and the first container runtime to support TPM-based measurement of individual containers to provide a tamper-proof audit trail of every container run on a system. We’ve even written support for automated detection of a wide range of privilege escalation attacks in containers.

I’m incredibly proud to have been part of a team that’s kept up with much larger organisations while simultaneously developing innovative new security features. As we’ve seen in recent months, internet security isn’t just about compromised credit cards any more - it has the potential to shape the future of entire countries. The CoreOS model of making things as secure as possible by default, of getting security fixes into deployment as quickly as possible, and of making it easier to determine whether or not a system has been compromised will be critical to avoiding the same kind of security failings that we’ve seen so frequently in the past.

But the security of servers and services is only part of the puzzle, and the security of client systems is just as critical. My passion has always been the security and safety of end-users, and so I’ve taken the incredibly difficult decision to leave CoreOS to work on client system security.

CoreOS is in a unique position to do meaningful security work and get it into production rapidly; and I'm proud to have been part of that team that has brought meaningful security improvements to users. Even though I am leaving CoreOS I’ll still be participating in open source development and introducing new exciting security features to the ecosystem. The beauty of collaborative development is that CoreOS will continue to benefit from my work, just as I (and the rest of the internet) will continue to benefit from theirs.

Cryptographically Verifying Container Linux at Runtime

January 26, 2017 · By Matthew Garrett

Container Linux by CoreOS ships dm-verity, a technology that builds on trusted boot and secure boot to make it impossible for attackers to modify the underlying filesystem containing the OS. This security mechanism is enabled by default, helping ensure that the whole system is in a trustworthy state.

A core part of Container Linux is the automated image-based update strategy. Each Container Linux install has three partitions that are used by the OS:

  • ROOT, which contains local configuration and data and is mounted at /. If this partition is wiped it will be automatically restored to the initial configuration, making it easy to perform a “factory reset” of Container Linux systems.

  • USR-A, which contains the operating system itself and is mounted at /usr. This contains the initial version of the operating system after install.

  • USR-B, which is initially blank. On system update, the new version of the OS is written to USR-B. On post-update reboot, it will be used as /usr instead of USR-A, and the next update will be written to USR-A instead.

Since all local configuration and data is stored in /, and since updates are written out to a separate partition, this means that there’s no need for /usr to be modified at runtime. In fact, the filesystem is explicitly configured such that the kernel will only permit it to be mounted read-only. However, this does nothing to protect against out-of-band modification such as writing directly to the partition. This is where dm-verity comes in.

What is dm-verity

dm-verity is a Linux kernel feature originally developed by Google as part of the Chrome OS project. It interfaces with the kernel’s Device Mapper layer, which allows code to be interposed between the underlying block device (in this case the /usr partition) and the filesystem layer’s view of the partition. When a filesystem is created with dm-verity, each block of the filesystem is hashed and a tree of those hashes stored. Whenever a block is read from the underlying block device, dm-verity ensures that it hashes to the stored value before passing it to the filesystem layer. If the hash doesn’t match, an I/O error is returned instead. As a consequence, any filesystem modifications will generate errors.

For this to be secure, dm-verity also needs to be able to verify that the stored hashes have not themselves been tampered with. This is achieved by storing a root hash and passing that to the kernel when setting up dm-verity at runtime. If any hashes have been modified, they will fail to match the root hash and again an error will be generated.

But what secures the root hash?

We chose to place the root hash inside the kernel image itself, which allows it to be protected by either Trusted Boot or Container Linux’s forthcoming UEFI Secure Boot support. The bootloader extracts the hash after verifying or measuring the kernel and passes it on the kernel command line, allowing it to be used during dm-verity setup. For this to be possible, the root hash has to be stored in the uncompressed region of the kernel. We do this by taking advantage of an interesting historical quirk.

In the early days of the kernel, a kernel image could be written directly to a floppy disk and booted from the firmware. This was achieved by embedding a small bootloader in the kernel’s setup code. As time passed, this became less useful (kernels got too big to fit on floppies, and floppy drives pretty much vanished) and the code was removed. However, in order to alert anybody who was used to this functionality, a stub was added that simply prints:

Use a bootloader

Remove disk and press any key to reboot…

This string is not used in any other part of the boot process. It is also (including newline characters) exactly 64 bytes long. This is, conveniently, the length of an ascii-encoded dm-verity root hash. The hash is generated during OS build and embedded in the kernel before the kernel is signed and its measurements calculated.

Trustworthiness with dm-verity enabled in Container Linux

This ensures that the root hash cannot be tampered with, and allows users to have a high level of certainty in the trustworthiness of their /usr filesystems. We’ve been shipping with dm-verity enabled by default since the 1214.0 release, providing additional security in an entirely transparent manner. This is enabled by default and should be entirely transparent to users, but file an issue if it appears to cause any problems.

If you are interested in learning more about Container Linux in general, join a live webinar about Staying Ahead of Vulnerabilities with Automatic Updates in Container Linux on January 26 at 9:15 a.m. PT, or watch it any time after.

The Future of Kubernetes in 2017

January 25, 2017 · By Alex Polvi

2017 is the year Kubernetes becomes the backbone of distributed systems. In 2016, the Kubernetes community greatly expanded as more people understood the potential of container orchestration.

Premiered at Tectonic Summit 2016, learn more about how the industry is viewing the future of Kubernetes.


As the community of users has grown, so has the number of people and organizations who contribute to the project, overall increasing the capabilities of Kubernetes.

As it continues to gain popularity and widespread use, Kubernetes is blending into the background as the de facto infrastructure powering distributed systems. With CoreOS Tectonic, the first self-driving Kubernetes solution, Kubernetes customers no longer have to focus on their infrastructure and can instead focus on innovating.

This year, the industry will unify behind Kubernetes, Kubernetes technology will stabilize, and Kubernetes will become ubiquitous. By this time next year, we believe the industry will be more focused on the technology that can be built on Kubernetes than Kubernetes itself.

A unified industry push towards Kubernetes

As an industry, we will continue to push Kubernetes forward. Even companies competing in this market will work together to improve the technology towards our shared vision of what the Kubernetes ecosystem looks like. It’s like we’re all inventing an iPhone together: a powerful platform that enables us to build new kinds of app companies. We can’t wait to see what inventive companies will emerge as Kubernetes becomes the standard for infrastructure deployments.

Upleveling the conversation: Kubernetes will get boring as the technology stabilizes as plumbing

Instead of adding features to Kubernetes, development will focus on ease of use, stability, and scalability. This is crucial for enterprise adoption, as this shift in focus will provide the stability needed for large-scale production deployments. This is a necessity for Kubernetes to become the plumbing of distributed systems.

Kubernetes becomes ubiquitous

Kubernetes, as an open source project, has two major advantages: industry momentum, and excellent technology. Kubernetes has enough momentum that it is a force on its own, maintained by a non-partisan community and governing body (under the Cloud Native Computing Foundation). We’ve seen this before with OpenStack, which is now a major player in the infrastructure market.

Second, the technology is solid and tested by internet giants. Born out of Google and based on Google’s Borg technology, Kubernetes is the way hyperscale giants run their distributed systems, and they do it with great success. To go back to the iPhone metaphor: there were smartphones before the iPhone, but the iPhone nailed it in a very special way that changed the way the world interacts with technology on a fundamental level. Similarly, Kubernetes will revolutionize the way we run infrastructure and enable a host of new technologies and applications.

Post-Kubernetes companies will emerge

We’ll see the first set of “post-Kubernetes” companies emerge: ones that are building tech that assumes Kubernetes at their core. These are products that are built just on Kubernetes, like the Operators we’re developing at CoreOS. Deis Workflow is an example of a Kubernetes-first app, as are the “serverless” systems emerging around Kubernetes. These are all apps that become wildly easier to build because of Kubernetes. The Uber of distributed computing will emerge thanks to Kubernetes.

In 2017, we look forward to working with you in the Kubernetes community to make Kubernetes the ubiquitous technology for self-driving infrastructure, as well as working with your business to help you benefit from all that Kubernetes has to offer.

CoreOS announces self-driving Kubernetes with Tectonic

Announcing etcd 3.1

January 20, 2017 · By Anthony Romano

A new year and a new milestone release of etcd. Hot on the heels of 17 bugfix releases to etcd 3.0, two alphas, and two release candidates, the etcd team is proud to announce etcd 3.1. This edition of etcd features performance, reliability, and API enhancements over the 3.0 series. It also introduces the first iteration of the etcd v3 gRPC proxy, a smart proxy for offloading client requests away from the core cluster.

Fast linearized reads

etcd provides both serialized and linearized consistency models for reading keys. A serialized read is fast, no consensus is necessary, but unsuitable for many applications because it may return stale data. A linearized read returns the most recent keys by going through etcd’s underlying raft protocol, and therefore carries greater overhead. While etcd 3.0 processes linearized reads through direct raft proposals, chewing precious disk bandwidth and incurring the corresponding latency penalty, linearized reads in 3.1 issue idempotent, fsync-free linearized raft index requests. These index requests are also batched; concurrent linearized reads coalesce into a single index request. The upshot is linearized reads have lower latency and better throughput.

The graph below, based on quick measurements from a laptop with the etcd benchmark tool, illustrates the improvement as concurrency increases. The linearized read implementation in 3.1 clearly outperforms 3.0 linearized reads given little concurrency and rapidly reaches its maximum throughput. These quick measurements are here to give a sense of the overall trend of these improvements, and we have deliberately redacted specific numbers since only relative trends matter here. We have an in-depth benchmarking series, with rigorous benchmarks, coming soon.

Read Throughput over Concurrency
Read Throughput over Concurrency

Availability and Reliability

In the past, upgrading an etcd cluster meant temporarily losing the leader and therefore a brief loss of availability. If an etcd member needed to be taken offline, when upgrading for example, and if it was the cluster leader, then the cluster followers would timeout on that leader and initiate an election. Waiting for a new leader would cause a short cluster outage. To improve availability in this case, the leader will automatically transfer its leadership to another member before going offline.

The quorum-based consensus for etcd has a drawback in that permanent quorum loss permanently downs the cluster. To avoid instances of operator error which inflict quorum loss on the cluster, etcd now by default checks member health before reconfiguring cluster membership. These checks use peer liveness information to ensure membership changes are safe. A member removal request is rejected if the removal causes quorum loss when considering how many members are active. A member add request is rejected if quorum would be lost if the new member never joins the cluster, in case the member is configured with a bad address.

New APIs

Based on user feedback, the etcd v3 API now includes features to better manage leases, efficiently process keys by revision, and reduce total round-trips. Leases now support non-destructive TTL fetches, useful for checking the time left on a lease, and listing attached keys, useful for finding all resources attached to a session. Key range requests can specify minimum and maximum modification and creation revisions, useful when monitoring wait lists for distributed locks and elections. Watches can optionally return the old key value on delete events, saving the cost of a round trip.

The etcd v3 authentication API, which was alpha in the 3.0 series, is now stable; any future change to the authentication API will not break older etcd v3 clients. The role-based authentication model is similar to the one found in etcd v2 API. The major differences include authentication tokens, a much faster mechanism than etcd v2’s per-request bcrypt calls, and permissions governed by key range intervals, instead of only key prefixes like in etcd v2.

Introducing gRPC proxy

An etcd cluster replicates its data to all its members. The overhead from this replication counterintuitively causes an etcd cluster to slow down, instead of scaling, after adding more members. This performance loss fixes the number of members to the desired fault tolerance; scaling must be achieved through other means. The new etcd gRPC proxy aims to reduce the amount of load on the core etcd cluster through caching and request coalescing.

The gRPC proxy includes a cache of recently accessed keys. The cache serves serialized key fetches, which don’t need to go through consensus, that would otherwise be handled by a cluster member. The advantage is the proxy absorbs serialized key request spam from misbehaving or misconfigured clients. The graph below shows the effect of this cache on repeatedly fetching the same key until CPU saturation; it effectively eliminates CPU load on the etcd server.

Proxy versus Unproxied CPU Utilization
Proxy versus Unproxied CPU Utilization

The proxy also coalesces watches from many clients into a single watch stream. This coalescing conserves total open connections to the cluster and reduces overall network traffic from the cluster by deferring event fan-out to the proxy.

Learn more

The latest and greatest etcd developments can be found in the etcd github repository. The project also hosts signed binaries for 3.1.0 and historical releases on the etcd release page. The github repository also has the most up-to-date etcd documentation.

As always, the etcd team is committed to building the best distributed consistent key-value store; feel free to report any bugs, ask questions, or make suggestions on the etcd issue tracker.

Older Posts

Announcing CoreOS Fest 2017

January 19, 2017 · By Jim Walker

Toward etcd v3 in CoreOS Container Linux

January 13, 2017 · By Josh Wood

RunC Exec Vulnerability (CVE-2016-9962)

January 10, 2017 · By Alex Crawford

Upcoming CoreOS events: ShmooCon, FOSDEM, Container World, and more

January 9, 2017 · By Johan Philippine

Testing distributed systems in Go

January 6, 2017 · By Gyu-Ho Lee

Introducing rkt’s ability to automatically detect privilege escalation attacks on containers

December 15, 2016 · By Matthew Garrett

Containers to Clusters: Advancing Kubernetes, etcd, and more at CoreOS

December 13, 2016 · By Brandon Philips

What Kubernetes users should know about the rkt container engine

December 13, 2016 · By Jonathan Boulle

Self-Driving Kubernetes, Container Linux by CoreOS and Kubernetes 1.5

December 12, 2016 · By Alex Polvi

Your guide to Tectonic Summit 2016

December 5, 2016 · By Johan Philippine

The easiest way to get up and running with Kubernetes on AWS

November 29, 2016 · By Mackenzie Burnett

Enterprise Kubernetes Experts To Unite at Tectonic Summit 2016

November 14, 2016 · By Melissa Smolensky

CoreOS Kubernetes Community Citizenship

November 7, 2016 · By Melissa Smolensky

Introducing Operators: Putting Operational Knowledge into Software

November 3, 2016 · By Brandon Philips

Introducing the etcd Operator: Simplify etcd cluster configuration and management

November 3, 2016 · By Hongchao Deng

The Prometheus Operator: Managed Prometheus setups for Kubernetes

November 3, 2016 · By Fabian Reinartz

November community events: Meet us at KubeCon and other conferences

November 2, 2016 · By Johan Philippine

Tectonic 1.4 ships with self-hosted cluster installers and RBAC integration

November 1, 2016 · By Mackenzie Burnett

KubeCon Preview

October 31, 2016 · By Johan Philippine

OpenStack on Kubernetes: Announcing the Stackanetes Technical Preview

October 26, 2016 · By Quentin Machu

Kubernetes: Critical Security Bug in TLS Client Auth

October 20, 2016 · By Brandon Philips

Linux kernel has been Updated (CVE-2016-5195)

October 20, 2016 · By Alex Crawford

Tectonic Summit: First Round of Speakers and Sponsors

October 17, 2016 · By Melissa Smolensky

CoreOS and Redspread Join to Extend Kubernetes

October 17, 2016 · By Alex Polvi

October community events - LinuxCon, OpenStack Summit, All Things Open, and more

October 3, 2016 · By Johan Philippine

Eliminating Delays From systemd-journald, Part 2

September 29, 2016 · By Vito Caputo

Upstream Kubernetes 1.4 Preview: Features to know about for the security focused

September 22, 2016 · By Caleb Miles

Kubernetes in Minutes with Minikube and rkt Container Engine

September 21, 2016 · By Sergiusz Urbaniak

How to use pluggable isolation features in the rkt container engine

September 16, 2016 · By Derek Gonyeo

Tectonic expands supported base Operating Systems to include CentOS and RHEL

September 15, 2016 · By Ed Rooth

rkt Container Engine Reaches v1.14.0: Focus on Stability and Minimalism

September 9, 2016 · By Luca Bruno

Announcing Tectonic Summit 2016 - Request your invite today

September 7, 2016 · By Melissa Smolensky

September community events - meetups, recruitment, and conferences

September 2, 2016 · By Johan Philippine

Kubernetes: A Solution for Enterprise-level Continuous Integration Scalability and Elasticity

September 2, 2016 · By Aleks Saul

Serializability and Distributed Software Transactional Memory with etcd3

August 31, 2016 · By Anthony Romano

Fetching and running docker container images with rkt

August 25, 2016 · By Derek Gonyeo

Developing Prometheus alerts for etcd

August 24, 2016 · By Frederic Branczyk

CoreOS Online Validator Now Supports Ignition

August 15, 2016 · By Andrew Jeddeloh

Announcing Tectonic 1.3 with new enterprise-grade tools and features for Kubernetes

August 11, 2016 · By Ed Rooth

Announcing Public and Private Kubernetes and CoreOS Training

August 11, 2016 · By Jeff Gray

Intro to rkt signing and verification

August 10, 2016 · By Derek Gonyeo

Meet CoreOS in August: OpenStack, ContainerCon and more

August 8, 2016 · By Johan Philippine

Sharing Servers for International Friendship Day

August 7, 2016 · By Jason Luce, ScaleFT

Self-Hosted Kubernetes makes Kubernetes installs, scaleouts, upgrades easier

August 5, 2016 · By Josh Wood

August spotlight: Learn about rkt, the container engine by CoreOS

August 4, 2016 · By Derek Gonyeo

Hands on: Monitoring Kubernetes with Prometheus

August 3, 2016 · By Joe Bowers

Migrating applications, clusters, and Kubernetes to etcd v3

July 27, 2016 · By Hongchao Deng

Kubernetes Cluster Federation: Efficiently deploy and manage applications across the globe

July 21, 2016 · By Colin Hom

GIFEE: Bringing Security-minded Container Infrastructure to the Enterprise

July 12, 2016 · By Alex Polvi

GopherCon, ContainerCon and more! Meet CoreOS at a July event

July 11, 2016 · By Johan Philippine

Happy three years, CoreOS

July 1, 2016 · By Brandon Philips

etcd3: A new etcd

June 30, 2016 · By Anthony Romano and Xiang Li

Prometheus and Kubernetes up and running

June 27, 2016 · By Fabian Reinartz

CoreOS Linux available in China

June 16, 2016 · By Alex Crawford

CoreOS Recognized in IDC and Industry Awards

June 10, 2016 · By Kelly Tenn

Kubernetes v1.3 Preview - Auth, Scale, and Improved Install

June 7, 2016 · By Mike Saparov

June CoreOS Events

June 2, 2016 · By Johan Philippine

Presenting Torus: A modern distributed storage system by CoreOS

June 1, 2016 · By Barak Michener

Security brief: CoreOS Linux Alpha remote SSH issue

May 19, 2016 · By Matthew Garrett

Major Remote SSH Security Issue in CoreOS Linux Alpha, Subset of Users Affected

May 16, 2016 · By CoreOS Security Team

CoreOS Fest: CoreOS Works with Intel, Project Calico, Packet, and StackPointCloud to extend GIFEE

May 9, 2016 · By Alex Polvi

CoreOS closes $28M Series B to bring Google-like infrastructure to all

May 9, 2016 · By Alex Polvi

CoreOS brings open source distributed systems components to the next level

May 9, 2016 · By Brandon Philips

What to know before you go to CoreOS Fest, and other events this May

May 5, 2016 · By Johan Philippine

CoreOS and Prometheus: Building monitoring for the next generation of cluster infrastructure

April 29, 2016 · By Fabian Reinartz

Introducing Stackanetes – Running OpenStack as an application on Kubernetes with CoreOS Tectonic

April 26, 2016 · By Wei Lien Dang

Tectonic 1.2 available with increased scalability and new namespace tools

April 15, 2016 · By Joe Bowers

Celebrating the Open Container Initiative Image Specification

April 14, 2016 · By Jonathan Boulle

Introducing Ignition: The new CoreOS machine provisioning utility

April 12, 2016 · By Alex Crawford

rkt 1.3.0: Tighter security; easier container debugging, development, and integration

April 6, 2016 · By Derek Gonyeo

Meet us for our April 2016 events

April 5, 2016 · By Johan Philippine and Kelly Tenn

How OpenStack and Kubernetes Come Together with CoreOS' Tectonic

March 31, 2016 · By Alex Polvi

CoreOS Fest Berlin and San Francisco: Join us this May

March 28, 2016 · By Melissa Smolensky

CoreOS Linux Hits Day 1000

March 28, 2016 · By Brandon Philips

CoreOS Delivers etcd v2.3.0 with Increased Stability and v3 API Preview

March 21, 2016 · By Xiang Li

CoreOS Delivers on Security with v1.0 of Clair Container Image Analyzer

March 18, 2016 · By Quentin Machu

Your Journey to #GIFEE, An Option for Every Level

March 10, 2016 · By Ed Rooth

Eliminating Delays From systemd-journald, Part 1

March 10, 2016 · By Vito Caputo

March CoreOS Events

March 7, 2016 · By Elsie Phillips

LDAP Support in CoreOS dex: An Open Source Journey

March 3, 2016 · By Frode Nordahl

CoreOS and the Trusted Computing Group

February 26, 2016 · By Matthew Garrett

Take a REST with HTTP/2, Protobufs, and Swagger

February 24, 2016 · By Brandon Philips

Improving Kubernetes Scheduler Performance

February 22, 2016 · By Hongchao Deng

Finance is Embracing "Invisible Infrastructure"

February 19, 2016 · By Rob Szumski

rkt Network Modes and Default CNI Configurations

February 9, 2016 · By Stefan Junker

February Community Events

February 8, 2016 · By Elsie Phillips

The Security-minded Container Engine by CoreOS: rkt Hits 1.0

February 4, 2016 · By Alex Polvi

Get Started with rkt Containers in Three Minutes

February 4, 2016 · By Derek Gonyeo

OpenSSL patched in CoreOS Alpha, Beta and Stable

February 1, 2016 · By George Tankersley

NTP has been Updated

January 22, 2016 · By Alex Crawford

A Bare Metal Configuration Service for CoreOS Linux

January 22, 2016 · By Dalton Hubble

Get Ready for CoreOS Fest 2016: Berlin

January 20, 2016 · By Melissa Smolensky

Meet CoreOS In Your Neck of the Woods

January 20, 2016 · By Kelly Tenn

Linux Kernel has been Updated (CVE-2016-0728)

January 20, 2016 · By Alex Crawford

CoreOS rkt 0.15.0 Introduces rkt fly, Go 1.5 Build Support

January 19, 2016 · By Josh Wood

Go 1.5.3 Security Vulnerability Patch

January 13, 2016 · By George Tankersley

Tectonic 1.1 is here! Updated Kubernetes Support to Deploy, Manage and Secure your Containers

January 5, 2016 · By Ed Rooth

What Trusted Computing Means to Users of CoreOS and Beyond

December 10, 2015 · By Matthew Garrett

A Tectonic Summit Wrap Up

December 8, 2015 · By Melissa Smolensky

Making Sense of Container Standards and Foundations: OCI, CNCF, appc and rkt

December 8, 2015 · By Alex Polvi

Tectonic Pre-Installed: Next Generation Infrastructure Delivered to Your Data Center

December 2, 2015 · By Melissa Smolensky

Tectonic Provides Cryptographic Chain of Trust from Application Layer to Hardware, Turns DRM on its Head

December 2, 2015 · By Alex Polvi

Meet CoreOS in New York This Week

December 1, 2015 · By Kelly Tenn

CoreOS Introduces Clair: Open Source Vulnerability Analysis for your Containers

November 13, 2015 · By Quentin Machu

Tectonic, by CoreOS, Is GA

November 3, 2015 · By Brandon Philips

November Events for CoreOS

November 2, 2015 · By Alex Avritch

International Securities Exchange, Morgan Stanley, SoundCloud, Viacom, Verizon Labs and More to Speak at Tectonic Summit 2015

October 29, 2015 · By Melissa Smolensky

rkt v0.10.0: With a New API Service and a Better Image Build Tool

October 27, 2015 · By Alban Crequy

October Events for CoreOS

October 5, 2015 · By Alex Avritch

Start Using Kubernetes on AWS with the Official Tectonic AWS Integration

October 2, 2015 · By Alex Polvi

Official CloudFormation and kube-aws tool for installing Kubernetes on AWS

October 2, 2015 · By Brian Waldon

Container Security with SELinux and CoreOS

September 29, 2015 · By Matthew Garrett

Announcing Tectonic Open Preview

September 22, 2015 · By Alex Polvi

Cross-host Container Communication with rkt and flannel

September 21, 2015 · By Eugene Yakubovich

Official Kubernetes on CoreOS Guides and Tools

September 17, 2015 · By Aaron Levy

Where systemd and Containers Meet: Q&A; with Lennart Poettering

September 16, 2015 · By Jonathan Boulle

etcd 2.2 – Improving the Developer Experience and Setting the Path for the v3 API

September 10, 2015 · By Xiang Li

September Events for CoreOS: Conferences, Trainings and More

September 8, 2015 · By Alex Avritch

Announcing dex, an Open Source OpenID Connect Identity Provider from CoreOS

September 3, 2015 · By Bobby Rullo

Flocker on CoreOS Linux

September 1, 2015 · By Brandon Philips

Containers on the Autobahn: Q&A; with Giant Swarm

August 24, 2015 · By Kelly Tenn

What it’s like to Intern with CoreOS

August 21, 2015 · By Mary O’Brien

Using Virtual Machines to Improve Container Security with rkt v0.8.0

August 18, 2015 · By Brandon Philips

Introducing the Kubernetes kubelet in CoreOS Linux

August 14, 2015 · By Kelsey Hightower

CoreOS and Mirantis are working together to deliver Tectonic on OpenStack

August 6, 2015 · By Brian Redbeard

Meet the CoreOS team around the world in August

August 4, 2015 · By Kelly Tenn

Announcing new Quay.io Enterprise features by CoreOS

July 28, 2015 · By Joey Schorr

Introducing etcd 2.1

July 24, 2015 · By Yicheng Qin

Introducing Kubernetes Workshops and Tectonic Summit

July 21, 2015 · By Melissa Smolensky

CoreOS and Kubernetes 1.0

July 21, 2015 · By Brandon Philips

Try out Kubernetes 1.0 with the Tectonic Preview

July 21, 2015 · By Alex Polvi

Meet CoreOS at OSCON and more

July 17, 2015 · By Kelly Tenn

Announcing rkt v0.7.0, featuring a new build system, SELinux and more

July 15, 2015 · By Iago López Galeiras

Q&A with Sysdig on containers, monitoring and CoreOS

July 14, 2015 · By Kelsey Hightower

How to get involved with CoreOS projects

July 10, 2015 · By Jed Smith

OpenSSL has been Updated (CVE-2015-1793)

July 10, 2015 · By Alex Crawford

Happy 2nd Epoch CoreOS Linux

July 7, 2015 · By Brandon Philips

Upcoming CoreOS Events in July

July 6, 2015 · By Alex Avritch

Under The Hood of Tectonic

July 1, 2015 · By Brian Waldon

Introducing flannel 0.5.0 with AWS and GCE

June 30, 2015 · By Mohammad Ahmad

App Container and the Open Container Project

June 22, 2015 · By Alex Polvi

CoreOS recognized in SD Times, AlwaysOn and more industry awards

June 16, 2015 · By Kelly Tenn

Technology Preview: CoreOS Linux and xhyve

June 11, 2015 · By Brian Akins

Tectonic Meets Nutanix

June 10, 2015 · By Kelsey Hightower

etcd2 in the CoreOS Linux Stable channel

June 9, 2015 · By Alex Crawford

Building and deploying minimal containers on Kubernetes with Quay.io and wercker

June 3, 2015 · By Micha "mies" Hernandez van Leuffen

Oh, the places we’ll be in June

June 2, 2015 · By Kelly Tenn

Tectonic Demos at Google I/O

May 28, 2015 · By Ed Rooth

CoreOS Linux is in the OpenStack App Marketplace

May 19, 2015 · By Brian Harrington

CoreOS at OpenStack Summit 2015

May 18, 2015 · By Alex Avritch

CoreOS Featured with Industry Honors

May 15, 2015 · By Kelly Tenn

New Functional Testing in etcd

May 14, 2015 · By Yicheng Qin

Upcoming CoreOS Events in May

May 12, 2015 · By Alex Avritch

Intel Brings Tectonic to Supermicro Systems

May 5, 2015 · By Alex Polvi, CEO of CoreOS

CoreOS State of the Union at CoreOS Fest

May 5, 2015 · By Brandon Philips

New Quay features: Enterprise-class deployment infrastructure for building container-based systems

May 4, 2015 · By Jake Moshenko

App Container spec gains new support as a community-led effort

May 4, 2015 · By Alex Polvi

CoreOS Fest 2015 Guide

April 29, 2015 · By Alex Avritch

Announcing GovCloud support on AWS

April 27, 2015 · By Mike Marineau

rkt 0.5.4, featuring repository authentication, port forwarding and more

April 24, 2015 · By Jonathan Boulle

CoreOS, Inc. and Tectonic making waves in the industry analyst community

April 22, 2015 · By Kelly Tenn

VMware Ships rkt and Supports App Container Spec

April 20, 2015 · By Alex Polvi

etcd 2.0 in CoreOS Alpha Image

April 16, 2015 · By Alex Crawford

CoreOS on ARM64

April 14, 2015 · By Geoff Levand

Counting Down to CoreOS Fest on May 4 and 5

April 13, 2015 · By Kelly Tenn

Upcoming CoreOS Events in April

April 7, 2015 · By Alex Avritch

Announcing Tectonic: The Commercial Kubernetes Platform

April 6, 2015 · By Alex Polvi

Announcing rkt v0.5, featuring pods, overlayfs, and more

April 1, 2015 · By Jonathan Boulle

CoreOS Fest 2015 First Round of Speakers Announced

March 27, 2015 · By Alex Avritch

What makes a cluster a cluster?

March 20, 2015 · By Barak Michener

Announcing rkt and App Container 0.4.1

March 13, 2015 · By Brandon Philips

rkt Now Available in CoreOS Alpha Channel

March 12, 2015 · By Michael Marineau

The First CoreOS Fest

March 11, 2015 · By Melissa Smolensky

CoreOS on VMware vSphere and VMware vCloud Air

March 9, 2015 · By Kelsey Hightower

Managing CoreOS Logs with Logentries

March 5, 2015 · By Melissa Smolensky

Upcoming CoreOS Events in March

March 3, 2015 · By Kelly Tenn

App Container and Docker

February 13, 2015 · By Jonathan Boulle

Announcing rkt and App Container v0.3.1

February 6, 2015 · By Jonathan Boulle

Upcoming CoreOS Events in February

February 3, 2015 · By Kelly Tenn

etcd 2.0 Release - First Major Stable Release

January 28, 2015 · By Brandon Philips

Update on CVE-2015-0235, GHOST

January 28, 2015 · By Alex Crawford

rkt and App Container 0.2.0 Release

January 23, 2015 · By Jonathan Boulle

Meet us for our January 2015 events

January 20, 2015 · By Kelly Tenn

Quay.io New Features

January 7, 2015 · By Jacob Moshenko

Announcing the etcd 2.0 Release Candidate

December 18, 2014 · By Xiang Li

App Container Spec One Week In

December 9, 2014 · By Brandon Philips

Docker 1.3.2 in Stable Channel

December 3, 2014 · By Alex Crawford

CoreOS is building a container runtime, rkt

December 1, 2014 · By Alex Polvi

Docker 1.3.2 Rolled Out Today

November 24, 2014 · By Alex Crawford

CoreOS Brings Kubernetes to Any Cloud Platform

November 10, 2014 · By Kelsey Hightower

Weekend Enjoyment: CoreOS Deployment Videos

November 7, 2014 · By Rob Szumski

Announcing CoreOS Enterprise Registry, a secure Docker registry behind your firewall

October 30, 2014 · By Joey Schorr

A Meetup Ride to San Mateo

October 29, 2014 · By Melissa Smolensky

CoreOS Now Available On Microsoft Azure

October 20, 2014 · By Alex Crawford

Godep for End User Go Projects

October 15, 2014 · By Brandon Philips

Managing CoreOS with Ansible

October 13, 2014 · By Roman Shtylman

CoreOS Machines Secured from Shellshock

September 26, 2014 · By Alex Polvi

Security Update on CVE-2014-6371 Shellshock

September 25, 2014 · By Brandon Philips

Congrats to Interactive Markdown at the TechCrunch Disrupt Hackathon

September 8, 2014 · By Melissa Smolensky

CoreOS Image Now Available On DigitalOcean

September 5, 2014 · By Alex Crawford

Introducing flannel: An etcd backed overlay network for containers

August 28, 2014 · By Eugene Yakubovich

CoreOS Just Got Easier to Try With Panamax

August 21, 2014 · By Lucas Carlson

CoreOS Certification and Training

August 20, 2014 · By Melissa Smolensky

Quay.io joins CoreOS, Introducing the CoreOS Enterprise Registry

August 13, 2014 · By Alex Polvi

Running Kubernetes Example on CoreOS, Part 2

July 30, 2014 · By Kelsey Hightower

CoreOS Stable Release

July 25, 2014 · By Alex Polvi

Running Kubernetes Example on CoreOS, Part 1

July 10, 2014 · By Kelsey Hightower

The CoreOS Epoch

June 30, 2014 · By Brandon Philips

CoreOS Officially on Rackspace OnMetal Cloud Servers

June 19, 2014 · By Alex Crawford

The CoreOS Update Philosophy

June 18, 2014 · By Kelsey Hightower

CoreOS Videos From Our Inaugural Meetup

June 17, 2014 · By Melissa Smolensky

Docker 1.0 released to Alpha

June 16, 2014 · By Melissa Smolensky

Official CoreOS Meetup in San Francisco June 3rd, 2014

May 28, 2014 · By Brian 'redbeard' Harrington

Official CoreOS Images on Google Compute Engine

May 23, 2014 · By Brandon Philips

etcd 0.4.0 with Standby Mode

May 20, 2014 · By Yicheng Qin

Zero Downtime Frontend Deploys with Vulcand on CoreOS

May 19, 2014 · By Rob Szumski

CoreOS Beta Release

May 9, 2014 · By Alex Polvi

Clustering CoreOS with Vagrant

April 24, 2014 · By Brandon Philips

etcd - The Road to 1.0

April 14, 2014 · By Blake Mizerany

Major Update: btrfs, docker 0.9, add users, writable /etc, and more!

March 27, 2014 · By Alex Polvi

Dynamic Docker links with an ambassador powered by etcd

February 27, 2014 · By Alex Polvi

Introduction to networkd, network management from systemd

February 25, 2014 · By Tom Gundersen

Cluster-Level Container Deployment with fleet

February 18, 2014 · By Brian Waldon

etcd 0.3.0 - Improved Cluster Discovery, API Enhancements and Windows Support

February 7, 2014 · By Brandon Philips

Brandon's etcd presentation at GoSF

January 16, 2014 · By Brandon Philips

Jumpers and the Software Defined Localhost

January 13, 2014 · By Alex Polvi

etcd 0.2.0 - new API, new modules and tons of improvements

December 27, 2013 · By Brandon Philips

Running etcd in Docker Containers

December 13, 2013 · By Rob Szumski

CoreOS alpha updates

December 9, 2013 · By Alex Polvi

Running a Utility Cluster on CoreOS

December 4, 2013 · By Rob Szumski

CoreOS on Google Compute Engine

December 2, 2013 · By Alex Polvi

etcd v0.1.2 with a new dashboard and bugfixes

October 10, 2013 · By Brandon Philips

Boot on Bare Metal with PXE

September 11, 2013 · By Brandon Philips

OpenStack, VMware and KVM images available

August 28, 2013 · By Brandon Philips

etcd v0.1.0 release

August 11, 2013 · By Brandon Philips

CoreOS Vagrant Images

August 2, 2013 · By Alex Polvi

Distributed configuration data with etcd

July 23, 2013 · By Brandon Philips

Recoverable System Upgrades

July 16, 2013 · By Brandon Philips