Posts in 2021
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Writing a Controller for Pod Labels
By Arthur Busser (Padok) | Monday, June 21, 2021 in Blog
Operators are proving to be an excellent solution to running stateful distributed applications in Kubernetes. Open source tools like the Operator SDK provide ways to build reliable and maintainable operators, making it easier to extend Kubernetes and …
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Using Finalizers to Control Deletion
By Aaron Alpar (Kasten) | Friday, May 14, 2021 in Blog
Deleting objects in Kubernetes can be challenging. You may think you’ve deleted something, only to find it still persists. While issuing a kubectl delete command and hoping for the best might work for day-to-day operations, understanding how …
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Kubernetes 1.21: Metrics Stability hits GA
By Han Kang (Google), Elana Hashman (Red Hat) | Friday, April 23, 2021 in Blog
Kubernetes 1.21 marks the graduation of the metrics stability framework and along with it, the first officially supported stable metrics. Not only do stable metrics come with supportability guarantees, the metrics stability framework brings escape …
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Evolving Kubernetes networking with the Gateway API
By Mark Church (Google), Harry Bagdi (Kong), Daneyon Hanson (Red Hat), Nick Young (VMware), Manuel Zapf (Traefik Labs) | Thursday, April 22, 2021 in Blog
The Ingress resource is one of the many Kubernetes success stories. It created a diverse ecosystem of Ingress controllers which were used across hundreds of thousands of clusters in a standardized and consistent way. This standardization helped users …
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Graceful Node Shutdown Goes Beta
By David Porter (Google), Mrunal Patel (Red Hat), Tim Bannister (The Scale Factory) | Wednesday, April 21, 2021 in Blog
Graceful node shutdown, beta in 1.21, enables kubelet to gracefully evict pods during a node shutdown. Kubernetes is a distributed system and as such we need to be prepared for inevitable failures — nodes will fail, containers might crash or be …
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Defining Network Policy Conformance for Container Network Interface (CNI) providers
By Matt Fenwick (Synopsys), Jay Vyas (VMWare), Ricardo Katz, Amim Knabben (Loadsmart), Douglas Schilling Landgraf (Red Hat), Christopher Tomkins (Tigera) | Tuesday, April 20, 2021 in Blog
Special thanks to Tim Hockin and Bowie Du (Google), Dan Winship and Antonio Ojea (Red Hat), Casey Davenport and Shaun Crampton (Tigera), and Abhishek Raut and Antonin Bas (VMware) for being supportive of this work, and working with us to resolve …
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Annotating Kubernetes Services for Humans
By Richard Li (Ambassador Labs) | Tuesday, April 20, 2021 in Blog
Have you ever been asked to troubleshoot a failing Kubernetes service and struggled to find basic information about the service such as the source repository and owner? One of the problems as Kubernetes applications grow is the proliferation of …
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Introducing Indexed Jobs
By Aldo Culquicondor (Google) | Monday, April 19, 2021 in Blog
Once you have containerized a non-parallel Job, it is quite easy to get it up and running on Kubernetes without modifications to the binary. In most cases, when running parallel distributed Jobs, you had to set a separate system to partition the work …
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Volume Health Monitoring Alpha Update
By Xing Yang (VMware) | Friday, April 16, 2021 in Blog
The CSI Volume Health Monitoring feature, originally introduced in 1.19 has undergone a large update for the 1.21 release. Why add Volume Health Monitoring to Kubernetes? Without Volume Health Monitoring, Kubernetes has no knowledge of the state of …
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Three Tenancy Models For Kubernetes
By Ryan Bezdicek (Medtronic), Jim Bugwadia (Nirmata), Tasha Drew (VMware), Fei Guo (Alibaba), Adrian Ludwin (Google) | Thursday, April 15, 2021 in Blog
Kubernetes clusters are typically used by several teams in an organization. In other cases, Kubernetes may be used to deliver applications to end users requiring segmentation and isolation of resources across users from different organizations. …