It happened the other day that one user reported that he was unable to pull a docker image from an internal registry. So I tried from my laptop, it looked fine at the first beginning. There were a few downloading processed going on, but it threw the error unknown blob at the end. So I tried … Continue reading Error response from daemon: error unmarshalling content: unexpected end of JSON input
Tag: docker
VT-x is not available caused by Docker for Windows
If you are trying to run Virtualbox on Windows, and received the error 'VT-x is not available (VERR_VMX_NO_VMX)'. Normally, the first thing is to check if the processor supports VT-x. If yes, then to see whether it has been enabled in BIOS? If yes, but you are still seeing this error. Then another possible reason … Continue reading VT-x is not available caused by Docker for Windows
Pods are not recreated after kubernetes node failure
We had a short outage recently which was caused by the pods were not recreated on other nodes when the previous node become unresponsive. It is Kubernetes 1.6, and according to the documentation, it is expected in some cases. "If the Status of the Ready condition is “Unknown” or “False” for longer than the … Continue reading Pods are not recreated after kubernetes node failure
Horizontal Pod Autoscaling
I did a quick test of the HPA (Horizontal Pod Autoscaling) on OpenShift, here are some key findings: Heapster metric is not near realtime, it is about 2 minutes delay in my test. HPA only has one threshold to decide when to scale up or scale down. I think it makes sense, as pods normally … Continue reading Horizontal Pod Autoscaling
Kubernetes as a Service
I still remember that more than two years ago, I spent a couple of days to setup a Kubernetes cluster in vSphere (refer this article ' Install Kubernetes' that I wrote in 2015). During that time not many people understood what container is not mention Kubertnetes, but nowadays everyone in the industry talks about container and … Continue reading Kubernetes as a Service
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