An Internet of Threads or will there also be Something in Open Source?

Currently I play with IoT devices and connected “things”, and as much they fascinate me, mostly they are quite locked and when the vendor loses interest, money or disappears from the market, these things mutate to ubiquitous threads and begin to scare me. Sure, most of the stuff is built on Linux, but passwords or … Read moreAn Internet of Threads or will there also be Something in Open Source?

OPENSHIFT NETWORKING FROM A CONTAINER/WORKLOAD POINT OF VIEW – PART 4: CONTAINER NETWORKING USING OPENSHIFT/KUBERNETES SERVICES

To allow stable endpoints in an environment of ever changing starting and stopping Pods (and therefore constantly changing IP addresses), Kubernetes introduces (and OpenShift uses) the concept of services. Services are stable IP addresses (taken per default from the 172.30.0.0/16 subnet) that remain the same as long as the service exists. Connection requests to a … Read moreOPENSHIFT NETWORKING FROM A CONTAINER/WORKLOAD POINT OF VIEW – PART 4: CONTAINER NETWORKING USING OPENSHIFT/KUBERNETES SERVICES

OPENSHIFT NETWORKING FROM A CONTAINER/WORKLOAD POINT OF VIEW – PART 3: CONTAINER NETWORKING ACROSS OPENSHIFT NODES

So far, this sounds like a lot of effort to achieve a little more than a plain docker host – containers that can talk to each other and to the host network, potentially segregated based on kubernetes namespace. However OpenShift SDN also allows pods on different nodes to communicate with each other. To this end, … Read moreOPENSHIFT NETWORKING FROM A CONTAINER/WORKLOAD POINT OF VIEW – PART 3: CONTAINER NETWORKING ACROSS OPENSHIFT NODES

How to trace IPTables in RHEL7 / CENTOS7

If you are debugging IPTables, it is handy to be able to trace the packets while it traverses the various chains. I was trying to find out why port forwarding from the external NIC to a virtual machine attached to a virtual bridge device was not working. You need to perform the following preparations: Load … Read moreHow to trace IPTables in RHEL7 / CENTOS7