Abstract
To properly architect an OpenShift cluster, we need to understand the different components of the platform, their roles, and how they interact with each other. This base knowledge is important to be able to fine-tune OpenShift cluster design to your organization’s need beyond what is covered in this book.
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Notes
- 1.
In some documentation, you may find a statement about the existence of six namespaces, and in other documentations, you will find seven namespaces listed. Those lists do not count the cgroup namespace which virtualizes the cgroup capabilities as a namespace. For details about the namespace vs. the capability, refer to the Linux man page cgroup_namespaces, the Linux man page for cgroups, and the Linux man page for namespaces.
- 2.
The CRI specification defines four actions: CreatePod, StartPod, StopPod, and RemovePod.
- 3.
For more details, visit https://github.com/prometheus/node_exporter
- 4.
For more details, visit https://github.com/kubernetes/node-problem-detector
- 5.
When using NodePorts, the requested or dynamically assigned port is allocated in all the nodes of the particular cluster. Additional details are available at https://kubernetes.io/docs/concepts/services-networking/service/#nodeport
- 6.
In general the use of HostPort is discouraged. Acceptable use cases are DaemonSets or some networking services. Upstream HostPort documentation is scarce, but functionality is similar to NodePorts but for a subset of Nodes.
- 7.
Kubernetes Ingress feature state: https://kubernetes.io/docs/concepts/services-networking/ingress/#prerequisites
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- 10.
For information about build strategies, visit https://docs.openshift.com/container-platform/3.11/architecture/core_concepts/builds_and_image_streams.html
- 11.
Source-to-Image (S2I) is an Open Source project ( https://github.com/openshift/source-to-image ) to create container images from source code. For information on how to use S2I in OpenShift, refer to https://docs.openshift.com/container-platform/3.11/creating_images/s2i.html
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© 2019 William Caban
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Caban, W. (2019). The OpenShift Architecture. In: Architecting and Operating OpenShift Clusters. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-4985-7_1
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DOI: https://doi.org/10.1007/978-1-4842-4985-7_1
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