Abstract
As seen in Chapters 1 through 4, the OpenShift platform integrates and builds on top of Kubernetes to provide an environment to run and scale containerized applications reliably. To maintain the most resiliency and benefit the most from the HA capabilities of the platform, the infrastructure hosting the cluster should use load balancers to steer the traffic to the Nodes in the cluster serving the application at a given time. This chapter explores various configuration options when using load balancers with OpenShift.
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Notes
- 1.
The supported load balancing strategies are described here: https://docs.openshift.com/container-platform/3.11/architecture/networking/routes.html#load-balancing
- 2.
A list of available Environment Variables to fine-tune the OpenShift Router is available at https://docs.openshift.com/container-platform/3.11/architecture/networking/routes.html#env-variables
- 3.
Standard Name Indication (SNI) is an extension of the TLS protocol. With this extension, the client indicates the hostname it is trying to contact at the start of the handshaking process.
- 4.
To use this option, the externalIPNetworkCDIRs must be configured and enabled: https://docs.openshift.com/container-platform/3.11/dev_guide/expose_service/expose_internal_ip_service.html
- 5.
To customize the ExternalIPs for this option, use the ingressIPNetworkCIDR variable in the Master Node configuration: https://docs.openshift.com/container-platform/3.11/admin_guide/tcp_ingress_external_ports.html#unique-external-ips-ingress-traffic-configure-cluster
- 6.
For configuration requirements for the OpenShift IP Failover capability, refer to https://docs.openshift.com/container-platform/3.11/admin_guide/high_availability.html#configuring-ip-failover
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© 2019 William Caban
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Caban, W. (2019). Load Balancers. In: Architecting and Operating OpenShift Clusters. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-4985-7_5
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DOI: https://doi.org/10.1007/978-1-4842-4985-7_5
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