When it comes to giving out IP addresses, Kubernetes has a supply and demand problem. On the supply side, organizations are running low on IP addresses, because of large on-premises networks and multi-cloud deployments that use RFC1918 addresses (address allocation for private internets). On the demand side, Kubernetes resources such as pods, nodes and services each require an IP address. This supply and demand challenge has led to concerns of IP address exhaustion while deploying Kubernetes. Additionally, managing these IP addresses involves a lot of overhead, especially in cases where the team managing cloud architecture is different from the team managing the on-prem network. In this case, the cloud team often has to negotiate with the on-prem team to secure unused IP blocks.
There’s no question that managing IP addresses in a Kubernetes environment can be challenging. While there’s no silver bullet for solving IP exhaustion, Google Kubernetes Engine (GKE) offers ways to solve or work around this problem.
For example, Google Cloud partner NetApp relies heavily on GKE and its IP address management capabilities for users of its Cloud Volumes Service file service.
“NetApp’s Cloud Volumes Service is a flexible, scalable, cloud-native file service for our customers,” said Rajesh Rajaraman, Senior Technical Director at NetApp. “GKE gives us the flexibility to take advantage of non-RFC IP addresses and we can provide scalable services seamlessly without asking our customers for additional IPs,” Google Cloud and GKE enable us to create a secure SaaS offering and scale alongside our customers.”
Since IP addressing in itself is a rather complex topic and the subject of many books and web articles, this blog assumes you are familiar with the basics of IP addressing. So without further ado, let’s take a look at how IP addressing works in GKE, some common IP addressing problems and GKE features to help you solve them. The approach you take will depend on your organization, your use cases, applications, skill sets, and whether or not there’s an IP Address Management (IPAM) solution in place.
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