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Kubernetes version: 1.15
Cloud being used: AWS
Host OS: Linux
CNI and version: vpc-cni 1.5.5
I have two use cases where teams only want Pod A to end up on a Node where Pod B is running. They often have many Copies of Pod B running on a Node, but they only want one copy of Pod A running on that same Node.
Currently they are using daemonsets to manage Pod A, which is not effective because then Pod A ends up on a lot of nodes where Pod B is not running. I would prefer not to restrict the nodes they can end up on with labels because that would limit the Node capacity for Pod B (ie- if we have 100 nodes and 20 are labeled, then Pod B’s possible capacity is only 20).
In short, how can I ensure that one copy of Pod A runs on any Node with at least one copy of Pod B running?