k8s-wait-for-multi

This is an implementation of k8s-wait-for that allows you to wait for multiple items in one process, so you only need to start one init container. This uses informers (wrapped in a sigs.k8s.io/controller-runtime/pkg/cache.Cache) to get the status updates for all the items that this application is waiting for.

It accepts arguments in the following formats:

• namespace,service,service-name
• namespace,job,job-name
• namespace,pod,pod-name
• service,service-name using the namespace from the --namespace, -n flag or default
• job,job-name using the namespace from the --namespace, -n flag or default
• pod,pod-name using the namespace from the --namespace, -n flag or default
• pod-name using the namespace from the --namespace, -n flag or default and the kind pod

For pods it waits until the pod is Ready (k8s.io/kubectl/pkg/util/podutils.IsPodReady).

For jobs it wait until the Completed condition is true.

For services it will wait until all pods that match the service selector are Ready (like above).

Example

$ kube-wait-for-multi default,job,some-job default,service,some-service default,pod,some-pod-88bb5f7bb-wx4f7 

Wait for the job some-job to complete, the service some-service to have all available pods and the pod some-pod-88bb5f7bb-wx4f7 to be ready and available.

The program will also wait when a service does not exist yet.

$ kube-wait-for-multi default,job,some-job default,job,test default,service,service1 default,service,service2
Starting with namespaces: [default]
Starting informers...
wait status
└── [❔]  namespace/default
    ├── [✅]  service/service1: Available
    ├── [❔]  service/service2: Unavailable
    ├── [✅]  job/some-job: Complete
    └── [❌]  job/test: NotComplete
[... some time later ...]
wait status
└── [✅]  namespace/default

Docker

Hosted on Docker Hub: https://hub.docker.com/r/erayan/k8s-wait-for-multi

There are latest, nonroot, <tag> and <tag>-nonroot labels available, in amd64 (v2), arm (v7) and arm64.