Ready

Ready is a container that waits for a list of pods within a load test to become available. It exits successfully when all worker pods are ready, writing a comma-separated list of their IP addresses to a file. It exits unsuccessfully if a timeout was exceeded before all pods were ready.

Usage

The container relies on command line argument to specify the load test's name. For example,, the following waits for all worker pods which belong to the LoadTest named <LOADTEST_NAME>:

go run ready.go <LOADTEST_NAME>

Meanwhile, users can set environment variables to override some defaults:

• $READY_TIMEOUT specifies the maximum amount of time the container should wait for pods to become ready. This time is specified in a human-readable format that is parsable by Go's time.ParseDuration. For example, "1m" represents 1 minute and "3h" represents 3 hours. If this timeout is reached before the pods are ready, the container will exit with a code of 1.

• $READY_OUTPUT_FILE specifies the absolute path of the output file. This will contain a comma-separated list of IP addresses for matching pods. This defaults to /tmp/loadtest_workers.

• $KUBE_CONFIG specifies the path to a Kubernetes config file. This can be omitted when running in a Kubernetes cluster. If running outside a cluster, this is required. It will likely be ~/.kube/config when developing locally on Linux.

Building

This image requires some utility code outside of this directory. Therefore, the test-infra/ directory should be used as the build context:

cd ../../../  # should be test-infra/
docker build -f containers/init/ready/Dockerfile .