Await container start healthy (smoke test)

container-health-check.sh

#!/bin/sh
set -e pipefail

#
# Assuming container has HEALTHCHECK command specified.
# Example:
# HEALTHCHECK --interval=1s --timeout=1s --start-period=3s --retries=30 \
#    CMD curl --fail http://localhost:80/ || exit 1
#

CONTAINER_IMAGE=${CONTAINER_IMAGE:-eu.gcr.io/org/image1:latest}
CONTAINER_NAME=${CONTAINER_NAME:-frontend}

MAX_TRIES=${MAX_TRIES:-30}

SUCCESS=0

exit_hook(){
    if [ ${SUCCESS} = 1 ]; then
        echo "Container started successfully! (exit 0)"
    fi

    if [ ${SUCCESS} = 0 ]; then
        printf "\nContainer failed to start!"
        printf "\nContainer logs: "
        docker logs "${CONTAINER_NAME}"

        printf "\nContainer status: "
        docker inspect --format='{{json .State}}' "${CONTAINER_NAME}"|jq
    fi

    docker stop "${CONTAINER_NAME}" >/dev/null 2>&1 || true
    docker rm "${CONTAINER_NAME}" >/dev/null 2>&1 || true
}

docker stop "${CONTAINER_NAME}" >/dev/null 2>&1 || true
docker rm "${CONTAINER_NAME}" >/dev/null 2>&1 || true

docker run --name "${CONTAINER_NAME}" -d "${CONTAINER_IMAGE}" >/dev/null

printf "\nContainer starting: "
docker ps -l -s

trap exit_hook EXIT

printf "\nAwaiting container start...\n"
for _ in $(seq 1 1 "$MAX_TRIES")
do
    sleep 1
    STATUS=$(docker inspect --format='{{.State.Health.Status}}' "${CONTAINER_NAME}")

    if [ "${STATUS}" = "healthy" ]; then
        echo "Container healthy!"
        SUCCESS=1
        break;
    fi
done