The following Docker Compose file is deployed as a stack:

Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.

• A.Yes
• B.No

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Which of the following commands will create a swarm service which only listens on port 53 using the UDP protocol?

• A.docker service create --name dns-cache -p 53:53 ..constraint
  networking.protocol.udp=true dns-cache
• B.docker service create --name dns-cache -p 53:53 --udp dns-cache
• C.docker service create --name dns-cache -p 53:53 --service udp dns-cache
• D.docker service create --name dns-cache -p 53:53/udp dns-cache

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Which of the following is true about overlay networks?

• A.Overlay networks are only created on the manager nodes.
• B.Overlay networks are created only on the manager node that you created the overlay
  networking on
• C.Overlay networks are first created on the manager nodes. Then they are created on the
  worker nodes once a task is scheduled on the specific worker node.
• D.Overlay networks are created on all cluster nodes when you create the overlay network.

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Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: net

• A.No
• B.Yes

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When using the Docker client to push an image to a registry, what environment variable is used to instruct the client to perform signing of the image?

• A.DOCKER_CONTENT_TRUST=1
• B.DOCKER_IMAGE_SIGN=1
• C.DOCKER_PUSH_SIGN=1
• D.NOTARY_ENABLE=1
  Correct

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