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The Kubernetes yaml shown below describes a networkPolicy. Will the networkPolicy BLOCK this traffic? Solution: a request issued from a pod lacking the tier: api label, to a pod bearing the tier: backend label
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The Kubernetes yaml shown below describes a clusterIP service. Is this a correct statement about how this service routes requests? Solution: Traffic sent to the IP of this service on port 8080 will be routed to port 80 in a random pod with the label aPP: nginx.
A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space. If every pod on this node has exactly two containers in it, how many pods can this address space support on this node?
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A user's attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation? Solution. SELinux
Will this command display a list of volumes for a specific container? Solution: docker volume inspect nginx'

Question 30 - DCA discussion

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A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.

Can this be used to schedule containers to meet the security policy requirements?

Solution: label contraints

A.

Yes

Answers
A.

Yes

B.

No

Answers
B.

No

Suggested answer: A

Explanation:

Label constraints can be used to schedule containers to meet the security policy requirements.Label constraints allow you to specify which nodes a service can run on based on the labels assigned to the nodes1. For example, you can label the nodes that are intended for development withenv=devand the nodes that are intended for production withenv=prod. Then, you can use the--constraintflag when creating a service to restrict it to run only on nodes with a certain label value.For example,docker service create --name dev-app --constraint 'node.labels.env == dev' ...will create a service that runs only on development nodes2.Similarly,docker service create --name prod-app --constraint 'node.labels.env == prod' ...will create a service that runs only on production nodes3. This way, you can ensure that development and production containers are running on separate nodes in a given Swarm cluster.Reference:

Add labels to swarm nodes

Using placement constraints with Docker Swarm

Multiple label placement constraints in docker swarm

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asked 08/11/2024
Richard Drayer Camacho
37 questions
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