Swarm vs Kubernetes decision in Docker - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize a Docker Swarm cluster on the manager node.

Docker

docker swarm [1]

Drag options to blanks, or click blank then click option'

Alaunch

Binit

Ccreate

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' instead of 'init' which does not initialize the swarm.

Using 'create' or 'launch' which are not valid swarm commands.

The command docker swarm init initializes a new Swarm cluster on the current node.

2fill in blank

medium

Complete the command to join a worker node to an existing Swarm cluster using the token.

Docker

docker swarm join --token [1] manager-node-ip:2377

Drag options to blanks, or click blank then click option'

Aworker-token

Binit-token

Cjoin-token

Dmanager-token

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'manager-token' which is for manager nodes only.

Using 'init-token' which is not a valid token name.

The worker-token is used by worker nodes to join the swarm cluster.

3fill in blank

hard

Fix the error in the Kubernetes deployment command to apply a configuration file.

Docker

kubectl [1] -f deployment.yaml

Drag options to blanks, or click blank then click option'

Acreate

Brun

Capply

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'create' which fails if resource exists.

Using 'run' or 'start' which are not valid for applying configs.

The kubectl apply command applies changes from a configuration file to the cluster.

4fill in blank

hard

Fill both blanks to list all running pods in the default namespace with detailed info.

Docker

kubectl [1] pods [2]

Drag options to blanks, or click blank then click option'

Aget

Bdescribe

C--all-namespaces

D-o wide

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'describe' which shows detailed info for one pod, not a list.

Using '--all-namespaces' which lists pods in all namespaces, not default.

The command kubectl get pods -o wide lists pods with extra details in the default namespace.

5fill in blank

hard

Fill all three blanks to create a Docker service with 3 replicas running nginx.

Docker

docker service [1] --replicas [2] [3]

Drag options to blanks, or click blank then click option'

Acreate

B3

Cnginx

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'run' instead of 'create' which is not valid for services.

Using wrong number of replicas or missing image name.

The command docker service create --replicas 3 nginx creates a service with 3 nginx containers.