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| Section | Objectives |
|---|---|
| Security | - Docker security fundamentals
|
| Troubleshooting | - Diagnostics and debugging
|
| Storage and Volumes | - Data persistence in Docker
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| Orchestration | - Container orchestration basics
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| Image Creation, Management, and Registry | - Docker images lifecycle
|
| Networking | - Docker networking concepts
|
| Docker Installation & Configuration | - Docker Engine setup and configuration
|
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NEW QUESTION # 59
Which of the following constitutes a production-ready devicemapper configuration for the Docker engine?
Answer: D
Explanation:
Explanation
NEW QUESTION # 60
In the context of a swarm mode cluster, does this describe a node?
Solution.an instance of the Docker CLI connected to the swarm
Answer: B
Explanation:
Explanation
The statement does not describe a node in the context of a swarm mode cluster. A node is a physical or virtual machine running Docker Engine 1.12 or later in swarm mode1. An instance of the Docker CLI connected to the swarm is not a node, but a client that can interact with the swarm through the Docker API2. The Docker CLI can be used to create a swarm, join nodes to a swarm, deploy services to a swarm, and manage swarm behavior3. References: How nodes work), Docker CLI), Swarm mode overview)
NEW QUESTION # 61
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-2-2
Answer: B
Explanation:
Explanation
= Distributing seven managers across three datacenters or availability zones as 3-2-2 is not a good way to ensure high availability and fault tolerance. This is because a swarm cluster requires a majority of managers (more than half) to be available and able to communicate with each other in order to maintain the swarm state and avoid a split-brain scenario1. If one of the datacenters or availability zones with three managers goes down, the remaining four managers will not have a quorum and the swarm will stop functioning. A better way to distribute seven managers across three datacenters oravailability zones is 3-3-1 or 3-2-1-1, which will allow the swarm to survive the loss of one or two datacenters or availability zones, respectively2. References:
* Administer and maintain a swarm of Docker Engines | Docker Docs
* How to Create a Cluster of Docker Containers with Docker Swarm and DigitalOcean on Ubuntu 16.04 | DigitalOcean
NEW QUESTION # 62
Will this command display a list of volumes for a specific container?
Solution. 'docker container inspect nginx'
Answer: A
Explanation:
Explanation
Using docker container inspect nginx does display a list of volumes for a specific container. The docker container inspect command shows low-level information about one or more containers in JSON format. This information includes various details about the container's configuration, state, network settings, mounts, etc.
To display a list of volumes for a specific container, you can either look at the Mounts section in the JSON output or use --format '{{ .Mounts }}' to filter out only that section. References:
https://docs.docker.com/engine/reference/commandline/container_inspect/,
https://docs.docker.com/engine/reference/commandline/container_inspect/#format-the-output
NEW QUESTION # 63
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Uninstall 'docker-ce' package before installing 'docker-ee' package.
Answer: B
Explanation:
= Uninstalling the 'docker-ce' package before installing the 'docker-ee' package will not upgrade Docker Engine CE to Docker Engine EE. It will only remove the existing Docker Engine CE installation and install a new Docker Engine EE installation. This means that any existing containers, images, volumes, networks, and other Docker resources will be lost. To upgrade Docker Engine CE to Docker Engine EE without losing any data, you need to use the migration tool provided by Docker1 or follow the steps described in the Docker documentation2 or other online guides34. References:
* 1: Migrate to Engine 1.10 | Docker Docs
* 2: Install Docker Engine | Docker Docs
* 3: Switching Docker 18.09 Community Edition to Enterprise Engine with no ...
* 4: How to upgrade Docker 18.09 Community Edition to Docker Enterprise 18.09
NEW QUESTION # 64
......
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