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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Orchestration | 25% | - Deploy and manage Swarm clusters - Create and manage services, stacks, secrets, and configurations - Perform rolling updates and rollbacks |
| Topic 2: Storage | 10% | - Backup, restore, and migrate data - Use volumes, bind mounts, and tmpfs - Configure persistent storage and data management |
| Topic 3: Security | 15% | - Apply security profiles and capabilities - Secure daemon and API communication - Scan images for vulnerabilities - Manage user access and roles |
| Topic 4: Installation and Configuration | 15% | - Configure daemon options, logging, and storage drivers - Set up Docker Enterprise components - Install Docker Engine on Linux, Windows, and macOS |
| Topic 5: Networking | 15% | - Secure and troubleshoot container networking - Understand bridge, overlay, and macvlan networks - Expose ports, publish services, and manage DNS |
| Topic 6: Images and Registry | 20% | - Sign and verify images with Docker Content Trust - Write efficient Dockerfiles, multi-stage builds - Manage image layers, tagging, and versioning - Work with Docker Hub and private registries |
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NEW QUESTION # 149
Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker swarm nodes'
Answer: A
Explanation:
Explanation
Using 'docker swarm nodes' does not list all nodes in a swarm cluster from the command line. The docker swarm command is used to initialize or join a swarm, or manage swarm options. It does not have a nodes subcommand. To list all nodes in a swarm cluster from the command line, you need to use 'docker node ls'.
References: https://docs.docker.com/engine/reference/commandline/swarm/,
https://docs.docker.com/engine/reference/commandline/node_ls/
NEW QUESTION # 150
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods -I env=development'
Answer: A
Explanation:
The command 'kubectl get pods -I env=development' will not display all the pods in the cluster that are labeled as 'env: development'. This is because the -I flag is not a valid option for kubectl get pods1. The correct flag to use is --selector or -l, which allows you to filter pods by labels2. Therefore, the correct command to display all the pods in the cluster that are labeled as 'env: development' is:
kubectl get pods --selector env=development
or
kubectl get pods -l env=development
:
kubectl Cheat Sheet | Kubernetes
Labels | Kube by Example
I hope this helps you understand the command and the label, and how they work with Kubernetes and pods. If you have any other questions related to Docker, please feel free to ask me.
NEW QUESTION # 151
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution: 'docker service create -name dns-cache -p 53:53 -service udp dns-cache'
Answer: A
NEW QUESTION # 152
You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution: 'docker service ps http'
Answer: A
Explanation:
Explanation
Using 'docker service ps http' enables you to view the list of historical tasks for this service. The docker service ps command shows information about tasks associated with one or more services. A task is a slot where a container runs to execute a service's commands. A task can have different states in its lifecycle, such as new, running, complete, failed, etc. The docker service ps command shows all tasks by default, including historical ones. References: https://docs.docker.com/engine/reference/commandline/service_ps/,
https://docs.docker.com/engine/swarm/how-swarm-mode-works/services/
NEW QUESTION # 153
Which networking drivers allow you to enable multi-host network connectivity between containers?
Answer: C
Explanation:
The networking drivers that allow you to enable multi-host network connectivity between containers are bridge, macvlan, ipvlan, and overlay. These drivers create networks that can span multiple Docker hosts, and therefore enable containers on different hosts to communicate with each other. The other drivers, such as host, user-defined, and none, create networks that are either isolated or limited to a single host. Here is a brief overview of each driver and how it supports multi-host networking:
* bridge: The bridge driver creates a network that connects containers on the same host using a Linux bridge. However, it can also be used to create a network that connects containers across multiple hosts using an external key-value store, such as Consul, Etcd, or ZooKeeper. This feature is deprecated and not recommended, as it requires manual configuration and has some limitations. The preferred driver for multi-host networking is overlay1.
* macvlan: The macvlan driver creates a network that assigns a MAC address to each container, making it appear as a physical device on the network. This allows the containers to communicate with other devices on the same network, regardless of the host they are running on. The macvlan driver can also use 802.1q trunking to create sub-interfaces and isolate traffic between different networks2.
* ipvlan: The ipvlan driver creates a network that assigns an IP address to each container, making it appear as a logical device on the network. This allows the containers to communicate with other devices on the same network, regardless of the host they are running on. The ipvlan driver can also use different modes, such as l2, l3, or l3s, to control the routing and isolation of traffic between different networks3.
* overlay: The overlay driver creates a network that connects multiple Docker daemons together using VXLAN tunnels. This allows the containers to communicate across different hosts, even if they are on different networks. The overlay driver also supports encryption, load balancing, and servicediscovery. The overlay driver is the default and recommended driver for multi-host networking, especially for Swarm services4.
Reference:
* Use bridge networks
* Use macvlan networks
* Use ipvlan networks
* Use overlay networks
NEW QUESTION # 154
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