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| Section | Objectives |
|---|---|
| Topic 1: Docker Installation & Configuration | - Docker Engine setup and configuration
|
| Topic 2: Image Creation, Management, and Registry | - Docker images lifecycle
|
| Topic 3: Troubleshooting | - Diagnostics and debugging
|
| Topic 4: Networking | - Docker networking concepts
|
| Topic 5: Orchestration | - Container orchestration basics
|
| Topic 6: Storage and Volumes | - Data persistence in Docker
|
| Topic 7: Security | - Docker security fundamentals
|
>> DCA Latest Test Question <<
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NEW QUESTION # 85
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?
Solution: Set IGNORE_TLS in the 'daemon.json' configuration file.
Answer: B
Explanation:
= This is not a way to configure the Docker engine to use a registry without a trusted TLS certificate. There is no such option as IGNORE_TLS in the daemon.json configuration file. The daemon.json file is used to configure various aspects of the Docker engine, such as logging, storage, networking, and security1. To use a registry without a trusted TLS certificate, you need to either add the certificate to the trusted root certificates of the system, or configure the Docker engine to allow insecure registries2. To add the certificate to the trusted root certificates, you need to copy the certificate file to the /etc/docker/certs.d/<registry-hostname>/ directory on every Docker host2. To configure the Docker engine to allow insecure registries, you need to add the registry hostname or IP address to the "insecure-registries" array in the daemon.json file3. For example:
{ "insecure-registries" : ["myregistry.example.com:5000"] }
Note that using insecure registries is not recommended, as it exposes you to potential man-in-the-middle attacks and data corruption3. You should always use a registry with a trusted TLS certificate, or use Docker Content Trust to sign and verify your images4. Reference:
Daemon configuration file | Docker Docs
Verify repository client with certificates | Docker Docs
Test an insecure registry | Docker Docs
Content trust in Docker | Docker Docs
NEW QUESTION # 86
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: Linux capabilities
Answer: B
Explanation:
= Linux capabilities are a way of restricting the privileges of a process or a container. By default, Docker containers run with a reduced set of capabilities, which means they cannot perform certain operations that require higher privileges, such as setting the system time1. To allow a container to set the system time, you need to grant it the SYS_TIME capability by using the --cap-add option when running the container2. For example, docker run --cap-add SYS_TIME alpine date -s 12:00 would set the system time to 12:00 inside the alpine container3. Reference: Docker Documentation, Runtime privilege and Linuxcapabilities, Change system date time in Docker containers without impacting host, Is it possible to change time dynamically in docker container?
NEW QUESTION # 87
Can this set of commands identify the published port(s) for a container?
Solution: docker container inspect', 'docker port'
Answer: B
NEW QUESTION # 88
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?
Answer: A
Explanation:
A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space. This means that the node can assign up to 64 IP addresses to its resources, such as pods and containers. If every pod on this node has exactly two containers in it, then each pod will need two IP addresses, one for each container. Therefore, the node can support up to 32 pods, since 64 / 2 = 32. The other options are incorrect because they either exceed the available IP addresses or do not account for the number of containers per pod. References:
*CIDR Blocks and Container Engine for Kubernetes - Oracle
*How kubernetes assigns podCIDR for nodes? - Stack Overflow
NEW QUESTION # 89
Which flag for a service would allow a container to consume more than 2 GB of memory only when there is no memory contention but would also prevent a container from consuming more than 4GB of memory, in any case?
Answer: C
NEW QUESTION # 90
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