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NEW QUESTION # 130
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: seccomp
Answer: A
Explanation:
Explanation
Using seccomp does not limit a Docker container's access to host resources, such as CPU or memory.
Seccomp is a Linux kernel facility that allows filtering system calls made by a process. It can be used to enhance the security and isolation of a container by restricting its access to certain system calls. However, it does not affect the resource allocation or consumption of a container. References:
https://docs.docker.com/engine/security/seccomp/,
https://www.kernel.org/doc/html/v4.14/userspace-api/seccomp_filter.html
NEW QUESTION # 131
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: user
Answer: B
Explanation:
The user namespace is a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. The user namespace allows the host system to map its own uid and gid to some different uid and gid for containers' processes. This improves the security of Docker by isolating the user and group ID number spaces, so that a process's user and group ID can be different inside and outside of a user namespace1. To enable the user namespace, the daemon must start with --userns-remap flag with a parameter that specifies base uid/gid2. All containers are run with the same mapping range according to /etc/subuid and /etc/subgid3. Reference:
Isolate containers with a user namespace
Using User Namespaces on Docker
Docker 1.10 Security Features, Part 3: User Namespace
NEW QUESTION # 132
An application image runs in multiple environments, with each environment using different certificates and ports.
Is this a way to provision configuration to containers at runtime?
Solution: Create a Dockerfile for each environment, specifying ports and ENV variables for certificates.
Answer: A
Explanation:
While creating a Dockerfile for each environment is a possible solution, it is not the most efficient or scalable way to provision configuration to containers at runtime. Docker provides several mechanisms to inject configuration into containers at runtime, such as environment variables, command line arguments, Docker secrets for sensitive data, or even configuration files mounted as volumes. These methods allow the same Docker image to be used across multiple environments, promoting immutability and consistency across your deployments. Creating a separate Dockerfile for each environment would mean maintaining multiple versions of the Dockerfile, which could lead to inconsistencies and is generally not a recommended practice.
NEW QUESTION # 133
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run -v /data:/mydata --mode readonly ubuntu'
Answer: A
Explanation:
= The command docker run -v /data:/mydata --mode readonly ubuntu is not valid because it has some syntax errors. The correct syntax for running a container with a bind mount is docker run [OPTIONS] IMAGE [COMMAND] [ARG...]. The errors in the command are:
The option flag for specifying the volume is --volume or -v, not -v. For example, -v /data:/mydata should be --volume /data:/mydata.
The option flag for specifying the mode of the volume is --mount, not --mode. For example, --mode readonly should be --mount type=bind,source=/data,target=/mydata,readonly.
The option flag for specifying the mode of the container is --detach or -d, not --mode. For example, --mode readonly should be --detach.
The correct command for running a container with a bind mount in read-only mode is:
docker run --volume /data:/mydata --mount type=bind,source=/data,target=/mydata,readonly --detach ubuntu This command will run a container using the ubuntu image and mount the host's /data directory to the container's /mydata directory in read-only mode. The container will run in the background (--detach).
docker run reference | Docker Documentation : [Use bind mounts | Docker Documentation]
NEW QUESTION # 134
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages
Answer: B
Explanation:
Multi-stage builds are a feature of Docker that allows you to use multiple FROM statements in your Dockerfile. Each FROM statement creates a new stage of the build, which can use a different base image and run different commands. You can then copy artifacts from one stage to another, leaving behind everything you don't want in the final image. This optimizes the image size and reduces the attack surface by removing unnecessary dependencies and tools. For example, you can use a stage to compile your code, and then copy only the executable file to the final stage, which can use a minimal base image like scratch. This way, you don't need to include the compiler or the source code in the final image. Reference:
Multi-stage builds | Docker Docs
What Are Multi-Stage Docker Builds? - How-To Geek
Multi-stage | Docker Docs
NEW QUESTION # 135
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