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You want to create a container that is reachable from its host's network.
Does this action accomplish this?
Solution. Use either EXPOSE or -publish to access the container on the bridge network.
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: seccomp
= Seccomp is a Linux kernel feature that allows you to restrict the actions available within the container. By using a seccomp profile, you can limit the system calls that a container can make, thus enhancing its security and isolation. Docker has a default seccomp profile that blocks some potentially dangerous system calls, such as mount, reboot, or ptrace. You can also pass a custom seccomp profile for a container using the--security-optoption. Seccomp can limit a container's access to host resources, such as CPU or memory, by blocking or filtering system calls that affect those resources, such as setpriority, sched_setaffinity, or mlock.Reference:
Seccomp security profiles for Docker
Hardening Docker Container Using Seccomp Security Profile
You configure a local Docker engine to enforce content trust by setting the environment variable
DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker image import
[docker image import]
[Content trust and image tags]
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'
The commanddocker service create -name dns-cache -p 53:53 -service udp dns-cacheisnot validbecause it has somesyntax errors. The correct syntax for creating a swarm service isdocker service create [OPTIONS] IMAGE [COMMAND] [ARG...]. The errors in the command are:
There should be a space between theoption flagand theoption value. For example,-name dns-cacheshould be-name dns-cache.
The option flag for specifying theservice modeis-mode, not-service. For example,-service udpshould be-mode udp.
The option flag for specifying theport mappingis--publishor-p, not-p. For example,-p 53:53should be--publish 53:53.
The correct command for creating a swarm service that only listens on port 53 using the UDP protocol is:
docker service create --name dns-cache --publish 53:53/udp dns-cache
This command will create a service calleddns-cachethat uses thedns-cacheimage and exposes port 53 on both the host and the container using the UDP protocol.
