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Docker DCA Exam - Topic 6 Question 113 Discussion

Posted by Gladys on Jul 07, 2025 at 03:22 AM

You want to create a container that is reachable from its host's network. Does this action accomplish this?

Solution: Use --link to access the container on the bridge network.

Suggested Answer: B

= The action of using--linkto access the container on the bridge network doesnotaccomplish the goal of creating a container that is reachable from its host's network.The--linkoption allows you to connect containers that are running on the same network, but it doesnotexpose the container's ports to the host1.To create a container that is reachable from its host's network, you need to use the--network hostoption, which attaches the container to the host's network stack and makes it share the host's IP address2.Alternatively, you can use the--publishor-poption to map the container's ports to the host's ports3.

: :Legacy container links | Docker Documentation:Networking using the host network | Docker Documentation:docker run reference | Docker Documentation


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28 comments · newest first
AR
Arminda 10 months ago
Really? I didn't know that!
MA
Ma 10 months ago
I thought --link was deprecated though?
CA
Carmela 10 months ago
No, you need to use --network instead.
AD
Adell 10 months ago
Definitely not the best practice anymore.
CL
Claudio 11 months ago
Yes, --link is a way to connect containers!
JA
Jacquelyne 11 months ago
I vaguely remember that to expose a container to the host, you usually need to use port mapping instead of --link.
MI
Michal 11 months ago
I'm a bit unsure, but I thought --link was mainly for communication between containers on the same network, not for host access.
VA
Valentin 11 months ago
I feel like I practiced a question similar to this, and I think the answer was no. The --link option is outdated for networking.
AM
Amie 12 months ago
I think using --link might not actually make the container reachable from the host's network. I remember it being more about connecting containers rather than exposing them.
MI
Mitsue 12 months ago
The key here is that we want the container to be reachable from the host's network, not just the bridge network. The solution mentions --link, which I believe is used for linking containers, not making them accessible from the host. I'll need to review my networking concepts to be sure.
RA
Raymon 12 months ago
Wait, I'm a little confused. Isn't the bridge network just for internal container-to-container communication? I'm not sure that would make the container reachable from the host's network. I'll have to think this through more carefully.
ST
Staci 1 year ago
Okay, I think I know the answer to this. Connecting a container to the bridge network should make it reachable from the host's network. Let me double-check the details, but I'm feeling confident about this.
RO
Rodolfo 1 year ago
Hmm, I'm not sure about this one. The solution mentions using --link, but I'm not familiar with that Docker command. I'll need to review my notes on networking containers.
MI
Milly 1 year ago
Yes, I agree with Pete. Using --link is the solution for accessing the container on the bridge network.
PA
Paris 1 year ago
No, I think there might be other ways to make the container reachable.
VI
Vicente 1 year ago
Wait, is this a trick question? I'm pretty sure the --link option is not the way to go these days. Gotta be B, right?
PA
Pansy 1 year ago
Seriously? --link? What is this, 2015? Everyone knows you use the bridge network these days. Time to get with the times, folks.
BE
Beckie 1 year ago
↳ replying to Pansy
No
TW
Twanna 1 year ago
↳ replying to Pansy
Yes
RA
Raylene 1 year ago
Ah, the old --link trick. Brings back memories of the good ol' days of Docker. But hey, at least it gets the job done!
PE
Pete 1 year ago
Yes, using --link allows access on the bridge network.
BE
Bea 1 year ago
No way, that can't be right. Didn't they switch to using the bridge network by default? Time to hit the docs again.
MI
Milly 1 year ago
↳ replying to Bea
Yes, you're right. We should double-check the documentation to be sure.
PA
Pauline 1 year ago
↳ replying to Bea
No, I don't think that's correct. They switched to using the bridge network by default.
LO
Lorriane 1 year ago
Hmm, I thought the --link option was deprecated. Guess I need to brush up on my container networking!
EL
Elke 1 year ago
↳ replying to Lorriane
Hmm, I thought the --link option was deprecated. Guess I need to brush up on my container networking!
TA
Tamesha 1 year ago
↳ replying to Lorriane
B) No
NI
Nikita 1 year ago
↳ replying to Lorriane
A) Yes
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