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Docker DCA Exam - Topic 5 Question 112 Discussion

Posted by Jina on Jun 15, 2025 at 10:46 AM

Is this a type of Linux kernel namespace that provides container isolation?

Solution.Process ID

Suggested Answer: A

Process ID is a type of Linux kernel namespace that provides container isolation.Linux namespaces are a feature of the Linux kernel that isolate and virtualize system resources of a collection of processes1.Process ID namespace isolates the process ID number space, meaning that processes in different PID namespaces can have the same PID2.This allows each container to have its own init process with PID 1, which is the ancestor of all other processes in the container3.Process ID namespace also affects other identifiers, such as thread IDs, parent process IDs, and session IDs4.Reference: Namespaces in operation), pid_namespaces),What is a PID namespace?, Linux Namespaces: PID)


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36 comments · newest first
OM
Omer 10 months ago
No way, I thought it was something else.
DO
Dong 10 months ago
Wait, are we sure about that?
JO
Jovita 10 months ago
Definitely, that's how containers work.
DO
Domingo 10 months ago
Yes, it is a type of namespace!
NA
Narcisa 10 months ago
Pretty sure it's related to process isolation too.
TH
Thaddeus 11 months ago
I'm leaning towards "Yes" because I remember that namespaces are key for containerization, but I need to double-check my notes.
EL
Elsa 11 months ago
I practiced a similar question about network namespaces, and I think process ID is also related, but I can't recall the specifics.
KA
Kara 11 months ago
I remember studying namespaces, and I feel like process ID is definitely one of them, but I could be mixing it up with another type.
GW
Gwenn 11 months ago
I think process ID namespaces do provide some level of isolation, but I'm not entirely sure if that's what the question is asking.
DE
Dell 12 months ago
Yep, got it. Process ID namespaces are a key part of container isolation in Linux. Confident I can nail this one.
AL
Alton 12 months ago
Okay, let me break this down. Process ID namespaces provide isolation for processes within a container, so I'll go with A.
EL
Elvis 12 months ago
Wait, I'm a bit confused. Is this asking about a specific type of Linux namespace or just namespaces in general?
NA
Narcisa 1 year ago
I'm pretty sure I know the answer to this. Process ID namespaces are used for container isolation in Linux.
GE
Geraldo 1 year ago
Hmm, this looks like a tricky one. I'll need to think it through carefully.
GL
Glenna 1 year ago
Process ID? That's like saying my dog is a type of Linux kernel namespace. This question is barking up the wrong tree.
YE
Yen 1 year ago
↳ replying to Glenna
Process ID? That's like saying my dog is a type of Linux kernel namespace. This question is barking up the wrong tree.
MA
Matthew 1 year ago
↳ replying to Glenna
A) Yes
CA
Cammy 1 year ago
↳ replying to Glenna
Process ID? That's like saying my dog is a type of Linux kernel namespace. This question is barking up the wrong tree.
KA
Kate 1 year ago
↳ replying to Glenna
A) Yes
AL
Almeta 1 year ago
Process ID? More like Process Confusion if you ask me. I'm going to need a cup of coffee before I can even attempt to answer this one.
TI
Timothy 1 year ago
↳ replying to Almeta
No
SH
Shaun 1 year ago
↳ replying to Almeta
Yes
KA
Kate 1 year ago
I agree with Azzie, because the Process ID namespace in Linux kernel helps in isolating processes within containers.
KA
Karl 1 year ago
Ah, the old Process ID trick. Nice try, but I'm not falling for that one. Definitely going with 'No' on this one.
SH
Sharee 1 year ago
↳ replying to Karl
User 3: No
SA
Sanjuana 1 year ago
↳ replying to Karl
User 2: Yes
BE
Beckie 1 year ago
↳ replying to Karl
User 1: No
AZ
Azzie 1 year ago
Yes, it is.
AL
Alyce 1 year ago
Process ID? That's not a namespace, that's just a number! This question is making me question my entire Linux knowledge.
KE
Kent 1 year ago
↳ replying to Alyce
Yes
AR
Arlette 1 year ago
↳ replying to Alyce
Process ID is not a namespace, it's just a number.
CE
Celia 1 year ago
↳ replying to Alyce
B
TO
Tonja 1 year ago
↳ replying to Alyce
B) No
NA
Nakita 1 year ago
↳ replying to Alyce
A) Yes
JA
Jamika 1 year ago
↳ replying to Alyce
A
LO
Lorean 1 year ago
Is this a type of Linux kernel namespace that provides container isolation?
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