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Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-3-1
Suggested Answer: E
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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. Reference:
* CIDR Blocks and Container Engine for Kubernetes - Oracle
* How kubernetes assigns podCIDR for nodes? - Stack Overflow
34 comments · newest first
CO
Corrie
10 months ago
Wait, why not just go 4-2-1? That feels safer.
BE
Becky
11 months ago
Seems like a solid plan to me!
SH
Shawnna
11 months ago
I thought it should be 2-2-3 instead.
AN
Antonio
11 months ago
I disagree, 3-3-1 seems unbalanced.
NE
Nettie
11 months ago
That distribution makes sense for redundancy.
AV
Avery
12 months ago
I’m not completely sure, but I think having one datacenter with only one manager could lead to issues if it goes down.
FA
Fanny
12 months ago
I feel like 3-3-1 might leave one datacenter vulnerable. Isn't it better to have at least two in each?
EM
Emilio
12 months ago
I remember a practice question where we had to distribute resources evenly, but I can't recall the exact numbers.
OC
Octavio
1 year ago
I think the distribution should be more balanced, like 3-2-2 instead of 3-3-1. Not sure though.
RE
Rene
1 year ago
Got it, the key is to evenly distribute the managers across the three datacenters or availability zones. 3-3-1 makes sense to me.
DA
Danica
1 year ago
I'm a bit unsure about this one. Is there a specific reason the solution is 3-3-1? I want to make sure I understand the logic before answering.
VI
Vicki
1 year ago
The solution says 3-3-1, so I'm guessing that means 3 managers in one datacenter, 3 in another, and 1 in the third. Seems logical.
YV
Yvonne
1 year ago
Okay, let me see if I can break this down. Seven managers in a swarm cluster, and we need to distribute them across three datacenters or availability zones.
DE
Denae
1 year ago
Hmm, this seems straightforward. I'll think through it step-by-step to make sure I get the right answer.
PE
Peggy
1 year ago
A 3-3-1 distribution? That's a lot of managers to keep track of. I hope they have a good head count system.
ME
Merilyn
1 year ago
No, it might be challenging to keep track of all the managers in different locations.
KE
Keshia
1 year ago
It does seem like a lot to manage, but having them distributed like that can help with redundancy.
LY
Lyda
1 year ago
User 3: No
CH
Cheryl
1 year ago
User 2: I agree, it does seem like a lot to manage
DO
Dottie
1 year ago
Yes
AD
Adelle
1 year ago
User 1: Yes
ER
Erasmo
1 year ago
The 3-3-1 solution seems logical, but I wonder if they're playing a game of 'musical chairs' with the managers.
AN
Antonio
1 year ago
3-3-1, huh? I guess they're trying to create the 'Three Musketeers' of data centers.
LE
Lenna
1 year ago
No
GL
Gladys
1 year ago
That's an interesting way to distribute them!
OL
Olive
1 year ago
Yes
CA
Candida
2 years ago
3-3-1 distribution across datacenters? Sounds like a magic trick - now you see them, now you don't!
MA
Madelyn
1 year ago
No
ER
Erick
1 year ago
Yes
SH
Sherell
1 year ago
No
MO
Mona
1 year ago
Yes
CR
Cristen
2 years ago
I disagree. I think having all managers in one datacenter would be more efficient for communication and management.
RO
Rodolfo
2 years ago
I agree with Lavina. Having 3-3-1 distribution makes sense for better fault tolerance.
LA
Lavina
2 years ago
I think the managers should be distributed evenly across the datacenters.