run only one task in one node

[Parveen Kumar]

Hi All,

i need to run only 1 task in one client node.
i have 2 server and 4 client. i have defined two task in one group in nomad job where i defined count as 2 for both task.
my use case is when i run the job. there would be total 4 task and 4 allocation. but i want that each allocation should happen on one machine only.
if cl1 is assigned task 1 , it should not be allocated task 2 also.

can i do it? please confirm.

[Diptanu Choudhury]

Hi Parveen,

You can add a distinct_host constraint to restrict two allocations of a same job running on the same machine. Please refer to the constraint section in the documentation - https://www.nomadproject.io/docs/jobspec/index.html

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Thanks,
Diptanu Choudhury

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[Parveen Kumar]

Hi Diptanui,

Thanks for suggesting distinct_host. I have already tried distinct_host but it only restrict same job on one machine. Here, i want the single task from the same job to be allocated on one client machine.
Can we use any other constraint. also i didn't find constraint list supported by nomad. provide that so that i can do modify my job closer to match my scenario needs.

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Thanks,
Parveen Kumar
http://in.linkedin.com/in/parveenkumar1990

[Alex Dadgar]

Hey Parveen,

You are slightly mixing up the terms (task, task group, job). So it is a bit hard to determine your desired goal. But distinct_host specified at the job level will ensure that all the task groups in the job will be on unique machines which sounds like what you want.

Thanks,

Alex

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[Parveen Kumar]

Thanks Alex. I think i am looking for something else. Can you provide me list of constraints which we can use in nomad jobs?

[Alex Dadgar]

The constraints are available here: https://www.nomadproject.io/docs/jobspec/index.html#operator

You can do regex or equality checking on attributes and you can also do distinct_host.

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