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How to parallelize execution on a single host? (self.ansible)

submitted 3 weeks ago by wasabi to c/ansible@lemmy.world

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I'm setting up an application using containers with ansible. I want to be able to set up the same application multiple times with a different set of variables. Is there a way how I could do this in parallel on a single host? I know I could deploy the same application n times on n different hosts, but what about n times on a single host? Is something like this possible? Doing it sequential obviously works, but it doesn't scale well.

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[–] wasabi 2 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

Could one maybe use multiple hosts in the ansible inventory that point to the same host?

Maybe k8s ist better suited for this.

[–] DasFaultier@sh.itjust.works 1 points 3 weeks ago* (last edited 3 weeks ago)

Yes, you could setup multiple DNS aliases in your nameserver/router or in your /etc/hosts file that point to the same IP; DNS might round-robin through the IPs, but I've never tried this.

EDIT: You're right, the DNS aliases go in the Ansible inventory, no need for DNS round-robin. Short brainfart, sry. EDIT END.

I have near-zero experience with k8s (apart from a little bit of Minikube, which I hated), so I can't say anything about that option, but my impression is that it's massive overkill for almost all use cases, aka "you're not Google".