yes, you can constrain a container to run in a given city (EWR etc) or region (ENAM etc)

JJohn Spurlock yes, you can constrain a container to run in a given city (EWR etc) or region (E...

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How would I set that? I tried looking in the docs and couldnt find anything about it other than it saying the containers automatically choose a location.

<<@235148962103951360>How would I set that? I tried looking in the docs and couldnt find anything abou...

J

John SpurlockOP•10/31/25, 5:07 PM

it's there in the API. I'm not sure how to do it in wrangler, maybe look here for clues? https://github.com/cloudflare/workers-sdk/blob/9c5601a7f5dc11869bf29fe5b4cb5c4558a75951/packages/workers-utils/src/config/environment.ts#L192

GitHub

workers-sdk/packages/workers-utils/src/config/environment.ts at 9c5...

Home to Wrangler, the CLI for Cloudflare Workers® - cloudflare/workers-sdk

J

John SpurlockOP•10/31/25, 5:08 PM

it definately does work though, I just reconfirmed both region and city constraints this morning on new container apps

JJohn Spurlock it's there in the API. I'm not sure how to do it in wrangler, maybe look here fo...

1

1984 Ford Laser•10/31/25, 7:57 PM

This definitely needs to be documented somewhere

JJohn Spurlock it definately does work though, I just reconfirmed both region and city constrai...

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<@235148962103951360>•11/1/25, 4:20 AM

Thanks ill try that.

11984 Ford Laser This definitely needs to be documented somewhere

G

gruntlord6•11/1/25, 5:12 AM

agreed, I get its a beta but this kind of stuff needs to be documented well

JJohn Spurlock it's there in the API. I'm not sure how to do it in wrangler, maybe look here fo...

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<@235148962103951360>•11/1/25, 7:59 AM

  "containers": [
                {
                    "class_name": "TestContainer",
                    "image": "./src/durableObjects/containers/TestContainer/Dockerfile",
                    "max_instances": 10,
                    "instance_type": "standard-1",
                    "rollout_active_grace_period": 0,
                    "rollout_step_percentage": [
                        100
                    ],
                    "constraints": {
                        "regions": ["OC"]
                    }
                }
            ],

  "containers": [
                {
                    "class_name": "TestContainer",
                    "image": "./src/durableObjects/containers/TestContainer/Dockerfile",
                    "max_instances": 10,
                    "instance_type": "standard-1",
                    "rollout_active_grace_period": 0,
                    "rollout_step_percentage": [
                        100
                    ],
                    "constraints": {
                        "regions": ["OC"]
                    }
                }
            ],

  "containers": [
                {
                    "class_name": "TestContainer",
                    "image": "./src/durableObjects/containers/TestContainer/Dockerfile",
                    "max_instances": 10,
                    "instance_type": "standard-1",
                    "rollout_active_grace_period": 0,
                    "rollout_step_percentage": [
                        100
                    ],
                    "constraints": {
                        "regions": ["OC"]
                    }
                }
            ],

  "containers": [
                {
                    "class_name": "TestContainer",
                    "image": "./src/durableObjects/containers/TestContainer/Dockerfile",
                    "max_instances": 10,
                    "instance_type": "standard-1",
                    "rollout_active_grace_period": 0,
                    "rollout_step_percentage": [
                        100
                    ],
                    "constraints": {
                        "regions": ["OC"]
                    }
                }
            ],

this is my config. i ran a deploy but the container still says the last location it was in, which isn't in the region i specified. I also get a warning in the wrangler config saying: Property constraints is not allowed

Wrangler also doesnt show the edit in the list of applied changes it shows when deploying

edit: seems i had to delete the container completely to get it to start in the right location

Eeve0415 How long shoud I wait?

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<@235148962103951360>•11/1/25, 8:04 AM

mine was done after i went to bed and woke up

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<@235148962103951360>•11/1/25, 8:04 AM

many hours

M

Minori•11/1/25, 9:43 AM

so I was thinking of being able to use Containers as a backend for our game servers, so let's say our matchmaking code that runs on workers or DO, we wanna spawn a gameserver that remains as long as the session is active or there's players in it, is that possible?

MMinori so I was thinking of being able to use Containers as a backend for our game serv...

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<@235148962103951360>•11/1/25, 10:04 AM

it is possible to an extent

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<@235148962103951360>•11/1/25, 10:04 AM

as far as i know, the containers dont expose ports and arent really accessible publicly

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<@235148962103951360>•11/1/25, 10:04 AM

however, there are ways around it such as using playit.gg or an ssh tunnel to a machine/instance that is able to expose the ports etc

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<@235148962103951360>•11/1/25, 10:05 AM

i have run a minecraft server with containers and it works

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<@235148962103951360>•11/1/25, 10:05 AM

disk is ephemeral, so youll have to backup/restore game server data/files

<

<@235148962103951360>•11/1/25, 10:06 AM

https://github.com/eastlondoner/mineflare

GitHub

GitHub - eastlondoner/mineflare

Contribute to eastlondoner/mineflare development by creating an account on GitHub.

M

Minori•11/1/25, 10:06 AM

We really don't mind the ephemeral nature of Containers as these instances are meant to elastically spin up and down so their player progress is stored elsewhere

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<@235148962103951360>•11/1/25, 10:07 AM

the only thing is just exposing your game server

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<@235148962103951360>•11/1/25, 10:07 AM

playit.gg or an ssh tunnel are 2 of the options

M

Minori•11/1/25, 10:07 AM

Gotcha thanks

<<@235148962103951360>https://github.com/eastlondoner/mineflare

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<@235148962103951360>•11/1/25, 10:08 AM

have a look at this it should give u an idea of how you could do it

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<@235148962103951360>•11/1/25, 10:08 AM

the only issue is the instance specs

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<@235148962103951360>•11/1/25, 10:09 AM

you need an enterprise plan to customise them i believe, or ur stuck with the default presets which arent exactly ideal for game servers e.g. 1/2 vcpu and 4gb ram for minecraft for example isnt great. the ram is ok for a small survival sever but 1/2 cpus is too weak

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<@235148962103951360>•11/1/25, 10:09 AM

i tried with 1/2 cpu/4gb and loading chunks took a while

M

Minori•11/1/25, 10:09 AM

I really wish they have better instances icl

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<@235148962103951360>•11/1/25, 10:09 AM

and the server was constantly behind

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<@235148962103951360>•11/1/25, 10:10 AM

there are higher ones

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<@235148962103951360>•11/1/25, 10:10 AM

but the specs arent suited for minecaft at least. maybe its ok for some other games

M

Minori•11/1/25, 10:10 AM

We do have the option of integrating Steam's Networking Relay if we can't expose the gameserver ports directly

M

Minori•11/1/25, 10:10 AM

I have to check how much Unreal's dedicated servers eat and go from there

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<@235148962103951360>•11/1/25, 10:10 AM

do you plan to make your own game

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<@235148962103951360>•11/1/25, 10:10 AM

that could work yeah

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<@235148962103951360>•11/1/25, 10:10 AM

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<@235148962103951360>•11/1/25, 10:10 AM

these are the available instance types

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<@235148962103951360>•11/1/25, 10:11 AM

i believe enterprise can customise it

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<@235148962103951360>•11/1/25, 10:11 AM

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<@235148962103951360>•11/1/25, 10:11 AM

@Minori also keep in mind this

A

Anon•11/1/25, 3:59 PM

Do containers retain the process's memory or flush them constantly?

AAnon Do containers retain the process's memory or flush them constantly?

I

Isaac McFadyen•11/1/25, 4:01 PM

They retain it for the lifetime of the container.

I

Isaac McFadyen•11/1/25, 4:02 PM

When the container is shut down the memory goes with it though, the same as you'd have on e.g. Docker

IIsaac McFadyen They retain it for the lifetime of the container.

A

Anon•11/1/25, 4:05 PM

I have some caching logic in my app, an I configure it(the container) so it stays up for 24hrs before restarting? And does that impact my bill drastically?

A

Anon•11/1/25, 4:05 PM

I have hard limits so the ~~program's~~ cache's memory usage doesn't exceed 2GB

AAnon I have some caching logic in my app, an I configure it(the container) so it stay...

I

Isaac McFadyen•11/1/25, 4:08 PM

You will be billed for the entire 24h, so yes it would impact your bill fairly heavily.

IIsaac McFadyen You will be billed for the entire 24h, so yes it would impact your bill fairly h...

A

Anon•11/1/25, 4:10 PM

Thanks for taking the time to answer me <3

JJulian Is possible to subscribe to the beta? when i try to deploy the containers-templa...

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<@235148962103951360>•11/1/25, 6:10 PM

i beleive you need to be on the workers paid plan

D

Dubz•11/1/25, 6:15 PM

Curious how much something like vaultwarden would cost to run on here with a few users and devices phoning home (basically it never sleeping)

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<@235148962103951360>•11/2/25, 1:42 AM

i believe the only ways is via fetch requests and websockets to directly communicate with it

yes, you can constrain a container to run in a given city (EWR etc) or region (ENAM etc)

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