how to set mtu for woodpecker-agent

[huaxk]

Component

agent

Describe the bug

I installed woodpecker on k8s via helm, but cannot download large files in the image started by the agent with dind, the problem should be in the mtu value, it may be set to less than the default value 1500, such as 1300, but I can't find a way to set the mtu for the agent. This problem can be solved by setting env: DRONE_RUNNER_NETWORK_OPTS: "com.docker.network.driver.mtu:1300" in drone.

System Info

woodpecker version: 0.15.6
k8s version: v1.24.7+rke2r1

Additional context

No response

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[6543]

what image/plugin do you use to download stuff?

[huaxk]

I install woodpecker by helm:

woodpecker/woodpecker-server    0.15.6          v0.15.6
woodpecker/woodpecker-agent     0.15.6          v0.15.6
docker:20.10.12-dind

[jaqua]

@huaxk Did you find a solution?

In drone you can set MTU:
gliderlabs/docker-alpine#307 (comment)

But using woodpecker, every docker build command gets stucked.

[6543]

@huaxk well we can do so too: https://woodpecker-ci.org/plugins/Docker%20Buildx -> Advanced Settings

so this was a plugin question issue ... can I close this?

[jaqua]

@6543 I need to use docker command inside of my own image. So Docker Buildx is not an option for me. I'm running a monorepo and in my CI I will build all affected apps. But running my script - which is working locally - will fail in the pipeline as I cannot set the mtu.

Something about this:

https://github.com/drone/charts/pull/109/files

To ensure that the temporary Docker networks created by the runner also have the appropriate value, add DRONE_RUNNER_NETWORK_OPTS to the env section of your values.yaml file:

env:
  DRONE_RUNNER_NETWORK_OPTS: "com.docker.network.driver.mtu:12345"

I think I need an option to set the MTU for the woodpecker agent dind

[NPCDW]

If you can upgrade docker, then docker 24.0.0 solves this problem, you can configure /etc/docker/daemon.json, e.g.

{
  "mtu": 1450,
  "default-network-opts": {"bridge": {"com.docker.network.driver.mtu": "1450"}}
}

references:

• https://github.com/moby/moby/releases/tag/v24.0.0
• Introduce config option for default generic network options of newly created networks moby/moby#43197

[zc-devs]

Seems, this is not backend/kubernetes issue. Or is this a question? 🤔

[qwerty287]

Seems like a question that looks resolved to me. I'll close, please comment if it's not clear