[solved] kubeneres docker plugins freezes building images, apk command

Drone Support
1

I’m running drone inside kubernetes. I installed it by hand, made the service/deployment for the drone/server and for the drone/drone-runner-kube (both using latest image).

I’m trying to build a docker image for an elixir/phoenix app using plugins/docker, but for some reason it seems to have different network issues:

  • apk add request hangs
  • curl gives OpenSSL SSL_connect: SSL_ERROR_SYSCALL
  • mix local.hex --force request timeouts
  • mix local.hex --force errors with (Mix) httpc request failed with: {:failed_connect, [{:to_address, {'repo.hex.pm', 443}}, {:inet, [:inet], :closed}]}

Dockerfile:

FROM elixir:1.9.2-alpine as deps
WORKDIR /opt/project/
RUN apk add curl
COPY mix.exs mix.lock ./
RUN mix local.hex --force
RUN mix deps.get --only prod

.drone.yml

---
kind: pipeline
type: kubernetes
name: default

steps:
- name: build-image
  image: plugins/docker
  settings:
    username:
      from_secret: docker_username
    password:
      from_secret: docker_password
    registry: registry.example.com
    repo: registry.example.com/project
    tags: latest
1 Like
2

Please note the kubernetes runner is still experimental. We are accepting pull requests at https://github.com/drone-runners/drone-runner-kube

3

Oh…

Did not know that, will try using some other runner to see if it is an issue with the kubernetes runner.

4

Solved the issue, it wasn’t the kubernetes runner fault.

Since I’m running docker in docker in docker (give or take a level) the docker daemon container created by plugins/docker is created with a bad MTU value of 1500 when it should be 1440 (at least in my case).

To fix it I just added this to my .drone.yml:

environment:
    PLUGIN_MTU: 1440

Source of my solution: https://medium.com/@liejuntao001/fix-docker-in-docker-network-issue-in-kubernetes-cc18c229d9e5

1 Like
5

also note that you can set the mtu value using the following setting (as opposed to using the environment variable):

steps:
- name: build
  image: plugins/docker
  settings:
    mtu: <value>
1 Like
6

had the same problem, drone’s docker plugin failing apparently after the APK command.
After trying everything for hours the above suggestion fixed it for me!
thanks!