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Based on golang/go#13598, I should be able to disable the http2 client with:

GODEBUG=h2client=0 go run get.go

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steps:
  - command: echo hello world
    agents:
      queue: "${BUILDKITE_AGENT_META_DATA_QUEUE:-default}"
    plugins:
      - "docker#d2c3221":
          image: "microsoft/windowsservercore:ltsc2016"
          debug: true

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steps:
  - command: echo hello world
    parallelism: 4
    plugins:
      - docker#v1.4.0:
          image: "alpine:latest"

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#!/bin/bash
set -euo pipefail

input="$(cat <&0)"

if [[ "${COMPARE_EVAL:-}" == "1" ]] ; then
  printf 'parsing of args with native bash eval:\n\n'
  eval "array=($input)"
  for token in "${array[@]}"; do
    printf '[%q]\n' "$token"

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steps:
  - command: sleep 60

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Overview

We have an autoscaling group of m5.large instances with 250GB EBS root volumes that we use for running our Buildkite test suites. This group scales up from 0 to 40 during the work day and then down again, so each day we see new instances.

We've been seeing every few days that a few of the instances run very, very slowly. Our test suite either takes 100x it's usual time or times out entirely. On the host machine, a basic command like aws s3api head-object --bucket blah --key blah will take 45 seconds.

All instances are m5.large in us-east-1 running the latest Amazon Linux 2 ami-06631de3819cb42f3

Tests

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FROM lgatica/openssh-client:latest

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steps:
  - command: test.sh
    plugins:
      docker-compose#v2.4.1:
        run: app

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Often inside a docker container one wants to run specific commands on the host. binproxy provides a way to allow specific command invocations inside a docker container that proxies to commands on the host:

commands:
  buildkite-agent:
    parameters:
      - regexp: '^meta-data (set|get)'
    env:
      - BUILDKITE_AGENT_ACCESS_TOKEN

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#!/bin/bash

buildkite-agent artifact download test.txt .
cat test.txt