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ci: pull Docker Hub images through mirror.gcr.io #930

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ci: pull Docker Hub images through mirror.gcr.io
solace-aross Oct 9, 2026
9f1903f
ci: name the mirror step and report a missing mirror
solace-aross Oct 10, 2026
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29 changes: 29 additions & 0 deletions .github/actions/docker-hub-mirror/action.yml
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name: Docker Hub mirror
description: Pulls Docker Hub images through mirror.gcr.io, so CI does not hit Docker Hub's anonymous pull limit.
runs:
using: composite
steps:
- name: Configure Docker Hub mirror
shell: bash
run: |
set -euo pipefail
conf=/etc/docker/daemon.json
tmp=$(mktemp)
merged=$(mktemp)
# Keep any settings the runner image already has.
if sudo test -s "${conf}"; then
sudo cat "${conf}" >"${tmp}"
else
echo '{}' >"${tmp}"
fi
jq '(."registry-mirrors" // []) as $m | ."registry-mirrors" = $m + (["https://mirror.gcr.io"] - $m)' "${tmp}" >"${merged}"
sudo install -D -m 644 "${merged}" "${conf}"
rm -f "${tmp}" "${merged}"
sudo systemctl restart docker
# The daemon pulls from the mirror first and falls back to Docker Hub
# when the mirror misses or is down. Fail here, not on a later 429, if
# the setting did not take.
docker info | grep -A2 'Registry Mirrors' || true
mirrors=$(docker info --format '{{range .RegistryConfig.Mirrors}}{{println .}}{{end}}')
grep -q 'mirror.gcr.io' <<<"${mirrors}" \
|| { echo "::error::mirror.gcr.io is not in the Docker daemon config"; exit 1; }
10 changes: 10 additions & 0 deletions .github/workflows/ci.yml
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Expand Up @@ -173,6 +173,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
with:
just-version: 1.58.0
Expand Down Expand Up @@ -349,6 +350,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
with:
just-version: 1.58.0
Expand Down Expand Up @@ -432,6 +434,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
with:
just-version: 1.58.0
Expand Down Expand Up @@ -562,6 +565,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
# release's static musl binaries, as dist/linux/<arch>/nisshi.
- uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
with:
Expand All @@ -580,6 +584,10 @@ jobs:
- uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1
with:
buildkitd-flags: --debug
# BuildKit pulls base images itself, so it ignores the daemon's mirror.
buildkitd-config-inline: |
[registry."docker.io"]
mirrors = ["mirror.gcr.io"]
- uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
with:
registry: ${{env.REGISTRY}}
Expand Down Expand Up @@ -640,6 +648,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
with:
just-version: 1.58.0
Expand Down Expand Up @@ -737,6 +746,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
with:
just-version: 1.58.0
Expand Down
3 changes: 3 additions & 0 deletions .github/workflows/tier-c.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
with:
just-version: 1.58.0
Expand Down Expand Up @@ -133,6 +134,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
with:
just-version: 1.58.0
Expand Down Expand Up @@ -202,6 +204,7 @@ jobs:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
with:
persist-credentials: false
- uses: ./.github/actions/docker-hub-mirror
- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4.0.0
with:
just-version: 1.58.0
Expand Down
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