build(base-image): make apt install resilient to transient mirror failures - #42221
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…lures ubuntu:24.04 ships no apt retry config (default is 0 retries), so a single dropped connection to the Ubuntu mirrors fails the whole base-image build. Recent flake: appsmith-ee run 34570186320 (IPv6 unreachable + IPv4 timeouts to archive.ubuntu.com), and a same-SHA run failed then passed on 2026-09-05. - Add a build-scoped apt drop-in (Acquire::Retries 3 + http/https Timeout 30s), removed in the same layer's cleanup so the shipped image is unchanged. - Add --retry/--retry-connrefused/--connect-timeout/--retry-max-time to the MongoDB and PostgreSQL GPG-key curls; add --fail to the PostgreSQL one so an HTTP error body is never piped into apt-key. Reduces flake frequency for transient mirror blips; does not rescue a sustained egress outage. CE-only: apt block is byte-identical CE/EE, sync carries to EE. Linear: APP-15960
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. WalkthroughThe Docker base image build now applies retry and timeout settings to APT and download commands. Signing-key and Java archive downloads now handle failures explicitly. Temporary files and APT settings are cleaned up. ChangesDocker build download reliability
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to The change adds bounded retries and explicit download failure handling for Docker build dependencies, with no established remaining merge-blocking risk. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@deploy/docker/base.dockerfile`:
- Around line 73-76: Update the MongoDB and PostgreSQL signing-key download
pipelines in the Docker build so curl failures are propagated under Ubuntu’s
default /bin/sh; check each curl result separately or execute the pipelines
through Bash with pipefail, without adding set -o pipefail directly to the
existing /bin/sh chain.
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deploy/docker/base.dockerfile
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…piping Docker's default /bin/sh has no pipefail, so in 'curl ... | gpg/tar/apt-key' only the downstream command's exit code is checked. A curl failure (exhausted retries, partial download) can be silently swallowed if the downstream command exits 0 on incomplete input. Replace all three curl-pipe patterns with download-to-temp-file-then-process: - MongoDB GPG key: curl -o /tmp/... && gpg --dearmor /tmp/... - PostgreSQL GPG key: curl -o /tmp/... && apt-key add /tmp/... - Java JDK tarball: curl -o /tmp/... && tar -xzf /tmp/... && rm /tmp/... This ensures curl's exit code hits the && chain directly. Temp files are cleaned by the existing rm -rf /tmp/* (apt layer) or explicit rm (Java layer). Also adds --fail and retry flags to the Java curl, which had neither. Addresses CodeRabbit review feedback on #42221.
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Description
TL;DR: Make the base-image
aptinstall resilient to transient Ubuntu-mirror connection failures, so a momentary network blip on the build host doesn't red the wholeDocker Base Imagebuild.Background / root cause
The
Docker Base Imageworkflow (deploy/docker/base.dockerfile) intermittently fails at the apt dependency-install layer when the builder briefly can't reach the Ubuntu mirrors. Most recent example: appsmith-ee run 34570186320 failed twice withconnect (101: Network is unreachable)(IPv6) andconnection timed out(IPv4) toarchive.ubuntu.com/security.ubuntu.com. The same base-image build has flaked on apt before (a same-SHA run failed, then passed, on 2026-09-05).Verified cause:
ubuntu:24.04ships no apt retry configuration —apt-config dumpshows noAcquire::Retriesand there is no drop-in in/etc/apt/apt.conf.d/, so the compiled default of 0 retries applies. A single dropped connection fails the build. The two GPG-keycurlfetches also had no retry, and the PostgreSQL one lacked--fail(so an HTTP error body could be piped intoapt-key).Changes (
deploy/docker/base.dockerfile, apt layer only)Acquire::Retries "3"+Acquire::http(s)::Timeout "30". It is deleted in the same layer's cleanup (rm -rf), so the shipped image's apt behavior is unchanged.--retry 3 --retry-connrefused --connect-timeout 15 --retry-max-time 60to the MongoDB and PostgreSQL key-fetch curls; add--failto the PostgreSQL one.Acquire::ForceIPv4(IPv4 also timed out in the incident, so it wouldn't help), and no change to the deprecatedapt-keyusage (out of scope).This matches the retry pattern already used in this file (the Keycloak jar overlay uses
curl --fail --retry 3 --connect-timeout 15).Scope / honest limitation
This reduces flake frequency for transient mirror blips. It will not rescue a sustained multi-minute total egress outage — retries only help if egress recovers within the retry window. That class of failure is infra, not the Dockerfile.
Verification
ubuntu:24.04default confirmed: noAcquire::Retries, no apt.conf.d retry drop-in → default 0.\-continuation +printfdrop-in + cleanup) withdocker build:apt-config dumpreportsAcquire::Retries "3"; the drop-in is removed by cleanup (test ! -fpasses); build prints success. BuildKit strips the inline#comment lines before the shell runs (same idiom already in this file).curlflags accepted byubuntu:24.04's curl (connect failure exit 7 with 3 retries observed; no unknown-option error).Impact on existing instances
None. The drop-in is created and deleted within the same build layer, so the produced image is byte-equivalent in apt configuration to before. Fresh install, upgrade-from-default, upgrade-from-customized, and rollback are all unaffected (this only changes how the base image is built, not its contents).
Reviewers / second opinion
Approach independently reviewed by GPT-5.6 sol and reconciled: retries tuned to 3 (not 5),
Acquire::Retries::Delaydropped as redundant, drop-in build-scoped rather than persisted,--failnot duplicated on the mongo curl (already has-f), curl retries bounded, IPv4 not forced.Linear: https://linear.app/appsmith/issue/APP-15960
Automation
/ok-to-test tags="@tag.All"
Communication
Should the DevRel and Marketing teams inform users about this change?
Summary by CodeRabbit
Chores
Fixes https://linear.app/appsmith/issue/APP-15960/base-image-build-make-apt-install-resilient-to-transient-mirror
Warning
Tests have not run on the HEAD 1d82958 yet
Wed, 16 Sep 2026 07:48:45 UTC