nietaki
Workaround for Docker with Erlang/OTP 21.3
Just a quick heads up: There seems to be a bug in Erlang/OTP 21.3, which can cause some errors when making http requests. If you’re using the official Elixir images that use Erlang/OTP 21 it might affect your app, because they got rebuilt with the latest version that contains the bug.
The quickest workaround is to instead of using FROM elixir:1.7.4 in your Dockerfile, replicate the elixir image layer and point it to an earlier image, for example 21.2.7:
FROM erlang:21.2.7
# elixir expects utf8.
ENV ELIXIR_VERSION="v1.7.4" \
LANG=C.UTF-8
RUN set -xe \
&& ELIXIR_DOWNLOAD_URL="https://github.com/elixir-lang/elixir/archive/${ELIXIR_VERSION}.tar.gz" \
&& ELIXIR_DOWNLOAD_SHA256="c7c87983e03a1dcf20078141a22355e88dadb26b53d3f3f98b9a9268687f9e20" \
&& curl -fSL -o elixir-src.tar.gz $ELIXIR_DOWNLOAD_URL \
&& echo "$ELIXIR_DOWNLOAD_SHA256 elixir-src.tar.gz" | sha256sum -c - \
&& mkdir -p /usr/local/src/elixir \
&& tar -xzC /usr/local/src/elixir --strip-components=1 -f elixir-src.tar.gz \
&& rm elixir-src.tar.gz \
&& cd /usr/local/src/elixir \
&& make install clean
CMD ["iex"]
Posting it here, because I know it affected more than just myself, might save some of you some time.
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shanesveller
The historical version of the official image that included OTP 21.2.6 can be obtained by referring to this image syntax:
elixir:1.8.1-alpine@sha256:f6a0647245a467f7affee2e635341eb40d4b9dee88467f3b14a30707dbd21308
This syntax is compatible with, among others, docker pull, docker run, FROM in a Dockerfile, and Kubernetes manifests. The checksum is output whenever you pull an image via the normal docker pull CLI, and is also available after the fact via docker inspect $imageID under the RepoDigests key.
You can bulk check your image tags and digests like this, which may catch historical copies that were untagged by a subsequent pull:
docker images elixir -q | xargs -n1 docker inspect | jq ".[] | { tag: .RepoTags[0], digest: .RepoDigests[0] }"
engineeringdept
Thanks - I got bit by this too. If you’re using Elixir 1.8.1, I made an image over here: tomtaylor/elixir - Docker Image (using this Dockerfile: GitHub - breakroom/elixir-docker-image · GitHub)
shanesveller
This is part of why treating specific Docker image tags as mutable is so dangerous. When I’m in front of a computer I can check if I still have the correct SHA256 image checksums for the prior version that used OTP 21.2.x, because I pin them in my FROM lines after experiences similar to this.
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