Create lambda layer from docker image

create_layer.sh

#!/bin/sh -e

mkdir -p "$DIST_DIR/lib"
mkdir -p "$DIST_DIR/ruby/gems"

docker build -t $CONTAINER_NAME -f Dockerfile .
CONTAINER=$(docker run -d ruby-builder)

# See https://northsail.io/articles/aws-lambda-ruby-2-7-pg-gem-libldap-error
docker cp \
  $CONTAINER:/usr/lib64/libpq.so.5.14 \
  $DIST_DIR/lib/libpq.so.5

docker cp \
  $CONTAINER:/usr/lib64/libldap_r-2.4.so.2.10.7 \
  $DIST_DIR/lib/libldap_r-2.4.so.2

docker cp \
  $CONTAINER:/usr/lib64/liblber-2.4.so.2.10.7 \
  $DIST_DIR/lib/liblber-2.4.so.2

docker cp \
  $CONTAINER:/usr/lib64/libsasl2.so.3.0.0 \
  $DIST_DIR/lib/libsasl2.so.3

docker cp \
  $CONTAINER:/usr/lib64/libssl3.so \
  $DIST_DIR/lib/

docker cp \
  $CONTAINER:/usr/lib64/libsmime3.so \
  $DIST_DIR/lib/

docker cp \
  $CONTAINER:/usr/lib64/libnss3.so \
  $DIST_DIR/lib/

docker cp \
  $CONTAINER:/usr/lib64/libnssutil3.so \
  $DIST_DIR/lib/

docker cp \
  $CONTAINER:/var/task/vendor/bundle/ruby/3.2.0 \
  $DIST_DIR/ruby/gems/3.2.0

Dockerfile

FROM public.ecr.aws/sam/build-ruby3.2:latest-x86_64

RUN yum install -y amazon-linux-extras && amazon-linux-extras enable postgresql14
RUN yum install -y postgresql postgresql-devel build-essential

ADD Gemfile /var/task/Gemfile
ADD Gemfile.lock /var/task/Gemfile.lock

RUN bundle config set --local deployment true
RUN bundle install