How to build an image of Postgres:11 with HLL extension? - postgresql

Question

I want to make a Dockerfile to build an image of Postgres:11 that already installed postgresql-hll extension inside.
Im not experienced with Docker so Im have no idea to follow the instruction of installing this extension properly.

Answer 1

In order to do this you need to:
clone the git repository:
git clone https://github.com/citusdata/postgresql-hll.git
Create a file called Dockerfile (at the same level with the folder postgresql-hll created at step 1) with the contents:
ARG psversion=11
FROM postgres:$psversion
COPY postgresql-hll /postgresql-hll
RUN apt-get update -y && apt-get install -y postgresql-server-dev-${PG_MAJOR} make gcc g++
WORKDIR /postgresql-hll
RUN PG_CONFIG=/usr/bin/pg_config make
RUN PG_CONFIG=/usr/bin/pg_config make install
RUN echo "shared_preload_libraries = 'hll'" >> /usr/share/postgresql/postgresql.conf.sample
COPY create_extension.sql /docker-entrypoint-initdb.d/
Create a file create_extension.sql at the same level with the Dockerfile, with the contents:
CREATE EXTENSION hll;
Build your image:
# build for POSTGRES 11
docker build -t hll:1.0 --build-arg psversion=11 .
# build for POSTGRES 9.6
docker build -t hll:1.0 --build-arg psversion=9 .
NOTE: The version for POSTGRES 9.6 gives an error when trying to load the library. It is here for completeness and maybe somebody can contribute to fix it.
Run a container based on this image
docker run -d --name hll hll:1.0
Open a shell in the newly created container:
docker exec -ti hll bash
Inside the container run:
su postgres
psql
\dx
The output should show the hll extension as installed.