building a singularity image from docker hub postgres image

On 2024-01-30 15:52, Allan Kamau wrote:

I am trying to build a singularity image from postgres docker image.
I am issuing the command below.

$ singularity build /local/data/some/postgres.16.1.sif
docker://postgres/postgres:16.1

INFO: Starting build...
INFO: Fetching OCI image...
FATAL: While performing build: conveyor failed to get: GET
https://index.docker.io/v2/postgres/postgres/manifests/16.1:
UNAUTHORIZED:
authentication required; [map[Action:pull Class: Name:postgres/postgres
Type:repository]]

What is the url I should use?

Not personally familiar with Singularity, but this post looks like it
should help:

https://www.linuxwave.info/2022/04/running-postgresql-database-using.html

The example command they have there is:

singularity pull docker://postgres:14.2-alpine3.15

So the format of the url *seems* like it should be:

docker://postgres:16.1

That just pure guess work though. :)

Regards and best wishes,

Justin Clift

On Tue, Jan 30, 2024 at 12:27 PM Justin Clift <justin@postgresql.org> wrote:

On 2024-01-30 15:52, Allan Kamau wrote:

I am trying to build a singularity image from postgres docker image.
I am issuing the command below.

$ singularity build /local/data/some/postgres.16.1.sif
docker://postgres/postgres:16.1

INFO: Starting build...
INFO: Fetching OCI image...
FATAL: While performing build: conveyor failed to get: GET
https://index.docker.io/v2/postgres/postgres/manifests/16.1:
UNAUTHORIZED:
authentication required; [map[Action:pull Class: Name:postgres/postgres
Type:repository]]

What is the url I should use?

Not personally familiar with Singularity, but this post looks like it
should help:

https://www.linuxwave.info/2022/04/running-postgresql-database-using.html

The example command they have there is:

singularity pull docker://postgres:14.2-alpine3.15

So the format of the url *seems* like it should be:

docker://postgres:16.1

That just pure guess work though. :)

Regards and best wishes,

Justin Clift

Thanks Justin for the corrections and resources.
I have now put together the command below that does what I was looking for.

$ cd /tmp/;singularity pull postgres_16.1-alpine3.19.sif
docker://postgres:16.1-alpine3.19;

I am using the singularity container for the postgresql binaries instead
of having to install the binaries on the computer. For example I am using
pg_dump to take backups.

This could be of help to others, below is an example of using the
PostgreSQL binaries in the singularity image built from PostgreSQL docker
image.

##construct the singularity image
singularity_image_dfn="/local/data/bcl-sdv/singularity/pg";
mkdir -p "${singularity_image_dfn}";
date;time singularity build
"${singularity_image_dfn}"/postgres.16.1-alpine3.19.sif
docker://postgres/postgres:16.1-alpine3.19;date;

##Example usage of the singularity image
date;time {

singularity_image_fn="/local/data/bcl-sdv/singularity/pg/postgres_16.1-alpine3.19.sif";
date;time singularity exec \
--workdir /tmp \
"${singularity_image_fn}" \
"psql" \

"postgresql://someusername:somepassword@somehostname:5423/some_db_name"
\
"-c" \
"SELECT version();" \
;date;
};date;

Allan.