Is it possible to load a redis module (redisbloom) onto a redis helm chart (bitnami/redis or bitnami/redis-cluster)?

Question

I am trying to add the redisbloom module to a redis helm chart (bitnami/redis), or ideally the redis cluster chart (bitnami/redis-cluster).

# Chart.yaml

apiVersion: v2
name: my-app
description: My app and redis (with redisbloom module loaded)
type: application
version: 0.1.0
appVersion: 0.1.0
dependencies:
  - name: redis
    alias: redisbloom
    version: 12.1.1
    repository: https://charts.bitnami.com/bitnami

Copying the compiled module redisbloom.so to each pod, and then loading the module either post-start or with master.command=redis-server --load-module=<path>/redisbloom.so seemed like it could be a potential solution - however from the documentation I can't see how to copy the binary across for a chart.

I'm also not sure this would be enough on it's own for a master-slave or cluster situation to work. This Github issue suggests it should be possible to do - but alas there is no documentation that I can find to support it.

Is it possible? Or would I need to create a custom chart, for example, using the RedisBloom docker image [redislabs/rebloom]?

Thanks in advance.

Answer 1

I think you need to build custom redis image based on bitnami image with required module and after that use extraVars var to specify your module like: --loadmodule /usr/lib/redis/modules/redisearch.so

My Dockerfile for that (I need to have redisearch module):

#### My customization
FROM redislabs/redisearch:latest AS moduleimg
#### End of
FROM docker.io/bitnami/minideb:buster
LABEL maintainer "Bitnami <[email protected]>"

ENV HOME="/" \
    OS_ARCH="amd64" \
    OS_FLAVOUR="debian-10" \
    OS_NAME="linux"

COPY prebuildfs /
# Install required system packages and dependencies
RUN install_packages acl ca-certificates curl gzip libc6 libssl1.1 procps tar wget
RUN . /opt/bitnami/scripts/libcomponent.sh && component_unpack "wait-for-port" "1.0.0-3" --checksum 7521d9a4f9e4e182bf32977e234026caa7b03759799868335bccb1edd8f8fd12
RUN . /opt/bitnami/scripts/libcomponent.sh && component_unpack "redis" "6.2.1-0" --checksum c104089841a906f944e285828a580968608017340b67befaa1771646cbfdf6b3
RUN . /opt/bitnami/scripts/libcomponent.sh && component_unpack "gosu" "1.12.0-2" --checksum 4d858ac600c38af8de454c27b7f65c0074ec3069880cb16d259a6e40a46bbc50
RUN chmod g+rwX /opt/bitnami
RUN ln -s /opt/bitnami/scripts/redis/entrypoint.sh /entrypoint.sh
RUN ln -s /opt/bitnami/scripts/redis/run.sh /run.sh

COPY rootfs /
RUN /opt/bitnami/scripts/redis/postunpack.sh
ENV BITNAMI_APP_NAME="redis" \
    BITNAMI_IMAGE_VERSION="6.2.1-debian-10-r14" \
    PATH="/opt/bitnami/common/bin:/opt/bitnami/redis/bin:$PATH"

### My customization
RUN mkdir /opt/bitnami/redis/modules
COPY --from=moduleimg /usr/lib/redis/modules/redisearch.so* /opt/bitnami/redis/modules
### End of

EXPOSE 6379

USER 1001
ENTRYPOINT [ "/opt/bitnami/scripts/redis/entrypoint.sh" ]
CMD [ "/opt/bitnami/scripts/redis/run.sh" ]