Can't use curl inside a docker container that has installed it before

Question

I'm using RestHeart docker image.

From it's dockerfile :

FROM openjdk:8u111-jre-alpine

RUN apk upgrade --update && apk add --update libstdc++ curl ca-certificates bash

...

This means that curl is currently installed, right?

I run that image inside a Docker compose:

version: '3.4'
services:

  mongodb:
    image: mongo:4.0
    ports:
      - 27017:27017

  restheart:
    image: softinstigate/restheart:3.10.0
    ports:
      - 8082:8080
    volumes:
      - ./restheart:/opt/restheart/etc:ro
    depends_on:
      - mongodb

The container id for restheart container is e1a023d9a8a9 .

But when I execute docker exec e1a023d9a8a9 curl I get:

OCI runtime exec failed: exec failed: container_linux.go:346: starting container process caused "exec: \"curl\": executable file not found in $PATH": unknown

Answer 1

That Dockerfile is obsolete and I don't know why Docker Hub is still publishing that one, it's at least two years old!

The latest one is at https://github.com/SoftInstigate/restheart/blob/master/core/Dockerfile

It's for RESTHeart v5

As the base image is gcr.io/distroless/java:11 then it does not contain even the sh shell.

By the way, if someone could tell me how to update that Dockerfile that would be very helpful, I can't find any link in the Docker Hub dashboard.

---

UPDATE (24th may 2020)

Starting from RESTHeart 5.0.1 we have decide to move the Docker base image to adoptopenjdk:11-jre-hotspot-bionic . See the new Dockerfile .

Both the latest and 5.0.1 tags of softinstigate/restheart images are now based on the Ubuntu 18.04 LTS distribution.

The distroless image is still built (see distroless.Dockerfile ) and uploaded to Docker Hub, but it is tagged as distroless and 5.0.1-distroless to distinguish it from the default image.

Release notes: https://github.com/SoftInstigate/restheart/releases/tag/5.0.1

Docker hub: https://hub.docker.com/repository/docker/softinstigate/restheart

Answer 2

I noticed restheart is using distroless in their latest images. But I couldn't figure out why it's not allowing to exec in older images which are using alpine. Even no luck with entrypoint overriding.

    $ docker run -it --entrypoint=/bin/bash softinstigate/restheart:3.10.0 -c curl
docker: Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"/bin/bash\": stat /bin/bash: no such file or directory": unknown.
ERRO[0000] error waiting for container: context canceled 

But I built locally and it works.

$ git clone https://github.com/SoftInstigate/restheart.git
$ git checkout tags/4.0.0

The tag 3.10.0 is not available at the repo.

$ cd restheart/Docker

Add Dockerfile

$ docker build --build-arg RELEASE=3.10.0 -t harik8/restheart:latest .
$ docker run -it --entrypoint=/bin/bash harik8/restheart:latest -c curl
curl: try 'curl --help' or 'curl --manual' for more information