Docker service error "docker: not found"

Drone Support
1

Hello,

I just upgraded to v 1.0 (I did a fresh installation) I really like the new UI, I want to use cross to cross build some Rust binaries, the thing is that cross needs the Docker deamon to work, so I tried to add Docker service like described here, but for somehow I have docker: not found when I try to execute Docker commands, here is my .drone.yml file, am I missing something? (The repository is trusted by the way)

kind: pipeline
name: default

steps:
- name: build
  image: rustlang/rust:nightly
  volumes:
    - name: dockersock
      path: /var/run/docker.sock
  commands:
    - docker ps -a

volumes:
  - name: dockersock
    host:
      path: /var/run/docker.sock

thank you

2

I have docker: not found when I try to execute Docker commands, here is my .drone.yml file, am I missing something?

yes, it would appear rustlang/rust:nightly does not have a docker executable available inside the image. You should instead use an image that includes the docker executable, such as the official docker image. You can see a working example at https://docs.drone.io/examples/service/docker/

3

Ah got you, in that case why we’ll need to share the docker sock if the image already have it?

4

the docker image does not have anything running inside of it, by default. So you would either need to mount the host machine docker socket or start docker in a service container.

5

Yes I was thinking about mounting the host machine docker socket (I think that’s what I did in the .drone.yml file) but I still can’t use it in the loaded container?

6

sorry, not sure I understand the question, however, we provide an example that demonstrates how to mount the host machine docker socket to use Docker in a pipeline step. https://docs.drone.io/examples/service/docker/

7

Sorry for that, the question is for a pipeline with a given image (that doesn’t contains Docker) if I mount the host machine docker socket like your example, I can use docker commands in that pipeline?

8

Doing an analogy with travis, for example here is a pipeline based on ruby image and that use Docker as service to execute Docker commands in that pipeline even if the image doesn’t contains Docker:

language: ruby

services:
  - docker
before_install:
  - docker pull carlad/sinatra
9

docker is a program installed at /bin/docker. If /bin/docker does not exist in your image, you cannot execute docker commands.

if you want to use an image with /bin/docker pre-installed, you can use the docker image.

10

So the ideal in this case is to build a custom image based on Docker image, and install rust on it, right?

11

do you have much docker experience? Why do you need a rust container to execute Docker commands?

12

It’s just I’m used to do that with travis like the example I put before, and here I need to run Docker with Rust image due to cross that needs Docker behind the scenes to cross compile Rust binaries, you can see it here

13

I am having a hard time understanding what you are trying to do because the example only shows docker ps. I need more details to help you. What commands would you run locally to build the project (e.g. on your laptop)?

14

The docker ps was just to test if I have access to Docker or not, but the real command in this case would be a cross build --target x86_64-unknown-linux-gnu for example

15

I ended up building a custom image that contains Docker with a wrapper script and Rust :slight_smile:

16

ok great :slight_smile: sorry, I meant to reply back and suggest this approach. Glad you got it working.

1 Like
17

No worries, Thanks for the help :wink: