How to upgrade memory of the container?

[kenorb]

Currently the Docker container has 2GB memory and 1GB of swap. How can I increase it?

I've tried to add memory, memory_swap or memory_kernel to platforms section, none of it works, and it breaks the test.

# molecule/default/molecule.yml
---
dependency:
  name: galaxy
driver:
  name: docker
platforms:
  - command: /lib/systemd/systemd
    dockerfile: ../../Dockerfile.j2
    image: ubuntu:18.04
    memory: 4096
    memory_swap: 4096
    name: bionic
    privileged: true
    volumes:
      - /sys/fs/cgroup:/sys/fs/cgroup:ro
...

The error which I'm getting (which doesn't tell what's wrong):

% molecule create
...
    TASK [Determine the CMD directives] ********************************************
    ok: [localhost] => (item=None)
    ok: [localhost]

    TASK [Create molecule instance(s)] *********************************************
    changed: [localhost] => (item=bionic)

    TASK [Wait for instance(s) creation to complete] *******************************
    FAILED - RETRYING: Wait for instance(s) creation to complete (300 retries left).
    failed: [localhost] (item=None) => {"attempts": 2, "censored": "the output has been hidden due to the fact that 'no_log: true' was specified for this result", "changed": false}
fatal: [localhost]: FAILED! => {"censored": "the output has been hidden due to the fact that 'no_log: true' was specified for this result", "changed": false}

    PLAY RECAP *********************************************************************
    localhost                  : ok=6    changed=2    unreachable=0    failed=1    skipped=2    rescued=0    ignored=0

It only fails when added memory options, so I assume it's not supported? However by looking at GH-2645, it should work.

I'm using:

molecule 3.0.8
   ansible==2.9.13 python==3.8

I've upgraded to 3.1.5, the same error happens.

molecule 3.1.5
    ansible:2.9.13 python:3.8
    delegated:3.1.5 from molecule
    docker:0.2.4 from molecule_docker

[apatard]

It may not be your issue but please check your configuration for these settings. From the documentation:

- memory
        Memory limit in format `<number>[<unit>]'. Number is a positive integer. Unit can be `B' (byte), `K' (kibibyte, 1024B), `M' (mebibyte), `G' (gibibyte), `T'
        (tebibyte), or `P' (pebibyte).
        Omitting the unit defaults to bytes.
        [Default: 0]
        type: str
- memory_swap
        Total memory limit (memory + swap) in format `<number>[<unit>]'. Number is a positive integer. Unit can be `B' (byte), `K' (kibibyte, 1024B), `M' (mebibyte),
        `G' (gibibyte), `T' (tebibyte), or `P' (pebibyte).
        Omitting the unit defaults to bytes.
        [Default: (null)]
        type: str

So, if I got it right, you're asking for a container with 4MB, without swap. From a quick test with 4096 for both settings without units, I'm getting:

"Error creating container: 400 Client Error: Bad Request (\"Minimum memory limit allowed is 4MB\")"

[kenorb]

I've specified memory: 4G, but the memory is still 2G (I've run destroy and create).

% docker ps
CONTAINER ID        IMAGE                         COMMAND                  CREATED             STATUS              PORTS               NAMES
56da146e7a03        molecule_local/ubuntu:18.04   "/lib/systemd/systemd"   3 seconds ago       Up 2 seconds                            bionic
% docker exec -it 56da146e7a03 bash
root@bionic:/# free -m
              total        used        free      shared  buff/cache   available
Mem:           1987         215        1528           0         243        1636
Swap:          1023         196         827

Any suggestions why?

[apatard]

Free is not the way to check the limit. Look at /sys/fs/cgroup/memory/memory.limit_in_bytes and /sys/fs/cgroup/memory/memory.memsw.limit_in_bytes. As regards the 2G value, I've no idea. It may be https://docs.docker.com/docker-for-mac/#resources but it may be something else.

[kenorb]

My issue was that memory and swap were limited by the Docker CE Desktop. After changing in the app, the changes in the code worked:

To debug, run molecule --debug create which calls /usr/local/lib/python*/site-packages/molecule_docker/playbooks/create.yml which calls docker_container role (although not all the params are passed through).

Here is the example of molecule/default/molecule.yml:

---
driver:
  name: docker
platforms:
  - command: /lib/systemd/systemd
    dockerfile: ../../../common/molecule/Dockerfile.j2
    image: ubuntu:18.04
    memory: 4G
    memory_swap: 4G
    name: bionic
    privileged: true
    volumes:
      - /sys/fs/cgroup:/sys/fs/cgroup:ro