Failed to create network project_default: Error response from daemon: all predefined address pools have been fully subnetted

Docker Engine General
1 
├── external
│   └── Dockerfile
└── project
    ├── compose.yml
    └── Dockerfile

Let’s examine the contents of the files

+ cat external/Dockerfile
FROM scratch AS external

COPY <<EOF /test/external-hello
Hello!!!
EOF



+ cat project/compose.yml
services:
  hello:
    build:
      context: .
      additional_contexts:
        external: ../external
    command: cat /test/hello



+ cat project/Dockerfile
FROM scatch
COPY --from=external /test/external-hello /test/hello

Let’s do some tests

+ docker compose -f project/compose.yml run --rm hello
[+] Creating 1/0
 ✘ Network project_default  Error                                                                                 0.0s 
failed to create network project_default: Error response from daemon: all predefined address pools have been fully subnetted

Why?

2

Nothing to do with Dockerfiles. You probably run too many compose projects and there are no available ipranges left for your new projects. Delete the old networks.

3 
+ docker network prune
WARNING! This will remove all custom networks not used by at least one container.
Are you sure you want to continue? [y/N] y


+ docker compose -f project/compose.yml run --rm hello
[+] Creating 1/1
 ✔ Network project_default  Created                                                                               0.1s 
[+] Building 0.1s (5/5) FINISHED                                                                        docker:default
 => [hello internal] load build definition from Dockerfile                                                        0.0s
 => => transferring dockerfile: 104B                                                                              0.0s
 => [hello context external] load .dockerignore                                                                   0.0s
 => => transferring external: 2B                                                                                  0.0s
 => [hello internal] load .dockerignore                                                                           0.0s
 => => transferring context: 2B                                                                                   0.0s
 => [hello context external] load from client                                                                     0.0s
 => => transferring external: 2B                                                                                  0.0s
 => ERROR [hello stage-0 1/1] COPY --from=external /test/external-hello /test/hello                               0.0s
------
 > [hello stage-0 1/1] COPY --from=external /test/external-hello /test/hello:
------
failed to solve: failed to compute cache key: failed to calculate checksum of ref 2f3be2ff-461b-400a-9dc7-67650870d8fb::oqy8sq0jiuj15v75fsw7up18j: "/test/external-hello": not found

So what is the purpose of what is written here docker - Can a Dockerfile extend another one? - Stack Overflow ?

4

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