[Bug]: panic: rootless Docker not found with Colima on macos

[kldavis4]

Testcontainers version

0.35.0

Using the latest Testcontainers version?

Yes

Host OS

macos 14.7.1

Host arch

arm

Go version

1.22.5

Docker version

Client: Docker Engine - Community
 Version:           26.1.1
 API version:       1.45
 Go version:        go1.22.2
 Git commit:        4cf5afaefa
 Built:             Tue Apr 30 11:40:03 2024
 OS/Arch:           darwin/arm64
 Context:           colima

Server: Docker Engine - Community
 Engine:
  Version:          26.1.1
  API version:      1.45 (minimum version 1.24)
  Go version:       go1.21.9
  Git commit:       ac2de55
  Built:            Tue Apr 30 11:48:47 2024
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          1.6.31
  GitCommit:        e377cd56a71523140ca6ae87e30244719194a521
 runc:
  Version:          1.1.12
  GitCommit:        v1.1.12-0-g51d5e94
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

Docker info

Client: Docker Engine - Community
 Version:    26.1.1
 Context:    colima
 Debug Mode: false
 Plugins:
WARNING: Plugin "/Users/kelly/.docker/cli-plugins/docker-buildx" is not valid: failed to fetch metadata: fork/exec /Users/kelly/.docker/cli-plugins/docker-buildx: no such file or directory
WARNING: Plugin "/Users/kelly/.docker/cli-plugins/docker-compose" is not valid: failed to fetch metadata: fork/exec /Users/kelly/.docker/cli-plugins/docker-compose: no such file or directory

Server:
 Containers: 32
  Running: 3
  Paused: 0
  Stopped: 29
 Images: 130
 Server Version: 26.1.1
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: e377cd56a71523140ca6ae87e30244719194a521
 runc version: v1.1.12-0-g51d5e94
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.8.0-31-generic
 Operating System: Ubuntu 24.04 LTS
 OSType: linux
 Architecture: aarch64
 CPUs: 4
 Total Memory: 7.738GiB
 Name: colima
 ID: a1e9f622-0328-4fdb-bf48-7f0bf8bbd1b6
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

What happened?

Test fails with error in the subject.

Exporting export DOCKER_HOST=unix:///Users/kelly/.colima/default/docker.sock fixes the issue.

This doesn't seem like it should be necessary given the documentation here. When I run docker context ls I get:

NAME       DESCRIPTION                               DOCKER ENDPOINT                                   ERROR
colima *   colima                                    unix:///Users/kelly/.colima/default/docker.sock   
default    Current DOCKER_HOST based configuration   unix:///var/run/docker.sock                       
orbstack   OrbStack                                  unix:///Users/kelly/.orbstack/run/docker.sock 

Relevant log output

panic: rootless Docker not found

goroutine 1 [running]:
github.com/testcontainers/testcontainers-go/internal/core.MustExtractDockerHost.func1()
        /Users/kelly/projects/proxy/vendor/github.com/testcontainers/testcontainers-go/internal/core/docker_host.go:91 +0x78
sync.(*Once).doSlow(0x1?, 0x0?)
        /usr/local/go/src/sync/once.go:74 +0x100
sync.(*Once).Do(...)
        /usr/local/go/src/sync/once.go:65
github.com/testcontainers/testcontainers-go/internal/core.MustExtractDockerHost({0x102f879b0?, 0x1032e6460?})
        /Users/kelly/projects/proxy/vendor/github.com/testcontainers/testcontainers-go/internal/core/docker_host.go:88 +0x5c
github.com/testcontainers/testcontainers-go/internal/core.NewClient({0x102f879b0, 0x1032e6460}, {0x0, 0x0, 0x22900000000?})
        /Users/kelly/projects/proxy/vendor/github.com/testcontainers/testcontainers-go/internal/core/client.go:17 +0x9c
github.com/testcontainers/testcontainers-go.NewDockerClientWithOpts({0x102f879b0, 0x1032e6460}, {0x0, 0x0, 0x0})
        /Users/kelly/projects/proxy/vendor/github.com/testcontainers/testcontainers-go/docker_client.go:117 +0x4c
github.com/testcontainers/testcontainers-go.NewDockerProvider({0x14000120220, 0x2, 0x102dabb64?})
        /Users/kelly/projects/proxy/vendor/github.com/testcontainers/testcontainers-go/provider.go:143 +0x10c
github.com/testcontainers/testcontainers-go.ProviderType.GetProvider(0x0, {0x140002e4ed8, 0x1, 0x0?})
        /Users/kelly/projects/proxy/vendor/github.com/testcontainers/testcontainers-go/provider.go:114 +0x394
github.com/testcontainers/testcontainers-go.GenericContainer({_, _}, {{{{0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0}, ...}, ...}, ...})
        /Users/kelly/projects/proxy/vendor/github.com/testcontainers/testcontainers-go/generic.go:59 +0xf0
github.com/vercel/proxy/services/metadata/vercelaws/dynamo.TestMain(0x1400052e3c0)
        /Users/kelly/projects/proxy/services/metadata/vercelaws/dynamo/dynamo_test.go:30 +0x198
main.main()
        _testmain.go:49 +0x170

Additional information

No response

[timrutte]

Same issue for me.

[myazinn]

Also got this error. These two lines fixed the issue for me

export TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE=/var/run/docker.sock
export DOCKER_HOST="unix://${HOME}/.colima/docker.sock"

Thanks to this thread testcontainers/testcontainers-java#5034 (comment)