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How do I stop Docker trying to pull from IPv6? (aussie.zone)
submitted 1 year ago by to c/selfhosted@lemmy.world
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I'm currently trying to install Docker on my old Raspberry Pi (3 Model B+) to host some personal projects. When I run docker run hello-world, I get:

Unable to find image 'hello-world:latest' locally
docker: Error response from daemon: Get "https://registry-1.docker.io/v2/library/hello-world/manifests/sha256:ec153840d1e635ac434fab5e377081f17e0e15afab27beb3f726c3265039cfff": dial tcp [2600:1f18:2148:bc00:eff:d3ae:b836:fa07]:443: connect: network is unreachable

My Internet connection does not support IPv6 at all, which would explain why this error occurs. But how do I force docker-pull to only use IPv4?

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[–] [S] 2 points 1 year ago (6 children)

Unfortunately not.

 docker run hello-world
Unable to find image 'hello-world:latest' locally
docker: Error response from daemon: Get "https://registry-1.docker.io/v2/library/hello-world/manifests/sha256:ec153840d1e635ac434fab5e377081f17e0e15afab27beb3f726c3265039cfff": dial tcp [2600:1f18:2148:bc00:eff:d3ae:b836:fa07]:443: connect: network is unreachable

Run 'docker run --help' for more information
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  • [–] 2 points 1 year ago (5 children)

    Well crap. Do you have no ipv6 address now in ip addr?

    Guess I gave Docker too much benefit of the doubt and assumed it should failover to v4 once v6 was disabled. Bad assumption on my part.

    Could it be a DNS problem? If you dig registry-1.docker.io +short does it return an ipv4 or v6 address?

    It looks like there have been sporadic reports of problems from people since last year.

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  • [–] 1 point 1 year ago (1 child)

    Try adding {"ipv6": false} to your /etc/docker/daemon.json file (create it if it doesnt exist), then restart docker with sudo systemctl restart docker - this forces docker to use IPv4 only.

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  • [–] [S] 1 point 1 year ago (2 children)

    Do you have no ipv6 address now in ip addr

    Just comparing it by eye, there's no change.

    zag@raspberrypi:~ $ man dig
No manual entry for dig
zag@raspberrypi:~ $ which dig
zag@raspberrypi:~ $ sudo apt install dig
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package dig

    But if I ping it

    $ ping registry-1.docker.io
PING registry-1.docker.io (107.20.112.188) 56(84) bytes of data.
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