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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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[–] 2 points 1 year ago (3 children)

Even if it has an IPv6 address that can't route, it's odd that the OS isn't falling back to IPv4.

But disabling IPv6 in the OS should fix it, as this is not a docker problem.

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

    But disabling IPv6 in the OS should fix it

    I've already followed the instructions I could find to do that, but it didn't work. Either disabling IPv6 isn't the solution, or the instructions for how to disable it are incomplete. (You can see comments elsewhere in the thread for more detail.)

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  • [–] 3 points 1 year ago (1 child)

    Can you give us the full output of the following commands?

    ip addr

    sysctl net.ipv6.conf.all.disable_ipv6

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  • [–] [S] 2 points 1 year ago 
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether b8:27:eb:93:9b:06 brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.40/24 brd 192.168.20.255 scope global dynamic noprefixroute eth0
       valid_lft 81876sec preferred_lft 81876sec
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether b8:27:eb:c6:ce:53 brd ff:ff:ff:ff:ff:ff
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether ce:3e:0d:9b:fa:14 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever

    net.ipv6.conf.all.disable_ipv6 = 1
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