Selfhosted

50533 readers

454 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.
No spam posting.
Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.
Don't duplicate the full text of your blog or github here. Just post the link for folks to click.
Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).
No trolling.

Resources:

selfh.st Newsletter and index of selfhosted software and apps
awesome-selfhosted software
awesome-sysadmin resources
Self-Hosted Podcast from Jupiter Broadcasting

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 2 years ago

MODERATORS

HybridSarcasm@lemmy.world

HybridSarcasm@lemmy.hybridsarcasm.xyz

How do I stop Docker trying to pull from IPv6? (aussie.zone)

submitted 5 days ago by Zagorath@aussie.zone to c/selfhosted@lemmy.world

36 comments fedilink hide all child comments

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?

you are viewing a single comment's thread
view the rest of the comments

[–] iglou@programming.dev 2 points 4 days ago* (last edited 4 days ago) (1 children)

I have read the rest of the comments to see what you already tried. I was about yo tell you to use sysctl to disable ipv6 but it looks like that is already done.

As a matter of fact, it looks like you have no ipv6 address at all. Which makes me think that your DNS config might be off, as it shouldn't even attempt an ipv6 resolution.

Can you show me the content of /etc/resolv.conf ?

Also install "dig" if you dont have it already and show the output of

dig registry-1.docker.io

[–] Zagorath@aussie.zone 1 points 4 days ago* (last edited 4 days ago) (1 children)

$ dig registry-1.docker.io

; <<>> DiG 9.18.33-1~deb12u2-Debian <<>> registry-1.docker.io
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50801
;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;registry-1.docker.io.          IN      A

;; ANSWER SECTION:
registry-1.docker.io.   33      IN      A       54.210.249.78
registry-1.docker.io.   33      IN      A       44.218.153.24
registry-1.docker.io.   33      IN      A       107.20.112.188
registry-1.docker.io.   33      IN      A       34.234.222.10
registry-1.docker.io.   33      IN      A       34.195.83.243
registry-1.docker.io.   33      IN      A       52.21.128.203
registry-1.docker.io.   33      IN      A       52.0.248.137
registry-1.docker.io.   33      IN      A       52.207.69.161

;; Query time: 47 msec
;; SERVER: 192.168.20.1#53(192.168.20.1) (UDP)
;; WHEN: Tue Aug 12 22:27:45 AEST 2025
;; MSG SIZE  rcvd: 177
$ cat /etc/resolv.conf
# Generated by NetworkManager
search Home
nameserver 192.168.20.1

edit: oh, and in my router's configuration:

Primary DNS Server:9.9.9.9
Secondary DNS Server:1.1.1.1

[–] iglou@programming.dev 2 points 4 days ago (1 children)

Well this is getting weird.

Have you tried checking if your os has a resolution cashe active? If so, try to flush it.

[–] Zagorath@aussie.zone 1 points 4 days ago* (last edited 4 days ago) (1 children)

I never set one up myself, and this 11 year-old thread implies that Raspbian doesn't have one set up by default. It is a very old thread though, so could be wrong.

edit: this is more recent and also says Raspbian doesn't have DNS caching by default

[–] iglou@programming.dev 2 points 4 days ago (1 children)

At this point I am assuming that it is actually a docker issue.

Can you show your docker daemon configuration?

Hard to tell where it is on your machine. Try ~/.docker/daemon.json, or maybe /etc/docker/daemon.json... Else look for it haha

[–] Zagorath@aussie.zone 1 points 4 days ago

There's a ~/.docker/config.json. In that there're some auths, with keys https://index.docker.io/v1/, https://index.docker.io/v1/access-token, and https://index.docker.io/v1/refresh-token, and then there's "currentContext": "rootless".

There's ~/.docker/contexts/meta/[a long hex string]/meta.json, with {"Name":"rootless","Metadata":{"Description":"Rootless mode"},"Endpoints":{"docker":{"Host":"unix:///run/user/1000/docker.sock","SkipTLSVerify":false}}}.

The only file in /etc/docker is key.json.