docker / docker/cli

verbose log for docker pull

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#4,161 0 comments 33 reactions 0 assignees View on GitHub

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area/ux kind/feature status/0-triage
Dominant language
Go
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Description

Description

i am in China and i set some registry mirrors in daemon.json, and can grep it from docker info

{
    "debug": true,
    "registry-mirrors": [
        "https://mirror.ccs.tencentyun.com",
        "https://mirror.baidubce.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://hub-mirror.c.163.com"
    ],
    "insecure-registries": ["192.168.1.102:8008"]
}

however when i run docker pull xxxxx, it is very very very slow, i want to know whether a registry mirror is used or which registry mirror is used when pulling.

i tried docker -D --log-level=debug pull supabase/postgres-meta:v0.60.7 or journalctl -f -u docker, but i can't find out what i want to know.

btw, how can i test a fastest registry mirror, or can docker choose a fastest one automatically ?

possible related issues:
#336
#2005

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the docker pull command and the debug output from docker -D --log-level=debug pull, then compare it with journalctl -f -u docker and the registry-mirrors shown by docker info. Review related issues #336 and #2005. Done should make the mirror used for a pull observable and clarify how mirror speed selection is handled.

Written by the indexing model from the issue text.

Assessment

Tech stack
docker, go
Domain
cli, devops
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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