docker-cli

Files

Sebastiaan van Stijn d738e7c489 docker info: skip API connection if possible

The docker info output contains both "local" and "remote" (daemon-side) information.
The API endpoint to collect daemon information (`/info`) is known to be "heavy",
and (depending on what information is needed) not needed.

This patch checks if the template (`--format`) used requires information from the
daemon, and if not, omits making an API request.

This will improve performance if (for example), the current "context" is requested
from `docker info` or if only plugin information is requested.

Before:

    time docker info --format '{{range  .ClientInfo.Plugins}}Plugin: {{.Name}}, {{end}}'
    Plugin: buildx, Plugin: compose, Plugin: scan,

    ________________________________________________________
    Executed in  301.91 millis    fish           external
       usr time  168.64 millis   82.00 micros  168.56 millis
       sys time  113.72 millis  811.00 micros  112.91 millis

    time docker info --format '{{json .ClientInfo.Plugins}}'

    time docker info --format '{{.ClientInfo.Context}}'
    default

    ________________________________________________________
    Executed in  334.38 millis    fish           external
       usr time  177.23 millis   93.00 micros  177.13 millis
       sys time  124.90 millis  927.00 micros  123.97 millis

    docker context use remote-ssh-daemon
    time docker info --format '{{.ClientInfo.Context}}'
    remote-ssh-daemon

    ________________________________________________________
    Executed in    1.22 secs   fish           external
       usr time  116.93 millis  110.00 micros  116.82 millis
       sys time  144.36 millis  887.00 micros  143.47 millis

And daemon logs:

    Jul 06 12:42:12 remote-ssh-daemon dockerd[14377]: time="2021-07-06T12:42:12.139529947Z" level=debug msg="Calling HEAD /_ping"
    Jul 06 12:42:12 remote-ssh-daemon dockerd[14377]: time="2021-07-06T12:42:12.140772052Z" level=debug msg="Calling HEAD /_ping"
    Jul 06 12:42:12 remote-ssh-daemon dockerd[14377]: time="2021-07-06T12:42:12.163832016Z" level=debug msg="Calling GET /v1.41/info"

After:

    time ./build/docker info --format '{{range  .ClientInfo.Plugins}}Plugin: {{.Name}}, {{end}}'
    Plugin: buildx, Plugin: compose, Plugin: scan,

    ________________________________________________________
    Executed in  139.84 millis    fish           external
       usr time   76.53 millis   62.00 micros   76.46 millis
       sys time   69.25 millis  723.00 micros   68.53 millis

    time ./build/docker info --format '{{.ClientInfo.Context}}'
    default

    ________________________________________________________
    Executed in  136.94 millis    fish           external
       usr time   74.61 millis   74.00 micros   74.54 millis
       sys time   65.77 millis  858.00 micros   64.91 millis

    docker context use remote-ssh-daemon
    time ./build/docker info --format '{{.ClientInfo.Context}}'
    remote-ssh-daemon

    ________________________________________________________
    Executed in    1.02 secs   fish           external
       usr time   74.25 millis   76.00 micros   74.17 millis
       sys time   65.09 millis  643.00 micros   64.44 millis

And daemon logs:

    Jul 06 12:42:55 remote-ssh-daemon dockerd[14377]: time="2021-07-06T12:42:55.313654687Z" level=debug msg="Calling HEAD /_ping"
    Jul 06 12:42:55 remote-ssh-daemon dockerd[14377]: time="2021-07-06T12:42:55.314811624Z" level=debug msg="Calling HEAD /_ping"

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

2021-07-06 17:04:34 +02:00

command

docker info: skip API connection if possible

2021-07-06 17:04:34 +02:00

compose

Support ulimits in docker stack deploy

2020-09-10 14:59:02 +02:00

config

cli/config/configfile: various test cleanups

2021-04-30 10:03:51 +02:00

connhelper

Use designated test domains (RFC2606) in tests