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add support for DOCKER_CUSTOM_HEADERS env-var (experimental)

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This environment variable allows for setting additional headers
to be sent by the client. Headers set through this environment
variable are added to headers set through the config-file (through
the HttpHeaders field).

This environment variable can be used in situations where headers
must be set for a specific invocation of the CLI, but should not
be set by default, and therefore cannot be set in the config-file.

WARNING: If both config and environment-variable are set, the environment
variable currently overrides all headers set in the configuration file.
This behavior may change in a future update, as we are considering the
environment variable to be appending to existing headers (and to only
override headers with the same name).

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn
2024-05-31 13:04:52 +02:00
parent cd92610bca
commit 6638deb9d6
5 changed files with 153 additions and 5 deletions
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docs/reference/dockerd.md
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@ -133,9 +133,8 @@ to [the `daemon.json` file](#daemon-configuration-file).
The following list of environment variables are supported by the `dockerd` daemon.
Some of these environment variables are supported both by the Docker Daemon and
the `docker` CLI. Refer to [Environment variables](https://docs.docker.com/reference/cli/docker/#environment-variables)
in the CLI section to learn about environment variables supported by the
`docker` CLI.
the `docker` CLI. Refer to [Environment variables](https://docs.docker.com/engine/reference/commandline/cli/#environment-variables)
to learn about environment variables supported by the `docker` CLI.
| Variable | Description |
| :------------------ | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |