doc:proxy-setting info added in pull cmd.
Replace Note with a new secion, reduce characters in per line in 80. Add statement suggested by https://github.com/thaJeztah Signed-off-by: Lin Lu <doraalin@163.com>
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@ -27,6 +27,15 @@ can `pull` and try without needing to define and configure your own.
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To download a particular image, or set of images (i.e., a repository),
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use `docker pull`.
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## Proxy configuration
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If you are behind a HTTP proxy server, for example in corporate settings,
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before open a connect to registry, you may need to configure the Docker
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daemon's proxy settings, using the `HTTP_PROXY`, `HTTPS_PROXY`, and `NO_PROXY`
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environment variables. To set these environment variables on a host using
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`systemd`, refer to the [control and configure Docker with systemd](../../admin/systemd.md#http-proxy)
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for variables configuration.
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## Examples
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### Pull an image from Docker Hub
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