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Update offline-environment.md (#9481)

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This makes it more readable by explaining clearly what files are necessary
to be downloaded in advance from online environment.
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docs/offline-environment.md
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# Offline environment
In case your servers don't have access to internet (for example when deploying on premises with security constraints), you need to setup:
In case your servers don't have access to the internet directly (for example
when deploying on premises with security constraints), you need to get the
following artifacts in advance from another environment where has access to the internet.
* Some static files (zips and binaries)
* OS packages (rpm/deb files)
* Container images used by Kubespray. Exhaustive list depends on your setup
* [Optional] Python packages used by Kubespray (only required if your OS doesn't provide all python packages/versions listed in `requirements.txt`)
* [Optional] Helm chart files (only required if `helm_enabled=true`)
Then you need to setup the following services on your offline environment:
* a HTTP reverse proxy/cache/mirror to serve some static files (zips and binaries)
* an internal Yum/Deb repository for OS packages
* an internal container image registry that need to be populated with all container images used by Kubespray. Exhaustive list depends on your setup
* [Optional] an internal PyPi server for kubespray python packages (only required if your OS doesn't provide all python packages/versions listed in `requirements.txt`)
* [Optional] an internal Helm registry (only required if `helm_enabled=true`)
* an internal container image registry that need to be populated with all container images used by Kubespray
* [Optional] an internal PyPi server for python packages used by Kubespray
* [Optional] an internal Helm registry for Helm chart files
You can get artifact lists with [generate_list.sh](contrib/offline/generate_list.sh) script.
In addition, you can find some tools for offline deployment under [contrib/offline](contrib/offline/README.md).
## Configure Inventory