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# Best Practice -- Connecting Hawk to the world
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Hawk is surrounded by a strict outgoing firewall. Users can not open arbitrary connections to hosts on the internet. Connections can only be established through a proxy host. This document describes how to set up a proxy, and how to use this proxy in a number of common use cases.
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Hawk is surrounded by a strict outgoing firewall. Users can not open arbitrary connections to hosts on the internet. Connections can only be established through a proxy host. This document describes how to set up a proxy, and how to use this proxy in a number of common use cases.
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Common use cases include:
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- working on remote repositories with git
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- installing Python packages from PyPi, etc
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- access to package registries for languages such as Golang, Rust, etc.
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- access to package registries for languages such as Golang, Rust, etc.
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When following this guide, you will have to execute actions or command on Hawk, but also on your local workstation or laptop. For clarity, examples below will use prompts `local>` and `hawk>`, respectively.
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Tunnels are associated to _ports_. In the following, you will have to specify a port which is referred by the environment variable `$MY_PROXY_PORT`. You may choose the port numbers freely in the suggested range 10000 to 60000. It may happen, that a port is currently used by another user ... just choose a different one.
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Ok, let's do it.
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Ok, let's do it.
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The following will open a regular ssh connection to Hawk. In addition, the argument `-D $MY_PROXY_PORT` will establish a reverse dynamic port forwarding tunnel which opens at port `$MY_PROXY_PORT` on the Hawk side and connects to a SOCKS5 proxy on your local side.
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```bash
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Most applications which support https or http protocols can use proxies. Most of them will take the proxy from the environment variables `$https_proxy` and `$http_proxy`. Sometimes, you will have to specify the proxy through command line arguments.
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Example usage:
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Example usage:
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```bash
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# set up proxy with ssh and continue in the terminal which just opened
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hawk> MY_PROXY_PORT=XXXX # choose same port as above
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Most of the other use cases will build on the usage of these environment variables. Therefore we recommend to set them in you `.bashrc`. ==**TODO: do we recommend this?**==
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## Installing Python packages with pip
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Requirements:
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Requirements:
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- set up a proxy with ssh as describe in [this section](#setting-up-a-proxy-with-ssh)
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- set https proxy variables as describe in [this section](#httpshttp-proxy-variables)
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hawk> python3 -m pip install /sw/general/x86_64/development/python/share/PySocks-1.7.1-py3-none-any.whl
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```
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## Using proxy with git
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Git essentially supports two [protocols](https://git-scm.com/book/en/v2/Git-on-the-Server-The-Protocols) for communication with remote repositories:
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- HTTP protocol
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- SSH protocol
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Both protocols can routed through a SOCKS5 proxy.
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Both protocols can routed through a SOCKS5 proxy.
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==**TODO: do we recommend one over the other?**==
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### Git with ssh protocol
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Requirements:
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Requirements:
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- set up a proxy with ssh as describe in [this section](#setting-up-a-proxy-with-ssh)
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The other protocol for accessing remote git repositories uses ssh. Repository URLs for this protocol in general look like
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```bash
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[user@]server:[somepath/]project.git
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```
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On github.com for instance, it is
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On github.com, for instance, it is
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```bash
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git@github.com:user/project.git
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```
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