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Add solution to make persistent rules in /etc/hosts

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Add solution to make persistent rules in /etc/hosts. 
I checked that it works, but I hope the approach will be checked before approval for being qubes-way and clean enough.
If it's not, different solution should be provided to modify /etc/hosts permanently for TemplateBasedVMs, because, it seems, there is no one in the documentation.
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jamke 2019-02-10 12:01:14 +07:00 committed by GitHub
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customization/bind-dirs.md
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@ -73,7 +73,16 @@ If you want to circumvent this process, you can create the relevant filestructur
* Running `sudo /usr/lib/qubes/bind-dirs.sh umount` after boot (before shutdown) is probably not sane and nothing can be done about that.
* Many editors create a temporary file and copy it over the original file. If you have bind mounted an individual file this will break the mount.
Any changes you make will not survive a reboot. If you think it likely you will want to edit a file, then either include the parent directory in bind-dirs.rather than the file, or perform the file operation on the file in /rw/bind-dirs.
* Some files are altered when a qube boots - e.g. /etc/hosts. If you try to use bind-dirs on such files you may break your qube in unpredictable ways.
* Some files are altered when a qube boots - e.g. `/etc/hosts`. If you try to use bind-dirs on such files you may break your qube in unpredictable ways.
You can add persistent rules to `/etc/hosts` file using script `/rw/config/rc.local` that is designed to override configuration in /etc, starting services and etc. For example, to make software inside some TemplateBasedVM resolving the domain `example.com` as `127.0.0.1` open `/rw/config/rc.local` inside this TemplateBasedVM and add:
~~~
echo '127.0.0.1 example.com' >> /etc/hosts
~~~
After every boot of the TemplateBasedVM `rc.local` script will add line `127.0.0.1 example.com` to `/etc/hosts` file and the software inside the TemplateBasedVM will resolve domain `example.com` accordingly. You cam add several rules to `/etc/hosts` the same way.
## How to remove binds from bind-dirs.sh? ##