Is it possible to download any suitable os from network and install it same way like using pxe boot on pc?
Update: Reason for that is saving time when installin multiple Raspberries without need every time made a new sd-card if some program is changed etc.
I see mainly two possibilities for your needs. You can setup a debian repository. Then you only need an initial SD Card installation that can be updated with apt from your own repository. How to do it you may have a look at Debian Repository Setup.
You can setup a net booting infrastructure. This is more flexible than an repository because you can load complete different operating systems to the RasPi that may run from the network without a SD Card. Or you can run an installer program from the network that flashes an image to the SD Card and reboot to the SD Card. But net booting is limited to wired network connections. How to install a net boot infrastructure using Raspberry Pis you can look at Netbooting multiple “workers” RPi from a “master” RPi.
