How to install redis on Linux:
Ubuntu:
apt-get install redis-server
For more details on other distros see http://redis.io/topics/quickstart
How to install Arma 3 Server on Linux
Use steamCMD https://developer.valvesoftware.com/wiki/SteamCMD#Linux
./steamcmd.sh +login STEAM_USERNAME STEAM_PASSWORD +force_install_dir /home/arma3
app_update 233780 validate
quit
Install the required packages:
sudo apt-get install g++-multilib
sudo apt-get install libstdc++6