Can i have two servers Master server for my website and if this server is down or have any problem like network etc .. then slave server start working ?? i need this because DO have network problem in our server`s reg...

My servers down according to https://status.digitalocean.com (http://) , Can i make slave server if main server (Droplet) is down a slave server (Droplet) work ?

I have Only MySQL server run on ubuntu and when tried install unzip package This error shown Segmentation fault (core dumped) and when tried update sudo apt-get update Show Fetched 5395 kB in 10s (494 kB/s) ...