OpenVPN configuration for /etc/openvpn/server.conf

server.conf

local 192.168.2.0 # SWAP THIS NUMBER WITH YOUR RASPBERRY PI IP ADDRESS
dev tun 
proto udp #Some people prefer to use tcp. Don't change it if you don't know.
port 1194 
ca /etc/openvpn/easy-rsa/keys/ca.crt 
cert /etc/openvpn/easy-rsa/keys/Server.crt # SWAP WITH YOUR CRT NAME
key /etc/openvpn/easy-rsa/keys/Server.key # SWAP WITH YOUR KEY NAME
dh /etc/openvpn/easy-rsa/keys/dh1024.pem # If you changed to 2048, change that here!
server 10.8.0.0 255.255.255.0 
# server and remote endpoints 
ifconfig 10.8.0.1 10.8.0.2 
# Add route to Client routing table for the OpenVPN Server 
push "route 10.8.0.1 255.255.255.255" 
# Add route to Client routing table for the OpenVPN Subnet 
push "route 10.8.0.0 255.255.255.0" 
# your local subnet 
push "route 192.168.2.0 255.255.255.0" # SWAP THE IP NUMBER WITH YOUR RASPBERRY PI IP ADDRESS
# Set primary domain name server address to the SOHO Router 
# If your router does not do DNS, you can use Google DNS 8.8.8.8 
push "dhcp-option DNS 192.168.2.1" # This should already match your router address and not need to be changed.
# Override the Client default gateway by using 0.0.0.0/1 and 
# 128.0.0.0/1 rather than 0.0.0.0/0. This has the benefit of 
# overriding but not wiping out the original default gateway. 
push "redirect-gateway def1" 
client-to-client 
duplicate-cn 
keepalive 10 120 
tls-auth /etc/openvpn/easy-rsa/keys/ta.key 0 
cipher AES-128-CBC 
comp-lzo 
user nobody 
group nogroup 
persist-key 
persist-tun 
status /var/log/openvpn-status.log 20 
log /var/log/openvpn.log 
verb 1

cert /etc/openvpn/easy-rsa/keys/Server.crt # SWAP WITH YOUR CRT NAME
key /etc/openvpn/easy-rsa/keys/Server.key # SWAP WITH YOUR KEY NAME

can someone explain what this means ? what is CRT and Key name or do i just leave it as so?

The following script in the repository enabled duplicate-cn by default. You don't want to change the config file.
https://github.com/gayankuruppu/openvpn-install-for-multiple-users