make-cadir ./ca 
cd ca
ln -s openssl-1.0.0.cnf openssl.cnf
nano vars #-> edit key default values
source ./vars
./clean-all

./build-ca
./build-key-server <common-name>

scp ./keys/{ca.crt,<common-name>.crt,<common-name>.key} root@ip:/etc/openvpn/server
scp root@ip:/etc/openvpn/server/ta.key ./keys

cd ca && source ./vars && ./build-key client1
./build-key client1