im setting up a master node on a virtual machine on my pc. is it possible? using ubuntu 16.04*server
because im getting a lot of problems.

setting this :
USERNAME=$(pwgen -s 16 1)
PASSWORD=$(pwgen -s 64 1)
cat << EOF > ~/.monoeciCore/monoeci.conf
rpcuser=$USERNAME
rpcpassword=$PASSWORD
rpcallowip=127.0.0.1
server=1
listen=1
daemon=1
maxconnections=24
masternode=1
masternodeprivkey=PRIV KEY HERE
externalip=IP DU SERVEUR VPS
EOF

than monoecid
it give me error/invalid about "cat"

removing cat i got full sync , i put sentinel and it sems to work, the last problem is setting masternode.conf (alias IP:port masternodeprivkey collateral_output_txid collateral_output_index) modified to merge my config, the wallet return me always error about error reading masternod config file.
Im i doing something wrong or is because masternode and wallet got same ip because im in nat with the vm? plz help