In terminal I key in following

ubuntu@ip-111:/etc/bitcoin$ bitcoind -daemon
Bitcoin server starting
ubuntu@ip-111:/etc/bitcoin$ bitcoin-cli uptime
error: Could not locate RPC credentials. No authentication cookie could be found, and RPC password is not set.  See -rpcpassword and -stdinrpcpass.  Configuration file: (/home/ubuntu/.bitcoin/bitcoin.conf)

Then I check netstat -ltap but no bitcoind appear as one of PID listening to port.


Please guide me what has wrong.