mkdir /etc/ssl cd /etc/ssl/ mkdir CA cd CA mkdir certs crl newcerts private echo "01" > serial cp /dev/null index.txt cp /usr/local/openssl/openssl.cnf.sample openssl.cnf openssl req -new -x509 -keyout private/cakey.pem -out \ cacert.pem -days 365 -config openssl.cnf To make a new certificate: openssl req -nodes -new -x509 -keyout newreq.pem \ -out newreq.pem -days 365 -config openssl.cnf (certificate and private key in file newreq.pem) To sign new certificate with certificate authority: openssl x509 -x509toreq -in newreq.pem -signkey newreq.pem \ -out tmp.pem openssl ca -config openssl.cnf -policy policy_anything \ -out newcert.pem -infiles tmp.pem rm -f tmp.pem (newcert.pem contains signed certificate, newreq.pem still contains unsigned certificate and private key) For More info , plz refer here