ceilometer meter-list Error communicating with http://192.168.56.101:8777 [Errno 111] Connection refused

Fix
====
Check "ceilometer-api" log and make sure that "ceilometer-api" is running

Error
======
saju@ubuntu:~/openstack$ ceilometer meter-list
Error communicating with http://192.168.56.101:8777 [Errno 111] Connection refused
saju@ubuntu:~/openstack$
saju@ubuntu:~/openstack$
saju@ubuntu:~/openstack$ . devstack/openrc
saju@ubuntu:~/openstack$
saju@ubuntu:~/openstack$
saju@ubuntu:~/openstack$
saju@ubuntu:~/openstack$
saju@ubuntu:~/openstack$ ceilometer meter-list
Error communicating with http://192.168.56.101:8777 [Errno 111] Connection refused
saju@ubuntu:~/openstack$
saju@ubuntu:~/openstack$
saju@ubuntu:~/openstack$ ceilometer alarm-list
Error communicating with http://192.168.56.101:8777 [Errno 111] Connection refused
saju@ubuntu:~/openstack$