Opscenter on Cassandra

This is JUST a draft: I will document all details later...

Installing Cassandra on CentOS:

link: http://www.datastax.com/docs/1.1/install/install_rpm

Locations of Configuration Files:

link: http://www.datastax.com/docs/1.1/references/install_locations#install-locations

Installing Opscenter on CentOS:
link: http://www.datastax.com/docs/opscenter/install/install_rhel
Advanced Configuration for Opscenter:
link: http://www.datastax.com/docs/opscenter/configure/configure_opscenter_adv

4 important configuration files:
 cassandra(version 1.1.6):
1. cassandra.yaml
2. cassandra-topology.porperties
opscenter(version 2.1.2):
1. opscenterd.conf
2. /etc/opscenter/clusters/Default.conf   [ this is the most important part for opscenter, if you do not have  ]

important things to remember:
I leave the broadcast_address and rpc_address to blank, and set the listen_address to the local machine's internal ip address. it works fine.

it always say no agent connected:
solution:
we should disable ssl both on opscenter and opscenter-agent

opscenter cannot connect with cassandra:

1.we should not mix the installation, which means we cannot install both the tar.gz and rpm at the same time, it will always get bad results.
2. rpc_address must not be localhost.  it should be the numbers
3. cluster_name "Test Cluster", when we change it to "Starscriber Cluster", cassandra will not work
4. at the beginning, we set the listen_address to be the internal ip and set broadcast_address to external ip address.and it did not work.

5.opscenter only need to be installed on one of the cassandra nodes.

6. commitlog  should have a separate disk.  once you defined this disk you should partition this disk and then format it, and then mount it and change it in the /etc/fstab file(it will mount it every time the system starts)

7. initial_token???

8. we have 6 cassandra nodes. DC1 has 2, DC2 2 and DC3 2.  for our seeds, we only put one ip of each DC into the seeds list.(seeds list for cassandra.yaml, for opscenter /etc/opscenter/clusters/cluster.conf)

9. cassandra owner don't forget this part!!!