I have just setup a four nodes Cassandra 3.4 cluster running centOS 7 on AWS. I was able to configure it and get all the nodes together. Now I would like to perform some tests, monitoring the cluster behavior using the devops center which I installed on one machine.
I thought using ssh-tunneling to access it from my computer:
ssh -i Amazon-EC2-Ami.pem -L 9999:localhost:8888 centos@public_address
Using my browser, localhost:9999 gets correctly tunneled to the devops login page: http://localhost:8888/opscenter/login.html, but I got a ERR_CONNECTION_REFUSED
I tried accessing devops on that machine using a command line browser and it displays the login page. I really do not know what the issue could be. Any information is truly appreciated. This is the cassandra-yaml configuration file, in case it helps:
cluster_name: 'Cloak'
listen_address:
endpoint_snitch: GossipingPropertyFileSnitch
rpc_address:
seed_provider:
- class_name: org.apache.cassandra.locator.SimpleSeedProvider
parameters:
- seeds: "172.31.55.186,172.31.55.187"
EDIT Using the -v option launching the ssh tunneling I can confirm that the requests are correctly tunneled:
[centos@ip-172-31-55-186 ~]$ debug1: Connection to port 9999
forwarding to localhost port 8888 requested.
debug1: channel 3: new [direct-tcpip]
debug1: Connection to port 9999 forwarding to localhost port 8888
requested.
debug1: channel 4: new [direct-tcpip]
debug1: channel 3: free: direct-tcpip: listening port 9999 for
localhost port 8888, connect from 127.0.0.1 port 43846 to 127.0.0.1
port 9999, nchannels 5
Finally I managed to access it from my computer. I had to modify the configuration file for the operation center, located in /etc/opscenter/opscenterd.conf (only for package installation):
[webserver]
port = 8888
interface = 127.0.0.1
By default the webserver accepts requests only from the localhost. Probably it won't be the best option, but since the operation center allows to configure users, I set interface = 0.0.0.0, allowing any host to contact it.