opscenter build cluster failing on EC2

Question

I'm trying to build a new Cassandra cluster on Amazon EC2 using Opscenter for development use.

I have installed Opscenter (v4.1.3) on an EC2 instance using the instructions on http://www.datastax.com/documentation/opscenter/4.1/opsc/install/opscInstallRHEL_t.html, and followed the instructions in http://www.datastax.com/documentation/opscenter/4.1/opsc/online_help/opscCreatingCluster_t.html to build a two-node cluster. The node is not directly accessible from the public internet; I have configured an httpd rule on our NAT box to forward traffic to the opscenter install.

However, when I hit "Build Cluster" I get an error pop-up saying "Error checking provisioning requests: Unable to load /opscenter/request/[object Object]/status status: 404"

Wireshark shows that my laptop is indeed doing a get for "/opscenter/request/[object%20Object]/status" and "[object Object]" looks to me like some Javascript should be inserting the contents of an object, so I believe this is a fault in the Javascript.

I've had a scan through the source as served by Opscenter, but it is all minified. I shall have a look through the source tarball tomorrow.

Any help gratefully received at this point.

Answer 1

It seems the problem was in forwarding traffic through our NAT box. My forwarding rules were rather naive and there is clearly some traffic not being forwarded.

I created a new CentOS 6 EC2 instance with direct visibility from the internet, and set up the security groups and iptables to allow access to port 8888. Opscenter now gets much further.

I did try running opscenter on our NAT box, however I got Python errors. I believe this was due to the NAT box not running a Linux flavour supported by Opscenter.