Support Forums : DataStax

DataStax Support Forums » OpsCenter

Error launching OpsCenter-free

(7 posts) (2 voices)

Started 1 year ago by kam
Latest reply from kam
This topic is resolved

Tags:

No tags yet.

kam
Member

I'm having some issues getting opscenter (free) to start; this is a new install.

My cluster in on EC2; the first monitoring box I tried the install on was an Amazon-built AMI (ami-8c1fece5, 2.6.35.11-83.9.amzn1.i686).
I noticed on the rpm install that I get the error
cp: cannot stat/var/lib/opscenter/ssl/agentKeyStore': No such file or directory`
and if I create it, that becomes
cp: omitting directory/var/lib/opscenter/ssl/agentKeyStore'`
This was last week with version 1.2.1, log as follows:

2011-08-05 14:36:55-0400 [-] Log opened.
2011-08-05 14:36:55-0400 [-] twistd 10.2.0 (/usr/bin/python2.6 2.6.7) starting up.
2011-08-05 14:36:55-0400 [-] reactor class: twisted.internet.selectreactor.SelectReactor.
2011-08-05 14:36:55-0400 [-] set uid/gid 219/497
2011-08-05 14:36:55-0400 [-] Logging level set to 'trace'
2011-08-05 14:36:55-0400 [-] OpsCenterdService startService
2011-08-05 14:36:55-0400 [-] OpsCenter version: 1.2.1
2011-08-05 14:36:55-0400 [-] Compatible agent version: 2.1
2011-08-05 14:36:55-0400 [-] HTTP BASIC authentication enabled
2011-08-05 14:36:55-0400 [-] Unhandled error in Deferred:
2011-08-05 14:36:55-0400 [-] Unhandled Error
	Traceback (most recent call last):
	  File "/usr/lib/python2.6/site-packages/twisted/scripts/_twistd_unix.py", line 317, in startApplication
	    app.startApplication(application, not self.config['no_save'])
	  File "/usr/lib/python2.6/site-packages/twisted/application/app.py", line 653, in startApplication
	    service.IService(application).startService()
	  File "/usr/lib/python2.6/site-packages/twisted/application/service.py", line 277, in startService
	    service.startService()
	  File "/usr/lib/python2.6/site-packages/twisted/internet/defer.py", line 1141, in unwindGenerator
	    return _inlineCallbacks(None, f(*args, **kwargs), Deferred())
	--- <exception caught here> ---
	  File "/usr/lib/python2.6/site-packages/twisted/internet/defer.py", line 1020, in _inlineCallbacks
	    result = g.send(result)
	  File "/usr/lib/python2.6/site-packages/opscenterd/OpsCenterdService.py", line 195, in startService

	  File "/usr/lib/python2.6/site-packages/opscenterd/OpsCenterdService.py", line 54, in setup

	  File "/usr/lib/python2.6/site-packages/opscenterd/OpsCenterdService.py", line 177, in SetupAgentService

	OpenSSL.SSL.Error: [('system library', 'fopen', 'No such file or directory'), ('BIO routines', 'BIO_new_file', 'no such file'), ('x509 certificate routines', 'X509_load_cert_crl_file', 'system lib')]

I noticed there was a new version today, but retrying the install gives much the same error on startup:

2011-08-10 19:02:24-0400 []  INFO: Log opened.
2011-08-10 19:02:24-0400 []  INFO: twistd 10.2.0 (/usr/bin/python2.6 2.6.7) starting up.
2011-08-10 19:02:24-0400 []  INFO: reactor class: twisted.internet.selectreactor.SelectReactor.
2011-08-10 19:02:24-0400 []  INFO: set uid/gid 219/497
2011-08-10 19:02:24-0400 []  INFO: Logging level set to 'trace'
2011-08-10 19:02:24-0400 []  INFO: OpsCenterdService startService
2011-08-10 19:02:24-0400 []  INFO: OpsCenter version: 1.2.2
2011-08-10 19:02:24-0400 []  INFO: Compatible agent version: 2.2
2011-08-10 19:02:24-0400 [] DEBUG: Logging user config options:
2011-08-10 19:02:24-0400 [] DEBUG: jmx : [('port', '7199')], logging : [('level', 'TRACE')], webserver : [('interface', '107.xx.xx.xxx'), ('port', '8888')], authentication : [], cassandra_metrics : [], cassandra : [('api_port', '9160'), ('seed_hosts', '10.xx.xxx.xxx')],
2011-08-10 19:02:24-0400 []  INFO: HTTP BASIC authentication enabled
2011-08-10 19:02:24-0400 []  INFO: Unhandled error in Deferred:
2011-08-10 19:02:24-0400 []  INFO:

Trying on another box (one of the cassandra nodes) results in an identical error.
That box looks like this:

$ cat /etc/redhat-release
CentOS release 5.6 (Final)
$ java -version
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)
$ nodetool -h localhost version
ReleaseVersion: 0.8.3

Any recommendations? I'm assuming since it happens on two very different boxes it's something I'm doing, but I don't see any pointers in the docs.

Thanks!

Posted 1 year ago #

nickmbailey
Key Master

There is likely more error output earlier in the install process. Both cp and the log are complaining the ssl files used for agent communication do not exist. These are created on install and should produce error output if that creation fails.

Posted 1 year ago #

kam
Member

Here's the full text of the clean install..

Total download size: 40 M
Is this ok [y/N]: y
Downloading Packages:
opscenter-free-1.2.2-1.noarch.rpm                                                                                                                                                                                                                                                                                         |  40 MB     00:04
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : opscenter-free                                                                                                                                                                                                                                                                                                            1/1
Generating a 1024 bit RSA private key
...............++++++
.......++++++
writing new private key to '/var/lib/opscenter/ssl/opscenter.key'
-----
cp: cannot stat

/var/lib/opscenter/ssl/agentKeyStore': No such file or directory

Installed:
opscenter-free.noarch 0:1.2.2-1

Complete!`

(Relaunching promptly lead to the same error as before)

I'm not finding any other interesting info logged elsewhere, suggestions?

I went to remove/reinstall the package from the original monitoring box I had tried on, and got this error...

Error in PREUN scriptlet in rpm package opscenter-free
opscenter-free-1.2.2-1.noarch was supposed to be removed but is not!

Thanks -

Posted 1 year ago #

nickmbailey
Key Master

You actually found a bug with the free package. The ssl files were prevented from ever being created. The bug has been fixed and a new package uploaded. You will want to make sure you delete any files you manually created.

If you are still having problems removing the package you can do 'rpm -e opscenter-free --nopreun' to skip the pre-uninstall step.

Thanks for reporting the problem!

Posted 1 year ago #
kam
Member
Thanks, that did help... with the new install I do have those extra files.

I was still having this undefined error in the log
```
2011-08-11 12:30:10-0400 []  INFO: agent_config items: {'metrics_enabled': 1, 'metrics_ignored_column_families': '', 'metrics_ignored_keyspaces': 'system, OpsCenter', 'jmx_port': 7199}
2011-08-11 12:30:10-0400 []  INFO: Unhandled error in Deferred:
2011-08-11 12:30:10-0400 []  INFO:
```
...but I found that if I defined the webserver interface to the loopback or internal interfaces (again, I'm on EC2), it would start fine.
```
2011-08-11 13:53:48-0400 []  INFO: agent_config items: {'metrics_enabled': 1, 'metrics_ignored_column_families': '', 'metrics_ignored_keyspaces': 'system, OpsCenter', 'jmx_port': 7199}
2011-08-11 13:53:48-0400 []  INFO: opscenterd.WebServer.OpsCenterdWebServer starting on 8888
2011-08-11 13:53:48-0400 []  INFO: Starting factory <opscenterd.WebServer.OpsCenterdWebServer instance at 0x907418c>
```
Not too big a deal, I can tunnel in just fine, but it would be nice if it would attach to the external interface.

On to the next issue... I'm not seeing any way to configure opscenter with the cassandra cluster user name/pwd. Is this supported? I'm assuming this is what is causing the
No candidate nodes to expand pool... errors in the opscenter log. I went ahead and manually installed the opscenter agent on one of the nodes, which was able to connect... but that doesn't seem to be sufficient.

Thanks again-
Posted 1 year ago #
nickmbailey
Key Master

You can bind to '0.0.0.0' if you want to view the UI without tunneling.

If you add the following to your opscenterd.conf file it should use cassandra authentication.

username = $USER
password = $PASS

EDIT: You need to add the above conf under the '[cassandra]' section.

Posted 1 year ago #
kam
Member

Thanks, both of those tips did the trick.

Posted 1 year ago #

RSS feed for this topic

Reply

You must log in to post.