4.3 KiB
Troubleshoot Telemetry
Logging in Telemetry
The Telemetry service has similar log settings as the other OpenStack services. Multiple options are available to change the target of logging, the format of the log entries and the log levels.
The log settings can be changed in ceilometer.conf. The
list of configuration options are listed in the logging configuration
options table in the Telemetry
section in the OpenStack Configuration Reference.
By default stderr is used as standard output for the log
messages. It can be changed to either a log file or syslog. The
debug and verbose options are also set to
false in the default settings, the default log levels of the
corresponding modules can be found in the table referred above.
Recommended order of starting services
As it can be seen in Bug 1355809, the wrong ordering of service startup can result in data loss.
When the services are started for the first time or in line with the
message queue service restart, it takes time while the
ceilometer-collector service establishes the connection and
joins or rejoins to the configured exchanges. Therefore, if the
ceilometer-agent-compute,
ceilometer-agent-central, and the
ceilometer-agent-notification services are started before
the ceilometer-collector service, the
ceilometer-collector service may lose some messages while
connecting to the message queue service.
The possibility of this issue to happen is higher, when the polling
interval is set to a relatively short period. In order to avoid this
situation, the recommended order of service startup is to start or
restart the ceilometer-collector service after the message
queue. All the other Telemetry services should be started or restarted
after and the ceilometer-agent-compute should be the last
in the sequence, as this component emits metering messages in order to
send the samples to the collector.
Notification agent
In the Icehouse release of OpenStack a new service was introduced to be responsible for consuming notifications that are coming from other OpenStack services.
If the ceilometer-agent-notification service is not
installed and started, samples originating from notifications will not
be generated. In case of the lack of notification based samples, the
state of this service and the log file of Telemetry should be checked
first.
For the list of meters that are originated from notifications, see the Telemetry Measurements Reference.
Recommended auth_url to be used
When using the Telemetry command-line client, the credentials and the
os_auth_url have to be set in order for the client to
authenticate against OpenStack Identity. For further details about the
credentials that have to be provided see the Telemetry
Python API.
The service catalog provided by OpenStack Identity contains the URLs
that are available for authentication. The URLs have different
ports, based on whether the type of the given URL is
public, internal or admin.
OpenStack Identity is about to change API version from v2 to v3. The
adminURL endpoint (which is available via the port:
35357) supports only the v3 version, while the other two
supports both.
The Telemetry command line client is not adapted to the v3 version of
the OpenStack Identity API. If the adminURL is used as
os_auth_url, the ceilometer command results in the following error
message:
$ ceilometer meter-list
Unable to determine the Keystone version to authenticate with \
using the given auth_url: http://10.0.2.15:35357/v2.0Therefore when specifying the os_auth_url parameter on
the command line or by using environment variable, use the
internalURL or publicURL.
For more details check the bug report Bug 1351841.