[libvirt] Authoritative source for logging filters descriptions ?
Heya, So I usually use these two resources, when tracing/debugging: - https://www.berrange.com/posts/2011/10/03/troubleshooting-libvirt-with-the-k... - http://libvirt.org/logging.html For instance, for filters to know what QMP commands libvirt is sending to QEMU: I use: - log_filters="1:qemu_monitor" - log_outputs="1:file:/var/log/libvirt/libvirtd.log" But, from https://www.berrange.com/posts/2011/10/03/troubleshooting-libvirt-with-the-k... I notice, we could also use these variations of filters QEMU/QMP filters: # QEMU JSON/QMP monitor commands - log_filters="1:qemu_monitor_json" # QEMU text monitor commands - log_filters="1:qemu_monitor_text" Is there any place where these are comprehensively documented, has anything changed from what's mentioned in the above blog & the logging wiki page ? Furthermore, from /etc/libvirt/libvirtd.conf, I see: =========================================== [...] # Logging filters: # A filter allows to select a different logging level for a given category # of logs # The format for a filter is one of: # x:name # x:+name # where name is a string which is matched against source file name, # e.g., "remote", "qemu", or "util/json", the optional "+" prefix # tells libvirt to log stack trace for each message matching name, # and x is the minimal level where matching messages should be logged: # 1: DEBUG # 2: INFO # 3: WARNING # 4: ERROR # # Multiple filter can be defined in a single @filters, they just need to be # separated by spaces. # # e.g. to only get warning or errors from the remote layer and only errors # from the event layer: #log_filters="3:remote 4:event" [...] =========================================== Is the above list of strings describe all possible "name" values for filters ? If I'm missing some obvious resource on the inter-webs, please point me to it. Thanks. -- /kashyap
On Tue, Jun 04, 2013 at 05:15:26PM +0530, Kashyap Chamarthy wrote:
Heya,
So I usually use these two resources, when tracing/debugging:
- https://www.berrange.com/posts/2011/10/03/troubleshooting-libvirt-with-the-k... - http://libvirt.org/logging.html
For instance, for filters to know what QMP commands libvirt is sending to QEMU:
I use: - log_filters="1:qemu_monitor" - log_outputs="1:file:/var/log/libvirt/libvirtd.log"
But, from https://www.berrange.com/posts/2011/10/03/troubleshooting-libvirt-with-the-k...
I notice, we could also use these variations of filters QEMU/QMP filters:
# QEMU JSON/QMP monitor commands - log_filters="1:qemu_monitor_json"
# QEMU text monitor commands - log_filters="1:qemu_monitor_text"
Is there any place where these are comprehensively documented, has anything changed from what's mentioned in the above blog & the logging wiki page ?
Furthermore, from /etc/libvirt/libvirtd.conf, I see: =========================================== [...] # Logging filters: # A filter allows to select a different logging level for a given category # of logs # The format for a filter is one of: # x:name # x:+name # where name is a string which is matched against source file name, # e.g., "remote", "qemu", or "util/json", the optional "+" prefix # tells libvirt to log stack trace for each message matching name, # and x is the minimal level where matching messages should be logged: # 1: DEBUG # 2: INFO # 3: WARNING # 4: ERROR # # Multiple filter can be defined in a single @filters, they just need to be # separated by spaces. # # e.g. to only get warning or errors from the remote layer and only errors # from the event layer: #log_filters="3:remote 4:event" [...] ===========================================
Is the above list of strings describe all possible "name" values for filters ?
The 'name' is just a sub-string match against source file names. So to get a list of valid filter names, just list all source file names. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
Furthermore, from /etc/libvirt/libvirtd.conf, I see: =========================================== [...] # Logging filters: # A filter allows to select a different logging level for a given category # of logs # The format for a filter is one of: # x:name # x:+name # where name is a string which is matched against source file name, # e.g., "remote", "qemu", or "util/json", the optional "+" prefix # tells libvirt to log stack trace for each message matching name, # and x is the minimal level where matching messages should be logged: # 1: DEBUG # 2: INFO # 3: WARNING # 4: ERROR # # Multiple filter can be defined in a single @filters, they just need to be # separated by spaces. # # e.g. to only get warning or errors from the remote layer and only errors # from the event layer: #log_filters="3:remote 4:event" [...] ===========================================
Is the above list of strings describe all possible "name" values for filters ?
The 'name' is just a sub-string match against source file names. So to get a list of valid filter names, just list all source file names.
Thanks. I should've read more carefully.
Daniel
-- /kashyap
participants (2)
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Daniel P. Berrange -
Kashyap Chamarthy