The log filters have supported the use of a "+" before the source match
string to request that a stack trace be emitted for every log message:
commit 548563956e
Author: Daniel P. Berrange <berrange@redhat.com>
Date: Wed May 9 15:18:56 2012 +0100
Allow stack traces to be included with log messages
Sometimes it is useful to see the callpath for log messages.
This change enhances the log filter syntax so that stack traces
can be show by setting '1:+NAME' instead of '1:NAME'.
With the huge & ever increasing number of logging statements per file,
this will be incredibly verbose and have a major performance penalty.
This makes the feature impractical to use widely and as such it is not
worth the code maint cost.
Removing this seldom used feature allows us to drop the 'execinfo'
module in gnulib which provides the backtrace() function which doesn't
exist on non-Linux.
Users who want to get stack traces of parts of libvirt can use GDB,
or systemtap for live tracing with minimal perf impact.
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The virtlogd config is set to rollover logs every 2 MB.
Normally a logrotate config file is also installed to handle cases where
virtlogd is disabled. This is set to rollover weekly with no size
constraint.
As a result logrotate can interfere with virtlogd's, rolling over files
that virtlogd has already taken care of.
This changes logrotate configs to rollover based on a max size
constraint of 2 MB + 1 byte. When virtlogd is running the log files will
never get this large, making logrotate a no-op.
If the user changes the size in virtlogd's config to something larger,
they are responsible for also changing the logrotate config suitably.
The LXC/libxl drivers don't use virtlogd, but there logrotate config is
altered to match the QEMU driver config, for the sake of consistency.
Reviewed-by: Jim Fehlig <jfehlig@suse.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Strongly recommend against use of the log_levels setting since it
creates overly verbose logs and has a serious performance impact.
Describe the log filter syntax better and mention use of shell
glob syntax. Also provide more realistic example of good settings
to use. The libvirtd example is biased towards QEMU, but when the
drivers split off each daemon can get its own more appropriate
example.
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Most of the augeas test files use ::CONFIG:: to pull in the master
config file for testing. This ensures that entries added to the config
file are actually tested by augeas.
This identified the missing admin_max_clients example in the virtlogd
config file, which in turn prompted a change in description of the
max_clients parameter, since these daemons don't have separate
readonly & readwrite sockets.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
People debugging guest OS boot processes and reported that
the default 128 KB size is too small to capture an entire
boot up sequence. Increase the default size to 2 MB which
should allow capturing a full boot up even with verbose
debugging.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Currently virtlogd has a hardcoded max file size of 128kb
and max of 3 backups. This adds two new config parameters
to /etc/libvirt/virtlogd.conf to let these be customized.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Copy the virtlockd codebase across to form the initial virlogd
code. Simple search & replace of s/lock/log/ and gut the remote
protocol & dispatcher. This gives us a daemon that starts up
and listens for connections, but does nothing with them.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
