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A earlier commit changed the global log buffer so that it only
records messages that are explicitly requested via the log
filters setting. This removes the performance burden, and
improves the signal/noise ratio for messages in the global
buffer. At the same time though, it is somewhat pointless, since
all the recorded log messages are already going to be sent to an
explicit log output like syslog, stderr or the journal. The
global log buffer is thus just duplicating this data on stderr
upon crash.
The log_buffer_size config parameter is left in the augeas
lens to prevent breakage for users on upgrade. It is however
completely ignored hereafter.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
When probing QEMU capabilities fails for a binary generate a
log message with MESSAGE_ID==8ae2f3fb-2dbe-498e-8fbd-012d40afa361.
This can be directly queried from journald based on the UUID
instead of needing string grep. This lets tools like libguestfs'
bug reporting tool trivially do automated sanity tests on the
host they're running on.
$ journalctl MESSAGE_ID=8ae2f3fb-2dbe-498e-8fbd-012d40afa361
Feb 21 17:11:01 localhost.localdomain lt-libvirtd[9196]:
Failed to probe capabilities for /bin/qemu-system-alpha:
internal error: Child process (LC_ALL=C LD_LIBRARY_PATH=
/home/berrange/src/virt/libvirt/src/.libs PATH=/usr/lib64/
ccache:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:
/usr/bin:/root/bin HOME=/root USER=root LOGNAME=root
/bin/qemu-system-alpha -help) unexpected exit status 127:
/bin/qemu-system-alpha: error while loading shared libraries:
libglapi.so.0: cannot open shared object file: No such file
or directory
$ journalctl MESSAGE_ID=8ae2f3fb-2dbe-498e-8fbd-012d40afa361 --output=json
{ ...snip...
"LIBVIRT_SOURCE" : "file",
"PRIORITY" : "3",
"CODE_FILE" : "qemu/qemu_capabilities.c",
"CODE_LINE" : "2770",
"CODE_FUNC" : "virQEMUCapsLogProbeFailure",
"MESSAGE_ID" : "8ae2f3fb-2dbe-498e-8fbd-012d40afa361",
"LIBVIRT_QEMU_BINARY" : "/bin/qemu-system-xtensa",
"MESSAGE" : "Failed to probe capabilities for /bin/qemu-system-xtensa:
internal error: Child process (LC_ALL=C LD_LIBRARY_PATH=/home/berrange
/src/virt/libvirt/src/.libs PATH=/usr/lib64/ccache:/usr/local/sbin:
/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin HOME=/root
USER=root LOGNAME=root /bin/qemu-system-xtensa -help) unexpected
exit status 127: /bin/qemu-system-xtensa: error while loading shared
libraries: libglapi.so.0: cannot open shared object file: No such
file or directory\n" }
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
When a virError is raised, pass the error domain and code
onto the systemd journald using metadata fields.
This allows error messages to be queried by code eg
$ journalctl LIBVIRT_CODE=43
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The logging doc had a hand-written table of contents
instead of using the automatic XSL generated one.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The rule generating the HTML docs passing the --html flag
to xsltproc. This makes it use the legacy HTML parser, which
either ignores or tries to fix all sorts of broken XML tags.
There's no reason why we should be writing broken XML in
the first place, so removing --html and adding the XHTML
doctype to all files forces us to create good XML.
This adds the XHTML doc type and fixes many, many XML tag
problems it exposes.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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'.
This results in output like:
2012-05-09 14:18:45.136+0000: 13314: debug : virInitialize:414 : register drivers
/home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virInitialize+0xd6)[0x7f89188ebe86]
/home/berrange/src/virt/libvirt/tools/.libs/lt-virsh[0x431921]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x3a21e21735]
/home/berrange/src/virt/libvirt/tools/.libs/lt-virsh[0x40a279]
2012-05-09 14:18:45.136+0000: 13314: debug : virRegisterDriver:775 : driver=0x7f8918d02760 name=Test
/home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virRegisterDriver+0x6b)[0x7f89188ec717]
/home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(+0x11b3ad)[0x7f891891e3ad]
/home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virInitialize+0xf3)[0x7f89188ebea3]
/home/berrange/src/virt/libvirt/tools/.libs/lt-virsh[0x431921]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x3a21e21735]
/home/berrange/src/virt/libvirt/tools/.libs/lt-virsh[0x40a279]
* docs/logging.html.in: Document new syntax
* configure.ac: Check for execinfo.h
* src/util/logging.c, src/util/logging.h: Add support for
stack traces
* tests/testutils.c: Adapt to API change
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
* docs/logging.html.in: document the fact that starting from
0.9.0 the server logs goes to libvirtd.log instead of syslog
by default, describe the debug buffer, restructure the page
and add a couple more examples
* docs/logging.html[.in] qemud/libvirtd.conf qemud/qemud.c
src/logging.[ch]: cleanup the logging code and docs to remove
all references to log level 0, cleanup hardcoded values and add
a default VIR_LOG_DEFAULT value, patch by Amy Griffis
daniel
the logging system
* docs/auth.html docs/deployment.html docs/remote.html
docs/sitemap.html docs/sitemap.html.in docs/uri.html
docs/windows.html: integration in the existing set
Daniel
