Re: [libvirt] [PATCH 2/2] daemon: Limit default log level to journald to VIR_LOG_INFO
On 08/12/14 20:03, Daniel P. Berrange wrote: On Tue, Aug 12, 2014 at 04:34:37PM +0200, Peter Krempa wrote: Libvirt is really chatty when the DEBUG log level is enabled. When a host uses journald we'd enable debug logging to journald when only specifying the debug log level. As journald may employ rate throttling this would lock up the daemon until it's able to flush all debug messages. This patch changes the default log level to VIR_LOG_INFO when using the default (unconfigured) log output to journald. To still allow debug logging to journad the user now has to explicitly specify journald as a log output with priority 1 in the log_outputs configuration option. This patch also changes the config file template to be explicit about this change and notify the user about the possible consequence of debug logging into journald. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1121955 --- daemon/libvirtd.c| 10 +- daemon/libvirtd.conf | 4 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/daemon/libvirtd.c b/daemon/libvirtd.c index 946081a..2783c97 100644 --- a/daemon/libvirtd.c +++ b/daemon/libvirtd.c @@ -678,7 +678,15 @@ daemonSetupLogging(struct daemonConfig *config, (godaemon || !isatty(STDIN_FILENO))) { char *tmp; if (access(/run/systemd/journal/socket, W_OK) = 0) { -if (virAsprintf(tmp, %d:journald, virLogGetDefaultPriority()) 0) +virLogPriority priority = virLogGetDefaultPriority(); + +/* By default we don't want to log too much stuff into journald as + * it may employ rate limiting and thus blocking libvirt execution. + */ +if (priority == VIR_LOG_DEBUG) +priority = VIR_LOG_INFO; + +if (virAsprintf(tmp, %d:journald, priority) 0) goto error; virLogParseOutputs(tmp); VIR_FREE(tmp); ACK, matches what I suggested we do previously. I've fixed the typos/grammar pointed out by Eric and pushed this series. Regards, Daniel Peter signature.asc Description: OpenPGP digital signature -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
[libvirt] [PATCH 2/2] daemon: Limit default log level to journald to VIR_LOG_INFO
Libvirt is really chatty when the DEBUG log level is enabled. When a host uses journald we'd enable debug logging to journald when only specifying the debug log level. As journald may employ rate throttling this would lock up the daemon until it's able to flush all debug messages. This patch changes the default log level to VIR_LOG_INFO when using the default (unconfigured) log output to journald. To still allow debug logging to journad the user now has to explicitly specify journald as a log output with priority 1 in the log_outputs configuration option. This patch also changes the config file template to be explicit about this change and notify the user about the possible consequence of debug logging into journald. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1121955 --- daemon/libvirtd.c| 10 +- daemon/libvirtd.conf | 4 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/daemon/libvirtd.c b/daemon/libvirtd.c index 946081a..2783c97 100644 --- a/daemon/libvirtd.c +++ b/daemon/libvirtd.c @@ -678,7 +678,15 @@ daemonSetupLogging(struct daemonConfig *config, (godaemon || !isatty(STDIN_FILENO))) { char *tmp; if (access(/run/systemd/journal/socket, W_OK) = 0) { -if (virAsprintf(tmp, %d:journald, virLogGetDefaultPriority()) 0) +virLogPriority priority = virLogGetDefaultPriority(); + +/* By default we don't want to log too much stuff into journald as + * it may employ rate limiting and thus blocking libvirt execution. + */ +if (priority == VIR_LOG_DEBUG) +priority = VIR_LOG_INFO; + +if (virAsprintf(tmp, %d:journald, priority) 0) goto error; virLogParseOutputs(tmp); VIR_FREE(tmp); diff --git a/daemon/libvirtd.conf b/daemon/libvirtd.conf index c73423f..0560b69 100644 --- a/daemon/libvirtd.conf +++ b/daemon/libvirtd.conf @@ -309,6 +309,10 @@ # Logging level: 4 errors, 3 warnings, 2 information, 1 debug # basically 1 will log everything possible +# Note: Journald may employ rate limiting of the messages logged +# and thus lock up the libvirt daemon. To use the debug level with +# journald you have to specify it explicitly in 'log_outputs' otherwise +# only information level messages will be logged. #log_level = 3 # Logging filters: -- 2.0.2 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Re: [libvirt] [PATCH 2/2] daemon: Limit default log level to journald to VIR_LOG_INFO
On 08/12/2014 08:34 AM, Peter Krempa wrote: Libvirt is really chatty when the DEBUG log level is enabled. When a host uses journald we'd enable debug logging to journald when only specifying the debug log level. As journald may employ rate throttling this would lock up the daemon until it's able to flush all debug messages. This patch changes the default log level to VIR_LOG_INFO when using the default (unconfigured) log output to journald. To still allow debug logging to journad the user now has to explicitly s/journad/journald/ +/* By default we don't want to log too much stuff into journald as + * it may employ rate limiting and thus blocking libvirt execution. s/blocking/block/ +++ b/daemon/libvirtd.conf @@ -309,6 +309,10 @@ # Logging level: 4 errors, 3 warnings, 2 information, 1 debug # basically 1 will log everything possible +# Note: Journald may employ rate limiting of the messages logged +# and thus lock up the libvirt daemon. To use the debug level with +# journald you have to specify it explicitly in 'log_outputs' otherwise s/ otherwise/, otherwise/ -- Eric Blake eblake redhat com+1-919-301-3266 Libvirt virtualization library http://libvirt.org signature.asc Description: OpenPGP digital signature -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Re: [libvirt] [PATCH 2/2] daemon: Limit default log level to journald to VIR_LOG_INFO
On Tue, Aug 12, 2014 at 04:34:37PM +0200, Peter Krempa wrote: Libvirt is really chatty when the DEBUG log level is enabled. When a host uses journald we'd enable debug logging to journald when only specifying the debug log level. As journald may employ rate throttling this would lock up the daemon until it's able to flush all debug messages. This patch changes the default log level to VIR_LOG_INFO when using the default (unconfigured) log output to journald. To still allow debug logging to journad the user now has to explicitly specify journald as a log output with priority 1 in the log_outputs configuration option. This patch also changes the config file template to be explicit about this change and notify the user about the possible consequence of debug logging into journald. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1121955 --- daemon/libvirtd.c| 10 +- daemon/libvirtd.conf | 4 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/daemon/libvirtd.c b/daemon/libvirtd.c index 946081a..2783c97 100644 --- a/daemon/libvirtd.c +++ b/daemon/libvirtd.c @@ -678,7 +678,15 @@ daemonSetupLogging(struct daemonConfig *config, (godaemon || !isatty(STDIN_FILENO))) { char *tmp; if (access(/run/systemd/journal/socket, W_OK) = 0) { -if (virAsprintf(tmp, %d:journald, virLogGetDefaultPriority()) 0) +virLogPriority priority = virLogGetDefaultPriority(); + +/* By default we don't want to log too much stuff into journald as + * it may employ rate limiting and thus blocking libvirt execution. + */ +if (priority == VIR_LOG_DEBUG) +priority = VIR_LOG_INFO; + +if (virAsprintf(tmp, %d:journald, priority) 0) goto error; virLogParseOutputs(tmp); VIR_FREE(tmp); ACK, matches what I suggested we do previously. Regards, 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 :| -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list