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• SyslogdAndLogrotate

Using syslogd and logrotate to manage the server's log files

destination myserverlog { file("/var/log/myserverlog" 
                          owner("root") 
                          group("adm") 
                          perm(0644)); };  
# TODO: made the log file readable for everyone
# should be: perm(0640);

filter f_myserver { facility(local0); };  # all priorities match!

log { source(src); filter(f_myserver);  destination(myserverlog); };

# This is the default behavior of sysklogd package
# Logs may come from unix stream, but not from another machine.
#
source src { unix-stream("/dev/log"); internal(); file("/proc/kmsg" log_prefix("kernel: ")); };

# kill -HUP `/bin/cat /var/run/syslog-ng.pid`

$ logger -p local0.info "This is a test line"

$ tail -f /var/log/myserverlog
Nov 18 20:00:55 mpino1301 logger: This is a test line

#include <syslog.h>

int main(int argc, char**argv)
{
  openlog(argv[0],   /* string constant prepended to every message */
          LOG_PID,   /* option: include PID with each message */
          LOG_LOCAL0 /* facility to log */);

  syslog(LOG_WARNING, "Just logged %s", "this warning.");

  syslog(LOG_ERR, "There were %d floating point errors.", 4711);

  closelog();
}