add initial logging support

This logging infrastructure in cloudinit:
- uses python logging
- allows user supplied config of logging.config.fileConfig format to be
  supplied in /etc/cloud/cloud.cfg or in cloud_config by user data.
- by default, tries to use syslog, if that is not available, writes directly to
  /var/log/cloud-init.log (syslog will not be available yet when cloud-init
  runs)
- when using syslog, the doc/21-cloudinit.conf file provides a rsyslogd
  file to be placed in /etc/rsyslog.d/ that will file [CLOUDINIT] messages
  to /var/log/cloud-init.log

1 files changed, 7 insertions, 1 deletions

diff --git a/cloud-init.py b/cloud-init.py
index 15a98957..924f3350 100755
--- a/cloud-init.py
+++ b/cloud-init.py
@@ -23,6 +23,7 @@ import sys
 import cloudinit
 import cloudinit.util as util
 import time
+import logging
 
 def warn(str):
     sys.stderr.write(str)
@@ -37,9 +38,14 @@ def main():
        warn("unable to open /proc/uptime\n")
        uptime = "na"
 
-    sys.stderr.write("cloud-init running: %s. up %s seconds\n" % (now, uptime))
+    msg = "cloud-init running: %s. up %s seconds\n" % (now, uptime)
+    sys.stderr.write(msg)
     sys.stderr.flush()
 
+    cloudinit.logging_set_from_cfg_file()
+    log = logging.getLogger()
+    log.info(msg)
+
     # cache is not instance specific, so it has to be purged
     cloudinit.purge_cache()