Added connections and memory monitoring

modules/nagios/files/check_memory

 #!/usr/bin/env python
 
-import re
+import re, argparse
 
 def format_memory(bytes):
-  if bytes >= 1024*1024:

[Felix Dahlke, 2013/10/01 14:05:33]

Whitespace around *, as below?

+  if bytes >= 1024 * 1024:
     return "%i MB" % (bytes / (1024 * 1024))

[Felix Dahlke, 2013/10/01 14:05:33]

Would actually prefer to use MiB here and KiB below, that'd avoid ambiguity.

[Wladimir Palant, 2013/11/04 07:54:41]

I would have to look up MiB and KiB every time, nobody uses that. Memory is
always measured "real" megabytes, no issue here. Note that there is a real
ambiguity concerning disk space but I don't think anybody has an issue with
check_disk using MB.

[Felix Dahlke, 2013/11/20 16:00:51]

It's not true that nobody uses it, but it's quite true that not everybody uses
it. I guess you're right, for memory sizes people typically expect MiB when it
says MB.

   elif bytes >= 1024:
     return "%i kB" % (bytes / 1024)
   else:
     return "%i bytes"
 
 if __name__ == "__main__":
+  parser = argparse.ArgumentParser(description="Determine the amount of available memory")
+  parser.add_argument("--physical-warn", dest="memwarn", type=int, default=-1, help="Warning threshold for available physical memory (in percent)")
+  parser.add_argument("--physical-critical", dest="memcrit", type=int, default=-1, help="Critical threshold for available physical memory (in percent)")
+  parser.add_argument("--swap-warn", dest="swapwarn", type=int, default=-1, help="Warning threshold for available swap memory (in percent)")
+  parser.add_argument("--swap-critical", dest="swapcrit", type=int, default=-1, help="Critical threshold for available swap memory (in percent)")
+  args = parser.parse_args()
+
   memtotal = None
   memfree = None
   swaptotal = None
   swapfree = None
   with open("/proc/meminfo", "r") as file:
     for line in file:
       label, value = line.split(None, 1)
 
       label = label.lower().rstrip(":")
       value = value.strip()
@@ skipping 17 matching lines @@
         swapfree = value
 
   mempercentage = round(float(memfree) / memtotal * 100)
   swappercentage = round(float(swapfree) / swaptotal * 100)
 
   status = "memory %i%% (%s/%s) swap %i%% (%s/%s)" % (
     mempercentage, format_memory(memfree), format_memory(memtotal),
     swappercentage, format_memory(swapfree), format_memory(swaptotal)
   )
 
-  perfdata = "memory=%i swap=%i" % (mempercentage, swappercentage)
+  perfdata = "memory=%i;%i;%i swap=%i;%i;%i" % (
+    mempercentage, args.memwarn, args.memcrit,
+    swappercentage, args.swapwarn, args.swapcrit
+  )
 
   output = "%s|%s" % (status, perfdata)
 
-  print "OK - " + output
+  if mempercentage <= args.memcrit or swappercentage <= args.swapcrit:
+    print "CRITICAL - " + output
+  elif mempercentage <= args.memwarn or swappercentage <= args.swapwarn:
+    print "WARNING - " + output
+  else:
+    print "OK - " + output