Added connections and memory monitoring

modules/nagios/files/check_memory

Index: modules/nagios/files/check_memory
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new file mode 100644
--- /dev/null
+++ b/modules/nagios/files/check_memory
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+
+import re
+
+def format_memory(bytes):
+  if bytes >= 1024*1024:

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

Whitespace around *, as below?

+    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__":
+  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()
+      match = re.match(r"^(\d+)\s+(kb|mb|gb)$", value, re.IGNORECASE)
+      if match:
+        value = int(match.group(1)) * 1024
+        if match.group(2).lower() != "kb":
+          value *= 1024
+          if match.group(2).lower() != "mb":
+            value *= 1024
+      else:
+        value = int(value)
+
+      if label == "memtotal":
+        memtotal = value
+      elif label == "memfree":
+        memfree = value
+      elif label == "swaptotal":
+        swaptotal = value
+      elif label == "swapfree":
+        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)
+
+  output = "%s|%s" % (status, perfdata)
+
+  print "OK - " + output