--- /dev/null
+#!/usr/bin/env python
+
+# This demonstrates a node group configurations.
+#
+# Node groups can be defined with the syntax "-g N@IP0,IP1-IP2,IP3".
+# This says to create a group of N nodes with IPs IP0, IP1, ..., IP2,
+# IP3. Run it with deterministic IPs causes lots of gratuitous IP
+# reassignments. Running with --nd fixes this.
+
+import ctdb_takeover
+from optparse import make_option
+import string
+
+ctdb_takeover.process_args([
+ make_option("-g", "--group",
+ action="append", type="string", dest="groups"),
+ ])
+
+def expand_range(r):
+ sr = r.split("-", 1)
+ if len(sr) == 2:
+ all = string.ascii_uppercase + string.ascii_lowercase
+ sr = list(all[all.index(sr[0]):all.index(sr[1])+1])
+ return sr
+
+def add_node_group(s):
+ (count, ips_str) = s.split("@", 1)
+ ips = [i for r in ips_str.split(",") \
+ for i in expand_range(r) if r != ""]
+ for i in range(int(count)):
+ c.add_node(ctdb_takeover.Node(ips))
+
+c = ctdb_takeover.Cluster()
+
+for g in ctdb_takeover.options.groups:
+ add_node_group(g)
+
+c.recover()
+
+c.random_iterations()