Package starcluster :: Package commands :: Module addnode
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Source Code for Module starcluster.commands.addnode

  1  from completers import ClusterCompleter 
  2   
  3   
4 -class CmdAddNode(ClusterCompleter):
5 """ 6 addnode [options] <cluster_tag> 7 8 Add a node to a running cluster 9 10 Examples: 11 12 $ starcluster addnode mycluster 13 14 This will launch a new node and add it to mycluster. The node's alias will 15 be autogenerated based on the existing node aliases in the cluster. 16 17 If you want to provide your own alias for the node use the -a option: 18 19 $ starcluster addnode -a mynode mycluster 20 21 This will add a new node called 'mynode' to mycluster. 22 23 You can also add multiple nodes using the -n option: 24 25 $ starcluster addnode -n 3 mycluster 26 27 The above example will add three new nodes to mycluster with autogenerated 28 aliases. If you'd rather provide your own aliases: 29 30 $ starcluster addnode -a mynode1,mynode2,mynode3 mycluster 31 32 This will add three new nodes to mycluster named mynode1, mynode2, and 33 mynode3. 34 35 If you've previously attempted to add a node and it failed due to a plugin 36 error or other bug or if you used the 'removenode' command with the '-k' 37 option and wish to re-add the node to the cluster without launching a new 38 instance you can use the '-x' option: 39 40 $ starcluster addnode -x -a mynode1 mycluster 41 42 NOTE: The -x option requires the -a option 43 44 This will add 'mynode1' to mycluster using the existing instance. If no 45 instance exists with the alias specified by the '-a' option an error is 46 reported. You can also do this for multiple nodes: 47 48 $ starcluster addnode -x -a mynode1,mynode2,mynode3 mycluster 49 """ 50 names = ['addnode', 'an'] 51 52 tag = None 53
54 - def addopts(self, parser):
55 parser.add_option("-a", "--alias", dest="alias", 56 action="append", type="string", default=[], 57 help="alias to give to the new node " 58 "(e.g. node007, mynode, etc.)") 59 parser.add_option("-n", "--num-nodes", dest="num_nodes", 60 action="store", type="int", default=1, 61 help="number of new nodes to launch") 62 parser.add_option("-x", "--no-create", dest="no_create", 63 action="store_true", default=False, 64 help="do not launch new EC2 instances when " 65 "adding nodes (use existing instances instead)")
66
67 - def _get_duplicate(self, lst):
68 d = {} 69 for item in lst: 70 if item in d: 71 return item 72 else: 73 d[item] = 0
74
75 - def execute(self, args):
76 if len(args) != 1: 77 self.parser.error("please specify a cluster <cluster_tag>") 78 tag = self.tag = args[0] 79 aliases = [] 80 for alias in self.opts.alias: 81 aliases.extend(alias.split(',')) 82 if 'master' in aliases: 83 self.parser.error("'master' is a reserved alias") 84 num_nodes = self.opts.num_nodes 85 if num_nodes == 1 and aliases: 86 num_nodes = len(aliases) 87 if num_nodes > 1 and aliases and len(aliases) != num_nodes: 88 self.parser.error("you must specify the same number of aliases " 89 "(-a) as nodes (-n)") 90 dupe = self._get_duplicate(aliases) 91 if dupe: 92 self.parser.error("cannot have duplicate aliases (duplicate: %s)" % 93 dupe) 94 if not self.opts.alias and self.opts.no_create: 95 self.parser.error("you must specify one or more node aliases via " 96 "the -a option when using -x") 97 self.cm.add_nodes(tag, num_nodes, aliases=aliases, 98 no_create=self.opts.no_create)
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