Joining of machines in a connected instance group of a networked computing environment
A system for building and maintaining a connected instance group of machines includes protocols for instance group creation; master machine creation, operation, and recovery; and peer machine creation, operation, and recovery. These protocols allow each machine to connect with a data source and to build a local hosts file containing the name and IP addresses of the machines in the instance group and, thus, provides network connectivity among the machines in the instance group.
1. A method for a machine joining an instance group in a networked computing environment to connect with other machines associated with the instance group, the method comprising:
determining, by the machine joining the instance group, an IP address of the machine;
communicating, by the machine joining the instance group, with a data source external to the instance group and associated with the networked computing environment, group name information associated with the instance group and the IP address, wherein the data source stores information for a plurality of instance groups, the plurality of instance groups including the instance group;
receiving, by the machine joining the instance group, from the data source, IP addresses for a master machine and the other machines associated with the instance group, the master machine operable to provide a messaging service for the instance group via a message service server;
connecting, by the machine joining the instance group, to the instance group;
launching, by the machine joining the instance group, a message service client and connecting the message service client to the message service server at the master machine; and
announcing, by the machine joining the instance group to the master machine and the other machines, via the connection between the message service client and the master service server, the joining of the machine to the instance group.
2. The method of claim 1 , wherein the announcing the joining of the machine to the instance group comprises announcing the IP address and a name associated with the machine joining the instance group.
3. The method of claim 1 , further comprising:
if the instance group is empty, naming the machine a name associated with a master host.
4. The method of claim 1 , further comprising listening for peer machines joining the instance group.
5. The method of claim 1 , further comprising:
at a regular time period, pinging the data source for IP addresses for the other machines associated with the instance group.
6. The method of claim 1 , further comprising creating the instance group at the data source.
7. The method of claim 1 , further comprising:
if the instance group already has a master host, naming the machine a name associated with a peer machine.
8. The method of claim 1 , further comprising writing, to a local host file, the IP addresses for the other machines associated with the instance group.
9. The method of claim 1 , further comprising writing, to a local host file, the IP address of the machine.