Perhaps I should ask the question differently. Can someone elaborate on what 'cluster replace' does and how the command is affected by node names that change after riak starts up ?
Thanks -Deepak On Wed, Jan 2, 2013 at 1:13 AM, Deepak Balasubramanyam < deepak.b...@gmail.com> wrote: > I took the AWS EC2 riak image for a spin today. I have a query regarding > riak nodes and how they behave when the machine reboots. > > When an EC2 instance reboots, the internal ip / internal DNS / external > DNS change. This renders the app.config and -name argument on vm.args > incorrect. I was exploring solutions to deal with this problem. > > *1. Preventive measures* > > Someone on this thread dated May > 2011<http://riak-users.197444.n3.nabble.com/EC2-and-node-names-td2892047.html> > suggested > using host file entries that point to the local internal IP address. That > does not seem to work. Riak fails with the following error when I add a new > entry to /etc/hosts and configure vm.args with -name riak@riaknode1 > > Hostname riaknode1 is illegal > > I confirmed that riaknode1 pings correctly before starting riak. I guess > erlang tries to match the hostname of the system resulting in this failure > ? Can anyone throw some light on this ? > > *2. Use -sname* > > Is starting the erlang VM with the sname flag an option if it will help > prevent the 'illegal hostname' error ? > Disclaimer: My knowledge of erlang is close to zilch, so sorry if that > option sounded like something you could dismiss easily :) > > *3. Use cluster replace > * > > a. I understand that the IPs in app.config and vm.args can be replaced > with the correct IP on a restart and using a subsequent 'cluster replace' > command will do. Will executing the 'cluster plan' and 'cluster commit' > commands now produce network chatter ? > > b . What happens if 2 nodes go down and one was joined with the other. > They both have 2 different IP addresses on restart. How will 'cluster > replace' work now ? > > Do let me know your thoughts. > > Thanks > -Deepak >
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