Upgrading from ETCD 0.4.9 to ETCD 2.x

[Sivaram Kannan]

Hi,

I am planning to migrate my coreos cluster which are running 647.0.0 to current stable and upgrade the ETCD data to 2.x. According to the doc https://coreos.com/etcd/docs/2.0.8/backward_compatibility.html - the datadir will auto-migrate to the current version(The document describing migration form 0.4.0 t0 2.x seems empty). I don't see auto-migration happening. Can someone tell me how the migration can be done. I am expecting, the fleet units that I have triggered in etcd 0.4.9 is all retained when I migrated to 2.x.

Thanks,
./Siva.

[anton....@coreos.com]

Dear Siva,

You have to stop your old etcd cluster first. Unfortunately there is no way to upgrade etcd 0.4 to 2.x without stop.

Regards,

Anton

[Sivaram Kannan]

Stopping the running cluster is fine. Say I have triggered a number of tasks using fleet in the older version, after migration, would I be able to restart the services? That is what I could not make it work. Would that work?

Thanks,
./Siva.

[Sivaram Kannan]

Previous question does not make sense. Say If I had stored some data in previous etcd version, will I be able to retain the stored data after upgrading to 2.0?

[anton....@coreos.com]

Hi Siva,

Yes you can. Anyway I recommend you to make a backup before migration process.

Regards,

Anton

[Yicheng Qin]

It is recommended to use snapshot migration (https://github.com/coreos/etcd/blob/release-2.1/Documentation/backward_compatibility.md#snapshot-migration), which could be clean and safe. 

[Sivaram Kannan]

Thanks. That looks perfect. I stopped reading two lines before when I the link to Migration data tool doc was empty. Will try that and report back.

Thanks,
./Siva.