Shulou(Shulou.com)06/02 Report--

Try to upgrade smoothly to ensure the stability of the cluster online.

1. Etcd

Through the official documents, we found. Starting from 1.6, the cluster needs etcd version 3.0. at present, the data between etcd2.0 and 3.0are not interoperable.

Known issues:

1. The version of etcd and go

V3.0.x should use Go 1.6.x

V3.1.x should use Go 1.7.x

Github url

Https://github.com/coreos/etcd/issues/6951

Etcd cluster will be changed to 3. 0 only if all nodes are above version 3.

Therefore, it can be smoothly upgraded to 1.6.

Use a self-written script to call kubernetes api to read the data and save it to a database (such as mysql)

Then, when the etcd cluster is upgraded to 3.0, the script is used to call kubernetes api to write the data back to etcd3.0.

It is a good idea to back up etcd data before upgrading. If there is a problem, just downgrade the etcd cluster to version 2.x.

Because the data of etcd2.x and 3.x coexist, but they don't communicate with each other.

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