# Running with es1.7 and es 2.1 in ONE cluster
**URL:** https://discuss.elastic.co/t/running-with-es1-7-and-es-2-1-in-one-cluster/37842
**Category:** Elasticsearch
**Created:** [December 23, 2015, 10:17am UTC](https://discuss.elastic.co/t/running-with-es1-7-and-es-2-1-in-one-cluster/37842 "2015-12-23T10:17:33Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@vus520](https://discuss.elastic.co/u/vus520)
#### Post date: [December 23, 2015, 10:17am UTC](https://discuss.elastic.co/t/running-with-es1-7-and-es-2-1-in-one-cluster/37842/1 "2015-12-23T10:17:33Z")
i have ten nodes (elasticsearch-1.7.2, logstash-1.5.4, kibana-4.1.2-linux-x64) and it's running well.
Now i want to add some nodes with newest elk version (elasticsearch-2.1.1, logstash-2.1.1, kibana-4.3.1-linux-x64). so there will have multiple version es in ONE cluster.
Is this ok ? Will this have a problem?
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [December 23, 2015, 12:41pm UTC](https://discuss.elastic.co/t/running-with-es1-7-and-es-2-1-in-one-cluster/37842/2 "2015-12-23T12:41:01Z")
That is not possible. All Elasticsearch nodes within a cluster need to be the same version.
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [December 23, 2015, 9:50pm UTC](https://discuss.elastic.co/t/running-with-es1-7-and-es-2-1-in-one-cluster/37842/3 "2015-12-23T21:50:09Z")
You can run different versions if you are doing a rolling upgrade on the same major version.
But you cannot run different major versions like you are wanting to do. An upgrade from 1.X to 2.X is a complete cluster restart.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 11:28pm UTC](https://discuss.elastic.co/t/running-with-es1-7-and-es-2-1-in-one-cluster/37842/4 "2017-07-05T23:28:59Z")