# Is it possible to have an isolated node in a cluster?
**URL:** https://discuss.elastic.co/t/is-it-possible-to-have-an-isolated-node-in-a-cluster/112441
**Category:** Elasticsearch
**Created:** [December 19, 2017, 1:32pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-an-isolated-node-in-a-cluster/112441 "2017-12-19T13:32:10Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@WoJ](https://discuss.elastic.co/u/WoJ)
#### Post date: [December 19, 2017, 1:32pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-an-isolated-node-in-a-cluster/112441/1 "2017-12-19T13:32:10Z")
Hello everyone,
I have a cluster of a few nodes, all on the same subnet. They all see each other and I can query either for data (or push data to). A classical basic setup of sorts.
I am now faced with the problem of having one extra node located in a place which is reachable **FROM** the existing cluster (outgoing connections) but that node canot initiate connection **TO** the cluster. The typical case is a cluster in a LAN and the extra node in a DMZ which can be only cheached "into" (that is a host in the DMZ cannot initiate connections).
**Is this a viable setup for Elasticsearch?**
There are several cases which I could works with (from the dream one to the most restrictive):
- the new node is fully operational, it accepts PUT/POST requests and the received data is further propagated to the cluster, new data in the cluster is synchronized to it as well
- the new node is read-only, that is I can issue GET requests and get the data in the cluster, but not update the cluster (the cluster pushes new data, the node holds its share of shards)
- the new node is as above, but it holds a copy of all data in the cluster (the cluster pushes the data)
The traffic towards the new node is fine-tunable (from a port opening perspective). Traffic initiated from the node to the LAN is not possible in any case.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 16, 2018, 1:32pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-an-isolated-node-in-a-cluster/112441/2 "2018-01-16T13:32:29Z")
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