# Test the fault tolerant mechanism for ES cluster nodes
**URL:** https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160
**Category:** Elasticsearch
**Created:** [January 8, 2020, 6:25am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160 "2020-01-08T06:25:40Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@pyerunka](https://discuss.elastic.co/u/pyerunka)
#### Post date: [January 8, 2020, 6:25am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/1 "2020-01-08T06:25:40Z")
Hello,
I have configured 3 node ES cluster.
All 3 nodes are master eligible. So if one goes down other should be eligible to elect itself as a master node and will form a 2 node cluster.
How i can check this with my cluster?
Can anyone guide me on this more?
Regards,
Priyanka
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 8, 2020, 6:45am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/2 "2020-01-08T06:45:20Z")
This is correct.just kill one the master node and you'll see that happening.
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### Author:  [@pyerunka](https://discuss.elastic.co/u/pyerunka)
#### Post date: [January 8, 2020, 6:58am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/3 "2020-01-08T06:58:38Z")
Hello @dadoonet,
And where i can see exactly this means one master is down and other node elect itself as master node and remaining 2 nodes are communicating with each other.
How i can check this is happening? like any UI is there?
will kibana help me in this?
Regards,
Priyanka
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 8, 2020, 7:36am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/4 "2020-01-08T07:36:08Z")
```
GET /_cat/nodes?v
```
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### Author:  [@pyerunka](https://discuss.elastic.co/u/pyerunka)
#### Post date: [January 8, 2020, 9:18am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/5 "2020-01-08T09:18:39Z")
Hello @dadoonet,
I have tried mentioned command.
First i have killed one master node. and after that ran this command.
I can see only 2 nodes after that.
How to check in that 2 nodes which one is master node?
and how to confirm that those remaining 2 nodes are serving queries for us?
Regards,
Priyanka
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 8, 2020, 10:08am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/6 "2020-01-08T10:08:55Z")
The command I shared gives you that information. What is its output?
---
### Author:  [@pyerunka](https://discuss.elastic.co/u/pyerunka)
#### Post date: [January 8, 2020, 10:22am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/7 "2020-01-08T10:22:51Z")
Hello @dadoonet,
That command showing remaining 2 nodes names and some values for heap.percent, ram.percent, cpu ,load\_1m, load\_5m, load\_15m ,node.role.
Not able to identify which node is master node.
Regards,
Priyanka
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### Author:  [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)
#### Post date: [January 8, 2020, 10:25am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/8 "2020-01-08T10:25:53Z")
The identity of the master node is not relevant. It may change at any time. It is sufficient to check that `GET _cluster/health` reports `green` (or `yellow`).
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### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 8, 2020, 11:04am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/9 "2020-01-08T11:04:46Z")
If you had share the full output, I could have tell.
Anyway, look at `node.role`.
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### Author:  [@The-oo](https://discuss.elastic.co/u/The-oo)
#### Post date: [January 8, 2020, 11:08am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/10 "2020-01-08T11:08:53Z")
Strangely i got an issue with this. If i kill my current master node the role does not get switch and my cluster become unavailable while having 3 master eligible node on my cluster
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### Author:  [@pyerunka](https://discuss.elastic.co/u/pyerunka)
#### Post date: [January 8, 2020, 11:20am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/11 "2020-01-08T11:20:20Z")
Hello @dadoonet,
Please find below output:
ip master name : \* data node 1
heap.percent:16
ram.percent:27
cpu:5
load\_1m: null
load\_5m: null
load\_15\_m: null
node.master: dilm
ip master name : - data node 2
heap.percent:21
ram.percent:53
cpu:2
load\_1m: null
load\_5m: null
load\_15\_m: null
node.master: dilm
master is denoted by \* and data node with -.
I can see the difference. but node.master is showing dilm. what is that?
Reagrds,
Priyanka
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 8, 2020, 11:20am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/12 "2020-01-08T11:20:25Z")
I believe you are talking about [Master role does not switch automaticaly](https://discuss.elastic.co/t/master-role-does-not-switch-automaticaly/214213). Let's keep your question there.
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 8, 2020, 11:23am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/13 "2020-01-08T11:23:00Z")
Please don't post images of text as they are hard to read, may not display correctly for everyone, and are not searchable.
Instead, paste the text and format it with `` icon or pairs of triple backticks (```), and check the preview window to make sure it's properly formatted before posting it. This makes it more likely that your question will receive a useful answer.
It would be great if you could update your post to solve this.
Here is what I can see on my side:
```auto
ip heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name
172.23.0.2 8 94 2 0.16 0.07 0.06 dilm * c4c5acf93d1e
```
As you can see there is a `master` field with a `*` for the current master node.
That's what you're looking for I think.
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### Author:  [@pyerunka](https://discuss.elastic.co/u/pyerunka)
#### Post date: [January 8, 2020, 11:29am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/14 "2020-01-08T11:29:35Z")
Hello @dadoonet,
I do not want to display ip addresses as company policy. so that is why i was updating it in excel.
Now i have edited the post.
Yes i can find now which is the master node by symbol \*.
In node.master, i can see dilm is mentioned.
what does that mean?
Regards,
Priyanka
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 8, 2020, 11:49am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/15 "2020-01-08T11:49:08Z")
It's documented here: [https://www.elastic.co/guide/en/elasticsearch/reference/current/cat-nodes.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/cat-nodes.html)
---
### Author:  [@pyerunka](https://discuss.elastic.co/u/pyerunka)
#### Post date: [January 8, 2020, 11:51am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/16 "2020-01-08T11:51:14Z")
Hello @dadoonet,
Thanks for help!!
I got it now.
Regards,
Priyanka
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 5, 2020, 11:51am UTC](https://discuss.elastic.co/t/test-the-fault-tolerant-mechanism-for-es-cluster-nodes/214160/17 "2020-02-05T11:51:15Z")
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