---
id: d03f6b86-6481-11ee-8c99-0242ac120002
---

# Elasticsearch Version Mismatch in Nodes
---

This incident type occurs when there is a version mismatch between the nodes in an Elasticsearch cluster. Elasticsearch is a distributed search and analytics engine that allows for real-time search and analysis of data. When nodes within the cluster have different versions of Elasticsearch installed, it can cause issues with data indexing, querying, and retrieval. This can lead to decreased performance, data inconsistencies, and even system downtime.

### Parameters
```shell
export LIST_OF_NODES="PLACEHOLDER"

export ANY_NODE="PLACEHOLDER"

export VERSION="PLACEHOLDER"

export NODE3="PLACEHOLDER"

export NODE1="PLACEHOLDER"

export NODE2="PLACEHOLDER"
```

## Debug

### 1. Check Elasticsearch version on each node
```shell
for node in ${LIST_OF_NODES}; do curl -s -XGET http://$node:9200 | jq '.version.number'; done
```

### 2. Check Elasticsearch cluster health status
```shell
curl -s -XGET http://${ANY_NODE}:9200/_cluster/health | jq '.status'
```

### 3. Check Elasticsearch cluster state
```shell
curl -s -XGET http://${ANY_NODE}:9200/_cluster/state | jq '.metadata.cluster_uuid'
```

### 4. Check Elasticsearch logs for version mismatch errors
```shell
grep -r "version mismatch" /var/log/elasticsearch/
```

## Repair

### Determine which version of Elasticsearch is the correct version for the cluster and ensure all nodes are running that version.
```shell


#!/bin/bash



# Define the correct version of Elasticsearch

ELASTICSEARCH_VERSION=${VERSION}



# Loop through all Elasticsearch nodes and check their version

for node in ${NODE1} ${NODE2} ${NODE3}

do

    # Get the version of Elasticsearch installed on the node

    node_version=$(ssh $node "rpm -qa | grep elasticsearch")



    # If the version on the node does not match the correct version, update it

    if [[ $node_version != *"$ELASTICSEARCH_VERSION"* ]]

    then

        ssh $node "yum install -y elasticsearch-$ELASTICSEARCH_VERSION"

        echo "Updated Elasticsearch on node $node to version $ELASTICSEARCH_VERSION"

    else

        echo "Elasticsearch on node $node is already at the correct version"

    fi

done



# Verify that all nodes are running the correct version of Elasticsearch

for node in ${NODE1} ${NODE2} ${NODE3}

do

    node_version=$(ssh $node "rpm -qa | grep elasticsearch")



    if [[ $node_version != *"$ELASTICSEARCH_VERSION"* ]]

    then

        echo "ERROR: Elasticsearch on node $node is not at the correct version"

        exit 1

    fi

done



echo "All nodes are running the correct version of Elasticsearch"


```


This incident type occurs when there is a version mismatch between the nodes in an Elasticsearch cluster. Elasticsearch is a distributed search and analytics engine that allows for real-time search and analysis of data. When nodes within the cluster have different versions of Elasticsearch installed, it can cause issues with data indexing, querying, and retrieval. This can lead to decreased performance, data inconsistencies, and even system downtime.


```shell
export LIST_OF_NODES="PLACEHOLDER"

export ANY_NODE="PLACEHOLDER"

export VERSION="PLACEHOLDER"

export NODE3="PLACEHOLDER"

export NODE1="PLACEHOLDER"

export NODE2="PLACEHOLDER"
```


### 1. Check Elasticsearch version on each node

```shell
for node in ${LIST_OF_NODES}; do curl -s -XGET http://$node:9200 | jq '.version.number'; done
```

### 2. Check Elasticsearch cluster health status

```shell
curl -s -XGET http://${ANY_NODE}:9200/_cluster/health | jq '.status'
```

### 3. Check Elasticsearch cluster state

```shell
curl -s -XGET http://${ANY_NODE}:9200/_cluster/state | jq '.metadata.cluster_uuid'
```

### 4. Check Elasticsearch logs for version mismatch errors

```shell
grep -r "version mismatch" /var/log/elasticsearch/
```


### Determine which version of Elasticsearch is the correct version for the cluster and ensure all nodes are running that version.

```shell


#!/bin/bash



# Define the correct version of Elasticsearch

ELASTICSEARCH_VERSION=${VERSION}



# Loop through all Elasticsearch nodes and check their version

for node in ${NODE1} ${NODE2} ${NODE3}

do

    # Get the version of Elasticsearch installed on the node

    node_version=$(ssh $node "rpm -qa | grep elasticsearch")



    # If the version on the node does not match the correct version, update it

    if [[ $node_version != *"$ELASTICSEARCH_VERSION"* ]]

    then

        ssh $node "yum install -y elasticsearch-$ELASTICSEARCH_VERSION"

        echo "Updated Elasticsearch on node $node to version $ELASTICSEARCH_VERSION"

    else

        echo "Elasticsearch on node $node is already at the correct version"

    fi

done



# Verify that all nodes are running the correct version of Elasticsearch

for node in ${NODE1} ${NODE2} ${NODE3}

do

    node_version=$(ssh $node "rpm -qa | grep elasticsearch")



    if [[ $node_version != *"$ELASTICSEARCH_VERSION"* ]]

    then

        echo "ERROR: Elasticsearch on node $node is not at the correct version"

        exit 1

    fi

done



echo "All nodes are running the correct version of Elasticsearch"


```


Elasticsearch Version Mismatch in Nodes

Overview

Parameters

Debug

1. Check Elasticsearch version on each node

2. Check Elasticsearch cluster health status

3. Check Elasticsearch cluster state

4. Check Elasticsearch logs for version mismatch errors

Repair

Determine which version of Elasticsearch is the correct version for the cluster and ensure all nodes are running that version.

Learn more

Related Runbooks

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