Bobcares

Redis Error: ERR This instance has cluster support disabled

by | Jan 31, 2025

Learn how to fix Redis Error: ERR This instance has cluster support disabled. Our Redis Support team is here to help you with your questions and concerns.

Redis Error: ERR This instance has cluster support disabled | Solution

You are likely to run into the “ERR This instance has cluster support disabled” error in Redis when trying to use Redis Cluster functionality on an instance that is not properly configured for cluster mode.

Redis Error: ERR This instance has cluster support disabled | SolutionThis error indicates that Redis is not running in cluster mode, making it unable to support multi-node data distribution and automated failover mechanisms.

In other words, this error will disrupt distributed database operations, preventing automatic data sharding, high availability, and horizontal scaling.

Today, we will look at the causes, impacts, and solutions for resolving this error and ensuring proper Redis Cluster configuration.

Impacts of the Error

  • Prevents Redis from handling cluster-based connections.
  • Additionally, sharding and replication features become unavailable.
  • Also, any cluster-related settings are ignored.
  • Furthermore, it prevents scaling Redis infrastructure across multiple nodes.
  • It stops the automatic partitioning of data across multiple instances.
  • Prevents replicated and distributed caching strategies.
  • Redis fails to distribute traffic efficiently.
  • Also, nodes cannot failover automatically.

  • No synchronization across cluster nodes.
  • Data remains isolated on a single node.
  • Prevents fault tolerance and optimized storage management.
  • Furthermore, users must manually handle node distribution.
  • Clients require reconfiguration to access multiple standalone Redis nodes.
  • Additionally, applications relying on microservices cannot efficiently share cached data.
  • Prevents multi-node Redis deployments in cloud environments.
  • Also, Redis cannot automatically replace failed nodes.
  • Requires manual intervention for node failures.

This error can lead to potential consequences like:

  • Reduced System Resilience
  • Increased Operational Overhead
  • Limited Horizontal Scalability
  • Compromised Application Performance

Causes and Fixes

1. Cluster Support Not Enabled in Configuration

The Redis configuration file does not have cluster mode enabled.

Click here for the Solution.
  1. Locate the redis.conf file in your Redis installation directory.
  2. Then, confirm `cluster-config-file` is in a writable location.
  3. Open the configuration file using a text editor and add these cluster settings:


    # Redis Cluster Configuration
    port 7000 # Unique port for each node
    cluster-enabled yes # Enable cluster mode
    cluster-config-file nodes.conf # Auto-generated cluster configuration
    cluster-node-timeout 5000 # Node timeout in milliseconds
    appendonly yes # Enable persistence

  4. Finally, restart Redis to apply changes:

    sudo systemctl restart redis
    # Or manually
    redis-server /path/to/redis.conf

2. Incorrect Client Configuration

The Redis client is not configured to connect in cluster mode.

Click here for the Solution.
  • For Standalone Redis:

    import redis
    r = redis.Redis(host='localhost', port=6379)

  • For Redis Cluster:

    from redis.cluster import RedisCluster
    rc = RedisCluster(host='localhost', port=7000, decode_responses=True)

Here is the verification checklist:

  • Ensure the client library version matches the Redis version.
  • Confirm cluster support in the client library.
  • Furthermore, validate connection parameters.

3. Incomplete Cluster SetupThe 

Redis cluster is partially configured but not fully initialized.

Click here for the Solution.

The minimum requirements are:

  • At least 3 master nodes
  • Recommended: 6 nodes (3 masters, 3 replicas)

Here is the Cluster Creation command:


redis-cli --cluster create \
127.0.0.1:7000 \
127.0.0.1:7001 \
127.0.0.1:7002 \
--cluster-replicas 1

The validation steps include:

  • Confirm all nodes are running.
  • Also, verify network connectivity between nodes.
  • Then, check for a successful cluster initialization message.

4. Misconfigured Cluster Nodes

Cluster nodes have inconsistent settings.

Click here for the Solution.
  • Ensure identical `redis.conf` settings across all nodes.
  • Verify consistent `cluster-enabled yes` configuration.
  • Then. check network settings to allow inter-node communication.
  • Test connectivity:

    redis-cli -h 127.0.0.1 -p 7000 CLUSTER NODES

5. Port Configuration Issues

Incorrect port settings blocking cluster communication.

Click here for the Solution.

Here are the Port settings:

  • Client Port – Default 6379
  • Cluster Bus Port – Client port + 10000 (e.g., 16379)
  • Firewall Rules:

    sudo ufw allow 7000/tcp
    sudo ufw allow 17000/tcp

6. Insufficient Cluster Requirements

Cluster does not meet minimum node deployment standards.

Click here for the Solution.
  • Use at least 3 master nodes (preferably 6 nodes).
  • Then, implement 1:1 master-replica ratio for failover.
  • Additionally, distribute nodes across different cloud zones for redundancy.

7. Client Library Compatibility Issues

Using outdated or incompatible Redis client libraries.

Click here for the Solution.
  • First, update client libraries to the latest version. Here are the recommended Redis Libraries:
    • Python – `redis-py`
    • Java – `Lettuce`, `Jedis`
    • Node.js – `ioredis`
    • Go – `go-redis`
  • Then, check Library Version:

    import redis
    print(redis.__version__)

Prevention Strategies

  • Always explicitly enable cluster mode in Redis configuration.
  • Additionally, maintain consistent configurations across environments.
  • Perform pre-deployment cluster checks.
  • Furthermore, use automated scripts to verify cluster health.
  • Set up real-time Redis monitoring.
  • Also, maintain detailed documentation of Redis cluster settings.
  • Conduct cluster testing before production.
  • Additionally, simulate failover and recovery scenarios.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

The “ERR This instance has cluster support disabled” error in Redis can limit scalability, reliability, and performance.

In brief, our Support Experts demonstrated how to fix Redis Error: ERR This instance has cluster support disabled.

0 Comments

Submit a Comment

Your email address will not be published. Required fields are marked *

Never again lose customers to poor
server speed! Let us help you.

Privacy Preference Center

Necessary

Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.

PHPSESSID - Preserves user session state across page requests.

gdpr[consent_types] - Used to store user consents.

gdpr[allowed_cookies] - Used to store user allowed cookies.

PHPSESSID, gdpr[consent_types], gdpr[allowed_cookies]
PHPSESSID
WHMCSpKDlPzh2chML

Statistics

Statistic cookies help website owners to understand how visitors interact with websites by collecting and reporting information anonymously.

_ga - Preserves user session state across page requests.

_gat - Used by Google Analytics to throttle request rate

_gid - Registers a unique ID that is used to generate statistical data on how you use the website.

smartlookCookie - Used to collect user device and location information of the site visitors to improve the websites User Experience.

_ga, _gat, _gid
_ga, _gat, _gid
smartlookCookie
_clck, _clsk, CLID, ANONCHK, MR, MUID, SM

Marketing

Marketing cookies are used to track visitors across websites. The intention is to display ads that are relevant and engaging for the individual user and thereby more valuable for publishers and third party advertisers.

IDE - Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.

test_cookie - Used to check if the user's browser supports cookies.

1P_JAR - Google cookie. These cookies are used to collect website statistics and track conversion rates.

NID - Registers a unique ID that identifies a returning user's device. The ID is used for serving ads that are most relevant to the user.

DV - Google ad personalisation

_reb2bgeo - The visitor's geographical location

_reb2bloaded - Whether or not the script loaded for the visitor

_reb2bref - The referring URL for the visit

_reb2bsessionID - The visitor's RB2B session ID

_reb2buid - The visitor's RB2B user ID

IDE, test_cookie, 1P_JAR, NID, DV, NID
IDE, test_cookie
1P_JAR, NID, DV
NID
hblid
_reb2bgeo, _reb2bloaded, _reb2bref, _reb2bsessionID, _reb2buid

Security

These are essential site cookies, used by the google reCAPTCHA. These cookies use an unique identifier to verify if a visitor is human or a bot.

SID, APISID, HSID, NID, PREF
SID, APISID, HSID, NID, PREF