ClusterAllFailedError: Failed to refresh slots cache.
Problem
Hi All. i have following error can You help me ? `[ioredis] Unhandled error event: ClusterAllFailedError: Failed to refresh slots cache.` code is following. `"use strict"; require('./config/config'); const Redis = require('ioredis'); (async()=> { const startupNodes = [ {host: process.env.REDIS_HOST_1, port: process.env.REDIS_PORT }, {host: process.env.REDIS_HOST_2, port: process.env.REDIS_PORT} ]; const options = { slotsRefreshTimeout: 2000, dnsLookup: (address, callback) => callback(null, address), redisOptions: { tls: {}, password: process.env.REDIS_PASS, }, }; const cluster = new Redis.Cluster(startupNodes, options); console.log(cluster); })();`
Error Output
error can You help me ?
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1 Fix
Fix ClusterAllFailedError in ioredis Configuration
The error 'ClusterAllFailedError: Failed to refresh slots cache' typically occurs when the Redis cluster nodes are unreachable or misconfigured. This can happen due to incorrect hostnames, ports, or network issues preventing the application from connecting to the cluster nodes.
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- 1
Verify Redis Cluster Node Configuration
Ensure that the environment variables REDIS_HOST_1 and REDIS_HOST_2 are correctly set to the valid IP addresses or hostnames of your Redis cluster nodes. Also, confirm that the REDIS_PORT is correct and accessible.
typescriptconsole.log(`Host 1: ${process.env.REDIS_HOST_1}, Port: ${process.env.REDIS_PORT}`); console.log(`Host 2: ${process.env.REDIS_HOST_2}, Port: ${process.env.REDIS_PORT}`); - 2
Check Network Connectivity
Test the network connectivity to the Redis cluster nodes from the application server. Use tools like `ping` or `telnet` to check if the nodes are reachable on the specified ports.
bashtelnet <REDIS_HOST_1> <REDIS_PORT> telnet <REDIS_HOST_2> <REDIS_PORT> - 3
Increase slotsRefreshTimeout
If the cluster nodes are reachable but the error persists, try increasing the `slotsRefreshTimeout` in the options to allow more time for the slots cache to refresh.
typescriptconst options = { slotsRefreshTimeout: 5000, // Increased timeout dnsLookup: (address, callback) => callback(null, address), redisOptions: { tls: {}, password: process.env.REDIS_PASS, }, }; - 4
Check Redis Cluster Health
Use the Redis CLI to check the health of the cluster. Run the command `redis-cli -c -h <REDIS_HOST_1> -p <REDIS_PORT> cluster info` and ensure that all nodes are in a healthy state.
bashredis-cli -c -h <REDIS_HOST_1> -p <REDIS_PORT> cluster info - 5
Review Redis Logs
Check the logs of the Redis cluster nodes for any errors or warnings that might indicate issues with node connectivity or configuration. This can provide insights into why the slots cache cannot be refreshed.
bashcat /var/log/redis/redis-server.log
Validation
After applying the fixes, restart your application and monitor the logs for any occurrences of the ClusterAllFailedError. Additionally, ensure that the application can successfully connect to the Redis cluster and perform operations without errors.
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Environment
Submitted by
Alex Chen
2450 rep