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Troubleshooting Common Issues

bash

Check Redis service status

sudo systemctl status redis-server

Check Redis logs

sudo journalctl -u redis-server tail -f /var/log/redis/redis-server.log

Test connectivity

redis-cli ping

Check configuration

redis-cli CONFIG GET "*"

Monitor memory usage

redis-cli INFO memory | grep used_memory

Check slow queries

redis-cli SLOWLOG GET 10 Performance Troubleshooting

bash
# Check for blocking operations
redis-cli INFO stats | grep blocked_clients
# Monitor command execution time
redis-cli --latency
# Check network latency
redis-cli --latency-history -h remote_host
# Analyze memory fragmentation
redis-cli INFO memory | grep mem_fragmentation_ratio

Common Issues and Solutions

  1. High Memory Usage: Implement memory policies, use appropriate data structures

  2. Slow Queries: Use SCAN instead of KEYS, optimize data structures

  3. Connection Issues: Check network, firewall, and Redis configuration

  4. Persistence Issues: Monitor disk space, check AOF/RDB settings

  5. Replication Lag: Monitor network, check master load