Redis

redis-cli, working with keys and TTL, monitoring and finding big keys.

Connecting

Connect

redis-cli -h <host> -p <port>

Connect with a password and select a database

redis-cli -h <host> -p <port> -a <password> -n 0

Check availability

redis-cli -h <host> ping

Set a value with a 1 hour TTL

SET <key> value EX 3600

Get a value

GET <key>

Remaining TTL in seconds

TTL <key>

Key type

TYPE <key>

Find keys by pattern (safe for production)

redis-cli -h <host> --scan --pattern 'user:*'

Don't use KEYS * in production — it blocks the server.

Delete keys by patternadvanced

redis-cli -h <host> --scan --pattern 'cache:*' | xargs -r -L 100 redis-cli -h <host> UNLINK

General info and memory

redis-cli -h <host> INFO memory

Number of keys

DBSIZE

Biggest keysadvanced

redis-cli -h <host> --bigkeys

Memory used by a keyadvanced

MEMORY USAGE <key>

Slow queries

SLOWLOG GET 10

Watch all commands in real timeadvanced

redis-cli -h <host> MONITOR

Heavily loads the server — use only for short debugging sessions.

Server latency

redis-cli -h <host> --latency