Connecting: URLs, TLS, AUTH & Select

Code

# Basic connect (default localhost:6379)
redis-cli

# Explicit host/port, with DB index (0-15)
redis-cli -h redis.example.com -p 6380 -n 3

# URL form (preferred for config)
redis-cli redis://user:[email protected]:6379/0
rediss://user:[email protected]:6379/0   # rediss:// = TLS

# AUTH (Redis 6+ uses ACL users; legacy: single password)
redis-cli -a 'yourpassword' --no-auth-warning
redis-cli --user alice -a 'alicepass' --no-auth-warning

# TLS
redis-cli --tls --cert client.crt --key client.key --cacert ca.crt -h redis.example.com

# Inside an interactive session
> AUTH alice alicepass
> SELECT 3
> QUIT

Explanation

redis-cli defaults to 127.0.0.1:6379 with DB 0. Use -h/-p/-n for explicit target, or pass a redis:// (or rediss:// for TLS) URL. -a supplies a password but leaks it in process listings — prefer AUTH inside the session, or use REDISCLI_AUTH env var. In Redis 6+, ACL introduces named users (--user + -a). SELECT switches the logical DB (0-15 by default); transactions and keys are scoped per-DB. --tls with cert/key/cacert covers mTLS.

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