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PING

Last updated 
PING [message]
Group
Connection
Complexity
O(1)
Arity
-1 (at least 1 words, counting the command name)
Flags
fast
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PING checks that the server is reachable and processing commands. Without an argument it replies PONG. With an argument it replies with that argument. Health checks, connection pools and latency probes use it.

PING also works on a connection that is subscribed to channels (see SUBSCRIBE), where most other commands are refused.

Return value

Section titled “Return value”
Case RESP2 RESP3
No argument Simple string PONG Simple string PONG
With message message as a bulk string message as a bulk string
No argument, connection subscribed Array of "pong" and an empty string Simple string PONG
With message, connection subscribed Array of "pong" and message message as a bulk string

More than one argument is refused with ERR wrong number of arguments for 'ping' command.

Examples

Section titled “Examples”
127.0.0.1:6379> PING
PONG
127.0.0.1:6379> PING "are you there?"
"are you there?"

Compatibility

Section titled “Compatibility”

Same replies as Redis 7 and Valkey 8, including the two-element reply on a subscribed RESP2 connection.

See also

Section titled “See also”

ECHO, HELLO, TIME