The CLIENT LIST command returns information and statistics about the client connections server in a mostly human readable format.
Bulk string reply: a unique string, formatted as follows:
- One client connection per line (separated by LF)
- Each line is composed of a succession of
property=valuefields separated by a space character.
Here is the meaning of the fields:
id: an unique 64-bit client ID (introduced in Redis 2.8.12).
addr: address/port of the client
fd: file descriptor corresponding to the socket
age: total duration of the connection in seconds
idle: idle time of the connection in seconds
flags: client flags (see below)
db: current database ID
sub: number of channel subscriptions
psub: number of pattern matching subscriptions
multi: number of commands in a MULTI/EXEC context
qbuf: query buffer length (0 means no query pending)
qbuf-free: free space of the query buffer (0 means the buffer is full)
obl: output buffer length
oll: output list length (replies are queued in this list when the buffer is full)
omem: output buffer memory usage
events: file descriptor events (see below)
cmd: last command played
The client flags can be a combination of:
O: the client is a slave in MONITOR mode S: the client is a normal slave server M: the client is a master x: the client is in a MULTI/EXEC context b: the client is waiting in a blocking operation i: the client is waiting for a VM I/O (deprecated) d: a watched keys has been modified - EXEC will fail c: connection to be closed after writing entire reply u: the client is unblocked U: the client is connected via a Unix domain socket r: the client is in readonly mode against a cluster node A: connection to be closed ASAP N: no specific flag set
The file descriptor events can be:
r: the client socket is readable (event loop) w: the client socket is writable (event loop)
New fields are regularly added for debugging purpose. Some could be removed in the future. A version safe Redis client using this command should parse the output accordingly (i.e. handling gracefully missing fields, skipping unknown fields).