In the client list, Redis prints one line for each connected client. From the redis.h and network.c files of the Redis source code:
- addr: client address / port
- fd: file descriptor matching socket
- idle: connection idle time in seconds
- flags: client flags (see below)
- db: current database id
- sub: number of channel subscribers
- psub: number of signatures matching the pattern
- qbuf: request buffer length (0 means the request is not expected)
- obl: output buffer length
- oll: length of the output list (responses are queued in this list when the buffer is full)
- events: file descriptor events (see below)
- cmd: last command played
Customer flags can be a combination of:
- O: the client is a slave in MONITOR mode.
- S: the client is a regular slave server
- M: the client is a master
- x: client is in MULTI / EXEC context
- b: client is waiting in a lock operation
- i: client is waiting for VM I / O
- d: changed watched keys have been changed - EXEC will fail
- c: the connection will be closed after writing the full answer
- u: client is unlocked
- N: no specific set of flags
File descriptor events can be:
- r: client socket readable (event loop)
- w: client socket is writable (event loop)
This is my interpretation, please take it with salt.