Redis
Redis
compare to memcached
- support persistant volume
- RDB
- AOF
- support multiple data types
- pub/sub
commands
- redis-cli: command line interface
- redis-sentinel: cluster managing tool
- redis-server: run server
- redis-benchmark: stress testing
- redis-check-aof: check AOF
- redis-check-dump: check RDB
configuration
Use redis.conf. Docker official redis image not contain this file. Mount it yourself or through redis-server arguments.
types
- String: get, set, mget, mset
- Integer: incr, decr, setbit
- List: lpush, lrange, lpop
- Hash Map: hset, hget, hmset, hmget
- Set: sadd, smember, sdiff, sinter, sunion
use docker
Before start
To connect a container, you need to know the name and the port, in the associated networks to be able to discover the service.
There is no DNS resolution in docker deault bridge network. In default network, you need to specify --link to connect the containers. The --link is a legacy feature.
Therefore, create a user-defined network is recommanded, it provide automatic DNS resolution.
Create a bridge newrok
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docker network create test |
Run a redis instance in user-defined network
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docker run --name redis -d --network test redis:4.0 |
Run a redis-cli connect to the redis instance
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docker run -it --network test redis:4.0 redis-cli -h redis |
Transaction
all commands are executed as a single isolated operation, serialized and executed sequentially
atomic: all failed or all succeed
- MULTI: open a transaction and always return OK
- EXEC: execute commands in transaction
- DISCARD: flush commands and exit transaction
- WATCH: check and set, if watched key changes, not execute
Errors
- before EXEC: e.g. syntax error
- after EXEC: e.g. value error
The pipeline discarding the transaction automatically if there was an error during the command queueing
… To be continued