redis commands

node, that is, the current node. The status of the entire cluster is fail. 4. Allocate hash slot Through the above operations, we have planned three independent Redis nodes to the same cluster. Have we completed all the work of cluster construction now? None! By checking the cluster status in Figure 2, we can know that the current cluster status is still fail. At this time, the Redis cluster does not work

versions.Analysis Jedis source code, the request retries reached the upper limit, still no successful request. Two-way analysis: Redis connection is not on? Or is the cluster node information inconsistent? Defect of survival detection mechanismThe Redis survival detection mechanism may be considered to be in the failed state and switch because of a slow query on the master node, blocking

duplicate, write value$redis->setnx (' key ', ' value ');$redis->setnx (' key ', ' value '); Delete Deletes the value of the specified keyReturns the number of keys that have been deleted (long integers)$redis->delete (' Key1 ', ' key2 ');$redis->delete (Array (' Key3 ', ' key4 ', ' key5 ')); TtlGet a key to the time

Deletes the value of the specified keyReturns the number of keys that have been deleted (long integers)$redis->delete (' Key1 ', ' key2 ');$redis->delete (Array (' Key3 ', ' key4 ', ' key5 ')); TtlGet a key to the time of survival PersistRemove key for lifetime expirationIf the key expires true if it does not expire false Mset (Redis version 1.1 or above only av

/redis-server cliexec=/usr/local/redis/bin/redis-cli PIDFILE=/var/run/ Redis_${redisport}.pid conf= "/etc/redis/${redisport}.conf" case "$" in start) if [-F $PIDFILE] t Hen echo "$PIDFILE exists, process is already running or crashed" else echo "Start ing Redis server ..

'); Delete Deletes the value of the specified keyReturns the number of keys that have been deleted (long integers)$redis->delete (' Key1 ', ' key2 ');$redis->delete (Array (' Key3 ', ' key4 ', ' key5 ')); TtlGet a key to the time of survival PersistRemove key for lifetime expirationIf the key expires true if it does not expire false Mset (Redis version 1.1 o

. The path and file name must be configured separately because Redis first writes the status of the current database to a temporary file during Backup. When the backup is complete, replace the temporary file with the file specified above, # The temporary files and the backup files configured above are stored in the specified path. Dir ./ # Master-Slave replication. Use slaveof to make a Redis instance a co

Order of 2 Zrange myzset 0-1 withscores # view all elements and sort them in ascending order by default ). Zrem myzset "two" # Delete two Zincrby myzset 2 "two" # add the two Sequence Value to 2 Zrank myzset "two" # Return the index value of the element in the set. Zrevrank myzset two # The element is reversed and a new value is returned. Zrevrange myzset 0-1 withscores # reverse in order (equivalent to descending order) Zrangebyscore myzset 1 10 withscores # returns elements in the order of 1-

the value of the specified keyReturns the number of keys that have been deleted (long integers)$redis->delete (' Key1 ', ' key2 ');$redis->delete (Array (' Key3 ', ' key4 ', ' key5 '));TtlGet a key to the time of survivalPersistRemove key for lifetime expirationIf the key expires true if it does not expire falseMset (Redis version 1.1 or above only available)Ass

persistence Master-slave settings Asynchronous replication Monitor sentpost, pass, and automatic troubleshooting Transactions Publish and subscribe to messages Automatically reclaim the least frequently used key values Automatically reclaim expired key values Script (use Lua) Basic Use Cases of Redis Redis can be used for multiple purposes. It acts as an ultra-fast distributed buffer. However, it i

preset:enabled)Active:active (running) since Fri 2018-08-10 19:50:13 CST; 36min agoDocs:http://redis.io/documentation,Man:redis-server (1)Main pid:10382 (Redis-server)Tasks:4 (limit:2294)CGroup:/system.slice/redis-server.service└─10382/usr/bin/redis-server 127.0.0.1:6379August 19:50:12 Zhangkun-virtual-machine systemd[1]: Starting Advanced key-v .....August 19:5

number of clients reached '. # limit the number of customers connected at the same time. When the number of connections exceeds this value, # redis no longer receives other connection requests, and the client will receive an error message when trying to connect # maxclients 12816. maxmemory # Don't use more memory than the specified amount of bytes. # When the memory limit is reached Redis will try to remo

,# It is best to set this item in the production environment# Bind127.0.0.1# Specify the path for the unix socket that will be used to listen#Incoming connections. There is no default, so Redis will not listen# OnUnix socket when not specified.## Unixsocket/tmp/redis. sock#Unixsocketperm 755# Set the timeout time for client connection, in seconds. When the client does not send any