redis之集群

一.redis主从模式和redis集群模式的区别

redis主从模式:所有节点上的数据一致，但是key过多会影响性能

redis集群模式:将数据分散到多个redis节点，数据分片存储，提高了redis的吞吐量

二.redis cluster集群的特点

数据分片        多个存储入口        故障自动切换

三.redis数据存储机制

通过哈希算法将数据存储到集群中的卡槽中

四.redis cluster集群规划
三主: 192.168.145.142:7000        192.168.145.159:7001        192.168.145.160:7002
三从: 192.168.145.142:8000           192.168.145.159:8001            192.168.145.160:8002
三从保证主有问题时，及时切换
 

192.168.145.142端配置:

#创建配置文件目录
mkdir -p /data/cluster/7000
mkdir -p /data/cluster/8000
#创建配置文件......其余5个主机配置，配置文件修改端口和目录即可，其余参数一样
vim /data/cluster/7000/redis.conf
cluster-enabled yes
port 7000
dir "/data/cluster/7000" 
logfile "redis.log"
pidfile "redis.pid"
daemonize yes
bind 0.0.0.0
requirepass redispwd
masterauth redispwd
tcp-backlog 511 
tcp-keepalive 300
loglevel notice
stop-writes-on-bgsave-error yes 
rdbcompression yes
rdbchecksum yes
save 900 1
save 300 10
save 60 10000
dbfilename "dump.rdb"
slave-serve-stale-data yes  
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
appendonly yes  
appendfilename "appendonly.aof"  
appendfsync everysec
no-appendfsync-on-rewrite no  
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events g$  
hash-max-ziplist-entries 512  
hash-max-ziplist-value 64  
list-max-ziplist-entries 512  
list-max-ziplist-value 64  
set-max-intset-entries 512  
zset-max-ziplist-entries 128  
zset-max-ziplist-value 64  
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0  
client-output-buffer-limit slave 256mb 64mb 60  
client-output-buffer-limit pubsub 32mb 8mb 60