Redis Cluster集群

Redis集群

Redis集群是一个可以在多个Redis节点之间进行数据共享的设施( installation )。

Redis集群不支持那些需要同时处理多个键的Redis命令，因为执行这些命令需要在多个Redis节点之间移动数据，并且在高负载的情况下，这些命令将降低Redis集群的性能，并导致不可预测的行为。

Redis集群通过分区( partition )来提供一定程度的可用性( availability ) : 即使集群中有一部分节点失效或者无法进行通讯，集群也可以继续处理命令请求。

将数据自动切分( split) 到多个节点的能力。

当集群中的一部分节点失效或者无法进行通讯时，仍然可以继续处理命令请求的能力。

Redis集群数据共享

Redis集群使用数据分片( sharding )而非一致性哈希(consistency hashing )来实现:一个Redis集群包含16384个哈希槽( hash slot )，数据库中的每个键都属于这16384个哈希槽的其中一个，集群使用公式CRC16(key) % 16384来计算键key属于哪个槽，其中CRC16(key)语句用于计算键key的CRC16校验和。
节点A负责处理0号至5500号哈希槽。
节点B负责处理5501号至11000号哈希槽。
节点C负责处理11001号至16384号哈希槽。

集群的复制

为了使得集群在一部分节点下线或者无法与集群的大多数( majority )节点进行通讯的情况下，仍然可以正常运作，Redis 集群对节点使用了主从复制功能:集群中的每个节点都有1个至N个复制品( replica )，其中一个复制品为主节点( master ), 而其余的N-1个复制品为从节点( slave)
在之前列举的节点A、B、C的例子中，如果节点B下线了，那么集群将无法正常运行，因为集群找不到节点来处理5501号至11000号的哈希槽。
假如在创建集群的时候(或者至少在节点B下线之前)，我们为主节点B添加了从节点B1，那么当主节点B下线的时候，集群就会将 B1设置为新的主节点，并让它代替下线的主节点B，继续处理5501号至11000号的哈希槽这样集群就不会因为主节点B的下线而无法正常运作了。
不过如果节点B和B1都下线的话，Redis集群还是会停止运作。

运行机制

所有的redis节点彼此互联(PINGPONG机制)，内部使用二进制协议优化传输速度和带宽.
节点的fail（失效）是通过集群中超过半数的master节点检测失效时才生效
客户端与redis节点直连，不需要中间proxy层.客户端不需要连接集群所有节点，连接集群中任何一个可用节点即可
把所有的物理节点映射到[0-16383]slot.上,cluster负责维护node<>slot<.>key

Redis集群特性

redis cluster集群方式支持主从自动切换
redis cluster集群只有一个库，单例或者主从的话有多个库
redis cluster集群去中心化，只要通过其中一个端口连接即可
redis cluster集群，只有一个db库，不支持多库

单实例的并发QBS每秒11万次请求读写差距不大大约1W左右
单实例QBS不要超过5W 超过五万扩容集群一般3W左右 7W是极限

redis自带集群搭建，一般使用三主三从来构建（最少六台机器）。

主机名	IP	端口	用途
redis-master	192.168.50.167	7000	redis-master01
		7001	redis-master02
		7002	redis-master03
redis-slave	192.168.50.168	8000	redis-slave01
		8001	redis-slave02
		8002	redis-slave03

实验初始环境要求

systemctl stop firewalld　　　　#关防火墙和selinux
systemctl disable firewalld
setenforce 0
sestatus

redis的基础编译部署和调优

yum -y install wget gcc gcc-c++ make tar openssl openssl-devel cmake
tar xf redis-4.0.10.tar.gz -C /usr/src/
cd /usr/src/redis-4.0.10/
make
make MALLOC=jemalloc
make PREFIX=/usr/local/redis install
cd /usr/local/redis/
mkdir -p /usr/local/redis/conf
cp /usr/src/redis-4.0.10/redis.conf /usr/local/redis/conf/ 　　 #redis配置文件
cp /usr/src/redis-4.0.10/sentinel.conf /usr/local/redis/conf/  #redis哨兵配置文件
cp /usr/src/redis-4.0.10/src/redis-trib.rb /usr/local/redis/bin/   #redis-cluster的集群创建工具
ln -s /usr/local/redis/bin/* /usr/local/bin/
cp conf/redis.conf{,.bak}
egrep -v "^$|^#" conf/redis.conf.bak > conf/redis.conf
echo "* - nofile 10240" >> /etc/security/limits.conf 
echo "net.core.somaxconn = 10240" >> /etc/sysctl.conf 
echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf 
sysctl -p
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag
echo 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' >> /etc/rc.local
echo 'echo never > /sys/kernel/mm/transparent_hugepage/defrag' >> /etc/rc.local

redis主从集群多实例配置

#在redis-master上操作
mkdir -p /data/redis-cluster
cd /data/redis-cluster
mkdir -p 7000 7001 7002
#在redis-slave上操作
mkdir -p /data/redis-cluster
cd /data/redis-cluster
mkdir -p 8000 8001 8002

修改redis-master的redis.conf配置文件，模板如下所示：

#redis-master不开任何持久化配置

vim /data/redis-cluster/7000/redis.conf 

bind 0.0.0.0　　　　　　　　#连接为所有
protected-mode yes
port 7000　　　　　　　　　　#端口7000
tcp-backlog 1024
timeout 0
tcp-keepalive 0
daemonize yes　　　　　　　　#开启后端运行
supervised no
pidfile /data/redis-cluster/7000/redis.pid　　　　　　#PID文件存放位置
loglevel notice
logfile "/data/redis-cluster/7000/redis.log"　　　　　#日志文件存放位置
databases 16
always-show-logo yes
#save 900 1　　　　　　　　　　#关闭rdb快照
#save 300 10
#save 60 10000

stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /data/redis-cluster/7000/　　　　　　　　　　　　　　　#文件存放地址
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
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
slave-lazy-flush no
appendonly no　　　　　　　　　　　　　　　　　　　　#关闭aof持久化
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
aof-use-rdb-preamble no
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
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
hz 10
aof-rewrite-incremental-fsync yes
cluster-enabled yes　　　　　　　　　　　　　　#开启reids-cluster
cluster-config-file nodes.cong
cluster-node-timeout 5000


#洁净板:
bind 0.0.0.0
protected-mode yes
port 7000
tcp-backlog 1024
timeout 0
tcp-keepalive 0
daemonize yes
supervised no
pidfile /data/redis-cluster/7000/redis.pid
loglevel notice
logfile "/data/redis-cluster/7000/redis.log"
databases 16
always-show-logo yes
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /data/redis-cluster/7000/
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
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
slave-lazy-flush no
appendonly no
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
aof-use-rdb-preamble no
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
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
hz 10
aof-rewrite-incremental-fsync yes
cluster-enabled yes
cluster-config-file nodes.cong
cluster-node-timeout 5000

#master2和3配置文件只修改端口号 :%s#7000#7001#g %s#7000#7002#g

cp /data/redis-cluster/7000/redis.conf /data/redis-cluster/7001/
cp /data/redis-cluster/7000/redis.conf /data/redis-cluster/7002/

从的配置文件也用这些,如果需要开启主从复制

scp /data/redis-cluster/7000/redis.conf 192.168.50.168:/data/redis-cluster/8000/
scp /data/redis-cluster/7000/redis.conf 192.168.50.168:/data/redis-cluster/8001/
scp /data/redis-cluster/7000/redis.conf 192.168.50.168:/data/redis-cluster/8002/
#修改端口号

启动redis-master多实例

redis-server /data/redis-cluster/7001/redis.conf 
redis-server /data/redis-cluster/7002/redis.conf 
redis-server /data/redis-cluster/7000/redis.conf

编译安装高ruby版本，Ruby版本需要大于等于2.2.2（yum安装的不符合)

#redis-master和redis-slave都进行如下操作
wget --no-check-certificate 'https://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.7.tar.gz'
tar xf ruby-2.2.7.tar.gz -C /usr/src/
cd /usr/src/ruby-2.2.7/
./configure && make && make install

ruby --version
ruby 2.2.7p470 (2017-03-28 revision 58194) [x86_64-linux]

#在线安装ruby的redis扩展
/usr/local/bin/gem install redis

Fetching: redis-4.0.1.gem (100%)
Successfully installed redis-4.0.1
Parsing documentation for redis-4.0.1
Installing ri documentation for redis-4.0.1
Done installing documentation for redis after 0 seconds
1 gem installed

使用redis自带redis-trib.rb工具创建集群

#在redis-master上操作
redis-trib.rb create 192.168.50.167:7000 192.168.50.167:7001 192.168.50.167:7002

>>> Creating cluster
>>> Performing hash slots allocation on 3 nodes...
Using 3 masters:
192.168.50.167:7000
192.168.50.167:7001
192.168.50.167:7002
M: 3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000
   slots:0-5460 (5461 slots) master
M: 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001
   slots:5461-10922 (5462 slots) master
M: 7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002
   slots:10923-16383 (5461 slots) master
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join..
>>> Performing Cluster Check (using node 192.168.50.167:7000)
M: 3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000
   slots:0-5460 (5461 slots) master
   0 additional replica(s)
M: 7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002
   slots:10923-16383 (5461 slots) master
   0 additional replica(s)
M: 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001
   slots:5461-10922 (5462 slots) master
   0 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.                       #两个OK表示成功

查看集群的信息

redis-cli -p 7000 cluster nodes
625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001@17001 master - 0 1535108491650 2 connected 5461-10922
3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000@17000 myself,master - 0 1535108491000 5 connected 0-5460
7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002@17002 master - 0 1535108490543 3 connected 10923-16383

ls /data/redis-cluster/7000/　　　　　　　　　　
dump.rdb  nodes.cong  redis.conf  redis.log  redis.pid

cat /data/redis-cluster/7000/nodes.cong　　　　　　　　　　#信息保存在nodes.cong里
625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001@17001 master - 0 1535108491650 2 connected 5461-10922
3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000@17000 myself,master - 0 1535108491000 5 connected 0-5460
7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002@17002 master - 0 1535108490543 3 connected 10923-16383

使用redis-cli去操作集群，需要加入-c参数

redis-cli -c -p 7000　　　　　　　　#随便进入一个redis端口就可操作整个redis

cluster集群的重建

#删除cluster集群配置文件
rm -rf /data/redis-cluster/7000/nodes.cong
rm -rf /data/redis-cluster/7001/nodes.cong
rm -rf /data/redis-cluster/7002/nodes.cong

#删除cluster集群配置文件
redis-cli -p 7000 shutdown
redis-cli -p 7001 shutdown
redis-cli -p 7002 shutdown

#启动redis-server
redis-server /data/redis-cluster/7000/redis.conf 
redis-server /data/redis-cluster/7001/redis.conf 
redis-server /data/redis-cluster/7002/redis.conf

#重新创建redis-cluster集群
redis-trib.rb create 192.168.50.167:7000 192.168.50.167:7001 192.168.50.167:7002

ps -ef | grep cluster | grep -v grep
root      31952      1  0 22:32 ?        00:00:00 redis-server 0.0.0.0:7000 [cluster]
root      31957      1  0 22:32 ?        00:00:00 redis-server 0.0.0.0:7001 [cluster]
root      31962      1  0 22:32 ?        00:00:00 redis-server 0.0.0.0:7002 [cluster]

Redis Cluster集群的故障自动切换

启动redis-slave上所有的从库

redis-server /data/redis-cluster/8000/redis.conf 
redis-server /data/redis-cluster/8001/redis.conf 
redis-server /data/redis-cluster/8002/redis.conf 

netstat -antup | grep redis
tcp        0      0 0.0.0.0:8000            0.0.0.0:*               LISTEN      51680/redis-server  
tcp        0      0 0.0.0.0:8001            0.0.0.0:*               LISTEN      51685/redis-server  
tcp        0      0 0.0.0.0:8002            0.0.0.0:*               LISTEN      51690/redis-server  
tcp        0      0 0.0.0.0:18000           0.0.0.0:*               LISTEN      51680/redis-server  
tcp        0      0 0.0.0.0:18001           0.0.0.0:*               LISTEN      51685/redis-server  
tcp        0      0 0.0.0.0:18002           0.0.0.0:*               LISTEN      51690/redis-server

redis-cluster集群从库的添加

redis-trib.rb add-node --slave 192.168.50.168:8000 192.168.50.167:7000　　　　　　　　　　#添加第一个从8000对应的主为7000
>>> Adding node 192.168.50.168:8000 to cluster 192.168.50.167:7000
>>> Performing Cluster Check (using node 192.168.50.167:7000)
M: 3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000
   slots:0-5460 (5461 slots) master
   0 additional replica(s)
M: 7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002
   slots:10923-16383 (5461 slots) master
   0 additional replica(s)
M: 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001
   slots:5461-10922 (5462 slots) master
   0 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
Automatically selected master 192.168.50.167:7000
>>> Send CLUSTER MEET to node 192.168.50.168:8000 to make it join the cluster.
Waiting for the cluster to join....
>>> Configure node as replica of 192.168.50.167:7000.
[OK] New node added correctly.

redis-trib.rb add-node --slave 192.168.50.168:8001 192.168.50.167:7001　　　　　　　　　　　　#添加第二个从8001对应的7001
>>> Adding node 192.168.50.168:8001 to cluster 192.168.50.167:7001
>>> Performing Cluster Check (using node 192.168.50.167:7001)
M: 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001
   slots:5461-10922 (5462 slots) master
   0 additional replica(s)
S: 7a0f3052b2474b9080f0df1a3df562461ac94d30 192.168.50.168:8000
   slots: (0 slots) slave
   replicates 3f5ff40741abf362e2dad0b26c1ef817e98b3428
M: 7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002
   slots:10923-16383 (5461 slots) master
   0 additional replica(s)
M: 3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
Automatically selected master 192.168.50.167:7001
>>> Send CLUSTER MEET to node 192.168.50.168:8001 to make it join the cluster.
Waiting for the cluster to join.
>>> Configure node as replica of 192.168.50.167:7001.
[OK] New node added correctly.

redis-trib.rb add-node --slave 192.168.50.168:8002 192.168.50.167:7002　　　　　　　　　　　　　　　　#第三个添加的从8002对应的主7002
>>> Adding node 192.168.50.168:8002 to cluster 192.168.50.167:7002
>>> Performing Cluster Check (using node 192.168.50.167:7002)
M: 7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002
   slots:10923-16383 (5461 slots) master
   0 additional replica(s)
S: 45f40c58756d690a6a687dca283a0274e4d1d0f3 192.168.50.168:8001
   slots: (0 slots) slave
   replicates 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb
M: 3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
M: 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 7a0f3052b2474b9080f0df1a3df562461ac94d30 192.168.50.168:8000
   slots: (0 slots) slave
   replicates 3f5ff40741abf362e2dad0b26c1ef817e98b3428
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
Automatically selected master 192.168.50.167:7002
>>> Send CLUSTER MEET to node 192.168.50.168:8002 to make it join the cluster.
Waiting for the cluster to join.
>>> Configure node as replica of 192.168.50.167:7002.
[OK] New node added correctly.

查看集群所有节点的信息

redis-cli -p 7000 cluster nodes
45f40c58756d690a6a687dca283a0274e4d1d0f3 192.168.50.168:8001@18001 slave 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 0 1535109423735 2 connected
625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001@17001 master - 0 1535109423535 2 connected 5461-10922
3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000@17000 myself,master - 0 1535109424000 5 connected 0-5460
eaa15a35898137b02087581f2e910d18e0d7cecf 192.168.50.168:8002@18002 slave 7a5ed824f23ca900917bec79c14507377c61506e 0 1535109424747 3 connected
7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002@17002 master - 0 1535109424239 3 connected 10923-16383
7a0f3052b2474b9080f0df1a3df562461ac94d30 192.168.50.168:8000@18000 slave 3f5ff40741abf362e2dad0b26c1ef817e98b3428 0 1535109422730 5 connected

redis的cluster集群，不论是主库还是从库都可以进行set和get。因此，在使用中我们就没必要都去主库了。

查看主从cluster集群key的分布情况

redis-cli -h 192.168.50.168 -c -p 8002 info Keyspace
# Keyspace
db0:keys=6,expires=0,avg_ttl=0

redis集群的主从自动切换，主库挂掉后，从自动变为主

手动切换主从命令cluster failover

redis-cli -p 7000 shutdown　　　　　　#手动宕掉主1
redis-cli -p 7001 cluster nodes　　　　#查看状态
eaa15a35898137b02087581f2e910d18e0d7cecf 192.168.50.168:8002@18002 slave 7a5ed824f23ca900917bec79c14507377c61506e 0 1535102657000 3 connected
45f40c58756d690a6a687dca283a0274e4d1d0f3 192.168.50.168:8001@18001 slave 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 0 1535102656525 2 connected
3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000@17000 master,fail - 1535102650269 1535102648861 1 disconnected　　　　#7000挂掉了
7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002@17002 master - 0 1535102656000 3 connected 10923-16383
625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001@17001 myself,master - 0 1535102656000 2 connected 5461-10922
7a0f3052b2474b9080f0df1a3df562461ac94d30 192.168.50.168:8000@18000 master - 0 1535102657000 4 connected 0-5460　　　　　　#8000成为了master
#重新启动7000端口的server，再次查看
redis-server /data/redis-cluster/7000/redis.conf
redis-cli -p 7001 cluster nodes
eaa15a35898137b02087581f2e910d18e0d7cecf 192.168.50.168:8002@18002 slave 7a5ed824f23ca900917bec79c14507377c61506e 0 1535102793234 3 connected
45f40c58756d690a6a687dca283a0274e4d1d0f3 192.168.50.168:8001@18001 slave 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 0 1535102792225 2 connected
3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000@17000 slave 7a0f3052b2474b9080f0df1a3df562461ac94d30 0 1535102791718 4 connected
7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002@17002 master - 0 1535102792728 3 connected 10923-16383
625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001@17001 myself,master - 0 1535102792000 2 connected 5461-10922
7a0f3052b2474b9080f0df1a3df562461ac94d30 192.168.50.168:8000@18000 master - 0 1535102792000 4 connected 0-5460
#手动将redis-server 7000端口重新切换成主库
redis-cli -p 7000 cluster failover
redis-cli -p 7001 cluster nodes
eaa15a35898137b02087581f2e910d18e0d7cecf 192.168.50.168:8002@18002 slave 7a5ed824f23ca900917bec79c14507377c61506e 0 1535102934425 3 connected
45f40c58756d690a6a687dca283a0274e4d1d0f3 192.168.50.168:8001@18001 slave 625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 0 1535102934526 2 connected
3f5ff40741abf362e2dad0b26c1ef817e98b3428 192.168.50.167:7000@17000 master - 0 1535102934000 5 connected 0-5460
7a5ed824f23ca900917bec79c14507377c61506e 192.168.50.167:7002@17002 master - 0 1535102933418 3 connected 10923-16383
625e0520c9dd87f0eaf28549daa0ee3f8f39ecbb 192.168.50.167:7001@17001 myself,master - 0 1535102934000 2 connected 5461-10922
7a0f3052b2474b9080f0df1a3df562461ac94d30 192.168.50.168:8000@18000 slave 3f5ff40741abf362e2dad0b26c1ef817e98b3428 0 1535102933000 5 connected

使用Python操作Redis Cluster集群

yum -y install epel-release
yum -y install python2-pip
pip install redis-py-cluster
操作集群的代码
pwd
/server/scripts
cat redis_cluster.py 
# -*- coding:utf-8 -*-
from rediscluster import StrictRedisCluster
redis_nodes = [
        {'host':'192.168.200.231','port':7000},
        {'host':'192.168.200.231','port':7001},
        {'host':'192.168.200.231','port':7002},
        {'host':'192.168.200.232','port':8000},
        {'host':'192.168.200.232','port':8001},
        {'host':'192.168.200.232','port':8002}
        ]
redis_conn = StrictRedisCluster(startup_nodes=redis_nodes)
redis_conn.set('key_test','values_test')
print(redis_conn.get('key_test'))
[root@redis-master scripts]# python redis_cluster.py 
values_test
[root@redis-master scripts]# redis-cli -c -p 7002 get key_test
"values_test"
特别提示： 
若其中一个节点挂了，不影响功能的使用

分析Redis的所有key和key的大小

pip安装rdbtools分析工具

[root@redis-master ~]# pip install rdbtools
[root@redis-master ~]# which rdb
/usr/bin/rdb

分析key及key的大小

运维需求，根据dump.rdb文件分析key和key的大小
rdb -c memory /data/redis-cluster/7000/dump.rdb > /root/memory.csv
cat /root/memory.csv | head

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原文地址：https://www.cnblogs.com/xiaoleiel/p/11160899.html