REDIS学习总结（一）单机集群搭建
一、概述
  单机集群搭建实践
    思考问题一：六节点实现三主三从-减少一个节点会发生什么？
    思考问题二：如何实现动态增减redis节点？
二、redis单机集群搭建实践
  1.下载redis https://redis.io/download或http://www.redis.cn/download.html（当前版本5.0.3）redis-5.0.3.tar.gz
  2.解压redis （下载到路径 /usr/local/redis/）
    [root@localhost redis]# tar -zxvf redis-5.0.3.tar.gz
  3.安装编译依赖
    yum install gcc
  4.编译redis
    [root@localhost redis]# cd redis-5.0.3/
    [root@localhost redis-5.0.3]# make MALLOC=libc
    [root@localhost redis-5.0.3]# cd src && make install
  5.控制台启动redis
    [root@localhost src]# ./redis-server
  以上完成redis的简单单机、单实例安装与启动，下面完成redis的单机集群安装与测试
  6.创建redis集群文件夹
    [root@localhost src]# mkdir -p /usr/local/redis-cluster
    [root@localhost redis-cluster]# mkdir 27001
    [root@localhost redis-cluster]# mkdir 27002
    [root@localhost redis-cluster]# mkdir 27003
    [root@localhost redis-cluster]# mkdir 27004
    [root@localhost redis-cluster]# mkdir 27005
    [root@localhost redis-cluster]# mkdir 27006
  7.在27001~27006中放入配置文件redis.conf
    初步实现集群，将元redis.conf的注释删除了，剩下的配置中需要改的地方：
    port、dir、节点配置参数、节点进程文件

bind 192.168.31.132
protected-mode yesport 27005
tcp-backlog 511
timeout 0
tcp-keepalive 300daemonize yes
supervised nopidfile /var/run/redis_27005.pid
loglevel notice
logfile ""
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdbdir /usr/local/redis-cluster/27005/
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
replica-priority 100
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush noappendonly yesappendfilename "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 yes
lua-time-limit 5000cluster-enabled yescluster-config-file nodes-27005.conf
cluster-node-timeout 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
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes

8.编写启动文件
    cd /usr/local/redis-cluster
    vim start-cluster.sh
    输入：

#! /bin/bash
/usr/local/redis/redis-5.0.3/src/redis-server /usr/local/redis-cluster/27001/redis.conf
/usr/local/redis/redis-5.0.3/src/redis-server /usr/local/redis-cluster/27002/redis.conf
/usr/local/redis/redis-5.0.3/src/redis-server /usr/local/redis-cluster/27003/redis.conf
/usr/local/redis/redis-5.0.3/src/redis-server /usr/local/redis-cluster/27004/redis.conf
/usr/local/redis/redis-5.0.3/src/redis-server /usr/local/redis-cluster/27005/redis.conf
/usr/local/redis/redis-5.0.3/src/redis-server /usr/local/redis-cluster/27006/redis.conf

Esc :wq Enter

start-cluster.sh
  9.创建集群（只需第一次）

cp /usr/local/redis/redis-5.0.3/src/redis-cli /usr/local/redis-cluster/
cd /usr/local/redis-cluster
redis-cli --cluster create 192.168.31.132:27001 192.168.31.132:27002 192.168.31.132:27003 192.168.31.132:27004 192.168.31.132:27005 192.168.31.132:27006 --cluster-replicas 1

10.检查集群状态
    # -c:操作集群 -h:ip -p任意节点的port
    [root@localhost redis-cluster]# redis-cli -c -h 192.168.31.132 -p 27006
    192.168.31.132:27006> CLUSTER NODES

f1bc208e60311a374cd5c34cabb1a52cb518241a 192.168.31.132:27005@37005 master - 0 1547915984000 7 connected 0-5460
068acabd33e02684ad9f8b2dbdef0e30508853aa 192.168.31.132:27004@37004 slave b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 0 1547915984000 4 connected
67878d35ba5ed57ec4f788195189f7f86aa6b6fb 192.168.31.132:27002@37002 master - 0 1547915983814 2 connected 5461-10922
3edebeb75eb348ca7ff87ff5eb328f2bd71c2a4f 192.168.31.132:27001@37001 slave f1bc208e60311a374cd5c34cabb1a52cb518241a 0 1547915983511 7 connected
da1e20037f6c41ca45fd5af9f2a479475fc82cf8 192.168.31.132:27006@37006 myself,slave 67878d35ba5ed57ec4f788195189f7f86aa6b6fb 0 1547915983000 6 connected
b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 192.168.31.132:27003@37003 master - 0 1547915984826 3 connected 10923-16383

可以发现创建了三主三从的redis集群 
三、问题解答
    思考问题一：六节点实现三主三从-减少一个节点会发生什么？
      [root@localhost redis-cluster]# ./redis-cli -c -h 192.168.31.132 -p 27002
      192.168.31.132:27002> CLUSTER NODES

67878d35ba5ed57ec4f788195189f7f86aa6b6fb 192.168.31.132:27002@37002 myself,master - 0 1547975761000 2 connected 5461-10922
b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 192.168.31.132:27003@37003 master - 0 1547975761066 3 connected 10923-16383
068acabd33e02684ad9f8b2dbdef0e30508853aa 192.168.31.132:27004@37004 slave b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 0 1547975760061 4 connected
3edebeb75eb348ca7ff87ff5eb328f2bd71c2a4f 192.168.31.132:27001@37001 slave f1bc208e60311a374cd5c34cabb1a52cb518241a 0 1547975760000 7 connected
f1bc208e60311a374cd5c34cabb1a52cb518241a 192.168.31.132:27005@37005 master - 0 1547975761167 7 connected 0-5460
da1e20037f6c41ca45fd5af9f2a479475fc82cf8 192.168.31.132:27006@37006 slave 67878d35ba5ed57ec4f788195189f7f86aa6b6fb 0 1547975761568 6 connected

可以看出关系 - 
    主：192.168.31.132:27002  192.168.31.132:27003  192.168.31.132:27005
    从：192.168.31.132:27006  192.168.31.132:27004  192.168.31.132:27001
      现在减少主节点192.168.31.132:27002 - 
      192.168.31.132:27002> SHUTDOWN
      not connected> quit
      [root@localhost redis-cluster]# ./redis-cli -c -h 192.168.31.132 -p 27003
      192.168.31.132:27003> CLUSTER NODES

068acabd33e02684ad9f8b2dbdef0e30508853aa 192.168.31.132:27004@37004 slave b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 0 1547976083802 4 connected
da1e20037f6c41ca45fd5af9f2a479475fc82cf8 192.168.31.132:27006@37006 master - 0 1547976082592 8 connected 5461-10922
f1bc208e60311a374cd5c34cabb1a52cb518241a 192.168.31.132:27005@37005 master - 0 1547976083600 7 connected 0-5460
3edebeb75eb348ca7ff87ff5eb328f2bd71c2a4f 192.168.31.132:27001@37001 slave f1bc208e60311a374cd5c34cabb1a52cb518241a 0 1547976083000 7 connected
67878d35ba5ed57ec4f788195189f7f86aa6b6fb 192.168.31.132:27002@37002 master,fail - 1547976058636 1547976058535 2 disconnected
b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 192.168.31.132:27003@37003 myself,master - 0 1547976083000 3 connected 10923-16383

可以看出关系 - 
    主：192.168.31.132:27003  192.168.31.132:27005  192.168.31.132:27006
    从：192.168.31.132:27004  192.168.31.132:27001
    当删除主节点192.168.31.132:27002时，192.168.31.132:27006从节点变成主节点且slots->[5461,10922]正常工作
    思考问题二：如何实现动态增减redis节点？（水平扩容）
    例：新增节点：192.168.31.132:27007、192.168.31.132:27008
    [root@localhost redis-cluster]# mkdir 27007
    [root@localhost redis-cluster]# mkdir 27008

bind 192.168.31.132
protected-mode yesport 27007
tcp-backlog 511
timeout 0
tcp-keepalive 300daemonize yes
supervised nopidfile /var/run/redis_27007.pid
loglevel notice
logfile ""
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdbdir /usr/local/redis-cluster/27007/
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
replica-priority 100
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush noappendonly 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
aof-use-rdb-preamble yes
lua-time-limit 5000
cluster-enabled yes
cluster-config-file nodes-27007.conf
cluster-node-timeout 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
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes

1.动态增加主节点（192.168.31.132:27007）
      启动192.168.31.132:27007 redis节点：
      /usr/local/redis/redis-5.0.3/src/redis-server /usr/local/redis-cluster/27007/redis.conf
      将节点加入集群：
      redis-cli --cluster add-node 192.168.31.132:27007 192.168.31.132:27004
      给新加入的节点分配slots
      [root@localhost redis-cluster]# redis-cli -c reshard 192.168.31.132:27005
      Could not connect to Redis at 127.0.0.1:6379: Connection refused
      [root@localhost redis-cluster]# vi /usr/local/redis/redis-5.0.3/redis.conf
      [root@localhost redis-cluster]# redis-cli -c reshard 192.168.31.132:27005
      Could not connect to Redis at 127.0.0.1:6379: Connection refused
      [root@localhost redis-cluster]# vi /usr/local/redis/redis-5.0.3/redis.conf
      [root@localhost redis-cluster]# ./redis-cli --cluster  reshard 192.168.31.132:27005

>>> Performing Cluster Check (using node 192.168.31.132:27005)
M: f1bc208e60311a374cd5c34cabb1a52cb518241a 192.168.31.132:27005slots:[0-5460] (5461 slots) master1 additional replica(s)
M: da1e20037f6c41ca45fd5af9f2a479475fc82cf8 192.168.31.132:27006slots:[5461-10922] (5462 slots) master
S: 068acabd33e02684ad9f8b2dbdef0e30508853aa 192.168.31.132:27004slots: (0 slots) slavereplicates b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b
M: b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 192.168.31.132:27003slots:[10923-16383] (5461 slots) master1 additional replica(s)
S: 3edebeb75eb348ca7ff87ff5eb328f2bd71c2a4f 192.168.31.132:27001slots: (0 slots) slavereplicates f1bc208e60311a374cd5c34cabb1a52cb518241a
M: 9e8621c944181141793bb6218971220dce19a15f 192.168.31.132:27007slots: (0 slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 4000
What is the receiving node ID? 9e8621c944181141793bb6218971220dce19a15f
Please enter all the source node IDs.Type 'all' to use all the nodes as source nodes for the hash slots.Type 'done' once you entered all the source nodes IDs.
Source node #1: f1bc208e60311a374cd5c34cabb1a52cb518241a
Source node #2: da1e20037f6c41ca45fd5af9f2a479475fc82cf8
Source node #3: b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b
Source node #4: doneReady to move 4000 slots.Source nodes:M: f1bc208e60311a374cd5c34cabb1a52cb518241a 192.168.31.132:27005slots:[0-5460] (5461 slots) master1 additional replica(s)M: da1e20037f6c41ca45fd5af9f2a479475fc82cf8 192.168.31.132:27006slots:[5461-10922] (5462 slots) masterM: b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 192.168.31.132:27003slots:[10923-16383] (5461 slots) master1 additional replica(s)Destination node:M: 9e8621c944181141793bb6218971220dce19a15f 192.168.31.132:27007slots: (0 slots) masterResharding plan:Moving slot 5461 from da1e20037f6c41ca45fd5af9f2a479475fc82cf8Moving slot 5462 from da1e20037f6c41ca45fd5af9f2a479475fc82cf8......

2.动态增加从节点（192.168.31.132:27008）

bind 192.168.31.132
protected-mode yesport 27008
tcp-backlog 511
timeout 0
tcp-keepalive 300daemonize yes
supervised nopidfile /var/run/redis_27008.pid
loglevel notice
logfile ""
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdbdir /usr/local/redis-cluster/27008/
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
replica-priority 100
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush noappendonly 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
aof-use-rdb-preamble yes
lua-time-limit 5000
cluster-enabled yes
cluster-config-file nodes-27008.conf
cluster-node-timeout 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
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes

启动192.168.31.132:27008 redis节点：
      /usr/local/redis/redis-5.0.3/src/redis-server /usr/local/redis-cluster/27008/redis.conf
      将节点加入集群：
      redis-cli --cluster add-node 192.168.31.132:27008 192.168.31.132:27004
      [root@localhost redis-cluster]# redis-cli add-node --slave 192.168.31.132:27008 192.168.31.132:27006
      Could not connect to Redis at 127.0.0.1:6379: Connection refused
      [root@localhost redis-cluster]# redis-cli --cluster add-node --slave 192.168.31.132:27008 192.168.31.132:27006

>>> Adding node 192.168.31.132:27008 to cluster 192.168.31.132:27006
>>> Performing Cluster Check (using node 192.168.31.132:27006)
M: da1e20037f6c41ca45fd5af9f2a479475fc82cf8 192.168.31.132:27006slots:[6795-10922] (4128 slots) master
M: f1bc208e60311a374cd5c34cabb1a52cb518241a 192.168.31.132:27005slots:[1333-5460] (4128 slots) master1 additional replica(s)
M: 9e8621c944181141793bb6218971220dce19a15f 192.168.31.132:27007slots:[0-1332],[5461-6794],[10923-12255] (4000 slots) master1 additional replica(s)
S: 068acabd33e02684ad9f8b2dbdef0e30508853aa 192.168.31.132:27004slots: (0 slots) slavereplicates b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b
S: 67878d35ba5ed57ec4f788195189f7f86aa6b6fb 192.168.31.132:27002slots: (0 slots) slavereplicates 9e8621c944181141793bb6218971220dce19a15f
S: 3edebeb75eb348ca7ff87ff5eb328f2bd71c2a4f 192.168.31.132:27001slots: (0 slots) slavereplicates f1bc208e60311a374cd5c34cabb1a52cb518241a
M: b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 192.168.31.132:27003slots:[12256-16383] (4128 slots) master1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 192.168.31.132:27008 to make it join the cluster.
[OK] New node added correctly.
[root@localhost redis-cluster]# redis-cli -c -h 192.168.31.132 -p 27008
192.168.31.132:27008> CLUSTER NODES
b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 192.168.31.132:27003@37003 master - 0 1547984011896 3 connected 12256-16383
989a8fed9f974878685b208e79e8ce3cd1ada4bd 192.168.31.132:27008@37008 myself,master - 0 1547984011000 0 connected
67878d35ba5ed57ec4f788195189f7f86aa6b6fb 192.168.31.132:27002@37002 slave 9e8621c944181141793bb6218971220dce19a15f 0 1547984011594 9 connected
da1e20037f6c41ca45fd5af9f2a479475fc82cf8 192.168.31.132:27006@37006 master - 0 1547984011594 8 connected 6795-10922
9e8621c944181141793bb6218971220dce19a15f 192.168.31.132:27007@37007 master - 0 1547984011594 9 connected 0-1332 5461-6794 10923-12255
3edebeb75eb348ca7ff87ff5eb328f2bd71c2a4f 192.168.31.132:27001@37001 slave f1bc208e60311a374cd5c34cabb1a52cb518241a 0 1547984010388 7 connected
068acabd33e02684ad9f8b2dbdef0e30508853aa 192.168.31.132:27004@37004 slave b7e3fae2b3e87c54c42e20d416a1761d6dd81c8b 0 1547984011394 3 connected
f1bc208e60311a374cd5c34cabb1a52cb518241a 192.168.31.132:27005@37005 master - 0 1547984010085 7 connected 1333-5460
192.168.31.132:27008> CLUSTER REPLICATE da1e20037f6c41ca45fd5af9f2a479475fc82cf8
OK

四、参考文献
  redis 5.0.3 讲解、集群搭建 https://www.cnblogs.com/zy-303/p/10273167.html
  redis搭建集群ERROR: Could not find a valid gem 'redis-3.0.0' (>= 0) in any repository https://blog.csdn.net/qqxyy99/article/details/78962846
  redis cli命令 https://www.cnblogs.com/kongzhongqijing/p/6867960.html

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