springBoot是伴随着Spring4.0诞生的，于2014年4月，发布了Spring Boot 1.0.0 SpringBoot就是一个内嵌Web容器(tomcat/jetty)的可执行程序(jar)的框架。
你开发的web应用不需要作为war包部署到web容器中，而是作为一个可执行程序(jar)，启动时把web服务器配置好，加载起来。
1.大量的XML文件在项目（SpringMVC）中，配置相当繁琐
2.整合第三方框架的配置问题
3.低效的开发效率和部署效率等问题
./src/redis-server /usr/local/redis-5.0.4/redis.conf
docker create --name redis-node-1 --net host --privileged=true -v /Users/Java/files/redis-node-1:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6381
docker create --name redis-node-2 --net host --privileged=true -v /Users/Java/files/redis-node-2:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6382
docker create --name redis-node-3 --net host --privileged=true -v /Users/Java/files/redis-node-3:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6383
docker create --name redis-node-4 --net host --privileged=true -v /Users/Java/files/redis-node-4:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6384
docker create --name redis-node-5 --net host --privileged=true -v /Users/Java/files/redis-node-5:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6385
docker create --name redis-node-6 --net host --privileged=true -v /Users/Java/files/redis-node-6:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6386
docker create//创建容器的命令
--name redis-node-1 //容器的名字 例如：redis-node-1
--privileged=true //docker容器 获取数组机root权限
-v /Users/Java/files/redis-node-1:/data //容器的data目录 映射到宿主机/Users/Java/files/redis-node-1:/data
redis:5.0.7 //redis镜像名称和版本
--cluster-enabled yes //redis.conf的配置：开启redis集群
--appendonly yes //redis.conf的配置：开启数据持久化
--port 6381 //redis.conf的配置：redis端口号
docker start redis-node-1 redis-node-2 redis-node-3 redis-node-4 redis-node-5 redis-node-6
docker ps
docker exec -it redis-node-1 /bin/bash
参数create表示创建一个新的集群， --replicas 1 表示为每个master创建一个slave redis-cli --cluster create 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384 127.0.0.1:6385 127.0.0.1:6386 --cluster-replicas 1
使用docker start启动容器，进入容器内部报错could not connect
解决方案：使用docker run 绑定IP和端口
docker inspect 44de1b0b5312(容器ID)查看容器自己的内部网络和ip地址
docker run --name redis-node-1 -d -p 127.0.0.1:6381:6381 --net host --privileged=true -v /Users/Java/files/redis-node-1:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6381 docker run --name redis-node-5 -d -p 127.0.0.1:6385:6385 --net host --privileged=true -v /Users/Java/files/redis-node-5:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6385 docker run --name redis-node-6 -d -p 127.0.0.1:6386:6386 --net host --privileged=true -v /Users/Java/files/redis-node-6:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6386
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 127.0.0.1:6385 to 127.0.0.1:6381
Adding replica 127.0.0.1:6386 to 127.0.0.1:6382
Adding replica 127.0.0.1:6384 to 127.0.0.1:6383
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381
slots:[0-5460] (5461 slots) master
M: fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382
slots:[5461-10922] (5462 slots) master
M: 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383
slots:[10923-16383] (5461 slots) master
S: 90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384
replicates 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1
S: d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385
replicates ff85d991c2a6af2283f8ffe0dfb5a036975fed63
S: ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386
replicates fe25154b7deb296fafba1afefa76d438e7deb4c0
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 127.0.0.1:6381)
M: ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384
slots: (0 slots) slave
replicates 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1
M: fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386
slots: (0 slots) slave
replicates fe25154b7deb296fafba1afefa76d438e7deb4c0
M: 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385
slots: (0 slots) slave
replicates ff85d991c2a6af2283f8ffe0dfb5a036975fed63
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
redis-cli -h 127.0.0.1 -p 6381 -c
cluster info
cluster_state:ok #集群状态
cluster_slots_assigned:16384 #被分配槽的位数
cluster_slots_ok:16384 #正确分配的槽位
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6 #当前节点数
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:108
cluster_stats_messages_pong_sent:95
cluster_stats_messages_sent:203
cluster_stats_messages_ping_received:90
cluster_stats_messages_pong_received:108
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:203
cluster nodes
90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384@16384 slave 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 0 1612431689000 4 connected
ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381@16381 myself,master - 0 1612431688000 1 connected 0-5460
fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382@16382 master - 0 1612431690282 2 connected 5461-10922
ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386@16386 slave fe25154b7deb296fafba1afefa76d438e7deb4c0 0 1612431689000 6 connected
96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383@16383 master - 0 1612431691302 3 connected 10923-16383
d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385@16385 slave ff85d991c2a6af2283f8ffe0dfb5a036975fed63 0 1612431689268 5 connected
set user:100 agan
set user:200 alex
127.0.0.1:6381> set user:100 agan
-> Redirected to slot [9308] located at 127.0.0.1:6382 #落到了地9308个槽号，节点是127.0.0.1:6382
OK
127.0.0.1:6382> set user:200 alex
-> Redirected to slot [15628] located at 127.0.0.1:6383 #落到了地15628个槽号，节点是127.0.0.1:6383
OK
redis-cli --cluster check 127.0.0.1:6381
127.0.0.1:6381 (ff85d991...) -> 0 keys | 5461 slots | 1 slaves.
127.0.0.1:6382 (fe25154b...) -> 1 keys | 5462 slots | 1 slaves.
127.0.0.1:6383 (96a9b20a...) -> 1 keys | 5461 slots | 1 slaves.
[OK] 2 keys in 3 masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 127.0.0.1:6381)
M: ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384
slots: (0 slots) slave
replicates 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1
M: fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386
slots: (0 slots) slave
replicates fe25154b7deb296fafba1afefa76d438e7deb4c0
M: 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385
slots: (0 slots) slave
replicates ff85d991c2a6af2283f8ffe0dfb5a036975fed63
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
cluster nodes
90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384@16384 slave 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 0 1612432516236 4 connected
ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381@16381 myself,master - 0 1612432514000 1 connected 0-5460
fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382@16382 master - 0 1612432513000 2 connected 5461-10922
ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386@16386 slave fe25154b7deb296fafba1afefa76d438e7deb4c0 0 1612432512000 6 connected
96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383@16383 master - 0 1612432515229 3 connected 10923-16383
d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385@16385 slave ff85d991c2a6af2283f8ffe0dfb5a036975fed63 0 1612432515000 5 connected
6381是主库，6384是从库,把6381停掉
a123506ff71e redis:5.0.7 "docker-entrypoint.s…" 25 minutes ago Up 25 minutes redis-node-6
6631188196d5 redis:5.0.7 "docker-entrypoint.s…" 25 minutes ago Up 25 minutes redis-node-5
e999bc3e5934 redis:5.0.7 "docker-entrypoint.s…" 25 minutes ago Up 25 minutes redis-node-4
85d29c8a0f40 redis:5.0.7 "docker-entrypoint.s…" 27 minutes ago Up 27 minutes redis-node-3
6fb80a66c228 redis:5.0.7 "docker-entrypoint.s…" 27 minutes ago Up 27 minutes redis-node-2
edafcd8713df redis:5.0.7 "docker-entrypoint.s…" 29 minutes ago Up 29 minutes
docker stop redis-node-1
redis-node-1
再次查看节点信息
cluster nodes
fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382@16382 myself,master - 0 1612432977000 2 connected 5461-10922
90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384@16384 slave 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 0 1612432976977 4 connected
ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381@16381 master,fail - 1612432708038 1612432706000 1 disconnected
96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383@16383 master - 0 1612432975000 3 connected 10923-16383
d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385@16385 master - 0 1612432977995 8 connected 0-5460
ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386@16386 slave fe25154b7deb296fafba1afefa76d438e7deb4c0 0 1612432976000 6 connected
docker create --name redis-node-7 --net host --privileged=true -v /Users/Java/files/redis-node-7:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6387
docker create --name redis-node-8 --net host --privileged=true -v /Users/Java/files/redis-node-8:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6388
启动容器
docker run --name redis-node-7 -d -p 127.0.0.1:6387:6387 --net host --privileged=true -v /Users/Java/files/redis-node-7:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6387
docker run --name redis-node-8 -d -p 127.0.0.1:6388:6388 --net host --privileged=true -v /Users/Java/files/redis-node-8:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6388
进入节点redis-node-7容器中
docker exec -it redis-node-7 /bin/bash
redis-cli --cluster add-node 127.0.0.1:6387 127.0.0.1:6381
第一个节点代表新增的节点
第二个节点代表原集群里面的任意节点
>>> Adding node 127.0.0.1:6387 to cluster 127.0.0.1:6381 #新增节点加入到了127.0.0.1:6381集群中
>>> Performing Cluster Check (using node 127.0.0.1:6381) #先检查集群
S: ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381
slots: (0 slots) slave
replicates d60e952ba67b14922cc747c6bab0375fba5c5a8e
M: d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386
slots: (0 slots) slave
replicates fe25154b7deb296fafba1afefa76d438e7deb4c0
M: 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384
slots: (0 slots) slave
replicates 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 127.0.0.1:6387 to make it join the cluster.
[OK] New node added correctly.
redis-cli --cluster reshard 127.0.0.1:6381
新的节点加入集群，用redis-cli --cluster reshard ip:port命令来重新分配槽号
ip:port指集群中任意一个节点就行，
Performing Cluster Check (using node 127.0.0.1:6381)
S: ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381
slots: (0 slots) slave
replicates d60e952ba67b14922cc747c6bab0375fba5c5a8e
M: d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386
slots: (0 slots) slave
replicates fe25154b7deb296fafba1afefa76d438e7deb4c0
M: 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
M: 2312a968b79e2def698f711a65ed486d116aeea0 127.0.0.1:6387
slots: (0 slots) master
S: 90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384
slots: (0 slots) slave
replicates 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1
[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)? 4096 #16394/master 台数
What is the receiving node ID? 2312a968b79e2def698f711a65ed486d116aeea0
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.
redis-cli --cluster check 127.0.0.1:6378
127.0.0.1:6387 (2312a968...) -> 0 keys | 4096 slots | 0 slaves.
127.0.0.1:6383 (96a9b20a...) -> 1 keys | 4096 slots | 1 slaves.
127.0.0.1:6382 (fe25154b...) -> 1 keys | 4096 slots | 1 slaves.
127.0.0.1:6385 (d60e952b...) -> 0 keys | 4096 slots | 1 slaves.
[OK] 2 keys in 4 masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 127.0.0.1:6387)
M: 2312a968b79e2def698f711a65ed486d116aeea0 127.0.0.1:6387
slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master #为什么新加入的节点是3个区间，其他节点是单区间
S: 90187399b90b6eb719e9adfbd46b1a94b4ec2429 127.0.0.1:6384 #因为对于新加入的节点要重新分配槽号成本太大，故采用了挪移的方式。从6381 6382 6383 旧节点挪移1364个槽号给新节点
slots: (0 slots) slave
replicates 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1
S: ea598a0ffdd5fe4af99f41395ced879e66212bf2 127.0.0.1:6386
slots: (0 slots) slave
replicates fe25154b7deb296fafba1afefa76d438e7deb4c0
M: 96a9b20acd29c43c1d3c20adf0dd36a9bc82c4c1 127.0.0.1:6383 #连续单区间
slots:[12288-16383] (4096 slots) master
1 additional replica(s)
S: ff85d991c2a6af2283f8ffe0dfb5a036975fed63 127.0.0.1:6381
slots: (0 slots) slave
replicates d60e952ba67b14922cc747c6bab0375fba5c5a8e
M: fe25154b7deb296fafba1afefa76d438e7deb4c0 127.0.0.1:6382
slots:[6827-10922] (4096 slots) master
1 additional replica(s)
M: d60e952ba67b14922cc747c6bab0375fba5c5a8e 127.0.0.1:6385
slots:[1365-5460] (4096 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.