Redis 3.0的集群功能很强大了， 最大的特点就是有了cluster的能力，使用redis-trib.rb工具可以轻松构建Redis Cluster。Redis Cluster采用无中心结构，每个节点保存数据和整个集群状态,每个节点都和其他所有节点连接。节点之间使用gossip协议传播信息以及发现新节点。其具体的原理请看官方文档，这里只是记录一下实验的过程。以便更好的了解集群的特性。
#安装依赖软件：
yum install gcc rubyzlib rubygems
wgethttps://rubygems.org/downloads/redis-3.2.2.gem
gem installredis-3.2.2.gem
#版本：redis-3.2
#架构信息
192.168.100.41 master：6379 slave：7379
192.168.100.42 master：6379 slave：7379
192.168.100.43 master：6379 slave：7379
#通用配置：
more /usr/local/redis-3.2/conf/redis-common.conf
#GENERAL
daemonize yes
tcp-backlog 511
timeout 0
tcp-keepalive 0
loglevel notice
databases 16
dir /usr/local/redis-3.2/{data,data_7379}
slave-serve-stale-data yes
slave-read-only yes
#not use default
repl-disable-tcp-nodelay yes
slave-priority 100
appendonly yes
appendfsync everysec
no-appendfsync-on-rewrite yes
auto-aof-rewrite-min-size 64mb
lua-time-limit 5000
cluster-enabled yes
cluster-node-timeout 15000
cluster-migration-barrier 1
slowlog-log-slower-than 10000
slowlog-max-len 128
notify-keyspace-events ""
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
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
#独立端口配置：{6379,7379}
more /usr/local/redis-3.2/conf/redis-{6379,7379}.conf
include/usr/local/redis-3.2/conf/redis-{common,common_7379}.conf
port {6379,7379}
logfile"/usr/local/redis-3.2/logs/redis-{6379,7379}.log"
maxmemory 100m
# volatile-lru -> remove the key with an expire set usingan LRU algorithm
# allkeys-lru -> remove any key accordingly to the LRUalgorithm
# volatile-random -> remove a random key with an expireset
# allkeys-random -> remove a random key, any key
# volatile-ttl -> remove the key with the nearest expiretime (minor TTL)
# noeviction -> don't expire at all, just return an erroron write operations
maxmemory-policy allkeys-lru
appendfilename "appendonly-{6379,7379}.aof"
dbfilename dump-{6379,7379}.rdb
cluster-config-file nodes-{6379,7379}.conf
auto-aof-rewrite-percentage 80-100
bind 192.168.100.{41,42,43}
#启动进程
/usr/local/redis-3.2/bin/redis-server/usr/local/redis-3.2/conf/redis-{6379,7379}.conf
#创建集群
/usr/local/redis-3.2/bin/redis-trib.rb create --replicas 1192.168.100.41:6379 192.168.100.42:6379 192.168.100.43:6379 192.168.100.41:7379192.168.100.42:7379
192.168.100.43:7379
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.100.43:6379
192.168.100.42:6379
192.168.100.41:6379
Adding replica 192.168.100.42:7379 to 192.168.100.43:6379
Adding replica 192.168.100.41:7379 to 192.168.100.42:6379
Adding replica 192.168.100.42:7379 to 192.168.100.41:6379
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd 192.168.100.41:6379
slots:10923-16383(5461 slots) master
M: 35fc4a46cfe68e941a18ca33e574df86db7beefb192.168.100.42:6379
slots:5461-10922(5462 slots) master
M: 2ef9b515fac6159b37520afce1f75b38ba1e9a87192.168.100.43:6379
slots:0-5460 (5461slots) master
S: 6a2d10792f17985d1e30e9e20fe92c890748487f192.168.100.41:7379
replicates35fc4a46cfe68e941a18ca33e574df86db7beefb
S: eb921729e82925c6be859185efb58e77b49e7a89192.168.100.42:7379
replicates2ef9b515fac6159b37520afce1f75b38ba1e9a87
S: eb921729e82925c6be859185efb58e77b49e7a89192.168.100.42:7379
replicatesc2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
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 thecluster
Waiting for the cluster to join.
>>> Performing Cluster Check (using node192.168.100.41:6379)
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd192.168.100.41:6379
slots:10923-16383(5461 slots) master
M: 35fc4a46cfe68e941a18ca33e574df86db7beefb192.168.100.42:6379
slots:5461-10922(5462 slots) master
M: 2ef9b515fac6159b37520afce1f75b38ba1e9a87192.168.100.43:6379
slots:0-5460 (5461slots) master
M: 6a2d10792f17985d1e30e9e20fe92c890748487f 192.168.100.41:7379
slots: (0 slots)master
replicates35fc4a46cfe68e941a18ca33e574df86db7beefb
M: eb921729e82925c6be859185efb58e77b49e7a89192.168.100.42:7379
slots: (0 slots)master
replicates2ef9b515fac6159b37520afce1f75b38ba1e9a87
M: eb921729e82925c6be859185efb58e77b49e7a89192.168.100.42:7379
slots: (0 slots)master
replicatesc2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
#添加节点
master:192.168.100.41:8379 slave:192.168.100.42:8379 slave:192.168.100.43:8379
创建相关配置文件和数据目录同上述配置更改端口信息即可
#节点准备就绪
salt '*' cmd.run ' ps aux |grep redis-server|grep -v grep'
client.wboy.com:
root 13452 0.0 0.7 36684 7716 ? Ssl 11:20 0:13 /usr/local/redis-3.2/bin/redis-server 192.168.100.42:7379 [cluster]
root 13462 0.1 0.9 38732 9756 ? Ssl 11:20 0:21 /usr/local/redis-3.2/bin/redis-server 192.168.100.42:6379 [cluster]
root 16566 0.0 0.7 36684 7560 ? Ssl 16:02 0:00 /usr/local/redis-3.2/bin/redis-server 192.168.100.42:8379 [cluster]
master.weiboyi.com:
root 3991 0.1 0.5 40780 9800 ? Ssl 11:20 0:22 /usr/local/redis-3.2/bin/redis-server 192.168.100.41:6379[cluster]
root 4324 0.0 0.4 133520 7720 ? Ssl 11:27 0:12 /usr/local/redis-3.2/bin/redis-server192.168.100.41:7379 [cluster]
root 16347 0.0 0.3 36684 7560 ? Ssl 16:02 0:00/usr/local/redis-3.2/bin/redis-server 192.168.100.41:8379 [cluster]
client1.weiboyi.com:
root 10014 0.1 0.3 36684 7736 ? Ssl 12:19 0:31 /usr/local/redis-3.2/bin/redis-server 192.168.100.43:7379 [cluster]
root 10027 0.2 0.4 38732 9788 ? Ssl 12:20 0:39 /usr/local/redis-3.2/bin/redis-server 192.168.100.43:6379 [cluster]
root 13153 0.0 0.3 36684 7564 ? Ssl 17:02 0:00 /usr/local/redis-3.2/bin/redis-server 192.168.100.43:8379 [cluster]
#先检查一下节点的信息状态等
/usr/local/redis-3.2/bin/redis-trib.rb check192.168.100.41:7379
>>> Performing Cluster Check (using node192.168.100.41:7379)
S: 589ff9053237d77131f4cc6f6cf0006b3e38ea56192.168.100.41:7379
slots: (0 slots)slave
replicatesc2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd192.168.100.41:6379
slots:9223-16383(7161 slots) master
1 additionalreplica(s)
M: c10928731b4563ec3aa7a60c6837ee77b8b0f95a 192.168.100.43:6379
slots:0-1879,5461-9222 (5642 slots) master
1 additionalreplica(s)
S: dba4b4dca703cd2776e2771f8805139a2beaa306192.168.100.43:7379
slots: (0 slots)slave
replicatesc10928731b4563ec3aa7a60c6837ee77b8b0f95a
M: 389e7e2fa0a4fb494f6ecb854a677d04e6ed79af192.168.100.42:6379
slots:1880-5460(3581 slots) master
1 additionalreplica(s)
S: fec421bd36ad2730864d520240c77248494881cd192.168.100.42:7379
slots: (0 slots)slave
replicates389e7e2fa0a4fb494f6ecb854a677d04e6ed79af
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
#加入节点
/usr/local/redis-3.2/bin/redis-trib.rb add-node192.168.100.41:8379 192.168.100.41:7379
>>> Adding node 192.168.100.41:8379 to cluster192.168.100.41:7379
>>> Performing Cluster Check (using node192.168.100.41:7379)
S: 589ff9053237d77131f4cc6f6cf0006b3e38ea56192.168.100.41:7379
slots: (0 slots)slave
replicatesc2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd192.168.100.41:6379
slots:9223-16383(7161 slots) master
1 additionalreplica(s)
M: c10928731b4563ec3aa7a60c6837ee77b8b0f95a192.168.100.43:6379
slots:0-1879,5461-9222(5642 slots) master
1 additionalreplica(s)
S: dba4b4dca703cd2776e2771f8805139a2beaa306192.168.100.43:7379
slots: (0 slots)slave
replicatesc10928731b4563ec3aa7a60c6837ee77b8b0f95a
M: 389e7e2fa0a4fb494f6ecb854a677d04e6ed79af 192.168.100.42:6379
slots:1880-5460(3581 slots) master
1 additionalreplica(s)
S: fec421bd36ad2730864d520240c77248494881cd192.168.100.42:7379
slots: (0 slots)slave
replicates389e7e2fa0a4fb494f6ecb854a677d04e6ed79af
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 192.168.100.41:8379to make it join the cluster.
[OK] New node added correctly.
#check 加入节点后的集群信息
/usr/local/redis-3.2/bin/redis-trib.rbcheck 192.168.100.41:7379
>>> Performing Cluster Check (using node192.168.100.41:7379)
S: 589ff9053237d77131f4cc6f6cf0006b3e38ea56192.168.100.41:7379
slots: (0 slots)slave
replicatesc2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
M: 2c332aaea894f479c462f6d3eaac580b4833babd192.168.100.41:8379
slots: (0 slots)master
0 additionalreplica(s)
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd192.168.100.41:6379
slots:9223-16383(7161 slots) master
1 additional replica(s)
M: c10928731b4563ec3aa7a60c6837ee77b8b0f95a192.168.100.43:6379
slots:0-1879,5461-9222 (5642 slots) master
1 additionalreplica(s)
S: dba4b4dca703cd2776e2771f8805139a2beaa306192.168.100.43:7379
slots: (0 slots)slave
replicatesc10928731b4563ec3aa7a60c6837ee77b8b0f95a
M: 389e7e2fa0a4fb494f6ecb854a677d04e6ed79af192.168.100.42:6379
slots:1880-5460(3581 slots) master
1 additionalreplica(s)
S: fec421bd36ad2730864d520240c77248494881cd192.168.100.42:7379
slots: (0 slots)slave
replicates389e7e2fa0a4fb494f6ecb854a677d04e6ed79af
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
#继续添加192.168.100.42:8379 192.168.100.43:8379
#设置主从
/usr/local/redis-3.2/bin/redis-cli -c -h 192.168.100.42 -p8379
192.168.100.42:8379>
192.168.100.42:8379> cluster replicate2c332aaea894f479c462f6d3eaac580b4833babd
OK
192.168.100.42:8379>
/usr/local/redis-3.2/bin/redis-cli -c -h 192.168.100.43 -p8379
192.168.100.43:8379> cluster replicate2c332aaea894f479c462f6d3eaac580b4833babd
OK
/usr/local/redis-3.2/bin/redis-trib.rb check192.168.100.41:7379
>>> Performing Cluster Check (using node192.168.100.41:7379)
S: 589ff9053237d77131f4cc6f6cf0006b3e38ea56 192.168.100.41:7379
slots: (0 slots)slave
replicatesc2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
M: c10928731b4563ec3aa7a60c6837ee77b8b0f95a192.168.100.43:6379
slots:0-1879,5461-9222 (5642 slots) master
1 additionalreplica(s)
S: a2632a65e72f04eb4e3b7cda228908574438e1cb192.168.100.42:8379
slots: (0 slots)slave
replicates2c332aaea894f479c462f6d3eaac580b4833babd
S: fec421bd36ad2730864d520240c77248494881cd192.168.100.42:7379
slots: (0 slots)slave
replicates389e7e2fa0a4fb494f6ecb854a677d04e6ed79af
M: 2c332aaea894f479c462f6d3eaac580b4833babd192.168.100.41:8379
slots: (0 slots)master
2 additionalreplica(s)
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd192.168.100.41:6379
slots:9223-16383(7161 slots) master
1 additionalreplica(s)
S: 744ee15ad1ec0ee98bf9a94c24262cd9242e7105192.168.100.43:8379
slots: (0 slots)slave
replicates2c332aaea894f479c462f6d3eaac580b4833babd
M: 389e7e2fa0a4fb494f6ecb854a677d04e6ed79af192.168.100.42:6379
slots:1880-5460 (3581slots) master
1 additionalreplica(s)
S: dba4b4dca703cd2776e2771f8805139a2beaa306192.168.100.43:7379
slots: (0 slots)slave
replicatesc10928731b4563ec3aa7a60c6837ee77b8b0f95a
#重新平衡slot
/usr/local/redis-3.2/bin/redis-trib.rb reshard 192.168.100.41:7379
Moving slot 10229 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10230 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10231 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10232 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10233 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10234 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10235 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10236 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10237 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10238 from 192.168.100.41:6379 to192.168.100.42:6379:
Moving slot 10239 from 192.168.100.41:6379 to192.168.100.42:6379:
#删除节点
/usr/local/redis-3.2/bin/redis-trib.rbdel-node 192.168.100.41:8379 2c332aaea894f479c462f6d3eaac580b4833babd
>>> Removing node2c332aaea894f479c462f6d3eaac580b4833babd from cluster 192.168.100.41:8379
>>> Sending CLUSTER FORGET messages to thecluster...
>>> SHUTDOWN the node.
/usr/local/redis-3.2/bin/redis-trib.rbdel-node 192.168.100.42:8379 a2632a65e72f04eb4e3b7cda228908574438e1cb
>>> Removing nodea2632a65e72f04eb4e3b7cda228908574438e1cb from cluster 192.168.100.42:8379
>>> Sending CLUSTER FORGET messages to thecluster...
>>> SHUTDOWN the node.
/usr/local/redis-3.2/bin/redis-trib.rbdel-node 192.168.100.43:8379 744ee15ad1ec0ee98bf9a94c24262cd9242e7105
>>> Removing node744ee15ad1ec0ee98bf9a94c24262cd9242e7105 from cluster 192.168.100.43:8379
>>> Sending CLUSTER FORGET messages to thecluster...
>>> SHUTDOWN the node.
#failover 关闭主节点192.168.100.418379
[root@master conf]# redis-cli -h 192.168.100.41 -p 8379 debug segfault
Error: Server closed the connection
[root@master conf]# /usr/local/redis-3.2/bin/redis-trib.rbcheck 192.168.100.41:7379
[ERR] Sorry, can't connect to node 192.168.100.41:8379
*** WARNING: 192.168.100.43:8379 claims to be slave ofunknown node ID c7c4a1fb3d86f047276385b5695aaca1e1137818.
*** WARNING: 192.168.100.42:8379 claims to be slave ofunknown node ID c7c4a1fb3d86f047276385b5695aaca1e1137818.
>>> Performing Cluster Check (using node192.168.100.41:7379)
S: 589ff9053237d77131f4cc6f6cf0006b3e38ea56192.168.100.41:7379
slots: (0 slots)slave
replicatesc10928731b4563ec3aa7a60c6837ee77b8b0f95a
M: c10928731b4563ec3aa7a60c6837ee77b8b0f95a192.168.100.43:6379
slots:1250-5119(3870 slots) master
1 additionalreplica(s)
S: fec421bd36ad2730864d520240c77248494881cd192.168.100.42:7379
slots: (0 slots)slave
replicates c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
S: d25b0f21422628ca876459675895b0ca6e5cb3ec192.168.100.43:8379
slots: (0 slots)slave
replicatesc7c4a1fb3d86f047276385b5695aaca1e1137818
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd192.168.100.41:6379
slots:11740-16383(4644 slots) master
1 additionalreplica(s)
S: 96dbe347b4ceeb419005ab1a3f98a11c7821ff07192.168.100.42:8379
slots: (0 slots)slave
replicatesc7c4a1fb3d86f047276385b5695aaca1e1137818
M: 389e7e2fa0a4fb494f6ecb854a677d04e6ed79af 192.168.100.42:6379
slots:6370-10239(3870 slots) master
1 additionalreplica(s)
S: dba4b4dca703cd2776e2771f8805139a2beaa306192.168.100.43:7379
slots: (0 slots)slave
replicates389e7e2fa0a4fb494f6ecb854a677d04e6ed79af
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[ERR] Not all 16384 slots are covered by nodes.
#M: 96dbe347b4ceeb419005ab1a3f98a11c7821ff07192.168.100.42:8379 变成主节点
[root@master conf]# /usr/local/redis-3.2/bin/redis-trib.rbcheck 192.168.100.41:7379
>>> Performing Cluster Check (using node192.168.100.41:7379)
S: 589ff9053237d77131f4cc6f6cf0006b3e38ea56192.168.100.41:7379
slots: (0 slots)slave
replicatesc10928731b4563ec3aa7a60c6837ee77b8b0f95a
M: c10928731b4563ec3aa7a60c6837ee77b8b0f95a192.168.100.43:6379
slots:1250-5119(3870 slots) master
1 additionalreplica(s)
S: fec421bd36ad2730864d520240c77248494881cd192.168.100.42:7379
slots: (0 slots)slave
replicatesc2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
S: d25b0f21422628ca876459675895b0ca6e5cb3ec192.168.100.43:8379
slots: (0 slots)slave
replicates96dbe347b4ceeb419005ab1a3f98a11c7821ff07
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd192.168.100.41:6379
slots:11740-16383(4644 slots) master
1 additionalreplica(s)
M: 96dbe347b4ceeb419005ab1a3f98a11c7821ff07192.168.100.42:8379
slots:0-1249,5120-6369,10240-11739 (4000 slots) master
1 additionalreplica(s)
M: 389e7e2fa0a4fb494f6ecb854a677d04e6ed79af192.168.100.42:6379
slots:6370-10239 (3870slots) master
1 additionalreplica(s)
S: dba4b4dca703cd2776e2771f8805139a2beaa306192.168.100.43:7379
slots: (0 slots)slave
replicates389e7e2fa0a4fb494f6ecb854a677d04e6ed79af
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
#启动失败的主节点，自动变成从节点
[root@master conf]# salt 'master.wboy.cn' cmd.run '/usr/local/redis-3.2/bin/redis-server/usr/local/redis-3.2/conf/redis-8379.conf'
master.wboy.com:
[root@master conf]# /usr/local/redis-3.2/bin/redis-trib.rbcheck 192.168.100.41:7379
>>> Performing Cluster Check (using node192.168.100.41:7379)
S: 589ff9053237d77131f4cc6f6cf0006b3e38ea56192.168.100.41:7379
slots: (0 slots)slave
replicatesc10928731b4563ec3aa7a60c6837ee77b8b0f95a
M: c10928731b4563ec3aa7a60c6837ee77b8b0f95a192.168.100.43:6379
slots:1250-5119(3870 slots) master
1 additionalreplica(s)
S: c7c4a1fb3d86f047276385b5695aaca1e1137818192.168.100.41:8379
slots: (0 slots) slave
replicates96dbe347b4ceeb419005ab1a3f98a11c7821ff07
S: fec421bd36ad2730864d520240c77248494881cd192.168.100.42:7379
slots: (0 slots)slave
replicatesc2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd
S: d25b0f21422628ca876459675895b0ca6e5cb3ec 192.168.100.43:8379
slots: (0 slots)slave
replicates96dbe347b4ceeb419005ab1a3f98a11c7821ff07
M: c2b3c9cb4b040e4ce48c7a20b4000a1d02e674bd192.168.100.41:6379
slots:11740-16383(4644 slots) master
1 additionalreplica(s)
M: 96dbe347b4ceeb419005ab1a3f98a11c7821ff07192.168.100.42:8379
slots:0-1249,5120-6369,10240-11739 (4000 slots) master
2 additionalreplica(s)
M: 389e7e2fa0a4fb494f6ecb854a677d04e6ed79af192.168.100.42:6379
slots:6370-10239(3870 slots) master
1 additionalreplica(s)
S: dba4b4dca703cd2776e2771f8805139a2beaa306192.168.100.43:7379
slots: (0 slots)slave
replicates389e7e2fa0a4fb494f6ecb854a677d04e6ed79af
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
本文转自andylhz 51CTO博客，原文链接：http://blog.51cto.com/andylhz2009/1844181，如需转载请自行联系原作者
