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首先我们既然要搭建集群,那么master节点至少要3个,slave节点也是3个,为什么呢?这是因为一个redis集群如果要对外提供可用的服务,那么集群中必须要有过半的master节点正常工作。基于这个特性,如果想搭建一个能够允许 n 个master节点挂掉的集群,那么就要搭建2n+1个master节点的集群。(感觉和Zookeeper的vote机制差不多)
如:
2个master节点,挂掉1个,则1不过半,则集群down掉,无法使用,容错率为0
3个master节点,挂掉1个,2>1,还可以正常运行,容错率为1
4个master节点,挂掉1个,3>1,还可以正常运行,但是当挂掉2个时,2=2,不过半,容错率依然为1
如果创建集群时设置slave为1个
--cluster-replicas 1
则当总节点少于6个时会有如下报错:
- [root@wzy-cloud 7000]# redis-cli --cluster create 0.0.0.0:7000 0.0.0.0:7001 0.0.0.0:7002 --cluster-replicas 1 -a wzy123
- Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
- *** ERROR: Invalid configuration for cluster creation.
- *** Redis Cluster requires at least 3 master nodes.
- *** This is not possible with 3 nodes and 1 replicas per node.
- *** At least 6 nodes are required.
所以集群搭建至少需要6个节点哦~
首先尼,由于条件限制,我只有一台服务器,所以节点ip都一致,只是端口不同,有条件的朋友可以多ip哦。
我们先在redis根目录下
mkdir redis_cluster
并在redis_cluster目录下分别创建7000、7001、7002、7003、7004、7005,并将redis.conf文件cp到这几个文件夹下
- [root@wzy-cloud redis_cluster]# pwd
- /usr/local/redis/redis_cluster
- [root@wzy-cloud redis_cluster]# ll
- total 24
- drwxr-xr-x 2 root root 4096 Jul 17 21:43 7000
- drwxr-xr-x 2 root root 4096 Jul 17 16:36 7001
- drwxr-xr-x 2 root root 4096 Jul 17 16:36 7002
- drwxrwxr-x 2 root root 4096 Jul 17 16:37 7003
- drwxrwxr-x 2 root root 4096 Jul 17 16:37 7004
- drwxrwxr-x 2 root root 4096 Jul 17 16:38 7005
- cp redis.conf redis_cluster/7000
- cp redis.conf redis_cluster/7001
- cp redis.conf redis_cluster/7002
- cp redis.conf redis_cluster/7003
- cp redis.conf redis_cluster/7004
- cp redis.conf redis_cluster/7005
然后修改各个文件夹中的redis.conf
- port 7000 //端口7000,7002,7003
- bind 本机ip //默认ip为127.0.0.1 需要改为其他节点机器可访问的ip 否则创建集群时无法访问对应的端口,无法创建集群,我这里是注释掉了,不知道0.0.0.0行不行
- daemonize yes //redis后台运行
- pidfile /var/run/redis_7000.pid //pidfile文件对应7000,7001,7002
- cluster-enabled yes //开启集群 把注释#去掉
- cluster-config-file nodes_7000.conf //集群的配置 配置文件首次启动自动生成 7000,7001,7002
- cluster-node-timeout 15000 //请求超时 默认15秒,可自行设置
- appendonly yes //aof日志开启 有需要就开启,它会每次写操作都记录一条日志
然后分别启动这6个节点,也可以写个shell一键搞定~
- [root@wzy-cloud redis]# cat startRedis.sh
- redis-server /usr/local/redis/redis_cluster/7000/redis.conf
- redis-server /usr/local/redis/redis_cluster/7001/redis.conf
- redis-server /usr/local/redis/redis_cluster/7002/redis.conf
- redis-server /usr/local/redis/redis_cluster/7003/redis.conf
- redis-server /usr/local/redis/redis_cluster/7004/redis.conf
- redis-server /usr/local/redis/redis_cluster/7005/redis.conf
- [root@wzy-cloud redis]# ./startRedis.sh
- [root@wzy-cloud redis]# ps -ef|grep redis
- root 6304 1 0 21:44 ? 00:00:00 redis-server 0.0.0.0:7000 [cluster]
- root 6306 1 0 21:44 ? 00:00:00 redis-server 0.0.0.0:7001 [cluster]
- root 6308 1 0 21:44 ? 00:00:00 redis-server 0.0.0.0:7002 [cluster]
- root 6310 1 0 21:44 ? 00:00:00 redis-server 0.0.0.0:7003 [cluster]
- root 6318 1 0 21:44 ? 00:00:00 redis-server 0.0.0.0:7004 [cluster]
- root 6320 1 0 21:44 ? 00:00:00 redis-server 0.0.0.0:7005 [cluster]
- root 6345 4985 0 21:44 pts/0 00:00:00 grep --color=auto redi
-
所有节点启动好后,输入以下命令创建集群,注意ip哦,是你的本地ip
注意:如果输入命令后没有反应,那可能是防火墙的关系,关掉防火墙就好了
[root@wzy-cloud redis]# redis-cli --cluster create 114.116.35.252:7000 114.116.35.252:7001 114.116.35.252:7002 114.116.35.252:7003 114.116.35.252:7004 114.116.35.252:7005 --cluster-replicas 1
如果加了密码,那么创建集群时就需要加-a wzy123参数
[root@wzy-cloud redis]# redis-cli --cluster create 114.116.35.252:7000 114.116.35.252:7001 114.116.35.252:7002 114.116.35.252:7003 114.116.35.252:7004 114.116.35.252:7005 --cluster-replicas 1 -a wzy123
不然会报以下错误
[ERR] Node 114.116.35.252:7000 NOAUTH Authentication required.
输入创建集群的命令后会出现以下提示,注意Can I set the above configuration? (type 'yes' to accept): yes,该处请输入yes,不然好像分配不了哈希槽(别人说的,没试)
- [root@wzy-cloud redis_cluster]# redis-cli --cluster create 114.116.35.252:7000 114.116.35.252:7001 114.116.35.252:7002 114.116.35.252:7003 114.116.35.252:7004 114.116.35.252:7005 --cluster-replicas 1 -a wzy123
- Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
- >>> Performing hash slots allocation on 6 nodes...
- Master[0] -> Slots 0 - 5460
- Master[1] -> Slots 5461 - 10922
- Master[2] -> Slots 10923 - 16383
- Adding replica 114.116.35.252:7003 to 114.116.35.252:7000
- Adding replica 114.116.35.252:7004 to 114.116.35.252:7001
- Adding replica 114.116.35.252:7005 to 114.116.35.252:7002
- >>> Trying to optimize slaves allocation for anti-affinity
- [WARNING] Some slaves are in the same host as their master
- M: 4e571c020d1f2cca020132a9adfdea2a367da21d 114.116.35.252:7000
- slots:[0-5460] (5461 slots) master
- M: 838382153a78260e274c1d2d11a105dd3986a223 114.116.35.252:7001
- slots:[5461-10922] (5462 slots) master
- M: e86d01e92214015304461a104a9f14e3cedc7829 114.116.35.252:7002
- slots:[10923-16383] (5461 slots) master
- S: 22b1f3d83f068973c6e8a5d0b9e87c0c1b950594 114.116.35.252:7003
- replicates 838382153a78260e274c1d2d11a105dd3986a223
- S: 5248474e122d745b7e929a2705da210d3d150b4c 114.116.35.252:7004
- replicates e86d01e92214015304461a104a9f14e3cedc7829
- S: b3d20a419df22b4c9f4fe14c1fda22c2920c5c11 114.116.35.252:7005
- replicates 4e571c020d1f2cca020132a9adfdea2a367da21d
- Can I set the above configuration? (type 'yes' to accept): yes
输完yes后,会出现如下提示,[OK] All 16384 slots covered.说明成功啦
- 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 0.0.0.0:7000)
- M: 4e571c020d1f2cca020132a9adfdea2a367da21d 114.116.35.252:7000
- slots:[0-5460] (5461 slots) master
- 1 additional replica(s)
- S: b3d20a419df22b4c9f4fe14c1fda22c2920c5c11 114.116.35.252:7005
- slots: (0 slots) slave
- replicates 4e571c020d1f2cca020132a9adfdea2a367da21d
- M: e86d01e92214015304461a104a9f14e3cedc7829 114.116.35.252:7002
- slots:[10923-16383] (5461 slots) master
- 1 additional replica(s)
- S: 22b1f3d83f068973c6e8a5d0b9e87c0c1b950594 114.116.35.252:7003
- slots: (0 slots) slave
- replicates 838382153a78260e274c1d2d11a105dd3986a223
- M: 838382153a78260e274c1d2d11a105dd3986a223 114.116.35.252:7001
- slots:[5461-10922] (5462 slots) master
- 1 additional replica(s)
- S: 5248474e122d745b7e929a2705da210d3d150b4c 114.116.35.252:7004
- slots: (0 slots) slave
- replicates e86d01e92214015304461a104a9f14e3cedc7829
- [OK] All nodes agree about slots configuration.
- >>> Check for open slots...
- >>> Check slots coverage...
- [OK] All 16384 slots covered.
验证一下
- [root@wzy-cloud redis_cluster]# redis-cli -c -p 7000
- 127.0.0.1:7000> auth wzy123
- OK
- 127.0.0.1:7000> cluster nodes
- b3d20a419df22b4c9f4fe14c1fda22c2920c5c11 114.116.35.252:7005@17005 slave 4e571c020d1f2cca020132a9adfdea2a367da21d 0 1563378113000 6 connected
- e86d01e92214015304461a104a9f14e3cedc7829 114.116.35.252:7002@17002 master - 0 1563378115000 3 connected 10923-16383
- 22b1f3d83f068973c6e8a5d0b9e87c0c1b950594 114.116.35.252:7003@17003 slave 838382153a78260e274c1d2d11a105dd3986a223 0 1563378116490 4 connected
- 838382153a78260e274c1d2d11a105dd3986a223 114.116.35.252:7001@17001 master - 0 1563378114486 2 connected 5461-10922
- 5248474e122d745b7e929a2705da210d3d150b4c 114.116.35.252:7004@17004 slave e86d01e92214015304461a104a9f14e3cedc7829 0 1563378115488 5 connected
- 4e571c020d1f2cca020132a9adfdea2a367da21d 114.116.35.252:7000@17000 myself,master - 0 1563378114000 1 connected 0-5460
- 114.116.35.252:7000> set qwe 111
- OK
- 114.116.35.252:7000>exit
-
-
- [root@wzy-cloud 7000]# redis-cli -c -p 7003
- 114.116.35.252:7003> auth wzy123
- OK
- 114.116.35.252:7003> get qwe
- -> Redirected to slot [757] located at 127.0.0.1:7000
- (error) NOAUTH Authentication required.
- 114.116.35.252:7000> auth wzy123
- OK
- 127.0.0.1:7000> get qwe
- "111"
- 127.0.0.1:7000>
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