六 、管理集群

2.1 集群选举测试 ： 停止某个主库的redi服务 对应的从会自动升级主库
2.2 向集群中添加新节点主机 192.168.4.77
1 在主机57运行redis服务（要做对应的集群配置）
装包 初始配置
修改配置文件
vim /etc/redis/6379.conf
停止服务
启动服务
查看端口号
11 yum -y install gcc
12 init 6
13 ls
14 tar -zxf redis-4.0.8.tar.gz
15 cd redis-4.0.8/
16 make
17 make install
18 ./utils/install_server.sh
19 /etc/init.d/redis_6379 status
20 /etc/init.d/redis_6379 stop
21 vim /etc/redis/6379.conf
22 /etc/init.d/redis_6379 start
23 /etc/init.d/redis_6379 status
[root@redis77 redis-4.0.8]# netstat -utnalp | grep redis-server
tcp 0 0 192.168.4.77:16077 0.0.0.0:* LISTEN 4705/redis-server 1
tcp 0 0 192.168.4.77:6077 0.0.0.0:* LISTEN 4705/redis-server 1
[root@redis77 redis-4.0.8]#
redis-trib.rb 选项
add-node 添加主机 (主机的角色是master)
check 检查集群
reshard 重新分配hash slot
2 把主机77添加到集群里
redis-trib.rb add-node 192.168.4.77:6077 192.168.4.71:6071
[root@redis71 ~]# redis-trib.rb add-node 192.168.4.77:6077 192.168.4.71:6071
>>> Adding node 192.168.4.77:6077 to cluster 192.168.4.71:6071
>>> Performing Cluster Check (using node 192.168.4.71:6071)
S: 3bfd47406253a25be9b13504ff0ecdd8524e9a9a 192.168.4.71:6071
slots: (0 slots) slave
replicates abb585e1803d756eb0b2d9a1b23790b6712ee7b2
M: cc0f13a4183eb06a771c5190319f7ac40626d04b 192.168.4.73:6073
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 5172f3a9cbd4fe8a488a8d45bdf60ae46ac9f900 192.168.4.76:6076
slots: (0 slots) slave
replicates 9717d02408e45ad996dcdbde6401bf1319727e22
S: 30aac94cf32bd5d2446b584be5e7c6b0c07f7da0 192.168.4.74:6074
slots: (0 slots) slave
replicates cc0f13a4183eb06a771c5190319f7ac40626d04b
M: 9717d02408e45ad996dcdbde6401bf1319727e22 192.168.4.72:6072
slots:5461-10922 (5462 slots) master
1 additional replica(s)
M: abb585e1803d756eb0b2d9a1b23790b6712ee7b2 192.168.4.75:6075
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.
>>> Send CLUSTER MEET to node 192.168.4.77:6077 to make it join the cluster.
[OK] New node added correctly.
[root@redis71 ~]#
redis-trib.rb check 192.168.4.77:6077
[root@redis71 ~]# redis-trib.rb check 192.168.4.77:6077
>>> Performing Cluster Check (using node 192.168.4.77:6077)
M: 6cd754d126998090dcbe409315d7577bcd3b5605 192.168.4.77:6077
slots: (0 slots) master
0 additional replica(s)
S: 5172f3a9cbd4fe8a488a8d45bdf60ae46ac9f900 192.168.4.76:6076
slots: (0 slots) slave
replicates 9717d02408e45ad996dcdbde6401bf1319727e22
M: abb585e1803d756eb0b2d9a1b23790b6712ee7b2 192.168.4.75:6075
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 3bfd47406253a25be9b13504ff0ecdd8524e9a9a 192.168.4.71:6071
slots: (0 slots) slave
replicates abb585e1803d756eb0b2d9a1b23790b6712ee7b2
M: cc0f13a4183eb06a771c5190319f7ac40626d04b 192.168.4.73:6073
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 9717d02408e45ad996dcdbde6401bf1319727e22 192.168.4.72:6072
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 30aac94cf32bd5d2446b584be5e7c6b0c07f7da0 192.168.4.74:6074
slots: (0 slots) slave
replicates cc0f13a4183eb06a771c5190319f7ac40626d04b
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@redis71 ~]#
手动重新分配hash slot
]# redis-trib.rb reshard 192.168.4.77:6077
4096 拿出多少个 hash slot 给主机 192.168.4.77
主机 192.168.4.77 id 值
all 从当前所有的master里 获取hash slot 个数
检查集群主机状态信息
[root@redis71 ~]# redis-trib.rb check 192.168.4.77:6077
>>> Performing Cluster Check (using node 192.168.4.77:6077)
M: 6cd754d126998090dcbe409315d7577bcd3b5605 192.168.4.77:6077
slots:0-1364,5461-6826,10923-12287 (4096 slots) master
0 additional replica(s)
删除节点主机
1 删除master角色的节点主机
1.1 移除占用的hash槽（slot）
1.2 删除主机
]#redis-trib.rb reshard 192.168.4.51:6051
4096 移除hash槽的个数
主机id 目标主机id
主机id 源主机id
done 设置完毕
yes 提交
]# redis-trib.rb del-node 192.168.4.51:6051 8eecda17577349125df9a6fcc37107c6c5f9bdc5
2 删除slave角色的节点主机
]# redis-trib.rb del-node 192.168.4.51:6051 651f7d99965316c1b8a27a2e9b034a5b14c2be55
添加slave角色主机
1 主机运行redis服务 并设置集群配置
2 添加slave角色主机
]# redis-trib.rb add-node --slave 要添加到集群中主机ip：端口 集群中已有的任意一个主机的ip:端口
[ERR] Node 192.168.4.54:6054 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
rm -rf /var/lib/redis/6379/
mkdir /var/lib/redis/6379/
chmod -R a+w /var/lib/redis/6379/
rm -rf /var/run/redis_6379.pid
/etc/init.d/redis_6379 start
211 /etc/init.d/redis_6379 status
212 redis-cli -h 192.168.4.54 -p 6054
[root@db54 redis]# redis-cli -c -h 192.168.4.54 -p 6054
192.168.4.54:6054> CLUSTER info
cluster_state:fail
cluster_slots_assigned:0
192.168.4.54:6054> CLUSTER RESET
OK

192.168.4.54:6054>quit;

 ]# redis-trib.rb add-node --slave 192.168.4.54:6054 192.168.4.51:6051

192.168.4.54:6054> CLUSTER nodes
5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052@16052 master - 0

1526121459000 2 connected 5461-9677 9679-10922
6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053@16053 master - 0 1526121460637

3 connected 10923-16383
f7d5c6065d155b5d3d02a4efba10ca2d3722f634 192.168.4.54:6054@16054 myself,slave

0ec903c572270a90f3b140fba31aac15aaf5336b 0 1526121460000 0 connected
0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051@16051 master - 0 1526121459635

8 connected 0-5460 9678
a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056@16056 slave

5278df7384edc9774b1a36b0b9d60a813a7424a9 0 1526121460000 2 connected
192.168.4.54:6054>