Redis集群迁移节点
1、当前集群现状说明192.168.85.156 7001 主
192.168.85.156 7002 从
192.168.85.156 7003 从
192.168.85.157 7004 主
192.168.85.157 7005 主
192.168.85.157 7006 从
计划把7005主节点，迁移到新的一台机器192.168.85.158上去
2、安装新节点，并加入集群
tar zxvf redis-3.2.5.tar.gz
cd redis-3.2.5
make
mak install
cd utils/
./install_server.sh
# ./install_server.sh
Welcome to the redis service installer
This script will help you easily set up a running redis server
Please select the redis port for this instance: [6379] 7005
Please select the redis config file name [/etc/redis/7005.conf] 回车默认
Selected default - /etc/redis/7001.conf
Please select the redis log file name [/var/log/redis_7005.log] 回车默认
Selected default - /var/log/redis_7005.log
Please select the data directory for this instance [/var/lib/redis/7005] /data/redis3
Please select the redis executable path [/usr/local/bin/redis-server] /usr/local/bin/redis-server
Selected config:
Port : 7005
Config file : /etc/redis/7005.conf
Log file : /var/log/redis_7005.log
Data dir : /data/redis3
Executable : /usr/local/bin/redis-server
Cli Executable : /usr/local/bin/redis-cli
Is this ok? Then press ENTER to go on or Ctrl-C to abort.
Copied /tmp/7001.conf => /etc/init.d/redis_7005
Installing service...
Successfully added to chkconfig!
Successfully added to runlevels 345!
Starting Redis server...
Installation successful!
修改配置文件/etc/redis/7005.conf
sed -i '$ a\cluster-enabled yes' /etc/redis/7005.conf
sed -i '$ a\cluster-config-file \/data\/redis3\/nodes-7005.conf' /etc/redis/7005.conf
sed -i '$ a\cluster-node-timeout 15000' /etc/redis/7005.conf
sed -i 's/bind 127.0.0.1/ bind 0.0.0.0/g' /etc/redis/7005.conf
重启
service redis_7005 restart
3、将新节点加入集群
redis-trib.rb add-node 192.168.85.158:7005 192.168.85.157:7005
add-node是加入集群节点，192.168.85.158:7005为要加入的节点，192.168.85.157:7005 表示加入的集群的一个节点，用来辨识是哪个集群
4、迁移节点solt
# redis-trib.rb check 192.168.85.157:7005
>>> Performing Cluster Check (using node 192.168.85.157:7005)
M: 8c4b95726f481c7c953da110771b1832daa1815f 192.168.85.157:7005
slots:6484-16383 (9900 slots) master
1 additional replica(s)
M: 1f48df22516542856bbdc874b3ddf613d7645a1d 192.168.85.158:7005
slots: (0 slots) master
0 additional replica(s)
S: e1094c6a1143b7ca407e0bf3e33650bad61fc089 192.168.85.157:7006
slots: (0 slots) slave
replicates 8c4b95726f481c7c953da110771b1832daa1815f
M: ec2cc9445ebe752434dc4922a2a6f14cead16bce 192.168.85.157:7004
slots:0-5459 (5460 slots) master
1 additional replica(s)
M: 3859d8f88f59fbefbb9627c252caeecd9a638bbc 192.168.85.156:7001
slots:5460-6483 (1024 slots) master
1 additional replica(s)
S: 922f2ab7ed7e9bd9c5c8c2b41423c327c101b57e 192.168.85.156:7002
slots: (0 slots) slave
replicates 3859d8f88f59fbefbb9627c252caeecd9a638bbc
S: 5a573047d926dc8b7f3665c2a3e3aec2a1e87fe1 192.168.85.156:7003
slots: (0 slots) slave
replicates ec2cc9445ebe752434dc4922a2a6f14cead16bce
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
如上图，我们现在要从192.168.85.157:7005上迁移9900个solt到192。168.85.158:7005上去，命令如下
# redis-trib.rb reshard --from 8c4b95726f481c7c953da110771b1832daa1815f --to 1f48df22516542856bbdc874b3ddf613d7645a1d --slots 9900 --yes 192.168.85.156:7001
完成之后，在次查看集群状态
由上图，可见，192.168.85.157上的7005节点的solt已全部迁移到192.168.85.158上。
删除192.168.85.157:7005空节点
redis-trib.rb del-node '192.168.85.157:7005' 8c4b95726f481c7c953da110771b1832daa1815f
在次查看集群状态
# redis-trib.rb check 192.168.85.158:7005
至此， Redis集群迁移节点迁移过程完成。
6、redis-trib.rb命令相关功能参数
create：创建集群
check：检查集群
info：查看集群信息
fix：修复集群
reshard：在线迁移slot
rebalance：平衡集群节点slot数量
add-node：将新节点加入集群
del-node：从集群中删除节点
set-timeout：设置集群节点间心跳连接的超时时间
call：在集群全部节点上执行命令
import：将外部redis数据导入集群
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