前篇介绍的redis replication方法，操作步骤多，而且容易出错。在git上看到一些开源工具也能实现同步迁移功能，而且步骤简单，比如redis-port,redis-migrate-tool等工具。实验演示使用redis-migrate-tool，将redis cluster 迁移到一个单实例redis中。
1.redis-migrate-tool的安装
需要注意的是安装redis-migrate-tool依赖automake, libtool, autoconf and bzip2这些包
2..运行环境
源节点：10.86.30.37:36379/10.86.30.37:36380/10.86.30.37:36381
[root@10_86_30_37_10.86.30.37 redis-migrate-tool]# redis-cli -c -p 36379 -h 10.86.30.37 cluster nodes
7fab85269fe72d68414ffd15a54605d45f280aff 10.86.30.37:36381 master - 0 1477555329981 7 connected 10001-16383
e0c45fe484e55967c968814076b0a5f67f4f6821 10.86.30.37:36380 master - 0 1477555330984 8 connected 5001-10000
ba3d6a50ef6bdf6212c0360baec97f29f3b25385 10.86.30.37:36379 myself,master - 0 0 6 connected 0-5000
目标节点：10.86.30.37:6389
3.迁移过程
- redis cluster向redis单实例迁移配置文件
[source] type: redis cluster servers: - 10.86.30.37:36379 [target] type: single servers: - 10.86.30.37:6389 [common] listen: 0.0.0.0:8888
- 执行命令进行同步
/usr/local/redis-migrate-tool/src/redis-migrate-tool -c mgr.conf -d
- 查看同步后的文件
[root@10_86_30_37_10.86.30.37 redis]# redis-cli -h 10.86.30.37 -p 6389 keys * 1) "5" 2) "2" 3) "1" 4) "10" 5) "12" 6) "3" 7) "4" 8) "13" 9) "11" [root@10_86_30_37_10.86.30.37 redis]# redis-cli -h 10.86.30.37 -p 36379 keys * 1) "10" 2) "11" 3) "3" [root@10_86_30_37_10.86.30.37 redis]# redis-cli -h 10.86.30.37 -p 36380 keys * 1) "12" 2) "1" 3) "2" 4) "5" [root@10_86_30_37_10.86.30.37 redis]# redis-cli -h 10.86.30.37 -p 36381 keys * 1) "13" 2) "4"
所有节点数据同步到了但实例节点中，插入数据测试
[root@10_86_30_37_10.86.30.37 redis]# redis-cli -h 10.86.30.37 -p 36379 -c 10.86.30.37:36379> set 30 30 -> Redirected to slot [9877] located at 10.86.30.37:36380 OK 10.86.30.37:36380> set 31 31 -> Redirected to slot [14004] located at 10.86.30.37:36381 OK 10.86.30.37:36381> set 32 32 -> Redirected to slot [1751] located at 10.86.30.37:36379 OK [root@10_86_30_37_10.86.30.37 redis]# redis-cli -h 10.86.30.37 -p 6389 keys * 1) "5" 2) "30" 3) "31" 4) "2" 5) "1" 6) "10" 7) "21" 8) "12" 9) "3" 10) "4" 11) "13" 12) "32" 13) "11"
可以看到新增数据也同步到了redis单实例节点中
4.利用redis-migrate-tool的工具进行更全面的验证
- 利用redis-migrate-tool提供的命令进行一致性校验：
[root@10_86_30_37_10.86.30.37 redis]# /usr/local/redis-migrate-tool/src/redis-migrate-tool -c mgr.conf log -C redis_check Check job is running... Checked keys: 1000 Inconsistent value keys: 0 Inconsistent expire keys : 0 Other check error keys: 0 Checked OK keys: 1000 All keys checked OK! Check job finished, used 0.047s
- 利用redis-migrate-tool提供的命令进行插入校验：
[root@10_86_30_37_10.86.30.37 redis]# /usr/local/redis-migrate-tool/src/redis-migrate-tool -c mgr.conf log -C redis_testinsert Test insert job is running... Insert string keys: 200 Insert list keys : 200 Insert set keys : 200 Insert zset keys : 200 Insert hash keys : 200 Insert total keys : 1000 Correct inserted keys: 1000 Test insert job finished, used 0.417s
需要注意的是，插入校验生成的数据并不会清除，如果只是为了测试功能，那么可以减少插入的key。