redis集群在线迁移
地址规划
| 主机名 | ip地 | 端口 |
| redis01 | 10.0.0.10 | 6379、6380 |
| redis02 | 10.0.0.60 | 6379、6380 |
| redis03 | 10.0.0.61 | 6379、6380 |
| redis04 | 10.0.0.70 | 6379、6380 |
| redis05 | 10.0.0.71 | 6379、6380 |
| redis06 | 10.0.0.72 | 6379、6380 |
其中前三台为老集群节点，后三台为新集群节点，本篇针对生成环境，在线迁移集群，不停机。
集群搭建在https://www.cnblogs.com/zh-dream/p/12249767.html
准备工作
[root@redis01 module]# mkdir -p /etc
[root@redis01 module]# mkdir -p /etc [root@redis01 module]# cp redis-5.0./etc/redis.conf /etc/ [root@redis01 module]# cp redis-5.0./etc/redis.conf /etc/ [root@redis01 module]# mkdir /{data,run,logs}
[root@redis01 module]# mkdir /{data,run,logs}
修改配置文件
[root@redis01 module]# sed -ri -e 's@^(dir /data/module/).*@\16380/data@' -e 's@^(pidfile ).*@\1/data/module/6380/run/redis_6380.pid@' -e 's/^(port )6379/\16380/' -e 's@^(logfile "/data/module/).*@\16380/logs/redis_6380.log"@' -e 's@^# cluster-config-file nodes-6379.conf@cluster-config-file nodes-6380.conf@' /etc/redis.conf [root@redis01 module]# sed -ri -e 's@^(dir /data/module/).*@\16379/data@' -e 's@^(pidfile ).*@\1/data/module/6379/run/redis_6379.pid@' -e 's@^(logfile "/data/module/).*@\16379/logs/redis_6379.log"@' -e 's@^# cluster-config-file nodes-6379.conf@cluster-config-file nodes-6379.conf@' /etc/redis.conf
启动redis实例
[root@redis01 module]# for i in ;do redis-server $i/etc/redis.conf;done [root@redis01 module]# ss -lntp
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 10.0.0.10: *:* users:(("redis-server",pid=,fd=))
LISTEN 10.0.0.10: *:* users:(("redis-server",pid=,fd=))
LISTEN *: *:* users:(("sshd",pid=,fd=))
LISTEN 127.0.0.1: *:* users:(("master",pid=,fd=))
LISTEN 10.0.0.10: *:* users:(("redis-server",pid=,fd=))
LISTEN 10.0.0.10: *:* users:(("redis-server",pid=,fd=))
LISTEN ::: :::* users:(("sshd",pid=,fd=))
LISTEN ::: :::* users:(("master",pid=,fd=))
建立集群
先加入主节点
[root@redis01 module]# redis-cli --cluster create 10.0.0.10: 10.0.0.60: 10.0.0.61:
>>> Performing hash slots allocation on nodes...
Master[] -> Slots -
Master[] -> Slots -
Master[] -> Slots -
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
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 10.0.0.10:)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
在集群指定主从关系
[root@redis01 module]# redis-cli --cluster add-node --cluster-slave 10.0.0.60: 10.0.0.10:
>>> Adding node 10.0.0.60: to cluster 10.0.0.10:
>>> Performing Cluster Check (using node 10.0.0.10:)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
Automatically selected master 10.0.0.10:
>>> Send CLUSTER MEET to node 10.0.0.60: to make it join the cluster.
Waiting for the cluster to join >>> Configure node as replica of 10.0.0.10:.
[OK] New node added correctly.
[root@redis01 module]# redis-cli --cluster add-node --cluster-slave 10.0.0.61: 10.0.0.60:
>>> Adding node 10.0.0.61: to cluster 10.0.0.60:
>>> Performing Cluster Check (using node 10.0.0.60:)
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
Automatically selected master 10.0.0.60:
>>> Send CLUSTER MEET to node 10.0.0.61: to make it join the cluster.
Waiting for the cluster to join >>> Configure node as replica of 10.0.0.60:.
[OK] New node added correctly.
[root@redis01 module]# redis-cli --cluster add-node --cluster-slave 10.0.0.10: 10.0.0.61:
>>> Adding node 10.0.0.10: to cluster 10.0.0.61:
>>> Performing Cluster Check (using node 10.0.0.61:)
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
Automatically selected master 10.0.0.61:
>>> Send CLUSTER MEET to node 10.0.0.10: to make it join the cluster.
Waiting for the cluster to join >>> Configure node as replica of 10.0.0.61:.
[OK] New node added correctly.
检测集群状态
[root@redis01 module]# redis-cli --cluster check 10.0.0.10:
10.0.0.10: (aca05ab1...) -> keys | slots | slaves.
10.0.0.61: (c934fb00...) -> keys | slots | slaves.
10.0.0.60: (e6fd058c...) -> keys | slots | slaves.
[OK] keys in masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 10.0.0.10:)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered. #在集群中插入几条数据，待迁移后检测使用
将迁移的目标节点加入集群
添加主节点
[root@redis01 module]# redis-cli --cluster add-node 10.0.0.70: 10.0.0.10:
>>> Adding node 10.0.0.70: to cluster 10.0.0.10:
>>> Performing Cluster Check (using node 10.0.0.10:)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
>>> Send CLUSTER MEET to node 10.0.0.70: to make it join the cluster.
[OK] New node added correctly.
[root@redis01 module]# redis-cli --cluster add-node 10.0.0.71: 10.0.0.10:
>>> Adding node 10.0.0.71: to cluster 10.0.0.10:
>>> Performing Cluster Check (using node 10.0.0.10:)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots: ( slots) master
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
>>> Send CLUSTER MEET to node 10.0.0.71: to make it join the cluster.
[OK] New node added correctly.
[root@redis01 module]# redis-cli --cluster add-node 10.0.0.72: 10.0.0.10:
>>> Adding node 10.0.0.72: to cluster 10.0.0.10:
>>> Performing Cluster Check (using node 10.0.0.10:)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
M: fd7f797b72b9f6c04de8d879743b2f6b508a7415 10.0.0.71:
slots: ( slots) master
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots: ( slots) master
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
>>> Send CLUSTER MEET to node 10.0.0.72: to make it join the cluster.
[OK] New node added correctly.
添加从节点
[root@redis01 module]# redis-cli --cluster add-node --cluster-slave 10.0.0.70: 10.0.0.71:
>>> Adding node 10.0.0.70: to cluster 10.0.0.71:
>>> Performing Cluster Check (using node 10.0.0.71:)
M: fd7f797b72b9f6c04de8d879743b2f6b508a7415 10.0.0.71:
slots: ( slots) master
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots: ( slots) master
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
M: d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4 10.0.0.72:
slots: ( slots) master
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
Automatically selected master 10.0.0.71:
>>> Send CLUSTER MEET to node 10.0.0.70: to make it join the cluster.
Waiting for the cluster to join >>> Configure node as replica of 10.0.0.71:.
[OK] New node added correctly.
[root@redis01 module]# redis-cli --cluster add-node --cluster-slave 10.0.0.71: 10.0.0.72:
>>> Adding node 10.0.0.71: to cluster 10.0.0.72:
>>> Performing Cluster Check (using node 10.0.0.72:)
M: d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4 10.0.0.72:
slots: ( slots) master
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
S: 2585c89e3e905202c3df1f8c0d75fe716591a972 10.0.0.70:
slots: ( slots) slave
replicates fd7f797b72b9f6c04de8d879743b2f6b508a7415
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots: ( slots) master
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
M: fd7f797b72b9f6c04de8d879743b2f6b508a7415 10.0.0.71:
slots: ( slots) master
additional replica(s)
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
Automatically selected master 10.0.0.72:
>>> Send CLUSTER MEET to node 10.0.0.71: to make it join the cluster.
Waiting for the cluster to join >>> Configure node as replica of 10.0.0.72:.
[OK] New node added correctly.
[root@redis01 module]# redis-cli --cluster add-node --cluster-slave 10.0.0.72: 10.0.0.70:
>>> Adding node 10.0.0.72: to cluster 10.0.0.70:
>>> Performing Cluster Check (using node 10.0.0.70:)
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots: ( slots) master
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
S: 2585c89e3e905202c3df1f8c0d75fe716591a972 10.0.0.70:
slots: ( slots) slave
replicates fd7f797b72b9f6c04de8d879743b2f6b508a7415
M: fd7f797b72b9f6c04de8d879743b2f6b508a7415 10.0.0.71:
slots: ( slots) master
additional replica(s)
M: d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4 10.0.0.72:
slots: ( slots) master
additional replica(s)
S: e6124e0803cc6a3b5b3b030a733f1e58d3cbb80c 10.0.0.71:
slots: ( slots) slave
replicates d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
Automatically selected master 10.0.0.70:
>>> Send CLUSTER MEET to node 10.0.0.72: to make it join the cluster.
Waiting for the cluster to join >>> Configure node as replica of 10.0.0.70:.
[OK] New node added correctly.
检查新节点的槽数，新添加的主节点槽数都是0，需要重新分片
[root@redis01 module]# redis-cli --cluster check 10.0.0.70:
10.0.0.70: (76206b5f...) -> keys | slots | slaves.
10.0.0.10: (aca05ab1...) -> keys | slots | slaves.
10.0.0.61: (c934fb00...) -> keys | slots | slaves.
10.0.0.60: (e6fd058c...) -> keys | slots | slaves.
10.0.0.71: (fd7f797b...) -> keys | slots | slaves.
10.0.0.72: (d44d3c8b...) -> keys | slots | slaves.
[OK] keys in masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 10.0.0.70:)
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots: ( slots) master
additional replica(s)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
16 additional replica(s)
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
S: 2585c89e3e905202c3df1f8c0d75fe716591a972 10.0.0.70:
slots: ( slots) slave
replicates fd7f797b72b9f6c04de8d879743b2f6b508a7415
M: fd7f797b72b9f6c04de8d879743b2f6b508a7415 10.0.0.71:
slots: ( slots) master
additional replica(s)
M: d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4 10.0.0.72:
slots: ( slots) master
additional replica(s)
S: e6124e0803cc6a3b5b3b030a733f1e58d3cbb80c 10.0.0.71:
slots: ( slots) slave
replicates d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
S: 54924e469a1003913f135de3116c7d53c41b5e69 10.0.0.72:
slots: ( slots) slave
replicates 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
重新分片
[root@redis01 module]# redis-cli --cluster reshard 10.0.0.70:
>>> Performing Cluster Check (using node 10.0.0.70:)
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots: ( slots) master
additional replica(s)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots:[-] ( slots) master
additional replica(s)
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates c934fb00e04727cbe3ebec8ec52b629df8a4c760
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[-] ( slots) master
additional replica(s)
S: 2585c89e3e905202c3df1f8c0d75fe716591a972 10.0.0.70:
slots: ( slots) slave
replicates fd7f797b72b9f6c04de8d879743b2f6b508a7415
M: fd7f797b72b9f6c04de8d879743b2f6b508a7415 10.0.0.71:
slots: ( slots) master
additional replica(s)
M: d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4 10.0.0.72:
slots: ( slots) master
additional replica(s)
S: e6124e0803cc6a3b5b3b030a733f1e58d3cbb80c 10.0.0.71:
slots: ( slots) slave
replicates d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates aca05ab1ffe0079493ad73cd045b14bd21941e07
S: 54924e469a1003913f135de3116c7d53c41b5e69 10.0.0.72:
slots: ( slots) slave
replicates 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
How many slots do you want to move (from to )?
What is the receiving node ID? 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #: aca05ab1ffe0079493ad73cd045b14bd21941e07
Source node #: done Ready to move slots.
Source nodes:
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots:[-] ( slots) master
additional replica(s)
Destination node:
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots: ( slots) master
additional replica(s)
Resharding plan:
Moving slot from aca05ab1ffe0079493ad73cd045b14bd21941e07
Moving slot from aca05ab1ffe0079493ad73cd045b14bd21941e07
Moving slot from aca05ab1ffe0079493ad73cd045b14bd21941e07 Do you want to proceed with the proposed reshard plan (yes/no)? yes
Moving slot from 10.0.0.10: to 10.0.0.70::
Moving slot from 10.0.0.10: to 10.0.0.70::
Moving slot from 10.0.0.10: to 10.0.0.70::
Moving slot from 10.0.0.10: to 10.0.0.70::
Moving slot from 10.0.0.10: to 10.0.0.70::
Moving slot from 10.0.0.10: to 10.0.0.70::
Moving slot from 10.0.0.10: to 10.0.0.70::
Moving slot from 10.0.0.10: to 10.0.0.70::
Moving slot from 10.0.0.10: to 10.0.0.70:: [root@redis01 module]# redis-cli --cluster reshard 10.0.0.71: [OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
How many slots do you want to move (from to )?
What is the receiving node ID? fd7f797b72b9f6c04de8d879743b2f6b508a7415
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #: e6fd058cb888fbe014bbc93d59eaf0595b1d514c
Source node #: done Moving slot from e6fd058cb888fbe014bbc93d59eaf0595b1d514c
Moving slot from e6fd058cb888fbe014bbc93d59eaf0595b1d514c
Moving slot from e6fd058cb888fbe014bbc93d59eaf0595b1d514c
Moving slot from e6fd058cb888fbe014bbc93d59eaf0595b1d514c
Moving slot from e6fd058cb888fbe014bbc93d59eaf0595b1d514c
Moving slot from e6fd058cb888fbe014bbc93d59eaf0595b1d514c Do you want to proceed with the proposed reshard plan (yes/no)? yes Moving slot from 10.0.0.60: to 10.0.0.71::
Moving slot from 10.0.0.60: to 10.0.0.71::
Moving slot from 10.0.0.60: to 10.0.0.71::
Moving slot from 10.0.0.60: to 10.0.0.71::
Moving slot from 10.0.0.60: to 10.0.0.71::
Moving slot from 10.0.0.60: to 10.0.0.71::
Moving slot from 10.0.0.60: to 10.0.0.71::
[root@redis01 module]# redis-cli --cluster reshard 10.0.0.72: [OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered.
How many slots do you want to move (from to )?
What is the receiving node ID? d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #: c934fb00e04727cbe3ebec8ec52b629df8a4c760
Source node #: done
查看是否老集群的哈希槽都移到了新集群节点上
[root@redis01 module]# redis-cli --cluster check 10.0.0.70:
10.0.0.70: (76206b5f...) -> keys | slots | slaves.
10.0.0.10: (aca05ab1...) -> keys | slots | slaves.
10.0.0.61: (c934fb00...) -> keys | slots | slaves.
10.0.0.60: (e6fd058c...) -> keys | slots | slaves.
10.0.0.71: (fd7f797b...) -> keys | slots | slaves.
10.0.0.72: (d44d3c8b...) -> keys | slots | slaves.
[OK] keys in masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 10.0.0.70:)
M: 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a 10.0.0.70:
slots:[-] ( slots) master
additional replica(s)
M: aca05ab1ffe0079493ad73cd045b14bd21941e07 10.0.0.10:
slots: ( slots) master
M: c934fb00e04727cbe3ebec8ec52b629df8a4c760 10.0.0.61:
slots: ( slots) master
S: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 10.0.0.10:
slots: ( slots) slave
replicates d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4
S: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d 10.0.0.61:
slots: ( slots) slave
replicates e6fd058cb888fbe014bbc93d59eaf0595b1d514c
M: e6fd058cb888fbe014bbc93d59eaf0595b1d514c 10.0.0.60:
slots:[] ( slots) master
additional replica(s)
S: 2585c89e3e905202c3df1f8c0d75fe716591a972 10.0.0.70:
slots: ( slots) slave
replicates fd7f797b72b9f6c04de8d879743b2f6b508a7415
M: fd7f797b72b9f6c04de8d879743b2f6b508a7415 10.0.0.71:
slots:[-] ( slots) master
additional replica(s)
M: d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4 10.0.0.72:
slots:[-] ( slots) master
additional replica(s)
S: e6124e0803cc6a3b5b3b030a733f1e58d3cbb80c 10.0.0.71:
slots: ( slots) slave
replicates d44d3c8baf3ffd9041ef22ad1fdbc840d886aca4
S: 25b3f9781fd913d2c783ab24fa2c79a74a08070b 10.0.0.60:
slots: ( slots) slave
replicates 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a
S: 54924e469a1003913f135de3116c7d53c41b5e69 10.0.0.72:
slots: ( slots) slave
replicates 76206b5fd10ffff1f0bf4287ff1bdbad9eb0c01a
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All slots covered. [root@redis01 module]# redis-cli --cluster info 10.0.0.70:
10.0.0.70: (76206b5f...) -> keys | slots | slaves.
10.0.0.10: (aca05ab1...) -> keys | slots | slaves.
10.0.0.61: (c934fb00...) -> keys | slots | slaves.
10.0.0.60: (e6fd058c...) -> keys | slots | slaves.
10.0.0.71: (fd7f797b...) -> keys | slots | slaves.
10.0.0.72: (d44d3c8b...) -> keys | slots | slaves.
[OK] keys in masters.
0.00 keys per slot on average.
在新节点检查之前插入的数据
[root@redis01 module]# redis-cli -c -h 10.0.0.70 -p
10.0.0.70:> get name
-> Redirected to slot [] located at 10.0.0.71:
"tom"
10.0.0.71:> get foo
-> Redirected to slot [] located at 10.0.0.72:
"bar"
提示：上面的操作可以使用 redis-cli --cluster reshard --cluster-from <sourcenode-id> --cluster-to <destnode-id> --cluster-slots <number of slots> --cluster-yes
删除原来的节点
先删除从节点
[root@redis01 module]# redis-cli --cluster del-node 10.0.0.10: e6124e0803cc6a3b5b3b030a733f1e58d3cbb80c
>>> Removing node e6124e0803cc6a3b5b3b030a733f1e58d3cbb80c from cluster 10.0.0.10:
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
[root@redis01 module]# redis-cli --cluster del-node 10.0.0.60: 25b3f9781fd913d2c783ab24fa2c79a74a08070b
>>> Removing node 25b3f9781fd913d2c783ab24fa2c79a74a08070b from cluster 10.0.0.60:
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
[root@redis01 module]# redis-cli --cluster del-node 10.0.0.61: 9b88fbde76b12e035d71056881c8ed09ce6aeb0d
>>> Removing node 9b88fbde76b12e035d71056881c8ed09ce6aeb0d from cluster 10.0.0.61:
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
注意：
一定不要写错ID 这个主要是以id号来删除节点 输入错了节点id 会出现如下错误信息： [ERR] Node 10.0.0.71: is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database . 需要启动这个节点，修复一下就好了 [root@redis05 module]# redis-server /etc/redis.conf [root@redis01 module]# redis-cli --cluster fix 10.0.0.71:
从集群中删除迁移之前的master主节点。
删除master主节点时需注意下面节点：
- 如果主节点有从节点，需要将从节点转移到其他主节点或提前删除从节点
- 如果主节点有slot，去掉分配的slot，然后再删除主节点。 除master主节点时，必须确保它上面的slot为0，即必须为空！否则可能会导致整个redis cluster集群无法工作！ 如果要移除的master节点不是空的，需要先用重新分片命令来把数据移到其他的节点。
另外一个移除master节点的方法是先进行一次手动的失效备援，等它的slave被选举为新的master，并且它被作为一个新的slave被重新加到集群中来之后再移除它。
很明显，如果你是想要减少集群中的master数量，这种做法没什么用。在这种情况下你还是需要用重新分片来移除数据后再移除它。
[root@redis01 module]# redis-cli --cluster del-node 10.0.0.60: e6fd058cb888fbe014bbc93d59eaf0595b1d514c
>>> Removing node e6fd058cb888fbe014bbc93d59eaf0595b1d514c from cluster 10.0.0.60:
[ERR] Node 10.0.0.60: is not empty! Reshard data away and try again.
由于已经将原来的三个master主节点的slot全部抽完了，即slot现在都为0，且他们各自的slave节点也已在上面删除
可以删除主节点
[root@redis01 module]# redis-cli --cluster del-node 10.0.0.10: f2a07c9d27d6d62d40bec2bc6914fd0757e7d072
>>> Removing node f2a07c9d27d6d62d40bec2bc6914fd0757e7d072 from cluster 10.0.0.10:
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node. [root@redis01 module]# redis-cli --cluster del-node 10.0.0.60: e6fd058cb888fbe014bbc93d59eaf0595b1d514c
>>> Removing node e6fd058cb888fbe014bbc93d59eaf0595b1d514c from cluster 10.0.0.60:
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node. [root@redis01 module]# redis-cli --cluster del-node 10.0.0.61: c934fb00e04727cbe3ebec8ec52b629df8a4c760
>>> Removing node c934fb00e04727cbe3ebec8ec52b629df8a4c760 from cluster 10.0.0.61:
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
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