Redis Cluster 自動化安裝,擴容和縮容

来源:https://www.cnblogs.com/wy123/archive/2019/12/10/12012848.html

Redis Cluster 自動化安裝,擴容和縮容 之前寫過一篇基於python的redis集群自動化安裝的實現,基於純命令的集群實現還是相當繁瑣的,因此官方提供了redis-trib.rb這個工具雖然官方的的redis-trib.rb提供了集群創建、 檢查、 修複、均衡等命令行工具,之所個人接受不 ...


Redis Cluster 自動化安裝,擴容和縮容

之前寫過一篇基於python的redis集群自動化安裝的實現,基於純命令的集群實現還是相當繁瑣的,因此官方提供了redis-trib.rb這個工具
雖然官方的的redis-trib.rb提供了集群創建、 檢查、 修複、均衡等命令行工具,之所個人接受不了redis-trib.rb,原因在於redis-trib.rb無法自定義實現集群中節點的主從關係。
比如ABCDEF6個節點,在創建集群的過程中必然要明確指定哪些是主,哪些是從,主從對應關係,可惜通過redis-trib.rb無法自定義控制,參考如下截圖。
更多的時候,是需要明確指明哪些機器作為主節點,哪些作為從節點,redis-trib.rb做不到自動控制集群中的哪些機器(實例)作為主,哪些機器(實例)作為從。
如果使用redis-trib.rb,還需要解決ruby的環境依賴,因此個人不太接受使用redis-trib.rb搭建集群。

引用《Redis開發與運維》裡面的原話:
如果部署節點使用不同的IP地址, redis-trib.rb會儘可能保證主從節點不分配在同一機器下, 因此會重新排序節點列表順序。
節點列表順序用於確定主從角色, 先主節點之後是從節點。
這說明:使用redis-trib.rb是無法人為地完全控制主從節點的分配的。

後面redis 5.0版本的Redis-cli --cluster已經實現了集群的創建,無需依賴redis-trib.rb,包括ruby環境,redis 5.0版本Redis-cli --cluster本身已經實現了集群等相關功能
但是基於純命令本身還是比較複雜的,尤其是在較為複雜的生產環境,通過手動方式來創建集群,擴容或者縮容,會存在一系列的手工操作,以及一些不安全因素。
所以,自動化的集群創建 ,擴容以及縮容是有必要的。

 

測試環境

這裡基於python3,以redis-cli --cluster命令為基礎,實現redis自動化集群,自動化擴容,自動化縮容

測試環境以單機多實例為示例,一共8個節點,
1,自動化集群的創建,6各節點(10001~10006)創建為3主(10001~10002)3從(10004~10006)的集群
2,集群的自動化擴容,增加新節點10007為主節點,同時添加10008為10007節點的slave節點
3,集群的自動化縮容,與2相反,移除集群中的10007以及其slave的10008節點

 

Redis集群創建

集群的本質是執行兩組命令,一個是將主節點加入到集群中,一個是依次對主節點添加slave節點。
但是期間會涉及到找到各個節點id的邏輯,因此手動實現的話,比較繁瑣。
主要命令如下:

################# create cluster #################
redis-cli --cluster create 127.0.0.1:10001 127.0.0.1:10002 127.0.0.1:10003 -a ****** --cluster-yes
################# add slave nodes #################
redis-cli --cluster add-node 127.0.0.1:10004 127.0.0.1:10001 --cluster-slave --cluster-master-id 6164025849a8ff9297664fc835bc851af5004f61 -a ******
redis-cli --cluster add-node 127.0.0.1:10005 127.0.0.1:10002 --cluster-slave --cluster-master-id 64e634307bdc339b503574f5a77f1b156c021358 -a ******
redis-cli --cluster add-node 127.0.0.1:10006 127.0.0.1:10003 --cluster-slave --cluster-master-id 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a -a ******

 

這裡使用python創建的過程中列印出來redis-cli --cluster 命令的日誌信息

[[email protected] redis_install]# python3 create_redis_cluster.py
################# flush master/slave slots #################
################# create cluster #################
redis-cli --cluster create 127.0.0.1:10001 127.0.0.1:10002 127.0.0.1:10003   -a ****** --cluster-yes
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing hash slots allocation on 3 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
M: 6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001
   slots:[0-5460] (5461 slots) master
M: 64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002
   slots:[5461-10922] (5462 slots) master
M: 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003
   slots:[10923-16383] (5461 slots) master
>>> 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 127.0.0.1:10001)
M: 6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001
   slots:[0-5460] (5461 slots) master
M: 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003
   slots:[10923-16383] (5461 slots) master
M: 64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002
   slots:[5461-10922] (5462 slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
0
################# add slave nodes #################
redis-cli --cluster add-node 127.0.0.1:10004 127.0.0.1:10001 --cluster-slave --cluster-master-id 6164025849a8ff9297664fc835bc851af5004f61 -a ******
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Adding node 127.0.0.1:10004 to cluster 127.0.0.1:10001
>>> Performing Cluster Check (using node 127.0.0.1:10001)
M: 6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001
   slots:[0-5460] (5461 slots) master
M: 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003
   slots:[10923-16383] (5461 slots) master
M: 64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002
   slots:[5461-10922] (5462 slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 127.0.0.1:10004 to make it join the cluster.
Waiting for the cluster to join

>>> Configure node as replica of 127.0.0.1:10001.
[OK] New node added correctly.
0
redis-cli --cluster add-node 127.0.0.1:10005 127.0.0.1:10002 --cluster-slave --cluster-master-id 64e634307bdc339b503574f5a77f1b156c021358 -a ******
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Adding node 127.0.0.1:10005 to cluster 127.0.0.1:10002
>>> Performing Cluster Check (using node 127.0.0.1:10002)
M: 64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002
   slots:[5461-10922] (5462 slots) master
S: 026f0179631f50ca858d46c2b2829b3af71af2c8 127.0.0.1:10004
   slots: (0 slots) slave
   replicates 6164025849a8ff9297664fc835bc851af5004f61
M: 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003
   slots:[10923-16383] (5461 slots) master
M: 6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001
   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 127.0.0.1:10005 to make it join the cluster.
Waiting for the cluster to join

>>> Configure node as replica of 127.0.0.1:10002.
[OK] New node added correctly.
0
redis-cli --cluster add-node 127.0.0.1:10006 127.0.0.1:10003 --cluster-slave --cluster-master-id 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a -a ******
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Adding node 127.0.0.1:10006 to cluster 127.0.0.1:10003
>>> Performing Cluster Check (using node 127.0.0.1:10003)
M: 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003
   slots:[10923-16383] (5461 slots) master
M: 64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: 23e1871c4e1dc1047ce567326e74a6194589146c 127.0.0.1:10005
   slots: (0 slots) slave
   replicates 64e634307bdc339b503574f5a77f1b156c021358
M: 6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: 026f0179631f50ca858d46c2b2829b3af71af2c8 127.0.0.1:10004
   slots: (0 slots) slave
   replicates 6164025849a8ff9297664fc835bc851af5004f61
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 127.0.0.1:10006 to make it join the cluster.
Waiting for the cluster to join

>>> Configure node as replica of 127.0.0.1:10003.
[OK] New node added correctly.
0
################# cluster nodes info: #################
8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003@20003 myself,master - 0 1575947748000 53 connected 10923-16383
64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002@20002 master - 0 1575947748000 52 connected 5461-10922
23e1871c4e1dc1047ce567326e74a6194589146c 127.0.0.1:10005@20005 slave 64e634307bdc339b503574f5a77f1b156c021358 0 1575947746000 52 connected
6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001@20001 master - 0 1575947748103 51 connected 0-5460
026f0179631f50ca858d46c2b2829b3af71af2c8 127.0.0.1:10004@20004 slave 6164025849a8ff9297664fc835bc851af5004f61 0 1575947749000 51 connected
9f265545ebb799d2773cfc20c71705cff9d733ae 127.0.0.1:10006@20006 slave 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 0 1575947749105 53 connected

[[email protected] redis_install]#

 

Redis集群擴容

redis擴容主要分為兩步:
1,增加主節點,同時為主節點增加從節點。
2,重新分配slot到新增加的master節點上。

主要命令如下:

增加主節點到集群中
redis-cli --cluster add-node 127.0.0.1:10007 127.0.0.1:10001 -a ******
為增加的主節點添加從節點
redis-cli --cluster add-node 127.0.0.1:10008 127.0.0.1:10007 --cluster-slave --cluster-master-id 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 -a ******

重新分片slot
############################ execute reshard #########################################
redis-cli -a [email protected] --cluster reshard 127.0.0.1:10001 --cluster-from 6164025849a8ff9297664fc835bc851af5004f61 --cluster-to 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1
############################ execute reshard #########################################
redis-cli -a [email protected] --cluster reshard 127.0.0.1:10002 --cluster-from 64e634307bdc339b503574f5a77f1b156c021358 --cluster-to 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1
############################ execute reshard #########################################
redis-cli -a [email protected] --cluster reshard 127.0.0.1:10003 --cluster-from 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a --cluster-to 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1

################# cluster nodes info: #################
026f0179631f50ca858d46c2b2829b3af71af2c8 127.0.0.1:[email protected] slave 6164025849a8ff9297664fc835bc851af5004f61 0 1575960493000 64 connected
9f265545ebb799d2773cfc20c71705cff9d733ae 127.0.0.1:[email protected] slave 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 0 1575960493849 66 connected
64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:[email protected] master - 0 1575960494852 65 connected 6826-10922
23e1871c4e1dc1047ce567326e74a6194589146c 127.0.0.1:[email protected] slave 64e634307bdc339b503574f5a77f1b156c021358 0 1575960492000 65 connected
4854375c501c3dbfb4e2d94d50e62a47520c4f12 127.0.0.1:[email protected] slave 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 0 1575960493000 67 connected
8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:[email protected] master - 0 1575960493000 66 connected 12288-16383
3645e00a8ec3a902bd6effb4fc20c56a00f2c982 127.0.0.1:[email protected] myself,master - 0 1575960493000 67 connected 0-1364 5461-6825 10923-12287
6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:[email protected] master - 0 1575960492848 64 connected 1365-5460
可見新加的節點成功重新分配了slot,集群擴容成功。

這裡有幾個需要註意的兩個問題,如果是自動化安裝的話:
1,add-node之後(不管是柱節點還是從節點),要sleep足夠長的時間(這裡是20秒),讓集群中所有的節點都meet到新節點,否則會擴容失敗
2,新節點的reshard之後要sleep足夠長的時間(這裡是20秒),否則繼續reshard其他節點的slot會導致上一個reshared失敗

 

整個過程如下

[[email protected] redis_install]# python3 create_redis_cluster.py
#########################cleanup instance#################################
#########################add node into cluster#################################
 redis-cli --cluster add-node 127.0.0.1:10007 127.0.0.1:10001  -a [email protected]
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Adding node 127.0.0.1:10007 to cluster 127.0.0.1:10001
>>> Performing Cluster Check (using node 127.0.0.1:10001)
M: 6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: 9f265545ebb799d2773cfc20c71705cff9d733ae 127.0.0.1:10006
   slots: (0 slots) slave
   replicates 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a
M: 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
S: 026f0179631f50ca858d46c2b2829b3af71af2c8 127.0.0.1:10004
   slots: (0 slots) slave
   replicates 6164025849a8ff9297664fc835bc851af5004f61
S: 23e1871c4e1dc1047ce567326e74a6194589146c 127.0.0.1:10005
   slots: (0 slots) slave
   replicates 64e634307bdc339b503574f5a77f1b156c021358
M: 64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002
   slots:[5461-10922] (5462 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 127.0.0.1:10007 to make it join the cluster.
[OK] New node added correctly.
0
 redis-cli --cluster add-node 127.0.0.1:10008 127.0.0.1:10007 --cluster-slave --cluster-master-id 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 -a ******
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Adding node 127.0.0.1:10008 to cluster 127.0.0.1:10007
>>> Performing Cluster Check (using node 127.0.0.1:10007)
M: 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 127.0.0.1:10007
   slots: (0 slots) master
S: 026f0179631f50ca858d46c2b2829b3af71af2c8 127.0.0.1:10004
   slots: (0 slots) slave
   replicates 6164025849a8ff9297664fc835bc851af5004f61
S: 9f265545ebb799d2773cfc20c71705cff9d733ae 127.0.0.1:10006
   slots: (0 slots) slave
   replicates 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a
M: 64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: 23e1871c4e1dc1047ce567326e74a6194589146c 127.0.0.1:10005
   slots: (0 slots) slave
   replicates 64e634307bdc339b503574f5a77f1b156c021358
M: 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
M: 6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001
   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 127.0.0.1:10008 to make it join the cluster.
Waiting for the cluster to join

>>> Configure node as replica of 127.0.0.1:10007.
[OK] New node added correctly.
0
#########################reshard slots#################################
############################ execute reshard #########################################
redis-cli -a [email protected] --cluster reshard 127.0.0.1:10001 --cluster-from 6164025849a8ff9297664fc835bc851af5004f61 --cluster-to 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000   --cluster-replace  >/dev/null 2>&1
############################ execute reshard #########################################
redis-cli -a [email protected] --cluster reshard 127.0.0.1:10002 --cluster-from 64e634307bdc339b503574f5a77f1b156c021358 --cluster-to 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000   --cluster-replace  >/dev/null 2>&1
############################ execute reshard #########################################
redis-cli -a [email protected] --cluster reshard 127.0.0.1:10003 --cluster-from 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a --cluster-to 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000   --cluster-replace  >/dev/null 2>&1
################# cluster nodes info: #################
026f0179631f50ca858d46c2b2829b3af71af2c8 127.0.0.1:10004@20004 slave 6164025849a8ff9297664fc835bc851af5004f61 0 1575960493000 64 connected
9f265545ebb799d2773cfc20c71705cff9d733ae 127.0.0.1:10006@20006 slave 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 0 1575960493849 66 connected
64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:10002@20002 master - 0 1575960494852 65 connected 6826-10922
23e1871c4e1dc1047ce567326e74a6194589146c 127.0.0.1:10005@20005 slave 64e634307bdc339b503574f5a77f1b156c021358 0 1575960492000 65 connected
4854375c501c3dbfb4e2d94d50e62a47520c4f12 127.0.0.1:10008@20008 slave 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 0 1575960493000 67 connected
8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:10003@20003 master - 0 1575960493000 66 connected 12288-16383
3645e00a8ec3a902bd6effb4fc20c56a00f2c982 127.0.0.1:10007@20007 myself,master - 0 1575960493000 67 connected 0-1364 5461-6825 10923-12287
6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:10001@20001 master - 0 1575960492848 64 connected 1365-5460

[[email protected] redis_install]#

 

Redis集群縮容

縮容按道理是擴容的反向操作.
從這個命令就可以看出來:del-node host:port node_id #刪除給定的一個節點,成功後關閉該節點服務。
縮容就縮容了,從集群中移除掉(cluster forget nodeid)某個主節點就行了,為什麼還要關閉?因此本文不會採用redis-cli --cluster del-node的方式縮容,而是通過普通命令行來縮容。

這裡的自定義縮容實質上分兩步
1,將移除的主節點的slot分配回集群中其他節點,這裡測試四個主節點縮容為三個主節點,實際上執行命令如下。
2,集群中的節點依次執行cluster forget master_node_id(slave_node_id)

############################ execute reshard #########################################
redis-cli -a ****** --cluster reshard 127.0.0.1:10001 --cluster-from 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-to 6164025849a8ff9297664fc835bc851af5004f61 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1
############################ execute reshard #########################################
redis-cli -a ****** --cluster reshard 127.0.0.1:10002 --cluster-from 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-to 64e634307bdc339b503574f5a77f1b156c021358 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1
############################ execute reshard #########################################
redis-cli -a ****** --cluster reshard 127.0.0.1:10003 --cluster-from 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-to 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1

{'host': '127.0.0.1', 'port': 10001, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10001, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10002, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10002, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10003, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10003, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10004, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10004, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10005, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10005, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10006, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10006, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12

 

完整代碼如下

[[email protected] redis_install]# python3 create_redis_cluster.py
############################ execute reshard #########################################
redis-cli -a ****** --cluster reshard 127.0.0.1:10001 --cluster-from 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-to 6164025849a8ff9297664fc835bc851af5004f61 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1
############################ execute reshard #########################################
redis-cli -a ****** --cluster reshard 127.0.0.1:10002 --cluster-from 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-to 64e634307bdc339b503574f5a77f1b156c021358 --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1
############################ execute reshard #########################################
redis-cli -a ****** --cluster reshard 127.0.0.1:10003 --cluster-from 3645e00a8ec3a902bd6effb4fc20c56a00f2c982 --cluster-to 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a --cluster-slots 1365 --cluster-yes --cluster-timeout 50000 --cluster-pipeline 10000 --cluster-replace >/dev/null 2>&1
{'host': '127.0.0.1', 'port': 10001, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10001, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10002, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10002, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10003, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10003, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10004, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10004, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10005, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10005, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
{'host': '127.0.0.1', 'port': 10006, 'password': '******'}--->cluster forget 3645e00a8ec3a902bd6effb4fc20c56a00f2c982
{'host': '127.0.0.1', 'port': 10006, 'password': '******'}--->cluster forget 4854375c501c3dbfb4e2d94d50e62a47520c4f12
################# cluster nodes info: #################
23e1871c4e1dc1047ce567326e74a6194589146c 127.0.0.1:[email protected] slave 64e634307bdc339b503574f5a77f1b156c021358 0 1575968426000 76 connected
026f0179631f50ca858d46c2b2829b3af71af2c8 127.0.0.1:[email protected] slave 6164025849a8ff9297664fc835bc851af5004f61 0 1575968422619 75 connected
6164025849a8ff9297664fc835bc851af5004f61 127.0.0.1:[email protected] myself,master - 0 1575968426000 75 connected 0-5460
9f265545ebb799d2773cfc20c71705cff9d733ae 127.0.0.1:[email protected] slave 8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 0 1575968425000 77 connected
8b75325c59a7242344d0ebe5ee1e0068c66ffa2a 127.0.0.1:[email protected] master - 0 1575968427626 77 connected 10923-16383
64e634307bdc339b503574f5a77f1b156c021358 127.0.0.1:[email protected] master - 0 1575968426000 76 connected 5461-10922

[[email protected] redis_install]#

其實到這裡並沒有結束,這裡要求縮容之後集群中的所有節點都要成功地執行cluster forget master_node_id(和slave_node_id)
否則其他節點仍然有10007節點的心跳信息,超過1分鐘之後,仍舊會將已經踢出集群的10007節點(以及從節點10008)會被添加回來
這就一開始就遇到一個奇葩問題,因為沒有在縮容後的集群的slave節點上執行cluster forget,被移除的節點,會不斷地被添加回來……。
參考這裡:http://www.redis.cn/commands/cluster-forget.html

 

 

 

完整的代碼實現如下

import os
import time
import redis
from time import ctime,sleep


def create_redis_cluster(list_master_node,list_slave_node):
    print('################# flush master/slave slots #################')
    for node in list_master_node:
        currenrt_conn = redis.StrictRedis(host=node["host"], port=node["port"], password=node["password"], decode_responses=True)
        currenrt_conn.execute_command('flushall')
        currenrt_conn.execute_command('cluster reset')

    for node in list_slave_node:
        currenrt_conn = redis.StrictRedis(host=node["host"], port=node["port"], password=node["password"], decode_responses=True)
        #currenrt_conn.execute_command('flushall')
        currenrt_conn.execute_command('cluster reset')

    print('################# create cluster #################')
    master_nodes = ''
    for node in list_master_node:
        master_nodes = master_nodes + node["host"] + ':' + str(node["port"]) + ' '
    command = "redis-cli --cluster create {0}  -a ****** --cluster-yes".format(master_nodes)
    print(command)
    msg = os.system(command)
    print(msg)
    time.sleep(5)

    print('################# add slave nodes #################')
    counter = 0
    for node in list_master_node:
        currenrt_conn = redis.StrictRedis(host=node["host"], port=node["port"], password=node["password"], decode_responses=True)
        current_master_node = node["host"] + ':' + str(node["port"])
        current_slave_node = list_slave_node[counter]["host"] + ':' + str(list_slave_node[counter]["port"])
        myid = currenrt_conn.cluster('myid')
        #slave 節點在前,master節點在後
        command = "redis-cli --cluster add-node {0} {1} --cluster-slave --cluster-master-id {2} -a ****** ". format(current_slave_node,current_master_node,myid)
        print(command)
        msg = os.system(command)
        counter = counter + 1
        print(msg)
    # show cluster nodes info
    time.sleep(10)
    print("################# cluster nodes info: #################")
    cluster_nodes = currenrt_conn.execute_command('cluster nodes')
    print(cluster_nodes)

# 返回擴容後,原始節點中,每個主節點需要遷出的slot數量
def get_migrated_slot(list_master_node,n):
    migrated_slot_count = int(16384/len(list_master_node)) - int(16384/(len(list_master_node)+n))
    return migrated_slot_count

def redis_cluster_expansion(list_master_node,dict_master_node,dict_slave_node):
    new_master_node =  dict_master_node["host"] + ':' + str(dict_master_node["port"])
    new_slave_node = dict_slave_node["host"] + ':' + str(dict_slave_node["port"])

    print("#########################cleanup instance#################################")
    new_master_conn = redis.StrictRedis(host=dict_master_node["host"], port=dict_master_node["port"], password=dict_master_node["password"], decode_responses=True)
    new_master_conn.execute_command('flushall')
    new_master_conn.execute_command('cluster reset')
    new_master_id = new_master_conn.cluster('myid')

    new_slave_conn = redis.StrictRedis(host=dict_slave_node["host"], port=dict_slave_node["port"], password=dict_slave_node["password"], decode_responses=True)
    new_slave_conn.execute_command('cluster reset')
    new_slave_id = new_slave_conn.cluster('myid')
    #new_slave_conn.execute_command('slaveof no one')

    # 判斷新增的節點是否歸屬於當前集群,
    # 如果已經歸屬於當前集群且不占用slot,則先踢出當前集群 cluster forget nodeid,或者終止,給出告警,總之,怎麼開心怎麼來
    # 登錄集群中的任何一個節點
    cluster_node_conn = redis.StrictRedis(host=list_master_node[0]["host"], port=list_master_node[0]["port"], password=list_master_node[0]["password"],decode_responses=True)
    dict_node_info = cluster_node_conn.cluster('nodes'

	
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