Docker快速搭建Redis集群的方法示例

2023-07-25 10:26:04 78

什么是Redis集群

Redis集群是Redis提供的分布式数据库方案，集群通过分片（sharding）来进行数据共享，并提供复制和故障转移功能。

节点

一个Redis集群通常由多个节点（node）组成，在刚开始的时候，每个节点都是相互独立的，它们都处于一个只包含自己的集群当中，要组建一个真正可工作的集群，我们必须将各个独立的节点连接起来，构成一个包含多个节点的集群。

集群配置

配置文件

下载配置文件：https://raw.githubusercontent.com/antirez/redis/5.0/redis.conf

调整CLUSTER节点配置

#开启cluster集群
cluster-enabledyes

#集群配置文件
cluster-config-filenodes-6379.conf

#集群节点超时
cluster-node-timeout15000

Docker快速搭建Redis集群

安装Redis

参考文章：https://www.nhooo.com/article/150054.htm

准备工作

├──conf
│├──redis.conf
│└──sentinel.conf
├──redis
│├──data_6379
│├──data_6380
│├──data_6381
│├──data_6382
│├──data_6383
│└──data_6384
└──scripts
├──cluster.sh
├──run.sh
└──sentinel.sh

run.sh脚本文件

#!/usr/bin/envbash
set-e

#脚本当前目录
cPath=$(cd$(dirname"$0")||exit;pwd)

#根目录
dirPath=$(dirname"$cPath")

#获取端口
port="$1"
if[[!"$port"]];then
port=6379
fi

#创建数据目录
mkdir-p"$dirPath"/redis/data_"$port"

#删除已启动服务
containerId=$(dockerps-a|grep"redis_$port"|awk-F'''{print$1}')
if[["$containerId"]];then
dockerrm-f${containerId}>/dev/null
fi

#启动服务
containerName=redis_"$port"
dockerrun-itd--privileged=true-p"$port":6379--name${containerName}\
-v="$dirPath"/conf/redis.conf:/etc/redis/redis.conf\
-v="$dirPath"/redis/data_"$port":/data\
redis\
redis-server/etc/redis/redis.conf>/dev/null

#获取容器IP地址
dockerIp=$(dockerinspect-f"{{.NetworkSettings.IPAddress}}""$containerName")

#获取容器启动状态
isRunning=$(dockerinspect-f"{{.State.Running}}""$containerName")
if[["$isRunning"=="true"]];then
echo"容器：$containerName-IP：$dockerIp-启动成功"
fi

cluster.sh脚本文件

#!/usr/bin/envbash
set-e

#脚本当前目录
cPath=$(cd$(dirname"$0")||exit;pwd)

#启动集群数量
num="$1"
if[[!"$num"]];then
num=6
fi

sPort=6378
for((i=1;i<=$num;i++));do
sh${cPath}/run.sh$(($sPort+$i))
done

启动服务

执行脚本文件，默认创建6个节点

shscripts/cluster.sh

脚本返回结果

容器：redis_6379-IP：172.17.0.2-启动成功
容器：redis_6380-IP：172.17.0.3-启动成功
容器：redis_6381-IP：172.17.0.4-启动成功
容器：redis_6382-IP：172.17.0.5-启动成功
容器：redis_6383-IP：172.17.0.6-启动成功
容器：redis_6384-IP：172.17.0.7-启动成功

执行dockerps确实是否启动成功

root@DESKTOP-Q13EI52:~/docker-config/redis#dockerps
CONTAINERIDIMAGECOMMANDCREATEDSTATUSPORTSNAMES
c0601df1a456redis"docker-entrypoint.s…"27secondsagoUp26seconds0.0.0.0:6384->6379/tcpredis_6384
6fecf70465b8redis"docker-entrypoint.s…"27secondsagoUp26seconds0.0.0.0:6383->6379/tcpredis_6383
1af15e90b7a0redis"docker-entrypoint.s…"28secondsagoUp27seconds0.0.0.0:6382->6379/tcpredis_6382
6c495f31a5dfredis"docker-entrypoint.s…"28secondsagoUp28seconds0.0.0.0:6381->6379/tcpredis_6381
e54fd9fd0550redis"docker-entrypoint.s…"29secondsagoUp28seconds0.0.0.0:6380->6379/tcpredis_6380
be92ad2f7046redis"docker-entrypoint.s…"29secondsagoUp29seconds0.0.0.0:6379->6379/tcpredis_6379

到此为止，6个独立集群节点创建完毕，目前还无法正常工作。

创建集群

此处可以跳过，本人是为了省事

获取容器为redis_开始所有的容器IP地址

dockerinspect-f"{{.NetworkSettings.IPAddress}}:6379"`dockerps|grepredis_|awk-F'''{print$1}'`|sort|xargs|sed's//,/g'

#返回结果
#172.17.0.2:6379,172.17.0.3:6379,172.17.0.4:6379,172.17.0.5:6379,172.17.0.6:6379,172.17.0.7:6379

初次创建集群执行

./redis-cli--clustercreate172.17.0.2:6379,172.17.0.3:6379,172.17.0.4:6379,172.17.0.5:6379,172.17.0.6:6379,172.17.0.7:6379--cluster-replicas1

输出结果

licas1
>>>Performinghashslotsallocationon6nodes...
Master[0]->Slots0-5460
Master[1]->Slots5461-10922
Master[2]->Slots10923-16383
Addingreplica172.17.0.6:6379to172.17.0.2:6379
Addingreplica172.17.0.7:6379to172.17.0.3:6379
Addingreplica172.17.0.5:6379to172.17.0.4:6379
M:e8da1fef656984de3ec2a677edc8d9c48d01cd95172.17.0.2:6379
slots:[0-5460](5461slots)master
M:68b925ab0fbbc1a632c1754587fb6dad3fa14c91172.17.0.3:6379
slots:[5461-10922](5462slots)master
M:0a46ab2f6d176738b55fe699c2df1c34f8200d06172.17.0.4:6379
slots:[10923-16383](5461slots)master
S:bd3064ad5297dfc258e9236943455c589be8b2a3172.17.0.5:6379
replicates0a46ab2f6d176738b55fe699c2df1c34f8200d06
S:f1d8c897882d29e6538b1158525493b3b782289a172.17.0.6:6379
replicatese8da1fef656984de3ec2a677edc8d9c48d01cd95
S:619e1cb52f39e07b321719b77fc3631fa6293cef172.17.0.7:6379
replicates68b925ab0fbbc1a632c1754587fb6dad3fa14c91
CanIsettheaboveconfiguration?(type'yes'toaccept):

输入：yes，将平均分配槽位

>>>Nodesconfigurationupdated
>>>Assignadifferentconfigepochtoeachnode
>>>SendingCLUSTERMEETmessagestojointhecluster
Waitingfortheclustertojoin
.....
>>>PerformingClusterCheck(usingnode172.17.0.2:6379)
M:e8da1fef656984de3ec2a677edc8d9c48d01cd95172.17.0.2:6379
slots:[0-5460](5461slots)master
1additionalreplica(s)
S:f1d8c897882d29e6538b1158525493b3b782289a172.17.0.6:6379
slots:(0slots)slave
replicatese8da1fef656984de3ec2a677edc8d9c48d01cd95
S:bd3064ad5297dfc258e9236943455c589be8b2a3172.17.0.5:6379
slots:(0slots)slave
replicates0a46ab2f6d176738b55fe699c2df1c34f8200d06
M:0a46ab2f6d176738b55fe699c2df1c34f8200d06172.17.0.4:6379
slots:[10923-16383](5461slots)master
1additionalreplica(s)
S:619e1cb52f39e07b321719b77fc3631fa6293cef172.17.0.7:6379
slots:(0slots)slave
replicates68b925ab0fbbc1a632c1754587fb6dad3fa14c91
M:68b925ab0fbbc1a632c1754587fb6dad3fa14c91172.17.0.3:6379
slots:[5461-10922](5462slots)master
1additionalreplica(s)
[OK]Allnodesagreeaboutslotsconfiguration.
>>>Checkforopenslots...
>>>Checkslotscoverage...
[OK]All16384slotscovered.

连接集群

通过客户端连接

redis-cli-c<端口>

执行命令：clusterinfo

127.0.0.1:6379>clusterinfo
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:104
cluster_stats_messages_pong_sent:120
cluster_stats_messages_sent:224
cluster_stats_messages_ping_received:115
cluster_stats_messages_pong_received:104
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:224

看到：cluster_state:ok说明集群已可以正常工作

客户端控制台：clusterhelp

127.0.0.1:6379>clusterhelp
1)CLUSTERargarg...arg.Subcommandsare:
2)ADDSLOTS[slot...]--Assignslotstocurrentnode.
3)BUMPEPOCH--Advancetheclusterconfigepoch.
4)COUNT-failure-reports--Returnnumberoffailurereportsfor.
5)COUNTKEYSINSLOT-Returnthenumberofkeysin.
6)DELSLOTS[slot...]--Deleteslotsinformationfromcurrentnode.
7)FAILOVER[force|takeover]--Promotecurrentreplicanodetobeingamaster.
8)FORGET--Removeanodefromthecluster.
9)GETKEYSINSLOT--Returnkeynamesstoredbycurrentnodeinaslot.
10)FLUSHSLOTS--Deletecurrentnodeownslotsinformation.
11)INFO-Returninformationaboutthecluster.
12)KEYSLOT--Returnthehashslotfor.
13)MEET[bus-port]--Connectnodesintoaworkingcluster.
14)MYID--Returnthenodeid.
15)NODES--Returnclusterconfigurationseenbynode.Outputformat:
16)...
17)REPLICATE--Configurecurrentnodeasreplicato.
18)RESET[hard|soft]--Resetcurrentnode(default:soft).
19)SET-config-epoch-Setconfigepochofcurrentnode.
20)SETSLOT(importing|migrating|stable|node)--Setslotstate.
21)REPLICAS--Returnreplicas.
22)SAVECONFIG-Forcesavingclusterconfigurationondisk.
23)SLOTS--Returninformationaboutslotsrangemappings.Eachrangeismadeof:
24)start,end,masterandreplicasIPaddresses,portsandids

查看客户端提供的集群相关命令：redis-cli--clusterhelp

ClusterManagerCommands:
createhost1:port1...hostN:portN
--cluster-replicas
checkhost:port
--cluster-search-multiple-owners
infohost:port
fixhost:port
--cluster-search-multiple-owners
reshardhost:port
--cluster-from
--cluster-to
--cluster-slots
--cluster-yes
--cluster-timeout
--cluster-pipeline
--cluster-replace
rebalancehost:port
--cluster-weight
--cluster-use-empty-masters
--cluster-timeout
--cluster-simulate
--cluster-pipeline
--cluster-threshold
--cluster-replace
add-nodenew_host:new_portexisting_host:existing_port
--cluster-slave
--cluster-master-id
del-nodehost:portnode_id
callhost:portcommandargarg..arg
set-timeouthost:portmilliseconds
importhost:port
--cluster-from
--cluster-copy
--cluster-replace

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Docker快速搭建Redis集群的方法示例

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