搭建redis cluster

1. 準備節點

2. 節點間的通訊

3. 分配槽位給節點

redis-cluster架構

多個服務端，負責讀寫，彼此通訊，redis指定了16384個槽。

多匹馬兒，負責運輸資料，馬兒分配16384個槽位，管理資料。

ruby的指令碼自動就把分配槽位這事做了

啟動所有redis-cluster節點

我準備了6個節點, 配置檔案如下, 除了埠不一樣, 其他都一樣

配置檔案解釋:

port 7000
daemonize yes
dir "/opt/redis/data"
logfile "7000.log
 
"
dbfilename "dump-7000.rdb"
cluster-enabled yes   #開啟叢集模式
cluster-config-file nodes-7000.conf　　#叢集內部的配置檔案
cluster-require-full-coverage no　　#redis cluster需要16384個slot都正常的時候才能對外提供服務，換句話說，只要任何一個slot異常那麼整個cluster不對外提供服務。 因此生產環境一般為no

啟動所有的節點

 此時的redis雖然已經啟動了, 但是還不能使用, 因為現在執行在叢集模式下, 叢集還沒有配置完了.....

準備ruby環境

開啟redis-cluster

下載ruby安裝包

#下載ruby
wget https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.1.tar.gz

#安裝ruby
tar -xvf ruby-2.3.1.tar.gz
./configure --prefix=/opt/ruby/
make && make install

#準備一個ruby命令
#準備一個gem軟體包管理命令
#拷貝ruby命令到path下/usr/local/ruby
cp /opt/ruby/bin/ruby /usr/local/bin/
cp bin
 
/gem /usr/local/bin

 安裝gem安裝redis模組, 類似於pip install redis

wget http://rubygems.org/downloads/redis-3.3.0.gem

gem install -l redis-3.3.0.gem

#檢視gem有哪些包
gem list -- check redis gem

安裝redis-trib.rb命令

在redis/src目錄下

 新增到環境變數

[[email protected] 05:15 /opt/redis-4.0.10/src]# cp redis-trib.rb /usr/local/bin/

 一鍵開啟redis-cluster

#每個主節點，有一個從節點，代表--replicas 1
redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005

#叢集自動分配主從關係  7000、7001、7002為 7003、7004、7005 主動關係

[[email protected] 05:15 /opt/redis-4.0.10/src]# redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
Adding replica 127.0.0.1:7004 to 127.0.0.1:7000
Adding replica 127.0.0.1:7005 to 127.0.0.1:7001
Adding replica 127.0.0.1:7003 to 127.0.0.1:7002
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: fb345360da148c168f590237e0c5557815654c34 127.0.0.1:7000
   slots:0-5460 (5461 slots) master
M: 23875b1844fe1af2f5287877298abaf7c8eeaea3 127.0.0.1:7001
   slots:5461-10922 (5462 slots) master
M: 39e2b69102c684c0a4973395acb37120f60db22c 127.0.0.1:7002
   slots:10923-16383 (5461 slots) master
S: 390c6bfbd8fe0a94c37b9b41c45ec0a033c58e85 127.0.0.1:7003
   replicates 39e2b69102c684c0a4973395acb37120f60db22c
S: 115c8166b48a6b2835a5fd89b3bcb021687e64d5 127.0.0.1:7004
   replicates fb345360da148c168f590237e0c5557815654c34
S: 28b7664378d6aea262bc5a9ee890d4a857bf397e 127.0.0.1:7005
   replicates 23875b1844fe1af2f5287877298abaf7c8eeaea3
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 127.0.0.1:7000)
M: fb345360da148c168f590237e0c5557815654c34 127.0.0.1:7000
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
S: 28b7664378d6aea262bc5a9ee890d4a857bf397e 127.0.0.1:7005
   slots: (0 slots) slave
   replicates 23875b1844fe1af2f5287877298abaf7c8eeaea3
M: 23875b1844fe1af2f5287877298abaf7c8eeaea3 127.0.0.1:7001
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 115c8166b48a6b2835a5fd89b3bcb021687e64d5 127.0.0.1:7004
   slots: (0 slots) slave
   replicates fb345360da148c168f590237e0c5557815654c34
S: 390c6bfbd8fe0a94c37b9b41c45ec0a033c58e85 127.0.0.1:7003
   slots: (0 slots) slave
   replicates 39e2b69102c684c0a4973395acb37120f60db22c
M: 39e2b69102c684c0a4973395acb37120f60db22c 127.0.0.1:7002
   slots:10923-16383 (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.

檢視叢集狀態的命令

redis-cli -p 7000 cluster info  

redis-cli -p 7000 cluster nodes  #等同於檢視nodes-7000.conf檔案節點資訊

叢集主節點狀態
redis-cli -p 7000 cluster nodes | grep master
叢集從節點狀態
redis-cli -p 7000 cluster nodes | grep slave

測試叢集

測試寫入叢集資料，登入叢集必須使用redis-cli -c -p 7000必須加上-c引數

 redis叢集部署完成