一文看懂 Redis5 搭建叢集

Redis · 發表 2018-10-25 17:08:46

摘要： 1、簡要說明 2018年十月 Redis 釋出了穩定版本的 5.0 版本，推出了各種新特性，其中一點是放棄 Ruby的叢集方式，改為使用 C語言編寫的 redis-cli的方式，是叢集的構建方式複雜度大大降低。關於叢集的更新可以在 Redis5 的版本說明中看到，如下： The...

1、簡要說明

2018年十月 Redis 釋出了穩定版本的 5.0 版本，推出了各種新特性，其中一點是放棄 Ruby的叢集方式，改為使用 C語言編寫的 redis-cli的方式，是叢集的構建方式複雜度大大降低。關於叢集的更新可以在 Redis5 的版本說明中看到，如下：

The cluster manager was ported from Ruby (redis-trib.rb) to C code inside redis-cli. check `redis-cli --cluster help ` for more info.

可以檢視Redis官網檢視叢集搭建方式，連線如下

https://redis.io/topics/cluster-tutorial

以下步驟是在一臺 Linux 伺服器上搭建有6個節點的 Redis叢集。

2、操作步驟

1、建立目錄

新建目錄：/root/software/redis

2、下載原始碼並解壓編譯

wget http://download.redis.io/releases/redis-5.0.0.tar.gz
tar xzf redis-5.0.0.tar.gz
cd redis-5.0.0
make

3、建立6個Redis配置檔案

6個配置檔案不能在同一個目錄，此處我們定義如下：

/root/software/redis/redis-cluster-conf/7001/redis.conf
/root/software/redis/redis-cluster-conf/7002/redis.conf
/root/software/redis/redis-cluster-conf/7003/redis.conf
/root/software/redis/redis-cluster-conf/7004/redis.conf
/root/software/redis/redis-cluster-conf/7005/redis.conf
/root/software/redis/redis-cluster-conf/7006/redis.conf

配置檔案的內容為：

port 7001#埠
cluster-enabled yes #啟用叢集模式
cluster-config-file nodes.conf
cluster-node-timeout 5000 #超時時間
appendonly yes
daemonize yes #後臺執行
protected-mode no #非保護模式
pidfile/var/run/redis_7001.pid

其中 port 和 pidfile 需要隨著資料夾的不同調增。

4、啟動節點

/root/software/redis/redis-5.0.0/src/redis-server/root/software/redis/redis-cluster-conf/7001/redis.conf
/root/software/redis/redis-5.0.0/src/redis-server/root/software/redis/redis-cluster-conf/7002/redis.conf
/root/software/redis/redis-5.0.0/src/redis-server/root/software/redis/redis-cluster-conf/7003/redis.conf
/root/software/redis/redis-5.0.0/src/redis-server/root/software/redis/redis-cluster-conf/7004/redis.conf
/root/software/redis/redis-5.0.0/src/redis-server/root/software/redis/redis-cluster-conf/7005/redis.conf
/root/software/redis/redis-5.0.0/src/redis-server/root/software/redis/redis-cluster-conf/7006/redis.conf

5、啟動叢集

/root/software/redis/redis-5.0.0/src/redis-cli --cluster create 192.168.2.40:7001 192.168.2.40:7002 192.168.2.40:7003 192.168.2.40:7004 192.168.2.40:7005 192.168.2.40:7006 --cluster-replicas 1

啟動後，可看到成功資訊，如下：

>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.2.40:7004 to 192.168.2.40:7001
Adding replica 192.168.2.40:7005 to 192.168.2.40:7002
Adding replica 192.168.2.40:7006 to 192.168.2.40:7003
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 191c645200a8b4d267f71e3354c8248dbb533dde 192.168.2.40:7001
slots:[0-5460] (5461 slots) master
M: 400a08d4e5a534c1b609988105d3e045395fbd12 192.168.2.40:7002
slots:[5461-10922] (5462 slots) master
M: 684f6aa0fbccda295ce6818a8c01ee7255a7b002 192.168.2.40:7003
slots:[10923-16383] (5461 slots) master
S: f2701549ae98315b432d73b49d139ee77d5685b4 192.168.2.40:7004
replicates 684f6aa0fbccda295ce6818a8c01ee7255a7b002
S: 9fdc1e375436767ab815cbddd3df674f3bc2ca99 192.168.2.40:7005
replicates 191c645200a8b4d267f71e3354c8248dbb533dde
S: e7742888ed85b37cff4a98e861e99bb16e8bae2c 192.168.2.40:7006
replicates 400a08d4e5a534c1b609988105d3e045395fbd12
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 192.168.2.40:7001)
M: 191c645200a8b4d267f71e3354c8248dbb533dde 192.168.2.40:7001
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 684f6aa0fbccda295ce6818a8c01ee7255a7b002 192.168.2.40:7003
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 9fdc1e375436767ab815cbddd3df674f3bc2ca99 192.168.2.40:7005
slots: (0 slots) slave
replicates 191c645200a8b4d267f71e3354c8248dbb533dde
S: e7742888ed85b37cff4a98e861e99bb16e8bae2c 192.168.2.40:7006
slots: (0 slots) slave
replicates 400a08d4e5a534c1b609988105d3e045395fbd12
M: 400a08d4e5a534c1b609988105d3e045395fbd12 192.168.2.40:7002
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: f2701549ae98315b432d73b49d139ee77d5685b4 192.168.2.40:7004
slots: (0 slots) slave
replicates 684f6aa0fbccda295ce6818a8c01ee7255a7b002
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

至此，Reids5 叢集搭建完成。

本文來自雲棲社群合作伙伴“開源中國”

本文作者：Oo若離oO

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