Redis單機多節點集羣實驗

第一步：安裝Redis

前面已經安裝過了 不解釋，

Reids安裝包裏有個集羣工具，要複製到/usr/local/bin裏去

cp redis-3.2.9/src/redis-trib.rb /usr/local/bin

 

第二步：修改配置，建立節點

咱們如今要搞六個節點，三主三從，

端口規定分別是7001，7002，7003，7004，7005，7006

咱們先在root目錄下新建一個redis_cluster目錄，而後該目錄下再建立6個目錄，

分別是7001，7002，7003，7004，7005，7006，用來存在redis配置文件；

這裏咱們要使用redis集羣，要先修改redis的配置文件redis.conf

mkdir redis_cluster 新建目錄

[root@localhost ~]# cd redis_cluster/

[root@localhost redis_cluster]# mkdir 7001 7002 7003 7004 7005 7006

[root@localhost redis_cluster]# ll

總用量 0

drwxr-xr-x. 2 root root 6 7月  27 17:18 7001

drwxr-xr-x. 2 root root 6 7月  27 17:18 7002

drwxr-xr-x. 2 root root 6 7月  27 17:18 7003

drwxr-xr-x. 2 root root 6 7月  27 17:18 7004

drwxr-xr-x. 2 root root 6 7月  27 17:18 7005

drwxr-xr-x. 2 root root 6 7月  27 17:18 7006

[root@localhost redis_cluster]# 

 

先複製一份配置文件到7001目錄下

[root@localhost redis_cluster]# cd

[root@localhost ~]# cp redis-3.2.9/redis.conf redis_cluster/7001/

 

咱們修改下這個配置文件

vi redis_cluster/7001/redis.conf

修改一下幾個

port 7001  //六個節點配置文件分別是7001-7006

daemonize yes        //redis後臺運行

pidfile /var/run/redis_7001.pid   //pidfile文件對應7001-7006

cluster-enabled yes   //開啓集羣

cluster-config-file nodes_7001.conf  //保存節點配置，自動建立，自動更新對應7001-7006

cluster-node-timeout 5000    //集羣超時時間，節點超過這個時間沒反應就判定是宕機

appendonly yes   //存儲方式，aof，將寫操做記錄保存到日誌中

 

7001下的修改完後，咱們把7001下的配置分別複製到7002-7006 而後對應的再修改下配置便可；

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7002/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7003/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7004/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7005/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7006/

 

[root@localhost ~]# vi redis_cluster/7002/redis.conf 

[root@localhost ~]# vi redis_cluster/7003/redis.conf 

[root@localhost ~]# vi redis_cluster/7004/redis.conf 

[root@localhost ~]# vi redis_cluster/7005/redis.conf 

[root@localhost ~]# vi redis_cluster/7006/redis.conf 

編輯後面5個配置文件，把 port ，pidfile，cluster-config-file 分別修改下便可；

 

 

第三步：啓動六個節點的redis

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7001/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7002/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7003/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7004/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7005/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7006/redis.conf 

啓動六個節點

[root@localhost ~]# ps -ef | grep redis  

查找下redis進程

root       9501      1  0 17:38 ?        00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]

root       9512      1  0 17:45 ?        00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7002 [cluster]

root       9516      1  0 17:45 ?        00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]

root       9520      1  0 17:45 ?        00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]

root       9524      1  0 17:45 ?        00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7005 [cluster]

root       9528      1  0 17:45 ?        00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]

說明都啓動成功了

 

第四步：建立集羣

redis官方提供了redis-trib.rb工具，第一步裏已經房到裏bin下 ；

可是在使用以前 須要安裝ruby，以及redis和ruby鏈接

yum -y install ruby ruby-devel rubygems rpm-build

gem install redis

 

redis-trib.rb create --replicas 1  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 127.0.0.1:7006

建立集羣

[root@localhost ~]# redis-trib.rb create --replicas 1  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 127.0.0.1:7006

>>> Creating cluster

>>> Performing hash slots allocation on 6 nodes...

Using 3 masters:

127.0.0.1:7001

127.0.0.1:7002

127.0.0.1:7003

Adding replica 127.0.0.1:7004 to 127.0.0.1:7001

Adding replica 127.0.0.1:7005 to 127.0.0.1:7002

Adding replica 127.0.0.1:7006 to 127.0.0.1:7003

M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001

   slots:0-5460 (5461 slots) master

M: d61e66e49e669b99d801f22f6461172696fdd1c9 127.0.0.1:7002

   slots:5461-10922 (5462 slots) master

M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003

   slots:10923-16383 (5461 slots) master

S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004

   replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c

S: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005

   replicates d61e66e49e669b99d801f22f6461172696fdd1c9

S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006

   replicates aa6bc3f1e1174c3a991c01882584707c2408ec18

Can I set the above configuration? (type 'yes' to accept): 

 

從運行結果看 主節點就是7001 7002 7003 從節點分別是7004 7005 7006 

7001分配到的哈希槽是 0-5460

7002分配到的哈希槽是 5461-10922

7003分配到的哈希槽是 10923-16383

 

最後問咱們是否接受上面的設置，輸入yes 就表示接受，咱們輸入yes

而後顯示：

>>> 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 127.0.0.1:7001)

M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001

   slots:0-5460 (5461 slots) master

   1 additional replica(s)

S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006

   slots: (0 slots) slave

   replicates aa6bc3f1e1174c3a991c01882584707c2408ec18

M: d61e66e49e669b99d801f22f6461172696fdd1c9 127.0.0.1:7002

   slots:5461-10922 (5462 slots) master

   1 additional replica(s)

S: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005

   slots: (0 slots) slave

   replicates d61e66e49e669b99d801f22f6461172696fdd1c9

M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003

   slots:10923-16383 (5461 slots) master

   1 additional replica(s)

S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004

   slots: (0 slots) slave

   replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

顯示配置哈希槽，以及集羣建立成功，能夠用了；

 

第五步：集羣數據測試

咱們先鏈接任意一個節點，而後添加一個key：

redis-cli是redis默認的客戶端工具，啓動時加上｀-c｀參數，`-p`指定端口，就能夠鏈接到集羣。 

鏈接任意一個節點端口：

[root@localhost ~]# /usr/local/redis/bin/redis-cli -c -p 7002

127.0.0.1:7002> 

咱們鏈接7002

127.0.0.1:7002> set xxx  'fdafda'

-> Redirected to slot [4038] located at 127.0.0.1:7001

OK

前面說過Redis Cluster值分配規則，因此分配key的時候，它會使用CRC16(‘my_name’)%16384算法，來計算，將這個key 放到哪一個節點，這裏分配到了4038slot 就分配到了7001(0-5460)這個節點上。因此有：

Redirected to slot [4038] located at 127.0.0.1:7001

 

咱們從其餘集羣節點 ，均可以獲取到數據

127.0.0.1:7001> exit

[root@localhost ~]# /usr/local/redis/bin/redis-cli -c -p 7005

127.0.0.1:7005> get xxx

-> Redirected to slot [4038] located at 127.0.0.1:7001

"fdafda"

127.0.0.1:7001> 

 

第六步：集羣宕機測試

假如咱們幹掉一個節點，好比7002 這個主節點

[root@localhost ~]#  ps -ef | grep redis

root       9501      1  0 17:38 ?        00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]

root       9512      1  0 17:45 ?        00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7002 [cluster]

root       9516      1  0 17:45 ?        00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]

root       9520      1  0 17:45 ?        00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]

root       9524      1  0 17:45 ?        00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7005 [cluster]

root       9528      1  0 17:45 ?        00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]

root       9601   2186  0 18:12 pts/0    00:00:00 grep --color=auto redis

[root@localhost ~]# kill -9 9512

[root@localhost ~]#  ps -ef | grep redis

root       9501      1  0 17:38 ?        00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]

root       9516      1  0 17:45 ?        00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]

root       9520      1  0 17:45 ?        00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]

root       9524      1  0 17:45 ?        00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7005 [cluster]

root       9528      1  0 17:45 ?        00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]

root       9603   2186  0 18:12 pts/0    00:00:00 grep --color=auto redis

[root@localhost ~]# 

 

而後再來看下集羣的狀況

redis-trib.rb check 127.0.0.1:7001

>>> Performing Cluster Check (using node 127.0.0.1:7001)

M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001

   slots:0-5460 (5461 slots) master

   1 additional replica(s)

S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006

   slots: (0 slots) slave

   replicates aa6bc3f1e1174c3a991c01882584707c2408ec18

M: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005

   slots:5461-10922 (5462 slots) master

   0 additional replica(s)

M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003

   slots:10923-16383 (5461 slots) master

   1 additional replica(s)

S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004

   slots: (0 slots) slave

   replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

咱們發現 7005原本是從節點，因爲他對應的主節點掛了，就自動變成主節點master，全部會有最後一個說明

 All 16384 slots covered. 全部哈希槽均可覆蓋了； 集羣能夠正常使用；

 

假如咱們把7005也幹掉，試試看

[root@localhost ~]# kill -9 9524

[root@localhost ~]#  ps -ef | grep redis

root       9501      1  0 17:38 ?        00:00:03 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]

root       9516      1  0 17:45 ?        00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]

root       9520      1  0 17:45 ?        00:00:03 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]

root       9528      1  0 17:45 ?        00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]

root       9610   2186  0 18:16 pts/0    00:00:00 grep --color=auto redis

[root@localhost ~]# 

 

查看下集羣狀況

redis-trib.rb check 127.0.0.1:7001

 

這裏咱們發現 出事了，由於主從節點都掛了 因此有一部分哈希槽沒得分配，最後一句

[ERR] Not all 16384 slots are covered by nodes.  沒有安全覆蓋；

因此不能正常使用集羣；