Centos7 build redis cluster (optimized version, pro-test passed)

One, install redis

The installation of the cluster requires Ruby commands, so we need to install Ruby, just find one to execute it in the cluster machine

yum install ruby //安装ruby
yum install rubygems //install rubygems, the latest version will be installed automatically
gem install redis

After the execution is complete, you will find an error

，

The minimum Ruby version required by redis is 2.2.2, but the version of ruby in the CentOS7 yum library supports up to 2.0.0,

View Ruby version command: ruby --version

But gem installation redis needs at least 2.2.2, use rvm to update ruby:

Install RVM
1. curl -L get.rvm.io | bash -s stable
2. find / -name rvm -print (There may be a problem at this time)
4. If the above information does not appear, execute the command as shown in the figure below, and execute the command as shown in the figure above.
5. After the above command is executed, continue to execute find / -name rvm -print, you can see the correct screenshot above
Make the newly installed rvm effective immediately
1. source /usr/local/rvm/scripts/rvm
View the ruby version in the rvm library
1. rvm list known
Install a ruby version
1. ```
rvm install 2.4.1
```
Use a ruby version
1. ```
rvm use 2.4.1
```
Set default version
1. ```
rvm use 2.4.1 --default
```

Uninstall a known version

rvm remove 版本号

比如原来的ruby版本如下：那么删除命令为：rvm remove 2.0.0p648

View ruby version
1. ```
ruby --version
```
So far, the new version of ruby is installed, let me continue to install redis execution command
```
gem install redis
```

2. Download the redis source code package and unzip it

wget http://download.redis.io/releases/redis-3.2.4.tar.gz
tar -zxvf redis-3.2.4.tar.gz
cd redis-3.2.4

3. Install redis

make
make install PREFIX=/usr/local/redis
cp redis.conf /usr/local/redis/bin/redis.conf
chmod 777 /usr/local/redis/bin/redis.conf

4. Start redis (this is a stand-alone test, it can be skipped only to build a cluster)

./redis-server redis.conf

5. Verification (this is a stand-alone test, it can be skipped only to build a cluster)

[root@host-172-16-80-177 bin]# ./redis-cli -p 6379
127.0.0.1:6379> get
(error) ERR wrong number of arguments for 'get' command
127.0.0.1:6379> set aa hzb
OK
127.0.0.1:6379> get aa
"hzb"

2. Build a redis cluster (cluster mode)

1. Create a redis-cluster directory under /usr/local/

mkdir -p /usr/local/redis-cluster

2. Copy the /usr/local/redis/bin directory to redis-cluster and rename it to redis1

cd /usr/local
cp -r redis/bin redis-cluster/redis1

3. Copy 3 copies of redis1 in the same directory and name them redis2, redis3, redis4, redis5, redis6 (you must have more than 6 nodes to create a cluster)


cd /usr/local/redis-cluster
[root@host-172-16-80-177 redis-cluster]# pwd
/usr/local/redis-cluster
[root@host-172-16-80-177 redis-cluster]# cp -r redis1 redis2
[root@host-172-16-80-177 redis-cluster]# cp -r redis1 redis3
[root@host-172-16-80-177 redis-cluster]# cp -r redis1 redis4
[root@host-172-16-80-177 redis-cluster]# cp -r redis1 redis5
[root@host-172-16-80-177 redis-cluster]# cp -r redis1 redis6

Respectively modify to redis-7001.conf, redis-7002.conf followed by redis-7006.conf (it is better to download to the local, modify and upload)

Take redis-7001 as an example:

daemonize yes 
bind 192.168.65.130          #（外部可访问IP）
Port 7001
logfile "./redis-7001.log"
databases 1
protected-mode no
pidfile /var/run/redis_7001.pid
cluster-enabled yes

4. Copy redis-trib.rb to the redis-cluster directory

First find the location of redis-trib.rb, knowing the location can save this step

[root@bslsvrnexusp1 bin]# find / -name redis-trib.rb
/usr/local/Redis/redis-3.2.4/src/redis-trib.rb

然后进入redis-cluster文件夹，将redis-trib.rb复制到当前目录中

[root@host-172-16-80-177 redis-cluster]# cp /usr/local/Redis/redis-3.2.4/src/redis-trib.rb .
[root@host-172-16-80-177 redis-cluster]# ll
total 76
drwxr-xr-x 2 root root  4096 Oct 19 22:37 redis1
drwxr-xr-x 2 root root  4096 Oct 19 22:48 redis2
drwxr-xr-x 2 root root  4096 Oct 19 22:49 redis3
drwxr-xr-x 2 root root  4096 Oct 19 22:49 redis4
drwxr-xr-x 2 root root  4096 Oct 19 22:49 redis5
drwxr-xr-x 2 root root  4096 Oct 19 22:49 redis6
-rwxr-xr-x 1 root root 60852 Oct 19 22:52 redis-trib.rb

5. Enter redis1, redis2, redis3, redis4, redis5, redis6 respectively to execute (must follow: enter separately )

./redis-server redis-7001.conf
......

Start 6 nodes

[root@host-172-16-80-177 redis4]# ps -ef|grep redis
root      3167     1  0 02:49 ?        00:00:00 ./redis-server 127.0.0.1:7001 [cluster]
root      3176     1  0 02:50 ?        00:00:00 ./redis-server 127.0.0.1:7002 [cluster]
root      3187     1  0 02:51 ?        00:00:00 ./redis-server 127.0.0.1:7003 [cluster]
root      3191     1  0 02:52 ?        00:00:00 ./redis-server 127.0.0.1:7004 [cluster]
root      3191     1  0 02:52 ?        00:00:00 ./redis-server 127.0.0.1:7005 [cluster]
root      3191     1  0 02:52 ?        00:00:00 ./redis-server 127.0.0.1:7006 [cluster]
root      3195  1852  0 02:52 pts/0    00:00:00 grep redis

6. Build a cluster with redis-trib.rb

cd /usr/local/redis-cluster/

[root@host-172-16-80-177 redis-cluster]# ./redis-trib.rb create --replicas 1 192.168.65.130:7001 
192.168.65.130:7002 192.168.65.130:7003 192.168.65.130:7004 192.168.65.130:7005 192.168.65.130:7006

7. Verify that the cluster is successful

[root@host-172-16-80-177 redis2]# ./redis-cli -h 192.168.65.130 -c -p 7002
192.168.65.130:7002> set hello helloword
-> Redirected to slot [866] located at 172.16.80.177:7001
OK

172.16.80.177:7006> get hello
-> Redirected to slot [866] located at 172.16.80.177:7001
"helloword"

Remarks:

Password setting: Modify the redis-700X.conf file in all Redis clusters. Add:
Add the following two lines in the next line: [port 700X]
masterauth passwd123
requirepass passwd123

After setting a password if you need to use a variety of command redis-trib.rb
such as: ./ redis-trib.rb check 127.0.0.1:7000, it will error ERR] Sorry, can not connect to node 127.0.0.1:7000
solve Method: vim /usr/local/rvm/gems/ruby-2.3.3/gems/redis-4.0.0/lib/redis/client.rb, then modify passord

class Client
    DEFAULTS = {
      :url => lambda { ENV["REDIS_URL"] },
      :scheme => "redis",
      :host => "127.0.0.1",
      :port => 6379,
      :path => nil,
      :timeout => 5.0,
      :password => "passwd123",
      :db => 0,
      :driver => nil,
      :id => nil,
      :tcp_keepalive => 0,
      :reconnect_attempts => 1,
      :inherit_socket => false
    }

Centos7 build redis cluster (optimized version, pro-test passed)

One, install redis

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