Shulou(Shulou.com)06/02 Report--

(at least 3 master nodes are needed for the cluster to work properly. Here we need to create 6 redis nodes, of which three are master nodes and three are slave nodes. The ip and port correspondence of the corresponding redis nodes are as follows)

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

1. Download redis. Download version 3.0.0 on the official website, 2. 0 before. Which version does not support cluster mode

Wget https://github.com/antirez/redis/archive/3.0.0-rc2.tar.gz

two。 Decompression and installation

Tar-zxvf redis-3.0.0-rc2.tar.gz

Mv redis-3.0.0-rc2.tar.gz / usr/local/redis3.0

Cd / usr/local/redis3.0

Make executes if it reports an error (make MALLOC=libc)

Make install

Errors may be reported at compile time:

Installation error error: jemalloc/jemalloc.h: No such file or directory solution

Error description

Error installing Redis 2.8.18 Times:

Zmalloc.h:50:31: error: jemalloc/jemalloc.h: No such file or directory

Zmalloc.h:55:2: error: # error "Newer version of jemalloc required"

Make [1]: * * [adlist.o] Error 1

Make [1]: Leaving directory `/ data0/src/redis-2.6.2/src'

Make: * * [all] Error 2

Cause analysis

There is a passage in README.

Allocator

-

Selecting a non-default memory allocator when building Redis is done by setting

The `MALLOC` environment variable. Redis is compiled and linked against libc

Malloc by default, with the exception of jemalloc being the default on Linux

Systems. This default was picked because jemalloc has proven to have fewer

Fragmentation problems than libc malloc.

To force compiling against libc malloc, use:

% make MALLOC=libc

To compile against jemalloc on Mac OS X systems, use:

% make MALLOC=jemalloc

Speaking of allocator allocator, if there is an environment variable MALLOC, it will be used to create Redis.

And libc is not the default allocator, the default is jemalloc, because jemalloc has been shown to have fewer fragmentation problems than libc.

But if you don't have jemalloc and you only have libc, of course make goes wrong. So add such a parameter.

Solution.

Make MALLOC=libc

3. Directories required to create a cluster

Mkdir-p / usr.local/cluster

Cd / usr.local/cluster

4. Modify the configuration file redis.conf

Cp / usr/local/redis3.0/redis.conf / usr.local/cluster/

Vim redis.conf

# what needs to be modified # #

Port 7000

Daemonize yes

Cluster-enabled yes

Cluster-config-file nodes.conf

Cluster-node-timeout 5000

Appendonly yes

# # after modifying these configuration items in the redis.conf configuration file, copy the configuration file to the 7000Universe 7001and7002and7003and7004and7005 directory respectively

# # Note: after the copy is completed, modify the port parameter in the redis.conf file under the 7001Universe 7002Universe 7003Universe 7004ax 7005 directory, and change it to the name of the corresponding folder.

5. Start these 6 redis instances respectively

Cd / usr/local/cluster/7000

Redis-server redis.conf

Cd / usr/local/cluster/7001

Redis-server redis.conf

Cd / usr/local/cluster/7002

Redis-server redis.conf

Cd / usr/local/cluster/7003

Redis-server redis.conf

Cd / usr/local/cluster/7004

Redis-server redis.conf

Cd / usr/local/cluster/7005

Redis-server redis.conf

# # use the command to check the startup status of redis after startup ps-ef | grep redis

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

Root 2495 1 0 20:09? 00:00:04 redis-server *: 7000 [cluster]

Root 2505 10 20:10? 00:00:05 redis-server *: 7001 [cluster]

Root 2510 10 20:10? 00:00:04 redis-server *: 7002 [cluster]

Root 2520 1 0 20:13? 00:00:04 redis-server *: 7003 [cluster]

Root 2528 1 0 20:14? 00:00:04 redis-server *: 7004 [cluster]

Root 2534 1 0 20:14? 00:00:04 redis-server *: 7005 [cluster]

Root 2878 1477 0 20:54 pts/0 00:00:00 grep redis

6. Execute the create cluster command of redis to create a cluster

Install the environment and plug-ins needed to create the cluster

Yum install-y ruby

Yum install-y rubygems

Gem install redis (interface between redis and ruby, installed using gem) (this experimental environment can be accessed on the Internet)

Cd / usr/local/redis3.0/src/

. / redis-trib.rb create-- replicas 1 127.0.0.1VR 7000 127.0.0.1V 7001 127.0.0.1V 7002 127.0.0.1R 7003 127.0.1V 7003 127.0.1V 7004 127.0.1V 7005

At this point, the redis cluster is built successfully!

7. Use the redis-cli command to enter the cluster environment

Redis-cli-c-p 7000

Add-c to automatically jump to the corresponding port when the key value entered is not in the specified port.

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