关于redis-dump 安装遇到的问题以及解决方案

安装平台: centos7

[root@VM_16_15_centos ~]# redis-dump
-bash: redis-dump: command not found

没有安装这个管理工具【不想看过程的可以看末尾精华版】

因为这个工具是基于Ruby实现的，首先要安装Ruby

一：安装Ruby

参考：Ruby官方

示例：centos (模拟输入和部分输出, 可以在 install前面添加 -y 把后面的手动选择y自动化)

[root@VM_16_15_centos ~]# yum install ruby  
Loaded plugins: fastestmirror, langpacks
Repository epel is listed more than once in the configuration
Loading mirror speeds from cached hostfile

二：尝试安装 redis-dump

[root@VM_16_15_centos ~]# gem install redis-dump
Fetching: yajl-ruby-1.4.1.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing redis-dump:
    ERROR: Failed to build gem native extension.

    /usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /usr/share/include/ruby.h

这里还是报错

我就不说什么原因了，直接开始解决。先安装这个

[root@VM_16_15_centos ~]# yum -y install ruby ruby-devel
Loaded plugins: fastestmirror, langpacks
Repository epel is listed more than once in the configuration
Loading mirror speeds from cached hostfile
Package ruby-2.0.0.648-35.el7_6.x86_64 already installed and latest version
Package ruby-devel-2.0.0.648-35.el7_6.x86_64 already installed and latest version

然后安装这个

[root@VM_16_15_centos ~]# yum -y install rubygems
Loaded plugins: fastestmirror, langpacks
Repository epel is listed more than once in the configuration
Loading mirror speeds from cached hostfile
Package rubygems-2.0.14.1-35.el7_6.noarch already installed and latest version

...暂时先别动，替换下国内源，加个速度，然后再复制它的提示指令继续操作...

替换的指令为

[root@VM_16_15_centos ~]# gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
// 查询状态指令
[root@VM_16_15_centos ~]# gem sources -l
*** CURRENT SOURCES ***

https://gems.ruby-china.com/

然后继续尝试安装

[root@VM_16_15_centos ~]# gem install redis-dump
Fetching: yajl-ruby-1.4.0.gem (100%)
Building native extensions.  This could take a while...
Successfully installed yajl-ruby-1.4.0
Fetching: redis-4.0.1.gem (100%)
ERROR:  Error installing redis-dump:
    redis requires Ruby version >= 2.2.2.

[root@VM_16_15_centos ~]# yum install curl
Loaded plugins: fastestmirror, langpacks
Repository epel is listed more than once in the configuration
Loading mirror speeds from cached hostfile
Package curl-7.29.0-51.el7_6.3.x86_64 already installed and latest version

然后通过上一步安装好的 curl安装下面的这个, 部分提示如下

[root@VM_16_15_centos ~]# curl -L get.rvm.io | bash -s stable
····部分提示如下····
gpg2 --keyserver hkp://pool.sks-keyservers.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB

or if it fails:

    command curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
    command curl -sSL https://rvm.io/pkuczynski.asc | gpg2 --import -

In case of further problems with validation please refer to https://rvm.io/rvm/security

复制它的指令，再继续

[root@VM_16_15_centos ~]# curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
[root@VM_16_15_centos ~]# curl -sSL https://rvm.io/pkuczynski.asc | gpg2 --import -

然后重试，这一步会等比较久

[root@VM_16_15_centos ~]# curl -L get.rvm.io | bash -s stable

这里之后需要使 rvm指令生效

[root@VM_16_15_centos local]# cd /etc/profile.d
[root@VM_16_15_centos local]# ls
这里会看到有个 `rvm.sh` 的文件,然后
[root@VM_16_15_centos profile.d]# source rvm.sh

然后使用一下rvm -v检测 rvm 是否可用

可用的话查看 rvm 里面的支持的东西

[root@VM_16_15_centos ~]# rvm list known

因为安装 那个需要 Ruby 等级大于2.2.2.

我直接安装了 2.3

[root@VM_16_15_centos ~]# rvm install 2.3

安装好了之后就可以安装 redis-dump了

[root@VM_16_15_centos ~]# gem install redis-dump

然后检测成功了吗

[root@VM_16_15_centos ~]# redis-dump
[root@VM_16_15_centos ~]# redis-load
Usage: cat dumpfile_db15.json | redis-load -d 15

看来是成功了,读取一下我存在内存中的 redis内容看看情况

[root@VM_16_15_centos ~]# redis-dump -u localhost:6379
{"db":0,"key":"hello","ttl":-1,"type":"string","value":"nihao","size":5}
{"db":0,"key":"funny","ttl":-1,"type":"string","value":"kaixin","size":6}
{"db":0,"key":"school","ttl":-1,"type":"string","value":"xuexiao","size":7}

大功告成

精华版

[root@VM_16_15_centos ~]# yum install ruby 
[root@VM_16_15_centos ~]# yum -y install ruby ruby-devel
[root@VM_16_15_centos ~]# yum -y install rubygems
[root@VM_16_15_centos ~]# gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
[root@VM_16_15_centos ~]# yum install curl
[root@VM_16_15_centos ~]# curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
[root@VM_16_15_centos ~]# curl -sSL https://rvm.io/pkuczynski.asc | gpg2 --import -
[root@VM_16_15_centos ~]# curl -L get.rvm.io | bash -s stable
[root@VM_16_15_centos local]# cd /etc/profile.d
[root@VM_16_15_centos profile.d]# source rvm.sh
[root@VM_16_15_centos ~]# rvm install 2.3
[root@VM_16_15_centos ~]# gem install redis-dump

redis-dump和redis-load简单的几个操作，具体的去百度就好了

以下小括号内的内容是有密码的时候需要做的事情
redis-dump -u (:password@)localhost:6379    # 导出0-15号数据库数据 
------------------------------------------------------------------------------------
// 全局参数相关：redis-dump [参数] COMMAND [参数及操作]
-u 代表Redis链接字符串  （上面那一条就用的这个）
-d 代表数据库代号
-s 代表导出之后的休眠时间
-c 代表分块大小，默认10000
-f 代表导出时的过滤器
-O 代表禁用运行时优化
-V 显示版本
-D 表示开启调试 
--------------------------------------------------------------------------------------
redis-dump -u localhost:6379 > ./redis_data.jl                         # 导出json
redis-sump -u (:password@)localhost:6379 -d 1 > ./redis_data.jl        # 只导出1号数据库内容
redis-sump -u (:password@)localhost:6379 -f ads1:* > ./redis_data.jl   # 导出以adsl开头的数据, 加入-f参数来过滤
< redis_data.json redis-load -u (:password@)localhost:6379             # 将json文件导入redis数据库
cat redis_data.json | redis-load -u (:password@)localhost:6379         # 同样效果