Suppose you are a sister, you have a boyfriend, the same time you and ambiguous Another guy, better than friends, but not lovers. You can always dump current boyfriend, another can immediately fill. This is a cold backup .
Suppose you are a sister, and while the two men in a relationship, you two are boyfriend. And they also interfered with each other independently. This is the hot backup .
Suppose you are a sister, a boyfriend to give you uneasy sense of security. In the distant boyfriend unknown place, and a boy kept in touch, you tell him you do not have a boyfriend, you are now in the tangle of, once you and your boyfriend separated, you can immediately put their feelings transferred to different places where men go with. This is the off-site disaster recovery .
Suppose you are a sister, have a boyfriend, you have paid the money to a marriage agency, let him help you look good resources, once you and your boyfriend the separate marriage agency immediately to make arrangements for resources, you feelings of uninterrupted operation, which is cloud backup . . . .
Suppose you are a sister, you suspect your boyfriend's loyalty, a treasure in the purchase of a loyalty test services. This is a disaster drill . Friendly reminder, in the absence of backup, disaster drills should not be that bad data will make you lose everything.
Suppose you are a sister, you and your boyfriend long distance relationship, you call every night Chagang, and asked him still loved you, and is called the ping .
Suppose you are a sister, your boyfriend often disappeared, so you want to always grasp his whereabouts, you called him good-based Friends of A, A say good-based Friends of B know, B said that based Friends of C know, C said D-based Friends know, your boyfriend says D are Internet cafes to play games, you finally know where her boyfriend, called TraceRoute .
Suppose you are a sister, your boyfriend addicted to the game often does not answer the phone down for no reason, so when you made an appointment to go shopping in the afternoon from time to time you have to make a phone call to ask, see if he can provide normal service, called Heart Rate Monitor .
Suppose you are a sister, you want to go shopping and your boyfriend A playing games do not answer the phone, shopping Ever since you put the request to the bench boyfriend B, in order to guarantee uninterrupted service operation, called failover.
Suppose you are a sister, you have a lot of things you need to complete a boyfriend, and thus you can not go shopping with a meal A tour description, and B can only accompany you shopping, can not have all the right boyfriend, called master-slave configuration master-slave .
Suppose you are a sister, you lag behind the others too much, that your boyfriend simply too much, so you call to find two boyfriends, one hundred thirty-five single number, two hundred forty-six pairs number lines, thereby reducing the pressure faced by a boyfriend , called negative load balancing. Java back-end number of public attention, had a lot of Nginx load balancing related articles, welcome to view the article in learning about history.
Suppose you are a sister and her boyfriend have more, with the heartbeat detection with failover and load balancing will reach the ultimate experience, called cluster LVS , noted that when the case may demand a stand-alone treatment is not recommended to enable clustering, will cause a lot idle resources, increase maintenance costs.
Suppose you are a sister, your increasingly high demand led to a boyfriend cluster has been unable to deal with the reason that you has added several other, called multi-cluster lateral expansion capacity , referred to as multi-cluster grid.
假设你是个妹子，你的男朋友身体瘦弱从而无法满足需求，于是乎你买了很多大补产品帮你男朋友升级，从而提高单机容量，这叫纵向扩容，Scale up。切记，纵向扩容的成本会越来越高而效果越来越不明显。
假设你是个妹子，你跟男友经常出去游玩，情到深处想做点什么的时候却苦于没有tt，要去超市购买，于是乎你在你们经常去的地方都放置了tt，从而大幅度降低等待时间，这叫CDN。
假设你是个妹子,你的男朋友英俊潇洒风流倜傥财大气粗对你唯一,于是乎你遭到了女性B的敌视，B会以朋友名义在周末请求你男朋友修电脑,修冰箱,占用男朋友大量时间,造成男朋友无法为你服务,这叫拒绝服务攻击,简称DOS。
假设你是个妹子,你因男朋友被一位女性敌视,但是你男朋友的处理能力十分强大,处理速度已经高于她的请求速度,于是她雇佣了一票女性来轮流麻烦你的男朋友,这叫分布式拒绝服务攻击,简称DDOS。
假设你是个妹子，你发现男朋友总是在处理一些无关紧要的其它请求，于是乎你给男朋友了一个白名单,要求他只处理白名单内的请求，而拒绝其它身份不明的人的要求,这叫访问控制。
假设你是个妹子，你男朋友风流倜傥，你总担心他出轨，于是你在他身上安装了一个窃听 器，里面内置了一些可疑女生勾搭行为的特征库，只要出现疑似被勾搭的情况，就会立刻向你报警，这叫入侵检测系统（IDS）。
假设你是个妹子，你改良了上面的窃听 器，当可疑女性对你男朋友做出勾搭行为的时候，立刻释放1万伏电压，把可疑人击昏，终止这次勾搭。这叫入侵防御系统（IPS）。
假设你是个妹子，虽然你装了各种窃听 器、报警器，可是你蓝朋友处处留情，报警器响个不停，让你应接不暇，疲于奔命，于是你搞了个装置集中收集这些出轨告警，进行综合分析，生成你男朋友的出轨报告。这叫SIEM或者SOC。
假设你是个妹子，你把男朋友的出轨报告提交给他父母，得到了他们的大力支持，男友父母开始对他严加管教、限期整改，为你们的爱情保驾护航，做到合情合理、合法合规，这叫等级保护。
假设你是个妹子，你离男朋友家有点远，你开车去，这叫自建专线，你打车过去，这叫租用专线，你骑摩拜单车过去，这叫SDWAN。
假设你是个妹子，你和男朋友的恋爱遭到了双方家长的反对，不准双方往来，你们偷偷挖了一条隧道，便于进行幽会，这叫VPN。
假设你是个妹子，你的男朋友太优秀而造人窥视，于是乎它们研究了一下你的男朋友，稍微修改了一点点生产出一个男朋友B，与你的男朋友百分制99相似，这不叫剽窃，这叫逆向工程,比如男朋友外挂。
假设你是个妹子，你要求你的男朋友坚持十分钟，然后十五分钟继而二十分钟，以测试你男朋友的极限在哪里，这叫压力测试。
假设你是个妹子，为了保证你男朋友的正常运行，于是乎你每天查看他的微信微博等社交资料来寻找可能产生问题的线索，这叫数据分析。
假设你是个妹子，你的男朋友属于社交活跃选手，每天的微博知乎微信生产了大量信息，你发现自己的分析速度远远低于他生的速度，于是乎你找来你的闺蜜一起分析，这叫并行计算。
假设你是个妹子，你的男朋友太能折腾处处留情产生了天量的待处理信息，你和你的闺蜜们已经累趴也没赶上他创造的速度，于是你付费在知乎上找了20个小伙伴帮你一起分析，这叫云计算。
假设你是个妹子，你在得到男朋友经常出没的地点后，根据酒店，敏感时间段等信息确定男朋友因该是出轨了，这叫数据挖掘。
假设你是个妹子，在分析男友的数据后，得知他下午又要出去开房，于是乎你在他准备出门前给他发了个短信，问他有没有带tt，没有的话可以在我这里买，这叫精准推送，需要配合数据挖掘。
假如你是个妹子，你的男朋友总该出去浪而各种出问题，于是乎你租了间屋子并准备好了所有需要的东西并告诉他，以后不用找酒店了，直接来我这屋子吧，什么都准备好了，这叫容器。
假如你是个妹子，你每天都要和男朋友打通一次接口，采集数据。你一天24小时不停地采，这叫实时数据采集。你决定开发新的接口来和男朋友交流，这叫虚拟化。你决定从不同的男友身上采集数据，你就是大数据中心。有一天你决定生一个宝宝，这叫大数据应用。宝宝生下来不知道是谁的，这叫大数据脱敏。但是从宝宝外观来看，黑色皮肤金色头发，这叫数据融合跨域建模。你决定把这个宝宝拿来展览收点门票，这叫大数据变现。来自@彩色郁金香
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作者：张升、古的白等
[1] www.zhihu.com/question/263789393/answer/274245200
[2] www.zhihu.com/question/33749599/answer/57299352
[3] www.zhihu.com/people/guo-yan-20-5/activities
[4] www.zhihu.com/people/cai-se-yu-jin-xiang/activities