March 14, White Day.
In Japan, the woman who wants to confess will usually give a gift to the person she likes on Valentine's Day (February 14th), and the person who receives the gift will return the gift on March 14th and tell the woman her heart.
In China, on the contrary, on Valentine's Day, March 14, it is the woman's turn to give gifts to the man.
Looking back at dusk, I want to sprinkle dog food~! Ha ha!
Who and who is the most beautiful CP in CDN? Let's take a guess~!
friend
The editor believes that the most beautiful CP combination in CDN is CDN and origin site. Without an origin site, CDNs cannot lay eggs! Without a CDN, an egg cannot hatch a chicken. This is not rude! Think about it, is this the truth? ! If there is no source site, where will the content come from, CDN is nothing. If there is no CDN's branches and leaves, this egg is just an egg, and it can't travel around the world. If you want to buy a JD Chocolate for the festival, all JD pages without CDN acceleration will be stuck and blank, so you have to spend the White Screen Festival with a white screen~!
fall in love
Of course it's Valentine's Day~! It's not the couple's day, so this pair of CPs will also bloom N flowers. If there is only one origin site, and the CDN server spreads all over the world, it is naturally a one-to-many relationship, with three thousand pets in one! However, human beings are smart and do not like to put good things in only one basket. Therefore, there will be thousands of pets in the N body. In other words, there are multiple source stations for each other. In this case , CDN can poll different origin site IPs for back-to-origin, but this hides a problem. If one of the N origin site IPs is disconnected from the network, or the server is down, wouldn't there be a 1/N response? Will the source fail? Yes, this will happen! How to solve it? Hey, we need to introduce an advanced product, ITM (Iintelgence Traffic Managment) intelligent traffic scheduling system. This system can monitor the survival status of the origin site and dynamically adjust DNS resolution. Please see the active and standby examples below~!
1. Under normal circumstances: IP2 is the main source station, and IP1 is the backup source station. When the main source station is alive, only the IP2 of the main station is resolved.
2. When the IP-2 service is down , resolve to IP -1
3. The IP -2 service is restored, and the resolution returns to IP-2