Virtual ip address: the principle of virtual IP and the application of the program in load balancing

What the heck is a virtual IP anyway?

The first time many people hear about virtual IPs they think it's a fake address used by hackers, but it's actually aA double hiding behind the serversThe first thing you need to do is to make sure that you have the right number for the phone. To cite a chestnut, your neighborhood property has a switchboard number (equivalent to the real IP), for fear that the phone is broken on a virtual number (virtual IP), outside the people call in automatically transferred to the duty officer's cell phone.

The best part of this technique is thatChange your vest at any time.. For example, with ipipgo's dynamic residential IP, every time you visit the site is like changing a new cell phone number, and will not trigger the platform's wind control at all. There is a friend who does e-commerce with this method, commodity data collection efficiency directly doubled, no longer need to worry about being blocked.

What's Inside Load Balancing

Now a lot of site visits are outrageous, like the double eleven express site. Virtual IP at this time to playIntelligent Sorterrole, dividing the user's request among different servers. But it's not enough to be able to split the delivery, you have to have three watchwords:

1. health checkup: Take the pulse of the server every 5 seconds (e.g. send ICMP packets) and stop sending tasks immediately if you find that it hangs.
2. session hold: Make it so that requests from the same user are always assigned to the same machine, like fixing the waiter after ordering at a restaurant.
3. traffic scheduling: Automatically adjusts to server pressure and automatically turns on spare tire servers during peak hours.

 Example of using ipipgo API to get proxy IPs
import requests

api_url = "https://api.ipipgo.com/getproxy"
params = {
    "key": "Your API key",
    "protocol": "socks5",
    "count": 10
}
response = requests.get(api_url, params=params)
print(response.json())

Proxy IPs in action

Ordinary users may think that the proxy IP is a tool to change the IP, but in the enterprise-level applications it can play flowers. There is a client who does overseas ad monitoring, and used ipipgo's TK line to get into a tawdry operation:

- Catch competing ads with German IP at 8am
- Noon cuts Japanese IPs to monitor the effect of the placement
- Cut the U.S. IP back to transmit data at night
Rotating 200+ IPs per day, data collection completeness soared from 67% to 98%, and the key was not discovered by the platform.

Special attention should be paid to the selection of agency servicesProtocol supportLike ipipgo supports HTTP/HTTPS/Socks5 full protocols, you can save a lot of things when doing crawler development. Their static residential IP is particularly suitable for the need for long-term login account management, the price is cheaper than similar in the market about 20%.

Why is ipipgo so beatable?

I've used seven or eight proxy services, and I ended up sticking to ipipgo for no reason. Once temporarily to get Brazilian local e-commerce data, their customer service 10 minutes to build an exclusive link, but also teach me how to use!traffic multiplexing functionSaves 30% cost.

There's something to be said for package selection:
- Dynamic standard version for individual users to brush data
- Enterprise Edition with API Priority Dispatch
- Choose $35/month for static IPs for account maintenance
Newcomers are advised to buy the Dynamic Standard Edition first to test the waters, more than 7 yuan 1G traffic enough to use half a month.

Guidelines on demining of common problems

Q: What is the difference between a virtual IP and a proxy IP?
A: Virtual IP is mainly used for server clustering, while proxy IP focuses more on network request forwarding. However, with ipipgo's Enterprise Edition proxy service, the two functions can be combined.

Q: Why does IP switching fail sometimes?
A: Ninety percent is a protocol configuration problem, check if you are using a protocol that is not supported by the website. For example, some APPs can only use socks5, and will jerk with http protocol.

Q: Which package do you recommend for overseas business?
A: Directly on the cross-border line, do not save the money. Previously, some customers are greedy for cheap with ordinary dynamic IP, the results of the data delay is too high, but instead of spending more money.

Finally, a dry tip: when doing large-scale data collection, use the ipipgo API in conjunction with selenium, and remember to set up theRandomized sleep time+request header rotationThe first step is to make sure that you are able to bypass the 99% anti-climbing mechanism. Specific code to achieve their technical small brother can teach hand in hand, than their own blind toss much stronger.