Forward Proxy Server Configuration: Python Crawler Distributed Architecture and IP Pool Building Guide

Reptile brothers should know the law of survival!

I've seen too many of my peers fall prey to IP blocking. Yesterday the script was running fine, but today it's suddenly 404. If you don't have a spare IP at hand, the whole project will come to a halt. What we want to talk about today is how to use a distributed architecture + IP pool combination punch, so that the crawler live more tenacious than the small strong.

Three Pain Points of Distributed Crawlers

1. IP blocking is a common occurrence.: Single-IP high-frequency access is equivalent to square dancing in front of the server, if you do not block you block who?

2. Task allocation is easy to fight: more than one crawler to grab work, either duplication of efforts, or miss the capture of data

3. Maintenance costs are more than raising a child: each machine has to be individually configured, and updating a configuration can break your hands.

Hands-On IP Ammunition Depot

Here we recommend the use of ipipgo's residential IP resources, their IP pool has a few points particularly suitable for us to engage in crawlers:

Build a four-step process:

1. Go to the ipipgo website and glean a test account to get your hands on the API key
2. Write an IP freshness script to regularly eliminate old IPs and replenish new stock
3. Get a Redis as an ammo storage for IP+port+expiration time
4. Add an IP rotation module to the crawler code to randomly draw a lucky IP for each request.

Agent practical guide to avoid pitfalls

Don't take the free IP directly to the production environment to dislike, blood lesson! Last week, a brother to save trouble, the result triggered the anti-climbing mechanism, the entire project data all waste. Use ipipgo this kind of professional services to pay attention to:

• Dynamic IPs are suitable for high-frequency operations, such as data scrubbing.
• Save the static IP for operations that require a login state, don't mess around with it!
• Remember to set up timeout retries and automatic switching when the IP fails

Frequently Asked Questions First Aid Kit

Q: What should I do if all the IPs in the IP pool suddenly hang up?
A: Check whether the request frequency is over the limit, use ipipgo's concurrency test function to batch test the surviving IPs, and remember to set up a mix of IPs from different geographic regions.

Q: How can I tell if I should use a residential IP or a server room IP?
A: Residential IPs are more camouflaged but more expensive, suitable for harsh anti-climbing scenarios; server room IPs are faster and suitable for routine collection of large amounts of data.

Q: What should I do if the proxy often times out the connection?
A: Enable the function of automatically rejecting failed nodes in ipipgo background, set a reasonable timeout threshold (3-5 seconds is recommended), and don't forget to add random delay to the retry mechanism.

Say something from the heart.

I've seen too many people spend their energy on anti-anti-crawling strategies, but neglected the most basic IP management. Use a good proxy IP is like playing a game to open the plug-in, the key is to choose the right equipment. ipipgo's global node coverage is really able to play, especially their intelligent routing function, can automatically match the optimal line, this in the actual combat can save a lot of things.

Finally, I would like to remind you that distributed crawlers are not silver bullets, they have to work with a healthy IP pool to be powerful. Next time you encounter anti-climbing don't rush to change the code, first see if the IP policy should be upgraded. Remember:A good IP resource is a life-sustaining elixir for crawler engineersThe