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Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.Printing the screenshot above, we can see that the subscriber receives every message from the publisher. However, for Xiao Hong, she only wants to receive messages with red color and does not want to receive messages with black color. Therefore, we need to make the following modifications to the code. We can first add a key so that the subscriber can only subscribe to messages of interest to herself. The code is as follows:讲述了上世纪80年代，在胡八一、王凯旋与Shirly杨即将前往美国的前夕，三人一起回到曾经下乡插队的东北参加好友燕子的婚礼。不料却意外卷入了一场生死冒险，三位摸金校尉过五狱，闯六道，最终找到幕后真凶，拯救了受害的村民们的故事。他对西楚国的关注超过了很多人，所以有任何的风吹草动，都有人禀报给他。赵锋听了头皮发麻，连连摆手道：两个人一起上，算啥本事。《嘟嘟小日记》讲述了嘟嘟在日常生活中遇到的各种趣事，通过这些故事向小朋友提供安全，科学，行为素质等方面的知识。