Book source: "CKA/CKAD Test Guide: From Docker to Kubernetes Complete Raiders"
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In order to understand the namespace, we use the usual QQ group as an example, as shown in Figure 3-7.
Usually we can chat without barriers in the QQ group, but the specific people may be distributed in different cities. For example, in Figure 3-7, A, B, and C are in QQ group 1, but they may be in Beijing and Shanghai respectively ,Shenzhen. The three people x, y, and z are in group 2, and they may also be distributed in different cities. QQ group is such a logical structure, different groups are isolated from each other. Although character A and character y are both in Beijing, there is no relationship between them, as shown in Figure 3-8.
A namespace is a logical organization similar to a QQ group. When we enter a namespace, the content we see (such as pods) is actually distributed on different workers, just like the same QQ group. People are distributed in different cities. As an administrator, we only need to operate the pod in a certain namespace, and don't care which worker the pod is running on.