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This article uses easy-to-understand examples to introduce what the CVM security group means. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

Cloud security group is a kind of virtual firewall with stateful packet filtering feature, which is used to set network access control for one or more CVMs. It is an important network security isolation means provided by Tencent Cloud.

In fact, not only Tencent CVM, but also many CVM manufacturers have security group rules set for their products.

A security group is a logical grouping. Users can add basic networks, CVMs or ENI instances with the same network security isolation requirements in the same region to the same security group. The inbound and outbound traffic of an instance can be securely filtered through the security group policy. The instance can be a basic network CVM or an ENI instance. The rules of the security group can be modified at any time, and the new rules take effect immediately.

Security group rules control the inbound traffic that is allowed to reach the instance associated with the security group, and the outbound traffic that is allowed to leave the instance (filtering rules from top to bottom). By default, the new security group denies all traffic, and the CVM is bound with an irregular security group to reject all traffic.

The inbound direction of the security group rule indicates that the elastic CVM is accessed externally, and the outbound direction indicates that the elastic CVM accesses the external. After the elastic CVM joins the security group, if there are no rules in the security group, the elastic CVM cannot access the external network, and the external network cannot access the elastic CVM.

The default direction rule of the security group means that the CVM lease can access the outside, and the default inbound direction rule means that the CVM can be accessed by other CVMs in the same security group. It should be noted that security groups cannot solve network failures or network configuration errors. For example, due to network reasons, the two elastic CVMs cannot access each other. Even if the security group rules are configured to allow them to access each other, the two elastic CVMs still cannot communicate.

So much for sharing about the meaning of the CVM security group. I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.

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