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Target customers: O&M personnel who need to capture network packets to analyze and locate problems. Features released: When a network exception occurs in a container, you may need to capture network packets to analyze and locate the problem. However, the system may encounter the following problems when the system tries to capture network packets: 1. The system may not be able to use exec to enter the container because the container may not be in the running state when network exceptions occur. 2. Tcpdump may not be pre-installed in the rootfs of the container. The system cannot use tcpdump to capture packets. Elastic Container Instance allows you to easily enable tcpdump to solve the preceding problems.