How Docker Container Security Actually Works and Where It Falls Short

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Docker containers are isolated by default but not inherently secure, relying on Linux kernel features such as namespaces, cgroups, capabilities, seccomp, and AppArmor or SELinux to enforce boundaries. Namespaces give each container a private view of processes, networking, and the filesystem, yet all containers share the same underlying kernel, meaning a serious kernel vulnerability could affect the host. Without resource limits via cgroups, a single container can exhaust CPU, memory, or disk I/O on the host machine. Many containers run as root by default, and misuse of flags like --privileged can significantly weaken isolation protections. Security best practices include running containers as non-root users, applying custom seccomp profiles, and setting explicit resource limits to reduce the overall attack surface.

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