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Linux containers have risen in popularity in the last few years, making their way to commercial IT service offerings (such as PaaS), application deployments, and Continuous Delivery/Integration pipelines within various development teams. Along with the wide adoption of Docker, security vulnerabilities and concerns have also surfaced. In this survey, we examine the state of security for the most popular container system at the moment: Docker. We will also look into its origins stemming from the Linux technologies built into the OS itself; examine intrinsic vulnerabilities, such as the Docker Image implementation; and provide an analysis of current tools and modern methodologies used in the field to evaluate and enhance its security. For each section, we pinpoint metrics of interest, as they have been revealed by researchers and experts in the domain and summarize their findings to paint a holistic picture of the efforts behind those findings. Lastly, we look at tools utilized in the industry to streamline Docker security scanning and analytics which provide built-in aggregation of key metrics.