从docker容器实例中的node.js os.cpus（）检索的CPU使用率是否指示主机CPU或容器CPU？

Question

我正在使用os.cpus（）来监视容器实例中的node.js应用程序，但是想知道用法是指示实例的CPU还是docker主机？

Answer 1

For docker containers, there isn't a hard distinction between CPU/mem inside or outside the container like there is virtual machines. Basically, all containers share the same kernel and there isn't a namespace for CPUs or Memory that causes the container to see those differently. Thus, os.cpus() shows the usage information of the host system including all workloads. To see usage information for your containers you can use the docker stats command on the host system. For Node.js, checkout the systeminformation package which also provides usage information for docker containers. However, this is only usable if run on the host (not inside a container)!

See also: https://docs.docker.com/engine/reference/commandline/stats/