ContainerRun

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ExecuteCreate

runtime.NewContainer

-》libpod/runtime_ctr.go runtime.newContainer
—》libpod/runtime_ctr.go runtime.setupContainer
—-》libpod/container_internal.go setupStorage 创建rootfs目录
——》libpod/storage.go CreateContainerStorage 准备container的work dir和run dir，读取镜像信息来设置container的meta信息，创建writable layer
——-> store.CreateContainer 如果使用image，则找到imageTopLayer。创建writable layer作为容器层。会把所有容器信息写到 containers.json。
———> LayerStore.Create 创建writable layer
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writable layer：

在 /var/lib/containers/storage/overlay/4fa8f612646666389681a590b71ce8fad26675e37580f8a3f99b1e6cce02c8d1/

work dir:

一般用来存储 container log files, files that will be bind mounted into the container (e.g. the resolv.conf we made for the container), and other per-container content. 但不是rootfs的一部分
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/var/lib/containers/storage/overlay-containers/45553218b7b33eac2afcb7e02660b6582baecb53f55fbceeb0eb2f205a8e542a/userdata

libpod/runtime_ctr.go PrepareVolumeOnCreateContainer

�-》 libpod/container_internal.go mountStorage 准备rootfs�，这里会解析到rootfsOverlay
—》如果指定了rootfs，设置mountPoint
—》如果没有指定rootfs，执行container.mount得到mountPoint
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Container.Start

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prepareToStart
-> Container.prepare sets up other required resources like net namespaces
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