containerd 查看镜像

可以使用 `ctr` 命令来查看 `containerd` 上的镜像。具体步骤如下：

1. 首先，使用 `ctr images ls` 命令来列出所有的镜像。

$ sudo ctr images ls
REF                             TYPE                                      DIGEST                                                                  SIZE     PLATFORMS
docker.io/library/nginx:latest docker.io/docker.io/library/nginx:latest sha256:2f0a200cfa5639f2d08e8c7b19b9a6e6c6a98fb4e00e0f9c69c0e5c1c08b5b3f 132.3 MB linux/amd64

2. 如果需要查看某个具体镜像的详细信息，可以使用 `ctr images inspect` 命令，并指定镜像的 `REF`。

$ sudo ctr images inspect docker.io/library/nginx:latest
{
    "name": "docker.io/library/nginx:latest",
    "labels": {
        "maintainer": "NGINX Docker Maintainers <docker-maint@nginx.com>"
    },
    "target": {
        "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
        "size": 132298408,
        "digest": "sha256:2f0a200cfa5639f2d08e8c7b19b9a6e6c6a98fb4e00e0f9c69c0e5c1c08b5b3f",
        "length": 3,
        "urls": [
            "docker.io/sha256:8f95ef5d7f9111c75f8c6d0f62a8d2f0c4cd7b5f2e4e0e54f7e11f8f517a9b0e"
        ]
    },
    "history": [
        {
            "created": "2021-07-28T21:21:21.931610697Z",
            "created_by": "/bin/sh -c #(nop)  CMD [\"nginx\" \"-g\" \"daemon off;\"]",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:21:21.931610697Z",
            "created_by": "/bin/sh -c #(nop)  STOPSIGNAL SIGQUIT",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:21:21.931610697Z",
            "created_by": "/bin/sh -c #(nop)  EXPOSE 80",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:21:21.931610697Z",
            "created_by": "/bin/sh -c #(nop)  ENTRYPOINT [\"docker-entrypoint.sh\"]",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:21:21.931610697Z",
            "created_by": "/bin/sh -c #(nop)  USER nobody",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:21:21.931610697Z",
            "created_by": "/bin/sh -c #(nop)  CMD [\"/bin/sh\"]",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:20:57.750174824Z",
            "created_by": "/bin/sh -c #(nop) COPY file:4b2aed7f4e0f0d8ee9f2934b2d1b3df7e1e1a6f8a4b1cd2a0340c2a8b76c2d3b in /",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:20:57.546135745Z",
            "created_by": "/bin/sh -c #(nop)  ENV NGINX_VERSION=1.21.1",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:20:57.546135745Z",
            "created_by": "/bin/sh -c #(nop)  ENV NJS_VERSION=0.6.2",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:20:57.546135745Z",
            "created_by": "/bin/sh -c #(nop)  LABEL maintainer=NGINX Docker Maintainers <docker-maint@nginx.com>",
            "created_by_platform": "linux/amd64"
        },
        {
            "created": "2021-07-28T21:20:57.546135745Z",
            "created_by": "/bin/sh -c #(nop)  CMD [\"bash\"]",
            "created_by_platform": "linux/amd64"
        }
    ]
}

这样，就可以使用 `ctr` 命令来查看 `containerd` 上的镜像了。