镜像管理

containerd 使用 ctr 命令，即：containerd CLI

1. ctr images help

root@suaxi:~# ctr images -h
NAME:
   ctr images - Manage images

USAGE:
   ctr images command [command options] [arguments...]

COMMANDS:
   check                    Check existing images to ensure all content is available locally
   export                   Export images
   import                   Import images
   list, ls                 List images known to containerd
   mount                    Mount an image to a target path
   unmount                  Unmount the image from the target
   pull                     Pull an image from a remote
   push                     Push an image to a remote
   prune                    Remove unused images
   delete, del, remove, rm  Remove one or more images by reference
   tag                      Tag an image
   label                    Set and clear labels for an image
   convert                  Convert an image
   usage                    Display usage of snapshots for a given image ref

OPTIONS:
   --help, -h  show help
   

2. 查看镜像

ctr images ls

3. 拉取镜像

containerd 支持 oci 标准的镜像，所以可以直接使用 docker 官方或 dockerfile 构建的镜像。

# 拉取时镜像名需要写全量名称（源 + 镜像名:TAG）
ctr images pull --all-platforms docker.io/library/nginx:alpine

# 拉取指定平台的镜像（x86）
ctr images pull --platform linux/amd64 docker.io/library/nginx:alpine

4. 删除镜像

ctr image rm docker.io/library/nginx:alpine

5. 导出镜像

ctr i export --all-platforms nginx.img docker.io/library/nginx:alpine

6. 导入镜像

# 以上一步导出的 nginx.img 镜像为例
ctr images import nginx.img unpacking docker.io/library/nginx:alpine

7. 修改镜像 tag

# 将 docker.io/library/nginx:alpine 修改为 nginx:alpine-test
ctr images tag docker.io/library/nginx:alpine nginx:alpine-test

修改后检查镜像

ctr images check