containerd 像Docker一样丝滑操作镜像
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• 我们知道 Docker CLI 工具提供了需要增强用户体验的功能，containerd 同样也提供一个对应的 CLI 工具：ctr，不过 ctr 的功能没有 docker 完善，但是关于镜像和容器的基本功能都是有的。接下来我们就先简单介绍下 ctr 的使用。
➜ ~ ctr
NAME:
ctr -
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containerd CLI
USAGE:
ctr [global options] command [command options] [arguments...]
VERSION:
v1.5.5
DESCRIPTION:
ctr is an unsupported debug and administrative client for interacting
with the containerd daemon. Because it is unsupported, the commands,
options, and operations are not guaranteed to be backward compatible or
stable from release to release of the containerd project.
COMMANDS:
plugins, plugin provides information about containerd plugins
version print the client and server versions
containers, c, container manage containers
content manage content
events, event display containerd events
images, image, i manage images
leases manage leases
namespaces, namespace, ns manage namespaces
pprof provide golang pprof outputs for containerd
run run a container
snapshots, snapshot manage snapshots
tasks, t, task manage tasks
install install a new package
oci OCI tools
shim interact with a shim directly
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--debug enable debug output in logs
--address value, -a value address for containerd's GRPC server (default: "/run/containerd/containerd.sock") [$CONTAINERD_ADDRESS]
--timeout value total timeout for ctr commands (default: 0s)
--connect-timeout value timeout for connecting to containerd (default: 0s)
--namespace value, -n value namespace to use with commands (default: "default") [$CONTAINERD_NAMESPACE]
--help, -h show help
--version, -v print the version
镜像操作
拉取镜像
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• 拉取镜像可以使用 ctr image pull 来完成，比如拉取 Docker Hub 官方镜像 nginx:alpine，需要注意的是镜像地址需要加上 docker.io Host 地址：
# ctr image pull docker.io/library/nginx:alpine
也可以使用 --platform 选项指定对应平台的镜像。当然对应的也有推送镜像的命令 ctr image push，如果是私有镜像则在推送的时候可以通过 --user 来自定义仓库的用户名和密码。列出本地镜像
# ctr image ls
# ctr image ls -q
使用 -q（--quiet） 选项可以只打印镜像名称
检测本地镜像
ctr image check
REF TYPE DIGEST STATUS SIZE UNPACKED
docker.io/library/nginx:alpine application/vnd.docker.distribution.manifest.list.v2+json sha256:bead42240255ae1485653a956ef41c9e458eb077fcb6dc664cbc3aa9701a05ce complete (7/7) 9.5 MiB/9.5 MiB true
# 主要查看其中的 STATUS，complete 表示镜像是完整可用的状态。重新打标签
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• 同样的我们也可以重新给指定的镜像打一个 Tag：
# ctr image tag docker.io/library/nginx:alpine harbor.k8s.local/course/nginx:alpine
harbor.k8s.local/course/nginx:alpine
# ctr image ls -q
docker.io/library/nginx:alpine
harbor.k8s.local/course/nginx:alpine
删除镜像
# ctr image rm harbor.k8s.local/course/nginx:alpine
harbor.k8s.local/course/nginx:alpine
# ctr image ls -q
docker.io/library/nginx:alpine
加上 --sync 选项可以同步删除镜像和所有相关的资源。将镜像导出为压缩包
# ctr image export nginx.tar.gz docker.io/library/nginx:alpine
从压缩包导入镜像
ctr image import nginx.tar.gzContainerd 像Docker一样丝滑操作镜像
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