Microk8s.ctr命令行与containerd使用

Microk8s.ctr是用于microk8s下的容器管理（containerd，https://containerd.io）的命令，下面来探索一下其参数。

主要命令

ubuntu@ubuntu:/etc/systemd/system$ sudo microk8s.ctr 
NAME:
   ctr - 
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containerd CLI


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

VERSION:
   v1.2.5

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     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
     shim                      interact with a shim directly
     cri                       interact with cri plugin
     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")
   --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

查看容器镜像

ubuntu@ubuntu:/etc/systemd/system$ sudo microk8s.ctr images
NAME:
   ctr images - manage images

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

COMMANDS:
     check       check that an image has all content available locally
     export      export an image
     import      import images
     list, ls    list images known to containerd
     pull        pull an image from a remote
     push        push an image to a remote
     remove, rm  remove one or more images by reference
     label       set and clear labels for an image

OPTIONS:
   --help, -h  show help
   
ubuntu@ubuntu:/etc/systemd/system$ sudo microk8s.ctr images ls
REF TYPE DIGEST SIZE PLATFORMS LABELS 

查看容器实例

ubuntu@ubuntu:/etc/systemd/system$ sudo microk8s.ctr containers ls
CONTAINER    IMAGE    RUNTIME    
ubuntu@ubuntu:/etc/systemd/system$ sudo microk8s.ctr containers
NAME:
   ctr containers - manage containers

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

COMMANDS:
     create           create container
     delete, del, rm  delete one or more existing containers
     info             get info about a container
     list, ls         list containers
     label            set and clear labels for a container

OPTIONS:
   --help, -h  show help

更多参考

• ContainerD官网，https://containerd.io
• ContainerD快速入门，https://containerd.io/docs/getting-started/
• 高性能容器伺服器-containerd简介
• MicroK8s 快速入门
• MicroK8s-部署到Windows、macOS和Raspberry Pi
• k3s/k3OS-轻量级Kubernetes及操作系统