![]() ![]() Similarly to images, you can list existing containers with: $ ctr containers ls But no port publishing or automatic container restart with -restart=always out of the box. The ctr run command also supports only some of the familiar docker run flags: -env, -t,-tty, -d,-detach, -rm, etc. Notice that unlike user-friendly docker run generating a unique container ID for you, with ctr, you must supply the unique container ID yourself. For instance: $ ctr run -rm -t docker.io/library/debian:latest cont1 Having a local image, you can run a container with ctr run. To remove images using ctr, run: $ ctr images remove docker.io/library/nginx:1.21 $ ctr images mount docker.io/kennethreitz/httpbin:latest /tmp/httpbin With ctr, you can also mount images for future exploration: $ mkdir /tmp/httpbin Instead of building images with ctr, you can import existing images built with docker build or other OCI-compatible software: $ docker build -t my-app. However, containerd itself is often used to build images by higher-level tools.Ĭheck out my investigation post on what actually happens when you build an image to learn more about image building internals. Surprisingly, containerd doesn't provide out-of-the-box image building support. To list local images, one can use: $ ctr images ls $ ctr images pull quay.io/quay/redis:latest $ ctr images pull docker.io/kennethreitz/httpbin:latest When pulling images, the fully-qualified reference seems to be required, so you cannot omit the registry or the tag part: $ ctr images pull docker.io/library/nginx:1.21 However, since it's the closest thing to the actual containerd API, it can serve as a great exploration means - by examining the available commands, you can get a rough idea of what containerd can and cannot do.Ĭtr is also well-suitable for learning the capabilities of low-level container runtimes since ctr + containerd is much closer to actual containers than docker + dockerd. Apparently, its primary audience is containerd developers testing the daemon. The ctr interface is incompatible with Docker CLI and, at first sight, may look not so user-friendly. If you have containerd running on a machine, chances are the ctr binary is also there. Or check it out on GitHub! How to use containerd with ctrĬtr is a command-line client shipped as part of the containerd project. Just install the Robusta Helm chart and start forwarding Prometheus alerts using handy webhooks. Robusta is a runbook automation platform to investigate and remediate problems in your Kubernetes clusters.
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