54 lines
3 KiB
Markdown
54 lines
3 KiB
Markdown
# cri-o Usage Transfer
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This document outlines useful information for ops and dev transfer as it relates to infrastructure that utilizes cri-o.
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## Operational Transfer
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## Abstract
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The `crio` daemon is intended to provide the [CRI](https://github.com/kubernetes/community/blob/master/contributors/devel/container-runtime-interface.md) socket needed for Kubernetes to use for automating deployment, scaling, and management of containerized applications (See the document for [configuring kubernetes to use cri-o](./kubernetes.md) for more information on that).
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Therefore the `crioctl` command line is a client that interfaces to the same grpc socket as the kubernetes daemon would, for talking to the `crio` daemon.
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In many ways `crioctl` is only as feature rich as the Kubernetes CRI requires.
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There are additional tools e.g. `kpod` and [`buildah`](https://github.com/projectatomic/buildah) that provide a feature rich set of commands for all operational needs in a Kubernetes environment.
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## System Tools
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Many traditional tools will still be useful, such as `pstree`, `nsenter` and `lsns`.
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As well as some systemd helpers like `systemd-cgls` and `systemd-cgtop` are still just as applicable.
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## Equivalents
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For many troubleshooting and information collection steps, there may be an existing pattern.
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Following provides equivalent with cri-o tools for gathering information or jumping into containers, for operational use.
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| Existing Step | CRI-O (and friends) |
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| :---: | :---: |
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| `docker exec` | [`crioctl ctr exec`](./docs/crio.8.md) |
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| `docker info` | [`kpod info`](./docs/kpod-info.1.md) |
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| `docker inspect` | [`kpod inspect`](./docs/kpod-inspect.1.md) |
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| `docker logs` | `journalctl ...` |
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| `docker ps` | [`crioctl ctr list`](./docs/crio.8.md) or [`runc list`](https://github.com/opencontainers/runc/blob/master/man/runc-list.8.md) |
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| `docker stats` | `crioctl ctr status`|
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If you were already using steps like `kubectl exec` (or `oc exec` on OpenShift), they will continue to function the same way.
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## Development Transfer
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There are other equivalents for these tools
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| Existing Step | CRI-O (and friends) |
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| :---: | :---: |
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| `docker build` | [`buildah bud`](https://github.com/projectatomic/buildah/blob/master/docs/buildah-bud.md) |
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| `docker cp` | [`kpod mount`](./docs/kpod-cp.1.md) |
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| `docker diff` | [`kpod diff`](./docs/kpod-diff.1.md) |
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| `docker export` | [`kpod export`](./docs/kpod-export.1.md) |
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| `docker history`| [`kpod history`](./docs/kpod-history.1.md)|
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| `docker images` | [`kpod images`](./docs/kpod-images.1.md) |
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| `docker load` | [`kpod load`](./docs/kpod-load.1.md) |
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| `docker pull` | [`kpod pull`](./docs/kpod-pull.1.md) |
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| `docker push` | [`kpod push`](./docs/kpod-push.1.md) |
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| `docker rmi` | [`kpod rmi`](./docs/kpod-rmi.1.md) |
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| `docker save` | [`kpod save`](./docs/kpod-save.1.md) |
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| `docker tag` | [`kpod tag`](./docs/kpod-tag.1.md) |
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| `docker version`| [`kpod version`](./docs/kpod-version.1.md)|
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