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diff --git a/transfer.md b/transfer.md new file mode 100644 index 000000000..e077c9b76 --- /dev/null +++ b/transfer.md @@ -0,0 +1,68 @@ +# CRI-O Usage Transfer + +This document outlines useful information for ops and dev transfer as it relates to infrastructure that utilizes CRI-O. + +## Operational Transfer + +## Abstract + +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). +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. +In many ways `crioctl` is only as feature rich as the Kubernetes CRI requires. +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. + + +## System Tools + +Many traditional tools will still be useful, such as `pstree`, `nsenter` and `lsns`. +As well as some systemd helpers like `systemd-cgls` and `systemd-cgtop` are still just as applicable. + +## Equivalents + +For many troubleshooting and information collection steps, there may be an existing pattern. +Following provides equivalent with CRI-O tools for gathering information or jumping into containers, for operational use. + +| Existing Step | CRI-O (and friends) | +| :---: | :---: | +| `docker exec` | [`crioctl ctr exec`](./docs/crio.8.md) | +| `docker info` | [`kpod info`](./docs/kpod-info.1.md) | +| `docker inspect` | [`kpod inspect`](./docs/kpod-inspect.1.md) | +| `docker logs` | [`kpod logs`](./docs/kpod-logs.1.md) | +| `docker ps` | [`crioctl ctr list`](./docs/crio.8.md) or [`runc list`](https://github.com/opencontainers/runc/blob/master/man/runc-list.8.md) | +| `docker stats` | [`kpod stats`](./docs/kpod-stats.1.md) or `crioctl ctr status`| + +If you were already using steps like `kubectl exec` (or `oc exec` on OpenShift), they will continue to function the same way. + +## Development Transfer + +There are other equivalents for these tools + +| Existing Step | CRI-O (and friends) | +| :---: | :---: | +| `docker attach` | [`kpod exec`](./docs/kpod-attach.1.md) ***| +| `docker build` | [`buildah bud`](https://github.com/projectatomic/buildah/blob/master/docs/buildah-bud.md) | +| `docker cp` | [`kpod mount`](./docs/kpod-cp.1.md) **** | +| `docker diff` | [`kpod diff`](./docs/kpod-diff.1.md) | +| `docker export` | [`kpod export`](./docs/kpod-export.1.md) | +| `docker history`| [`kpod history`](./docs/kpod-history.1.md)| +| `docker images` | [`kpod images`](./docs/kpod-images.1.md) | +| `docker kill` | [`kpod kill`](./docs/kpod-kill.1.md) | +| `docker load` | [`kpod load`](./docs/kpod-load.1.md) | +| `docker login` | [`kpod login`](./docs/kpod-login.1.md) | +| `docker logout` | [`kpod logout`](./docs/kpod-logout.1.md) | +| `docker pause` | [`kpod pause`](./docs/kpod-pause.1.md) | +| `docker ps` | [`kpod ps`](./docs/kpod-ps.1.md) | +| `docker pull` | [`kpod pull`](./docs/kpod-pull.1.md) | +| `docker push` | [`kpod push`](./docs/kpod-push.1.md) | +| `docker rename` | [`kpod rename`](./docs/kpod-rename.1.md) | +| `docker rm` | [`kpod rm`](./docs/kpod-rm.1.md) | +| `docker rmi` | [`kpod rmi`](./docs/kpod-rmi.1.md) | +| `docker save` | [`kpod save`](./docs/kpod-save.1.md) | +| `docker stop` | [`kpod stop`](./docs/kpod-stop.1.md) | +| `docker tag` | [`kpod tag`](./docs/kpod-tag.1.md) | +| `docker unpause`| [`kpod unpause`](./docs/kpod-unpause.1.md)| +| `docker version`| [`kpod version`](./docs/kpod-version.1.md)| +| `docker wait` | [`kpod wait`](./docs/kpod-wait.1.md)| + +*** Use `kpod exec` to enter a container and `kpod logs` to view the output of pid 1 of a container. +**** Use mount to take advantage of the entire linux tool chain rather then just cp. Read [`here`](./docs/kpod-cp.1.md) for more information. |