Vincent Batts
5c78a457f6
Facilitating the "how do i do X?" knowledge transfer process. Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
49 lines
2.6 KiB
Markdown
49 lines
2.6 KiB
Markdown
# 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 info` | [`kpod info`](./docs/kpod-info.2.md) |
|
|
| `docker inspect` | [`kpod inspect`]() (TBD) |
|
|
| `docker stats` | [`crioctl ctr status`]() (TBD) |
|
|
| `docker exec` | [`crioctl ctr exec`](./docs/crio.8.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 logs` | [`kpod ...`]() (TBD) or `journalctl ...` |
|
|
|
|
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 images` | [`kpod images`](./docs/kpod-images.1.md) |
|
|
| `docker rmi` | [`kpod rmi`](./docs/kpod-rmi.1.md) |
|
|
| `docker tag` | [`kpod tag`](./docs/kpod-tag.1.md) |
|
|
| `docker pull` | [`kpod pull`](./docs/kpod-pull.1.md) |
|
|
| `docker load` | [`kpod load`](TBD) |
|
|
| `docker save` | [`kpod save`](TBD) |
|
|
| `docker build` | [`buildah bud`](https://github.com/projectatomic/buildah/blob/master/docs/buildah-bud.md) |
|
|
| `docker push` | [`buildah push`](https://github.com/projectatomic/buildah/blob/master/docs/buildah-push.md) |
|