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docs: Add swap annotations introduction

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Add swap annotations introduction of
`io.katacontainers.config.hypervisor.enable_guest_swap`,
`io.katacontainers.container.resource.swappiness"` and
`io.katacontainers.container.resource.swap_in_bytes"` to
how-to-set-sandbox-config-kata.md.

Fixes: #2326

Signed-off-by: Hui Zhu <teawater@antfin.com>
This commit is contained in:
Hui Zhu 2021-07-14 16:32:22 +08:00 committed by Hui Zhu
parent 9bbaa66f39
commit 2174fee48d
1 changed files with 14 additions and 5 deletions
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19
docs/how-to/how-to-set-sandbox-config-kata.md
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@ -91,6 +91,13 @@ There are several kinds of Kata configurations and they are listed below.
| `io.katacontainers.config.hypervisor.virtio_fs_cache` | string | the cache mode for virtio-fs, valid values are `always`, `auto` and `none` |
| `io.katacontainers.config.hypervisor.virtio_fs_daemon` | string | virtio-fs `vhost-user` daemon path |
| `io.katacontainers.config.hypervisor.virtio_fs_extra_args` | string | extra options passed to `virtiofs` daemon |
| `io.katacontainers.config.hypervisor.enable_guest_swap` | `boolean` | enable swap in the guest |
## Container Options
| Key | Value Type | Comments |
|-------| ----- | ----- |
| `io.katacontainers.container.resource.swappiness"` | `uint64` | specify the `Resources.Memory.Swappiness` |
| `io.katacontainers.container.resource.swap_in_bytes"` | `uint64` | specify the `Resources.Memory.Swap` |
# CRI-O Configuration
@ -100,11 +107,12 @@ In case of CRI-O, all annotations specified in the pod spec are passed down to K
For containerd, annotations specified in the pod spec are passed down to Kata
starting with version `1.3.0` of containerd. Additionally, extra configuration is
needed for containerd, by providing a `pod_annotations` field in the containerd config
file. The `pod_annotations` field is a list of annotations that can be passed down to
Kata as OCI annotations. It supports golang match patterns. Since annotations supported
by Kata follow the pattern `io.katacontainers.*`, the following configuration would work
for passing annotations to Kata from containerd:
needed for containerd, by providing `pod_annotations` field and
`container_annotations` field in the containerd config
file. The `pod_annotations` field and `container_annotations` field are two lists of
annotations that can be passed down to Kata as OCI annotations. They support golang match
patterns. Since annotations supported by Kata follow the pattern `io.katacontainers.*`,
the following configuration would work for passing annotations to Kata from containerd:
```
$ cat /etc/containerd/config
@ -113,6 +121,7 @@ $ cat /etc/containerd/config
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.kata]
runtime_type = "io.containerd.kata.v2"
pod_annotations = ["io.katacontainers.*"]
container_annotations = ["io.katacontainers.*"]
....
```