59ae244442
- Ensure that our documented crictl pod config file contents have
uid and namespace fields for compatibility with crictl 1.24+
This avoids a user potentially hitting the error:
```
getting sandbox status of pod "d3af2db414ce8": metadata.Name,
metadata.Namespace or metadata.Uid is not in metadata
"&PodSandboxMetadata{Name:nydus-sandbox,Uid:,Namespace:default,Attempt:1,}"
getting sandbox status of pod "-A": rpc error: code = NotFound desc = an
error occurred when try to find sandbox: not found
```
Fixes: #8092
Signed-off-by: stevenhorsman <steven@uk.ibm.com>
(cherry picked from commit 8f8c2215)
2.2 KiB
Setup swap device in guest kernel
Introduction
Setup swap device in guest kernel can help to increase memory capacity, handle some memory issues and increase file access speed sometimes. Kata Containers can insert a raw file to the guest as the swap device.
Requisites
The swap config of the containers should be set by annotations. So extra configuration is needed for containerd.
Kata Containers just supports setup swap device in guest kernel with QEMU. Install and setup Kata Containers as shown here.
Enable setup swap device in guest kernel as follows:
$ sudo sed -i -e 's/^#enable_guest_swap.*$/enable_guest_swap = true/g' /etc/kata-containers/configuration.toml
Run a Kata Containers utilizing swap device
Use following command to start a Kata Containers with swappiness 60 and 1GB swap device (swap_in_bytes - memory_limit_in_bytes).
$ pod_yaml=pod.yaml
$ container_yaml=container.yaml
$ image="quay.io/prometheus/busybox:latest"
$ cat << EOF > "${pod_yaml}"
metadata:
name: busybox-sandbox1
uid: $(uuidgen)
namespace: default
EOF
$ cat << EOF > "${container_yaml}"
metadata:
name: busybox-test-swap
annotations:
io.katacontainers.container.resource.swappiness: "60"
io.katacontainers.container.resource.swap_in_bytes: "2147483648"
linux:
resources:
memory_limit_in_bytes: 1073741824
image:
image: "$image"
command:
- top
EOF
$ sudo crictl pull $image
$ podid=$(sudo crictl runp --runtime kata $pod_yaml)
$ cid=$(sudo crictl create $podid $container_yaml $pod_yaml)
$ sudo crictl start $cid
Kata Containers setups swap device for this container only when io.katacontainers.container.resource.swappiness is set.
The following table shows the swap size how to decide if io.katacontainers.container.resource.swappiness is set.
io.katacontainers.container.resource.swap_in_bytes |
memory_limit_in_bytes |
swap size |
|---|---|---|
| set | set | io.katacontainers.container.resource.swap_in_bytes - memory_limit_in_bytes |
| not set | set | memory_limit_in_bytes |
| not set | not set | io.katacontainers.config.hypervisor.default_memory |
| set | not set | cgroup doesn't support this usage |