Containerd
Customize Containerd Settings
The base containerd configuration expects to merge in any additional configs present in /etc/cri/conf.d/20-customization.part.
Examples
Exposing Metrics
Patch the machine config by adding the following:
machine:
files:
- content: |
[metrics]
address = "0.0.0.0:11234"
path: /etc/cri/conf.d/20-customization.part
op: create
Once the server reboots, metrics are now available:
$ curl ${IP}:11234/v1/metrics
# HELP container_blkio_io_service_bytes_recursive_bytes The blkio io service bytes recursive
# TYPE container_blkio_io_service_bytes_recursive_bytes gauge
container_blkio_io_service_bytes_recursive_bytes{container_id="0677d73196f5f4be1d408aab1c4125cf9e6c458a4bea39e590ac779709ffbe14",device="/dev/dm-0",major="253",minor="0",namespace="k8s.io",op="Async"} 0
container_blkio_io_service_bytes_recursive_bytes{container_id="0677d73196f5f4be1d408aab1c4125cf9e6c458a4bea39e590ac779709ffbe14",device="/dev/dm-0",major="253",minor="0",namespace="k8s.io",op="Discard"} 0
...
...
Pause Image
This change is often required for air-gapped environments, as containerd CRI plugin has a reference to the pause image which is used
to create pods, and it can’t be controlled with Kubernetes pod definitions.
machine:
files:
- content: |
[plugins]
[plugins."io.containerd.grpc.v1.cri"]
sandbox_image = "registry.k8s.io/pause:3.8"
path: /etc/cri/conf.d/20-customization.part
op: create
Now the pause image is set to registry.k8s.io/pause:3.8:
$ talosctl containers --kubernetes
NODE NAMESPACE ID IMAGE PID STATUS
172.20.0.5 k8s.io kube-system/kube-flannel-6hfck registry.k8s.io/pause:3.8 1773 SANDBOX_READY
172.20.0.5 k8s.io └─ kube-system/kube-flannel-6hfck:install-cni:bc39fec3cbac ghcr.io/siderolabs/install-cni:v1.3.0-alpha.0-2-gb155fa0 0 CONTAINER_EXITED
172.20.0.5 k8s.io └─ kube-system/kube-flannel-6hfck:install-config:5c3989353b98 ghcr.io/siderolabs/flannel:v0.20.1 0 CONTAINER_EXITED
172.20.0.5 k8s.io └─ kube-system/kube-flannel-6hfck:kube-flannel:116c67b50da8 ghcr.io/siderolabs/flannel:v0.20.1 2092 CONTAINER_RUNNING
172.20.0.5 k8s.io kube-system/kube-proxy-xp7jq registry.k8s.io/pause:3.8 1780 SANDBOX_READY
172.20.0.5 k8s.io └─ kube-system/kube-proxy-xp7jq:kube-proxy:84fc77c59e17 registry.k8s.io/kube-proxy:v1.26.0-alpha.3 1843 CONTAINER_RUNNING