mirror of
https://github.com/puppetmaster/typhoon.git
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937acc4b5a
* Kubelet GracefulNodeShutdown works, but only partially handles
gracefully stopping the Kubelet. The most noticeable drawback
is that Completed Pods are left around
* Use a project like poseidon/scuttle or a similar systemd unit
as a snippet to add drain and/or delete behaviors if desired
* This reverts commit 1786e34f33.
Rel:
* https://www.psdn.io/posts/kubelet-graceful-shutdown/
* https://github.com/poseidon/scuttle
125 lines
4.3 KiB
YAML
125 lines
4.3 KiB
YAML
variant: flatcar
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version: 1.0.0
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systemd:
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units:
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- name: docker.service
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enabled: true
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- name: locksmithd.service
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mask: true
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- name: kubelet.path
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enabled: true
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contents: |
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[Unit]
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Description=Watch for kubeconfig
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[Path]
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PathExists=/etc/kubernetes/kubeconfig
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[Install]
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WantedBy=multi-user.target
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- name: wait-for-dns.service
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enabled: true
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contents: |
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[Unit]
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Description=Wait for DNS entries
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Wants=systemd-resolved.service
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Before=kubelet.service
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[Service]
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Type=oneshot
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RemainAfterExit=true
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ExecStart=/bin/sh -c 'while ! /usr/bin/grep '^[^#[:space:]]' /etc/resolv.conf > /dev/null; do sleep 1; done'
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[Install]
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RequiredBy=kubelet.service
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- name: kubelet.service
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contents: |
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[Unit]
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Description=Kubelet
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Requires=docker.service
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After=docker.service
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Requires=coreos-metadata.service
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After=coreos-metadata.service
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Wants=rpc-statd.service
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[Service]
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Environment=KUBELET_IMAGE=quay.io/poseidon/kubelet:v1.25.3
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EnvironmentFile=/run/metadata/coreos
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ExecStartPre=/bin/mkdir -p /etc/cni/net.d
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ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
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ExecStartPre=/bin/mkdir -p /opt/cni/bin
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ExecStartPre=/bin/mkdir -p /var/lib/calico
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ExecStartPre=/bin/mkdir -p /var/lib/kubelet/volumeplugins
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ExecStartPre=/usr/bin/bash -c "grep 'certificate-authority-data' /etc/kubernetes/kubeconfig | awk '{print $2}' | base64 -d > /etc/kubernetes/ca.crt"
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# Podman, rkt, or runc run container processes, whereas docker run
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# is a client to a daemon and requires workarounds to use within a
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# systemd unit. https://github.com/moby/moby/issues/6791
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ExecStartPre=/usr/bin/docker run -d \
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--name kubelet \
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--privileged \
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--pid host \
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--network host \
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-v /etc/cni/net.d:/etc/cni/net.d:ro \
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-v /etc/kubernetes:/etc/kubernetes:ro \
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-v /etc/machine-id:/etc/machine-id:ro \
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-v /usr/lib/os-release:/etc/os-release:ro \
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-v /lib/modules:/lib/modules:ro \
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-v /run:/run \
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-v /sys/fs/cgroup:/sys/fs/cgroup \
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-v /var/lib/calico:/var/lib/calico:ro \
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-v /var/lib/containerd:/var/lib/containerd \
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-v /var/lib/kubelet:/var/lib/kubelet:rshared \
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-v /var/log:/var/log \
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-v /opt/cni/bin:/opt/cni/bin \
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$${KUBELET_IMAGE} \
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--bootstrap-kubeconfig=/etc/kubernetes/kubeconfig \
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--config=/etc/kubernetes/kubelet.yaml \
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--container-runtime-endpoint=unix:///run/containerd/containerd.sock \
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--hostname-override=$${COREOS_DIGITALOCEAN_IPV4_PRIVATE_0} \
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--kubeconfig=/var/lib/kubelet/kubeconfig \
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--node-labels=node.kubernetes.io/node
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ExecStart=docker logs -f kubelet
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ExecStop=docker stop kubelet
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ExecStopPost=docker rm kubelet
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Restart=always
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RestartSec=5
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[Install]
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WantedBy=multi-user.target
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storage:
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directories:
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- path: /etc/kubernetes
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mode: 0755
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files:
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- path: /etc/kubernetes/kubelet.yaml
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mode: 0644
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contents:
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inline: |
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apiVersion: kubelet.config.k8s.io/v1beta1
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kind: KubeletConfiguration
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authentication:
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anonymous:
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enabled: false
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webhook:
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enabled: true
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x509:
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clientCAFile: /etc/kubernetes/ca.crt
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authorization:
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mode: Webhook
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cgroupDriver: systemd
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clusterDNS:
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- ${cluster_dns_service_ip}
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clusterDomain: ${cluster_domain_suffix}
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healthzPort: 0
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rotateCertificates: true
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shutdownGracePeriod: 45s
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shutdownGracePeriodCriticalPods: 30s
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staticPodPath: /etc/kubernetes/manifests
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readOnlyPort: 0
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resolvConf: /run/systemd/resolve/resolv.conf
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volumePluginDir: /var/lib/kubelet/volumeplugins
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- path: /etc/systemd/logind.conf.d/inhibitors.conf
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contents:
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inline: |
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[Login]
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InhibitDelayMaxSec=45s
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- path: /etc/sysctl.d/max-user-watches.conf
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mode: 0644
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contents:
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inline: |
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fs.inotify.max_user_watches=16184
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