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Variables

var K3sKillallScript = template.Must(template.New("k3s-killall.sh").Parse(
	dedent.Dedent(`#!/bin/sh
[ $(id -u) -eq 0 ] || exec sudo $0 $@

for bin in /var/lib/rancher/k3s/data/**/bin/; do
    [ -d $bin ] && export PATH=$PATH:$bin:$bin/aux
done

set -x

for service in /etc/systemd/system/k3s*.service; do
    [ -s $service ] && systemctl stop $(basename $service)
done

for service in /etc/init.d/k3s*; do
    [ -x $service ] && $service stop
done

pschildren() {
    ps -e -o ppid= -o pid= | \
    sed -e 's/^\s*//g; s/\s\s*/\t/g;' | \
    grep -w "^$1" | \
    cut -f2
}

pstree() {
    for pid in $@; do
        echo $pid
        for child in $(pschildren $pid); do
            pstree $child
        done
    done
}

killtree() {
    kill -9 $(
        { set +x; } 2>/dev/null;
        pstree $@;
        set -x;
    ) 2>/dev/null
}

getshims() {
    ps -e -o pid= -o args= | sed -e 's/^ *//; s/\s\s*/\t/;' | grep -w 'k3s/data/[^/]*/bin/containerd-shim' | cut -f1
}

killtree $({ set +x; } 2>/dev/null; getshims; set -x)

do_unmount_and_remove() {
    set +x
    while read -r _ path _; do
        case "$path" in $1*) echo "$path" ;; esac
    done < /proc/self/mounts | sort -r | xargs -r -t -n 1 sh -c 'umount "$0" && rm -rf "$0"'
    set -x
}

do_unmount_and_remove '/run/k3s'
do_unmount_and_remove '/var/lib/rancher/k3s'
do_unmount_and_remove '/var/lib/kubelet/pods'
do_unmount_and_remove '/var/lib/kubelet/plugins'
do_unmount_and_remove '/run/netns/cni-'

# Remove CNI namespaces
ip netns show 2>/dev/null | grep cni- | xargs -r -t -n 1 ip netns delete

# Delete network interface(s) that match 'master cni0'
ip link show 2>/dev/null | grep 'master cni0' | while read ignore iface ignore; do
    iface=${iface%%@*}
    [ -z "$iface" ] || ip link delete $iface
done
ip link delete cni0
ip link delete flannel.1
ip link delete flannel-v6.1
ip link delete kube-ipvs0
ip link delete flannel-wg
ip link delete flannel-wg-v6
ip link delete nodelocaldns
ip link delete cilium_host
ip link delete cilium_vxlan
ip -br link show | grep 'cali[a-f0-9]*' | awk -F '@' '{print $1}' | xargs -r -t -n 1 ip link delete
rm -rf /var/lib/cni/
iptables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | iptables-restore
ip6tables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | ip6tables-restore
    `)))

K3sKillallScript defines the template of k3s-killall script.

var (

	// k3sRegistryConfigTempl defines the template of k3s' registry.
	K3sRegistryConfigTempl = template.Must(template.New("registries.yaml").Funcs(funcMap).Parse(
		dedent.Dedent(`{{ toYaml .Registries }}`)))
)

var (
	// K3sService defines the template of kubelet service for systemd.
	K3sService = template.Must(template.New("k3s.service").Parse(
		dedent.Dedent(`[Unit]
Description=Lightweight Kubernetes
Documentation=https://k3s.io
Wants=network-online.target
After=network-online.target

[Install]
WantedBy=multi-user.target

[Service]
Type=notify
EnvironmentFile=/etc/systemd/system/k3s.service.env
{{ if .IsMaster }}
Environment="K3S_ARGS={{ range .CertSANs }} --tls-san={{ . }}{{- end }} {{ range .ApiserverArgs }} --kube-apiserver-arg={{ . }}{{- end }} {{ range .ControllerManager }} --kube-controller-manager-arg={{ . }}{{- end }} {{ range .SchedulerArgs }} --kube-scheduler-arg={{ . }}{{- end }} --cluster-cidr={{ .PodSubnet }} --service-cidr={{ .ServiceSubnet }} --cluster-dns={{ .ClusterDns }} --flannel-backend=none --disable-network-policy --disable-cloud-controller --disable=servicelb,traefik,metrics-server,local-storage"
{{ end }}
Environment="K3S_EXTRA_ARGS={{ if .IsDockerRuntime }}--docker{{ end }} {{ if .ContainerRuntimeEndpoint }}--container-runtime-endpoint={{ .ContainerRuntimeEndpoint }}{{ end }} --node-name={{ .HostName }}  --node-ip={{ .NodeIP }}  --pause-image={{ .PauseImage }} {{ range .KubeletArgs }} --kubelet-arg={{ . }}{{- end }} {{ range .KubeProxyArgs }} --kube-proxy-arg={{ . }}{{- end }}"
Environment="K3S_ROLE={{ if .IsMaster }}server{{ else }}agent{{ end }}"
Environment="K3S_SERVER_ARGS={{ if .Server }}--server={{ .Server }}{{ end }}"
KillMode=process
Delegate=yes
LimitNOFILE=1048576
LimitNPROC=infinity
LimitCORE=infinity
TasksMax=infinity
TimeoutStartSec=0
Restart=always
RestartSec=5s
ExecStartPre=-/sbin/modprobe br_netfilter
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/local/bin/k3s $K3S_ROLE $K3S_ARGS $K3S_EXTRA_ARGS $K3S_SERVER_ARGS
    `)))
)

var K3sServiceEnv = template.Must(template.New("k3s.service.env").Parse(
	dedent.Dedent(`# Note: This dropin only works with k3s
{{ if .IsMaster }}
K3S_DATASTORE_ENDPOINT={{ .DataStoreEndPoint }}
{{- if .DataStoreCaFile }}
K3S_DATASTORE_CAFILE={{ .DataStoreCaFile }}
{{- end }}
{{- if .DataStoreCertFile }}
K3S_DATASTORE_CERTFILE={{ .DataStoreCertFile }}
{{- end }}
{{- if .DataStoreKeyFile }}
K3S_DATASTORE_KEYFILE={{ .DataStoreKeyFile }}
{{- end }}
K3S_KUBECONFIG_MODE=644
{{ end }}
{{ if .Token }}
K3S_TOKEN={{ .Token }}
{{ end }}

    `)))

K3sServiceEnv defines the template of kubelet's Env for the kubelet's systemd service.

var K3sUninstallScript = template.Must(template.New("k3s-uninstall.sh").Parse(
	dedent.Dedent(`#!/bin/sh
set -x
[ $(id -u) -eq 0 ] || exec sudo $0 $@

/usr/local/bin/k3s-killall.sh

if which systemctl; then
    systemctl disable k3s
    systemctl reset-failed k3s
    systemctl daemon-reload
fi
if which rc-update; then
    rc-update delete k3s default
fi

rm -f /etc/systemd/system/k3s.service
rm -rf /etc/systemd/system/k3s.service.d
rm -f /etc/systemd/system/k3s.service.env

remove_uninstall() {
    rm -f /usr/local/bin/k3s-uninstall.sh
}
trap remove_uninstall EXIT

if (ls /etc/systemd/system/k3s*.service || ls /etc/init.d/k3s*) >/dev/null 2>&1; then
    set +x; echo 'Additional k3s services installed, skipping uninstall of k3s'; set -x
    exit
fi

for cmd in kubectl crictl ctr; do
    if [ -L /usr/local/bin/$cmd ]; then
        rm -f /usr/local/bin/$cmd
    fi
done

rm -rf /etc/rancher/k3s
rm -rf /run/k3s
rm -rf /run/flannel
rm -rf /var/lib/rancher/k3s
rm -rf /var/lib/kubelet
rm -f /usr/local/bin/k3s
rm -f /usr/local/bin/k3s-killall.sh

if type yum >/dev/null 2>&1; then
    yum remove -y k3s-selinux
    rm -f /etc/yum.repos.d/rancher-k3s-common*.repo
fi
    `)))

K3sUninstallScript defines the template of k3s-killall script.