k3s 部署简化版 Kubernetes

版本

基于v1.23.2+k3s1

中文文档

http://docs.rancher.cn/docs/k3s/_index

在线安装方式

curl -sfL https://get.k3s.io | sh -

安装最新版本

curl -sfL https://get.k3s.io | INSTALL_K3S_CHANNEL=latest sh -

国内镜像

curl -sfL http://rancher-mirror.cnrancher.com/k3s/k3s-install.sh | INSTALL_K3S_MIRROR=cn INSTALL_K3S_CHANNEL=latest sh -

二进制文件方式

wget https://github.com/k3s-io/k3s/releases/download/v1.23.2%2Bk3s1/k3s

添加可执行权限

chmod +x k3s

添加软链接

sudo ln -s /root/k3s/k3s /usr/local/bin/k3s

启动k3s

nohup k3s server > k3s.out 2>&1 &

获取运行节点

k3s kubectl get nodes

配置文件位置

/etc/rancher/k3s/k3s.yaml

node token位置

cat /var/lib/rancher/k3s/server/node-token

重启服务

脚本安装的方式可以使用systemctl重启k3s。

systemctl restart k3s

停止服务

备注：只适用于在线安装方式

k3s-killall.sh

完整路径

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

脚本完整内容

#!/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() {
    awk -v path="$1" '$2 ~ ("^" path) { print $2 }' /proc/self/mounts | sort -r | xargs -r -t -n 1 sh -c 'umount "$0" && rm -rf "$0"'
}

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 '/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
rm -rf /var/lib/cni/
iptables-save | grep -v KUBE- | grep -v CNI- | iptables-restore

卸载 k3s

备注：只适用于在线安装方式

k3s-uninstall.sh

完整路径

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

脚本完整内容

#!/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 -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

开源地址

https://github.com/k3s-io/k3s