Add install script for get.k3s.io

install.sh

+#!/bin/sh
+set -e
+
+VERSION=v0.1.0-rc3
+
+info()
+{
+    echo "[INFO] " "$@"
+}
+
+fatal()
+{
+    echo "[ERROR] " "$@"
+    exit 1
+}
+
+ARCH=`uname -m`
+
+case $ARCH in
+    amd64)
+        ARCH=amd64
+        SUFFIX=
+        ;;
+    x86_64)
+        ARCH=amd64
+        SUFFIX=
+        ;;
+    arm64)
+        ARCH=arm64
+        SUFFIX=-${ARCH}
+        ;;
+    aarch64)
+        ARCH=arm64
+        SUFFIX=-${ARCH}
+        ;;
+    arm*)
+        ARCH=arm
+        SUFFIX=-${ARCH}
+        ;;
+    *)
+        fatal Unknown architecture $ARCH
+esac
+
+BINURL=https://github.com/ibuildthecloud/k3s/releases/download/${VERSION}/k3s${SUFFIX}
+HASHURL=https://github.com/ibuildthecloud/k3s/releases/download/${VERSION}/sha256sum-${ARCH}.txt
+
+if [ -d /run/systemd ]; then
+    SYSTEMD=true
+else
+    fatal "Can not find systemd or Docker to use as a process supervisor for k3s"
+fi
+
+SUDO=sudo
+if [ `id -u` = 0 ]; then
+    SUDO=
+fi
+
+if [ "$SYSTEMD" = "true" ]; then
+    info Creating uninstall script /usr/local/bin/k3s-uninstall.sh
+    TMPUNINSTALL=`mktemp -t k3s-install.XXXXXXXXXX`
+    cat > $TMPUNINSTALL << "EOF"
+#!/bin/sh
+set -x
+systemctl stop k3s
+systemctl disable k3s
+systemctl daemon-reload
+rm -f /etc/systemd/system/k3s.service
+rm -f /usr/local/bin/k3s
+if [ -L /usr/local/bin/kubectl ]; then
+    rm -f /usr/local/bin/kubectl
+fi
+if [ -L /usr/local/bin/crictl ]; then
+    rm -f /usr/local/bin/crictl
+fi
+if [ -e /sys/fs/cgroup/systemd/system.slice/k3s.service/cgroup.procs ]; then
+    kill -9 `cat /sys/fs/cgroup/systemd/system.slice/k3s.service/cgroup.procs`
+fi
+umount `cat /proc/self/mounts | awk '{print $2}' | grep '^/run/k3s'`
+umount `cat /proc/self/mounts | awk '{print $2}' | grep '^/var/lib/rancher/k3s'`
+
+rm -rf /var/lib/rancher/k3s
+
+rm -f /usr/local/bin/k3s-uninstall.sh
+EOF
+    chmod 755 $TMPUNINSTALL
+    $SUDO chown root:root $TMPUNINSTALL
+    $SUDO mv -f $TMPUNINSTALL /usr/local/bin/k3s-uninstall.sh
+
+    CURL=`which curl`
+    WGET=`which wget`
+
+    if [ -n "$CURL" ]; then
+        TMPHASH=`mktemp -t k3s-install.XXXXXXXXXX`
+        TMPBIN=`mktemp -t k3s-install.XXXXXXXXXX`
+
+        info Downloading $HASHURL
+        $CURL -o $TMPHASH -sfL $HASHURL
+
+        info Downloading $BINURL
+        $CURL -o $TMPBIN -sfL $BINURL
+    fi
+
+
+    info Verifying download
+    EXPECTED=`grep k3s $TMPHASH | awk '{print $1}'`
+    ACTUAL=`sha256sum $TMPBIN | awk '{print $1}'` 
+    rm -f $TMPHASH
+    if [ "$EXPECTED" != "$ACTUAL" ]; then
+        rm -f $TMPBIN
+        fatal "Download sha256 does not match ${EXPECTED} got ${ACTUAL}"
+    fi
+
+    chmod 755 $TMPBIN
+    info Installing k3s to /usr/local/bin/k3s
+
+    $SUDO chown root:root $TMPBIN
+    $SUDO mv -f $TMPBIN /usr/local/bin/k3s
+
+    if [ ! -e /usr/local/bin/kubectl ]; then
+        info Creating /usr/local/bin/kubectl symlink to k3s
+        $SUDO ln -s k3s /usr/local/bin/kubectl
+    fi
+
+    if [ ! -e /usr/local/bin/crictl ]; then
+        info Creating /usr/local/bin/crictl symlink to k3s
+        $SUDO ln -s k3s /usr/local/bin/crictl
+    fi
+
+    info systemd: Creating /etc/systemd/system/k3s.service
+    $SUDO tee /etc/systemd/system/k3s.service >/dev/null << "EOF"
+[Unit]
+Description=Lightweight Kubernetes
+Documentation=https://k3s.io
+After=network.target
+
+[Service]
+ExecStartPre=-/sbin/modprobe br_netfilter
+ExecStartPre=-/sbin/modprobe overlay
+ExecStart=/usr/local/bin/k3s server
+KillMode=process
+Delegate=yes
+LimitNOFILE=infinity
+LimitNPROC=infinity
+LimitCORE=infinity
+TasksMax=infinity
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+    info systemd: Enabling k3s unit
+    $SUDO systemctl enable k3s.service >/dev/null
+    $SUDO systemctl daemon-reload >/dev/null
+
+    info systemd: Starting k3s
+    $SUDO systemctl start k3s.service
+else
+    fatal "Can not find systemd"
+fi