Lightweight Kubernetes
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160 lines
3.6 KiB

#!/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}hf
;;
*)
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