09_worker.sh

#!/usr/bin/env bash

wget --timestamping \
  https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.17.0/crictl-v1.17.0-linux-amd64.tar.gz \
  https://storage.googleapis.com/gvisor/releases/nightly/latest/runsc \
  https://github.com/opencontainers/runc/releases/download/v1.0.0-rc10/runc.amd64\
  https://github.com/containernetworking/plugins/releases/download/v0.8.5/cni-plugins-linux-amd64-v0.8.5.tgz \
  https://github.com/containerd/containerd/releases/download/v1.3.2/containerd-1.3.2.linux-amd64.tar.gz \
  https://storage.googleapis.com/kubernetes-release/release/v1.17.3/bin/linux/amd64/kubectl \
  https://storage.googleapis.com/kubernetes-release/release/v1.17.3/bin/linux/amd64/kube-proxy \
  https://storage.googleapis.com/kubernetes-release/release/v1.17.3/bin/linux/amd64/kubelet


sudo mkdir -p \
  /etc/cni/net.d \
  /opt/cni/bin \
  /var/lib/kubelet \
  /var/lib/kube-proxy \
  /var/lib/kubernetes \
  /var/run/kubernetes

mkdir -p containerd
tar -xvf crictl-v1.17.0-linux-amd64.tar.gz
tar -xvf containerd-1.3.2.linux-amd64.tar.gz -C containerd
sudo tar -xvf cni-plugins-linux-amd64-v0.8.5.tgz -C /opt/cni/bin/
sudo mv runc.amd64 runc
chmod +x crictl kubectl kube-proxy kubelet runc runsc
sudo mv crictl kubectl kube-proxy kubelet runc runsc /usr/local/bin
sudo mv containerd/bin/* /bin/

######################################################################################

CONFIG_FILE_DIRECTORY=../kubernetes_setup_files 
CWD=$(pwd)
cd ${CONFIG_FILE_DIRECTORY}

HOSTNAME=$(hostname -s)
POD_CIDR_INSTANCE_RANGE=$(hostname -s | tr "-" " " | awk '{print $2}')
POD_CIDR=192.168.${POD_CIDR_INSTANCE_RANGE}.0/24


########################## CNI CONFIG ##############################################


cat <<EOF | sudo tee /etc/cni/net.d/10-bridge.conf
{
    "cniVersion": "0.3.0",
    "name": "bridge",
    "type": "bridge",
    "bridge": "cnio0",
    "isGateway": true,
    "ipMasq": true,
    "ipam": {
        "type": "host-local",
        "ranges": [
          [{"subnet": "${POD_CIDR}"}]
        ],
        "routes": [{"dst": "0.0.0.0/0"}]
    }
}
EOF

cat <<EOF | sudo tee /etc/cni/net.d/99-loopback.conf
{
    "cniVersion": "0.3.0",
    "name": "lo",
    "type": "loopback"
}
EOF
#################################################################################



########################### CONTAINERED CONFIG ###########################################

sudo mkdir -p /etc/containerd/


cat << EOF | sudo tee /etc/containerd/config.toml
[plugins]
  [plugins.cri.containerd]
    snapshotter = "overlayfs"
    [plugins.cri.containerd.default_runtime]
      runtime_type = "io.containerd.runtime.v1.linux"
      runtime_engine = "/usr/local/bin/runc"
      runtime_root = ""
    [plugins.cri.containerd.untrusted_workload_runtime]
      runtime_type = "io.containerd.runtime.v1.linux"
      runtime_engine = "/usr/local/bin/runsc"
      runtime_root = "/run/containerd/runsc"
    [plugins.cri.containerd.gvisor]
      runtime_type = "io.containerd.runtime.v1.linux"
      runtime_engine = "/usr/local/bin/runsc"
      runtime_root = "/run/containerd/runsc"
EOF

cat <<EOF | sudo tee /etc/systemd/system/containerd.service
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target

[Service]
ExecStartPre=/sbin/modprobe overlay
ExecStart=/bin/containerd

Delegate=yes
KillMode=process
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=infinity
# Comment TasksMax if your systemd version does not supports it.
# Only systemd 226 and above support this version.
TasksMax=infinity

[Install]
WantedBy=multi-user.target
EOF

######################################################################################


##############################  KUBELET CONFIGURATION ####################################

sudo cp ${HOSTNAME}-key.pem ${HOSTNAME}.pem /var/lib/kubelet/
sudo cp ${HOSTNAME}.kubeconfig /var/lib/kubelet/kubeconfig
sudo cp ca.pem /var/lib/kubernetes/

cat <<EOF | sudo tee /var/lib/kubelet/kubelet-config.yaml
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
  anonymous:
    enabled: false
  webhook:
    enabled: true
  x509:
    clientCAFile: "/var/lib/kubernetes/ca.pem"
authorization:
  mode: Webhook
clusterDomain: "cluster.local"
clusterDNS:
  - "10.32.0.10"
podCIDR: "${POD_CIDR}"
resolvConf: "/run/systemd/resolve/resolv.conf"
runtimeRequestTimeout: "15m"
tlsCertFile: "/var/lib/kubelet/${HOSTNAME}.pem"
tlsPrivateKeyFile: "/var/lib/kubelet/${HOSTNAME}-key.pem"
EOF


cat <<EOF | sudo tee /etc/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=containerd.service
Requires=containerd.service

[Service]
ExecStart=/usr/local/bin/kubelet \\
  --config=/var/lib/kubelet/kubelet-config.yaml \\
  --container-runtime=remote \\
  --container-runtime-endpoint=unix:///var/run/containerd/containerd.sock \\
  --image-pull-progress-deadline=2m \\
  --kubeconfig=/var/lib/kubelet/kubeconfig \\
  --network-plugin=cni \\
  --register-node=true \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

######################################################################################



################################# KUBE PROXY #######################################

sudo cp kube-proxy.kubeconfig /var/lib/kube-proxy/kubeconfig


cat <<EOF | sudo tee /var/lib/kube-proxy/kube-proxy-config.yaml
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
clientConnection:
  kubeconfig: "/var/lib/kube-proxy/kubeconfig"
mode: "iptables"
clusterCIDR: "192.168.0.0/16"
EOF


cat <<EOF | sudo tee /etc/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-proxy \\
  --config=/var/lib/kube-proxy/kube-proxy-config.yaml
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

######################################################################################

sudo systemctl daemon-reload
sudo systemctl enable containerd kubelet kube-proxy
sudo systemctl start containerd kubelet kube-proxy

cd ${CWD}