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multi-node-installation-docker.md

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Install tools and dependency

On all Servers

echo "Change hostname"
hostnamectl set-hostname

echo "update and upgrade"
apt update ; apt upgrade -y

echo "install tools"
apt install -y wget git vim bash-completion curl htop net-tools dnsutils \
               atop sudo software-properties-common telnet axel jq iotop

echo "nodes ip address"
master1_ip=192.168.1.141
master2_ip=192.168.1.146
master3_ip=192.168.1.145
worker1_ip=192.168.1.150
worker2_ip=192.168.1.148
worker3_ip=192.168.1.147
lb_api1_ip=192.168.1.154
lb_api2_ip=192.168.1.155
lb_ingress1_ip=192.168.1.157
lb_ingress2_ip=192.168.1.163
vip_api=192.168.1.44
vip_ingress=192.168.1.45
storage_ip=192.168.1.158

echo "nodes name"
master1_name=master1
master2_name=master2
master3_name=master3
worker1_name=worker1
worker2_name=worker2
worker3_name=worker3
vip_api_name=api

echo "domain name"
domain_name=monlog.ir

Install and configuration docker

On all Servers

echo -e "Docker Installation" 
which docker || { curl -fsSL https://get.docker.com | bash; }
{
systemctl enable docker
systemctl restart docker
systemctl is-active --quiet docker && echo -e "\e[1m \e[96m docker service: \e[30;48;5;82m \e[5mRunning \e[0m" || echo -e "\e[1m \e[96m docker service: \e[30;48;5;196m \e[5mNot Running \e[0m"
}

echo "Configur docker daemon "
DOCKER_DEST=/etc/systemd/system/docker.service.d/
if [ -d $DOCKER_DEST ] ; then
   echo "file exist"
else
   mkdir -p /etc/systemd/system/docker.service.d/
   touch /etc/systemd/system/docker.service.d/override.conf
fi   

cat <<EOT > /etc/systemd/system/docker.service.d/override.conf
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd --log-opt max-size=100m --log-opt max-file=5
EOT
cat /etc/systemd/system/docker.service.d/override.conf
{
systemctl daemon-reload
systemctl restart docker
systemctl is-active --quiet docker && echo -e "\e[1m \e[96m docker service: \e[30;48;5;82m \e[5mRunning \e[0m" || echo -e "\e[1m \e[96m docker service: \e[30;48;5;196m \e[5mNot Running \e[0m"
}

echo "how to fix WARNING: No swap limit support"
cat /etc/default/grub
echo "GRUB_CMDLINE_LINUX=\"cgroup_enable=memory swapaccount=1\"" >> /etc/default/grub
cat /etc/default/grub
sudo update-grub

Pre-configuration kubernetes

On master and worker nodes

echo "Add sysctl settings"
cat >>/etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system >/dev/null 2>&1

echo "Disable and turn off SWAP"
sed -i '/swap/d' /etc/fstab
swapoff -a

echo "Installing apt-transport-https pkg"
apt-get update && apt-get install -y apt-transport-https ca-certificates curl software-properties-common
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -

cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
ls -ltr /etc/apt/sources.list.d/kubernetes.list
cat /etc/apt/sources.list.d/kubernetes.list
apt-get update -y

echo "Install Kubernetes kubeadm, kubelet and kubectl"
apt-get install -y kubelet=1.21.0-00
apt-get install -y kubectl=1.21.0-00
apt-get install -y kubeadm=1.21.0-00

echo "check versions tools"
kubelet --version
kubeadm version
kubectl version

echo "Enable and start kubelet service"
systemctl enable kubelet
systemctl start kubelet
systemctl status kubelet

haproxy and keepalived install and configuration

On API loadbalancer nodes

echo "install haproxy and keepalived service"
apt install -y haproxy keepalived

echo "copy and move haproxy config"
cat /etc/haproxy/haproxy.cfg
cat <<EOT >> /etc/haproxy/haproxy.cfg
listen Stats-Page
  bind *:8000
  mode http
  stats enable
  stats hide-version
  stats refresh 10s
  stats uri /
  stats show-legends
  stats show-node

frontend fe-apiserver
   bind 0.0.0.0:6443
   mode tcp
   option tcplog
   default_backend be-apiserver

backend be-apiserver
   mode tcp
   option tcp-check
   balance roundrobin
   default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
   server control-plane-1 ${master1_ip}:6443 check
   server control-plane-2 ${master2_ip}:6443 check
   server control-plane-3 ${master3_ip}:6443 check
EOT
cat /etc/haproxy/haproxy.cfg

echo "check haproxy config file"
haproxy -c -f /etc/haproxy/haproxy.cfg

echo "Enable and start haproxy service"
{
systemctl enable haproxy
systemctl restart haproxy
systemctl is-active --quiet haproxy && echo -e "\e[1m \e[96m haproxy service: \e[30;48;5;82m \e[5mRunning \e[0m" || echo -e "\e[1m \e[96m docker service: \e[30;48;5;196m \e[5mNot Running \e[0m"
}

echo "check haproxy status page"
netstat -ntlp | grep 8000

On Master API loadbalancer node

cat <<EOT > /etc/keepalived/keepalived.conf
global_defs {
   enable_script_security
   script_user root
}

vrrp_script check_haproxy {
   script "killall -0 haproxy"
   interval 2
   weight 2
   }

vrrp_instance KUBE_API_LB {
   state MASTER
   interface ens160
   virtual_router_id 51
   priority 101
   # The virtual ip address shared between the two loadbalancers
   virtual_ipaddress {
      ${vip_api}/32
   }
   track_script {
      check_haproxy
   }
}
EOT
cat /etc/keepalived/keepalived.conf

echo "check keepalived config file"
keepalived -t -l -f /etc/keepalived/keepalived.conf

echo "Enable and start keepalived service"
{
systemctl enable keepalived
systemctl restart keepalived
systemctl is-active --quiet keepalived && echo -e "\e[1m \e[96m keepalived service: \e[30;48;5;82m \e[5mRunning \e[0m" || echo -e "\e[1m \e[96m docker service: \e[30;48;5;196m \e[5mNot Running \e[0m"
}

echo "check vip"
ip a | grep 192.168.1.44/32

On Slave API loadbalancer node

cat <<EOT > /etc/keepalived/keepalived.conf
global_defs {
   enable_script_security
   script_user root
}
# Script used to check if HAProxy is running
vrrp_script check_haproxy {
   script "killall -0 haproxy"
   interval 2
   weight 2
}

vrrp_instance KUBE_API_LB {
   state BACKUP
   interface ens160
   virtual_router_id 51
   priority 100
   virtual_ipaddress {
      ${vip_api}/32
   }
   track_script {
      check_haproxy
   }
}
EOT

cat /etc/keepalived/keepalived.conf
echo "check keepalived config file"
keepalived -t -l -f /etc/keepalived/keepalived.conf

echo "Enable and start keepalived service"
{
systemctl enable keepalived
systemctl restart keepalived
systemctl is-active --quiet keepalived && echo -e "\e[1m \e[96m keepalived service: \e[30;48;5;82m \e[5mRunning \e[0m" || echo -e "\e[1m \e[96m docker service: \e[30;48;5;196m \e[5mNot Running \e[0m"
}

echo "check vip"
ip a | grep 192.168.1.44/32

kubeadm config

On master1

echo "create kubeadm config file"
cat <<EOT >/opt/kubeadm_config.yml
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: ${master1_ip}
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: master1
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  extraArgs:
    authorization-mode: "Node,RBAC"
  timeoutForControlPlane: 4m0s
  certSANs:
  - "${vip_api}"
  - "${master1_ip}"
  - "${master2_ip}"
  - "${master3_ip}"
  - "${vip_api_name}"
  - "vip"
  - "${master1_name}"
  - "${master2_name}"
  - "${master3_name}"
  - "vip.${domain_name}"
  - "${vip_api_name}.${domain_name}"
  - "${master1_name}.${domain_name}"
  - "${master2_name}.${domain_name}"
  - "${master3_name}.${domain_name}"
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    imageRepository: "quay.io/coreos"
    imageTag: "v3.4.16"
    dataDir: "/var/lib/etcd"
    serverCertSANs:
      - "${vip_api}"
      - "${master1_ip}"
      - "${master2_ip}"
      - "${master3_ip}"
      - "${vip_api_name}"
      - "vip"
      - "${master1_name}"
      - "${master2_name}"
      - "${master3_name}"
      - "${vip_api_name}.${domain_name}"
      - "${master1_name}.${domain_name}"
      - "${master2_name}.${domain_name}"
      - "${master3_name}.${domain_name}"
    peerCertSANs:
      - "${vip_api}"
      - "${master1_ip}"
      - "${master2_ip}"
      - "${master3_ip}"
      - "${vip_api_name}"
      - "vip"
      - "${master1_name}"
      - "${master2_name}"
      - "${master3_name}"
      - "${vip_api_name}.${domain_name}"
      - "${master1_name}.${domain_name}"
      - "${master2_name}.${domain_name}"
      - "${master3_name}.${domain_name}"
#kubernetesVersion: "v1.21.1"
imageRepository: "k8s.gcr.io"
useHyperKubeImage: false
kind: ClusterConfiguration
controlPlaneEndpoint: "vip.${domain_name}:6443"
networking:
  serviceSubnet: "10.96.0.0/12"
  podSubnet: "172.124.0.0/17"
EOT
cat /opt/kubeadm_config.yml

echo "Get images list" 
kubeadm config images list --config /opt/kubeadm_config.yml
kubeadm config images pull --config /opt/kubeadm_config.yml

before kubeadm init run these steps:

  • pull all docker images
  • dns recorde add and check
echo "initalize master1"
kubeadm init --config /opt/kubeadm_config.yml

echo "kubectl config"
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

echo "check certificate"
kubeadm certs check-expiration
openssl x509 -text -noout -in /etc/kubernetes/pki/apiserver.crt 

echo "Deploy Calico network"
kubectl create -f https://docs.projectcalico.org/v3.9/manifests/calico.yaml

echo "Install etcdctl On Ubuntu 16.04/18.04 "
etcd_version=v3.4.16
curl -L https://github.com/coreos/etcd/releases/download/$etcd_version/etcd-$etcd_version-linux-amd64.tar.gz -o etcd-$etcd_version-linux-amd64.tar.gz
tar xzvf etcd-$etcd_version-linux-amd64.tar.gz
rm etcd-$etcd_version-linux-amd64.tar.gz
cp etcd-$etcd_version-linux-amd64/etcdctl /usr/local/bin/
rm -rf etcd-$etcd_version-linux-amd64
etcdctl version

echo "check etcd server on master nodes"
export endpoint="https://${master1_ip}:2379,${master2_ip}:2379,${master3_ip}:2379"
export flags="--cacert=/etc/kubernetes/pki/etcd/ca.crt \
              --cert=/etc/kubernetes/pki/etcd/server.crt \
              --key=/etc/kubernetes/pki/etcd/server.key"
endpoints=$(sudo ETCDCTL_API=3 etcdctl member list $flags --endpoints=${endpoint} \
            --write-out=json | jq -r '.members | map(.clientURLs) | add | join(",")')

echo "verify with these commands"
sudo ETCDCTL_API=3 etcdctl $flags --endpoints=${endpoints} member list
sudo ETCDCTL_API=3 etcdctl $flags --endpoints=${endpoints} endpoint status
sudo ETCDCTL_API=3 etcdctl $flags --endpoints=${endpoints} endpoint health
sudo ETCDCTL_API=3 etcdctl $flags --endpoints=${endpoints} alarm list

etcdctl member list $flags --endpoints=${endpoint} --write-out=table
etcdctl endpoint status $flags --endpoints=${endpoint} --write-out=table

master and worker join cluster

after initializing master 1 run these steps

  • join master2:

    • check pod
    • check nodes
    • check etcd cluster ‍

  • join master3:

    • check pod
    • check nodes
    • check etcd cluster

  • join worker1,2,3:

    • check pod
    • check nodes