kubeadm初始化k8s

init

节点环境准备

• 关闭swap

  # 查看
  sudo swapon --show
  # 关闭
  sudo swapoff -a

• 配置其它：

  # sudo vim /etc/sysctl.d/k8s.conf
  # 添加： 
  net.ipv4.ip_forward = 1
  
  # 导出配置
  containerd config default > /etc/containerd/config.toml
  # 修改配置
  [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
    ...
    [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
      SystemdCgroup = true
  
  # 执行命令
  sudo modprobe br_netfilter
  sudo systemctl restart containerd

• 按正常流程安装完docker, containerd组件

默认安装

• kubeadm初始化

  # 以containerd作为运行时
  NODENAME=$(hostname -s) \
  && KUBERNETES_VERSION="v1.25.6" \
  && MASTER_IP=$(ip addr show enp3s0f0 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1)
  sudo kubeadm init --image-repository=registry.aliyuncs.com/google_containers  \
   --pod-network-cidr="192.168.0.0/16" \
   --service-cidr="10.96.0.0/12"  \
   --kubernetes-version $KUBERNETES_VERSION  \
   --apiserver-advertise-address $MASTER_IP  \
   --node-name $NODENAME \
   --cri-socket unix:///run/containerd/containerd.sock \
   --control-plane-endpoint=atms-01.vm
  
  kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/tigera-operator.yaml \
      -f https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/custom-resources.yaml
  
  kubectl  taint node atms-02 node-role.kubernetes.io/control-plane:NoSchedule-

修改CIDR

• 在一些k8s安装要求下，可能需要修改pod CIDR或service CIDR，可通过如下方式安装：

  当前修改service CIDR没生效，所以只演示修改pod CIDR

• kubeadm初始化

  # 以containerd作为运行时
  NODENAME=$(hostname -s) \
  && KUBERNETES_VERSION="v1.25.6" \
  && MASTER_IP=$(ip addr show enp0s31f6 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1)
  sudo kubeadm init --image-repository=registry.aliyuncs.com/google_containers  \
   --pod-network-cidr="192.169.0.0/16" \
   --service-cidr="10.96.0.0/12"  \
   --kubernetes-version $KUBERNETES_VERSION  \
   --apiserver-advertise-address $MASTER_IP  \
   --node-name $NODENAME \
   --cri-socket unix:///run/containerd/containerd.sock \
   --control-plane-endpoint=atms-02.vm
  
  kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/tigera-operator.yaml 
  
  kubectl  taint node atms-02 node-role.kubernetes.io/control-plane:NoSchedule-

• 修改calico：

  # wget https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/custom-resources.yaml
  # 修改内容如下：
  # 自定义calico custom-resource.yaml配置自定义CIDR
  # This section includes base Calico installation configuration.
  # For more information, see: https://projectcalico.docs.tigera.io/master/reference/installation/api#operator.tigera.io/v1.Installation
  apiVersion: operator.tigera.io/v1
  kind: Installation
  metadata:
    name: default
  spec:
    # Configures Calico networking.
    calicoNetwork:
      # Note: The ipPools section cannot be modified post-install.
      ipPools:
      - blockSize: 26
        cidr: 192.169.0.0/16
        encapsulation: VXLANCrossSubnet
        natOutgoing: Enabled
        nodeSelector: all()
    #serviceCIDRs:
    #- 10.97.0.0/12
  
  ---
  
  # This section configures the Calico API server.
  # For more information, see: https://projectcalico.docs.tigera.io/master/reference/installation/api#operator.tigera.io/v1.APIServer
  apiVersion: operator.tigera.io/v1
  kind: APIServer 
  metadata: 
    name: default 
  spec: {}

reset

• 通过如下命令重置k8s节点，如在执行kubeadm init或kubeadm join后可通过下面命令重置节点：

  sudo kubeadm reset