• linux安装k8s环境初始化


    一、基础环境配置

    1、检查操作系统版本

    # 此方式要求k8s集群要求在centos7.5版本或者以上版本
    

    [root@k8s-master /]# cat /etc/redhat-release
    CentOS Linux release 7.9.2009 (Core)

    2、主机名解析

    为了方便后面集群间的直接调用,配置主机名解析

    [root@k8s-master /]# cat /etc/hosts
    127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    192.168.174.128 k8s-master
    192.168.174.129 k8s-node1
    192.168.174.130 k8s-node2

    3、时间同步

    k8s要求集群中的节点时间必须精确一致,这里使用chronyd服务从网络同步时间# 启动chronyd服务

    # 启动服务

    [root@k8s-master /]# systemctl start chronyd

    # 设置服务自启动
    [root@k8s-master /]# systemctl enable chronyd

    # 查看时间
    [root@k8s-master /]# date
    2021年 09月 17日 星期五 15:55:26 CST

    4、禁用iptables和firewalld服务

    k8s运行中会产生大量的iptable规则,避免规则混淆,直接关闭系统原则

    [root@k8s-master /]# systemctl stop firewalld
    [root@k8s-master /]# systemctl disable firewalld
    [root@k8s-master /]# systemctl stop iptables
    [root@k8s-master /]# systemctl disable iptables

    5、禁用selinux

    selinux是linux系统的一个安全服务,如果不关闭将造成集群各种问题

    # 编辑、/etc/selinux/config 文件
    # 修改之后需要重启服务
    SELINUX=disabled

    6、禁用swap分区

    # 编辑分区配置文件 etc/fstab ,注释掉swap分区这一行
    [root@k8s-node2 /]# cat /etc/fstab
    
    #
    # /etc/fstab
    # Created by anaconda on Mon May 24 05:53:45 2021
    #
    # Accessible filesystems, by reference, are maintained under '/dev/disk'
    # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
    #
    /dev/mapper/centos-root /                       xfs     defaults        0 0
    UUID=34218ca8-2e15-49b3-86d7-2493ae5c58ae /boot                   xfs     defaults        0 0
    # /dev/mapper/centos-swap swap                    swap    defaults        0 0

     7、修改linux内核参数

    # 修改(添加)linux内核参数,天机网桥过滤和地址转发功能
    # 编辑 vim etc/sysctl.d/kubernetes.conf
    [root@k8s-master /]# vim etc/sysctl.d/kubernetes.conf
    
    net.bridge.bridge-nf-call-iptables=1
    net.bridge.bridge-nf-call-ip6tables=1
    net.ipv4.ip_forward=1
    
    

    # 重新加载配置

    [root@k8s-master /]# sysctl -p

    #加载网桥过滤模块

    [root@k8s-master /]# modprobe br_netfilter

    # 查看网桥过滤模块是否加载成功

    [root@k8s-master /]# lsmod | grep br_netfilter
    br_netfilter 22256 0
    bridge 151336 1 br_netfilter

     8、配置ipvs功能

     k8s配置使用ipvs为代理

    # 1、安装upset和ipvsadmin
    yum install ipset ipvsadm -y
    # 2、添加需要加载的模块写入脚本文件
    cat <<EOF > /etc/sysconfig/modules/ipvs.modules
    #!/bin/bash
    modprobe – ip_vs
    modprobe – ip_vs_rr
    modprobe – ip_vs_wrr
    modprobe – ip_vs_sh
    modprobe – nf_conntrack_ipv4
    EOF
    
    # 3、为脚本添加权限
    chmod +x /etc/sysconfig/modules/ipvs.modules
    
    # 4、执行脚本
    /bin/bash /etc/sysconfig/modules/ipvs.modules
    
    # 5、查看对应模块是否加载成功
    grep -e ip_vs -e nf_conntrack_ipv4

     9、重启服务

    reboot

    10、安装docker切换镜像

    wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
    1、査看当前镜像源中支持的docker版本
    yum list docker-ce --showduplicates
    2、安装特定版本的docker-ce
    #必须指定--setopt=obsoletes=0,否则yum#自动安装更高版本
    yum install docker-ce-19.03.15-3.el7 3、 添加一个配件 # Docker在默认情况下使用的Cgroup Driver为cgroupfs,而kubernetes荐庚用systemd来代曾cgroupfs # mkdir /etc/docker cat<<EOF > /etc/docker/daemon.json { "registry-mirrors": [ "https://kfwkfulq.mirror.aliyuncs.com", "https://2lqq34jg.mirror.aliyuncs.com", "https://pee6w651.mirror.aliyuncs.com", "https://registry.docker-cn.com", "http://hub-mirror.c.163.com"],
    "exec-opts":["native.cgroupdriver=systemd"] } EOF # 5 后动docker # systemctl restart docker

     11、安装k8s组件

    # 由于kubernetes的镜像源在国外,速度比较慢,这里切换成国内的镜像源
    # 编辑 /etc/yum.repos.d/kubernetes.repo,添加下面的配置
    
    cat <<EOF > /etc/yum.repos.d/kubernetes.repo
    [kubernetes]
    name=Kubernetes
    baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
    enabled=1
    gpgcheck=0
    repo_gpgcheck=0
    gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
    http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
    
    
    # 安装kubeadnu kubelet和kubectl(制定版本)
    # yum install --setopt=obsoletes=0 kubeadm-1.17.4 kubelet-1.17.4 kubectl-1.17.4 -y

      #安装最新版本,也可安装指定版本
      yum install -y kubelet kubeadm kubectl

       #查看kubelet版本
    kubelet --version
    #查看kubeadm版本
    kubeadm version
    #重新加载配置文件
    systemctl daemon-reload
    
    #启动kubelet
    systemctl start kubelet
    
    #查看kubelet启动状态
    systemctl status kubelet
    #没启动成功,报错先不管,后面的kubeadm init会拉起
    
    #设置开机自启动
    systemctl enable kubelet
    
    #查看kubelet开机启动状态 enabled:开启, disabled:关闭
    systemctl is-enabled kubelet
    
    #查看日志
    journalctl -xefu kubelet
    # 配置 kubelet的cgroup
    
    # 编辑 /etc/sysconfig/kubelet,添加下面的配置 
    KUBELET_CGROUP_ARGS="--cgroup-driver=systemd"
    KUBE_PROXY_MODE="ipvs"
    
    # 设置kubelet幵机自启 
    # systemctl enable kubelet

    二、集群初始化

    1、准备镜像文件

    #查看k8s组件版本
    kubeadm config images list
    #通过国内镜像仓库下载所需的镜像文件 docker pull registry.cn
    -hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.17.4 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.17.4 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.17.4 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.17.4 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.3-0 docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.5 #更改镜像名称 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.17.4 k8s.gcr.io/kube-apiserver:v1.17.4 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.17.4 k8s.gcr.io/kube-controller-manager:v1.17.4 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.17.4 k8s.gcr.io/kube-scheduler:v1.17.4 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.17.4 k8s.gcr.io/kube-proxy:v1.17.4 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.3-0 k8s.gcr.io/etcd:3.4.3-0 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.5 k8s.gcr.io/coredns:1.6.5 #删除原先的镜像 docker image rm registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.17.4 docker image rm registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.17.4 docker image rm registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.17.4 docker image rm registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.17.4 docker image rm registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 docker image rm registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.3-0 docker image rm registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.5

    2、初始化集群(master节点)

    #执行初始化命令,创建集群
    kubeadm init --kubernetes-version v1.17.4 --pod-network-cidr 10.244.0.0/16 --ignore-preflight-errors=NumCPU

    #创建必要的文件

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

    #查看节点
    kubectl get node

     

    初始化错误解决办法:

    #删除文件
    /var/lib/kubelet/kubeadm-flags.env
    /var/lib/kubelet/config.yaml
    /etc/kubernetes
    #执行脚本
    swapoff -a
    kubeadm reset
    systemctl daemon-reload
    systemctl restart kubelet
    iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X  
    # 重新执行初始化脚本

    3、node节点加入集群(node节点)

    kubeadm join 192.168.174.128:6443 --token x818xi.jzxi4utggs081p71 
    --discovery-token-ca-cert-hash sha256:b6e3b74bf2eb2c7dce03225b1993a03f747700c74cc75b6b1dea9712bdc3cdfa

     4、安装网络插件(master节点)

    #创建文件夹
    mkdir flannel && cd flannel
    #下载文件
    curl -O https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
    # kube-flannel.yml里需要下载镜像,我这里提前先下载
    docker pull quay.io/coreos/flannel:v0.14.0-rc1
    #创建flannel网络插件
    kubectl apply -f kube-flannel.yml
    
    #过一会查看k8s集群节点,变成Ready状态了
    kubectl get nodes

    [root@k8s-master flannel]# kubectl get nodes


    NAME STATUS ROLES AGE VERSION
    k8s-master Ready master 21m v1.17.4
    k8s-node1 Ready <none> 4m37s v1.17.4
    k8s-node2 Ready <none> 17m v1.17.4

     

    搞定,但是 raw.githubusercontent.com已经被墙了,这里放上kube-flannel.yml文件的源码

    cat <<EOF > kube-flannel.yml
    ---
    apiVersion: policy/v1beta1
    kind: PodSecurityPolicy
    metadata:
      name: psp.flannel.unprivileged
      annotations:
        seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
        seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
        apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
        apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
    spec:
      privileged: false
      volumes:
        - configMap
        - secret
        - emptyDir
        - hostPath
      allowedHostPaths:
        - pathPrefix: "/etc/cni/net.d"
        - pathPrefix: "/etc/kube-flannel"
        - pathPrefix: "/run/flannel"
      readOnlyRootFilesystem: false
      # Users and groups
      runAsUser:
        rule: RunAsAny
      supplementalGroups:
        rule: RunAsAny
      fsGroup:
        rule: RunAsAny
      # Privilege Escalation
      allowPrivilegeEscalation: false
      defaultAllowPrivilegeEscalation: false
      # Capabilities
      allowedCapabilities: ['NET_ADMIN']
      defaultAddCapabilities: []
      requiredDropCapabilities: []
      # Host namespaces
      hostPID: false
      hostIPC: false
      hostNetwork: true
      hostPorts:
      - min: 0
        max: 65535
      # SELinux
      seLinux:
        # SELinux is unused in CaaSP
        rule: 'RunAsAny'
    ---
    kind: ClusterRole
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
      name: flannel
    rules:
      - apiGroups: ['extensions']
        resources: ['podsecuritypolicies']
        verbs: ['use']
        resourceNames: ['psp.flannel.unprivileged']
      - apiGroups:
          - ""
        resources:
          - pods
        verbs:
          - get
      - apiGroups:
          - ""
        resources:
          - nodes
        verbs:
          - list
          - watch
      - apiGroups:
          - ""
        resources:
          - nodes/status
        verbs:
          - patch
    ---
    kind: ClusterRoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
      name: flannel
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: flannel
    subjects:
    - kind: ServiceAccount
      name: flannel
      namespace: kube-system
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: flannel
      namespace: kube-system
    ---
    kind: ConfigMap
    apiVersion: v1
    metadata:
      name: kube-flannel-cfg
      namespace: kube-system
      labels:
        tier: node
        app: flannel
    data:
      cni-conf.json: |
        {
          "name": "cbr0",
          "cniVersion": "0.3.1",
          "plugins": [
            {
              "type": "flannel",
              "delegate": {
                "hairpinMode": true,
                "isDefaultGateway": true
              }
            },
            {
              "type": "portmap",
              "capabilities": {
                "portMappings": true
              }
            }
          ]
        }
      net-conf.json: |
        {
          "Network": "10.244.0.0/16",
          "Backend": {
            "Type": "vxlan"
          }
        }
    ---
    apiVersion: apps/v1
    kind: DaemonSet
    metadata:
      name: kube-flannel-ds-amd64
      namespace: kube-system
      labels:
        tier: node
        app: flannel
    spec:
      selector:
        matchLabels:
          app: flannel
      template:
        metadata:
          labels:
            tier: node
            app: flannel
        spec:
          affinity:
            nodeAffinity:
              requiredDuringSchedulingIgnoredDuringExecution:
                nodeSelectorTerms:
                  - matchExpressions:
                      - key: beta.kubernetes.io/os
                        operator: In
                        values:
                          - linux
                      - key: beta.kubernetes.io/arch
                        operator: In
                        values:
                          - amd64
          hostNetwork: true
          tolerations:
          - operator: Exists
            effect: NoSchedule
          serviceAccountName: flannel
          initContainers:
          - name: install-cni
            image: quay.io/coreos/flannel:v0.11.0-amd64
            command:
            - cp
            args:
            - -f
            - /etc/kube-flannel/cni-conf.json
            - /etc/cni/net.d/10-flannel.conflist
            volumeMounts:
            - name: cni
              mountPath: /etc/cni/net.d
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          containers:
          - name: kube-flannel
            image: quay.io/coreos/flannel:v0.11.0-amd64
            command:
            - /opt/bin/flanneld
            args:
            - --ip-masq
            - --kube-subnet-mgr
            resources:
              requests:
                cpu: "100m"
                memory: "50Mi"
              limits:
                cpu: "100m"
                memory: "50Mi"
            securityContext:
              privileged: false
              capabilities:
                add: ["NET_ADMIN"]
            env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            volumeMounts:
            - name: run
              mountPath: /run/flannel
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          volumes:
            - name: run
              hostPath:
                path: /run/flannel
            - name: cni
              hostPath:
                path: /etc/cni/net.d
            - name: flannel-cfg
              configMap:
                name: kube-flannel-cfg
    ---
    apiVersion: apps/v1
    kind: DaemonSet
    metadata:
      name: kube-flannel-ds-arm64
      namespace: kube-system
      labels:
        tier: node
        app: flannel
    spec:
      selector:
        matchLabels:
          app: flannel
      template:
        metadata:
          labels:
            tier: node
            app: flannel
        spec:
          affinity:
            nodeAffinity:
              requiredDuringSchedulingIgnoredDuringExecution:
                nodeSelectorTerms:
                  - matchExpressions:
                      - key: beta.kubernetes.io/os
                        operator: In
                        values:
                          - linux
                      - key: beta.kubernetes.io/arch
                        operator: In
                        values:
                          - arm64
          hostNetwork: true
          tolerations:
          - operator: Exists
            effect: NoSchedule
          serviceAccountName: flannel
          initContainers:
          - name: install-cni
            image: quay.io/coreos/flannel:v0.11.0-arm64
            command:
            - cp
            args:
            - -f
            - /etc/kube-flannel/cni-conf.json
            - /etc/cni/net.d/10-flannel.conflist
            volumeMounts:
            - name: cni
              mountPath: /etc/cni/net.d
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          containers:
          - name: kube-flannel
            image: quay.io/coreos/flannel:v0.11.0-arm64
            command:
            - /opt/bin/flanneld
            args:
            - --ip-masq
            - --kube-subnet-mgr
            resources:
              requests:
                cpu: "100m"
                memory: "50Mi"
              limits:
                cpu: "100m"
                memory: "50Mi"
            securityContext:
              privileged: false
              capabilities:
                 add: ["NET_ADMIN"]
            env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            volumeMounts:
            - name: run
              mountPath: /run/flannel
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          volumes:
            - name: run
              hostPath:
                path: /run/flannel
            - name: cni
              hostPath:
                path: /etc/cni/net.d
            - name: flannel-cfg
              configMap:
                name: kube-flannel-cfg
    ---
    apiVersion: apps/v1
    kind: DaemonSet
    metadata:
      name: kube-flannel-ds-arm
      namespace: kube-system
      labels:
        tier: node
        app: flannel
    spec:
      selector:
        matchLabels:
          app: flannel
      template:
        metadata:
          labels:
            tier: node
            app: flannel
        spec:
          affinity:
            nodeAffinity:
              requiredDuringSchedulingIgnoredDuringExecution:
                nodeSelectorTerms:
                  - matchExpressions:
                      - key: beta.kubernetes.io/os
                        operator: In
                        values:
                          - linux
                      - key: beta.kubernetes.io/arch
                        operator: In
                        values:
                          - arm
          hostNetwork: true
          tolerations:
          - operator: Exists
            effect: NoSchedule
          serviceAccountName: flannel
          initContainers:
          - name: install-cni
            image: quay.io/coreos/flannel:v0.11.0-arm
            command:
            - cp
            args:
            - -f
            - /etc/kube-flannel/cni-conf.json
            - /etc/cni/net.d/10-flannel.conflist
            volumeMounts:
            - name: cni
              mountPath: /etc/cni/net.d
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          containers:
          - name: kube-flannel
            image: quay.io/coreos/flannel:v0.11.0-arm
            command:
            - /opt/bin/flanneld
            args:
            - --ip-masq
            - --kube-subnet-mgr
            resources:
              requests:
                cpu: "100m"
                memory: "50Mi"
              limits:
                cpu: "100m"
                memory: "50Mi"
            securityContext:
              privileged: false
              capabilities:
                 add: ["NET_ADMIN"]
            env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            volumeMounts:
            - name: run
              mountPath: /run/flannel
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          volumes:
            - name: run
              hostPath:
                path: /run/flannel
            - name: cni
              hostPath:
                path: /etc/cni/net.d
            - name: flannel-cfg
              configMap:
                name: kube-flannel-cfg
    ---
    apiVersion: apps/v1
    kind: DaemonSet
    metadata:
      name: kube-flannel-ds-ppc64le
      namespace: kube-system
      labels:
        tier: node
        app: flannel
    spec:
      selector:
        matchLabels:
          app: flannel
      template:
        metadata:
          labels:
            tier: node
            app: flannel
        spec:
          affinity:
            nodeAffinity:
              requiredDuringSchedulingIgnoredDuringExecution:
                nodeSelectorTerms:
                  - matchExpressions:
                      - key: beta.kubernetes.io/os
                        operator: In
                        values:
                          - linux
                      - key: beta.kubernetes.io/arch
                        operator: In
                        values:
                          - ppc64le
          hostNetwork: true
          tolerations:
          - operator: Exists
            effect: NoSchedule
          serviceAccountName: flannel
          initContainers:
          - name: install-cni
            image: quay.io/coreos/flannel:v0.11.0-ppc64le
            command:
            - cp
            args:
            - -f
            - /etc/kube-flannel/cni-conf.json
            - /etc/cni/net.d/10-flannel.conflist
            volumeMounts:
            - name: cni
              mountPath: /etc/cni/net.d
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          containers:
          - name: kube-flannel
            image: quay.io/coreos/flannel:v0.11.0-ppc64le
            command:
            - /opt/bin/flanneld
            args:
            - --ip-masq
            - --kube-subnet-mgr
            resources:
              requests:
                cpu: "100m"
                memory: "50Mi"
              limits:
                cpu: "100m"
                memory: "50Mi"
            securityContext:
              privileged: false
              capabilities:
                 add: ["NET_ADMIN"]
            env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            volumeMounts:
            - name: run
              mountPath: /run/flannel
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          volumes:
            - name: run
              hostPath:
                path: /run/flannel
            - name: cni
              hostPath:
                path: /etc/cni/net.d
            - name: flannel-cfg
              configMap:
                name: kube-flannel-cfg
    ---
    apiVersion: apps/v1
    kind: DaemonSet
    metadata:
      name: kube-flannel-ds-s390x
      namespace: kube-system
      labels:
        tier: node
        app: flannel
    spec:
      selector:
        matchLabels:
          app: flannel
      template:
        metadata:
          labels:
            tier: node
            app: flannel
        spec:
          affinity:
            nodeAffinity:
              requiredDuringSchedulingIgnoredDuringExecution:
                nodeSelectorTerms:
                  - matchExpressions:
                      - key: beta.kubernetes.io/os
                        operator: In
                        values:
                          - linux
                      - key: beta.kubernetes.io/arch
                        operator: In
                        values:
                          - s390x
          hostNetwork: true
          tolerations:
          - operator: Exists
            effect: NoSchedule
          serviceAccountName: flannel
          initContainers:
          - name: install-cni
            image: quay.io/coreos/flannel:v0.11.0-s390x
            command:
            - cp
            args:
            - -f
            - /etc/kube-flannel/cni-conf.json
            - /etc/cni/net.d/10-flannel.conflist
            volumeMounts:
            - name: cni
              mountPath: /etc/cni/net.d
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          containers:
          - name: kube-flannel
            image: quay.io/coreos/flannel:v0.11.0-s390x
            command:
            - /opt/bin/flanneld
            args:
            - --ip-masq
            - --kube-subnet-mgr
            resources:
              requests:
                cpu: "100m"
                memory: "50Mi"
              limits:
                cpu: "100m"
                memory: "50Mi"
            securityContext:
              privileged: false
              capabilities:
                 add: ["NET_ADMIN"]
            env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            volumeMounts:
            - name: run
              mountPath: /run/flannel
            - name: flannel-cfg
              mountPath: /etc/kube-flannel/
          volumes:
            - name: run
              hostPath:
                path: /run/flannel
            - name: cni
              hostPath:
                path: /etc/cni/net.d
            - name: flannel-cfg
              configMap:
                name: kube-flannel-cfg
    EOF
    View Code

    5、服务验证(部署一个nginx服务)

    #部署nginx
    kubectl create deployment nginx --image=nginx:1.14-alpine
    #暴露端口
    kubectl expose deployment nginx --port=80 --type=NodePort
    #查看服务状态
    kubectl get pod
    kubectl get service/svc

    6、k8s版本问题解决办法

    [ERROR KubeletVersion]: the kubelet version is higher than the control plane version. This is not a supported version skew and may lead to a malfunctional cluster

     原因:

    Kubelet 和 Kubeadm 版本不一致导致

    查看kubelet 和 kubeadm 版本

    [root@k8s-master01 cluster]# kubelet --version
    Kubernetes v1.19.3
    [root@k8s-master01 cluster]# kubeadm version
    kubeadm version: &version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.0", GitCommit:"641856db18352033a0d96dbc99153fa3b27298e5", GitTreeState:"clean", BuildDate:"2019-03-25T15:51:21Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
    [root@k8s-master01 cluster]# 

    解决办法:

    重新安装对应的 kubelet 版本

    yum -y remove kubelet
    yum  -y  install kubelet-1.14.0 kubeadm-1.14.0 kubectl-1.14.0 --disableexcludes=kubernetes

    启动服务

    systemctl enable kubelet && systemctl restart kubelet
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  • 原文地址:https://www.cnblogs.com/raorao1994/p/15305011.html
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