K8S集群 阿里云ECS异地部署

阿里云服务器，异地部署k8s集群

参考：https://blog.csdn.net/chen645800876/article/details/105833835

问题：由于在使用云服务器时，内网几乎是ping不通的，在使用内网进行注册时，会导致节点之间不能正常通信。

为了方便，把参考博客的内容提取整合下，方便下次操作。这里介绍的是使用虚拟网卡+kubeadm安装。

主机名 配置 系统
master01 2核4G Alibaba Cloud Linux (内核 4.19.91-21.al7.x86_64)
work01 2核4G Alibaba Cloud Linux (内核 4.19.91-21.al7.x86_64)
....

建议，系统内核版本啥的不要差别太大。

准备工作

  • 在阿里云后台开放下安全组

    • 10250/10260 TCP端口：给kube-schedule、kube-controll，kube-proxy、kubelet`等使用

    • 6443 TCP端口：给kube-apiserver`使用

    • 2379 2380 2381 TCP

    • 8472 UDP端口：vxlan`使用端口

  • 调整内核参数

    cat > k8s.conf <<EOF
#开启网桥模式
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
#开启转发
net.ipv4.ip_forward = 1
##关闭ipv6
net.ipv6.conf.all.disable_ipv6=1
EOF
cp k8s.conf /etc/sysctl.d/k8s.conf
sysctl -p /etc/sysctl.d/k8s.conf

  • 调整系统时区

    # 设置系统时区为 中国/上海
timedatectl set-timezone Asia/Shanghai
# 将当前的UTC时间写入硬件时钟
timedatectl set-local-rtc 0
# 重启依赖于系统时间的服务
systemctl restart rsyslog
systemctl restart crond

  • 关闭系统不需要的服务

    #关闭邮件服务
systemctl stop postfix && systemctl disable postfix

  • 设置rsyslogd和systemd journald

    默认有两个日志服务，使用journald关闭rsyslogd

    mkdir /var/log/journal # 持久化保存日志的目录
mkdir /etc/systemd/journald.conf.d
cat > /etc/systemd/journald.conf.d/99-prophet.conf <<EOF
[Journal]
# 持久化
Storage=persistent

# 压缩历史日志
Compress=yes

SysnIntervalSec=5m
RateLimitInterval=30s
RateLimitBurst=1000

# 最大占用空间 10G
SystemMaxUse=10G

# 单日志文件最大 200M
SystemMaxFileSize=200M

# 日志保存时间 2 周
MaxRetentionSec=2week

# 不将日志转发到 syslog
ForwardToSyslog=no

EOF

systemctl restart systemd-journald

  • ipvs前置条件准备

    ipvs转发效率比iptables更高,看上去也比iptables舒服

    # step1
modprobe br_netfilter

# step2
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF

# step3
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/

  • Docker安装

    # step 1: 安装必要的一些系统工具
yum install -y yum-utils device-mapper-persistent-data lvm2
# Step 2: 添加软件源信息
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# Step 3: 更新并安装Docker-CE
yum makecache fast
yum -y install docker-ce
# Step 4: 开启Docker服务
systemctl start docker

# 创建 `/etc/docker`目录
mkdir -p /etc/docker

# 配置 `daemon`
cat > /etc/docker/daemon.json << EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  }
}
EOF

# 启动docker
systemctl daemon-reload && systemctl restart docker && systemctl enable docker

  • 关闭swap分区

    swapoff -a

  • 配置镜像加速器

    针对Docker客户端版本大于 1.10.0 的用户

    您可以通过修改daemon配置文件/etc/docker/daemon.json来使用加速器

    sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://ckwu66hv.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

  • Kubeadm、Kubelet、Kubectl安装

    这里使用kebernetes v1.18.0版本
    # 添加源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

# 关闭selinux
setenforce 0

# 安装kubelet、kubeadm、kubectl
yum -y install kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0

# 设置为开机自启
systemctl enable kubelet

  • 建立虚拟网卡（所有节点）

    # step1 ，注意替换你的公网IP进去
cat > /etc/sysconfig/network-scripts/ifcfg-eth0:1 <<EOF
BOOTPROTO=static
DEVICE=eth0:1
IPADDR=你的公网IP
PREFIX=32
TYPE=Ethernet
USERCTL=no
ONBOOT=yes
EOF
# step2 如果是centos8，需要重启
systemctl restart network
# step3 查看新建的IP是否进去
ip addr

  • 修改kubelet启动参数（重点，所有节点都要操作）

    # 此文件安装kubeadm后就存在了
vim /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf

# 注意，这步很重要，如果不做，节点仍然会使用内网IP注册进集群
# 在末尾添加参数 --node-ip=公网IP

# Note: This dropin only works with kubeadm and kubelet v1.11+
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
EnvironmentFile=-/etc/sysconfig/kubelet
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS  $KUBELET_EXTRA_ARGS --node-ip=公网IP

  • 使用kubeadm初始化主节点（主节点）

    使用下面命令，查看需要拉取的镜像列表

    kubeadm config images list

    执行下面命令:

    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.18.10
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.18.10
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.18.10
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.18.10
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.3-0
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.7
docker pull quay.io/coreos/flannel:v0.13.0-rc2

    重新tag一下

    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.18.10 k8s.gcr.io/kube-apiserver:v1.18.10
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.18.10 k8s.gcr.io/kube-controller-manager:v1.18.10
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.18.10 k8s.gcr.io/kube-scheduler:v1.18.10
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.18.10 k8s.gcr.io/kube-proxy:v1.18.10
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2 k8s.gcr.io/pause:3.2
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:1.6.7 k8s.gcr.io/coredns:1.6.7

    # step1 添加配置文件，注意替换下面的IP
cat > kubeadm-config.yaml <<EOF
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.18.0
apiServer:
  certSANs:    #填写所有kube-apiserver节点的hostname、IP、VIP
  - master    #请替换为hostname
  - 47.74.22.13   #请替换为公网
  - 175.24.19.12  #请替换为私网
  - 10.96.0.1   #不要替换，此IP是API的集群地址，部分服务会用到
controlPlaneEndpoint: 47.74.22.13:6443 #替换为公网IP
networking:
  podSubnet: 10.244.0.0/16
  serviceSubnet: 10.96.0.0/12
--- 将默认调度方式改为ipvs
apiVersion: kubeproxy-config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
  SupportIPVSProxyMode: true
mode: ipvs
EOF

# step2 如果是1核心或者1G内存的请在末尾添加参数（--ignore-preflight-errors=all），否则会初始化失败
# 同时注意，此步骤成功后，会打印，两个重要信息
kubeadm init --config=kubeadm-config.yaml 

# 信息1 上面初始化成功后，将会生成kubeconfig文件，用于请求api服务器，请执行下面操作
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# 信息2 此信息用于后面工作节点加入主节点使用
kubeadm join 47.74.22.13:6443 --token sdfs.dsfsdfsdfijdth \
    --discovery-token-ca-cert-hash sha256:sdfsdfsdfsdfsdfsdfsdfsdfg9a460f44b11805009124

  • 修改kube-apiserver参数（主节点）

    # 修改两个信息，添加--bind-address和修改--advertise-address
vim /etc/kubernetes/manifests/kube-apiserver.yaml

apiVersion: v1
kind: Pod
metadata:
  annotations:
    kubeadm.kubernetes.io/kube-apiserver.advertise-address.endpoint: 47.74.22.13:6443
  creationTimestamp: null
  labels:
    component: kube-apiserver
    tier: control-plane
  name: kube-apiserver
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-apiserver
    - --advertise-address=47.74.22.13  #修改为公网IP
    - --bind-address=0.0.0.0 #添加此参数
    - --allow-privileged=true
    - --authorization-mode=Node,RBAC
    - --client-ca-file=/etc/kubernetes/pki/ca.crt
    - --enable-admission-plugins=NodeRestriction
    - --enable-bootstrap-token-auth=true
    - --etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt
    - --etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt
    - --etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key
    - --etcd-servers=https://127.0.0.1:2379
    - --insecure-port=0
    - --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt
    - --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key
    - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
    - --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
    - --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
    - --requestheader-allowed-names=front-proxy-client
    - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
    - --requestheader-extra-headers-prefix=X-Remote-Extra-
    - --requestheader-group-headers=X-Remote-Group
    - --requestheader-username-headers=X-Remote-User
    - --secure-port=6443
    - --service-account-key-file=/etc/kubernetes/pki/sa.pub
    - --service-cluster-ip-range=10.96.0.0/12
    - --tls-cert-file=/etc/kubernetes/pki/apiserver.crt
    - --tls-private-key-file=/etc/kubernetes/pki/apiserver.key
    image: k8s.gcr.io/kube-apiserver:v1.18.0
    imagePullPolicy: IfNotPresent
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 175.24.19.12
        path: /healthz
        port: 6443
        scheme: HTTPS
      initialDelaySeconds: 15
      timeoutSeconds: 15
    name: kube-apiserver
    resources:
      requests:
        cpu: 250m
    volumeMounts:
    - mountPath: /etc/ssl/certs
      name: ca-certs
      readOnly: true
    - mountPath: /etc/pki
      name: etc-pki
      readOnly: true
    - mountPath: /etc/kubernetes/pki
      name: k8s-certs
      readOnly: true
  hostNetwork: true
  priorityClassName: system-cluster-critical
  volumes:
  - hostPath:
      path: /etc/ssl/certs
      type: DirectoryOrCreate
    name: ca-certs
  - hostPath:
      path: /etc/pki
      type: DirectoryOrCreate
    name: etc-pki
  - hostPath:
      path: /etc/kubernetes/pki
      type: DirectoryOrCreate
    name: k8s-certs
status: {}

  • 工作节点加入集群（工作节点）

    先拉取好相关镜像

    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.18.10
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.18.10
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.7
docker pull quay.io/coreos/flannel:v0.13.0-rc2


docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.18.10 k8s.gcr.io/kube-apiserver:v1.18.10
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.18.10 k8s.gcr.io/kube-proxy:v1.18.10
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2 k8s.gcr.io/pause:3.2
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.7 k8s.gcr.io/coredns:1.6.7

    加入

    kubeadm join 47.74.22.13:6443 --token sdfs.dsfsdfsdfijdth \
    --discovery-token-ca-cert-hash sha256:sdfsdfsdfsdfsdfsdfsdfsdfg9a460f44b118050091245c1d

  • 检查是否加入集群（主节点）

    # 成功后，INTERNAL-IP均显示公网IP
[root@master01 ~]# kubectl get nodes -o wide

    修改flannel文件并安装（主节点）

    # 下载flannel的yaml配置文件

# 共修改两个地方，一个是args下，添加
 args:
 - --public-ip=$(PUBLIC_IP) # 添加此参数，申明公网IP
 - --iface=eth0             # 添加此参数，绑定网卡
 
 
 # 然后是env下
 env:
 - name: PUBLIC_IP     #添加环境变量
   valueFrom:          
     fieldRef:          
       fieldPath: status.podIP 

    #创建flannel
kubectl apply -f flannel.yaml

  • 完整flannel.yaml

    ---
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', 'NET_RAW']
  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
  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: kubernetes.io/os
                operator: In
                values:
                - linux
      hostNetwork: true
      priorityClassName: system-node-critical
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.13.0-rc2
        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:v0.13.0-rc2
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --public-ip=$(PUBLIC_IP) 
        - --iface=eth0
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
            add: ["NET_ADMIN", "NET_RAW"]
        env:
        - name: PUBLIC_IP    
          valueFrom:          
            fieldRef:          
              fieldPath: status.podIP
        - 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

  • 检查网络是否连通（主节点）

    # 检查pod是否都是ready状态
kubectl get pods -o wide --all-namespaces
...

# 手动创建一个pod
kubectl create deployment nginx --image=nginx

# 查看pod的ip
kubectl get pods -o wide

# 主节点或其它节点，ping一下此ip,看看是否能ping通

​ 。。。。不出意外，就是这样了

posted @ 2020-10-11 11:50  ament  阅读(624)  评论(0)  编辑  收藏  举报