ansible一键部署k8s单机环境

一、虚拟机准备

干净的Centsot7.4、4G内存、2个CPU

最小化安装，最好带虚拟化

二、执行初始化脚本

注意：脚本中配置静态网卡根据实际网卡名称配置，我用的是ens33

可以用 sed -i "s/ens33/（实际网卡名)/g" 文件路径 进行替换

#!/bin/bash
echo "正在执行安装k8s环境初始化..."
#关闭防火墙
/usr/bin/iptables -F >/dev/null 2>&1
/usr/bin/iptables -X >/dev/null 2>&1
/usr/bin/systemctl disable firewalld.service >/dev/null 2>&1
/usr/bin/systemctl stop firewalld.service >/dev/null 2>&1
echo "执行关闭防火墙..."

#禁用SELINUX
/usr/sbin/setenforce 0
/usr/bin/sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config
echo "执行关闭selinux..."

#关闭swap
/usr/sbin/swapoff -a
echo "vm.swappiness = 0">> /etc/sysctl.conf
echo "执行关闭swap..."

#配置静态网络
echo "配置静态网络..."
cat << EOF >/etc/sysconfig/network-scripts/ifcfg-ens33
TYPE="Ethernet"
BOOTPROTO="static"
IPADDR="`ifconfig ens33 | grep broadcast | awk -F " " '{print $2}'`"
NETMASK="`ifconfig ens33 | grep broadcast | awk -F " " '{print $4}'`"
GATREWAY="`route -n | grep UG | awk -F " " '{print$2}'`"
NAME="ens33"
DEVICE="ens33"
ONBOOT="yes"
PEERDNS="yes"
DNS1="114.114.114.114"
DNS2="8.8.8.8"
DNS3="`route -n | grep UG | awk -F " " '{print$2}'`"
EOF

cat <<EOF >/etc/sysconfig/network
GATEWAY=`route -n | grep UG | awk -F " " '{print$2}'`
EOF

#配置yum源
cat << EOF >/etc/yum.repos.d/163.repo
[163]
name=163
baseurl=http://mirrors.163.com/centos/7/os/x86_64/
gpgcheck=0
enable=1
EOF

cat << EOF >/etc/yum.repos.d/epel.repo
[epel]
name=epel
baseurl=https://mirrors.aliyun.com/epel/7/x86_64/
enabled=1
gpgcheck=0
EOF
echo "写入网络yum源..."

#更新yum源
yum clean all >/dev/null 2>&1
yum makecache >/dev/null 2>&1
echo "更新yum源..."

#安装wget、ansible
yum install -y wget >/dev/null 2>&1
yum install -y ansible >/dev/null 2>&1
echo "安装wget、ansible工具..."

#定义ansible组
cat << EOF >>/etc/ansible/hosts
[k8s]
`ifconfig ens33 | grep broadcast | awk -F " " '{print $2}'`
EOF
echo "配置ansible组..."

#设置主机名
echo -n "请输入主机名："
read -p "" name
/usr/bin/hostnamectl --static set-hostname $name
if [ $? = 0 ]
then
   echo "修改主机名成功..."
else
   echo "修改主机名失败..."
   exit
fi
 
echo "初始化完成..."
echo "正在执行重启操作..."
sleep 3
/usr/sbin/init 6

三、执行ssh进行主机验证

ssh root@本机ip

若不执行，ansible执行会报错

四、ansible部署k8s环境准备

注意：shell脚本我统一放在/root/start-sh/目录下

mkdir -p /root/start-sh/

扫描二维码关注公众号，回复： 5859404 查看本文章

cd /root/start-sh/

vim docker-k8s.sh

创建docker-k8s.sh脚本，其内容是拉取k8s镜像

#!/bin/bash
#下载镜像
docker pull mirrorgooglecontainers/kube-apiserver:v1.14.0
docker pull mirrorgooglecontainers/kube-controller-manager:v1.14.0
docker pull mirrorgooglecontainers/kube-scheduler:v1.14.0
docker pull mirrorgooglecontainers/kube-proxy:v1.14.0
docker pull mirrorgooglecontainers/pause:3.1
docker pull mirrorgooglecontainers/etcd:3.3.10
docker pull coredns/coredns:1.3.1
docker pull registry.cn-shenzhen.aliyuncs.com/cp_m/flannel:v0.10.0-amd64
#给镜像打tag
docker tag mirrorgooglecontainers/kube-apiserver:v1.14.0 k8s.gcr.io/kube-apiserver:v1.14.0
docker tag mirrorgooglecontainers/kube-controller-manager:v1.14.0 k8s.gcr.io/kube-controller-manager:v1.14.0
docker tag mirrorgooglecontainers/kube-scheduler:v1.14.0 k8s.gcr.io/kube-scheduler:v1.14.0
docker tag mirrorgooglecontainers/kube-proxy:v1.14.0 k8s.gcr.io/kube-proxy:v1.14.0
docker tag mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
docker tag mirrorgooglecontainers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
docker tag coredns/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1
docker tag registry.cn-shenzhen.aliyuncs.com/cp_m/flannel:v0.10.0-amd64 quay.io/coreos/flannel:v0.10.0-amd64
#删除原镜像
docker rmi mirrorgooglecontainers/kube-apiserver:v1.14.0           
docker rmi mirrorgooglecontainers/kube-controller-manager:v1.14.0  
docker rmi mirrorgooglecontainers/kube-scheduler:v1.14.0           
docker rmi mirrorgooglecontainers/kube-proxy:v1.14.0               
docker rmi mirrorgooglecontainers/pause:3.1                        
docker rmi mirrorgooglecontainers/etcd:3.3.10                      
docker rmi coredns/coredns:1.3.1
docker rmi registry.cn-shenzhen.aliyuncs.com/cp_m/flannel:v0.10.0-amd64

创建k8s目录，编写kube-flannel.yaml文件（参照https://www.codesheep.cn/kube-flannel-yml/?spm=a2c4e.11153940.blogcont682810.11.6f853974iYJ4BU）

该内容目的是pod的网络通信

mkdir -p /root/kube-system/

cd /root/kube-system/

vim kube-flannel.yaml

---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: flannel
rules:
  - 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",
      "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: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-amd64
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      hostNetwork: true
      nodeSelector:
        beta.kubernetes.io/arch: amd64
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.10.0-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:v0.10.0-amd64
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: true
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-arm64
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      hostNetwork: true
      nodeSelector:
        beta.kubernetes.io/arch: arm64
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.10.0-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:v0.10.0-arm64
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: true
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-arm
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      hostNetwork: true
      nodeSelector:
        beta.kubernetes.io/arch: arm
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.10.0-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:v0.10.0-arm
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: true
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-ppc64le
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      hostNetwork: true
      nodeSelector:
        beta.kubernetes.io/arch: ppc64le
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.10.0-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:v0.10.0-ppc64le
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: true
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-s390x
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      hostNetwork: true
      nodeSelector:
        beta.kubernetes.io/arch: s390x
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.10.0-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:v0.10.0-s390x
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: true
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg

yaml文件建好后使用一个脚本启动它

cd /root/start-sh/

vim start-pod-network

#!/bin/bash
#设置kubectl
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> /etc/profile
source /etc/profile
#安装pod network
/usr/sbin/sysctl net.bridge.bridge-nf-call-iptables=1
kubectl apply -f /root/k8s/kube-system/kube-flannel.yaml

准备好k8s需要的环境文件后编写ansible剧本

mkdir -p /root/asnible

cd /root/ansible

vim k8s.yml

注意：init k8s我使用了一个awk获取本地ip也是根据ens33网卡

---
- hosts: k8s
  remote_user: root
  tasks:
  - name: off iptables
    shell: iptables -F && iptables -X
  - name: wget CentOS-Base.repo
    shell: wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  - name: update CentOS-Base.repo
    shell: sed -i "s/[$]releasever/7/g" /etc/yum.repos.d/CentOS-Base.repo
  - name: k8s.repo
    shell: echo -e [kubernetes]"\n"name=Kubernetes Repo"\n"baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/"\n"gpgcheck=0"\n"gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg >/etc/yum.repos.d/k8s.repo
  - name: wget docker-ce.repo
    shell: wget http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker.repo
  - name: yum makecache
    shell: yum clean all && yum makecache
  - name: install epel-release
    yum: name=epel-release state=present
  - name: install container-selinux
    yum: name=container-selinux state=present
  - name: install docker
    yum: name=docker state=present
  - name: update docker-selinux
    shell: sed -i "s/OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'/OPTIONS='--log-driver=journald --signature-verification=false'/g" /etc/sysconfig/docker
  - name: start docker
    service: name=docker enabled=yes state=restarted
  - name: install kubelet
    yum: name=kubelet state=present
  - name: install kubeadm
    yum: name=kubeadm state=present 
  - name: install kubectl
    yum: name=kubectl state=present
  - name: start kubelet
    service: name=kubelet enabled=yes state=restarted
  - name: pull k8s iso
    shell: bash /root/start-sh/docker-k8s.sh
  - name: off swap
    shell: swapoff -a
  - name: init k8s
    ignore_errors: yes
    shell: kubeadm init --kubernetes-version=v1.14.0 --apiserver-advertise-address `ifconfig ens33 | grep broadcast | awk -F " " '{print $2}'`  --pod-network-cidr=10.244.0.0/16
  - name: install pod network
    script: /root/start-sh/start-pod-network.sh
  - name: source kubcetl
    shell: source /etc/profile

五、执行ansible一键部署

cd /root/ansible/

ansible-playbook k8s.yml --ask-pass

输入密码

开始执行中，过程会有些慢，因为需拉取镜像

六、验证pod是否正常

完成后执行 kubectl get pod -n kube-system查看pod状态

若输入命令无效，再执行一次source /etc/profile

k8s环境部署好了

------------------------------------------------------------------------------------------------------------------------------------

技术不足望多见谅，若ansible有更好的优化方式可以留言交流

谢谢，祝工作顺利，身体健康