# 使用 Kubeadm 部署(单master)
# 预先准备
环境：
| 角色 | IP |
|---|---|
| master | 172.16.1.129 |
| node01 | 172.16.1.133 |
修改当前的主机名，确保不是 localhost：
hostnamectl set-hostname master
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为各节点添加主机名解析， 编辑/etc/hosts：
...
172.16.1 master master.agou-ops.com
172.16.1 node01 node01.aogu-ops.com
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确保任意节点上
Kubelet使用的 IP 地址可互通（无需 NAT 映射即可相互访问），且没有防火墙、安全组隔离
关闭防火墙和SElinux：
sed -i 's/SELINUX=*/SELINUX=disabled/' /etc/selinux/config
# getenforce 确定当前SElinux状态
systemctl disable firewalld && systemctl stop firewalld
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安装 docker 以及 kubelet ：
# --------- 在 master 和 node 节点执行 -----------
# 使用阿里云 docker 镜像加速，可以自行去控制台申请，在这里我使用公共加速镜像
export REGISTRY_MIRROR=https://registry.cn-hangzhou.aliyuncs.com
# 编辑脚本快速安装，内容如下：
#!/bin/bash
# 在 master 节点和 worker 节点都要执行
# 安装 docker
# 参考文档如下
# https://docs.docker.com/install/linux/docker-ce/centos/
# https://docs.docker.com/install/linux/linux-postinstall/
# 卸载旧版本
yum remove -y docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-selinux \
docker-engine-selinux \
docker-engine
# 设置 yum repository
yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# 安装并启动 docker
yum install -y docker-ce-19.03.8 docker-ce-cli-19.03.8 containerd.io
systemctl enable docker
systemctl start docker
# 安装 nfs-utils
# 必须先安装 nfs-utils 才能挂载 nfs 网络存储
yum install -y nfs-utils
yum install -y wget
# 关闭 swap ××重要××
swapoff -a && echo "vm.swappiness=0" >> /etc/sysctl.conf && sysctl -p && free –h
# 修改 /etc/sysctl.conf
# 如果有配置，则修改
sed -i "s#^net.ipv4.ip_forward.*#net.ipv4.ip_forward=1#g" /etc/sysctl.conf
sed -i "s#^net.bridge.bridge-nf-call-ip6tables.*#net.bridge.bridge-nf-call-ip6tables=1#g" /etc/sysctl.conf
sed -i "s#^net.bridge.bridge-nf-call-iptables.*#net.bridge.bridge-nf-call-iptables=1#g" /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.all.disable_ipv6.*#net.ipv6.conf.all.disable_ipv6=1#g" /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.default.disable_ipv6.*#net.ipv6.conf.default.disable_ipv6=1#g" /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.lo.disable_ipv6.*#net.ipv6.conf.lo.disable_ipv6=1#g" /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.all.forwarding.*#net.ipv6.conf.all.forwarding=1#g" /etc/sysctl.conf
# 可能没有，追加
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.forwarding = 1" >> /etc/sysctl.conf
# 执行命令以应用
sysctl -p
# 配置K8S的yum源
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
EOF
# 卸载旧版本
yum remove -y kubelet kubeadm kubectl
# 安装kubelet、kubeadm、kubectl
# 将 ${1} 替换为 kubernetes 版本号，例如 1.17.2
yum install -y kubelet-${1} kubeadm-${1} kubectl-${1}
# 修改docker Cgroup Driver为systemd
# # 将/usr/lib/systemd/system/docker.service文件中的这一行 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
# # 修改为 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd
# 如果不修改，在添加 worker 节点时可能会碰到如下错误
# [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd".
# Please follow the guide at https://kubernetes.io/docs/setup/cri/
sed -i "s#^ExecStart=/usr/bin/dockerd.*#ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd#g" /usr/lib/systemd/system/docker.service
# 设置 docker 镜像，提高 docker 镜像下载速度和稳定性
# 如果您访问 https://hub.docker.io 速度非常稳定，亦可以跳过这个步骤
curl -sSL https://kuboard.cn/install-script/set_mirror.sh | sh -s ${REGISTRY_MIRROR}
# 重启 docker，并启动 kubelet
systemctl daemon-reload
systemctl restart docker
systemctl enable kubelet && systemctl start kubelet
docker version
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⚠️ WARNING
如果此时执行
service status kubelet命令，将得到 kubelet 启动失败的错误提示，请忽略此错误，因为必须完成后续步骤中kubeadm init的操作，kubelet 才能正常启动
赋予权限及运行：
chmod +x preinstall.sh
./preinstall.sh 1.18.2
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# 初始化 master 节点
关于初始化时用到的环境变量
APISERVER_NAME不能是 master 的 hostnameAPISERVER_NAME必须全为小写字母、数字、小数点，不能包含减号POD_SUBNET所使用的网段不能与 master节点/worker节点 所在的网段重叠。该字段的取值为一个 CIDR (opens new window) 值，如果您对 CIDR 这个概念还不熟悉，请仍然执行export POD_SUBNET=10.100.0.1/16命令，不做修改
在 master 节点上运行：
# 替换 x.x.x.x 为 master 节点的内网IP
# export 命令只在当前 shell 会话中有效，开启新的 shell 窗口后，如果要继续安装过程，请重新执行此处的 export 命令
export MASTER_IP=172.16.1.129
# 替换 apiserver.demo 为 您想要的 dnsName
export APISERVER_NAME=apiserver.agou.com
# Kubernetes 容器组所在的网段，该网段安装完成后，由 kubernetes 创建，事先并不存在于您的物理网络中
export POD_SUBNET=10.100.0.1/16
echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts
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在master节点上添加以下脚本：
#!/bin/bash
# 只在 master 节点执行
# 脚本出错时终止执行
set -e
if [ ${#POD_SUBNET} -eq 0 ] || [ ${#APISERVER_NAME} -eq 0 ]; then
echo -e "\033[31;1m请确保您已经设置了环境变量 POD_SUBNET 和 APISERVER_NAME \033[0m"
echo 当前POD_SUBNET=$POD_SUBNET
echo 当前APISERVER_NAME=$APISERVER_NAME
exit 1
fi
# 查看完整配置选项 https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2
rm -f ./kubeadm-config.yaml
cat <<EOF > ./kubeadm-config.yaml
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v${1}
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
controlPlaneEndpoint: "${APISERVER_NAME}:6443"
networking:
serviceSubnet: "10.96.0.0/16"
podSubnet: "${POD_SUBNET}"
dnsDomain: "cluster.local"
EOF
# kubeadm init
# 根据您服务器网速的情况，您需要等候 3 - 10 分钟
kubeadm init --config=kubeadm-config.yaml --upload-certs
# 配置 kubectl
rm -rf /root/.kube/
mkdir /root/.kube/
cp -i /etc/kubernetes/admin.conf /root/.kube/config
# 安装 calico 网络插件
# 参考文档 https://docs.projectcalico.org/v3.13/getting-started/kubernetes/self-managed-onprem/onpremises
echo "安装calico-3.13.1"
rm -f calico-3.13.1.yaml
wget https://kuboard.cn/install-script/calico/calico-3.13.1.yaml
kubectl apply -f calico-3.13.1.yaml
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执行该脚本：
bash master_init.sh 1.18.2
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检查master初始化结果：
# 执行如下命令，等待 3-10 分钟，直到所有的容器组处于 Running 状态
watch kubectl get pod -n kube-system -o wide
# 查看 master 节点初始化结果
kubectl get nodes -o wide
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# 初始化 node 节点
# 获得 join命令参数
在master 节点上获取join命令行：
kubeadm token create --print-join-command
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ℹ️ 有效时间
该
token的有效时间为 2 个小时，2小时内，您可以使用此 token 初始化任意数量的 worker 节点。
# 初始化 node 节点
编辑本地主机解析文件/etc/hosts：
# 添加以下内容
172.16.1.129 apiserver.agou.com
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执行从master节点上获取的join命令：
kubeadm join apiserver.agou.com:6443 --token 7t8xh1.2y6pzjpgl9eai0kd --discovery-token-ca-cert-hash sha256:a57479ae585f0c0a617d890c62c15c71023d85d4d55f4dd8fffeb56d9a467ef7
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# 检查初始化结果
在master节点上执行：
kubectl get nodes -o wide
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# 安装 Ingress Controller
编辑初始化文件nginx-ingress.yaml，内容如下：
# 如果打算用于生产环境，请参考 https://github.com/nginxinc/kubernetes-ingress/blob/v1.5.5/docs/installation.md 并根据您自己的情况做进一步定制
apiVersion: v1
kind: Namespace
metadata:
name: nginx-ingress
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: nginx-ingress
namespace: nginx-ingress
---
apiVersion: v1
kind: Secret
metadata:
name: default-server-secret
namespace: nginx-ingress
type: Opaque
data:
tls.crt: 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
tls.key: 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
---
kind: ConfigMap
apiVersion: v1
metadata:
name: nginx-config
namespace: nginx-ingress
data:
server-names-hash-bucket-size: "1024"
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: nginx-ingress
rules:
- apiGroups:
- ""
resources:
- services
- endpoints
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- secrets
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- configmaps
verbs:
- get
- list
- watch
- update
- create
- apiGroups:
- ""
resources:
- pods
verbs:
- list
- apiGroups:
- ""
resources:
- events
verbs:
- create
- patch
- apiGroups:
- extensions
resources:
- ingresses
verbs:
- list
- watch
- get
- apiGroups:
- "extensions"
resources:
- ingresses/status
verbs:
- update
- apiGroups:
- k8s.nginx.org
resources:
- virtualservers
- virtualserverroutes
verbs:
- list
- watch
- get
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: nginx-ingress
subjects:
- kind: ServiceAccount
name: nginx-ingress
namespace: nginx-ingress
roleRef:
kind: ClusterRole
name: nginx-ingress
apiGroup: rbac.authorization.k8s.io
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: nginx-ingress
namespace: nginx-ingress
annotations:
prometheus.io/scrape: "true"
prometheus.io/port: "9113"
spec:
selector:
matchLabels:
app: nginx-ingress
template:
metadata:
labels:
app: nginx-ingress
spec:
serviceAccountName: nginx-ingress
containers:
- image: nginx/nginx-ingress:1.5.5
name: nginx-ingress
ports:
- name: http
containerPort: 80
hostPort: 80
- name: https
containerPort: 443
hostPort: 443
- name: prometheus
containerPort: 9113
env:
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
args:
- -nginx-configmaps=$(POD_NAMESPACE)/nginx-config
- -default-server-tls-secret=$(POD_NAMESPACE)/default-server-secret
#- -v=3 # Enables extensive logging. Useful for troubleshooting.
#- -report-ingress-status
#- -external-service=nginx-ingress
#- -enable-leader-election
- -enable-prometheus-metrics
#- -enable-custom-resources
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执行初始化：
kubectl apply -f nginx-ingress.yaml
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参考自：https://kuboard.cn/ 仅稍作修改。
# 参考链接
- kuboard documetation： https://kuboard.cn/install/install-k8s.html
- image-pull-backoff解决方案：https://kuboard.cn/learning/faq/image-pull-backoff.html