centos7安装k8s-v1.18
文章目录
系统准备
查看系统版本
[root@test-1]# cat /etc/centos-release
CentOS Linux release 7.8.2003 (Core)
配置网络 /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=ens33
UUID=63317378-0754-43ca-a0bd-9f3540024853
DEVICE=ens33
ONBOOT=yes
BOOTPROTO=none
IPADDR=192.168.23.200
NETMASK=255.255.255.0
GATEWAY=192.168.23.2
DNS1=114.114.114.114
ZONE=public
添加阿里源
rm -rfv /etc/yum.repos.d/*
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
配置主机名/etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.23.200 test-1
192.168.23.201 test-2
192.168.23.202 test-3
关闭swap
swapoff -a
注释swap分区/etc/fstab
/dev/mapper/centos-root / xfs defaults 0 0
UUID=8d8fc854-3a82-410e-9984-2f6d30336959 /boot xfs defaults 0 0
#/dev/mapper/centos-swap swap swap defaults 0 0
配置内核参数，将桥接的IPv4流量传递到iptables的链
[root@test-1 ~]# cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
安装常用包
yum install vim bash-completion net-tools gcc -y
使用aliyun源安装docker-ce
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum -y install docker-ce
安装docker-ce如果出现以下错
[root@master01 ~]# yum -y install docker-ce
CentOS-8 - Base - mirrors.aliyun.com 14 kB/s | 3.8 kB 00:00
CentOS-8 - Extras - mirrors.aliyun.com 6.4 kB/s | 1.5 kB 00:00
CentOS-8 - AppStream - mirrors.aliyun.com 16 kB/s | 4.3 kB 00:00
Docker CE Stable - x86_64 40 kB/s | 22 kB 00:00
Error:
Problem: package docker-ce-3:19.03.8-3.el7.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed
- cannot install the best candidate for the job
- package containerd.io-1.2.10-3.2.el7.x86_64 is excluded
- package containerd.io-1.2.13-3.1.el7.x86_64 is excluded
- package containerd.io-1.2.2-3.3.el7.x86_64 is excluded
- package containerd.io-1.2.2-3.el7.x86_64 is excluded
- package containerd.io-1.2.4-3.1.el7.x86_64 is excluded
- package containerd.io-1.2.5-3.1.el7.x86_64 is excluded
- package containerd.io-1.2.6-3.3.el7.x86_64 is excluded
(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
解决方法
wget https://download.docker.com/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
yum install containerd.io-1.2.6-3.3.el7.x86_64.rpm
然后再安装docker-ce即可成功
添加aliyundocker仓库加速器
mkdir -p /etc/docker
tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://fl791z1h.mirror.aliyuncs.com"]
}
EOF
systemctl daemon-reload
systemctl restart docker
安装kubectl、kubelet、kubeadm
添加阿里kubernetes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
安装
yum -y install kubectl kubelet kubeadm
systemctl enable kubelet
初始化k8s集群
master执行
kubeadm init --kubernetes-version=1.18.0 \
--apiserver-advertise-address=192.168.23.200 \
--image-repository registry.aliyuncs.com/google_containers \
--service-cidr=10.10.0.0/16 --pod-network-cidr=10.122.0.0/16
POD的网段为: 10.122.0.0/16， api server地址就是master本机IP。这一步很关键，由于kubeadm 默认从官网k8s.grc.io下载所需镜像，国内无法访问，因此需要通过–image-repository指定阿里云镜像仓库地址。
集群初始化成功后返回如下信息：
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.23.200:6443 --token lvr1m8.agdwfvygxmb3sbw0 \
--discovery-token-ca-cert-hash sha256:3a51ad14064fe7661e5ff45eba2222b29c3a541c025cfa911678981ac6bd1dd2
记录生成的最后部分内容，此内容需要在其它节点加入Kubernetes集群时执行。
根据提示创建kubectl
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
执行下面命令，使kubectl可以自动补充
source <(kubectl completion bash)
查看节点，pod
[root@test-1 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
test-1 Ready master 3h7m v1.18.2
[root@master01 ~]# kubectl get pod --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-7ff77c879f-fsj9l 0/1 Pending 0 2m12s
kube-system coredns-7ff77c879f-q5ll2 0/1 Pending 0 2m12s
kube-system etcd-master01.paas.com 1/1 Running 0 2m22s
kube-system kube-apiserver-master01.paas.com 1/1 Running 0 2m22s
kube-system kube-controller-manager-master01.paas.com 1/1 Running 0 2m22s
kube-system kube-proxy-th472 1/1 Running 0 2m12s
kube-system kube-scheduler-master01.paas.com 1/1 Running 0 2m22s
[root@master01 ~]#
node节点为NotReady，因为corednspod没有启动，缺少网络pod
#拷贝 master机器上 $HOME/.kube/config 到node节点上
#不然执行kubectl 会报错 error: no configuration has been provided, try setting KUBERNETES_MASTER environment variable
ssh test-1 'mkdir ~/.kube'
ssh test-2 'mkdir ~/.kube'
scp $HOME/.kube/config root@test-1:~/.kube
scp $HOME/.kube/config root@test-2:~/.kube
安装calico网络
所有节点执行
kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
node节点配置
kubeadm join 192.168.23.200:6443 --token lvr1m8.agdwfvygxmb3sbw0 \
--discovery-token-ca-cert-hash sha256:3a51ad14064fe7661e5ff45eba2222b29c3a541c025cfa911678981ac6bd1dd2
查看集群状态
[root@test-1 ~]#kubectl get node
NAME STATUS ROLES AGE VERSION
test-1 Ready master 3h7m v1.18.2
test-2 Ready <none> 3h v1.18.2
test-3 Ready <none> 3h v1.18.2
安装kubernetes-dashboard
官方部署dashboard的服务没使用nodeport，将yaml文件下载到本地，在service里添加nodeport
wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0/aio/deploy/recommended.yaml
修改recommended.yaml
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
type: NodePort # 新增
ports:
- port: 443
targetPort: 8443
nodePort: 30000 # 新增
selector:
k8s-app: kubernetes-dashboard
创建
kubectl create -f recommended.yaml
查看安装结果
[root@test-1 ~]#kubectl get pods -A -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-kube-controllers-789f6df884-b7td2 1/1 Running 0 165m 10.122.139.194 test-3 <none> <none>
kube-system calico-node-8c2b2 1/1 Running 0 165m 192.168.23.202 test-3 <none> <none>
kube-system calico-node-g8cmj 1/1 Running 0 165m 192.168.23.201 test-2 <none> <none>
kube-system calico-node-t7ghm 1/1 Running 0 165m 192.168.23.200 test-1 <none> <none>
kube-system coredns-7ff77c879f-8hfrq 1/1 Running 0 173m 10.122.17.1 test-2 <none> <none>
kube-system coredns-7ff77c879f-jzgx8 1/1 Running 0 173m 10.122.139.193 test-3 <none> <none>
kube-system etcd-test-1 1/1 Running 0 173m 192.168.23.200 test-1 <none> <none>
kube-system kube-apiserver-test-1 1/1 Running 0 173m 192.168.23.200 test-1 <none> <none>
kube-system kube-controller-manager-test-1 1/1 Running 0 173m 192.168.23.200 test-1 <none> <none>
kube-system kube-proxy-5j9td 1/1 Running 0 167m 192.168.23.202 test-3 <none> <none>
kube-system kube-proxy-hqfzq 1/1 Running 0 173m 192.168.23.200 test-1 <none> <none>
kube-system kube-proxy-w6wzt 1/1 Running 0 167m 192.168.23.201 test-2 <none> <none>
kube-system kube-scheduler-test-1 1/1 Running 0 173m 192.168.23.200 test-1 <none> <none>
kubernetes-dashboard dashboard-metrics-scraper-6b4884c9d5-q2m4p 1/1 Running 0 23m 10.122.139.195 test-3 <none> <none>
kubernetes-dashboard kubernetes-dashboard-7b544877d5-rdz4p 1/1 Running 0 23m 10.122.17.2 test-2 <none> <none>
[root@test-1 ~]#kubectl get service -n kubernetes-dashboard -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
dashboard-metrics-scraper ClusterIP 10.10.47.66 <none> 8000/TCP 23m k8s-app=dashboard-metrics-scraper
kubernetes-dashboard NodePort 10.10.57.249 <none> 443:30000/TCP 23m k8s-app=kubernetes-dashboard
创建dashboard管理员
创建dashboard-admin.yaml文件
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
k8s-app: kubernetes-dashboard
name: dashboard-admin
namespace: kubernetes-dashboard
kubectl create -f ./dashboard-admin.yaml
为用户分配权限
创建dashboard-admin-bind-cluster-role.yaml文件。
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: dashboard-admin-bind-cluster-role
labels:
k8s-app: kubernetes-dashboard
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: dashboard-admin
namespace: kubernetes-dashboard
kubectl create -f ./dashboard-admin-bind-cluster-role.yaml
查看并复制用户Token
在命令行执行如下命令。
kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep dashboard-admin | awk '{print $1}')
可以看到，此时的Token值为：
eyJhbGciOiJSUzI1NiIsImtpZCI6Im9CdXlmODBpbUtGLUJLd3k1OEczcXVObjRyendoR2xHcHBJdDJDdm1jdzQifQ.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.BMFDfjacZtdp8R_htqade_hQMArdOxz_WFga-0GjV0LCa4LQOdOCPLQ--P0bEW1Wz1dAsvYhu2tLuqmoU3792d5RJOtLWSxkO5KGMSy2w-QfM-fikKtRzUrP7ttYqwNr_uNUaL3ONe9xwtTPIKaunC8ub5QwYuxqxUSClZ9UVkWfR-fZ-xkE40iFWeFkCaQcByJAQ3087z9dqg8Ps7QryDnCyeMgbVhPr3U5eL3ZoYHbfT9t74YqdyRSo8q0n-RxOxFHA_wmx11_DTzTP4o0tAb8wNgNaTCM-G3JqoG-7gXfK9DBX8ApqLlb-f1iIYmvy8o1ehFldBaJZFxb_ixV_w
查看dashboard界面
在浏览器中打开链接 https://192.168.23.200:30000 ，如下所示。
这里，我们选择Token方式登录，并输入在命令行获取到的Token
点击登录后进入dashboard，如下所示。
至此k8s-V1.18安装完成