kubeadm部署Kubernetes 1.15
資源準(zhǔn)備
| 節(jié)點(diǎn)角色 | 系統(tǒng)版本 | CPU | 內(nèi)存 | ip地址 |
|---|---|---|---|---|
| master | Centos7.6/64位 | >=2C | >=2G | 192.168.105.10 |
| node1 | Centos7.6/64位 | >=2C | >=2G | 192.168.105.11 |
| node2 | Centos7.6/64位 | >=2C | >=2G | 192.168.105.12 |
| node3 | Centos7.6/64位 | >=2C | >=2G | 192.168.105.13 |
環(huán)境準(zhǔn)備
注意：在所有節(jié)點(diǎn)進(jìn)行如下操作
- 設(shè)置hostname，node節(jié)點(diǎn)對(duì)應(yīng)設(shè)置即可
hostnamectl set-hostname master
- 編輯 /etc/hosts 文件，添加域名解析。
cat <<EOF >>/etc/hosts
192.168.105.10 master
192.168.105.11 node1
192.168.105.12 node2
192.168.105.13 node3
EOF
- 關(guān)閉防火墻、selinux、swap。
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab
- 配置內(nèi)核參數(shù)，將橋接的IPv4流量傳遞到iptables的鏈
cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf
sysctl -p
- 配置國內(nèi)yum源
yum install -y wget
mkdir /etc/yum.repos.d/bak && mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.cloud.tencent.com/repo/epel-7.repo
yum clean all && yum makecache
- 配置國內(nèi)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
- 配置 docker 源
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
軟件安裝
注意：在所有節(jié)點(diǎn)操作
- 安裝docker
- docker服務(wù)為容器運(yùn)行提供計(jì)算資源，是所有容器運(yùn)行的基本平臺(tái)。
yum install -y docker-ce-18.06.1.ce-3.el7
systemctl enable docker && systemctl start docker
docker version
- 安裝kubeadm、kubelet、kubectl
- Kubelet負(fù)責(zé)與其他節(jié)點(diǎn)集群通信，并進(jìn)行本節(jié)點(diǎn)Pod和容器生命周期的管理。Kubeadm是Kubernetes的自動(dòng)化部署工具，降低了部署難度，提高效率。Kubectl是Kubernetes集群管理工具。
yum install -y kubelet-1.15.0 kubeadm-1.15.0 kubectl-1.15.0
systemctl enable kubelet
部署Master節(jié)點(diǎn)服務(wù)
注意：僅僅在master節(jié)點(diǎn)操作
- 在master進(jìn)行Kubernetes集群初始化。
kubeadm init --kubernetes-version=1.15.0 \
--apiserver-advertise-address=192.168.105.10 \
--image-repository registry.aliyuncs.com/google_containers \
--service-cidr=10.233.0.0/16 \
--pod-network-cidr=10.244.0.0/16 \
--ignore-preflight-errors=all \
--token-ttl=0
定義POD的網(wǎng)段為: 10.244.0.0/16， api server地址就是master本機(jī)IP地址。
這一步很關(guān)鍵，由于kubeadm 默認(rèn)從官網(wǎng)k8s.grc.io下載所需鏡像，國內(nèi)無法訪問，因此需要通過–image-repository指定阿里云鏡像倉庫地址，很多新手初次部署都卡在此環(huán)節(jié)無法進(jìn)行后續(xù)配置。
集群初始化成功后返回如下信息：
記錄生成的最后部分內(nèi)容，此內(nèi)容需要在其它節(jié)點(diǎn)加入Kubernetes集群時(shí)執(zhí)行。
kubeadm join 192.168.105.10:6443 --token ds40sk.3fmv5gr0g1a3j3ui \
--discovery-token-ca-cert-hash sha256:056eaec84864754de11d50e1b600d378c209b1c5ec786d3b774b241f01577b52
- 配置kubectl工具
mkdir -p /root/.kube
cp /etc/kubernetes/admin.conf /root/.kube/config
kubectl get nodes
部署flannel網(wǎng)絡(luò)
注意：在所有節(jié)點(diǎn)操作
docker pull quay.io/coreos/flannel:v0.9.1-amd64
mkdir -p /etc/cni/net.d/
cat <<EOF> /etc/cni/net.d/10-flannel.conf
{"name":"cbr0","type":"flannel","delegate": {"isDefaultGateway": true}}
EOF
mkdir /usr/share/oci-umount/oci-umount.d -p
mkdir /run/flannel/
cat <<EOF> /run/flannel/subnet.env
FLANNEL_NETWORK=10.244.0.0/16
FLANNEL_SUBNET=10.244.0.1/24
FLANNEL_MTU=1450
FLANNEL_IPMASQ=true
EOF
注意：在master節(jié)點(diǎn)啟動(dòng)
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml
部署Dashboard
注意：在master節(jié)點(diǎn)操作
- 修改鏡像地址
wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml
sed -i 's@k8s.gcr.io@registry.cn-hangzhou.aliyuncs.com/google_containers@g' kubernetes-dashboard.yaml
k8s.gcr.io 修改為 registry.cn-hangzhou.aliyuncs.com/google_containers，后續(xù)所有 yaml 文件中，只要涉及到 image 的，都需要做同樣的修改，因?yàn)閲鴥?nèi) k8s.gcr.io 這個(gè)地址被墻了。
- 修改對(duì)外暴露的端口
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
ports:
- port: 443
targetPort: 8443
selector:
k8s-app: kubernetes-dashboard
- 修改為
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
ports:
- port: 443
targetPort: 8443
nodePort: 30000
selector:
k8s-app: kubernetes-dashboard
type: NodePort
- 創(chuàng)建登錄令牌
kubectl create serviceaccount dashboard-admin -n kube-system
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
- 獲取toten對(duì)應(yīng)的值：
eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.d3kHjYm1yYw1wEnFoIepMSm9VXdkxmFImxx6I6znk4cMRxPN_6kb-omJT4-8Xpsd5zbiLmT5pfbqs6qPuRgtjasyoo1bLhYdup7v9Q3_0XeFCQ9NVhTUC70VEielm2GRbPmew2Cr-Wou2QRvyqmVIy3OUpDIA5Ag8wKM-Wbiu9j14qsJomZ4EacwEiImw5qREMQVFzhtX8FDPvX7JqCVvJ2aqTQQrGV9bWAu88BoLGA3kD9YSUgZ3OdzfFEjRsSMQg4s_ZfZE2qGv_aKHxuZb9-EJX-GVai0CnX7GAwpSIG1sT_d99PnxxZE9g4C8gE2VJjr9fAUYOJc3qJemGhbWQ
- 查看Dashboard的pod運(yùn)行再哪個(gè)node上
# master節(jié)點(diǎn)
[root@master yaml]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
......
kube-system kubernetes-dashboard-86844cc55f-fgvnj 1/1 Running 0 8m33s
......
[root@master yaml]# kubectl describe pod kubernetes-dashboard-86844cc55f-fgvnj -n kube-system
......
Node: node1/192.168.105.11
......
- 打開地址：https://192.168.105.11:30000
- 選擇令牌輸入上面的toten，如下即可
m_3017662075561b62f099605da455e13f_r.png
