一、环境准备 本环境是由单独的etcd集群(3节点)及双master双node节点: 1、k8s环境 #主机名ip192.168.1.31 km01192.168.1.32 km02192.168.1.81 node01192.168.1.82 node02#目录/opt/kubernetes/ssl,cfg,logs,bin 2、etcd环境
一、环境准备
本环境是由单独的etcd集群(3节点)及双master双node节点:
1、k8s环境
#主机名ip 192.168.1.31 km01 192.168.1.32 km02 192.168.1.81 node01 192.168.1.82 node02 #目录 /opt/kubernetes/ssl,cfg,logs,bin2、etcd环境
1> etcd集群信息
# 主机名，ip 192.168.1.61 etcd-01 192.168.1.62 etcd-02 192.168.1.63 etcd-03 # 目录 /opt/etcd/cfg,ssl2> etcd集群搭建
https://blog.51cto.com/keep11/36512903> etcd目录```html/xml[root@k01 ~]# cd /opt/etcd/[root@k01 etcd]# tree ././├── bin│ ├── cfssl│ └── cfssljson├── cfg│ └── etcd.conf└── ssl├── ca-key.pem├── ca.pem├── server-key.pem└── server.pem
4> etcd集群状态 ```html/xml [root@k01 ~]# etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.1.61:2379,https://192.168.1.62:2379,https://192.168.1.63:2379" endpoint health https://192.168.1.62:2379 is healthy: successfully committed proposal: took = 95.324662ms https://192.168.1.61:2379 is healthy: successfully committed proposal: took = 94.795766ms https://192.168.1.63:2379 is healthy: successfully committed proposal: took = 96.143882ms二、master部署
2.1 生成证书
kubernetes 组件需要使用x509证书对通信进行加密和认证，创建一套CA自签名根证书。创建的CA为私有内部认证中心，认证中心也需要一个CA证书和相应的CA私钥，CA私钥需要妥善保管，拥有私钥可以欺骗CA颁发证书。
2.1.1 创建CA根证书
```html/xml[root@km01 k8sssl]# mkdir -p /root/k8sssl && cd /root/k8sssl
CA证书集群共享，只需一个，后续创建证书子CA证书根据config的profile生成[root@km01 k8sssl]# cat > ca-config.json << EOF{"signing": {"default": {"expiry": "87600h"},"profiles": {"kubernetes": {"expiry": "87600h","usages": ["signing","key encipherment","server auth","client auth"]}}}}EOF
创建根CA证书签名请求文件cat > ca-csr.json << EOF{"CN": "kubernetes","key": {"algo": "rsa","size": 2048},"names": [{"C": "CN","L": "Beijing","ST": "Beijing","O": "k8s","OU": "System"}]}EOF
#### 2.1.2 生成CA证书(ca.pem)和密钥(ca-key.pem)cfssl gencert -initca ca-csr.json | cfssljson -bare ca -[root@km01 k8sssl]# ls ca*ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem
### 2.2 部署kube-apiserver组件 1> 使用CA签发kube-apiserver https证书[root@km01 k8sssl]# cat server-csr.json {"CN": "kubernetes","hosts": ["10.0.0.1","127.0.0.1","192.168.1.31","192.168.1.32","192.168.1.33", //ip预留用于扩展，master-ip、LB-ip、VIP"192.168.1.30","192.168.1.34","kubernetes","kubernetes.default","kubernetes.default.svc","kubernetes.default.svc.cluster","kubernetes.default.svc.cluster.local"],"key": {"algo": "rsa","size": 2048},"names": [{"C": "CN","L": "BeiJing","ST": "BeiJing","O": "k8s","OU": "System"}]}
2> 解压拷贝[root@km01 k8sssl]# mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}[root@km01 k8sssl]# tar xzvf kubernetes-server-linux-amd64-1.18.6.tar.gz[root@km01 k8sssl]# cd /root/kuberneters/server/bin/ && cp kube-apiserver kube-sheduler kube-controller-manager /opt/kubernetes/bin && cp kubectl /usr/local/bin
3> 创建kube-apiserver.conf[root@km01 k8sssl]# cat > /opt/kubernetes/cfg/kube-apiserver.conf << EOFKUBE_APISERVER_OPTS="--logtostderr=false \--v=2 \--log-dir=/opt/kubernetes/logs \--etcd-servers=https://192.168.1.61:2379,https://192.168.1.62:2379,https://192.168.1.63:2379 \--bind-address=192.168.1.31 \--secure-port=6443 \--advertise-address=192.168.1.31 \--allow-privileged=true \--service-cluster-ip-range=10.0.0.0/24 \--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \--authorization-mode=RBAC,Node \--enable-bootstrap-token-auth=true \--token-auth-file=/opt/kubernetes/cfg/token.csv \--service-node-port-range=30000-32767 \--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem \--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem \--tls-cert-file=/opt/kubernetes/ssl/server.pem \--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \--client-ca-file=/opt/kubernetes/ssl/ca.pem \--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \--service-account-issuer=api \--service-account-signing-key-file=/opt/kubernetes/ssl/server-key.pem \--etcd-cafile=/opt/etcd/ssl/ca.pem \--etcd-certfile=/opt/etcd/ssl/server.pem \--etcd-keyfile=/opt/etcd/ssl/server-key.pem \--requestheader-client-ca-file=/opt/kubernetes/ssl/ca.pem \--proxy-client-cert-file=/opt/kubernetes/ssl/server.pem \--proxy-client-key-file=/opt/kubernetes/ssl/server-key.pem \--requestheader-allowed-names=kubernetes \--requestheader-extra-headers-prefix=X-Remote-Extra- \--requestheader-group-headers=X-Remote-Group \--requestheader-username-headers=X-Remote-User \--enable-aggregator-routing=true \--audit-log-maxage=30 \--audit-log-maxbackup=3 \--audit-log-maxsize=100 \--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"EOF
```html/xml 注：上面两个\ \ 第一个是转义符，第二个是换行符，使用转义符是为了使用EOF保留换行符 参数说明： --logtostderr：启用日志 --v：日志等级 --log-dir：日志目录 --etcd-servers：etcd集群地址 --bind-address：监听地址 --secure-port：https安全端口 --advertise-address：集群通告地址 --allow-privileged：启用授权 --service-cluster-ip-range：Service虚拟IP地址段 --enable-admission-plugins：准入控制模块 --authorization-mode：认证授权，启用RBAC授权和节点自管理 --enable-bootstrap-token-auth：启用TLS bootstrap机制 --token-auth-file：bootstrap token文件 --service-node-port-range：Service nodeport类型默认分配端口范围 --kubelet-client-xxx：apiserver访问kubelet客户端证书 --tls-xxx-file：apiserver https证书 1.20版本必须加的参数：--service-account-issuer，--service-account-signing-key-file --etcd-xxxfile：连接Etcd集群证书 --audit-log-xxx：审计日志 启动聚合层相关配置：--requestheader-client-ca-file，--proxy-client-cert-file，--proxy-client-key-file，--requestheader-allowed-names，--requestheader-extra-headers-prefix，--requestheader-group-headers，--requestheader-username-headers，--enable-aggregator-routing4> 拷贝kube-apiserver所需的证书拷贝证书到kube-apiserver认证目录,将etcd(192.168.1.61) 中的ssl证书拷贝至k8s(192.168.1.31)的/opt/etcd/ssl```html/xml
k8s证书拷贝
cp /root/k8sssl/ca*pem /opt/kubernetes/ssl/
etcd证书拷贝
mkdir -p /opt/etcd/scp root@192.168.1.61:/opt/etcd/ssl/ /opt/etcd/
生成kube-apiserver中使用的token.csv文件cat > /opt/kubernetes/cfg/token.csv << EOF5787e762eca4453de8bfb2f8f52733c3,kubelet-bootstrap,10001,"system:node-bootstrapper"EOF
重新生成替换head -c 16 /dev/urandom | od -An -t x | tr -d ' '
5> systemd管理api-server、开机启动cat > /usr/lib/systemd/system/kube-apiserver.service << EOF[Unit]Description=Kubernetes API ServerDocumentation=https://github.com/kubernetes/kubernetes
[Service]EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.confExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTSRestart=on-failure
[Install]WantedBy=multi-user.targetEOF
systemctl daemon-reloadsystemctl start kube-apiserversystemctl enable kube-apiserver
### 3.3 部署kube-controller-manager 1> 创建配置文件 ```html/xml [root@km01 cfg]# cat /opt/kubernetes/cfg/kube-controller-manager.conf KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \ --v=2 \ --log-dir=/opt/kubernetes/logs \ --leader-elect=true \ --kubeconfig=/opt/kubernetes/cfg/kube-controller-manager.kubeconfig \ --bind-address=127.0.0.1 \ --allocate-node-cidrs=true \ --cluster-cidr=10.244.0.0/16 \ --service-cluster-ip-range=10.0.0.0/24 \ --cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \ --cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \ --root-ca-file=/opt/kubernetes/ssl/ca.pem \ --service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \ --experimental-cluster-signing-duration=87600h0m0s"--kubeconfig：连接apiserver配置文件--leader-elect：当该组件启动多个时，自动选举（HA）--cluster-signing-cert-file/--cluster-signing-key-file：自动为kubelet颁发证书的CA，与apiserver保持一致
2> 生成kubeconfig文件生成证书
cd /root/k8sssl cat > kube-controller-manager-csr.json << EOF { "CN": "system:kube-controller-manager", "hosts": [], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing", "O": "system:masters", "OU": "System" } ] } EOF 生成证书 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager生成kubeconfig文件
KUBE_CONFIG="/opt/kubernetes/cfg/kube-controller-manager.kubeconfig" KUBE_APISERVER="https://192.168.1.31:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/opt/kubernetes/ssl/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=${KUBE_CONFIG} kubectl config set-credentials kube-controller-manager \ --client-certificate=./kube-controller-manager.pem \ --client-key=./kube-controller-manager-key.pem \ --embed-certs=true \ --kubeconfig=${KUBE_CONFIG} kubectl config set-context default \ --cluster=kubernetes \ --user=kube-controller-manager \ --kubeconfig=${KUBE_CONFIG} kubectl config use-context default --kubeconfig=${KUBE_CONFIG}3> 设置开机启动
配置system管理文件 cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF [Unit] Description=Kubernetes Controller Manager Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF 设置开机启动 systemctl daemon-reload systemctl start kube-controller-manager systemctl enable kube-controller-manager3.4 kube-scheduler部署
1> kube-scheduler.conf 配置文件
cat > /opt/kubernetes/cfg/kube-scheduler.conf << EOF KUBE_SCHEDULER_OPTS="--logtostderr=false \\ --v=2 \\ --log-dir=/opt/kubernetes/logs \\ --leader-elect \\ --kubeconfig=/opt/kubernetes/cfg/kube-scheduler.kubeconfig \\ --bind-address=127.0.0.1" EOF参数说明：--kubeconfig：连接apiserver配置文件--leader-elect：当该组件启动多个时，自动选举（HA）
2> 生成kubeconfig文件生成kube-scheduler证书
cd /root/k8sssl 创建证书请求文件 cat > kube-scheduler-csr.json << EOF { "CN": "system:kube-scheduler", "hosts": [], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing", "O": "system:masters", "OU": "System" } ] } EOF # 生成证书 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler3> 生成kubeconfig文件
KUBE_CONFIG="/opt/kubernetes/cfg/kube-scheduler.kubeconfig" KUBE_APISERVER="https://192.168.1.31:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/opt/kubernetes/ssl/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=${KUBE_CONFIG} kubectl config set-credentials kube-scheduler \ --client-certificate=./kube-scheduler.pem \ --client-key=./kube-scheduler-key.pem \ --embed-certs=true \ --kubeconfig=${KUBE_CONFIG} kubectl config set-context default \ --cluster=kubernetes \ --user=kube-scheduler \ --kubeconfig=${KUBE_CONFIG} kubectl config use-context default --kubeconfig=${KUBE_CONFIG}4> system管理、开机启动
cat > /usr/lib/systemd/system/kube-scheduler.service << EOF [Unit] Description=Kubernetes Scheduler Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl start kube-scheduler systemctl enable kube-scheduler5> 集群状态 (kubectl get cs)kubelet连接集群证书
cat > admin-csr.json <<EOF { "CN": "admin", "hosts": [], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing", "O": "system:masters", "OU": "System" } ] } EOF #生成证书 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin #查看admin [root@km01 k8sssl]# ls admin* admin.csr admin-csr.json admin-key.pem admin.pem生成kubeconfig文件
mkdir /root/.kube KUBE_CONFIG="/root/.kube/config" KUBE_APISERVER="https://192.168.1.31:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/opt/kubernetes/ssl/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=${KUBE_CONFIG} kubectl config set-credentials cluster-admin \ --client-certificate=./admin.pem \ --client-key=./admin-key.pem \ --embed-certs=true \ --kubeconfig=${KUBE_CONFIG} kubectl config set-context default \ --cluster=kubernetes \ --user=cluster-admin \ --kubeconfig=${KUBE_CONFIG} kubectl config use-context default --kubeconfig=${KUBE_CONFIG}查看集群状态
[root@km01 k8sssl]# kubectl get cs NAME STATUS MESSAGE ERROR scheduler Healthy ok controller-manager Healthy ok etcd-0 Healthy {"health":"true"} etcd-1 Healthy {"health":"true"} etcd-2 Healthy {"health":"true"}6>授权kubelet-bootstrap用户允许证书请求
kubectl create clusterrolebinding kubelet-bootstrap \ --clusterrole=system:node-bootstrapper \ --user=kubelet-bootstrap7> 部署CNI容器网络
[root@km01 ~]# cd ~ [root@km01 ~]# wget https://github.com/containernetworking/plugins/releases/download/v0.8.6/cni-plugins-linux-amd64-v0.8.6.tgz [root@km01 ~]# mkdir -pv /opt/cni/bin [root@km01 ~]# tar xf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin [root@km01 ~]# ls /opt/cni/bin bandwidth bridge dhcp firewall flannel host-device host-local ipvlan loopback macvlan portmap ptp sbr static tuning vlan三、部署node节点
master同时做为node节点
3.1 部署kubelet
1> 拷贝文件（master 或者 node 节点)
非master-node节点需要在node节点创建目录 mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs} 从解压文件拷贝kubelet kube-proxy kubectl cp kubelet kube-proxy /opt/kubernetes/bin cp kubectl /usr/local/bin2> 创建kubelet.conf拉取amd镜像
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1创建配置文件 kubelet.conf
cat > /opt/kubernetes/cfg/kubelet.conf << EOF KUBELET_OPTS="--logtostderr=false \\ --v=2 \\ --log-dir=/opt/kubernetes/logs \\ --hostname-override=k8s-master1 \\ --network-plugin=cni \\ --kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\ --bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\ --config=/opt/kubernetes/cfg/kubelet-config.yml \\ --cert-dir=/opt/kubernetes/ssl \\ --pod-infra-container-image=lizhenliang/pause-amd64:3.0" EOF参数说明：--hostname-override：集群显示名称--network-plugin：启用CNI--kubeconfig：空路径，会自动生成，后面用于连接apiserver--bootstrap-kubeconfig：首次启动向apiserver申请证书--config：配置参数文件--cert-dir：kubelet证书生成目录--pod-infra-container-image：pause镜像700KB，解决Pod网络共享
3> 配置kubelet-config.yml 文件 | --config=/opt/kubernetes/cfg/kubelet-config.yml
cat > /opt/kubernetes/cfg/kubelet-config.yml << EOF kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 address: 0.0.0.0 port: 10250 readOnlyPort: 10255 cgroupDriver: cgroupfs clusterDNS: - 10.0.0.2 clusterDomain: cluster.local failSwapOn: false authentication: anonymous: enabled: false webhook: cacheTTL: 2m0s enabled: true x509: clientCAFile: /opt/kubernetes/ssl/ca.pem authorization: mode: Webhook webhook: cacheAuthorizedTTL: 5m0s cacheUnauthorizedTTL: 30s evictionHard: imagefs.available: 15% memory.available: 100Mi nodefs.available: 10% nodefs.inodesFree: 5% maxOpenFiles: 1000000 maxPods: 110 EOF4> 生成kubelet加入集群的kubeconfig文件
KUBE_CONFIG="/opt/kubernetes/cfg/bootstrap.kubeconfig" KUBE_APISERVER="https://192.168.1.31:6443" // apiserver:6443 TOKEN="" //与前token.csv一致 # 生成 kubelet bootstrap kubeconfig 配置文件 kubectl config set-cluster kubernetes \ --certificate-authority=/opt/kubernetes/ssl/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=${KUBE_CONFIG} kubectl config set-credentials "kubelet-bootstrap" \ --token=${TOKEN} \ --kubeconfig=${KUBE_CONFIG} kubectl config set-context default \ --cluster=kubernetes \ --user="kubelet-bootstrap" \ --kubeconfig=${KUBE_CONFIG} kubectl config use-context default --kubeconfig=${KUBE_CONFIG}5> systemd管理、开机启动
cat > /usr/lib/systemd/system/kubelet.service << EOF [Unit] Description=Kubernetes Kubelet After=docker.service [Service] EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl start kubelet systemctl enable kubelet6> 允许kubelet的证书申请准入集群
kubectl get csr kubectl certificate approve `kubectl get csr | grep Pending| awk '{print $1}'` kubectl get node | 可以看到km01 为not ready状态，是因为网络插件未安装3.2 部署kube-proxy
1> 创建配置文件 kube-proxy.conf
[root@km01 cfg]# cat > /opt/kubernetes/cfg/kube-proxy.conf << EOF KUBE_PROXY_OPTS="--logtostderr=false \\ --v=2 \\ --log-dir=/opt/kubernetes/logs \\ --config=/opt/kubernetes/cfg/kube-proxy-config.yml" EOF2> 创建kube-proxy-config.yml | kube-proxy.conf 中的--config=/opt/kubernetes/cfg/kube-proxy-config.yml
[root@km01 cfg]# cat > /opt/kubernetes/cfg/kube-proxy-config.yml <<EOF kind: KubeProxyConfiguration apiVersion: kubeproxy.config.k8s.io/v1alpha1 bindAddress: 0.0.0.0 metricsBindAddress: 0.0.0.0:10249 clientConnection: kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig hostnameOverride: km01 clusterCIDR: 10.0.0.0/24 EOF3> 生成kube-proxy.kubeconfig文件
cd /root/k8sssl # 证书请求文件 cat > kube-proxy-csr.json << EOF { "CN": "system:kube-proxy", "hosts": [], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing", "O": "k8s", "OU": "System" } ] } EOF #生成证书 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy生成kubeconfig文件
KUBE_CONFIG="/opt/kubernetes/cfg/kube-proxy.kubeconfig" KUBE_APISERVER="https://192.168.1.31:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/opt/kubernetes/ssl/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=${KUBE_CONFIG} kubectl config set-credentials kube-proxy \ --client-certificate=./kube-proxy.pem \ --client-key=./kube-proxy-key.pem \ --embed-certs=true \ --kubeconfig=${KUBE_CONFIG} kubectl config set-context default \ --cluster=kubernetes \ --user=kube-proxy \ --kubeconfig=${KUBE_CONFIG} kubectl config use-context default --kubeconfig=${KUBE_CONFIG}4> systemd、开机启动
cat > /usr/lib/systemd/system/kube-proxy.service << EOF [Unit] Description=Kubernetes Proxy After=network.target [Service] EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl start kube-proxy systemctl enable kube-proxy3.3 flannel 安装
1> 创建目录
mkdir -p /etc/cni/ && mkdir -p /etc/kube-flannel2> 下载kube-flannel 并安装
curl -o kube-flannel.yml https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml #先拉取镜像执行文件 [root@km01 ~]# grep image kube-flannel.yml image: quay.io/coreos/flannel:v0.14.0 docker pull quay.io/coreos/flannel:v0.14.0 # apply flannel.yml [root@km01 ~]# kubectl apply -f kube-flannel.yml podsecuritypolicy.policy/psp.flannel.unprivileged configured clusterrole.rbac.authorization.k8s.io/flannel unchanged clusterrolebinding.rbac.authorization.k8s.io/flannel unchanged serviceaccount/flannel unchanged configmap/kube-flannel-cfg unchanged daemonset.apps/kube-flannel-ds unchanged # kube-flannel 文件 --- 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/v1 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/v1 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:v0.14.0 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:v0.14.0 command: - /opt/bin/flanneld args: - --ip-masq - --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: 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-cfg3> 授权apiserver访问kubelet在执行kubectl exec、run、logs 等命令时，apiserver会转发到kubelet。这里定义 RBAC规则，授权apiserver调用kubelet API"apiserver-to-kubelet-rbac.yaml 文件
[root@km01 ~]# cat > apiserver-to-kubelet-rbac.yaml << EOF apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: annotations: rbac.authorization.kubernetes.io/autoupdate: "true" labels: kubernetes.io/bootstrapping: rbac-defaults name: system:kube-apiserver-to-kubelet rules: - apiGroups: - "" resources: - nodes/proxy - nodes/stats - nodes/log - nodes/spec - nodes/metrics - pods/log verbs: - "*" --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: system:kube-apiserver namespace: "" roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:kube-apiserver-to-kubelet subjects: - apiGroup: rbac.authorization.k8s.io kind: User name: kubernetes EOF执行文件
[root@km01 ~]# kubectl apply -f apiserver-to-kubelet-rbac.yaml clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet unchanged clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver unchanged3.4 coredns 安装
1> 生成coredns.yaml
git clone https://github.com/coredns/deployment.git --depth=1 yum install epel-release -y && yum install jq cd /root/deployment/kubernetes/ ./deploy.sh -i 10.0.0.2 > coredns.yamlcoredns 文件内容:
[root@master kubernetes]# cat coredns.yaml apiVersion: v1 kind: ServiceAccount metadata: name: coredns namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: labels: kubernetes.io/bootstrapping: rbac-defaults name: system:coredns rules: - apiGroups: - "" resources: - endpoints - services - pods - namespaces verbs: - list - watch - apiGroups: - discovery.k8s.io resources: - endpointslices verbs: - list - watch --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: annotations: rbac.authorization.kubernetes.io/autoupdate: "true" labels: kubernetes.io/bootstrapping: rbac-defaults name: system:coredns roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:coredns subjects: - kind: ServiceAccount name: coredns namespace: kube-system --- apiVersion: v1 kind: ConfigMap metadata: name: coredns namespace: kube-system data: Corefile: | .:53 { errors health { lameduck 5s } ready kubernetes cluster.local in-addr.arpa ip6.arpa { fallthrough in-addr.arpa ip6.arpa } prometheus :9153 forward . /etc/resolv.conf { max_concurrent 1000 } cache 30 loop reload loadbalance } --- apiVersion: apps/v1 kind: Deployment metadata: name: coredns namespace: kube-system labels: k8s-app: kube-dns kubernetes.io/name: "CoreDNS" spec: # replicas: not specified here: # 1. Default is 1. # 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on. strategy: type: RollingUpdate rollingUpdate: maxUnavailable: 1 selector: matchLabels: k8s-app: kube-dns template: metadata: labels: k8s-app: kube-dns spec: priorityClassName: system-cluster-critical serviceAccountName: coredns tolerations: - key: "CriticalAddonsOnly" operator: "Exists" nodeSelector: kubernetes.io/os: linux affinity: podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 100 podAffinityTerm: labelSelector: matchExpressions: - key: k8s-app operator: In values: ["kube-dns"] topologyKey: kubernetes.io/hostname containers: - name: coredns image: coredns/coredns:1.8.4 imagePullPolicy: IfNotPresent resources: limits: memory: 170Mi requests: cpu: 100m memory: 70Mi args: [ "-conf", "/etc/coredns/Corefile" ] volumeMounts: - name: config-volume mountPath: /etc/coredns readOnly: true ports: - containerPort: 53 name: dns protocol: UDP - containerPort: 53 name: dns-tcp protocol: TCP - containerPort: 9153 name: metrics protocol: TCP securityContext: allowPrivilegeEscalation: false capabilities: add: - NET_BIND_SERVICE drop: - all readOnlyRootFilesystem: true livenessProbe: httpGet: path: /health port: 8080 scheme: HTTP initialDelaySeconds: 60 timeoutSeconds: 5 successThreshold: 1 failureThreshold: 5 readinessProbe: httpGet: path: /ready port: 8181 scheme: HTTP dnsPolicy: Default volumes: - name: config-volume configMap: name: coredns items: - key: Corefile path: Corefile --- apiVersion: v1 kind: Service metadata: name: kube-dns namespace: kube-system annotations: prometheus.io/port: "9153" prometheus.io/scrape: "true" labels: k8s-app: kube-dns kubernetes.io/cluster-service: "true" kubernetes.io/name: "CoreDNS" spec: selector: k8s-app: kube-dns clusterIP: 10.0.0.2 ports: - name: dns port: 53 protocol: UDP - name: dns-tcp port: 53 protocol: TCP - name: metrics port: 9153 protocol: TCP2> 安装coredns
[root@km01 ~]# kubectl apply -f ./deployment/kubernetes/coredns.yaml serviceaccount/coredns unchanged clusterrole.rbac.authorization.k8s.io/system:coredns unchanged clusterrolebinding.rbac.authorization.k8s.io/system:coredns unchanged configmap/coredns unchanged deployment.apps/coredns unchanged service/kube-dns unchanged # 查看coredns [root@km01 ~]# kubectl get pods -o wide -n kube-system NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES coredns-6d99d5879f-gqc28 1/1 Running 1 29h 10.244.1.3 km01 <none> <none>3> 测试coredns
[root@km01 ~]# cat coredns-test.yaml apiVersion: v1 kind: Pod metadata: name: busybox namespace: default spec: containers: - image: busybox:1.28.4 command: - sleep - "3600" imagePullPolicy: IfNotPresent name: busybox restartPolicy: Always [root@km01 ~]# kubectl exec -it busybox sh kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead. / # nslookup kubernetes Server: 10.0.0.2 Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local Name: kubernetes Address 1: 10.0.0.1 kubernetes.default.svc.cluster.local四、新增node节点(非master)
4.1 安装docker
yum install docker-ce-18.09.9 -y systemctl enable docker systemctl start docker4.2 拷贝文件到node节点
1> 拷贝node相关文件到新增加节点 192.168.1.82
在192.168.1.31(master-node)执行: scp -r /opt/kubernetes root@node02:/opt/ scp -r /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@node02:/usr/lib/system/system/2> 删除kubelet证书和kubeconfig文件以下文件是证书申请审批后自动生成的，每个Node不同，必须删除
在node02执行: rm -f /opt/kubernetes/cfg/kubelet.kubeconfig rm -f /opt/kubernetes/ssl/kubelet*3> 修改配置文件中的主机名
vim /opt/kubernetes/cfg/kubelet.conf --hostname-override=node02 vim /opt/kubernetes/cfg/kube-proxy-config.yml hostnameOverride: node024.3 启动kubelet kube-proxy
systemctl daemon-reload systemctl start kubelet kube-proxy systemctl enable kubelet kube-proxy # status running 状态 systemctl status kubelet systemctl status kube-proxy4.4 master批准node的kubelet加入请求
# 查看 [root@km01 ~]# kubectl get csr NAME AGE SIGNERNAME REQUESTOR CONDITION node-csr-XY1MTmwMz8rnYLFbib6OaRdI4lyK52cvffpu3BAO1vU 53s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending # 批准 [root@km01 ~]# kubectl certificate approve node-csr-XY1MTmwMz8rnYLFbib6OaRdI4lyK52cvffpu3BAO1vU certificatesigningrequest.certificates.k8s.io/node-csr-XY1MTmwMz8rnYLFbib6OaRdI4lyK52cvffpu3BAO1vU approved [root@km01 ~]# kubectl get csr NAME AGE SIGNERNAME REQUESTOR CONDITION node-csr-XY1MTmwMz8rnYLFbib6OaRdI4lyK52cvffpu3BAO1vU 4m57s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Approved,Issued4.5 查看状态
1> 查看flannel部署状态
[root@km01 ~]# kubectl get pods -n kube-system -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES kube-flannel-ds-j2nr7 1/1 Running 1 30h 192.168.1.31 km01 <none> <none> kube-flannel-ds-kg8n2 1/1 Running 1 30h 192.168.1.81 node01 <none> <none> kube-flannel-ds-nrl6q 1/1 Running 0 17m 192.168.1.82 node02 <none> <none> kube-flannel-ds-qbrxx 1/1 Running 1 29h 192.168.1.32 km02 <none> <none>2> 查看集群状态
[root@km01 ~]# kubectl get node -o wide NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME km01 Ready <none> 31h v1.18.6 192.168.1.31 <none> CentOS Linux 7 (Core) 3.10.0-1160.36.2.el7.x86_64 docker://18.9.9 km02 Ready <none> 28h v1.18.6 192.168.1.32 <none> CentOS Linux 7 (Core) 3.10.0-1160.36.2.el7.x86_64 docker://18.9.9 node01 Ready <none> 30h v1.18.6 192.168.1.81 <none> CentOS Linux 7 (Core) 3.10.0-1160.36.2.el7.x86_64 docker://18.9.9 node02 Ready <none> 3m45s v1.18.6 192.168.1.82 <none> CentOS Linux 7 (Core) 3.10.0-1160.36.2.el7.x86_64 docker://18.9.9五、部署master02节点
1> docker安装（略）2> 创建etcd ssl目录
mkdir -p /opt/etcd/ssl3> 将master01文件拷贝至master02
scp -r /opt/kubernetes/ root@192.168.1.32:/opt scp -r /opt/etcd/ssl root@192.168.1.32:/opt/etcd/ scp /usr/lib/systemd/system/kube* root@192.168.1.32:/usr/lib/systemd/system/ scp /usr/local/bin/kubectl root@192.168.1.32:/usr/local/bin/ scp -r /root/.kube root@192.168.1.32:~4> 删除证书
rm -rf /opt/kubernetes/cfg/kubelet.kubeconfig rm -rf /opt/kubernetes/ssl/kubelet*5> 修改ip、主机名
vim /opt/kubernetes/cfg/kube-apiserver.conf --bind-address=192.168.1.32 \ --secure-port=6443 \ --advertise-address=192.168.1.32 \ vim /opt/kubernetes/cfg/kubelet.conf --hostname-override=km02 \ vim /opt/kubernetes/cfg/kube-proxy-config.yml hostnameOverride: km026> 开机启动
systemctl daemon-reload systemctl start kube-apiserver kube-controller-manager kube-scheduler kubelet kube-proxy systemctl enable kube-apiserver kube-controller-manager kube-scheduler kubelet kube-proxy7> 修改~/.kube/config连接ip
server: https://192.168.1.32:64438> 证书请求、批准
[root@km01 ~]# kubectl get csr [root@km01 ~]# kubectl certificate approve `kubectl get csr | grep "Pending" | awk '{print $1}'`9> 查看集群最终状态
[root@km02 ~]# kubectl get cs NAME STATUS MESSAGE ERROR scheduler Healthy ok controller-manager Healthy ok etcd-0 Healthy {"health":"true"} etcd-1 Healthy {"health":"true"} etcd-2 Healthy {"health":"true"} [root@km02 ~]# kubectl get node -o wide NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME km01 Ready <none> 45h v1.18.6 192.168.1.31 <none> CentOS Linux 7 (Core) 3.10.0-1160.36.2.el7.x86_64 docker://18.9.9 km02 Ready <none> 43h v1.18.6 192.168.1.32 <none> CentOS Linux 7 (Core) 3.10.0-1160.36.2.el7.x86_64 docker://18.9.9 node01 Ready <none> 45h v1.18.6 192.168.1.81 <none> CentOS Linux 7 (Core) 3.10.0-1160.36.2.el7.x86_64 docker://18.9.9 node02 Ready <none> 14h v1.18.6 192.168.1.82 <none> CentOS Linux 7 (Core) 3.10.0-1160.36.2.el7.x86_64 docker://18.9.9六、 node节点连接VIP
6.1 修改node节点（node01,node02)kubelet、kube-proxy的api-server_IP
vim /opt/kubernetes/cfg/bootstrap.kubeconfigserver: https://192.168.1.30
vim /opt/kubernetes/cfg/kubelet.kubeconfigserver: https://192.168.1.30:8443
vim /opt/kubernetes/cfgkube-proxy.kubeconfigserver: https://192.168.1.30:8443
6.2 批准node加入
[root@km01 ~]# kubectl get csr NAME AGE SIGNERNAME REQUESTOR CONDITION node-csr-MnhFWNifNhUeRTRJ6m5sHUmvEOsuRGvlJWxAl_f_pdc 28m kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending [root@km01 ~]# kubectl certificate approved node-csr-MnhFWNifNhUeRTRJ6m5sHUmvEOsuRGvlJWxAl_f_pdc七、ngx、haproxy 配置
6.1 拓扑
6.2 安装nginx
1> nginx 软件版本: nginx-1.20.1.tar.gz ,安装
tar xzvf nginx-1.20.1.tar.gz yum install gcc* zlib zlib-devel openssl openssl-devel pcre-devel -y cd nginx-1.20.1 ./configure --with-http_v2_module --with-http_ssl_module --with-http_sub_module --with-http_stub_status_module --with-http_gzip_static_module --with-pcre --with-http_realip_module --with-stream make && make install2> nginx配置两台ngx 配置相同内容如下，通过四层代理，监听本地8443端口，代理后端km01,km02的api-server:6443
stream { log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent'; access_log /var/log/nginx/k8s-access.log main; upstream k8s-apiserver { server 192.168.1.32:6443; server 192.168.1.31:6443; } server { listen 8443; proxy_pass k8s-apiserver; } }6.3 安装keepalived
1> 安装keepalivedyum install keepalived -y2> keepalived配置keepalived master配置 ，backup配置把优先级调低即可
global_defs { smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_strict chk_ngx { script "/data/check_nginx.sh" interval 2 #2s 运行script行 } } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.30/24 } track_script { chk_ngx } }3> check_nginx.sh 脚本
#!/bin/bash A=`ps -C nginx --no-header |wc -l` # 判断nginx进程是否在线，如果不在尝试重启 if [ $A -eq 0 ];then /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf fi sleep 2 #等待2s再次检查，如果ngx未启动kill keepalived进程 if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then killall keepalived fi chmod +x /etc/keepalived/check_nginx.sh##八、 测试
[root@km01 ~]# netstat -anlput | grep 8443 tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN 54187/nginx: master tcp 0 0 192.168.1.30:8443 192.168.1.81:46050 ESTABLISHED 54188/nginx: worker tcp 0 0 192.168.1.30:8443 192.168.1.81:46062 ESTABLISHED 54188/nginx: worker [root@node01 cfg]# curl -k https://192.168.1.30:8443/version { "major": "1", "minor": "18", "gitVersion": "v1.18.6", "gitCommit": "dff82dc0de47299ab66c83c626e08b245ab19037", "gitTreeState": "clean", "buildDate": "2020-07-15T16:51:04Z", "goVersion": "go1.13.9", "compiler": "gc", "platform": "linux/amd64" [root@km01 ~]# kubectl get pods -n kube-system -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES coredns-6d99d5879f-gqc28 1/1 Running 5 3d6h 10.244.1.7 km01 <none> <none> kube-flannel-ds-j2nr7 1/1 Running 20 3d7h 192.168.1.31 km01 <none> <none> kube-flannel-ds-kg8n2 1/1 Running 5 3d7h 192.168.1.81 node01 <none> <none> kube-flannel-ds-nrl6q 1/1 Running 4 2d1h 192.168.1.82 node02 <none> <none> kube-flannel-ds-qbrxx 1/1 Running 7 3d6h 192.168.1.32 km02 <none> <none>后续继续更新完善！！！