一、部署kube-proxy
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1、创建csr请求文件
cat > kube-proxy-csr.json << EOF { "CN": "system:kube-proxy", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "Sichuan", "L": "Chengdu", "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
2、创建kubeconfig文件
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://192.168.112.130:7443 --kubeconfig=kube-proxy.kubeconfig kubectl config set-credentials kube-proxy --client-certificate=kube-proxy.pem --client-key=kube-proxy-key.pem --embed-certs=true --kubeconfig=kube-proxy.kubeconfig kubectl config set-context default --cluster=kubernetes --user=kube-proxy --kubeconfig=kube-proxy.kubeconfig kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
3、创建kube-proxy配置文件
cat > /opt/kubernetes/cfg/kube-proxy.yaml << EOF apiVersion: kubeproxy.config.k8s.io/v1alpha1 bindAddress: 192.168.112.130 clientConnection: kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig clusterCIDR: 192.168.0.0/16 #此处网段必须与网络组件网段保持一致,否则部署网络组件时会报错 healthzBindAddress: 192.168.112.130:10256 kind: KubeProxyConfiguration metricsBindAddress: 192.168.112.130:10249 mode: "ipvs" EOF
注:配置文件kube-proxy.yaml中address修改为各节点的实际IP
4、创建启动文件
cat > /usr/lib/systemd/system/kube-proxy.service << EOF [Unit] Description=Kubernetes Kube-Proxy Server Documentation=https://github.com/kubernetes/kubernetes After=network.target [Service] WorkingDirectory=/opt/kubernetes/kube-proxy ExecStart=/opt/kubernetes/bin/kube-proxy \ --config=/opt/kubernetes/cfg/kube-proxy.yaml \ --alsologtostderr=true \ --logtostderr=false \ --log-dir=/opt/kubernetes/logs \ --v=2 Restart=on-failure RestartSec=5 LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF
5、同步文件到各个节点
cp kube-proxy*.pem /opt/kubernetes/ssl/ cp kube-proxy.kubeconfig /opt/kubernetes/cfg scp /usr/lib/systemd/system/kube-proxy.service root@192.168.112.132:/usr/lib/systemd/system/ cd /root/TLS/k8s/kubernetes/server/bin cp kube-proxy /opt/kubernetes/bin/ scp kube-proxy root@192.168.112.132:/opt/kubernetes/bin/
6、启动服务
mkdir -p /opt/kubernetes/kube-proxy systemctl daemon-reload systemctl enable kube-proxy systemctl restart kube-proxy systemctl status kube-proxy
二、安装网络插件
1、配置网络组件
#下载yaml文件 wget https://docs.projectcalico.org/v3.14/manifests/calico.yaml #搜索这行关键字 - name: IP value: "autodetect" 在它之前添加两行 # Auto-detect the BGP IP address. - name: IP_AUTODETECTION_METHOD value: "interface=eth0" #你得具体网卡名字 #创建网络插件容器 kubectl apply -f calico.yaml
2、查看各个节点,均为Ready状态
kubectl get pods -A -o wide kubectl get nodes
三、部署coredns
1、部署coredns
#下载yaml文件
wget https://raw.githubusercontent.com/coredns/deployment/master/kubernetes/coredns.yaml.sed mv coredns.yaml.sed coredns.yaml
2、修改文件里面内容
修改yaml文件 kubernetes CLUSTER_DOMAIN REVERSE_CIDRS 改为 kubernetes cluster.local in-addr.arpa ip6.arpa forward . UPSTREAMNAMESERVER 改为 forward . /etc/resolv.conf clusterIP: CLUSTER_DNS_IP 改为 clusterIP: 10.255.0.2 去掉STUBDOMAINS
3、创建容器
kubectl apply -f coredns.yaml
4、DNS解析测试
kubectl run -it --rm dns-test --image=busybox:1.28.4 sh If you don't see a command prompt, try pressing enter. / # 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
5、如果报以下错误,请安装服务,之后重启kube-proxy
systemctl status kube-proxy ● kube-proxy.service - Kubernetes Kube-Proxy Server Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled) Active: active (running) since 一 2021-08-09 17:51:04 CST; 5min ago Docs: https://github.com/kubernetes/kubernetes Main PID: 903 (kube-proxy) Tasks: 8 Memory: 44.3M CGroup: /system.slice/kube-proxy.service └─903 /opt/kubernetes/bin/kube-proxy --config=/opt/kubernetes/cfg/kube-proxy.yaml --alsologtostderr=true --logtostderr=false --log-dir=/opt/kubernetes/logs --v=2 8月 09 17:51:50 k8s-master kube-proxy[903]: I0809 17:51:50.478753 903 service.go:275] Service default/kubernetes updated: 1 ports 8月 09 17:51:50 k8s-master kube-proxy[903]: I0809 17:51:50.478802 903 service.go:275] Service kube-system/kube-dns updated: 3 ports 8月 09 17:51:50 k8s-master kube-proxy[903]: I0809 17:51:50.555611 903 shared_informer.go:247] Caches are synced for service config 8月 09 17:51:50 k8s-master kube-proxy[903]: I0809 17:51:50.555962 903 service.go:390] Adding new service port "kube-system/kube-dns:dns" at 10.255.0.2:53/UDP 8月 09 17:51:50 k8s-master kube-proxy[903]: I0809 17:51:50.555993 903 service.go:390] Adding new service port "kube-system/kube-dns:dns-tcp" at 10.255.0.2:53/TCP 8月 09 17:51:50 k8s-master kube-proxy[903]: I0809 17:51:50.556009 903 service.go:390] Adding new service port "kube-system/kube-dns:metrics" at 10.255.0.2:9153/TCP 8月 09 17:51:50 k8s-master kube-proxy[903]: I0809 17:51:50.556024 903 service.go:390] Adding new service port "default/kubernetes:https" at 10.255.0.1:443/TCP 8月 09 17:51:50 k8s-master kube-proxy[903]: I0809 17:51:50.556134 903 proxier.go:1067] Stale udp service kube-system/kube-dns:dns -> 10.255.0.2 8月 09 17:51:50 k8s-master kube-proxy[903]: E0809 17:51:50.677871 903 proxier.go:1673] Failed to delete stale service IP 10.255.0.2 connections, error: error deleting connection tracking state for UDP servic...t found in $PATH 8月 09 17:52:19 k8s-master kube-proxy[903]: E0809 17:52:19.609789 903 proxier.go:1952] Failed to delete kube-system/kube-dns:dns endpoint connections, error: error deleting conntrack entries for udp peer {10...t found in $PATH Hint: Some lines were ellipsized, use -l to show in full. 执行下面命令: yum -y install conntrack-tools