3 月 042020
在主机k8s-1上设置主机名并禁用selinux设置
[root@ip-172-31-37-25 ~]# hostnamectl set-hostname k8s-1 [root@ip-172-31-37-25 ~]# sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config [root@ip-172-31-37-25 ~]# init 6
在主机k8s-1上安装docker服务
[root@k8s-1 ~]# yum -y install yum-utils [root@k8s-1 ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo Loaded plugins: fastestmirror adding repo from: https://download.docker.com/linux/centos/docker-ce.repo grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo repo saved to /etc/yum.repos.d/docker-ce.repo [root@k8s-1 ~]#
查看当前docker版本信息
[root@k8s-1 ~]# yum info docker-ce Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: d36uatko69830t.cloudfront.net * extras: d36uatko69830t.cloudfront.net * updates: d36uatko69830t.cloudfront.net docker-ce-stable | 3.5 kB 00:00:00 (1/2): docker-ce-stable/x86_64/primary_db | 40 kB 00:00:00 (2/2): docker-ce-stable/x86_64/updateinfo | 55 B 00:00:00 Available Packages Name : docker-ce Arch : x86_64 Epoch : 3 Version : 19.03.7 Release : 3.el7 Size : 25 M Repo : docker-ce-stable/x86_64 Summary : The open-source application container engine URL : https://www.docker.com License : ASL 2.0 Description : Docker is a product for you to build, ship and run any application as a : lightweight container. : : Docker containers are both hardware-agnostic and platform-agnostic. This means : they can run anywhere, from your laptop to the largest cloud compute instance and : everything in between - and they don't require you to use a particular : language, framework or packaging system. That makes them great building blocks : for deploying and scaling web apps, databases, and backend services without : depending on a particular stack or provider. [root@k8s-1 ~]#
安装docker服务
[root@k8s-1 ~]# yum -y install docker-ce
修改docker启动配置文件
[root@k8s-1 ~]# mkdir -p /etc/docker [root@k8s-1 ~]# cat > /etc/docker/daemon.json <<EOF > { > "exec-opts": ["native.cgroupdriver=systemd"], > "log-driver": "json-file", > "log-opts": { > "max-size": "100m" > }, > "storage-driver": "overlay2", > "storage-opts": [ > "overlay2.override_kernel_check=true" > ] > } > EOF [root@k8s-1 ~]#
注册并启动服务
[root@k8s-1 ~]# mkdir -p /etc/systemd/system/docker.service.d [root@k8s-1 ~]# [root@k8s-1 ~]# systemctl daemon-reload [root@k8s-1 ~]# systemctl enable docker Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service. [root@k8s-1 ~]# systemctl start docker [root@k8s-1 ~]#
修改内核参数
[root@k8s-1 ~]# cat <<EOF > /etc/sysctl.d/k8s.conf > net.bridge.bridge-nf-call-ip6tables = 1 > net.bridge.bridge-nf-call-iptables = 1 > EOF [root@k8s-1 ~]# sysctl --system * Applying /usr/lib/sysctl.d/00-system.conf ... net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 * Applying /usr/lib/sysctl.d/10-default-yama-scope.conf ... kernel.yama.ptrace_scope = 0 * Applying /usr/lib/sysctl.d/50-default.conf ... kernel.sysrq = 16 kernel.core_uses_pid = 1 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.default.promote_secondaries = 1 net.ipv4.conf.all.promote_secondaries = 1 fs.protected_hardlinks = 1 fs.protected_symlinks = 1 * Applying /etc/sysctl.d/99-sysctl.conf ... * Applying /etc/sysctl.d/k8s.conf ... net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 * Applying /etc/sysctl.conf ... [root@k8s-1 ~]#
安装kubernetes仓库并安装服务
[root@k8s-1 ~]# cat <<EOF > /etc/yum.repos.d/kubernetes.repo > [kubernetes] > name=Kubernetes > baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64 > enabled=1 > gpgcheck=1 > repo_gpgcheck=1 > gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg > exclude=kube* > EOF [root@k8s-1 ~]# [root@k8s-1 ~]# yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes [root@k8s-1 ~]# systemctl enable --now kubelet Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service. [root@k8s-1 ~]#
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在主机k8s-2上设置主机名并禁用selinux设置
[root@ip-172-31-45-40 ~]# hostnamectl set-hostname k8s-2 [root@ip-172-31-45-40 ~]# sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config [root@ip-172-31-45-40 ~]# init 6
在主机k8s-2上安装docker服务
[root@k8s-2 ~]# yum -y install yum-utils [root@k8s-2 ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo Loaded plugins: fastestmirror adding repo from: https://download.docker.com/linux/centos/docker-ce.repo grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo repo saved to /etc/yum.repos.d/docker-ce.repo [root@k8s-2 ~]#
安装docker服务
[root@k8s-2 ~]# yum -y install docker-ce
修改docker启动配置文件
[root@k8s-2 ~]# mkdir -p /etc/docker [root@k8s-2 ~]# cat > /etc/docker/daemon.json <<EOF > { > "exec-opts": ["native.cgroupdriver=systemd"], > "log-driver": "json-file", > "log-opts": { > "max-size": "100m" > }, > "storage-driver": "overlay2", > "storage-opts": [ > "overlay2.override_kernel_check=true" > ] > } > EOF [root@k8s-2 ~]#
注册并启动服务
[root@k8s-2 ~]# mkdir -p /etc/systemd/system/docker.service.d [root@k8s-2 ~]# [root@k8s-2 ~]# systemctl daemon-reload [root@k8s-2 ~]# systemctl enable docker Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service. [root@k8s-2 ~]# systemctl start docker [root@k8s-2 ~]#
修改内核参数
[root@k8s-2 ~]# cat <<EOF > /etc/sysctl.d/k8s.conf > net.bridge.bridge-nf-call-ip6tables = 1 > net.bridge.bridge-nf-call-iptables = 1 > EOF [root@k8s-2 ~]# sysctl --system * Applying /usr/lib/sysctl.d/00-system.conf ... net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 * Applying /usr/lib/sysctl.d/10-default-yama-scope.conf ... kernel.yama.ptrace_scope = 0 * Applying /usr/lib/sysctl.d/50-default.conf ... kernel.sysrq = 16 kernel.core_uses_pid = 1 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.default.promote_secondaries = 1 net.ipv4.conf.all.promote_secondaries = 1 fs.protected_hardlinks = 1 fs.protected_symlinks = 1 * Applying /etc/sysctl.d/99-sysctl.conf ... * Applying /etc/sysctl.d/k8s.conf ... net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 * Applying /etc/sysctl.conf ... [root@k8s-2 ~]#
安装kubernetes仓库并安装服务
[root@k8s-2 ~]# cat <<EOF > /etc/yum.repos.d/kubernetes.repo > [kubernetes] > name=Kubernetes > baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64 > enabled=1 > gpgcheck=1 > repo_gpgcheck=1 > gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg > exclude=kube* > EOF [root@k8s-2 ~]# [root@k8s-2 ~]# yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes [root@k8s-2 ~]# systemctl enable --now kubelet Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service. [root@k8s-2 ~]#
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初始化主节点
[root@k8s-1 ~]# kubeadm init --apiserver-advertise-address=172.31.37.25 --pod-network-cidr=10.244.0.0/16 W0304 12:53:01.696504 4233 validation.go:28] Cannot validate kube-proxy config - no validator is available W0304 12:53:01.696701 4233 validation.go:28] Cannot validate kubelet config - no validator is available [init] Using Kubernetes version: v1.17.3 [preflight] Running pre-flight checks [WARNING Hostname]: hostname "k8s-1" could not be reached [WARNING Hostname]: hostname "k8s-1": lookup k8s-1 on 172.31.0.2:53: no such host [preflight] Pulling images required for setting up a Kubernetes cluster [preflight] This might take a minute or two, depending on the speed of your internet connection [preflight] You can also perform this action in beforehand using 'kubeadm config images pull' [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Starting the kubelet [certs] Using certificateDir folder "/etc/kubernetes/pki" [certs] Generating "ca" certificate and key [certs] Generating "apiserver" certificate and key [certs] apiserver serving cert is signed for DNS names [k8s-1 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 172.31.37.25] [certs] Generating "apiserver-kubelet-client" certificate and key [certs] Generating "front-proxy-ca" certificate and key [certs] Generating "front-proxy-client" certificate and key [certs] Generating "etcd/ca" certificate and key [certs] Generating "etcd/server" certificate and key [certs] etcd/server serving cert is signed for DNS names [k8s-1 localhost] and IPs [172.31.37.25 127.0.0.1 ::1] [certs] Generating "etcd/peer" certificate and key [certs] etcd/peer serving cert is signed for DNS names [k8s-1 localhost] and IPs [172.31.37.25 127.0.0.1 ::1] [certs] Generating "etcd/healthcheck-client" certificate and key [certs] Generating "apiserver-etcd-client" certificate and key [certs] Generating "sa" key and public key [kubeconfig] Using kubeconfig folder "/etc/kubernetes" [kubeconfig] Writing "admin.conf" kubeconfig file [kubeconfig] Writing "kubelet.conf" kubeconfig file [kubeconfig] Writing "controller-manager.conf" kubeconfig file [kubeconfig] Writing "scheduler.conf" kubeconfig file [control-plane] Using manifest folder "/etc/kubernetes/manifests" [control-plane] Creating static Pod manifest for "kube-apiserver" [control-plane] Creating static Pod manifest for "kube-controller-manager" W0304 12:53:27.750650 4233 manifests.go:214] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC" [control-plane] Creating static Pod manifest for "kube-scheduler" W0304 12:53:27.751872 4233 manifests.go:214] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC" [etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests" [wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s [apiclient] All control plane components are healthy after 15.504674 seconds [upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace [kubelet] Creating a ConfigMap "kubelet-config-1.17" in namespace kube-system with the configuration for the kubelets in the cluster [upload-certs] Skipping phase. Please see --upload-certs [mark-control-plane] Marking the node k8s-1 as control-plane by adding the label "node-role.kubernetes.io/master=''" [mark-control-plane] Marking the node k8s-1 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule] [bootstrap-token] Using token: w13kyt.okovvot763i4tnbm [bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles [bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials [bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token [bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster [bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace [kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key [addons] Applied essential addon: CoreDNS [addons] Applied essential addon: kube-proxy 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 172.31.37.25:6443 --token w13kyt.okovvot763i4tnbm \ --discovery-token-ca-cert-hash sha256:16a89254e6f2df256954d3dccb24aadbc8ad3f40b3f806cf53d67b715a5284c8 [root@k8s-1 ~]#
配置本地kubectl命令行运行环境
[root@k8s-1 ~]# mkdir $HOME/.kube [root@k8s-1 ~]# cp /etc/kubernetes/admin.conf $HOME/.kube/config [root@k8s-1 ~]#
下载配置文件
[root@k8s-1 ~]# curl -O https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 14416 100 14416 0 0 32134 0 --:--:-- --:--:-- --:--:-- 32250 [root@k8s-1 ~]#
启动集群
[root@k8s-1 ~]# kubectl apply -f kube-flannel.yml podsecuritypolicy.policy/psp.flannel.unprivileged created clusterrole.rbac.authorization.k8s.io/flannel created clusterrolebinding.rbac.authorization.k8s.io/flannel created serviceaccount/flannel created configmap/kube-flannel-cfg created daemonset.apps/kube-flannel-ds-amd64 created daemonset.apps/kube-flannel-ds-arm64 created daemonset.apps/kube-flannel-ds-arm created daemonset.apps/kube-flannel-ds-ppc64le created daemonset.apps/kube-flannel-ds-s390x created [root@k8s-1 ~]#
查看集群状态
[root@k8s-1 ~]# kubectl get cs NAME STATUS MESSAGE ERROR controller-manager Healthy ok scheduler Healthy ok etcd-0 Healthy {"health":"true"} [root@k8s-1 ~]#
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节点k8s-2加入集群
[root@k8s-2 ~]# kubeadm join 172.31.37.25:6443 --token w13kyt.okovvot763i4tnbm \ >--discovery-token-ca-cert-hash sha256:16a89254e6f2df256954d3dccb24aadbc8ad3f40b3f806cf53d67b715a5284c8 W0304 13:00:11.341421 4312 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set. [preflight] Running pre-flight checks [WARNING Hostname]: hostname "k8s-2" could not be reached [WARNING Hostname]: hostname "k8s-2": lookup k8s-2 on 172.31.0.2:53: no such host [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml' [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.17" ConfigMap in the kube-system namespace [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Starting the kubelet [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap... This node has joined the cluster: * Certificate signing request was sent to apiserver and a response was received. * The Kubelet was informed of the new secure connection details. Run 'kubectl get nodes' on the control-plane to see this node join the cluster. [root@k8s-2 ~]#
在主节点k8s-1查看集群节点状态
[root@k8s-1 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION k8s-1 Ready master 7m58s v1.17.3 k8s-2 Ready <none> 86s v1.17.3 [root@k8s-1 ~]#