目录
2 安装kubelet
2.1 环境准备
#关闭SElinux $ setenforce 0 $ sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config #关闭防火墙 $ systemctl stop firewalld $ systemctl disable --now firewalld #设置iptables(略) #安装kubelet kubeadm kubectl $ yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes #开机启动kubelet $ systemctl enable --now kubelet
2.2 设置国内的源
ps: master、node节点都需要安装kubelet kubeadm kubectl。
官方的源是packages.cloud.google.com，国内访问不了,因此使用阿里云的源
$ cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
2.3 重要的设置
确认/etc/hosts(kub1和kub2时是自己写的,也可以写node1、node2之类,localhost不能删)
$ cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 kub1 192.168.15.174 kub2 192.168.15.175
创建/etc/sysctl.d/k8s.conf文件
$ cat <<EOF > /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 net.ipv4.ip_forward = 1 EOF
安装必要组件
$ yum install -y bridge-utils.x86_64 $ yum install ipvsadm
使配置生效
$ modprobe br_netfilter $ sysctl -p /etc/sysctl.d/k8s.conf $ sysctl --system
关闭swap & 取消开机挂载swap
$ swapoff -a && sysctl -w vm.swappiness=0 $ sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab
安装必要的内核模块
$ cat > /etc/sysconfig/modules/ipvs.modules <<EOF #!/bin/bash modprobe -- ip_vs modprobe -- ip_vs_rr modprobe -- ip_vs_wrr modprobe -- ip_vs_sh modprobe -- nf_conntrack_ipv4 EOF $ chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4
modprobe之后可以用lsmod查看是否生效
2.4 获取镜像
列出需要的镜像
$ kubeadm config images list W0809 11:32:51.518614 18214 version.go:98] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://dl.k8s.io/release/stable-1.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers) W0809 11:32:51.519080 18214 version.go:99] falling back to the local client version: v1.15.2 k8s.gcr.io/kube-apiserver:v1.15.2 k8s.gcr.io/kube-controller-manager:v1.15.2 k8s.gcr.io/kube-scheduler:v1.15.2 k8s.gcr.io/kube-proxy:v1.15.2 k8s.gcr.io/pause:3.1 k8s.gcr.io/etcd:3.3.10 k8s.gcr.io/coredns:1.3.1
说明：上段中提示连不上dl.k8s.io/：
我们fq访问一下：https://storage.googleapis.com/kubernetes-release/release/stable-1.txt发现也是:v1.15.2
### 从亚马逊获取镜像(国内可以访问,而且速度不慢) docker pull gcr.azk8s.cn/google_containers/kube-apiserver:v1.15.2 docker pull gcr.azk8s.cn/google_containers/kube-controller-manager:v1.15.2 docker pull gcr.azk8s.cn/google_containers/kube-scheduler:v1.15.2 docker pull gcr.azk8s.cn/google_containers/kube-proxy:v1.15.2 docker pull gcr.azk8s.cn/google_containers/pause:3.1 docker pull gcr.azk8s.cn/google_containers/etcd:3.3.10 docker pull gcr.azk8s.cn/google_containers/coredns:1.3.1 # 将镜像打Tag成目标镜像 docker tag gcr.azk8s.cn/google_containers/kube-proxy:v1.15.2 k8s.gcr.io/kube-proxy:v1.15.2 docker tag gcr.azk8s.cn/google_containers/kube-controller-manager:v1.15.2 k8s.gcr.io/kube-controller-manager:v1.15.2 docker tag gcr.azk8s.cn/google_containers/kube-scheduler:v1.15.2 k8s.gcr.io/kube-scheduler:v1.15.2 docker tag gcr.azk8s.cn/google_containers/kube-apiserver:v1.15.2 k8s.gcr.io/kube-apiserver:v1.15.2 docker tag gcr.azk8s.cn/google_containers/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1 docker tag gcr.azk8s.cn/google_containers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10 docker tag gcr.azk8s.cn/google_containers/pause:3.1 k8s.gcr.io/pause:3.1 # 删除下载的镜像 docker rmi gcr.azk8s.cn/google_containers/kube-apiserver:v1.15.2 docker rmi gcr.azk8s.cn/google_containers/kube-controller-manager:v1.15.2 docker rmi gcr.azk8s.cn/google_containers/kube-scheduler:v1.15.2 docker rmi gcr.azk8s.cn/google_containers/kube-proxy:v1.15.2 docker rmi gcr.azk8s.cn/google_containers/pause:3.1 docker rmi gcr.azk8s.cn/google_containers/etcd:3.3.10 docker rmi gcr.azk8s.cn/google_containers/coredns:1.3.1
2.5 使用kubeadm init初始化集群
查看集群的默认配置
$ kubeadm config print init-defaults 结果(略)
使用kubeadm默认配置初始化的集群，会在master节点打上node-role.kubernetes.io/master:NoSchedule的污点，阻止master节点接受调度运行工作负载。这里测试环境只有两个节点，所以将这个taint修改为node-role.kubernetes.io/master:PreferNoSchedule。
根据上面的结果编辑yaml文件
$ vi kubeadm.yaml
apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: 192.168.15.174
bindPort: 6443
nodeRegistration:
taints:
- effect: PreferNoSchedule
key: node-role.kubernetes.io/master
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.15.2
networking:
podSubnet: 10.244.0.0/16
初始化
$ kubeadm init --config kubeadm.yaml --ignore-preflight-errors=Swap
[init] Using Kubernetes version: v1.15.2
[preflight] Running pre-flight checks
[WARNING Hostname]: hostname "kub1" could not be reached
[WARNING Hostname]: hostname "kub1": lookup kub1 on 114.114.114.114:53: 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] Activating the kubelet service
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [kub1 localhost] and IPs [192.168.15.174 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [kub1 localhost] and IPs [192.168.15.174 127.0.0.1 ::1]
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [kub1 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.15.174]
[certs] Generating "apiserver-kubelet-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"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[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 39.505847 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.15" in namespace kube-system with the configuration for the kubelets in the cluster
[kubelet-check] Initial timeout of 40s passed.
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node kub1 as control-plane by adding the label "node-role.kubernetes.io/master=''"
[mark-control-plane] Marking the node kub1 as control-plane by adding the taints [node-role.kubernetes.io/master:PreferNoSchedule]
[bootstrap-token] Using token: xzmioa.hnr8r2qrghsr9xje
[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
[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 192.168.15.174:6443 --token xzmioa.hnr8r2qrghsr9xje \
--discovery-token-ca-cert-hash sha256:779d4c9330409f67b584f36baf2e882c42ac9d6c9e2c3765904c341fb3b89d10
按提示设置
$ mkdir -p $HOME/.kube $ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config $ sudo chown $(id -u):$(id -g) $HOME/.kube/config
查看一下集群状态，确认个组件都处于healthy状态：
$ kubectl get cs
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health":"true"}
如果kubeadm init不成功,执行下面的命令重置
$ kubeadm reset $ ifconfig cni0 down $ ip link delete cni0 $ ifconfig flannel.1 down $ ip link delete flannel.1 $ rm -rf /var/lib/cni/
2.6 安装Pod Network
$ curl -O https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml $ kubectl apply -f kube-flannel.yml clusterrole.rbac.authorization.k8s.io/flannel created clusterrolebinding.rbac.authorization.k8s.io/flannel created serviceaccount/flannel created configmap/kube-flannel-cfg created daemonset.extensions/kube-flannel-ds-amd64 created daemonset.extensions/kube-flannel-ds-arm64 created daemonset.extensions/kube-flannel-ds-arm created daemonset.extensions/kube-flannel-ds-ppc64le created daemonset.extensions/kube-flannel-ds-s390x created
如果node有多个网卡,需编辑kube-flannel.yml,用--iface指定网卡
......
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.11.0-amd64
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
- --iface=eth1
......
查看状态(必须保证所有pod都Running)
$ kubectl get pod -n kube-system NAME READY STATUS RESTARTS AGE coredns-5c98db65d4-dr8lf 1/1 Running 0 52m coredns-5c98db65d4-lp8dg 1/1 Running 0 52m etcd-node1 1/1 Running 0 51m kube-apiserver-node1 1/1 Running 0 51m kube-controller-manager-node1 1/1 Running 0 51m kube-flannel-ds-amd64-mm296 1/1 Running 0 44s kube-proxy-kchkf 1/1 Running 0 52m kube-scheduler-node1 1/1 Running 0 51m
2.7 测试集群DNS是否可用
确保coredns运行正常后,启动一个虚拟机测试
$ kubectl run curl --image=radial/busyboxplus:curl -it kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead. If you don't see a command prompt, try pressing enter. [ root@curl-5cc7b478b6-r997p:/ ]$ nslookup kubernetes.default Server: 10.96.0.10 Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local Name: kubernetes.default Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
nslookup kubernetes.default是在pod中运行的。
2.8 向集群中添加Node节点
在其他节点上执行kubeadm join(这个命令就是主节点kubeadm init打印出来的)
$ kubeadm join 192.168.15.174:6443 --token xzmioa.hnr8r2qrghsr9xje \
--discovery-token-ca-cert-hash sha256:779d4c9330409f67b584f36baf2e882c42ac9d6c9e2c3765904c341fb3b89d10
查看集群中所有节点：
$ kubectl get node NAME STATUS ROLES AGE VERSION kub1 Ready master 5h51m v1.15.2 kub2 Ready <none> 5h44m v1.15.2