kubeadm安装单机版kubernetes

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 2020年7月1日11:34:34 评论 909 11221字阅读37分24秒
  • 关闭防火墙
[root@iZ2zei14p015t8wkktdhn2Z ~]#  systemctl stop firewalld
[root@iZ2zei14p015t8wkktdhn2Z ~]# systemctl disable firewalld
  • 关闭selinux
[root@iZ2zei14p015t8wkktdhn2Z ~]# sed -i 's/enforcing/disabled/' /etc/selinux/config 
[root@iZ2zei14p015t8wkktdhn2Z ~]# setenforce 0
setenforce: SELinux is disabled
  • 关闭swap
[root@iZ2zei14p015t8wkktdhn2Z ~]# swapoff -a 
[root@iZ2zei14p015t8wkktdhn2Z ~]# vim /etc/fstab  注释或者删掉里面的swap
  • 将桥接的IPv4流量传递到iptables的链
cat <<EOF | sudo tee /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
sysctl --system
modprobe br_netfilter
  • 安装Docker
[root@iZ2zei14p015t8wkktdhn3Z ~]# wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
[root@iZ2zei14p015t8wkktdhn3Z ~]#  yum -y install docker-ce
[root@iZ2zei14p015t8wkktdhn3Z ~]# curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
[root@iZ2zei14p015t8wkktdhn3Z ~]# systemctl enable docker && systemctl start docker
[root@iZ2zei14p015t8wkktdhn2Z ~]# docker --version
Docker version 19.03.8, build afacb8b
  • 添加阿里云YUM软件源
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

安装kubeadm，kubelet和kubectl

  • 安装
[root@iZ2ze9lpuyxnf8j4d15vkgZ ~]#  yum install -y kubelet-1.18.3 kubeadm-1.18.3 kubectl-1.18.3
  • docker的Cgroup Driver和kubelet的Cgroup Driver一致
[root@iZ2ze9lpuyxnf8j4d15vkgZ ~]# vim /usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd --exec-opt native.cgroupdriver=systemd -H fd:// --containerd=/run/containerd/containerd.sock
[root@iZ2ze9lpuyxnf8j4d15vkgZ ~]# systemctl daemon-reload
[root@iZ2ze9lpuyxnf8j4d15vkgZ ~]# systemctl restart docker
[root@iZ2ze9lpuyxnf8j4d15vkgZ ~]# docker info | grep Cgroup
 Cgroup Driver: systemd
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# systemctl enable kubelet.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
  • 初始化
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]#
kubeadm init \
--apiserver-advertise-address=10.10.1.0 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.18.3 \
--service-cidr=10.1.0.0/16 \
--pod-network-cidr=10.244.0.0/16

W0701 13:48:17.371453    2194 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
[init] Using Kubernetes version: v1.18.3
[preflight] Running pre-flight checks
[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 [iz2ze2jlupmjlwwfuyg30gz kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.1.0.1 10.10.1.0]
[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 [iz2ze2jlupmjlwwfuyg30gz localhost] and IPs [10.10.1.0 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [iz2ze2jlupmjlwwfuyg30gz localhost] and IPs [10.10.1.0 127.0.0.1 ::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"
W0701 13:48:49.219224    2194 manifests.go:225] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
[control-plane] Creating static Pod manifest for "kube-scheduler"
W0701 13:48:49.220708    2194 manifests.go:225] 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 21.501457 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.18" 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 iz2ze2jlupmjlwwfuyg30gz as control-plane by adding the label "node-role.kubernetes.io/master=''"
[mark-control-plane] Marking the node iz2ze2jlupmjlwwfuyg30gz as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: njjyan.y1c6mpmr2v5wz319
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes
[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 10.10.1.0:6443 --token njjyan.y1c6mpmr2v5wz319 \
    --discovery-token-ca-cert-hash sha256:25cbaa4ad6e4f37f2d56868e6fe25120063530387d31b4b3d29de78e3b8bc198
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# mkdir -p $HOME/.kube
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]#  sudo chown $(id -u):$(id -g) $HOME/.kube/config
  • 单机版kubernetes为了运行Pod.需要删除主机上的Train.允许master执行Pod.
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl taint nodes --all node-role.kubernetes.io/master-
node/iz2ze2jlupmjlwwfuyg30gz untainted
  • 至此，单机版的Kubernetes就搭建完成了。

验证master节点信息

[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok
scheduler            Healthy   ok
etcd-0               Healthy   {"health":"true"}
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl get node
NAME                      STATUS     ROLES    AGE     VERSION
iz2ze2jlupmjlwwfuyg30gz   NotReady   master   2m44s   v1.18.3
  • 安装Pod网络插件
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# wget  https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# 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

安装完成后使用 kubectl get pods 命令可以查看到我们集群中的组件运行状态，如果都是Running 状态的话，那么恭喜你，你的 单节点安装成功了。

[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl get pods --all-namespaces
NAMESPACE     NAME                                              READY   STATUS    RESTARTS   AGE
kube-system   coredns-7ff77c879f-2qc68                          1/1     Running   0          12m
kube-system   coredns-7ff77c879f-khbjf                          1/1     Running   0          12m
kube-system   etcd-iz2ze2jlupmjlwwfuyg30gz                      1/1     Running   0          12m
kube-system   kube-apiserver-iz2ze2jlupmjlwwfuyg30gz            1/1     Running   0          12m
kube-system   kube-controller-manager-iz2ze2jlupmjlwwfuyg30gz   1/1     Running   0          12m
kube-system   kube-flannel-ds-amd64-dfmck                       1/1     Running   0          2m15s
kube-system   kube-proxy-tbqrx                                  1/1     Running   0          12m
kube-system   kube-scheduler-iz2ze2jlupmjlwwfuyg30gz            1/1     Running   0          12m
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl get pods -n kube-system
NAME                                              READY   STATUS    RESTARTS   AGE
coredns-7ff77c879f-2qc68                          1/1     Running   0          12m
coredns-7ff77c879f-khbjf                          1/1     Running   0          12m
etcd-iz2ze2jlupmjlwwfuyg30gz                      1/1     Running   0          12m
kube-apiserver-iz2ze2jlupmjlwwfuyg30gz            1/1     Running   0          12m
kube-controller-manager-iz2ze2jlupmjlwwfuyg30gz   1/1     Running   0          12m
kube-flannel-ds-amd64-dfmck                       1/1     Running   0          2m25s
kube-proxy-tbqrx                                  1/1     Running   0          12m
kube-scheduler-iz2ze2jlupmjlwwfuyg30gz            1/1     Running   0          12m
  • 在Kubernetes集群中创建一个pod，验证是否正常运行
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]#  kubectl create deployment nginx --image=nginx
deployment.apps/nginx created
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl expose deployment nginx --port=80 --type=NodePort
service/nginx exposed
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl get pod,svc
NAME                        READY   STATUS    RESTARTS   AGE
pod/nginx                   1/1     Running   0          47s
pod/nginx-f89759699-c4dfv   1/1     Running   0          21s

NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP   10.1.0.1     <none>        443/TCP        18m
service/nginx        NodePort    10.1.11.16   <none>        80:32693/TCP   11s
  • 验证，输入节点IP加暴露的端口即可
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# curl 10.10.1.0:32693
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a rel="external nofollow" target="_blank" href="https://www.centoscn.vip/wp-content/themes/begin/go.php?url=aHR0cDovL25naW54Lm9yZy8=">nginx.org</a>.<br/>
Commercial support is available at
<a rel="external nofollow" target="_blank" href="https://www.centoscn.vip/wp-content/themes/begin/go.php?url=aHR0cDovL25naW54LmNvbS8=">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

kubeadm安装单机版kubernetes

  • 扩容副本
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl scale deployment nginx --replicas=3
deployment.apps/nginx scaled
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl get pod,svc
NAME                        READY   STATUS    RESTARTS   AGE
pod/nginx                   1/1     Running   0          3m41s
pod/nginx-f89759699-c4dfv   1/1     Running   0          3m15s
pod/nginx-f89759699-sz889   1/1     Running   0          10s
pod/nginx-f89759699-vhwd5   1/1     Running   0          10s

NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP   10.1.0.1     <none>        443/TCP        21m
service/nginx        NodePort    10.1.11.16   <none>        80:32693/TCP   3m5s
  • 查看pod的详细信息
[root@iZ2ze2jlupmjlwwfuyg30gZ ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 4m13s 10.244.0.6 iz2ze2jlupmjlwwfuyg30gz <none> <none>
nginx-f89759699-c4dfv 1/1 Running 0 3m47s 10.244.0.7 iz2ze2jlupmjlwwfuyg30gz <none> <none>
nginx-f89759699-sz889 1/1 Running 0 42s 10.244.0.9 iz2ze2jlupmjlwwfuyg30gz <none> <none>
nginx-f89759699-vhwd5 1/1 Running 0 42s 10.244.0.8 iz2ze2jlupmjlwwfuyg30gz <none> <none>
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  • 本文由 发表于 2020年7月1日11:34:34
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