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 ~]#

—-

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 ~]#

—-

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 ~]# 

—-

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 ~]# 

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