k8s 1.9 安装

测试环境

主机	系统
master	CentOS 7.3
node	CentOS 7.3

2.关闭selinux（所有节点都执行）

[root@matser ~]# getenforce
Disabled

3.关闭swap分区（所有节点都执行）

[root@matser ~]# swapoff -a
[root@matser ~]# free -h
              total        used        free      shared  buff/cache   available
Mem:           1.8G        502M        117M        2.0M        1.2G        1.1G
Swap:            0B          0B          0B

4.设置sshd   keepalive（所有节点都执行）

echo "ClientAliveInterval 10" >> /etc/ssh/sshd_config
echo "TCPKeepAlive yes" >> /etc/ssh/sshd_config
systemctl restart sshd.service

5.安装docker（所有节点都执行）

 yum install -y docker
systemctl enable docker && systemctl start docker

6.设置路由（所有节点都执行）

cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables =
net.bridge.bridge-nf-call-iptables =
EOF
sysctl --system

7.安装kubeadm, kubelet和kubectl（所有节点都执行）

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=
gpgcheck=
repo_gpgcheck=
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
 
yum install -y kubelet kubeadm kubectl
 systemctl enable kubelet && systemctl start kubelet

8.初始化指定kubernetes版本，并设置一下pod-network-cidr（master）

 kubeadm init --kubernetes-version=v1.9.0 --pod-network-cidr=10.244.0.0/16
 

[root@matser ~]# kubeadm init --kubernetes-version=v1.9.0 --pod-network-cidr=10.244.0.0/16
[init] Using Kubernetes version: v1.9.0
[init] Using Authorization modes: [Node RBAC]
[preflight] Running pre-flight checks.
[WARNING Hostname]: hostname "matser" could not be reached
[WARNING Hostname]: hostname "matser" lookup matser on 100.100.2.136:53: no such host
[WARNING FileExisting-crictl]: crictl not found in system path
[certificates] Generated ca certificate and key.
[certificates] Generated apiserver certificate and key.
[certificates] apiserver serving cert is signed for DNS names [matser kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 172.31.1.1]
[certificates] Generated apiserver-kubelet-client certificate and key.
[certificates] Generated sa key and public key.
[certificates] Generated front-proxy-ca certificate and key.
[certificates] Generated front-proxy-client certificate and key.
[certificates] Valid certificates and keys now exist in "/etc/kubernetes/pki"
[kubeconfig] Wrote KubeConfig file to disk: "admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "controller-manager.conf"
[kubeconfig] Wrote KubeConfig file to disk: "scheduler.conf"
[controlplane] Wrote Static Pod manifest for component kube-apiserver to "/etc/kubernetes/manifests/kube-apiserver.yaml"
[controlplane] Wrote Static Pod manifest for component kube-controller-manager to "/etc/kubernetes/manifests/kube-controller-manager.yaml"
[controlplane] Wrote Static Pod manifest for component kube-scheduler to "/etc/kubernetes/manifests/kube-scheduler.yaml"
[etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/manifests/etcd.yaml"
[init] Waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests".
[init] This might take a minute or longer if the control plane images have to be pulled.
[apiclient] All control plane components are healthy after 50.001758 seconds
[uploadconfig] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[markmaster] Will mark node matser as master by adding a label and a taint
[markmaster] Master matser tainted and labelled with key/value: node-role.kubernetes.io/master=""
[bootstraptoken] Using token: e03777.05d943f3d7c05ff1
[bootstraptoken] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstraptoken] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstraptoken] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstraptoken] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: kube-dns
[addons] Applied essential addon: kube-proxy

Your Kubernetes master 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/

You can now join any number of machines by running the following on each node
as root:

kubeadm join --token e03777.05d943f3d7c05ff1 172.31.1.1:6443 --discovery-token-ca-cert-hash sha256:40abf04eaea9097377b2b3def894a4a2540a353ac76bc918ca6c18549193f45c

8.设置变量（master）

 export KUBECONFIG=/etc/kubernetes/admin.conf
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

9.配置网络Flannel（master）

 kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml
 
##查看
[root@matser ~]# kubectl get pods --all-namespaces
NAMESPACE     NAME                             READY     STATUS    RESTARTS   AGE
default       nginx                            /       Running             15s
kube-system   etcd-matser                      /       Running             4m
kube-system   kube-apiserver-matser            /       Running             3m
kube-system   kube-controller-manager-matser   /       Running             4m
kube-system   kube-dns-6f4fd4bdf-lrt5x         /       Running             4m
kube-system   kube-flannel-ds-9rfcs            /       Running             3m
kube-system   kube-flannel-ds-fh2pw            /       Running             1m
kube-system   kube-proxy-czxhz                 /       Running             1m
kube-system   kube-proxy-t9php                 /       Running             4m
kube-system   kube-scheduler-matser            /       Running             3m

10.加入nodes（node端）

在node端执行

[root@node ~]#  kubeadm join --token e03777.05d943f3d7c05ff1 172.31.1.1: --discovery-token-ca-cert-hash sha256:40abf04eaea9097377b2b3def894a4a2540a353ac76bc918ca6c18549193f45c
[preflight] Running pre-flight checks.
    [WARNING FileExisting-crictl]: crictl not found in system path
[discovery] Trying to connect to API Server "172.31.1.1:6443"
[discovery] Created cluster-info discovery client, requesting info from "https://172.31.1.1:6443"
[discovery] Requesting info from "https://172.31.1.1:6443" again to validate TLS against the pinned public key
[discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server "172.31.1.1:6443"
[discovery] Successfully established connection with API Server "172.31.1.1:6443"
 
This node has joined the cluster:
* Certificate signing request was sent to master and a response
  was received.
* The Kubelet was informed of the new secure connection details.
 
Run 'kubectl get nodes' on the master to see this node join the cluster.

11.master端查看

[root@matser ~]# kubectl  get node
NAME      STATUS    ROLES     AGE       VERSION
matser    Ready     master    23m       v1.9.4
node      Ready     <none>    19m       v1.9.4