Kubeadm安装Kubernetes环境总结:
Kubernetes服务架构采用Mater-Slave，不考虑高可用，一般采用一个Master节点和多个Slave节点，这里采用1Master和2Slave节点
首先这里采用Vmware来安装三台Linux操作系统，网络设置为NAT模式
Master和Slave均要操作
1.配置好各节点hosts文件
K8smaster 192.168.3.3
K8snode1 192.168.3.4
K8snode2 192.168.3.5
2.关闭系统防火墙
Systemctl stop firewalld.service
Systemctl disable firewalld.service
3.关闭Selinux
Vim /etc/selinux/config
SELINUX=disabled
4.关闭swap
Swapoff -a
5.配置系统内核参数使流过网桥的流量也进入iptables/netfilter框架中
Vim 在/etc/sysctl.conf中添加以下配置：
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
sysctl –p
重启
6.配置阿里K8S YUM源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
EOF
yum -y install epel-release
yum clean all
yum makecache
7.安装kubeadm和相关工具包
yum -y install docker kubelet kubeadm kubectl kubernetes-cni
8.启动Docker与kubelet服务
systemctl enable docker && systemctl start docker
systemctl enable kubelet && systemctl start kubelet
9.配置加速镜像
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://99b9e5v9.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
10.下载K8S相关镜像
#!/bin/bash
images=(kube-proxy-amd64:v1.10.0 kube-scheduler-amd64:v1.10.0 kube-controller-manager-amd64:v1.10.0 kube-apiserver-amd64:v1.10.0
etcd-amd64:3.1.12 pause-amd64:3.1 kubernetes-dashboard-amd64:v1.8.3 k8s-dns-sidecar-amd64:1.14.8 k8s-dns-kube-dns-amd64:1.14.8
k8s-dns-dnsmasq-nanny-amd64:1.14.8)
for imageName in ${images[@]} ; do
docker pull keveon/$imageName
docker tag keveon/$imageName k8s.gcr.io/$imageName
docker rmi keveon/$imageName
done
11.master节点操作如下
初始化安装K8S Master
kubeadm init --kubernetes-version=v1.10.0 --pod-network-cidr=10.244.0.0/16
配置kubectl认证信息
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
安装flannel网络
mkdir -p /etc/cni/net.d/
cat <<EOF> /etc/cni/net.d/10-flannel.conf
{
“name”: “cbr0”,
“type”: “flannel”,
“delegate”: {
“isDefaultGateway”: true
}
}
EOF
mkdir /usr/share/oci-umount/oci-umount.d -p
mkdir /run/flannel/
cat <<EOF> /run/flannel/subnet.env
FLANNEL_NETWORK=10.244.0.0/16
FLANNEL_SUBNET=10.244.1.0/24
FLANNEL_MTU=1450
FLANNEL_IPMASQ=true
EOF
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml
12.Node节点：
执行1-10步骤
加入master节点
kubeadm join 192.168.3.3:6443 --token jw07fw.108yecqmxs2vpxp8 --discovery-token-ca-cert-hash sha256:a8af61e79dfdecae8055fc82ece3547655d9aa57e34cc83f6f3fb4b54711f09f
其他操作
master重启
kubeadm reset
swapoff –a
kubeadm init --kubernetes-version=v1.10.0 --pod-network-cidr=10.244.0.0/16
node重启
kubeadm reset
swapoff –a
kubeadm join
kubectl管理：
# 查看节点状态
kubectl get nodes
kubectl describe node k8snode1
# 查看pods状态
kubectl get pods --all-namespaces
# 查看K8S集群状态
kubectl get cs
DNS服务搭建
配置好各主机/etc/hosts
验证DNS服务：
kubectl run curl --image=radial/busyboxplus:curl -i --tty
nslookup kubernetes.default
kubectl delete deploy curl