k8s 集群搭建 - 爱码网

Docker k8s集群的搭建部署

1.需要下载的文件和安装包如下：

k8s 集群搭建

2.在server1/2上安装rpm包：

kubeadm-1.12.2-0.x86_64.rpm kubectl-1.12.2-0.x86_64.rpm
kubelet-1.12.2-0.x86_64.rpm kubernetes-cni-0.6.0-0.x86_64.rpm
cri-tools-1.12.0-0.x86_64.rpm
[[email protected] k8s]# yum install -y kubeadm-1.12.2-0.x86_64.rpm kubectl-1.12.2-0.x86_64.rpm kubelet-1.12.2-0.x86_64.rpm kubernetes-cni-0.6.0-0.x86_64.rpm cri-tools-1.12.0-0.x86_64.rpm
systemctl start kubelet.service #开启服务
[[email protected] k8s]# systemctl enable kubelet.service

3.关闭swap分区

[[email protected] k8s]# swapoff -a
[[email protected] k8s]# vim /etc/fstab
[[email protected] k8s]# systemctl enable kubelet.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /etc/systemd/system/kubelet.service.

4.列出需要加载的镜像

kubeadm config images list

5.加载镜像：

[[email protected] k8s]# docker load -i kube-apiserver.tar
[[email protected] k8s]# docker load -i kube-controller-manager.tar
[[email protected] k8s]# docker load -i kube-proxy.tar
[[email protected] k8s]# docker load -i pause.tar
[[email protected] k8s]# docker load -i etcd.tar
[[email protected] k8s]# docker load -i coredns.tar
[[email protected] k8s]# docker load -i kube-scheduler.tar
[[email protected] k8s]# docker load -i flannel.tar

k8s 集群搭建

6.初始化集群

在server1:

vim kube-flannel.yml

k8s 集群搭建

kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=172.25.60.1
此时若报错：

k8s 集群搭建

解决办法：

[[email protected] k8s]# sysctl -a | grep net.*iptables
net.bridge.bridge-nf-call-iptables = 0
[[email protected] k8s]# sysctl -w net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-iptables = 1
显示下面的信息，表示集群初始化成功:

k8s 集群搭建

7.建立k8s 用户设置环境

[[email protected] k8s]# useradd k8s
[[email protected] k8s]# chmod u+w /etc/sudoers
[[email protected] k8s]# vim /etc/sudoers
92 k8s ALL=(ALL) NOPASSWD: ALL
[[email protected] k8s]# su - k8s #切换到普通用户进行下面的操作
Last login: Fri May 31 09:06:50 CST 2019 on pts/0
[[email protected] ~]$ mkdir -p $HOME/.kube [[email protected] ~]$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config [[email protected] ~]$ sudo chown $(id -u):$ (id -g) $HOME/.kube/config 解决kubectl补不全的问题: [[email protected] ~]$ echo “source <(kubectl completion bash)” >> ./.bashrc
[[email protected] ~]$ logout
[[email protected] k8s]# su - k8s
Last login: Fri May 31 09:18:23 CST 2019 on pts/0

8.server1:

将kube-flannel.yml文件发送到/home/k8s目录下。因为kube-flannel.yml文件原来的/root/k8s目录下，普通用户k8s无法访问。并根据初始化集群的提示，继续操作

[[email protected] ~]$ logout
[[email protected] k8s]# cp kube-flannel.yml /home/k8s/
[[email protected] k8s]# su - k8s
Last login: Fri May 31 09:21:08 CST 2019 on pts/0
[[email protected] ~]$ kubectl apply -f kube-flannel.yml

查看运行的容器:

sudo docker ps

9.根据master节点初始化集群的结果提示，将server2节点加入集群。
k8s 集群搭建

[[email protected] ~]# modprobe ip_vs_sh
[[email protected] ~]# modprobe ip_vs_wrr
[[email protected] ~]# kubeadm join 172.25.60.1:6443 --token wggnuo.9npa1y0i4ahe1p42 --discovery-token-ca-cert-hash sha256:fb05dc0956a3e1d897a3113742498255e8d05c1c8d20c2c5479d2d658a97b9a8

查看server2节点上运行的容器:
[[email protected] ~]# docker ps

9.在server1上查看节点状态是否为ready：

[[email protected] ~]$ kubectl get nodes

k8s 集群搭建
查看所有namespace下的pod：

[[email protected] ~]$ kubectl get pod --all-namespaces

k8s 集群搭建