前言
- 在ＫＶＭ环境下安装ｃｅｎｔｏｓ７
- 修改配置
- 安装k8s
- 基本情况
- k8smaster 192.168.100.10
- k8snote1 192.168.100.11
- k8snote2 192.168.100.12
修改配置
关闭防火墙
systemctl stop firewalld
systemctl enable firewalld
关闭selinux
# 临时关闭
setenforce 0
# 永久关闭
sed -i '7cSELINUX=disabled' /etc/selinux/config
设置IP地址
# 所有节点设置hostname
hostnamectl set-hostname k8smaster
# 设置地址
[root@k8smaster ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens3
TYPE=Ethernet
BOOTPROTO=static
NAME=ens3
DEVICE=ens3
ONBOOT=yes
IPADDR=192.168.100.10
GATEWAY=192.168.100.1
NETMASK=255.255.255.0
DNS1=114.114.114.114
DNS2=8.8.8.8
注释最后一行，禁止swap
#
# /etc/fstab
# Created by anaconda on Fri Oct 18 03:53:32 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root / xfs defaults 0 0
UUID=69dd6e3a-7b95-4c70-a60c-3bdfbf974f30 /boot xfs defaults 0 0
#/dev/mapper/centos-swap swap swap defaults 0 0
# 关闭swap
swapoff -a && sysctl -w vm.swappiness=0
所有节点都需要安装的软件包
yum -y install vim lsof telnet net-tools
所有节点安装软件包
安装docker
安装k8s
所有节点安装
- 配置yum的k8s.repo
vim /etc/yum.repos.d/k8s.repo
[k8s]
name=k8s
enabled=1
gpgcheck=0
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
- 安装kubelet kubeadm kubectl -y并实现开机自启
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet
- 修改hosts
vim /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.100.10 k8smaster
192.168.100.11 k8snode1
192.168.100.12 k8snode2
- 修改iptables
echo "1" >/proc/sys/net/bridge/bridge-nf-call-iptables
master节点安装
初始化master
# 初始化master
kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.16.2 --apiserver-advertise-address 192.168.100.10 --pod-network-cidr=10.244.0.0/16 --v=5
-
成功# token信息很重要
image.png
-
报错:版本过低
image.png
-
初始化失败清楚环境信息
kubeadm reset
ifconfig cni0 down
ip link delete cni0
ifconfig flannel.1 down
ip link delete flannel.1rm -rf /var/lib/cni/
rm -rf /var/lib/etcd/*
配置master
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
bash 自动补全
echo "source <(kubectl completion bash)" >> ~/.bashrc
检测
# 检测是否安装成功
[root@k8smaster etc]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8smaster NotReady master 7m37s v1.16.2
安装pod网络，
# 安装pod网络
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
# 重启
systemctl restart kubelet
下载成功后，status为ready
# 查看状态
[root@k8smaster etc]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8smaster Ready master 12m v1.16.2
# 查看pods
kubectl get pods -n kube-system
node节点加入k8s
记得token加入节点
# token上面初始化时候得到的
kubeadm join 192.168.100.10:6443 --token qvti7j.7hhybjfb803ryusb \
--discovery-token-ca-cert-hash sha256:c14951ca3e5e6511736e13c92124464bfa47dca01eff001b17f4ae12c0bbexxxx
忘记token加入节点
- master节点获取
# 获取toekn
kubeadm token list
# 获取sha256
openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'
- node节点加入
systemctl stop kubelet
rm -rf /etc/kubernetes/*
- 加入集群
kubeadm join 192.168.100.10:6443 --token qvti7j.7hhybjfb803ryusb \
--discovery-token-ca-cert-hash sha256:c14951ca3e5e6511736e13c92124464bfa47dca01eff001b17f4ae12c0bbexxxx
基础操作
- 查看node
kubectl get nodes
- 查看namespaces
kubectl get ns
- 查看指定namespaces中的pod
kubectl get po -n kube-system
kubectl get po -n kube-system -o wide
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