云原生·Kubernetes02——Kubeadm集群部署

                                目录

一、集群规划

二、基础安装（所有机器）

1、SSH主机免密

2、host文件解析

3、安装依赖包

4、关闭防火墙

5、关闭swap以及selinux

6、调整内核参数

7、设置时区

8、降低环境资源，关闭邮件服务

三、环境部署（所有节点）

1、Kube-proxy开启ipvs的前置条件

2、部署k8s

3、部署calico网络

---

一、集群规划

主机名	IP	备注
node1	192.168.100.1	master
node2	192.168.100.2	node1
node3	192.168.100.3	node2

二、基础安装（所有机器）

1、SSH主机免密

[root@node1 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:/mKLWNjKS7Dsuyp7O7FlZ7yWE+Z/92LAEBNaQ/Tl4nk root@node1
The key's randomart image is:
+---[RSA 2048]----+
|       o*.  .    |
|       ooo o     |
|      .  oo .    |
|        .. o     |
|  .  .  Soo E    |
| ..ooo*.  o.     |
|  o=o=o+.  .     |
|..+o +*.o.. +    |
|++===o.+o+.o o.  |
+----[SHA256]-----+

##拷贝公钥（需要给本机以及其他机器也发一份）:
[root@node1 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub node1

##验证:
[root@node1 ~]# ssh node3
Last login: Thu Jun 10 22:58:16 2021 from 192.168.100.254

2、host文件解析

vim /etc/hosts
192.168.100.1 node1
192.168.100.2 node2
192.168.100.3 node3

3、安装依赖包

[root@node1 ~]# yum -y install conntrack ntpdate ntp ipset jq iptables curl sysstat libseccomp wget git vim net-tools

4、关闭防火墙

[root@node1 ~]# systemctl stop firewalld
[root@node1 ~]# systemctl disable firewalld

5、关闭swap以及selinux

[root@node1 ~]# vim /etc/fstab
#/dev/mapper/centos-swap swap                    swap    defaults        0 0

[root@node1 ~]# swapoff -a			//临时关闭

[root@node1 ~]# vim  /etc/selinux/config         //将enabled改成disabled,需要重启服务器
SELINUX=disabled

6、调整内核参数

[root@node1 ~]# modprobe br_netfilter

[root@node1 ~]#vim /etc/sysctl.d/kubernetes.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.ipv4.tcp_tw_recycle = 0
vm.swappiness = 0 
vm.overcommit_memory = 1
vm.panic_on_oom = 0
fs.inotify.max_user_instances = 8192
fs.inotify.max_user_watches = 524288
fs.file-max = 52706963
fs.nr_open = 52706963
net.ipv6.conf.all.disable_ipv6 = 1

##生效
[root@node1 ~]# sysctl -p /etc/sysctl.d/kubernetes.conf

7、设置时区

[root@node1 ~]# ntpdate time.windows.com

8、降低环境资源，关闭邮件服务

[root@node1 ~]# systemctl stop postfix && systemctl disable postfix

三、环境部署（所有节点）

1、Kube-proxy开启ipvs的前置条件

[root@node1 ~]# cat >/etc/sysconfig/modules/ipvs.modules <

2、部署k8s

[root@node1 ~]# yum -y install yum-utils device-mapper-persistemt-data lvm2

2.1、下载阿里源（docker）

[root@node1 ~]# yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

2.2、安装docker

[root@node1 ~]# yum -y install docker-ce-19.03.15 docker-ce-cli-19.03.15 containerd.io

##启动并设置成开机自启
[root@node1 ~]# systemctl start docker && systemctl enable docker

##配置daemon
cat > /etc/docker/daemon.json <

2.3、安装Kubeadm（主从配置）

##Kubernetes  yum源配置
cat < /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

##下载包
[root@node1 ~]#yum install -y kubelet-1.18.19 kubeadm-1.18.19 kubectl-1.18.19

##kubelet开机自启
[root@node1 ~]# systemctl enable kubelet.service

##修改kubelet的cgroups也为systemd
[root@node1 ~]# vim /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf
Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml --cgroup-driver=systemd"

##重启服务
[root@node1 ~]# systemctl daemon-reload

2.4、初始化主节点

##生成kubeadm-config.yaml
[root@node1 ~]# kubeadm config print init-defaults  > kubeadm-config.yaml

[root@node1 ~]# vim kubeadm-config.yaml
advertiseAddress: 192.168.100.1			//自己机器的ip
kubernetesVersion: v1.18.19					//改成当前版本
image-repository: registry.cn-hangzhou.aliyuncs.com/google_containers

networking:								//添加一行内容
   dnsDomain: cluster.local
   podSubnet: "10.244.0.0/16"			//添加此行

在页尾添加：			//使用IPvs网络模式进行调度
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
        SupportIPVSProxyMode: true
mode: ipvs

##可以提前下载镜像，节约时间（下载镜像方式1）
kubeadm config images pull –-config /root/new.yaml

##因为需要下载很多镜像提前下载（下载镜像方式2）
[root@node1 ~]# kubeadm config images list		//查看需要什么镜像
k8s.gcr.io/kube-apiserver:v1.18.19
k8s.gcr.io/kube-controller-manager:v1.18.19
k8s.gcr.io/kube-scheduler:v1.18.19
k8s.gcr.io/kube-proxy:v1.18.19
k8s.gcr.io/pause:3.2
k8s.gcr.io/etcd:3.4.3-0
k8s.gcr.io/coredns:1.6.7


##下载镜像
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.18.19
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.18.19
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.18.19
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.18.19
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.3-0
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.7


##修改tag
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.18.19 k8s.gcr.io/kube-apiserver:v1.18.19
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.18.19 k8s.gcr.io/kube-controller-manager:v1.18.19
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.18.19 k8s.gcr.io/kube-scheduler:v1.18.19
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.18.19 k8s.gcr.io/kube-proxy:v1.18.19
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2 k8s.gcr.io/pause:3.2
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.3-0 k8s.gcr.io/etcd:3.4.3-0
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.7 k8s.gcr.io/coredns:1.6.7

[root@node1 ~]# docker images			//确认包是否拉取下来


##初始化
##如果kubelet、kubeadm、kubectl版本过高，且想用kubeadm得方式初始化得话，可以使用下面命令来更新config初始化文件
kubeadm config migrat --old-config kubeadm-config.yaml --new-config new.yaml
##如果初始化失败了，可以使用以下命令清掉相关配置，重新初始化
Kubuadm reset 

[root@node1 ~]# kubeadm init --config kubeadm-config.yaml 

##执行成功结果：
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 192.168.100.1:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:18cd7c97516d56a2a739935b73d9cebf3daae1e9615d83180d9fb568853a8c97


##根据提示创建对应目录并赋权
[root@node1 ~]# mkdir -p $HOME/.kube
[root@node1 ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@node1 ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config

2.5、Node2与Node3加入集群（node2跟node3都需要执行）

[root@node2 ~]# kubeadm join 192.168.100.1:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:18cd7c97516d56a2a739935b73d9cebf3daae1e9615d83180d9fb568853a8c97

2.6、查看是否成功加入集群

[root@node1 ~]# kubectl get node
NAME    STATUS     ROLES    AGE    VERSION
node1   NotReady   master   106s   v1.18.19
node2   NotReady      14s    v1.18.19
node3   NotReady      4s     v1.18.19

3、部署calico网络

[root@node1 ~]# wget https://docs.projectcalico.org/manifests/calico.yaml

[root@node1 ~]# kubectl apply -f calico.yaml

##报错：##如果执行calico.yaml报错：
error: unable to recognize "calico.yaml": no matches for kind "PodDisruptionBudget" in version "policy/v1" 

##处理：
原因是版本不支持，去官网下载对应的calico.yaml重新上传
[root@node1 ~]# curl https://docs.projectcalico.org/archive/v3.20/manifests/calico.yaml -O

[root@node1 ~]# kubectl apply -f calico.yaml

##验证：
[root@node1 ~]# kubectl get nodes
NAME    STATUS   ROLES    AGE     VERSION
node1   Ready    master   6h37m   v1.18.19
node2   Ready       6h36m   v1.18.19
node3   Ready       6h36m   v1.18.19