不背锅运维:分享Ubuntu20和Centos7中使用kubeadm搭建k8s集群

一、Ubunt环境

1. 测试环境机器规划

角色

主机名

IP地址

master

test-b-k8s-master

192.168.11.13

node

test-b-k8s-node01

192.168.11.14

node

test-b-k8s-node02

192.168.11.15

2. 软件环境版本

软件

版本

OS

Ubuntu 20.04.5 focal

Docker

Docker version 20.10.21

Kubernetes

v1.25.4

3. 初始化配置(所有节点)

修改阿里apt源

sudo vi /etc/apt/sources.list

deb https://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
# deb https://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

sudo apt-get update -y

关闭防火墙

sudo ufw disable

关闭selinux

略...

我安装的ubuntu20默认没有selinux这东西,因此不涉及关闭

关闭swap

sudo swapoff -a # 临时
sudo sed -ri 's/.*swap.*/#&/' /etc/fstab # 永久

添加hosts

sudo vi /etc/hosts

192.168.11.13 test-b-k8s-master
192.168.11.14 test-b-k8s-node01
192.168.11.15 test-b-k8s-node02

将桥接的IPv4流量传递到iptables的链

sudo vi /etc/sysctl.d/k8s.conf

net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1

sudo sysctl --system

时间同步

sudo apt install ntpdate
sudo ntpdate time.windows.com

4. 安装Docker/cri-dockerd/kubeadm/kubelet/kubectl(所有节点)

安装Docker-ce

sudo apt-get -y install apt-transport-https ca-certificates software-properties-common
sudo curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get -y update && sudo apt-get -y install docker-ce


# 配置镜像下载加速器
sudo vi /etc/docker/daemon.json
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"],
  "exec-opts": ["native.cgroupdriver=systemd"]
}

sudo systemctl daemon-reload && sudo systemctl restart docker && sudo docker info

安装cri-dockerd

wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.2.6/cri-dockerd_0.2.6.3-0.ubuntu-focal_amd64.deb
sudo dpkg -i cri-dockerd_0.2.6.3-0.ubuntu-focal_amd64.deb

# 指定依赖镜像地址
sudo vi /usr/lib/systemd/system/cri-docker.service
ExecStart=/usr/bin/cri-dockerd --container-runtime-endpoint fd:// --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:latest

sudo systemctl daemon-reload && sudo systemctl enable cri-docker && sudo systemctl restart cri-docker

安装kubeadm,kubelet和kubectl

# 添加k8s的阿里云apt源
sudo apt-get install -y apt-transport-https ca-certificates

sudo vi /etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main

sudo curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | sudo apt-key add -

# 开始安装
sudo apt-get update -y && sudo apt-get install -y kubelet kubeadm kubectl && sudo systemctl enable kubelet.service

5. 部署Kubernetes Master

在192.168.11.13(Master)执行

sudo kubeadm init 
  --apiserver-advertise-address=192.168.11.13 
  --image-repository registry.aliyuncs.com/google_containers 
  --kubernetes-version v1.25.4 
  --service-cidr=10.96.0.0/12 
  --pod-network-cidr=10.244.0.0/16 
  --cri-socket=unix:///var/run/cri-dockerd.sock 
  --ignore-preflight-errors=all

配置kubectl使用的连接k8s认证文件

# 普通用户
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# 管理员(可加到环境变量)
export KUBECONFIG=/etc/kubernetes/admin.conf

6. 加入节点

在2台node节点上执行

sudo kubeadm join 192.168.11.13:6443 --token o37091.z858bts6jmth9irz 
--discovery-token-ca-cert-hash sha256:628a5b50227c93e465adc1ca380cf335e8f639c15c8a92892f9d22b71ac6c2ac 
--cri-socket=unix:///var/run/cri-dockerd.sock

上面用到的token,默认token有效期为24小时,当过期之后,该token就不可用了。这时就需要重新创建token,可以直接使用命令快捷生成:

sudo kubeadm token create --print-join-command

加入后在master查看工作节点

tantianran@test-b-k8s-master:~$ kubectl get nodes
NAME                STATUS     ROLES           AGE     VERSION
test-b-k8s-master   NotReady   control-plane   7m57s   v1.25.4
test-b-k8s-node01   NotReady             14s     v1.25.4
test-b-k8s-node02   NotReady             8s      v1.25.4
tantianran@test-b-k8s-master:~$ 

目前工作节点的状态为NotReady,是因为还没有部署网络插件,等部署完就会处于Ready。

7. 部署容器网络接口(CNI)Calico

Calico是一个纯三层的数据中心网络方案,是目前Kubernetes主流的网络方案。下面开始部署Calico,在master上进行部署操作。

下载calico的YAML:

wget https://docs.projectcalico.org/manifests/calico.yaml

下载完后还需要修改里面定义Pod网络(CALICO_IPV4POOL_CIDR),与前面kubeadm init的 --pod-network-cidr指定的一样。

calico.yaml中CALICO_IPV4POOL_CIDR默认的配置如下:

# - name: CALICO_IPV4POOL_CIDR
#   value: "192.168.0.0/16"

取消注释,并修改成与前面kubeadm init的 --pod-network-cidr(10.244.0.0/16)指定的一样。

- name: CALICO_IPV4POOL_CIDR
value: "10.244.0.0/16"

修改完后文件后,开始部署:

# 部署calico
kubectl apply -f calico.yaml

接下来就是比较漫长的等待,等待多久取决于你的网速,如果网络的好的话,就会更快一点,因为它还要拉镜像,而且是3台节点都要拉取相关镜像,下面可以在master上查看位于kube-system命名空间下的pod

tantianran@test-b-k8s-master:~$ kubectl get pods -n kube-system
NAME                                        READY   STATUS     RESTARTS   AGE
calico-kube-controllers-798cc86c47-sg65n    0/1     Pending    0          111s
calico-node-9d2gz                           0/1     Init:0/3   0          111s
calico-node-csnwt                           0/1     Init:0/3   0          111s
calico-node-g7rk2                           0/1     Init:0/3   0          111s
coredns-c676cc86f-p2sgs                     0/1     Pending    0          19m
coredns-c676cc86f-pn5zk                     0/1     Pending    0          19m
etcd-test-b-k8s-master                      1/1     Running    0          19m
kube-apiserver-test-b-k8s-master            1/1     Running    0          19m
kube-controller-manager-test-b-k8s-master   1/1     Running    0          19m
kube-proxy-6bdwl                            1/1     Running    0          12m
kube-proxy-d8xgk                            1/1     Running    0          19m
kube-proxy-lcw2n                            1/1     Running    0          11m
kube-scheduler-test-b-k8s-master            1/1     Running    0          19m
tantianran@test-b-k8s-master:~$ 

等calico的全部pod状态都为Running的时候,就成功了。到时候你再去查看node的状态,应该也会为Ready了。

刚才提到,在部署calico的过程中3台节点都需要拉取相关镜像,可以到其中1台Node上查看有没有镜像了:

tantianran@test-b-k8s-node02:~$ sudo docker images
REPOSITORY                                           TAG       IMAGE ID       CREATED       SIZE
registry.aliyuncs.com/google_containers/kube-proxy   v1.25.4   2c2bc1864279   2 weeks ago   61.7MB
calico/cni                                           v3.24.5   628dd7088041   2 weeks ago   198MB
calico/node                                          v3.24.5   54637cb36d4a   2 weeks ago   226MB
registry.aliyuncs.com/google_containers/pause        latest    350b164e7ae1   8 years ago   240kB
tantianran@test-b-k8s-node02:~$ 

经过一小段时间等待后,calico相关的pod已经都为Running了

tantianran@test-b-k8s-master:~$ kubectl get pods -n kube-system
NAME                                        READY   STATUS    RESTARTS   AGE
calico-kube-controllers-798cc86c47-sg65n    1/1     Running   0          7m45s
calico-node-9d2gz                           1/1     Running   0          7m45s
calico-node-csnwt                           1/1     Running   0          7m45s
calico-node-g7rk2                           1/1     Running   0          7m45s
coredns-c676cc86f-p2sgs                     1/1     Running   0          25m
coredns-c676cc86f-pn5zk                     1/1     Running   0          25m
etcd-test-b-k8s-master                      1/1     Running   0          25m
kube-apiserver-test-b-k8s-master            1/1     Running   0          25m
kube-controller-manager-test-b-k8s-master   1/1     Running   0          25m
kube-proxy-6bdwl                            1/1     Running   0          17m
kube-proxy-d8xgk                            1/1     Running   0          25m
kube-proxy-lcw2n                            1/1     Running   0          17m
kube-scheduler-test-b-k8s-master            1/1     Running   0          25m
tantianran@test-b-k8s-master:~$ 

继续查看工作节点的状态,也是Ready状态了

tantianran@test-b-k8s-master:~$ kubectl get nodes
NAME                STATUS   ROLES           AGE   VERSION
test-b-k8s-master   Ready    control-plane   26m   v1.25.4
test-b-k8s-node01   Ready              19m   v1.25.4
test-b-k8s-node02   Ready              19m   v1.25.4
tantianran@test-b-k8s-master:~$ 

到此为止!CNI网络插件calico就已经完成部署啦!

8. 部署Dashboard

Dashboard是官方提供的一个UI,可用于基本管理K8s资源,也是在master上进行部署操作。github项目地址:https://github.com/kubernetes/dashboard

YAML下载地址:

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml

默认Dashboard只能集群内部访问,下载yaml文件后,修改Service为NodePort类型,暴露到外部:

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30001 # 增加这个(等会我们访问UI的端口)
  selector:
    k8s-app: kubernetes-dashboard
  type: NodePort # 增加这个(让每个节点都可访问)

开始部署

kubectl apply -f recommended.yaml

这时候,也是需要等待到dashboard相关的pod为Running的状态,它也是要拉镜像,可查看命名空间kubernetes-dashboard下的pod:

tantianran@test-b-k8s-master:~$ kubectl get pods -n kubernetes-dashboard
NAME                                         READY   STATUS              RESTARTS   AGE
dashboard-metrics-scraper-64bcc67c9c-nnzqv   0/1     ContainerCreating   0          17s
kubernetes-dashboard-5c8bd6b59-blpgm         0/1     ContainerCreating   0          17s
tantianran@test-b-k8s-master:~$ 

等待后,再次查看,dashboard相关的pod已经为Running的状态,说明已经部署好

tantianran@test-b-k8s-master:~$ kubectl get pods -n kubernetes-dashboard
NAME                                         READY   STATUS    RESTARTS   AGE
dashboard-metrics-scraper-64bcc67c9c-nnzqv   1/1     Running   0          2m
kubernetes-dashboard-5c8bd6b59-blpgm         1/1     Running   0          2m

接下来就可以访问任意节点的30001端口访问UI,记得是用https哦

创建登录UI的token

kubectl create serviceaccount dashboard-admin -n kubernetes-dashboard
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:dashboard-admin
kubectl create token dashboard-admin -n kubernetes-dashboard

将创建好的token复制进去即可完成登录

最后说明一下,以后所有yaml文件都只在Master节点执行(部署操作),切记!


二、CentOS7环境

1. 测试环境机器规划

角色

主机名

IP地址

master

test-a-k8s-master

192.168.11.10

node

test-a-k8s-node01

192.168.11.11

node

test-a-k8s-node02

192.168.11.12

2. 软件环境版本

软件

版本

OS

CentOS Linux release 7.9.2009

Docker

Docker version 20.10.21

Kubernetes

v1.25.4

3. 操作系统初始化配置(所有节点)

3.1 关闭防火墙

systemctl stop firewalld
systemctl disable firewalld

3.2 关闭selinux

sed -i 's/enforcing/disabled/' /etc/selinux/config  # 永久
setenforce 0  # 临时

3.3 关闭swap

swapoff -a  # 临时
sed -ri 's/.*swap.*/#&/' /etc/fstab    # 永久

3.4 根据规划设置主机名

hostnamectl set-hostname 

3.5 在master添加hosts

cat >> /etc/hosts << EOF
192.168.11.10 test-a-k8s-master
192.168.11.11 test-a-k8s-node01
192.168.11.12 test-a-k8s-node02
EOF

3.6 将桥接的IPv4流量传递到iptables的链

cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system  # 生效

3.7 时间同步

yum install ntpdate -y
ntpdate time.windows.com
ntpdate ntp1.aliyun.com # 阿里云时钟服务

4. 安装Docker/kubeadm/kubelet/cri-dockerd(所有节点)

4.1 安装Docker-ce

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum -y install docker-ce
systemctl enable docker && systemctl start docker

4.2 配置镜像下载加速器

cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"],
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

systemctl restart docker

docker info

4.3 安装cri-dockerd

wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.2.6/cri-dockerd-0.2.6-3.el7.x86_64.rpm
rpm -ivh cri-dockerd-0.2.6-3.el7.x86_64.rpm

4.4 指定依赖镜像地址

在cri-docker.service配置中的 fd:// 后面增加 --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.7 说明:pause:3.7 也可以指向最新的版本 pause:latest

vi /usr/lib/systemd/system/cri-docker.service

# 内容:
ExecStart=/usr/bin/cri-dockerd --container-runtime-endpoint fd:// --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.7

systemctl daemon-reload 
systemctl enable cri-docker && systemctl start cri-docker

4.5 添加阿里云YUM软件源

cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://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

4.6 安装kubeadm,kubelet和kubectl

yum install -y kubelet-1.25.4 kubeadm-1.25.4 kubectl-1.25.4
systemctl enable kubelet.service # 这里仅设置enable,后续部署的时候会自动交由kubeadm拉起

5. 部署Kubernetes Master

在192.168.11.10(Master)执行

kubeadm init 
  --apiserver-advertise-address=192.168.11.10 
  --image-repository registry.aliyuncs.com/google_containers 
  --kubernetes-version v1.25.4 
  --service-cidr=10.96.0.0/12 
  --pod-network-cidr=10.244.0.0/16 
  --cri-socket=unix:///var/run/cri-dockerd.sock 
  --ignore-preflight-errors=all

在进行更改之前,运行一些列检查,验证系统状态,有些检查只会触发警告,有些检查会被视为错误并退出kubeadm,因此使用 --ignore-preflight-errors=all 忽略检查中的错误。

初始化完成之后,最后会出现下面这样的提示:

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:
要开始使用集群,您需要以普通用户身份运行以下命令:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:
或者,如果您是root用户,则可以运行:

  export KUBECONFIG=/etc/kubernetes/admin.conf

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:

# 记住这个join命令,后面用,作用是在node节点运行这条命令,加入集群
kubeadm join 192.168.11.10:6443 --token pk474p.uvc65opv1zs625lq 
        --discovery-token-ca-cert-hash sha256:c14439c309345c6a02340bb7df74108c4cde6e0f8393f45a123f347f11b98b57

6. 配置kubectl使用的连接k8s认证文件

# 普通用户要开始使用集群,您需要以普通用户身份运行以下命令:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# 或者,如果您是root用户,则可以运行(可以加入到环境变量):
export KUBECONFIG=/etc/kubernetes/admin.conf

查看工作节点

[root@test-a-k8s-master ~]# kubectl get nodes
NAME                STATUS     ROLES           AGE   VERSION
test-a-k8s-master   NotReady   control-plane   12m   v1.25.4
[root@test-a-k8s-master ~]# 

由于网络插件还没有部署,还没有准备就绪 NotReady,先继续

7. 加入Kubernetes Node

向集群添加新节点,执行在kubeadm init输出的kubeadm join命令并手动加上--cri-socket=unix:///var/run/cri-dockerd.sock

# 在2台node上运行(192.168.11.11、192.168.11.12)
kubeadm join 192.168.11.10:6443 --token pk474p.uvc65opv1zs625lq 
--discovery-token-ca-cert-hash sha256:c14439c309345c6a02340bb7df74108c4cde6e0f8393f45a123f347f11b98b57 
--cri-socket=unix:///var/run/cri-dockerd.sock

上面用到的token,默认token有效期为24小时,当过期之后,该token就不可用了。这时就需要重新创建token,可以直接使用命令快捷生成:

kubeadm token create --print-join-command

8. 部署容器网络接口(CNI)Calico

Calico是一个纯三层的数据中心网络方案,是目前Kubernetes主流的网络方案。下面开始部署Calico,在master上进行部署操作。

下载calico的YAML:

wget https://docs.projectcalico.org/manifests/calico.yaml

下载完后还需要修改里面定义Pod网络(CALICO_IPV4POOL_CIDR),与前面kubeadm init的 --pod-network-cidr指定的一样。

calico.yaml中CALICO_IPV4POOL_CIDR默认的配置如下:

# - name: CALICO_IPV4POOL_CIDR
#   value: "192.168.0.0/16"

取消注释,并修改成与前面kubeadm init的 --pod-network-cidr指定的一样。

- name: CALICO_IPV4POOL_CIDR
value: "10.244.0.0/16"

修改完后文件后,开始部署:

# 部署calico
kubectl apply -f calico.yaml

# 查看kube-system命名空间下的pod
[root@test-a-k8s-master ~]# kubectl get pods -n kube-system
NAME                                        READY   STATUS              RESTARTS   AGE
calico-kube-controllers-798cc86c47-pd8zc    0/1     ContainerCreating   0          82s
calico-node-d54c9                           0/1     Init:0/3            0          82s
calico-node-prpdl                           0/1     Init:0/3            0          82s
calico-node-rkwzv                           1/1     Running             0          82s
coredns-c676cc86f-kw9v8                     1/1     Running             0          26m
coredns-c676cc86f-vfwz7                     1/1     Running             0          26m
etcd-test-a-k8s-master                      1/1     Running             0          26m
kube-apiserver-test-a-k8s-master            1/1     Running             0          26m
kube-controller-manager-test-a-k8s-master   1/1     Running             0          26m
kube-proxy-kv9rx                            1/1     Running             0          26m
kube-proxy-qphqt                            0/1     ContainerCreating   0          11m
kube-proxy-z5fjm                            0/1     ContainerCreating   0          11m
kube-scheduler-test-a-k8s-master            1/1     Running             0          26m
[root@test-a-k8s-master ~]# 

说明:以后所有yaml文件都只在Master节点执行。

等Calico Pod都Running,节点也会准备就绪。

再次查看工作节点,已经为Ready状态

[root@test-a-k8s-master ~]# kubectl get nodes
NAME                STATUS   ROLES           AGE     VERSION
test-a-k8s-master   Ready    control-plane   13m     v1.25.4
test-a-k8s-node01   Ready              8m43s   v1.25.4
test-a-k8s-node02   Ready              7m57s   v1.25.4
[root@test-a-k8s-master ~]# 

9. 部署Dashboard

Dashboard是官方提供的一个UI,可用于基本管理K8s资源,github项目地址:https://github.com/kubernetes/dashboard

YAML下载地址:

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml

默认Dashboard只能集群内部访问,修改Service为NodePort类型,暴露到外部:

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30001 # 增加这个(等会我们访问UI的端口)
  selector:
    k8s-app: kubernetes-dashboard
  type: NodePort # 增加这个(让每个节点都可访问)

开始部署

kubectl apply -f recommended.yaml

查看命名空间kubernetes-dashboard下的pod

[root@test-a-k8s-master ~]# kubectl get pods -n kubernetes-dashboard
NAME                                         READY   STATUS              RESTARTS   AGE
dashboard-metrics-scraper-64bcc67c9c-4jvvw   0/1     ContainerCreating   0          40s
kubernetes-dashboard-5c8bd6b59-v7nvm         1/1     Running             0          40s
[root@test-a-k8s-master ~]# 

等dashboard的pod状态都为running时,就完成了

创建登录UI的token

kubectl create serviceaccount dashboard-admin -n kubernetes-dashboard
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:dashboard-admin
kubectl create token dashboard-admin -n kubernetes-dashboard

访问任意节点的30001的端口都可以登录UI:

将创建好的token复制进去即可完成登录。

本文转载于(喜欢的盆友关注我们哦):https://mp.weixin.qq.com/s/F504vm7xbom4-rY7lgdhKw

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页面更新:2024-05-11

标签:集群   节点   端口   命令   状态   地址   环境   文件   工作   网络

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