Kubernetes集群基于Containerd部署

资源列表

操作系统	配置	主机名	IP
CentOS 7.9	2C4G	master	192.168.93.101
CentOS 7.9	2C4G	node1	192.168.93.102
CentOS 7.9	2C4G	node2	192.168.93.103

基础环境

• 关闭防火墙

systemctl stop firewalld
systemctl disable firewalld

• 关闭内核安全机制

setenforce 0
sed -i "s/^SELINUX=.*/SELINUX=disabled/g" /etc/selinux/config

• 修改主机名

hostnamectl set-hostname master
hostnamectl set-hostname node1
hostnamectl set-hostname node2

一、基础环境准备

• 三台主机都要操作，以master节点为例进行演示

1.1、关闭Swap分区

# 临时关闭
[root@master ~]# swapoff -a
# 永久关闭
[root@master ~]# sed -i 's/.*swap.*/#&/g' /etc/fstab

1.2、添加hosts解析

[root@master ~]# cat >> /etc/hosts << EOF
192.168.93.101 master
192.168.93.102 node1
192.168.93.103 node2
EOF

1.3、桥接的IPv4流量传递给iptables的链

# 加载 overlay 内核模块
[root@master ~]# modprobe overlay
# 加载 br_netfilter 模块
[root@master ~]# modprobe br_netfilter
[root@master ~]# cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
[root@master ~]# sysctl --system

二、准备Containerd容器运行时

• 三台主机都要操作，以master节点为例进行演示

2.1、安装Containerd

# 添加 docker 源，containerd也在docker源内的
[root@master ~]# cat <<EOF | sudo tee /etc/yum.repos.d/docker-ce.repo
[docker]
name=docker-ce
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/
enabled=1
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
EOF


# 快速建立 yum 缓存
[root@master ~]# yum makecache fast


# 安装containerd
# 列出所有containerd版本
[root@master ~]# yum list containerd.io --showduplicates
[root@master ~]# yum -y install containerd.io-1.6.6-3.1.el7.x86_64

2.2、配置Containerd

# 生成配置文件
[root@master ~]# mkdir -p /etc/containerd
[root@master ~]# containerd config default | sudo tee /etc/containerd/config.toml 


# 修改/etc/containerd/config.toml文件中sandbox_image的值
[root@master ~]# grep 'sandbox_image' /etc/containerd/config.toml 
# 在原有的基础上进行修改，
    sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.9"

2.3、启动Containerd

[root@master ~]# systemctl enable containerd
[root@master ~]# systemctl start containerd

三、部署Kubernetes集群

3.1、安装Kubeadm工具

• 所有节点都要操作

[root@master ~]# 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=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF


# 快速建立yum缓存
[root@master ~]# yum makecache fast


# 安装 kubectl：命令行管理工具、kubeadm：安装K8S集群工具、kubelet管理容器工具
[root@master ~]# yum install -y kubelet-1.27.0 kubeadm-1.27.0 kubectl-1.27.0


# 切记这个时候不要启动，只需要设置为开机自启
[root@master ~]# systemctl enable kubelet.service 

3.2、配置crictl工具

• crictl是CRI兼容的容器运行时命令行接口。你可以使用它来检查和调试Kubernetes节点上的容器运行时和应用程序。crictl和它的源代码在 cri-tools 代码库
• 更好 Containerd后，以上我们常用的docker命令也不再使用了，取而代之恶的分别是 crictl 和 ctr 两个命令行客户端
• crictl是遵循CRI接口规范的一个命令行工具，通常用它来检查和管理kubelet节点上的容器运行时和镜像
• ctr是containerd的一个客户端工具

# 所有节点都要操作
[root@master ~]# cat << EOF >> /etc/crictl.yaml
runtime-endpoint: unix:///var/run/containerd/containerd.sock
image-endpoint: unix:///var/run/containerd/containerd.sock
timeout: 10 
debug: false
EOF

3.3、配置Containerd镜像加速器

• 所有节点都要操作

# 在/etc/containerd/config.toml找到[plugins."io.containerd.grpc.v1.cri".registry.mirrors] ，默认在153行左右，在此行下面添加两行配置，阿里云的镜像加速器
[root@master ~]# vim /etc/containerd/config.toml 
  [plugins."io.containerd.grpc.v1.cri".registry.mirrors]
      [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
   endpoint = ["https://i9h06ghu.mirror.aliyuncs.com"]


# 保存退出，刷新服务
[root@master ~]# systemctl restart containerd

3.4、测试crictl工具是否可用

# 以拉取一个Nginx镜像进行演示是否可用
[root@master ~]# crictl pull nginx:latest
Image is up to date for sha256:605c77e624ddb75e6110f997c58876baa13f8754486b461117934b24a9dc3a85


# 查看镜像
[root@master ~]# crictl images
IMAGE                     TAG                 IMAGE ID            SIZE
docker.io/library/nginx   latest              605c77e624ddb       56.7MB

3.5、初始化Master节点

• 在master节点上操作

# 生成配置文件
[root@master ~]# kubeadm config print init-defaults > kubeadm-init.yaml


# 修改kubeadm-init.yaml文件的advertiseAddress、name、imageRepository，添加Pod网络podSubnet
[root@master ~]# vim kubeadm-init.yaml
apiVersion: kubeadm.k8s.io/v1beta3
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.93.101
  bindPort: 6443
nodeRegistration:
  criSocket: unix:///var/run/containerd/containerd.sock
  imagePullPolicy: IfNotPresent
  name: master
  taints: null
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta3
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns: {}
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: 1.27.0
networking:
  dnsDomain: cluster.local
  serviceSubnet: 10.96.0.0/12
  podSubnet: 10.244.0.0/16
scheduler: {}

# 初始化集群
[root@master ~]# kubeadm init --config=kubeadm-init.yaml
[init] Using Kubernetes version: v1.27.0
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
W0629 11:07:42.117214    8814 images.go:80] could not find officially supported version of etcd for Kubernetes v1.27.0, falling back to the nearest etcd version (3.5.7-0)
W0629 11:08:11.311847    8814 checks.go:835] detected that the sandbox image "registry.aliyuncs.com/google_containers/pause:3.9" of the container runtime is inconsistent with that used by kubeadm. It is recommended that using "registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.9" as the CRI sandbox image.
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local master] and IPs [10.96.0.1 192.168.93.101]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [localhost master] and IPs [192.168.93.101 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [localhost master] and IPs [192.168.93.101 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
W0629 11:08:41.485522    8814 images.go:80] could not find officially supported version of etcd for Kubernetes v1.27.0, falling back to the nearest etcd version (3.5.7-0)
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 6.001513 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node master as control-plane by adding the labels: [node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
[mark-control-plane] Marking the node master as control-plane by adding the taints [node-role.kubernetes.io/control-plane:NoSchedule]
[bootstrap-token] Using token: abcdef.0123456789abcdef
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy

Your Kubernetes control-plane has initialized successfully!

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
#####################################################################
Alternatively, if you are the root user, you can run:

  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:
#####################################################################
kubeadm join 192.168.93.101:6443 --token abcdef.0123456789abcdef \
	--discovery-token-ca-cert-hash sha256:aa55ff35b12c120ff5a12098622122c77eff343d033a54d069d3e55364b4184d 
#####################################################################

# 初始化成功以后要根据提示执行以下3个命令，才可以操作集群
[root@master ~]# mkdir -p $HOME/.kube
[root@master ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@master ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config

3.6、Node节点加入集群

• 所有Node节点都要操作

# node1节点
[root@node1 ~]# kubeadm join 192.168.93.101:6443 --token abcdef.0123456789abcdef \
> --discovery-token-ca-cert-hash sha256:aa55ff35b12c120ff5a12098622122c77eff343d033a54d069d3e55364b4184d
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...

This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node join the cluster.


# node2节点
[root@node2 ~]# kubeadm join 192.168.93.101:6443 --token abcdef.0123456789abcdef \
> --discovery-token-ca-cert-hash sha256:aa55ff35b12c120ff5a12098622122c77eff343d033a54d069d3e55364b4184d
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...

This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

# 如果加入集群的命令找不到了可以在master节点生成一个
[root@master ~]# kubeadm token create --print-join-command
kubeadm join 192.168.93.101:6443 --token 2d6hku.7esvsdqjfrvgkewg --discovery-token-ca-cert-hash sha256:aa55ff35b12c120ff5a12098622122c77eff343d033a54d069d3e55364b4184d 

四、部署网络插件（CNI）

4.1、拉取必要镜像

• 所有节点都需要拉取以下两个镜像

• 在部署网络插件的过程中，实测是可能会有两个镜像拉取不来下，所以手动拉取一下，不过要使用魔法，拉取不到了评论或私信（开源免费）

# 以下是拉取镜像的命令，所有节点都需要有这两个镜像
[root@master ~]# crictl pull docker.io/flannel/flannel-cni-plugin:v1.1.2
[root@master ~]# crictl pull docker.io/flannel/flannel:v0.21.5

• 如果有镜像的话，使用以下命令把镜像导入即可，我的镜像名字是自己打的标签

[root@master ~]# ctr -n k8s.io images import flannel.tar
unpacking docker.io/flannel/flannel:v0.21.5 (sha256:6f2d991efb758c5530e7de90761dfb29637b7604a807d431312e20189e09f9e6)...done
[root@master ~]# ctr -n k8s.io images import flannel-cni-plugin-v1.1.2.tar
unpacking docker.io/flannel/flannel-cni-plugin:v1.1.2 (sha256:539d3bf046c8581557f0747dbad9d3b78a4de112d3c0bf9d291651593060fc9f)...done


# 查看镜像
[root@master ~]# crictl images | grep flannel
docker.io/flannel/flannel-cni-plugin                                          v1.1.2              7a2dcab94698c       8.25MB
docker.io/flannel/flannel                                                     v0.21.5             a6c0cb5dbd211       69.9MB

4.2、部署网络插件

• master节点操作即可

• 没有网络插件的私信或评论（免费开源）

[root@master ~]# kubectl apply -f kube-flannel.yaml 
namespace/kube-flannel created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
serviceaccount/flannel created
configmap/kube-flannel-cfg created
daemonset.apps/kube-flannel-ds created

4.2、查看节点状态

[root@master ~]# kubectl get node
NAME     STATUS   ROLES           AGE   VERSION
master   Ready    control-plane   15m   v1.27.0
node1    Ready    <none>          12m   v1.27.0
node2    Ready    <none>          12m   v1.27.0

4.3、查看组件状态

[root@master ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS    MESSAGE                         ERROR
controller-manager   Healthy   ok                              
scheduler            Healthy   ok                              
etcd-0               Healthy   {"health":"true","reason":""}   

4.4、查看所有Pod状态

[root@master ~]# kubectl get pod -A
NAMESPACE      NAME                             READY   STATUS    RESTARTS   AGE
kube-flannel   kube-flannel-ds-bkp7z            1/1     Running   0          2m5s
kube-flannel   kube-flannel-ds-q2565            1/1     Running   0          2m5s
kube-flannel   kube-flannel-ds-vz72p            1/1     Running   0          2m5s
kube-system    coredns-65dcc469f7-6x74z         1/1     Running   0          16m
kube-system    coredns-65dcc469f7-j8266         1/1     Running   0          16m
kube-system    etcd-master                      1/1     Running   0          16m
kube-system    kube-apiserver-master            1/1     Running   0          16m
kube-system    kube-controller-manager-master   1/1     Running   0          16m
kube-system    kube-proxy-2npvg                 1/1     Running   0          16m
kube-system    kube-proxy-8kqps                 1/1     Running   0          13m
kube-system    kube-proxy-zbc4h                 1/1     Running   0          13m
kube-system    kube-scheduler-master            1/1     Running   0          16m

五、Containerd基本操作

4.1、Crictl镜像管理

# 下载镜像
[root@master ~]# crictl pull nginx:latest

# 查看所有镜像
[root@master ~]# crictl images

# 查看镜像详细信息
[root@master ~]# crictl inspecti nginx:latest

# 删除镜像
[root@master ~]# crictl rmi nginx:latest

4.2、Crictl容器管理

# 列出运行中的容器，查看所有容器加-a选项
[root@master ~]# crictl ps

# 查看容器的详细信息
[root@master ~]# crictl inspect 07376dc402441

# 启动容器
[root@master ~]# crictl start 07376dc402441

# 停止容器
[root@master ~]# crictl stop 07376dc402441

# 删除容器
[root@master ~]# crictl rm 07376dc402441

# 打印日志
crictl logs <container-id 或 container-name>

# 进入容器执行命令
crictl exec -it <container-id 或 container-name> sh

4.3、Crictl Pod管理

# 打印所有 Pod
[root@node2 ~]# crictl pods
# 根据pod名称打印pod信息
[root@master ~]# crictl pods --name kube-proxy-trnjn

# 根据标签打印 Pod，crictl pods --label key=value
[root@master ~]# crictl pods --label k8s-app=kube-proxy