kubeadm部署k8sv1.24使用cri-docker做为CRI

目的

测试使用cri-docker做为containerd和docker的中间层垫片。

规划

配置

步骤：

1. 系统优化 禁用swap，设置ip_forward hosts地址配置 等
2. 配置docker源
3. 配置kubernetes源
4. kubeadm初始化
5. 取消master节点的污点

由于在局域网中配置了代理，所以不使用国内源。

配置hosts地址

[root@master02 ~]#grep master /etc/hosts
10.0.6.5 master01.kktb.org
10.0.6.6 master02.kktb.org
10.0.6.7 master03.kktb.org
# 这样get node出来的节点名是主机名
[root@master01 ~]#kubectl get node 
NAME                STATUS   ROLES           AGE   VERSION
master01.kktb.org   Ready    control-plane   35m   v1.24.3
master02.kktb.org   Ready    control-plane   28m   v1.24.3
master03.kktb.org   Ready    control-plane   22m   v1.24.3
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docker

for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done
sudo install -m 0755 -d /etc/apt/keyrings

apt-get install -y apt-transport-https ca-certificates curl

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

echo   "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
"$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" |   sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
apt-cache madison docker-ce | awk '{ print $3 }'
VERSION_STRING=5:20.10.24~3-0~ubuntu-jammy
apt-get install docker-ce=$VERSION_STRING docker-ce-cli=$VERSION_STRING containerd.io docker-buildx-plugin docker-compose-plugin
docker run hello-world
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查看当前的cgroup驱动是不是systemd，不是的话要更改

[root@master03 ~]#docker info |grep -i driver
 Storage Driver: overlay2
 Logging Driver: json-file
 Cgroup Driver: systemd
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kubernetes源

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.24/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.28/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list

apt update
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配置组件

apt install -y kubeadm=1.24.3-1.1 kubelet=1.24.3-1.1 kubectl=1.24.3-1.1
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配置cri-docker中间层

curl -LO https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.0/cri-dockerd_0.3.0.3-0.ubuntu-jammy_amd64.deb
dpkg -i cri-dockerd_0.3.0.3-0.ubuntu-jammy_amd64.deb
systemctl status cri-docker.service
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kubeadm初始化集群

列出需要的镜像

[root@master01 ~]#kubeadm config images list
I0917 08:39:15.852977  207252 version.go:255] remote version is much newer: v1.28.2; falling back to: stable-1.24
k8s.gcr.io/kube-apiserver:v1.24.17
k8s.gcr.io/kube-controller-manager:v1.24.17
k8s.gcr.io/kube-scheduler:v1.24.17
k8s.gcr.io/kube-proxy:v1.24.17
k8s.gcr.io/pause:3.7
k8s.gcr.io/etcd:3.5.3-0
k8s.gcr.io/coredns/coredns:v1.8.6
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拉取镜像

[root@master01 ~]#kubeadm config images pull --kubernetes-version=v1.24.0 --cri-socket unix:///run/cri-dockerd.sock
[config/images] Pulled k8s.gcr.io/kube-apiserver:v1.24.0
[config/images] Pulled k8s.gcr.io/kube-controller-manager:v1.24.0
[config/images] Pulled k8s.gcr.io/kube-scheduler:v1.24.0
[config/images] Pulled k8s.gcr.io/kube-proxy:v1.24.0
[config/images] Pulled k8s.gcr.io/pause:3.7
[config/images] Pulled k8s.gcr.io/etcd:3.5.3-0
[config/images] Pulled k8s.gcr.io/coredns/coredns:v1.8.6
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初始化集群

[root@master01 ~]#kubeadm init --control-plane-endpoint="master01.kktb.org" --kubernetes-version=v1.24.0 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --token-ttl=0 --cri-socket unix:///run/cri-dockerd.sock --upload-certs
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逐个参数解释

init 初始化集群
reset 重置集群，如果创建集群失败可以执行此命令重置集群
--control-plane-endpoint 控制平面的节点，可以是IP地址也可以是主机名，主机名要配置到hosts文件中，不然解析失败
--kubernetes-version 安装的k8s集群版本，跟配置的apt 源和拉取的镜像版本要保持一致
--pod-network-cidr 集群中的pod的网段
--service-cidr 集群中service的网段
--token-ttl 加入集群的token过期时间 0 表示永远不过期，不安全 
--cri-socket 指定集群调用的cri的socket路径
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输出

[init] Using Kubernetes version: v1.24.0
# 执行安装前检查
[preflight] Running pre-flight checks
	[WARNING SystemVerification]: missing optional cgroups: blkio
# 拉取启动集群所需要的镜像 这要花费一段时间 取决于你的网络连接
[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
# 也可以在安装集群前使用Kubeam config images pull提前拉取镜像
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
# 使用的证书文件夹
[certs] Using certificateDir folder "/etc/kubernetes/pki"
# 生成集群ca证书和key
[certs] Generating "ca" certificate and key
# 生成apiserver证书
[certs] Generating "apiserver" certificate and key
# apiserver服务的证书地址已签发，service名称和IP是xxx
[certs] apiserver serving cert is signed for DNS names [kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local master01.kktb.org] and IPs [10.96.0.1 10.0.6.5]
[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
# etcd的service证书和dns解析名字
[certs] etcd/server serving cert is signed for DNS names [localhost master01.kktb.org] and IPs [10.0.6.5 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [localhost master01.kktb.org] and IPs [10.0.6.5 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
# 生成serviceaccount的私钥和公钥
[certs] Generating "sa" key and public key
# kubeconfig集群密钥的文件夹
[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服务配置文件
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
# 使用的清单文件夹
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
# 创建k8s集群的关键服务的静态pod
[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"
# 创建惊天pod etcd的部署文件位置
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
# 等待kubelet服务启动控制节点的静态pod 从/etc/xxx目录 
[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检查所有的控制平面节点的健康状态用时
[apiclient] All control plane components are healthy after 24.002949 seconds
# 在kube-system 命名空间中使用configmap资源类型存储配置信息kubeadm-config
[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
# 存储证书
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
1df01c66c2f92b14360bcaf893f6b3f6a5921fa65a6b080d9423a8362243f487
# 标记master01节点未控制平面节点并添加label标签
[mark-control-plane] Marking the node master01.kktb.org as control-plane by adding the labels: [node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
# 添加控制平面节点禁止调度污点
[mark-control-plane] Marking the node master01.kktb.org as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule node-role.kubernetes.io/control-plane:NoSchedule]
[bootstrap-token] Using token: zcg7j7.zti8f568uzi9k6hn
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
# 配置rbac role-based access control 基于角色的访问控制密钥获取节点
[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
# 应用 必要的插件 coredns kube-proxy
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
# 控制平面初始化完成
Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:
# 配置kubeconfig文件到当前用户的家目录中
  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:
# root用户可以运行
  export KUBECONFIG=/etc/kubernetes/admin.conf
# 部署网络插件
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/

You can now join any number of the control-plane node running the following command on each as root:
# 在其他控制平面节点使用下面的命令将节点添加到集群
  kubeadm join master01.kktb.org:6443 --token zcg7j7.zti8f568uzi9k6hn \
	--discovery-token-ca-cert-hash sha256:23d1070adacf75c3f79b577d966afe0286c9a06bc77dc25a8fd766487935fb94 \
	--control-plane --certificate-key 1df01c66c2f92b14360bcaf893f6b3f6a5921fa65a6b080d9423a8362243f487
# 默认证书在两个小时删除，可以使用如下命令重新生成证书
Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.
# 在工作节点worker 添加主机到集群中
Then you can join any number of worker nodes by running the following on each as root:

kubeadm join master01.kktb.org:6443 --token zcg7j7.zti8f568uzi9k6hn \
	--discovery-token-ca-cert-hash sha256:23d1070adacf75c3f79b577d966afe0286c9a06bc77dc25a8fd766487935fb94 
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配置网络插件flannel，安装时候用了flannel中默认的pod和svc的地址段，所以直接apply就行无需更改任何内容

[root@master01 ~]#kubectl apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml
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
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其他master节点加入集群

kubeadm join master01.kktb.org:6443 --token zcg7j7.zti8f568uzi9k6hn --discovery-token-ca-cert-hash sha256:23d1070adacf75c3f79b577d966afe0286c9a06bc77dc25a8fd766487935fb94 --control-plane --certificate-key 1df01c66c2f92b14360bcaf893f6b3f6a5921fa65a6b080d9423a8362243f487 --cri-socket unix:///run/cri-dockerd.sock
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[root@master01 ~]#kubectl get pod -o wide 
NAME                       READY   STATUS    RESTARTS   AGE     IP           NODE                NOMINATED NODE   READINESS GATES
demoapp-78b49597cf-5f5dc   1/1     Running   0          9m44s   10.244.0.2   master01.kktb.org   <none>           <none>
demoapp-78b49597cf-fmqn8   1/1     Running   0          9m44s   10.244.0.3   master01.kktb.org   <none>           <none>
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允许master节点参与调度

[root@master01 ~]#kubectl taint node master01.kktb.org node-role.kubernetes.io/master-
node/master01.kktb.org untainted
[root@master01 ~]#kubectl taint node master01.kktb.org node-role.kubernetes.io/control-plane-
node/master01.kktb.org untainted
# 一次允许所有的master节点允许调度
[root@master01 ~]#kubectl taint nodes --all node-role.kubernetes.io/control-plane-
[root@master01 ~]#kubectl taint nodes --all node-role.kubernetes.io/master-
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创建pod测试

[root@master01 ~]#kubectl create deployment demoapp --image=ikubernetes/demoapp:v1.0 --replicas=2
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验证其他节点也能被调度

[root@master01 ~]#kubectl scale deployment demoapp --replicas 3
deployment.apps/demoapp scaled
[root@master01 ~]#kubectl scale deployment demoapp --replicas 6
[root@master01 ~]#kubectl get pod -o wide 
NAME                       READY   STATUS    RESTARTS   AGE   IP           NODE                NOMINATED NODE   READINESS GATES
demoapp-78b49597cf-5f5dc   1/1     Running   0          10m   10.244.0.2   master01.kktb.org   <none>           <none>
demoapp-78b49597cf-dgcdz   1/1     Running   0          16s   10.244.2.3   master03.kktb.org   <none>           <none>
demoapp-78b49597cf-fmqn8   1/1     Running   0          10m   10.244.0.3   master01.kktb.org   <none>           <none>
demoapp-78b49597cf-j94ts   1/1     Running   0          16s   10.244.1.4   master02.kktb.org   <none>           <none>
demoapp-78b49597cf-k8mkw   1/1     Running   0          16s   10.244.1.5   master02.kktb.org   <none>           <none>
demoapp-78b49597cf-sq6vz   1/1     Running   0          24s   10.244.2.2   master03.kktb.org   <none>           <none>
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