安装K8s集群
因阿里云加速服务调整，镜像加速服务自2024年7月起不再支持，拉取镜像，下载网络插件等操作，需要国际联网访问DockerHub。
安装全过程均使用ROOT权限。
1.安装前准备工作
这里采用3台CentOS虚拟机进行集群安装，安装前需要环境准备：
使用虚拟机VMware新建一个NAT类型网络(一般都会默认自带，只进行设置即可)，我的起名叫VMnet8，设置VMnet8的子网IP为
192.168.228.0，子网掩码为255.255.255.0，网关地址为192.168.228.2，起止IP地址范围192.168.228.3-192.168.228.254，并勾选"将主机虚拟适配器连接到此网络"为物理机分配IP地址，一般会分配192.168.228.1给物理机。VMware安装3台Linux虚拟机，可以安装一台，然后完整克隆，这里我采用的安装镜像版本是CentOS-7-x86_64-Minimal-2009，安装完成后，设置网络为VMnet8，将IP获取方式由DHCP修改为静态，并将IP地址分别设置为
192.168.228.131，192.168.228.132，192.168.228.133，再分别设置网关，子网掩码，DNS，MAC地址，并保证MAC地址互相不重复。
系统下载地址 https://mirrors.aliyun.com/centos/7/isos/x86_64/
2.安装docker
K8s是个容器编排工具，需要容器环境，每台机器都要安装docker环境。
2.1 修改机器的yum源
我使用的版本无法从官方镜像源下载软件包，所以替换为阿里云的yum源
打开配置文件
vi /etc/yum.repos.d/CentOS-Base.repo
复制粘贴以下内容进去
[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
刷新yum
yum clean all
2.2 安装yum-utils
yum install -y yum-utils
2.3 添加docker的yum源
执行命令，添加docker的阿里云yum加速地址
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
2.4 安装docker
执行安装命令，安装docker的三个组件
yum install -y docker-ce-20.10.7 docker-ce-cli-20.10.7 containerd.io-1.4.6
2.5 设置docker
立即启动docker，并设置开机启动
systemctl enable docker --now
打印docker信息，确定安装和启动完成
docker info
2.6 设置docker镜像加速
登录阿里云容器镜像服务https://cr.console.aliyun.com/cn-shanghai/instances/mirrors，并获取自己的加速地址。
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://***************.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
3.安装K8s集群
3.1 安装条件
- 兼容的Linux发行版（Ubuntu，CentOS等等）
- 机器需要2GB内存，CPU2核及以上
- 集群中机器网络彼此互通
- 集群中不可有重复的主机名
- 集群中不可有重复的MAC地址
3.2 安装规划
主节点一台机器，从节点两台机器
主节点master
主机名：
k8s131， IP：192.168.228.131从节点node
主机名：
k8s132， IP：192.168.228.132
主机名：k8s133， IP：192.168.228.133
3.3 安装前设置
三台机器都要进行设置。
1.设置主机名
在对应IP地址的机器上分别设置主机名为k8s131，k8s132，k8s133
hostnamectl set-hostname xxx
执行后，检查是否都设置好了
hostname
会话exit退出后重连shell，就会看到shell的计算机名已经变成了自己设置的计算机名root@k8s131
Last login: Thu Nov 21 17:47:02 2024 from 192.168.228.1
[root@k8s133 ~]#
2.关闭交换分区
使用free -m命令，可以查看交换分区情况，安装K8s前，需要关闭交换分区，且永久关闭
[root@localhost ~]# free -m
total used free shared buff/cache available
Mem: 1819 309 1166 9 342 1360
Swap: 2047 0 2047
执行命令，永久关闭交换分区(将Swap设置为 0 0 0)
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
3.禁用，并永久禁用SELinux
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
4.设置允许iptables检查桥接流量
将IPV6流量桥接到IPV4网卡上，是K8s官方要求的做法
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system
5.关闭防火墙
CentOS7默认打开防火墙firewalld，3台都需要关闭firewalld
systemctl stop firewalld
systemctl disable firewalld
3.4 安装K8s组件
1.安装kubelet、kubeadm、kubectl
首先添加k8s软件包的yum源到三台机器
cat <<EOF | sudo tee /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=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
EOF
三台机器依次执行安装命令
sudo yum install -y kubelet-1.20.9 kubeadm-1.20.9 kubectl-1.20.9 --disableexcludes=kubernetes
三台机器都启动kubelet，并设置开机启动
sudo systemctl enable --now kubelet
不停执行systemctl status kubelet会发现服务一直处于闪断状态，因为kubelet一直在等待
3.5 初始化主节点
使用kubeadm引导集群，初始化主节点。
1.首先所有机器都要先下载需要的镜像
docker pull registry.k8s.io/kube-apiserver:v1.20.9
docker pull registry.k8s.io/kube-proxy:v1.20.9
docker pull registry.k8s.io/kube-controller-manager:v1.20.9
docker pull registry.k8s.io/kube-scheduler:v1.20.9
docker pull registry.k8s.io/coredns:1.7.0
docker pull registry.k8s.io/etcd:3.4.13-0
docker pull registry.k8s.io/pause:3.2
下载完成后docker images验证
2.设置主节点域名映射
3台机器都必须添加master节点(又叫集群的入口节点)的域名映射，IP按实际情况修改。
echo "192.168.228.131 cluster-endpoint" >> /etc/hosts
3.初始化主节点
在主节点所在机器上执行命令，初始化主节点
参数解释
--service-cidr,--pod-network-cidr两项设置的网络范围不能重叠，也不能同服务器所在网络范围重叠。--apiserver-advertise-address改成自己主节点的IP。--control-plane-endpoint改为自己设置的主节点域名。
命令
kubeadm init \
--image-repository registry.k8s.io \
--apiserver-advertise-address=192.168.228.131 \
--control-plane-endpoint=cluster-endpoint \
--kubernetes-version=v1.20.9 \
--service-cidr=10.96.0.0/16 \
--pod-network-cidr=192.168.23.0/24
等待初始化完成后，终端输出提示成功，说明初始化完成。输出的内容需要复制保存备用。
[root@k8s131 ~]# kubeadm init \
> --image-repository registry.k8s.io \
> --apiserver-advertise-address=192.168.228.131 \
> --control-plane-endpoint=cluster-endpoint \
> --kubernetes-version=v1.20.9 \
> --service-cidr=10.96.0.0/16 \
> --pod-network-cidr=192.168.23.0/24
[init] Using Kubernetes version: v1.20.9
[preflight] Running pre-flight checks
[WARNING Firewalld]: firewalld is active, please ensure ports [6443 10250] are open or your cluster may not function correctly
[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 20.10.7. Latest validated version: 19.03
[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'
[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 [cluster-endpoint k8s131 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.228.131]
[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 [k8s131 localhost] and IPs [192.168.228.131 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [k8s131 localhost] and IPs [192.168.228.131 127.0.0.1 ::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"
[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 14.007116 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.20" 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 k8s131 as control-plane by adding the labels "node-role.kubernetes.io/master=''" and "node-role.kubernetes.io/control-plane='' (deprecated)"
[mark-control-plane] Marking the node k8s131 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: 4qn4kj.52saric9a3vqnk1w
[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/
You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:
kubeadm join cluster-endpoint:6443 --token 4qn4kj.52saric9a3vqnk1w \
--discovery-token-ca-cert-hash sha256:7f12181600006aeb62fb38bcb82582809a9ad1911e49065f1fd13f9c68c95774 \
--control-plane
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join cluster-endpoint:6443 --token 4qn4kj.52saric9a3vqnk1w \
--discovery-token-ca-cert-hash sha256:7f12181600006aeb62fb38bcb82582809a9ad1911e49065f1fd13f9c68c95774
4.配置文件目录
按照上述的输出提示“To start using your cluster, you need to run the following as a regular user” 还需要需要在主节点执行下面的命令
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
5.部署网络插件
按照上述的输出提示 You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml"，接下来还需要部署一个pod网络插件到master节点上。
输入命令kubectl get nodes -A，测试下主节点状态，返回NotReady是因为还没有部署网络插件。
[root@k8s131 ~]# kubectl get nodes -A
NAME STATUS ROLES AGE VERSION
k8s131 NotReady control-plane,master 5h5m v1.20.9
k8s支持多种网络插件，例如calico，安装前要先将它的编排文件下载到本地目录
curl https://docs.projectcalico.org/v3.20/manifests/calico.yaml -O
配置文件中找到以下内容
# - name: CALICO_IPV4POOL_CIDR
# value: "192.168.0.0/16"
将默认的192.168.0.0/16修改为--pod-network-cidr=指定的地址192.168.23.0/24，并解除注释
- name: CALICO_IPV4POOL_CIDR
value: "192.168.23.0/24"
在主节点执行命令，部署网络插件calico，部署过程需要联网下载镜像
kubectl apply -f calico.yaml
[root@k8s131 opt]# kubectl apply -f calico.yaml
configmap/calico-config created
customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/kubecontrollersconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created
clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrole.rbac.authorization.k8s.io/calico-node created
clusterrolebinding.rbac.authorization.k8s.io/calico-node created
daemonset.apps/calico-node created
serviceaccount/calico-node created
deployment.apps/calico-kube-controllers created
serviceaccount/calico-kube-controllers created
poddisruptionbudget.policy/calico-kube-controllers created
输入kubectl get pods -A查看网络插件pod部署情况
状态为ContainerCreating，Init说明正在下载部署
[root@k8s131 opt]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-577f77cb5c-wpxh7 0/1 ContainerCreating 0 21m
kube-system calico-node-7wb4z 0/1 Init:2/3 0 9m3s
kube-system coredns-76c6f6bbc9-4q5f9 0/1 ContainerCreating 0 5h41m
kube-system coredns-76c6f6bbc9-nkdcl 0/1 ContainerCreating 0 5h41m
kube-system etcd-k8s131 1/1 Running 1 5h41m
kube-system kube-apiserver-k8s131 1/1 Running 1 5h41m
kube-system kube-controller-manager-k8s131 1/1 Running 1 5h41m
kube-system kube-proxy-nt5jf 1/1 Running 1 5h41m
kube-system kube-scheduler-k8s131 1/1 Running 1 5h41m
完成后状态均为Running
[root@k8s131 opt]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-577f77cb5c-wpxh7 1/1 Running 0 24m
kube-system calico-node-7wb4z 1/1 Running 0 12m
kube-system coredns-76c6f6bbc9-4q5f9 1/1 Running 0 5h44m
kube-system coredns-76c6f6bbc9-nkdcl 1/1 Running 0 5h44m
kube-system etcd-k8s131 1/1 Running 1 5h45m
kube-system kube-apiserver-k8s131 1/1 Running 1 5h45m
kube-system kube-controller-manager-k8s131 1/1 Running 1 5h45m
kube-system kube-proxy-nt5jf 1/1 Running 1 5h44m
kube-system kube-scheduler-k8s131 1/1 Running 1 5h45m
再次输入命令kubectl get nodes -A测试主节点状态，已经变为Ready，准备就绪，网络插件到此部署完成。
[root@k8s131 opt]# kubectl get nodes -A
NAME STATUS ROLES AGE VERSION
k8s131 Ready control-plane,master 5h53m v1.20.9
主节点至此初始化完成。
3.6 从节点加入集群
从节点加入集群的命令，在初始化主节点命令输出的内容中就有，在之前复制的输出内容中找到Then you can join any number of worker nodes by running the following on each as root:，并找到它下面的一行命令在每个从节点执行，该命令24小时内有效
kubeadm join cluster-endpoint:6443 --token 4qn4kj.52saric9a3vqnk1w \
--discovery-token-ca-cert-hash sha256:7f12181600006aeb62fb38bcb82582809a9ad1911e49065f1fd13f9c68c95774
如果令牌忘记了，或者超过了24小时，在master节点上执行下面的命令，生成新的令牌
kubeadm token create --print-join-command
在两个从节点执行这个命令，执行后，以下提示，说明加入成功
[root@k8s132 ~]# kubeadm join cluster-endpoint:6443 --token bjme49.uhg7ubgjn2m16b76 --discovery-token-ca-cert-hash sha256:7f12181600006aeb62fb38bcb82582809a9ad1911e49065f1fd13f9c68c95774
[preflight] Running pre-flight checks
[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 20.10.7. Latest validated version: 19.03
[WARNING Hostname]: hostname "k8s132" could not be reached
[WARNING Hostname]: hostname "k8s132": lookup k8s132 on 192.168.228.2:53: server misbehaving
[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.
回到主节点执行命令kubectl get nodes -A，查看节点状态，可以看到两个从节点了，但是状态是NotReady，此时执行kubectl get pods -A查看pods状态，发现是因为从节点的网络插件未初始化成功完成导致，此时需要耐心等待网络插件加载完成，以我的经验来说加载网络插件需要下载很久。
管理集群要靠主节点，kubectl命令只能在主节点执行
[root@k8s131 ~]# kubectl get nodes -A
NAME STATUS ROLES AGE VERSION
k8s131 Ready control-plane,master 2d23h v1.20.9
k8s132 NotReady <none> 6m49s v1.20.9
k8s133 NotReady <none> 6m41s v1.20.9
[root@k8s131 ~]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-577f77cb5c-wpxh7 1/1 Running 1 2d18h
kube-system calico-node-7wb4z 1/1 Running 1 2d18h
kube-system calico-node-plcdp 0/1 Init:ImagePullBackOff 0 8m22s
kube-system calico-node-zwmrg 0/1 Init:ImagePullBackOff 0 8m30s
kube-system coredns-76c6f6bbc9-4q5f9 1/1 Running 1 2d23h
kube-system coredns-76c6f6bbc9-nkdcl 1/1 Running 1 2d23h
kube-system etcd-k8s131 1/1 Running 2 2d23h
kube-system kube-apiserver-k8s131 1/1 Running 2 2d23h
kube-system kube-controller-manager-k8s131 1/1 Running 2 2d23h
kube-system kube-proxy-flrq9 1/1 Running 0 8m22s
kube-system kube-proxy-nt5jf 1/1 Running 2 2d23h
kube-system kube-proxy-tcrjv 1/1 Running 0 8m30s
kube-system kube-scheduler-k8s131 1/1 Running 2 2d23h
等到kubectl get pods -A全部变为Running，再次测试kubectl get nodes -A
[root@k8s131 ~]# kubectl get nodes -A
NAME STATUS ROLES AGE VERSION
k8s131 Ready control-plane,master 3d v1.20.9
k8s132 Ready <none> 23m v1.20.9
k8s133 Ready <none> 22m v1.20.9
所有节点状态都是Ready，至此，两个从节点加入了K8s集群并进入就绪状态，整个K8s集群安装完成！
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