k8s学习一:使用kubeadm安装k8s
【摘要】 写在开头在学习整个k8s之前,先想办法搭建个k8s出现成果,然后根据这个成果进行深入学习,才会让人有学习的动力,本文将记录自己的安装k8s教程准备工作:一台ubuntu服务器(虚拟机)k8s环境配置host配置我们先给服务器定义好hosts,便于直接找到该服务器ip192.168.192.9 master复制注意,后面如果需要增加集群,也需要配置其他的hosts主机名修改(非必要)修改 /e...
写在开头
在学习整个k8s之前,先想办法搭建个k8s出现成果,然后根据这个成果进行深入学习,才会让人有学习的动力,本文将记录自己的安装k8s教程
准备工作:
一台ubuntu服务器(虚拟机)
k8s环境配置
host配置
我们先给服务器定义好hosts,便于直接找到该服务器ip
192.168.192.9 master注意,后面如果需要增加集群,也需要配置其他的hosts
主机名修改(非必要)
修改 /etc/hostname 改为 master
关闭防火墙
由于k8s的防火墙规则和系统的冲突,所以需要关闭系统的防火墙
sudo ufw disable
systemctl stop ufw关闭selinux
关闭selinux以允许容器访问宿主机的文件系统 (新装的Ubuntu好像没这个东西,可以自行百度)
禁用swap
swap会在内存不足的时候使用磁盘当做内存,但是效率会非常低,导致服务器直接卡死
sudo swapoff -a
vi /etc/fstab # 将swap一行前面增加个# 号注释掉网络参数
vi /etc/sysctl.d/k8s.conf #将下面的3行(去掉#号写入到此文件)
#net.bridge.bridge-nf-call-ip6tables = 1
#net.bridge.bridge-nf-call-iptables = 1
#net.ipv4.ip_forward = 1
modprobe br_netfilter
sysctl -p /etc/sysctl.d/k8s.conf安装docker
apt-get install docker.io -y
# 设置开机启动并启动docker
sudo systemctl start docker
sudo systemctl enble docker
# 修改docker运行时,并且增加镜像
cat <<EOF | sudo tee /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"registry-mirrors": [
"https://reg-mirror.qiniu.com/"
]
"storage-driver": "overlay2"
}
EOF配置ubuntu k8s 安装源
#使得 apt 支持 ssl 传输
apt-get update && apt-get install -y apt-transport-https
#下载 gpg 密钥
curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add -
#添加 k8s 镜像源
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF
#更新
apt-get update安装 kubeadm、kubelet、kubectl
注意!这里最好是只安装 1.24之前的版本,新版本可能安装很多问题,导致无心学习,我这里选择的是1.23.10
apt list--all-versions package_name ##查看版本
apt-get install -y kubeadm=1.23.10-00 kubelet=1.23.10-00 kubectl=1.23.10-00
# 阻止自动更新(apt upgrade时忽略)。所以更新的时候先unhold，更新完再hold。
apt-mark hold kubelet kubeadm kubectl通过kubeadm 进行初始化k8s集群
kubeadm init \
--apiserver-advertise-address 192.168.192.9 \
--apiserver-bind-port 6443 \
--pod-network-cidr 10.244.0.0/16 \
--image-repository registry.aliyuncs.com/google_containers如果初始化出问题,就需要自己百度多解决了
初始化成功之后:
o/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/master:NoSchedule]
[bootstrap-token] Using token: mdutmg.pbecp9mqcowc4b0u
[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 192.168.192.9:6443 --token mdutmg.pbecp9mqcowc4b0u \
--discovery-token-ca-cert-hash sha256:61f8d9b13b94a3c7eff88e25faf1c873cfd559d1ee2f2988009ac85de11ec730保存最后的kubeadm join 代码,后面加入集群有用
查看集群是否成功部署:
kubectl get nodes如果提示:The connection to the server localhost:8080 was refused - did you specify the right host or port?
是因为没有绑定好集群环境
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> /etc/profile
source /etc/profile即可正常显示
这边可以看到,STATUS 是NotReady状态,因为还有网络插件没装
安装 Pod Network(flannel网络插件)
wget可以查看到kube-flannel的配置项
自己手动拉下镜像,避免部署的时候失败:
root@test02:/home/tioncico# docker pull docker.io/rancher/mirrored-flannelcni-flannel:v0.19.2部署flannel插件
root@test02:/home/tioncico# kubectl get pod --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-flannel kube-flannel-ds-rfx4q 1/1 Running 0 4s
kube-system coredns-6d8c4cb4d-575sw 1/1 Running 0 65m
kube-system coredns-6d8c4cb4d-p4nv8 1/1 Running 0 65m
kube-system etcd-master 1/1 Running 0 66m
kube-system kube-apiserver-master 1/1 Running 0 66m
kube-system kube-controller-manager-master 1/1 Running 0 66m
kube-system kube-proxy-n2n4n 1/1 Running 0 65m
kube-system kube-scheduler-master 1/1 Running 0 66m
kubernetes-dashboard dashboard-metrics-scraper-6f669b9c9b-86hm6 1/1 Running 0 28m
kubernetes-dashboard kubernetes-dashboard-54c5fb4776-qb2lf 1/1 Running 0 28m
root@test02:/home/tioncico#可看到nodes,pods一切正常
root@test02:/home/tioncico# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-flannel kube-flannel-ds-rfx4q 1/1 Running 0 58s
kube-system coredns-6d8c4cb4d-575sw 1/1 Running 0 66m
kube-system coredns-6d8c4cb4d-p4nv8 1/1 Running 0 66m
kube-system etcd-master 1/1 Running 0 67m
kube-system kube-apiserver-master 1/1 Running 0 67m
kube-system kube-controller-manager-master 1/1 Running 0 67m
kube-system kube-proxy-n2n4n 1/1 Running 0 66m
kube-system kube-scheduler-master 1/1 Running 0 67m
kubernetes-dashboard dashboard-metrics-scraper-6f669b9c9b-86hm6 1/1 Running 0 29m
kubernetes-dashboard kubernetes-dashboard-54c5fb4776-qb2lf 1/1 Running 0 29m
root@test02:/home/tioncico# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 67m v1.23.10
root@test02:/home/tioncico#
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