搭建K8s集群
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2022-06-12 15:24:43
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1.1 准备3台centos
大家根据自己的情况来准备centos7的虚拟机。
要保证彼此之间能够ping通,也就是处于同一个网络中,虚拟机的配置要求上面也描述咯。
1.2 更新并安装依赖
3台机器都需要执行
yum -y update
yum install -y conntrack ipvsadm ipset jq sysstat curl iptables libseccomp
1.3 安装Docker
在每一台机器上都安装好Docker,版本为18.09.0
01 安装必要的依赖 sudo yum install -y yum-utils device-mapper-persistent-data lvm2 02 设置docker仓库 sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo 【设置要设置一下阿里云镜像加速器】 登录阿里云 https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors 容器镜像服务中查看,参见下图 sudo mkdir -p /etc/docker sudo tee /etc/docker/daemon.json <<-'EOF' { "registry-mirrors": ["https://******.mirror.aliyuncs.com"] } EOF sudo systemctl daemon-reload 03 安装docker yum install -y docker-ce-18.09.0 docker-ce-cli-18.09.0 containerd.io 04 启动docker sudo systemctl start docker && sudo systemctl enable docker
1.4 修改hosts文件
(1)master
# 设置hostname
sudo hostnamectl set-hostname master
sudo hostnamectl set-hostname worker1
sudo hostnamectl set-hostname worker2
#上面操作对应虚拟机 分开执行
#修改hosts文件
vi /etc/hosts
#将下面内容加入所有虚拟机hosts文件中
192.168.0.111 master
192.168.0.112 worker1
192.168.0.113 worker2
1.5 系统基础前提配置
# (1)关闭防火墙
systemctl stop firewalld && systemctl disable firewalld
# (2)关闭selinux
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
# (3)关闭swap
swapoff -a
sed -i '/swap/s/^\(.*\)$/#\1/g' /etc/fstab
# (4)配置iptables的ACCEPT规则
iptables -F && iptables -X && iptables -F -t nat && iptables -X -t nat && iptables -P FORWARD ACCEPT
# (5)设置系统参数
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
1.6 Installing kubeadm, kubelet and kubectl
(1)配置yum源
cat <<EOF > /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
EOF
(2)安装kubeadm&kubelet&kubectl
yum install -y kubeadm kubelet kubectl -y
(3)docker和k8s设置同一个cgroup
# docker
vi /etc/docker/daemon.json
"exec-opts": ["native.cgroupdriver=systemd"],
systemctl restart docker
# kubelet,这边如果发现输出directory not exist,也说明是没问题的,大家继续往下进行即可
sed -i "s/cgroup-driver=systemd/cgroup-driver=cgroupfs/g" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
systemctl enable kubelet && systemctl start kubelet
1.7 kube init初始化master
# 此操作只在master节点执行 查看日志,记录join信息
kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.15.1 --apiserver-advertise-address 192.168.0.111 --pod-network-cidr=10.244.0.0/16
【若要重新初始化集群状态:kubeadm reset,然后再进行上述操作】
记得保存好最后kubeadm join的信息
(3)根据日志提示
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
1.8 部署calico网络插件
选择网络插件:https://kubernetes.io/docs/concepts/cluster-administration/addons/
calico网络插件:https://docs.projectcalico.org/v3.9/getting-started/kubernetes/
calico,同样在master节点上操作
# 在k8s中安装calico
kubectl apply -f https://docs.projectcalico.org/v3.9/manifests/calico.yaml
# 确认一下calico是否安装成功
kubectl get pods --all-namespaces -w
1.9 kube join
记得保存初始化master节点的最后打印信息
kubeadm join 192.168.0.111:6443 --token yu1ak0.2dcecvmpozsy8loh \
--discovery-token-ca-cert-hash sha256:********************
(1)在woker1和worker2上执行上述命令
(2)在master节点上检查集群信息
kubectl get nodes
NAME STATUS ROLES AGE VERSION
master-kubeadm-k8s Ready master 19m v1.14.0
worker01-kubeadm-k8s Ready <none> 3m6s v1.14.0
worker02-kubeadm-k8s Ready <none> 2m41s v1.14.0
1.10 创建Pod
(1)定义pod.yml文件,比如pod_nginx_rs.yaml
cat > pod_nginx_rs.yaml <<EOF
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: nginx
labels:
tier: frontend
spec:
replicas: 3
selector:
matchLabels:
tier: frontend
template:
metadata:
name: nginx
labels:
tier: frontend
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
EOF
(2)根据pod_nginx_rs.yml文件创建pod
kubectl apply -f pod_nginx_rs.yaml
(3)查看pod
kubectl get pods
kubectl get pods -o wide
kubectl describe pod nginx
(4)通过rs将pod扩容
kubectl scale rs nginx --replicas=5
kubectl get pods -o wide
(5)删除pod
kubectl delete -f pod_nginx_rs.yaml