k8s集群部署的时候会遇到很多的坑，即使看网上的文档也可能遇到各种的坑。
安装准备
1、虚拟机两台（ip按自己的网络环境相应配置）(master/node)
192.168.100.215 k8s-master
192.168.100.216 k8s-node1
2、关闭防火墙(master/node)
systemctl stop firewalld
systemctl disable firewalld
3、关闭selinux(master/node)
setenforce 0 # 临时关闭
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config # 永久关闭
4、关闭swap(master/node)
swapoff -a # 临时关闭；关闭swap主要是为了性能考虑
free # 可以通过这个命令查看swap是否关闭了
sed -ri 's/.swap. /#&/' /etc/fstab # 永久关闭
5、添加主机名与IP对应的关系(master/node)
$ vim /etc/hosts
#添加如下内容：
192.168.100.215 k8s-master
192.168.100.216 k8s-node1
#保存退出
6、修改主机名(master/node)
#k8s-master
root@localhost \~\] hostname localhost.localdomain \[root@localhost \~\] hostname k8s-master ##临时生效 \[root@localhost \~\] hostnamectl set-hostname k8s-master ##重启后永久生效 #k8s-node1 \[root@localhost \~\] hostname localhost.localdomain \[root@localhost \~\] hostname k8s-node1 ##临时生效 \[root@localhost \~\] hostnamectl set-hostname k8s-node1 ##重启后永久生效 7、桥接设置(master/node) $ cat \> /etc/sysctl.d/k8s.conf \<\< EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF $ sysctl --system p.s. 以上几步最好照着都执行一下，以免后面报一大堆错。 ### 安装docker 这一步需要注意docker版本与k8s版本对照关系，否则执行master初始化的时候会报错。 ### 部署Kubernetes (master) kubeadm init kubeadm init --apiserver-advertise-address=192.168.100.215 --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.18.0 --service-cidr=10.1.0.0/16 --pod-network-cidr=10.244.0.0/16 执行命令会出现可能一些告警，需要处理一下 #### cgroupfs切换为systemd \[WARNING IsDockerSystemdCheck\]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/ 解决方案： 新建daemon.json切换为systemd mkdir /etc/docker/ cat \> /etc/docker/daemon.json \<\< EOF { "registry-mirrors": \["https://gqs7xcfd.mirror.aliyuncs.com","https://hub-mirror.c.163.com"\], "exec-opts": \["native.cgroupdriver=systemd"\], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2" } EOF #### Docker 与k8s版本不兼容 \[WARNING SystemVerification\]: this Docker version is not on the list of validated versions: 24.0.7. Latest validated version: 19.03 解决方案： 删除旧版本的docker sudo yum remove docker-ce sudo rm -rf /var/lib/docker 安装兼容版本的docker yum -y install docker-ce-19.03.9-3.el7 docker-ce-cli-19.03.9-3.el7 systemctl enable docker systemctl start docker ### 在两台Node节点上执行join命令 kubeadm join 192.168.200.128:6443 --token 29f2jw.4lczl18ymfnzcax7 --discovery-token-ca-cert-hash sha256:57e05025b3a40415cd9297e089f0439f265a6e5df46ff1b431e017f326b313 #### cannot stat '/etc/kubernetes/admin.conf' 从master节点拷贝过来。 ```bash # master节点执行 [root@master ~]# scp /etc/kubernetes/admin.conf root@192.168.247.137:/etc/kubernetes/admin.conf The authenticity of host '192.168.247.137 (192.168.247.137)' can't be established. ECDSA key fingerprint is SHA256:oj2gG+nDvkzbS+IggsOxKVwMTVP2zxClBoNEPXmHvzk. ECDSA key fingerprint is MD5:fa:f6:9a:89:1a:4a:54:63:fe:3d:70:88:c4:a4:4d:ea. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.247.137' (ECDSA) to the list of known hosts. root@192.168.247.137's password: admin.conf 100% 5451 3.5MB/s 00:00 # node节点执行 [root@slave2 ~]# echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile [root@slave2 ~]# source ~/.bash_profile [root@slave2 ~]# chown $(id -u):$(id -g) $HOME/.kube/config # 验证 [root@slave2 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE nginx-6867cdf567-vkf99 1/1 Running 0 6m38s ``` #### node节点 kubectl get nodes 报错 error: no configuration has been provided, try setting KUBERNETES_MASTER environment variable ```bash [root@localhost ~]# kubectl get nodes error: no configuration has been provided, try setting KUBERNETES_MASTER environment variable ``` 解决方案 ```bash [root@localhost ~]# find / -name admin.conf /etc/kubernetes/admin.conf [root@localhost ~]# mkdir -p $HOME/.kube [root@localhost ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config [root@localhost ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config ``` ### 删除pod service deployment 删除service kubectl delete deployment grafana -n kube-system kubectl delete service grafana -n kube-system kubectl delete serviceaccount grafana -n kube-system kubectl delete serviceaccount grafana -n kube-system --force --grace-period=0 查看 kubectl get pods,deployments,services,serviceaccounts -n kube-system | grep grafana 删除 deployment kubectl delete deployment monitoring-grafana -n kube-system kubectl delete pod monitoring-grafana-b46f4c778-z74wg -n kube-system