标签:red 安装docker 测试 upd lin 服务配置 ica contain readonly
记录和分享使用二进制搭建K8S集群的详细过程,由于操作比较冗长,大概会分四篇写完:
K8S的Node上需要运行kubelet和kube-proxy。本篇介绍在Node机器安装这两个组件,除此之外,安装通信需要的cni插件。
本篇的执行命令需要在准备的两台Node机器上执行。
可以参照官网:https://docs.docker.com/engine/install/
# 卸载老版本或重装docker时执行第一行
yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine -y
# 安装docker
yum install -y yum-utils
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install docker-ce docker-ce-cli containerd.io -y
# 查看Docker版本
docker version
启动Docker
systemctl enable docker
systemctl start docker
cd /root/kubernetes/resources
tar -zxvf ./kubernetes-node-linux-amd64.tar.gz
mkdir /etc/kubernetes/{ssl,bin} -p
cp kubernetes/node/bin/kubelet ./kubernetes/node/bin/kube-proxy /etc/kubernetes/bin
cd /etc/kubernetes
准备kubelet配置文件
vim kubelet
执行上行命令,在k8s-node01写入文件内容如下:
KUBELET_ARGS="--logtostderr=false --v=2 --log-dir=/var/log/kubernetes --enable-server=true --kubeconfig=/etc/kubernetes/kubelet.kubeconfig --hostname-override=k8s-node01 --network-plugin=cni --bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig --config=/etc/kubernetes/kubelet-config.yml --cert-dir=/etc/kubernetes/ssl"
在k8s-node02写入文件内容如下:
KUBELET_ARGS="--logtostderr=false --v=2 --log-dir=/var/log/kubernetes --enable-server=true --kubeconfig=/etc/kubernetes/kubelet.kubeconfig --hostname-override=k8s-node02 --network-plugin=cni --bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig --config=/etc/kubernetes/kubelet-config.yml --cert-dir=/etc/kubernetes/ssl"
准备bootstrap.kubeconfig文件
vim /etc/kubernetes/bootstrap.kubeconfig
执行上行命令,写入文件内容如下:
apiVersion: v1
clusters:
- cluster:
certificate-authority: /etc/kubernetes/ssl/ca.pem
server: https://192.168.115.131:6443
name: kubernetes
contexts:
- context:
cluster: kubernetes
user: kubelet-bootstrap
name: default
current-context: default
kind: Config
preferences: {}
users:
- name: kubelet-bootstrap
user:
token: d5c5d767b64db39db132b433e9c45fbc
注意:token的值需要替换为master生成的token.csv中所用的token。
准备kubelet-config.yml文件
vim kubelet-config.yml
执行上行命令,写入文件内容如下:
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local
failSwapOn: false
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/ssl/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110
准备kubelet.kubeconfig文件
vim kubelet.kubeconfig
执行上行命令,写入文件内容如下:
kubelet.kubeconfig
apiVersion: v1
clusters:
- cluster:
certificate-authority: /etc/kubernetes/ssl/ca.pem
server: https://192.168.115.131:6443
name: kubernetes
contexts:
- context:
cluster: kubernetes
namespace: default
user: default-auth
name: default-context
current-context: default-context
kind: Config
preferences: {}
users:
- name: default-auth
user:
client-certificate: /etc/kubernetes/ssl/kubelet-client-current.pem
client-key: /etc/kubernetes/ssl/kubelet-client-current.pem
准备kubelet服务配置文件
vim /usr/lib/systemd/system/kubelet.service
执行上行命令,写入文件内容如下:
[Unit]
Description=Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service
[Service]
EnvironmentFile=/etc/kubernetes/kubelet
ExecStart=/etc/kubernetes/bin/kubelet $KUBELET_ARGS
Restart=on-failure
[Install]
WantedBy=multi-user.target
启动kubelet:
systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet
systemctl status kubelet
给Node颁发证书,在Master上执行:
kubectl get csr
# 输出如下
NAME AGE SIGNERNAME REQUESTOR CONDITION
node-csr-a-BmW9xMglOXlUdwBjD2QQphXLdu4iwtamEIIbhJKcY 10m kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending
node-csr-zDDrVyKH7ug8fTUcDjdvDgh-f9rVCyoHuLMGaWbykAQ 10m kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending
得到证书的NAME,给其Approve:
kubectl certificate approve node-csr-a-BmW9xMglOXlUdwBjD2QQphXLdu4iwtamEIIbhJKcY
kubectl certificate approve node-csr-zDDrVyKH7ug8fTUcDjdvDgh-f9rVCyoHuLMGaWbykAQ
再次查看证书,证书的CONDITION就会更新了
kubectl get csr
# 输出如下
NAME AGE SIGNERNAME REQUESTOR CONDITION
node-csr-a-BmW9xMglOXlUdwBjD2QQphXLdu4iwtamEIIbhJKcY 10m kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Approved,Issued
node-csr-zDDrVyKH7ug8fTUcDjdvDgh-f9rVCyoHuLMGaWbykAQ 10m kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Approved,Issued
接下来使用查看Node的命令,应该可以获取到Node信息:
kubectl get node
# 输出如下
NAME STATUS ROLES AGE VERSION
k8s-node01 NotReady <none> 50s v1.18.3
k8s-node02 NotReady <none> 56s v1.18.3
准备kube-proxy配置文件
vim kube-proxy
执行上行命令,写入文件内容如下:
KUBE_PROXY_ARGS="--logtostderr=false --v=2 --log-dir=/var/log/kubernetes --config=/etc/kubernetes/kube-proxy-config.yml"
准备kube-proxy-config.yml文件
vim /etc/kubernetes/kube-proxy-config.yml
执行上行命令,在k8s-node01写入文件内容如下:
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
address: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
iclientConnection:
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
hostnameOverride: k8s-node01
clusterCIDR: 10.0.0.0/24
mode: ipvs
ipvs:
i scheduler: "rr"
iptables:
masqueradeAll: true
在k8s-node02写入文件内容如下:
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
address: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
clientConnection:
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
hostnameOverride: k8s-node01
clusterCIDR: 10.0.0.0/24
mode: ipvs
ipvs:
scheduler: "rr"
iptables:
masqueradeAll: true
准备kube-proxy.kubeconfig文件
vim /etc/kubernetes/kube-proxy.kubeconfig
执行上行命令,写入文件内容如下:
apiVersion: v1
clusters:
- cluster:
certificate-authority: /etc/kubernetes/ssl/ca.pem
server: https://192.168.115.131:6443
name: kubernetes
contexts:
- context:
cluster: kubernetes
user: kube-proxy
name: default
current-context: default
kind: Config
preferences: {}
users:
- name: kube-proxy
user:
client-certificate: /etc/kubernetes/ssl/kube-proxy.pem
client-key: /etc/kubernetes/ssl/kube-proxy-key.pem
准备kube-proxy服务配置文件
vim /usr/lib/systemd/system/kube-proxy.service
执行上行命令,写入文件内容如下:
[Unit]
Description=Kube-Proxy
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
Requires=network.target
[Service]
EnvironmentFile=/etc/kubernetes/kube-proxy
ExecStart=/etc/kubernetes/bin/kube-proxy $KUBE_PROXY_ARGS
Restart=on-failure
[Install]
WantedBy=multi-user.target
启动kubelet:
systemctl daemon-reload
systemctl start kube-proxy
systemctl enable kube-proxy
systemctl status kube-proxy
cd /root/kubernetes/resources
mkdir -p /opt/cni/bin /etc/cni/net.d
tar -zxvf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin
需要在Master机器上执行
cd /root/kubernetes/resources
kubectl apply -f kube-flannel.yml
创建角色绑定
kubectl create clusterrolebinding kube-apiserver:kubelet-apis --clusterrole=system:kubelet-api-admin --user kubernetes
部署一个nginx的deployment:
kubectl create deployment nginx --image=nginx
# 在等待几秒后,获取deployment
kubectl get deployment
ifconfig cni0
kubectl expose deployment nginx --port=80 --type=NodePort
kubectl get svc
可以看到nginx已经启动成功。
NAME READY UP-TO-DATE AVAILABLE AGE
nginx 1/1 1 1 7m7s
注意:如果启动失败,可能是由于网络原因拉取镜像失败导致。可以通过kubectl describe pod
查看。
使用service暴露K8S集群内部Pod服务:
kubectl expose deployment nginx --port=80 --type=NodePort
# 获取service
kubectl get svc
可以看到,service将nginx的服务转发到了31839端口
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 10h
nginx NodePort 10.0.0.101 <none> 80:31839/TCP 10s
此时,我们在Node机器上使用该端口访问nginx,可以看到成功访问。
[root@k8s-node01]# curl 192.168.115.132:31839
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
好了,至此第四段落部署Node也顺利结束。
在使用二进制搭建K8S集群的过程中,搭建的过程参考了很多园友的博客。由于我是使用最新的K8S、etcd版本搭建的,遇到了很多的问题,但没有关系,好事多磨。
在遇到问题的时候,几乎都是通过查看K8S中组件的运行状态和日志来寻找问题根源和解决方案的。
大部分问题都是出在配置方面,或是文件路径配置问题,或是新版本的配置不兼容问题。
Kubernetes 0-1 二进制搭建K8S(四)部署Node
标签:red 安装docker 测试 upd lin 服务配置 ica contain readonly
原文地址:https://www.cnblogs.com/Med1tator/p/12989467.html