1.2Kubernetes快速入門(mén)

環(huán)境準(zhǔn)備：

關(guān)閉CentOS防火墻

?????systemctl disable firewalld

?????systemctl stop firewalld

安裝etcd和kubernetes軟件

? ? yum install -y etcd kubernetes

啟動(dòng)服務(wù)

? ? systemctl start etcd? ?(用于配置共享和服務(wù)發(fā)現(xiàn)的鍵值存儲(chǔ)系統(tǒng))

? ? systemctl start docker （創(chuàng)建容器的）

????????????????如果docker啟動(dòng)h失斚律摇（參考vi /etc/sysconfig/selinux? ?將selinux后面的改為disable,重啟服務(wù)器笛坦，再重啟docker即可）

? ? systemctl start kube-apiserver? (API Server是整個(gè)系統(tǒng)的對(duì)外接口，供客戶(hù)端和其它組件調(diào)用,相當(dāng)于“營(yíng)業(yè)廳”)

? ? systemctl start kube-controller-manager? (Controller manager負(fù)責(zé)管理控制器榔组，相當(dāng)于“大總管”左腔。)

????systemctl start kube-scheduler? ?(Scheduler負(fù)責(zé)對(duì)集群內(nèi)部的資源進(jìn)行調(diào)度餐屎，相當(dāng)于“調(diào)度室”福也。)

????systemctl start kubelet? ?(Kubelet工育，主要負(fù)責(zé)監(jiān)視指派到它所在Node上的Pod逃默，包括創(chuàng)建鹃愤、修改、監(jiān)控完域、刪除等软吐。）

? ? systemctl start kube-proxy （Kube-proxy，主要負(fù)責(zé)為Pod對(duì)象提供代理吟税。）

配置

tomcat配置：/usr/local/k8s/

mytomcat-rc.yaml

mytomcat-rc.yaml

????kubectl? create -f mytomcat-rc.yaml
mytomcat-svc.yaml

mytomcat-svc.yaml

????kubectl create -f mytomcat-svc.yaml

????kubectl get svc? :查看服務(wù)

問(wèn)題解決

docker pull 失敗

? ??1. yum install rhsm -y?

? ??2. docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest

????如果以上 兩步可以解決問(wèn)題凹耙，則不需要執(zhí)行以下步驟姿现。

????3. docker search pod-infrastructure

????4. docker pull docker.io/tianyebj/pod-infrastructure

????5. docker tag tianyebj/pod-infrastructure 192.168.0.19:5000/pod-infrastructure

????6. docker push 192.168.0.19:5000/pod-infrastructure

????7. vi /etc/kubernetes/kubelet

????修改KUBELET_POD_INFRA_CONTAINER="-pod-infra-container-image=192.168.0.19:5000/pod-infrastructure:latest"

????8. 重啟服務(wù)

????????systemctl restart kube-apiserver?

????????systemctl restart kube-controller-manager?

????????systemctl restart kube-scheduler?

????????systemctl restart kubelet?

????????systemctl restart kube-proxy

????方案二：

????1. docker pull kubernetes/pause

? ? 2. docker tag docker.io/kubernetes/pause:latest ????????192.168.0.19:5000/google_containers/pause-amd64.3.0

????3. docker push 192.168.0.19:5000/google_containers/pause-amd64.3.0

????4. vi /etc/kubernetes/kubelet配置為：

????????KUBELET_ARGS="-? pod_infra_container_image=192.168.0.19:5000/google_containers/pause-amd64.3.0"

????5. 重啟kubelet服務(wù)：systemctl restart kubelet

外網(wǎng)不能訪問(wèn)

? ? 在搭建好的k8s集群內(nèi)創(chuàng)建的容器，只能在其所在的節(jié)點(diǎn)上curl可訪問(wèn)肖抱，但是在其他任何主機(jī)上無(wú)法訪問(wèn)容器占用端口????

? ? 解決方案：

? ????? 1. vim /etc/sysctl.conf

? ????? 2. net.ipv4.ip_forward=1

kubectl get pods時(shí)No resources found問(wèn)題

? ? ????1. vim /etc/kubernetes/apiserver

? ? ? ? 2. 找到KUBE_ADMISSION_CONTROL="-admission_control=NamespaceLifecycle,NameSpaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota",去掉ServiceAccount,保存退出备典。

? ? ? ? 3. systemctl restart kube-apiserver

補(bǔ)充：

kubectl replace -f mytomcat-rc.yaml

kubectl delete svc --all

kubectl create -f mytomcat-svc.yaml