Kubernetes的整体架构如下：
Master为主控节点，上面运行apiserver，scheduler，controller-manager等组件。Minion相当于工作节点，上面运行kubelet，proxy，cAdvisor以及最重要的docker等组件。下面来实际部署一下这套集群管理工具。
环境
yy1 10.193.6.35
yy2 10.193.6.36
yy1作为master，yy2作为minion。
# cat /etc/centos-release
CentOS Linux release 7.0.1406 (Core)
安装kubernetes
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# curl https://copr.fedoraproject.org/coprs/eparis/kubernetes-epel-7/repo/epel-7/eparis-kubernetes-epel-7-epel-7.repo -o /etc/yum.repos.d/eparis-kubernetes-epel-7-epel-7.repo# yum install kubernetes -y |
配置yy1
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# cat /etc/kubernetes/apiserver#### kubernetes system config## The following values are used to configure the kubernetes-apiserver# # The address on the local server to listen to.KUBE_API_ADDRESS="10.193.6.35" # The port on the local server to listen on.KUBE_API_PORT="8080" # How the replication controller and scheduler find the apiserverKUBE_MASTER="10.193.6.35:8080" # Comma seperated list of minionsMINION_ADDRESSES="10.193.6.36" # Port minions listen onMINION_PORT="10250" # cat /etc/kubernetes/config#### kubernetes system config## The following values are used to configure various aspects of all# kubernetes services, including## kubernetes-apiserver.service# kubernetes-controller-manager.service# kubernetes-kubelet.service# kubernetes-proxy.service # Comma seperated list of nodes in the etcd clusterKUBE_ETCD_SERVERS="http://10.193.6.35:4001" # logging to stderr means we get it in the systemd journalKUBE_LOGTOSTDERR="true" # journal message level, 0 is debugKUBE_LOG_LEVEL=0 # Should this cluster be allowed to run privleged docker containersKUBE_ALLOW_PRIV="true" |
启动yy1上相关服务
master上需要运行etcd，kube-apiserver，kube-controller-manager，kube-scheduler这4个进程。
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for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES systemctl enable $SERVICES systemctl status $SERVICESdone |
配置yy2
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# cat /etc/kubernetes/kubelet#### kubernetes kublet (minion) config # The address for the info server to serve onMINION_ADDRESS="10.193.6.36" # The port for the info server to serve onMINION_PORT="10250"# You may leave this blank to use the actual hostnameMINION_HOSTNAME="10.193.6.36"# cat /etc/kubernetes/config #### kubernetes system config## The following values are used to configure various aspects of all# kubernetes services, including## kubernetes-apiserver.service# kubernetes-controller-manager.service# kubernetes-kubelet.service# kubernetes-proxy.service# Comma seperated list of nodes in the etcd clusterKUBE_ETCD_SERVERS="http://10.193.6.35:4001" # logging to stderr means we get it in the systemd journalKUBE_LOGTOSTDERR="true"# journal message level, 0 is debugKUBE_LOG_LEVEL=0# Should this cluster be allowed to run privleged docker containersKUBE_ALLOW_PRIV="true" |
修改yy2 kubelet的配置
CentOS7上没有docker.socket服务，注释掉kubelet中对docker.socket的依赖。
/usr/lib/systemd/system/kubelet.service
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[Unit]Description=Kubernetes Kubelet#After=docker.socket cadvisor.serviceAfter=cadvisor.service#Requires=docker.socket cadvisor.serviceRequires=cadvisor.service |
启动yy2上的相关服务
minion上需要运行kube-proxy，kubelet以及docker。
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for SERVICES in kube-proxy kubelet docker; do systemctl restart $SERVICES systemctl enable $SERVICES systemctl status $SERVICES done |
创建pod描述文件
创建一个apache的pod描述文件。
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# cat apache.json{ "id": "apache", "desiredState": { "manifest": { "version": "v1beta1", "id": "apache-1", "containers": [{ "name": "master", "image": "fedora/apache", "ports": [{ "containerPort": 80, "hostPort": 80 }] }] } }, "labels": { "name": "apache" }} |
创建pod
通过客户端工具kubecfg提交任务给apiserver，由scheduler选择一个minion部署容。
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[root@yy1 ~]# kubecfg -c apache.json create podsI0925 06:43:26.768122 09313 request.go:292] Waiting for completion of /operations/1ID Image(s) Host Labels Status---------- ---------- ---------- ---------- ----------apache fedora/apache / name=apache Waiting [root@yy1 ~]# kubecfg list pods ID Image(s) Host Labels Status---------- ---------- ---------- ---------- ----------apache fedora/apache 10.193.6.36/ name=apache Waiting |
apache服务会自动部署到机器yy2，yy2上的docker会自动下载image，然后启动apache服务。顺利的话，过一会儿，apache服务就会在yy2上起来。
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[root@yy1 ~]# kubecfg list pods ID Image(s) Host Labels Status---------- ---------- ---------- ---------- ----------apache fedora/apache 10.193.6.36/ name=apache Running |
可以尝试访问一下，
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/hustcat/p/3993712.html
