Loading... <p> <strong>一、前言</strong><br /> Kubernetes 是Google开源的容器集群管理系统,基于Docker构建一个容器的调度服务,提供资源调度、均衡容灾、服务注册、动态扩缩容等功能套件,目前最新版本为0.6.2。本文介绍如何基于Centos7.0构建Kubernetes平台,在正式介绍之前,大家有必要先理解Kubernetes几个核心概念及其承担的功能。以下为Kubernetes的架构设计图:<br /> <img alt="" src="//cto.wang/usr/uploads/2016/07/20160703180100-56.jpg" /><br /> 1. Pods<br /> 在Kubernetes系统中,调度的最小颗粒不是单纯的容器,而是抽象成一个Pod,Pod是一个可以被创建、销毁、调度、管理的最小的部署单元。比如一个或一组容器。<br /> 2. Replication Controllers<br /> Replication Controller是Kubernetes系统中最有用的功能,实现复制多个Pod副本,往往一个应用需要多个Pod来支撑,并且可以保证其复制的副本数,即使副本所调度分配的主宿机出现异常,通过Replication Controller可以保证在其它主宿机启用同等数量的Pod。Replication Controller可以通过repcon模板来创建多个Pod副本,同样也可以直接复制已存在Pod,需要通过Label selector来关联。<br /> 3、Services<br /> Services是Kubernetes最外围的单元,通过虚拟一个访问IP及服务端口,可以访问我们定义好的Pod资源,目前的版本是通过iptables的nat转发来实现,转发的目标端口为Kube_proxy生成的随机端口,目前只提供GOOGLE云上的访问调度,如GCE。如果与我们自建的平台进行整合?请关注下篇《kubernetes与HECD架构的整合》文章。<br /> 4、Labels<br /> Labels是用于区分Pod、Service、Replication Controller的key/value键值对,仅使用在Pod、Service、 Replication Controller之间的关系识别,但对这些单元本身进行操作时得使用name标签。<br /> 5、Proxy<br /> Proxy不但解决了同一主宿机相同服务端口冲突的问题,还提供了Service转发服务端口对外提供服务的能力,Proxy后端使用了随机、轮循负载均衡算法。</p> <p> 说说个人一点看法,目前Kubernetes 保持一周一小版本、一个月一大版本的节奏,迭代速度极快,同时也带来了不同版本操作方法的差异,另外官网文档更新速度相对滞后及欠缺,给初学者带来一定挑战。在上游接入层官方侧重点还放在GCE(Google Compute Engine)的对接优化,针对个人私有云还未推出一套可行的接入解决方案。在v0.5版本中才引用service代理转发的机制,且是通过iptables来实现,在高并发下性能令人担忧。但作者依然看好Kubernetes未来的发展,至少目前还未看到另外一个成体系、具备良好生态圈的平台,相信在V1.0时就会具备生产环境的服务支撑能力。</p> <p><strong>一、环境部署</strong><br /> 1、平台版本说明<br /> 1)Centos7.0 OS<br /> 2)Kubernetes V0.6.2<br /> 3)etcd version 0.4.6<br /> 4)Docker version 1.3.2</p> <p>2、平台环境说明<br /> <img alt="" src="//cto.wang/usr/uploads/2016/07/20160703180100-48.jpg" /></p> <p>3、环境安装<br /> 1)系统初始化工作(所有主机)<br /> 系统安装-选择[最小化安装]<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># yum -y install wget ntpdate bind-utils # wget http://mirror.centos.org/centos/7/extras/x86_64/Packages/epel-release-7-2.noarch.rpm # yum update </pre> <p> </p></div> </div> <p> CentOS 7.0默认使用的是firewall作为防火墙,这里改为iptables防火墙(熟悉度更高,非必须)。<br /> 1.1、关闭firewall:<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># systemctl stop firewalld.service #停止firewall # systemctl disable firewalld.service #禁止firewall开机启动 </pre> <p> </p></div> </div> <p> 1.2、安装iptables防火墙<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># yum install iptables-services #安装 # systemctl start iptables.service #最后重启防火墙使配置生效 # systemctl enable iptables.service #设置防火墙开机启动 </pre> <p> </p></div> </div> <p> 2)安装Etcd(192.168.1.10主机)<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># mkdir -p /home/install && cd /home/install # wget https://github.com/coreos/etcd/releases/download/v0.4.6/etcd-v0.4.6-linux-amd64.tar.gz # tar -zxvf etcd-v0.4.6-linux-amd64.tar.gz # cd etcd-v0.4.6-linux-amd64 # cp etcd* /bin/ # /bin/etcd -version etcd version 0.4.6 </pre> <p> </p></div> </div> <p> 启动服务etcd服务,如有提供第三方管理需求,另需在启动参数中添加“-cors=’*’”参数。<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># mkdir /data/etcd # /bin/etcd -name etcdserver -peer-addr 192.168.1.10:7001 -addr 192.168.1.10:4001 -data-dir /data/etcd -peer-bind-addr 0.0.0.0:7001 -bind-addr 0.0.0.0:4001 & </pre> </p></div> </div> <p> 配置etcd服务防火墙,其中4001为服务端口,7001为集群数据交互端口。<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># iptables -I INPUT -s 192.168.1.0/24 -p tcp --dport 4001 -j ACCEPT # iptables -I INPUT -s 192.168.1.0/24 -p tcp --dport 7001 -j ACCEPT </pre> <p> </p></div> </div> <p> 3)安装Kubernetes(涉及所有Master、Minion主机)<br /> 通过yum源方式安装,默认将安装etcd, docker, and cadvisor相关包。<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># 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 -y install kubernetes </pre> <p> </p></div> </div> <p> 升级至v0.6.2,覆盖bin文件即可,方法如下:<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># mkdir -p /home/install && cd /home/install # wget https://github.com/GoogleCloudPlatform/kubernetes/releases/download/v0.6.2/kubernetes.tar.gz # tar -zxvf kubernetes.tar.gz # tar -zxvf kubernetes/server/kubernetes-server-linux-amd64.tar.gz # cp kubernetes/server/bin/kube* /usr/bin </pre> <p> </p></div> </div> <p> 校验安装结果,出版以下信息说明安装正常。<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh">[root@SN2014-12-200 bin]# /usr/bin/kubectl version Client Version: version.Info{Major:"0", Minor:"6+", GitVersion:"v0.6.2", GitCommit:"729fde276613eedcd99ecf5b93f095b8deb64eb4", GitTreeState:"clean"} Server Version: &version.Info{Major:"0", Minor:"6+", GitVersion:"v0.6.2", GitCommit:"729fde276613eedcd99ecf5b93f095b8deb64eb4", GitTreeState:"clean"} </pre> <p> </p></div> </div> <p> 4)Kubernetes配置(仅Master主机)<br /> master运行三个组件,包括apiserver、scheduler、controller-manager,相关配置项也只涉及这三块。</p> <p> 4.1、【/etc/kubernetes/config】 </p> <p> </p> <pre class="prettyprint lang-js"># Comma seperated list of nodes in the etcd cluster KUBE_ETCD_SERVERS="--etcd_servers=http://192.168.1.10:4001" # logging to stderr means we get it in the systemd journal KUBE_LOGTOSTDERR="--logtostderr=true" # journal message level, 0 is debug KUBE_LOG_LEVEL="--v=0" # Should this cluster be allowed to run privleged docker containers KUBE_ALLOW_PRIV="--allow_privileged=false" </pre> <p> </p> <div class="dp-highlighter"> <div class="bar"> <div style="color:silver" class="tools"> </div> </p></div> </div> <p>4.2、【/etc/kubernetes/apiserver】</p> <div class="dp-highlighter"> <div class="bar"> <div style="color:silver" class="tools"> <pre class="prettyprint lang-bsh"> <pre class="prettyprint lang-bsh">view plainprint? # The address on the local server to listen to. KUBE_API_ADDRESS="--address=0.0.0.0" # The port on the local server to listen on. KUBE_API_PORT="--port=8080" # How the replication controller and scheduler find the kube-apiserver KUBE_MASTER="--master=192.168.1.200:8080" # Port minions listen on KUBELET_PORT="--kubelet_port=10250" # Address range to use for services KUBE_SERVICE_ADDRESSES="--portal_net=10.254.0.0/16" # Add you own! KUBE_API_ARGS="" </pre> <p>4.3、【/etc/kubernetes/controller-manager】 </div> </p></div> </div> <div class="dp-highlighter"> <div class="bar"> <div style="color:silver" class="tools"> </p> <pre class="prettyprint lang-bsh">view plainprint? # Comma seperated list of minions KUBELET_ADDRESSES="--machines= 192.168.1.201,192.168.1.202" # Add you own! KUBE_CONTROLLER_MANAGER_ARGS="" </pre> <p> </div> </p></div> </div> <p>4.4、【/etc/kubernetes/scheduler】</p> <div class="dp-highlighter"> <div class="bar"> <div style="color:silver" class="tools"> </p> <pre class="prettyprint lang-bsh">view plainprint? # Add your own! KUBE_SCHEDULER_ARGS="" </pre> <p> </div> </p></div> </div> <p> 启动master侧相关服务<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># systemctl daemon-reload # systemctl start kube-apiserver.service kube-controller-manager.service kube-scheduler.service # systemctl enable kube-apiserver.service kube-controller-manager.service kube-scheduler.service </pre> </p></div> </div> <p> 5)Kubernetes配置(仅minion主机)<br /> minion运行两个组件,包括kubelet、proxy,相关配置项也只涉及这两块。<br /> Docker启动脚本更新<br /> # vi /etc/sysconfig/docker<br /> 添加:-H tcp://0.0.0.0:2375,最终配置如下,以便以后提供远程API维护。<br /> OPTIONS=–selinux-enabled -H tcp://0.0.0.0:2375 -H fd://</p> <p> 修改minion防火墙配置,通常master找不到minion主机多半是由于端口没有连通。<br /> iptables -I INPUT -s 192.168.1.200 -p tcp –dport 10250 -j ACCEPT</p> <p> 修改kubernetes minion端配置,以192.168.1.201主机为例,其它minion主机同理。<br /> 5.1、【/etc/kubernetes/config】</p> <div class="dp-highlighter"> <div class="bar"> <div style="color:silver" class="tools"> </p> <pre class="prettyprint lang-bsh">view plainprint? # Comma seperated list of nodes in the etcd cluster KUBE_ETCD_SERVERS="--etcd_servers=http://192.168.1.10:4001" # logging to stderr means we get it in the systemd journal KUBE_LOGTOSTDERR="--logtostderr=true" # journal message level, 0 is debug KUBE_LOG_LEVEL="--v=0" # Should this cluster be allowed to run privleged docker containers KUBE_ALLOW_PRIV="--allow_privileged=false" </pre> <p> </div> </p></div> </div> <p>5.2、【/etc/kubernetes/kubelet】</p> <div class="dp-highlighter"> <div class="bar"> <div style="color:silver" class="tools"> </p> <pre class="prettyprint lang-bsh">view plainprint? ### # kubernetes kubelet (minion) config # The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces) KUBELET_ADDRESS="--address=0.0.0.0" # The port for the info server to serve on KUBELET_PORT="--port=10250" # You may leave this blank to use the actual hostname KUBELET_HOSTNAME="--hostname_override=192.168.1.201" # Add your own! KUBELET_ARGS="" </pre> <p> </div> </p></div> </div> <p>5.3、【/etc/kubernetes/proxy】</p> <div class="dp-highlighter"> <div class="bar"> <div style="color:silver" class="tools"> </p> <pre class="prettyprint lang-bsh">view plainprint? KUBE_PROXY_ARGS="" </pre> <p> </div> </p></div> </div> <p>启动kubernetes服务<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> </p> <pre class="prettyprint lang-bsh"># systemctl daemon-reload # systemctl enable docker.service kubelet.service kube-proxy.service # systemctl start docker.service kubelet.service kube-proxy.service </pre> </p></div> </div> <p>3、校验安装(在master主机操作,或可访问master主机8080端口的client api主机)<br /> 1) kubernetes常用命令<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> </p> <pre class="prettyprint lang-bsh"># kubectl get minions #查查看minion主机 # kubectl get pods #查看pods清单 # kubectl get services 或 kubectl get services -o json #查看service清单 # kubectl get replicationControllers #查看replicationControllers清单 # for i in `kubectl get pod|tail -n +2|awk '{print $1}'`; do kubectl delete pod $i; done #删除所有pods </pre> </p></div> </div> <p> 或者通过Server api for REST方式(推荐,及时性更高):<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> </p> <pre class="prettyprint lang-bsh"># curl -s -L http://192.168.1.200:8080/api/v1beta1/version | python -mjson.tool #查看kubernetes版本 # curl -s -L http://192.168.1.200:8080/api/v1beta1/pods | python -mjson.tool #查看pods清单 # curl -s -L http://192.168.1.200:8080/api/v1beta1/replicationControllers | python -mjson.tool #查看replicationControllers清单 # curl -s -L http://192.168.1.200:8080/api/v1beta1/minions | python -m json.tool #查查看minion主机 # curl -s -L http://192.168.1.200:8080/api/v1beta1/services | python -m json.tool #查看service清单 </pre> </p></div> </div> <p><span style="color:#DC143C">注:在新版kubernetes中,所有的操作命令都整合至kubectl,包括kubecfg、kubectl.sh、kubecfg.sh等</span></p> <p> 2)创建测试pod单元<br /> </p> <pre class="prettyprint lang-bsh"># /home/kubermange/pods && cd /home/kubermange/pods # vi apache-pod.json view plainprint? { "id": "fedoraapache", "kind": "Pod", "apiVersion": "v1beta1", "desiredState": { "manifest": { "version": "v1beta1", "id": "fedoraapache", "containers": [{ "name": "fedoraapache", "image": "fedora/apache", "ports": [{ "containerPort": 80, "hostPort": 8080 }] }] } }, "labels": { "name": "fedoraapache" } } # kubectl create -f apache-pod.json # kubectl get pod </pre> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> NAME IMAGE(S) HOST LABELS STATUS<br /> fedoraapache fedora/apache 192.168.1.202/ name=fedoraapache Running </div> </div> <p> 启动浏览器访问http://192.168.1.202:8080/,对应的服务端口切记在iptables中已添加。效果图如下:<br /> <br /> 观察kubernetes在etcd中的数据存储结构<br /> <img alt="" src="//cto.wang/usr/uploads/2016/07/20160703180100-88.jpg" /></p> <p> 观察单个pods的数据存储结构,以json的格式存储。<br /> <img alt="" src="//cto.wang/usr/uploads/2016/07/20160703180100-32.jpg" /></p> <p><strong>二、实战操作</strong><br /> 任务:通过Kubernetes创建一个LNMP架构的服务集群,以及观察其负载均衡,涉及镜像“yorko/webserver”已经push至registry.hub.docker.com,大家可以通过“docker pull yorko/webserver”下载。<br /> </p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> <br /> </p> <pre class="prettyprint lang-bsh"># mkdir -p /home/kubermange/replication && mkdir -p /home/kubermange/service # cd /home/kubermange/replication </pre> </p></div> </div> <p>1、 创建一个replication ,本例直接在replication模板中创建pod并复制,也可独立创建pod再通过replication来复制。<br /> 【replication/lnmp-replication.json】</p> <div class="dp-highlighter"> <div class="bar"> <div style="color:silver" class="tools"> </p> <pre class="prettyprint lang-bsh">view plainprint? { "id": "webserverController", "kind": "ReplicationController", "apiVersion": "v1beta1", "labels": {"name": "webserver"}, "desiredState": { "replicas": 2, "replicaSelector": {"name": "webserver_pod"}, "podTemplate": { "desiredState": { "manifest": { "version": "v1beta1", "id": "webserver", "volumes": [ {"name":"httpconf", "source":{"hostDir":{"path":"/etc/httpd/conf"}}}, {"name":"httpconfd", "source":{"hostDir":{"path":"/etc/httpd/conf.d"}}}, {"name":"httproot", "source":{"hostDir":{"path":"/data"}}} ], "containers": [{ "name": "webserver", "image": "yorko/webserver", "command": ["/bin/sh", "-c", "/usr/bin/supervisord -c /etc/supervisord.conf"], "volumeMounts": [ {"name":"httpconf", "mountPath":"/etc/httpd/conf"}, {"name":"httpconfd", "mountPath":"/etc/httpd/conf.d"}, {"name":"httproot", "mountPath":"/data"} ], "cpu": 100, "memory": 50000000, "ports": [{ "containerPort": 80, },{ "containerPort": 22, }] }] } }, "labels": {"name": "webserver_pod"}, }, } } </pre> <p> </div> </p></div> </div> <p> 执行创建命令<br /> #kubectl create -f lnmp-replication.json<br /> 观察生成的pod副本清单:<br /> [root@SN2014-12-200 replication]# kubectl get pod</p> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> </p> <pre class="prettyprint lang-bsh">NAME IMAGE(S) HOST LABELS STATUS 84150ab7-89f8-11e4-970d-000c292f1620 yorko/webserver 192.168.1.202/ name=webserver_pod Running 84154ed5-89f8-11e4-970d-000c292f1620 yorko/webserver 192.168.1.201/ name=webserver_pod Running 840beb1b-89f8-11e4-970d-000c292f1620 yorko/webserver 192.168.1.202/ name=webserver_pod Running 84152d93-89f8-11e4-970d-000c292f1620 yorko/webserver 192.168.1.202/ name=webserver_pod Running 840db120-89f8-11e4-970d-000c292f1620 yorko/webserver 192.168.1.201/ name=webserver_pod Running 8413b4f3-89f8-11e4-970d-000c292f1620 yorko/webserver 192.168.1.201/ name=webserver_pod Running </pre> </p></div> </div> <p>2、创建一个service,通过selector指定 “name”: “webserver_pod”与pods关联。</p> <pre class="prettyprint lang-bsh">【service/lnmp-service.json】 view plainprint? { "id": "webserver", "kind": "Service", "apiVersion": "v1beta1", "selector": { "name": "webserver_pod", }, "protocol": "TCP", "containerPort": 80, "port": 8080 } 执行创建命令: # kubectl create -f lnmp-service.json 登录minion主机(192.168.1.201),查询主宿机生成的iptables 转发规则(最后一行) # iptables -nvL -t nat </pre> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> </p> <pre class="prettyprint lang-bsh">Chain KUBE-PROXY (2 references) pkts bytes target prot opt in out source destination 2 120 REDIRECT tcp -- * * 0.0.0.0/0 10.254.102.162 /* kubernetes */ tcp dpt:443 redir ports 47700 1 60 REDIRECT tcp -- * * 0.0.0.0/0 10.254.28.74 /* kubernetes-ro */ tcp dpt:80 redir ports 60099 0 0 REDIRECT tcp -- * * 0.0.0.0/0 10.254.216.51 /* webserver */ tcp dpt:8080 redir ports 40689 </pre> </p></div> </div> <p> 访问测试,http://192.168.1.201:40689/info.php,刷新浏览器发现proxy后端的变化,默认为随机轮循算法。<br /> <img alt="" src="//cto.wang/usr/uploads/2016/07/20160703180100-5.jpg" /><br /> <img alt="" src="//cto.wang/usr/uploads/2016/07/20160703180100-29.jpg" /></p> <p><strong>三、测试过程</strong><br /> </p> <pre class="prettyprint lang-bsh">1、pods自动复制、销毁测试,观察kubernetes自动保持副本数(6份) 删除replicationcontrollers中一个副本fedoraapache [root@SN2014-12-200 pods]# kubectl delete pods fedoraapache I1219 23:59:39.305730 9516 restclient.go:133] Waiting for completion of operation 142530 fedoraapache </pre> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> </p> <pre class="prettyprint lang-bsh">[root@SN2014-12-200 pods]# kubectl get pods NAME IMAGE(S) HOST LABELS STATUS 5d70892e-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.201/ name=fedoraapache Running 5d715e56-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.202/ name=fedoraapache Running 5d717f8d-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.202/ name=fedoraapache Running 5d71c584-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.201/ name=fedoraapache Running 5d71a494-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.202/ name=fedoraapache Running </pre> </p></div> </div> <h1>自动生成出一个副本,保持6份的效果<br /></h1> <div style="margin:10px;font-size:12px;background-color:#F5F5F9" class="quote"> <div style="font-weight:bold;background-color:#FBFEFF" class="quote-title"> 引用 </div> <div style="color:#444444" class="quote-content"> </p> <pre class="prettyprint lang-bsh">[root@SN2014-12-200 pods]# kubectl get pods NAME IMAGE(S) HOST LABELS STATUS 5d717f8d-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.202/ name=fedoraapache Running 5d71c584-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.201/ name=fedoraapache Running 5d71a494-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.202/ name=fedoraapache Running 2a8fb993-8798-11e4-970d-000c292f1620 fedora/apache 192.168.1.201/ name=fedoraapache Running 5d70892e-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.201/ name=fedoraapache Running 5d715e56-8794-11e4-970d-000c292f1620 fedora/apache 192.168.1.202/ name=fedoraapache Running 2、测试不同角色模块中的hostPort 1)pod中hostPort为空,而replicationcontrollers为指定端口,则异常;两侧都指定端口,相同或不同时都异常;pod的hostport为指定,另replicationcon为空,则正常;pod的hostport为空,另replicationcon为空,则正常;结论是在replicationcontrollers场景不能指定hostport,否则异常,待持续测试。 2)结论:在replicationcontronllers.json中,"replicaSelector": {"name": "webserver_pod"}要与"labels": {"name": "webserver_pod"}以及service中的"selector": {"name": "webserver_pod"}保持一致; 请关注下篇《kubernetes与HECD架构的整合》,近期推出。 参考文献: https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/getting-started-guides/fedora/fedora_manual_config.md https://github.com/GoogleCloudPlatform/kubernetes/blob/master/DESIGN.md http://www.infoq.com/cn/articles/Kubernetes-system-architecture-introduction 转载请注明来源 http://blog.liuts.com/post/247/</pre> </p></div> </div> <p> </p> <div style="text-align:left;color:#000000;background-color:#FFFFFF" class="textbox-bottom"> </div> <p><br class="Apple-interchange-newline" /></p> 最后修改:2021 年 12 月 10 日 10 : 53 AM © 允许规范转载 赞赏 如果觉得我的文章对你有用,请随意赞赏 赞赏作者 支付宝微信