Docker实践(6)—CentOS7上部署Kubernetes
Kubernetes架构
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
# 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
# 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 apiserver KUBE_MASTER="10.193.6.35:8080" # Comma seperated list of minions MINION_ADDRESSES="10.193.6.36" # Port minions listen on MINION_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 cluster KUBE_ETCD_SERVERS="http://10.193.6.35:4001" # logging to stderr means we get it in the systemd journal KUBE_LOGTOSTDERR="true" # journal message level, 0 is debug KUBE_LOG_LEVEL=0 # Should this cluster be allowed to run privleged docker containers KUBE_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。
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES systemctl enable $SERVICES systemctl status $SERVICES done
配置yy2
1 # cat /etc/kubernetes/kubelet 2 3 ### 4 5 # kubernetes kublet (minion) config 6 7 8 9 # The address for the info server to serve on 10 11 MINION_ADDRESS="10.193.6.36" 12 13 14 15 # The port for the info server to serve on 16 17 MINION_PORT="10250" 18 19 20 21 # You may leave this blank to use the actual hostname 22 23 MINION_HOSTNAME="10.193.6.36" 24 25 26 27 # cat /etc/kubernetes/config 28 29 ### 30 31 # kubernetes system config 32 33 # 34 35 # The following values are used to configure various aspects of all 36 37 # kubernetes services, including 38 39 # 40 41 # kubernetes-apiserver.service 42 43 # kubernetes-controller-manager.service 44 45 # kubernetes-kubelet.service 46 47 # kubernetes-proxy.service 48 49 50 51 # Comma seperated list of nodes in the etcd cluster 52 53 KUBE_ETCD_SERVERS="http://10.193.6.35:4001" 54 55 56 57 # logging to stderr means we get it in the systemd journal 58 59 KUBE_LOGTOSTDERR="true" 60 61 62 63 # journal message level, 0 is debug 64 65 KUBE_LOG_LEVEL=0 66 67 68 69 # Should this cluster be allowed to run privleged docker containers 70 71 KUBE_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
1 [Unit] 2 3 Description=Kubernetes Kubelet 4 5 #After=docker.socket cadvisor.service 6 7 After=cadvisor.service 8 9 #Requires=docker.socket cadvisor.service 10 11 Requires=cadvisor.service
启动yy2上的相关服务
minion上需要运行kube-proxy，kubelet以及docker。
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。
# 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。
[root@yy1 ~]# kubecfg -c apache.json create pods I0925 06:43:26.768122 09313 request.go:292] Waiting for completion of /operations/1 ID 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。
[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，
主要参考
https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/getting-started-guides/fedora/fedora_manual_config.md
作者：YY哥
出处：http://www.cnblogs.com/hustcat/
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