Docker实践—CentOS7上部署Kubernetes详解

  • Z时代
  • 2024-01-10
  • 分类：综合

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

# cat /etc/kubernetes/kubelet
###
# kubernetes kublet (minion) config
# The address for the info server to serve on
MINION_ADDRESS="10.193.6.36"
# The port for the info server to serve on
MINION_PORT="10250"
# You may leave this blank to use the actual hostname
MINION_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 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"

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

[Unit]
Description=Kubernetes Kubelet
#After=docker.socket cadvisor.service
After=cadvisor.service
#Requires=docker.socket cadvisor.service
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，

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