Kubernetes（k8s）中文文档 CentOS部署Kubernetes集群_Kubernetes中文社区
译者：张以法
前提条件
你需要2台或以上安装有CentOS的机器
启动一个集群
本文是针对CentOS系统的Kubernetes入门教程。通过手动配置，你将会理解所有底层的包、服务、端口等。
本文只会让一个节点工作。多节点需要在Kubernetes之外配置一个可用的的网络环境，尽管这个额外的配置条件是显而易见的，（本节也不会去配置）。
Kubernetes包提供了一些服务：kube-apiserver, kube-scheduler, kube-controller-manager,kubelet, kube-proxy。这些服务通过systemd进行管理，配置信息都集中存放在一个地方：/etc/kubernetes。我们将会把这些服务运行到不同的主机上。第一台主机，centosmaster，将是Kubernetes 集群的master主机。这台机器上将运行kube-apiserver, kubecontroller-manager和kube-scheduler这几个服务，此外，master主机上还将运行etcd。其余的主机，fed-minion，将是从节点，将会运行kubelet, proxy和docker。
系统信息：
主机：
centos-master = 192.168.121.9
centos-minion = 192.168.121.65
准备主机：
添加virt7-testing源，在所有主机上（centos-master和centos-minion），使用下面信息添加源：
[virt7-testing]
name=virt7-testing
baseurl=http://cbs.centos.org/repos/virt7-testing/x86_64/os/
gpgcheck=0
- 在所有主机上（centos-master和centos-minion）都安装Kubernetes。这对etcd，docker和cadvisor也适用。
yum -y install --enablerepo=virt7-testing kubernetes
*注意使用etcd-0.4.6-7(这是该文档的临时版本)
如果你没有配套virt7-testing源安装etcd 0.4.6-7版，请用下面命令卸载它：
yum erase etcd
原因是在当前的的 virt7-testing源中，etcd包被更新了，会引起服务错误。 执行下面两行命令安装etcd-0.4.6-7
yum install http://cbs.centos.org/kojifiles/packages/etcd/0.4.6/7.el7.centos/x86_64/etcd-0.4.6-7.el7.centos.x86_64.rpm
yum -y install --enablerepo=virt7-testing kubernetes- 在所有主机的/etc/hosts文件中加入master和node节点，如果DNS中已经有了主机名，就不需要加了。
echo "192.168.121.9 centos-master
192.168.121.65 centos-minion" >> /etc/hosts
- 编辑/etc/kubernetes/config文件，加入以下内容：
# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS=”–etcd_servers=http://centos-master: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 privileged docker containers
KUBE_ALLOW_PRIV=”–allow_privileged=false”
- 禁用master和node上的防火墙，因为如果有其他防火墙规则管理工具的话，docker会无法正常运行。
systemctl disable iptables-services firewalld
systemctl stop iptables-services firewalld
配置master主机上Kubernetes服务
- 按照下面的示例编辑/etc/kubernetes/apiserver文件：
# 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=http://centos-master:8080″# Port kubelets listen on
KUBELET_PORT=”–kubelet_port=10250″# Address range to use for services
KUBE_SERVICE_ADDRESSES=”–service-cluster-ip-range=10.254.0.0/16″# Add your own!
KUBE_API_ARGS=””
- 启动master上恰当的服务
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES done
配置node节点上的Kubernetes服务 我们需要在节点上配置kubelet并启动kubelet和proxy
- 按照下面的示例编辑/etc/kubernetes/kubelet文件：Kubernetes中文文档
# The address for the info server to serve on
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=centos-minion”# Add your own!
KUBELET_ARGS=””
- 启动节点上（fed-node）上恰当的服务
for SERVICES in kube-proxy kubelet docker; do systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES done
你应该完成了！
- 检查以确认现在集群中fed-master能够看到fed-node
$ kubectl get nodes
NAME LABELS STATUS
centos-minion <none> Ready
集群现在应该在运行了，启动一个用于测试的pod吧。
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Created at: 2019-04-18 23:55:56
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