centos 7 安装kubernetes cluste

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在这里，我会展示如何安装一个kubernetes cluster,包含1个master 2个minions。

环境需求：
centos7 64位系统 三台机器

master：192.168.5.131
minions:192.168.5.132
minions:192.168.5.133

kubernetes 的组件：
etcd
flannel
kube-apiserver
kube-controller-manager
kube-scheduler
kubelet
kube-proxy

一、部署到centos7
图以后再配


先决条件

• 每台机器禁用iptables 避免和docker 的iptables冲突：
  
  

1 2	$ systemctl stop firewalld $ systemctl disable firewalld

2. 安装NTP并确保正常运行

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$ yum -y install ntp $ systemctl start ntpd $ systemctl enable ntpd

3. 2个minions机器安装docker

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yum install docker -y yum update -y reboot

CentOS系统，使用devicemapper作为存储后端，初始安装docker 会使用loopback, 导致docker启动报错。需要update之后再启动
ps aux|grep docker 结果如下

1	/usr/bin/docker -d --selinux-enabled --storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/VolGroup00-docker--pool

二、安装kubernetes master
以下步骤均在master上执行

• 通过yum安装etcd和kubernetes
  
  

1	yum -y install etcd kubernetes

2.修改配置文件/etc/etcd/etcd.conf,确保etcd监听所有地址，修改如下：

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ETCD_NAME=default ETCD_DATA_DIR="/var/lib/etcd/default.etcd" ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"

3.修改配置文件/etc/kubernetes/apiserver,修改如下：

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KUBE_API_ADDRESS="--address=0.0.0.0" KUBE_API_PORT="--port=8080" KUBELET_PORT="--kubelet_port=10250" KUBE_ETCD_SERVERS="--etcd_servers=http://127.0.0.1:2379" KUBE_SERVICE_ADDRESSES="--portal_net=10.254.0.0/16" KUBE_ADMISSION_CONTROL="--admission_control=NamespaceAutoProvision,LimitRanger,ResourceQuota" KUBE_API_ARGS=""

4.修改配置文件/etc/kubernetes/controller-manager，定义minions ip地址

1	KUBELET_ADDRESSES="--machines=192.168.5.132,192.168.5.133"

5.启动服务

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for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do     systemctl restart $SERVICES     systemctl enable $SERVICES     systemctl status $SERVICES done

6.定义flannel网络配置到etcd,这个配置会推送到各个minions的flannel服务上

1	etcdctl mk /coreos.com/network/config '{"Network":"172.17.0.0/16"}'

三、安装minions

以下操作均在minions1,minions2上执行

• 安装flannel和kubernetes
  
  

1	yum -y install flannel kubernetes

2. 为etcd服务配置flannel，修改配置文件 /etc/sysconfig/flanneld

1	FLANNEL_ETCD="http://192.168.5.131:2379"

3.修改kubernetes配置文件，指定master。/etc/kubernetes/config

1	KUBE_MASTER="--master=http://192.168.5.131:8080"

4.配置kubelet服务。/etc/kubernetes/kubelet
minions1:

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### # 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=192.168.5.132" # 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=192.168.5.132" # location of the api-server KUBELET_API_SERVER="--api_servers=http://192.168.5.131:8080" # Add your own! KUBELET_ARGS=""

minions2:

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### # 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=192.168.5.133" # 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=192.168.5.133" # location of the api-server KUBELET_API_SERVER="--api_servers=http://192.168.5.131:8080" # Add your own! KUBELET_ARGS=""

5.启动服务

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for SERVICES in kube-proxy kubelet docker flanneld; do     systemctl restart $SERVICES     systemctl enable $SERVICES     systemctl status $SERVICES done

6.在每个minions可以看到2块网卡：docker0和flannel0，这2块网卡的ip在不同的机器ip地址不同
minion1:

1 2	ip a | grep flannel | grep inet inet 172.17.20.0/16 scope global flannel0

minion2:

1 2	$ ip a | grep flannel | grep inet inet 172.17.21.0/16 scope global flannel0

7.现在登陆master，确认minions的状态

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[iyunv@k8s_master ~]# kubectl get nodes NAME            LABELS                                 STATUS 192.168.5.132   kubernetes.io/hostname=192.168.5.132   Ready 192.168.5.133   kubernetes.io/hostname=192.168.5.133   Ready

太棒了！kubernetes的集群就配置完成了，下面让我们开始弄pod


在创建pod如果有报错为

1	is forbidden: no API token found for service account default/default, retry after the token is automatically created and added to the service account

如果你在apiserver配置如下：

1 2	# default admission control policies# KUBE_ADMISSION_CONTROL="--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"

需要去掉

1	SecurityContextDeny,ServiceAccount