centos 7 安装kubernetes cluste
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：
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$ 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
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/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
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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
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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
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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
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yum -y install flannel kubernetes
2. 为etcd服务配置flannel，修改配置文件 /etc/sysconfig/flanneld
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FLANNEL_ETCD="http://192.168.5.131:2379"
3.修改kubernetes配置文件，指定master。/etc/kubernetes/config
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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 $SERVICES
done
6.在每个minions可以看到2块网卡：docker0和flannel0，这2块网卡的ip在不同的机器ip地址不同
minion1:
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ip a | grep flannel | grep inet
inet 172.17.20.0/16 scope global flannel0
minion2:
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$ 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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# 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
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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：
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# default admission control policies#
KUBE_ADMISSION_CONTROL="--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
需要去掉
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SecurityContextDeny,ServiceAccount
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