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:
$ systemctl stop firewalld
$ systemctl disable firewalld
|
2. 安装NTP并确保正常运行
$ yum -y install ntp
$ systemctl start ntpd
$ systemctl enable ntpd
|
3. 2个minions机器安装docker
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
|
/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
|
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:
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:
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
|
KUBELET_ADDRESSES= "--machines=192.168.5.132,192.168.5.133"
|
5.启动服务
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
|
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
|
yum -y install flannel kubernetes
|
2. 为etcd服务配置flannel,修改配置文件 /etc/sysconfig/flanneld
|
FLANNEL_ETCD= "http://192.168.5.131:2379"
|
3.修改kubernetes配置文件,指定master。/etc/kubernetes/config
|
KUBE_MASTER= "--master=http://192.168.5.131:8080"
|
4.配置kubelet服务。/etc/kubernetes/kubelet
minions1:
KUBELET_ADDRESS= "--address=192.168.5.132"
KUBELET_PORT= "--port=10250"
KUBELET_HOSTNAME= "--hostname_override=192.168.5.132"
KUBELET_API_SERVER= "--api_servers=http://192.168.5.131:8080"
KUBELET_ARGS= ""
|
minions2:
KUBELET_ADDRESS= "--address=192.168.5.133"
KUBELET_PORT= "--port=10250"
KUBELET_HOSTNAME= "--hostname_override=192.168.5.133"
KUBELET_API_SERVER= "--api_servers=http://192.168.5.131:8080"
KUBELET_ARGS= ""
|
5.启动服务
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:
ip a | grep flannel | grep inet
inet 172.17.20.0 /16 scope global flannel0
|
minion2:
$ 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
[root@k8s_master ~]
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
|
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:
KUBE_ADMISSION_CONTROL= "--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
|
需要去掉
|
SecurityContextDeny,ServiceAccount
|
(责任编辑:IT) |