centos7 yum安装kubernetes 1.1

xuke123

　　前提：centos7 已经update
　　yum update -y
　　

　　一、创建yum源 master，slave都要
　　kubernetes release 版本 yum源
　　http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/Packages/
　　

　　vi  virt7-docker-common-release.repo
[virt7-docker-common-release]
name=virt7-docker-common-release
baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/
gpgcheck=0　　

　　二、yum 安装服务
　　yum -y install --enablerepo=virt7-docker-common-release kubernetes etcd
　　

　　三、将主机名添加到master,slave的/etc/hosts里，如果主机名有dns解析就不需要添加
echo "192.168.5.221 k8s_master
192.168.5.222 k8s_slave1
192.168.5.237 k8s_slave2" >> /etc/hosts　　

　　四、修改/etc/kubernetes/config(所有节点)
# 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"
# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://192.168.5.221:8080"　　

　　五、禁用防火墙
systemctl disable iptables-services firewalld
systemctl stop iptables-services firewalld　　

　　六、在master节点配置kubernetes服务
　　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"　　

　　修改配置文件/etc/kubernetes/apiserver,修改如下：
###
# kubernetes system config
#
# The following values are used to configure the kube-apiserver
#
# 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"
# Port minions listen on
KUBELET_PORT="--kubelet-port=10250"
# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"
# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
# default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
# Add your own!
KUBE_API_ARGS=""　　

　　修改配置文件/etc/kubernetes/controller-manager，定义minions ip地址
KUBELET_ADDRESSES="--machines=192.168.5.222,192.168.5.223"　　

　　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　　

　　注意：1.1开始会自动加入证书认证，程序会自动生成证书文件，需要检查目录的属主属组
[root@k8s_master kubernetes]# pwd
/var/run/kubernetes
[root@k8s_master kubernetes]# ll
-rw-r--r-- 1 kube kube 1200 Nov 20 15:16 apiserver.crt
-rw------- 1 kube kube 1679 Nov 20 15:16 apiserver.key　　

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

　　

　　minions 节点配置
　　#单独安装docker 1.7
yum install docker-1.7.1* docker-selinux-1.7.1
systemctl enable docker-storage-setup.service
systemctl enable docker.service　　

　　#yum 安装kubernetes flannel
yum -y install --enablerepo=virt7-docker-common-release kubernetes flannel　　

　　#创建docker-pool
docker-storage-setup　　

　　#为etcd服务配置flannel，修改配置文件 /etc/sysconfig/flanneld
FLANNEL_ETCD="http://192.168.5.221:2379"　　

　　#修改kubernetes配置文件，指定master。/etc/kubernetes/config
# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://192.168.5.221:8080"　　

　　#配置kubelet服务。/etc/kubernetes/kubelet
# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
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=192.168.5.237"
# location of the api-server
KUBELET_API_SERVER="--api-servers=http://192.168.5.221:8080"　　

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

　　如果报错Bridge ip (...) does not match existing bridge configuration，是因为docker的bridge 先于flannel启动导致冲突
　　删除docker 0
ip link set dev docker0 down
brctl delbr docker0　　

　　vi /usr/lib/systemd/system/docker.service 修改如下：
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=flanneld.service
Wants=docker-storage-setup.service
Requires=flanneld.service
systemctl restart docker　　

　　#验证
　　#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。但是同机器的2块网卡ip相同
ip a | grep -E "flannel|docker"|grep inet
    inet 172.17.58.0/16 scope global flannel0
    inet 172.17.58.1/24 scope global docker0　　

　　#现在登陆master，确认minions的状态
[root@k8s_master etcd]#  kubectl get nodes
NAME            LABELS                                 STATUS    AGE
192.168.5.222   kubernetes.io/hostname=192.168.5.222   Ready     1d
192.168.5.237   kubernetes.io/hostname=192.168.5.237   Ready     2d