Kubernetes 安装

下图是一个基本的Kubernetes 安装部署图。

图片.png

由于资源限制，我只选了两个虚拟机来尝试。
Master: 192.168.59.131
Minion: 192.168.59.130

准备工作：

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.

[root@localhost ~]# yum -y install ntp
Loaded plugins: fastestmirror, langpacks
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
Loading mirror speeds from cached hostfile

base: mirrors.163.com
extras: mirrors.163.com
updates: mirrors.nwsuaf.edu.cn
Package ntp-4.2.6p5-25.el7.centos.2.x86_64 already installed and latest version
Nothing to do
[root@localhost ~]# systemctl start ntpd
[root@localhost ~]# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.

yum update -y

安装Master：
etcd Kubernetes

yum -y install etcd kubernetes flannel

配置etcd
[root@localhost ~]# egrep -v "^#|$" /etc/etcd/etcd.conf
ETCD_NAME=default
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://0.0.0.0:2379"
配置k8s api
[root@localhost ~]# egrep -v "^#|$" /etc/kubernetes/apiserver
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
KUBE_API_ARGS=""
配置flannel网络
[root@localhost ~]# egrep -v "^#|$" /etc/sysconfig/flanneld
FLANNEL_ETCD_ENDPOINTS="http://localhost:2379"
FLANNEL_ETCD_PREFIX="/coreos.com/network"

启动etcd k8s服务

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

定义flannel network

[root@localhost ~]# etcdctl mk /coreos.com/network/config '{"Network":"172.17.0.0/16"}'

安装配置Kubernetes Minions (Nodes节点都执行一遍)

yum -y install flannel kubernetes

配置/etc/sysconfig/flanneld
[root@localhost pods]# egrep -v "^#|$" /etc/sysconfig/flanneld
FLANNEL_ETCD_ENDPOINTS="http://192.168.59.131:2379"
FLANNEL_ETCD_PREFIX="/coreos.com/network"

配置k8s /etc/kubernetes/config
[root@localhost pods]# egrep -v "^#|$" /etc/kubernetes/config
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://192.168.59.131:8080"

配置kubelet服务 /etc/kubernetes/kubelet
[root@localhost pods]# egrep -v "^#|$" /etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_HOSTNAME="--hostname-override=192.168.59.130"
KUBELET_API_SERVER="--api-servers=http://192.168.59.131:8080"
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
KUBELET_ARGS=""

启动服务

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

完成后检查
查看每个k8s node上的iflannel ip
[root@localhost pods]# ip a |grep flannel|grep inet
inet 172.17.9.0/16 scope global flannel0

[root@localhost pods]# ip a |grep flannel|grep inet
inet 172.17.58.0/16 scope global flannel0

查询相关节点
[root@localhost pods]# kubectl get nodes
NAME STATUS AGE
192.168.59.130 Ready 21h
[root@localhost pods]# kubectl get nodes -s http://192.168.59.131:8080
NAME STATUS AGE
192.168.59.130 Ready 22h

创建pod测试
创建配置文件：

[root@localhost pods]# cat nginx.yaml
apiVersion: v1
kind: Service
metadata:
  name: my-nginx-svc
  labels:
    app: nginx
spec:
  type: LoadBalancer
  ports:
  - port: 80
  selector:
    app: nginx
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: my-nginx
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80

kubectl create -f nginx.yaml -s http://192.168.59.131:8080
[root@localhost pods]# kubectl get pods -l app=nginx -s http://192.168.59.131:8080
NAME READY STATUS RESTARTS AGE
my-nginx-4087004473-mv2bl 1/1 Running 0 21h
my-nginx-4087004473-n5sz9 1/1 Running 0 21h
my-nginx-4087004473-zxj7g 1/1 Running 0 21h

[root@localhost pods]# kubectl get services -s http://192.168.59.131:8080
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.254.0.1 443/TCP 6d
my-nginx-svc 10.254.222.14 80:32660/TCP 21h
[root@localhost pods]# kubectl describe services -s http://192.168.59.131:8080
Name: kubernetes
Namespace: default
Labels: component=apiserver
provider=kubernetes
Selector:
Type: ClusterIP
IP: 10.254.0.1
Port: https 443/TCP
Endpoints: 192.168.59.131:6443
Session Affinity: ClientIP
No events.

Name: my-nginx-svc
Namespace: default
Labels: app=nginx
Selector: app=nginx
Type: LoadBalancer
IP: 10.254.222.14
Port: 80/TCP
NodePort: 32660/TCP
Endpoints: 172.17.58.11:80,172.17.58.8:80,172.17.58.9:80
Session Affinity: None
No events.

问题与解决
route add default gw 192.168.42.1
不错的Blog：
http://blog.csdn.net/linshenyuan1213/article/details/53304276
http://www.cnblogs.com/ivictor/p/4998032.html
http://blog.chinaunix.net/uid-25057421-id-5759696.html
http://www.cnblogs.com/fengjian2016/p/6392900.html

Kubernetes 安装

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