当下容器技术很火，为了保持时代同步，再cento7.0 上安装了k8s:
1: 找了两台server:
192.168.122.168 k8s-master
192.168.122.234 k8s-node
上面hostname 来设置:
hostnamectl set-hostname k8s-master
hostnamectl set-hostname k8s-node
2: 关闭防火墙：
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
#查看防火墙状态
firewall-cmd --state
3: 安装epel-release源
yum -y install epel-release
4: 在主机上安装: 192.168.122.168 ：kubernetes Master
使用yum安装etcd、kubernetes-master：
yum -y install etcd kubernetes-master
编辑：vi /etc/etcd/etcd.conf文件，修改结果如下：
#[Member]
#ETCD_CORS=""
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
#ETCD_WAL_DIR=""
#ETCD_LISTEN_PEER_URLS="http://localhost:2380"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
ETCD_NAME="default"
#ETCD_SNAPSHOT_COUNT="100000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
#ETCD_QUOTA_BACKEND_BYTES="0"
#ETCD_MAX_REQUEST_BYTES="1572864"
#ETCD_GRPC_KEEPALIVE_MIN_TIME="5s"
#ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s"
#ETCD_GRPC_KEEPALIVE_TIMEOUT="20s"
#
#[Clustering]
#ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379"
配置：vi /etc/kubernetes/apiserver文件，配置结果如下：
###
# 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="--insecure-bind-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,SecurityContextDeny,ResourceQuota"
# Add your own!
KUBE_API_ARGS=""
注意： 上面最后一段把“serviceaccount ” 参数删掉了。
5：启动etcd、kube-apiserver、kube-controller-manager、kube-scheduler等服务，并设置开机启动。
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES ; done
6： 在etcd中定义flannel网络
etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16"}'
》》》》》》》》以上master主机上的配置安装什么的都弄完了》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》
接下来弄node从机上的配置安装什么的
7 在node机上192.168.26.228安装kubernetes Node和flannel组件应用
yum -y install flannel kubernetes-node
8： 为flannel网络指定etcd服务，修改/etc/sysconfig/flanneld文件，配置结果如下图：
# Flanneld configuration options
# etcd url location. Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://192.168.122.168:2379"
# etcd config key. This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/atomic.io/network"
# Any additional options that you want to pass
#FLANNEL_OPTIONS=""
9； 修改：vi /etc/kubernetes/config文件，配置结果如下图：
###
# kubernetes system config
#
# The following values are used to configure various aspects of all
# kubernetes services, including
#
# kube-apiserver.service
# kube-controller-manager.service
# kube-scheduler.service
# kubelet.service
# kube-proxy.service
# 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://192.168.122.168:8080"
10:修改node机的kubelet配置文件/etc/kubernetes/kubelet
###
# 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=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=192.168.122.168"
# location of the api-server
KUBELET_API_SERVER="--api-servers=http://192.168.122.168:8080"
# pod infrastructure container
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
# Add your own!
KUBELET_ARGS=""
11: node节点机上启动kube-proxy,kubelet,docker,flanneld等服务，并设置开机启动。
for SERVICES in kube-proxy kubelet docker flanneld;do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES; done
》》》》》》以上所有master主机，node节点机上的配置就完成了，接下来看看k8s集群是否搭建起来了》》》》》》》》》》》》》》》》》》》
12: 在master主机上192.168.122.168执行如下命令，查看运行的node节点机器：
kubectl get nodes
[root@k8s-master ~]# kubectl get nodes
NAME STATUS AGE
192.168.122.168 Ready 2h
成功啦！ 另外可以用; kubectl describe nodes 来看node 的运行情况：
root@k8s-master ~]# kubectl describe node
Name: 192.168.122.168
Role:
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/hostname=192.168.122.168
Taints: <none>
CreationTimestamp: Sat, 19 Oct 2019 07:24:05 -0400
Phase:
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
OutOfDisk False Sat, 19 Oct 2019 09:46:13 -0400 Sat, 19 Oct 2019 09:24:10 -0400 KubeletHasSufficientDisk kubelet has sufficient disk space available
MemoryPressure False Sat, 19 Oct 2019 09:46:13 -0400 Sat, 19 Oct 2019 07:24:05 -0400 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sat, 19 Oct 2019 09:46:13 -0400 Sat, 19 Oct 2019 07:24:05 -0400 KubeletHasNoDiskPressure kubelet has no disk pressure
Ready True Sat, 19 Oct 2019 09:46:13 -0400 Sat, 19 Oct 2019 09:24:20 -0400 KubeletReady kubelet is posting ready status
Addresses: 192.168.122.168,192.168.122.168,192.168.122.168 （注意，这个有三个node ,表示有三个node, 如果一个node shutdown, 那么就会变成两个ip address）
Capacity:
alpha.kubernetes.io/nvidia-gpu: 0
cpu: 2
memory: 1014848Ki
pods: 110
Allocatable:
alpha.kubernetes.io/nvidia-gpu: 0
cpu: 2
memory: 1014848Ki
pods: 110
System Info:
Machine ID: ecb8036a93214aef8f127f89ceb8fb99
System UUID: ECB8036A-9321-4AEF-8F12-7F89CEB8FB99
Boot ID: b529266e-89cf-4d5f-9f35-54d727f522a6
Kernel Version: 3.10.0-957.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://1.13.1
Kubelet Version: v1.5.2
Kube-Proxy Version: v1.5.2
ExternalID: 192.168.122.168
Non-terminated Pods: (0 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits
--------- ---- ------------ ---------- --------------- -------------
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.
CPU Requests CPU Limits Memory Requests Memory Limits
------------ ---------- --------------- -------------
0 (0%) 0 (0%) 0 (0%) 0 (0%)
Events:
FirstSeen LastSeen Count From SubObjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
22m 22m 1 {kubelet 192.168.122.168} Normal Starting Starting kubelet.
22m 22m 1 {kubelet 192.168.122.168} Warning ImageGCFailed unable to find data for container /
22m 22m 2 {kubelet 192.168.122.168} Normal NodeHasSufficientDisk Node 192.168.122.168 status is now: NodeHasSufficientDisk
22m 22m 1 {kubelet 192.168.122.168} Normal NodeHasSufficientMemory Node 192.168.122.168 status is now: NodeHasSufficientMemory
22m 22m 1 {kubelet 192.168.122.168} Normal NodeHasNoDiskPressure Node 192.168.122.168 status is now: NodeHasNoDiskPressure
22m 22m 1 {kubelet 192.168.122.168} Warning Rebooted Node 192.168.122.168 has been rebooted, boot id: b529266e-89cf-4d5f-9f35-54d727f522a6
22m 22m 1 {kubelet 192.168.122.168} Normal NodeNotReady Node 192.168.122.168 status is now: NodeNotReady
21m 21m 1 {kubelet 192.168.122.168} Normal NodeReady Node 192.168.122.168 status is now: NodeReady
[root@k8s-master ~]#
具体测试方法可以reboot node server 来看master 上kubectl get node 就变成notready 了。