centos7 kubernetes安装手册
安装之前，将三台centos7服务器禁止防火墙，同时需要启动的镜像2台node机器都要保持时间一致，否则pod不能启动1 有三台centos7服务器：10.1.1.170（master），10.1.1.169 node1,10.1.1.171 node2
2 在三台机器上安装ntp服务，以保证所有时间可以同步
#yum -y install ntp
#systemctl start ntpd
#systemctl enable ntpd
3 在10.1.1.170上安装kubernetes master
Yum install etcd
Yum install kubernetes
Cd /etc/etcd
Vi etcd.conf，需要注意项：
ETCD_NAME=default
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
* cd /etc/kubernetes/
* vi apiserver
# more apiserver
###
# 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=127.0.0.1"
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,SecurityContextDeny,ServiceAccount,ResourceQuota"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
# Add your own!
KUBE_API_ARGS=""
* cd /etc/kubernetes
* vi controller-manager 定义节点
# more controller-manager
###
# The following values are used to configure the kubernetes controller-manager
# defaults from config and apiserver should be adequate
# Add your own!
KUBE_CONTROLLER_MANAGER_ARGS=""
KUBELET_ADDRESSES="--machine=10.1.1.169,10.1.1.171"
*依次启动服务，将服务放入启动目录（etcd\kube-apiserver\kube-controller-manager\kube-scheduler）：
systemctl restart 服务名
systemctl enable 服务名
systemctl status 服务名
* 定义flannel网络配置到etcd，配置被推送到各个minions的flannel网络上
etcdctl mk /coreos.com/network/config '{"Network":"172.17.0.0/16"}'
4 在节点（10.1.1.169,10.1.1.171）上进行minions部署
#yum install flannel
#yum install kubernetes
*修改flannel配置文件，以使用etcd服务
#vi /etc/sysconfig/flanneld
# more /etc/sysconfig/flanneld
# Flanneld configuration options
# etcd url location.Point this to the server where etcd runs
FLANNEL_ETCD="http://10.1.1.170:2379"
# etcd config key.This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_KEY="/atomic.io/network"
# Any additional options that you want to pass
#FLANNEL_OPTIONS=""
*配置kubernetes配置文件
#vi /etc/ kubernetes/config
# more /etc/kubernetes/config
###
# 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://10.1.1.170:8080"
*配置kubelet服务
#vi /etc/kubernetes/kubelet
# more /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=10.1.1.171"
# 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=10.1.1.171"
# location of the api-server
KUBELET_API_SERVER="--api-servers=http://10.1.1.170:8080"
# pod infrastructure container
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
# Add your own!
KUBELET_ARGS=""
*启动服务（kube-proxy\kubylet\docker\flanneld），很奇怪启动flanneld服务时报错，但是过一段时间k8s一切OK
#systemctl restart 服务
#system enable 服务
#systemctl status 服务
5 将三台机器进行ssh免密码操作：
#ssh-keygen
#ssh-copy-id root@10.1.1.171
#ssh-copy-id root@10.1.1.169
6 测试kubernetes服务是否正常
# kubectl get nodes
NAME LABELS STATUS AGE
10.1.1.169 kubernetes.io/hostname=10.1.1.169 Ready 20h
10.1.1.171 kubernetes.io/hostname=10.1.1.171 Ready 21h
# kubectl get componentstatuses
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok nil
scheduler Healthy ok nil
etcd-0 Healthy {"health": "true"} nil
kubectl run tomcat --image=tomcat:8.0 --port=8080 --replicas=5
# kubectl get rc,pods
CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS AGE
centos7 centos7 centos:7 run=centos7 3 59m
mysql mysql mysql:5.5 run=mysql 7 1h
tomcat tomcat tomcat:8.0 run=tomcat 5 19h
NAME READY STATUS RESTARTS AGE
centos7-asa0g 1/1 Running 15 59m
centos7-eow3g 0/1 CrashLoopBackOff 16 59m
centos7-qmslb 0/1 CrashLoopBackOff 12 59m
mysql-0a5tv 0/1 CrashLoopBackOff 16 1h
mysql-131lh 0/1 CrashLoopBackOff 16 1h
mysql-7cj2s 0/1 CrashLoopBackOff 16 1h
mysql-89h04 0/1 CrashLoopBackOff 16 1h
mysql-htu4u 0/1 CrashLoopBackOff 16 1h
mysql-khndm 0/1 CrashLoopBackOff 16 1h
mysql-uke1c 0/1 CrashLoopBackOff 16 1h
tomcat-1wwbn 1/1 Running 1 19h
tomcat-f83z1 1/1 Running 1 19h
tomcat-fu2qf 1/1 Running 1 19h
tomcat-l39ih 1/1 Running 1 19h
tomcat-o647v 1/1 Running 1 19h
在两台节点上可以发现，一个节点上跑了2个tomcat，一个节点上跑了3个tomcat，一旦一个镜像被删除，则马上会在启动一个新的节点
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