kubernetes高可用集群布署

 

 

#172826370@qq.com 20170509

 

 本文分为两篇

1.http方式仿问kube-apiserver的高可用模式，无证书模式1.5x yum安装k8s所有组件

2.https方式访问kube-apiserver的高可用模式，即证书模式基于kubernetes1.6x，二进至安装kubernetes所有组件，证书模式请看后面.

#1.系统centos7 所有节点是yum 安装的kubernetes 1.5版本，本方案也实用于二进至版本k8s1.5X,1.6X版本， 物理机集群等。

 

#前提是集群已经正确运行没有任何问题

 

#原理参照 kubadm 和kargo  三个master做高可用所有node上安装haproxy 负载均衡反代三台kube-apiserver的8080端口 api-server为无状态服务

 

#注意，之前用过nginx配置反代三台apiserver出现创建、删除pod 容器非常慢，3-5分钟，应该有BUG ,建议用haproxy反代,非常顺畅.

#注意所有的机器的SELINUX=disabled  # 关闭

#controller-manager 和scheduler 为有状态服务，同一时间只有一台当选，会在三台master机之间进行选举，由其中一台担任leader的角色

 

原理图架构一,  本文档基于架构一

 

 

 

 

架构二

 

 

 

#节点构造如下

cat /etc/hosts

 

 

#master

192.168.1.61 master1.txg.com   #512M

192.168.1.62 master2.txg.com   #512M

192.168.1.63 master2.txg.com   #512M

 

#master软件包

[root@master1 kubernetes]# rpm -qa|grep kube

kubernetes-client-1.5.2-0.2.gitc55cf2b.el7.x86_64

kubernetes-master-1.5.2-0.2.gitc55cf2b.el7.x86_64

flannel-0.7.0-1.el7.x86_64

 

 

#etcd-server

192.168.1.65 etcd1.txg.com   #512M

192.168.1.66 etcd2.txg.com   #512M

192.168.1.67 etcd3.txg.com   #512M

 

#node节点 

192.168.1.68 node1.txg.com   #4G

192.168.1.69 node2.txg.com   #4G

192.168.2.68 node3.txg.com   #4G

192.168.2.69 node4.txg.com   #4G

 

#node节点软件包

[root@node4 ~]# rpm -qa|egrep 'kube|docker'

kubernetes-client-1.5.2-0.5.gita552679.el7.x86_64

docker-common-1.12.6-11.el7.centos.x86_64

docker-1.12.6-11.el7.centos.x86_64

kubernetes-node-1.5.2-0.5.gita552679.el7.x86_64

docker-client-1.12.6-11.el7.centos.x86_64

flannel-0.7.0-1.el7.x86_64

 

[root@node4 ~]# uname -a

Linux node4.txg.com 3.10.0-514.6.2.el7.x86_64 #1 SMP Thu Feb 23 03:04:39 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

 

 

 

 

修改master server上的配置文件，我的配置文件在/etc/kubernetes/下面

[root@master1 kubernetes]# pwd

/etc/kubernetes

[root@master1 kubernetes]# ls

apiserver  config  controller-manager  scheduler  ssl  sslbk

 

 

1.修改controller-manager和scheduler配置文件在KUBE_CONTROLLER_MANAGER_ARGS="  " 中间加入 --address=127.0.0.1 --leader-elect=true

KUBE_CONTROLLER_MANAGER_ARGS="  --address=127.0.0.1 --leader-elect=true --service-account-private-key-file=/etc/kubernetes/ssl/apiserver-key.pem --cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem --cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem --root-ca-file=/etc/kubernetes/ssl/ca.pem"

修改scheduler 为 KUBE_SCHEDULER_ARGS=" --address=127.0.0.1 --leader-elect=true"

让节点有选举master leader 功能，ok master配置完成

 

同步master1上的配置文件到master2 3 节点

 

 

2.所有node节点安装 haproxy , yum install haproxy 

 

 

#配置haproxy.cfg文件 监听5002端口，所向代理kube-apiserver:8080

 

[root@node4 ~]# cat /etc/haproxy/haproxy.cfg 

#---------------------------------------------------------------------

# Example configuration for a possible web application.  See the

# full configuration options online.

#

#   http://haproxy.1wt.eu/download/1.4/doc/configuration.txt

#

#---------------------------------------------------------------------

 

#---------------------------------------------------------------------

# Global settings

#---------------------------------------------------------------------

global

    # to have these messages end up in /var/log/haproxy.log you will

    # need to:

    #

    # 1) configure syslog to accept network log events.  This is done

    #    by adding the '-r' option to the SYSLOGD_OPTIONS in

    #    /etc/sysconfig/syslog

    #

    # 2) configure local2 events to go to the /var/log/haproxy.log

    #   file. A line like the following can be added to

    #   /etc/sysconfig/syslog

    #

    #

    log         127.0.0.1 local3

 

    #      local2.*                 /var/log/haproxy.log

    chroot      /var/lib/haproxy

    pidfile     /var/run/haproxy.pid

    maxconn     4000

    user        haproxy

    group       haproxy

    daemon

 

    # turn on stats unix socket

    stats socket /var/lib/haproxy/stats

 

#---------------------------------------------------------------------

# common defaults that all the 'listen' and 'backend' sections will

# use if not designated in their block

#---------------------------------------------------------------------

defaults

    mode                    http

    log                     global

    option                  httplog

    option                  dontlognull

    option http-server-close

    option forwardfor       except 127.0.0.0/8

    option                  redispatch

    retries                 3

    timeout http-request    10s

    timeout queue           1m

    timeout connect         10s

    timeout client          1m

    timeout server          1m

    timeout http-keep-alive 10s

    timeout check           10s

    maxconn                 3000

 

#---------------------------------------------------------------------

# main frontend which proxys to the backends

#---------------------------------------------------------------------

frontend  main *:5002

stats uri /haproxy

 #   acl url_static       path_beg       -i /static /images /javascript /stylesheets

 #   acl url_static       path_end       -i .jpg .gif .png .css .js

 

  #  use_backend static          if url_static

    default_backend             app

 

#---------------------------------------------------------------------

# static backend for serving up images, stylesheets and such

#---------------------------------------------------------------------

#backend static

#    balance     roundrobin

#    server      static 127.0.0.1:4331 check

 

#---------------------------------------------------------------------

# round robin balancing between the various backends

#---------------------------------------------------------------------

backend app

    mode http

    balance     roundrobin

    server  app1 192.168.1.61:8080 check

    server  app2 192.168.1.62:8080 check

    server  app3 192.168.1.63:8080 check

 

 

#server 部份按照自己apiserver 三台  配置进来即可

 

 

3.配置rsyslog收集haproxy日志

[root@node4 ~]# echo -e '$ModLoad imudp \n $UDPServerRun 514 \n local3.* /var/log/haproxy.log' >> /etc/rsyslog.conf

 

 

4.配置node节点配置

 

#配置config 文件 KUBE_MASTER="--master=http://127.0.0.1:5002" 参数指向haproxy的5002端口

 

 

[root@node4 kubernetes]# pwd

/etc/kubernetes

[root@node4 kubernetes]# ls

config  kubelet  proxy

 

 

[root@node4 kubernetes]# cat 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=true"

 

# How the controller-manager, scheduler, and proxy find the apiserver

KUBE_MASTER="--master=http://127.0.0.1:5002"

 

 

 

 

 

#配置kubelet  KUBELET_API_SERVER="--api-servers=http://127.0.0.1:5002"

[root@node4 kubernetes]# cat 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=192.168.2.69"

 

# location of the api-server

KUBELET_API_SERVER="--api-servers=http://127.0.0.1:5002"

 

# pod infrastructure container

#KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"

 

# Add your own!

KUBELET_ARGS="--cluster_dns=172.1.0.2 --cluster_domain=cluster.local"

 

 

#所有node节点照此配置完成

 

 

5.#重启所有node节点上的服务,在这里我用ansible来处理，ansible请自行脑补，建议大家用ansible来批量处理会快很多

#没有安装ansible的，请自行手动重启

 

 

[root@master1 ~]# ansible -m shell -a ' systemctl restart rsyslog.service ;service haproxy restart ;systemctl restart kubelet.service;systemctl restart kube-proxy.service' 'nodes'

node3.txg.com | SUCCESS | rc=0 >>

Redirecting to /bin/systemctl restart  haproxy.service

 

node4.txg.com | SUCCESS | rc=0 >>

Redirecting to /bin/systemctl restart  haproxy.service

 

node2.txg.com | SUCCESS | rc=0 >>

Redirecting to /bin/systemctl restart  haproxy.service

 

node1.txg.com | SUCCESS | rc=0 >>

Redirecting to /bin/systemctl restart  haproxy.service

 

 

#查看所有node上 haproxy 日志 200为正常

[root@node3 kubernetes]# tail -f /var/log/haproxy.log 

2017-05-09T11:23:12+08:00 localhost haproxy[18278]: 127.0.0.1:42970 [09/May/2017:11:23:11.992] main app/app1 52/0/0/186/238 200 2507 - - ---- 6/6/5/2/0 0/0 "PUT /api/v1/nodes/192.168.2.69/status HTTP/1.1"

2017-05-09T11:23:22+08:00 localhost haproxy[18278]: 127.0.0.1:42970 [09/May/2017:11:23:12.229] main app/app2 10000/0/1/1/10002 200 2519 - - ---- 6/6/5/1/0 0/0 "GET /api/v1/nodes?fieldSelector=metadata.name%3D192.168.2.69&resourceVersion=0 HTTP/1.1"

2017-05-09T11:23:22+08:00 localhost haproxy[18278]: 127.0.0.1:42970 [09/May/2017:11:23:22.232] main app/app3 60/0/0/123/183 200 2507 - - ---- 6/6/5/2/0 0/0 "PUT /api/v1/nodes/192.168.2.69/status HTTP/1.1"

2017-05-09T11:23:28+08:00 localhost haproxy[18278]: 127.0.0.1:42722 [09/May/2017:11:22:21.385] main app/app1 7384/0/1/0/67387 200 167 - - sD-- 5/5/4/1/0 0/0 "GET /api/v1/watch/pods?fieldSelector=spec.nodeName%3D192.168.2.69&resourceVersion=2348326&timeoutSeconds=424 HTTP/1.1"

2017-05-09T11:23:32+08:00 localhost haproxy[18278]: 127.0.0.1:43096 [09/May/2017:11:23:32.416] main app/app2 0/0/0/1/1 200 2519 - - ---- 6/6/5/1/0 0/0 "GET /api/v1/nodes?fieldSelector=metadata.name%3D192.168.2.69&resourceVersion=0 HTTP/1.1"

2017-05-09T11:23:32+08:00 localhost haproxy[18278]: 127.0.0.1:43096 [09/May/2017:11:23:32.418] main app/app3 53/0/0/92/145 200 2507 - - ---- 6/6/5/2/0 0/0 "PUT /api/v1/nodes/192.168.2.69/status HTTP/1.1"

2017-05-09T11:23:35+08:00 localhost haproxy[18278]: 127.0.0.1:43096 [09/May/2017:11:23:32.564] main app/app1 2459/0/1/1/2461 200 2507 - - ---- 6/6/5/3/0 0/0 "GET /api/v1/namespaces/kube-system/secrets/default-token-p5l8p HTTP/1.1"

2017-05-09T11:23:42+08:00 localhost haproxy[18278]: 127.0.0.1:38410 [09/May/2017:11:14:38.515] main app/app3 0/0/1/1/544002 200 254800 - - ---- 6/6/4/1/0 0/0 "GET /api/v1/watch/endpoints?resourceVersion=2347840&timeoutSeconds=544 HTTP/1.1"

2017-05-09T11:23:42+08:00 localhost haproxy[18278]: 127.0.0.1:43096 [09/May/2017:11:23:35.024] main app/app3 7540/0/0/1/7541 200 2519 - - ---- 6/6/5/1/0 0/0 "GET /api/v1/nodes?fieldSelector=metadata.name%3D192.168.2.69&resourceVersion=0 HTTP/1.1"

2017-05-09T11:23:42+08:00 localhost haproxy[18278]: 127.0.0.1:43096 [09/May/2017:11:23:42.566] main app/app1 51/0/1/111/163 200 2507 - - ---- 6/6/5/2/0 0/0 "PUT /api/v1/nodes/192.168.2.69/status HTTP/1.1"

 

 

 

#重启所有master节点上的服务

 

ansible -m shell -a 'systemctl  restart kube-apiserver.service;systemctl restart kube-controller-manager.service ;systemctl restart kube-scheduler.service ' 'masters'

 

6.查看leader信息位于哪个节点

 

[root@master3 ~]# tail -f /var/log/messages

May  9 11:09:43 master1 kube-scheduler: I0509 11:09:43.354272    4636 leaderelection.go:247] lock is held by master3.txg.com and has not yet expired

May  9 11:09:43 master1 kube-controller-manager: I0509 11:09:43.887592    4532 leaderelection.go:247] lock is held by master2.txg.com and has not yet expired

 

#这时， kube-scheduler leader位于master3 和kube-controller-manager 在master2

 

 

[root@master3 ~]# kubectl -n kube-system get ep kube-controller-manager -o yaml

apiVersion: v1

kind: Endpoints

metadata:

  annotations:

    control-plane.alpha.kubernetes.io/leader: '{"holderIdentity":"master2.txg.com","leaseDurationSeconds":15,"acquireTime":"2017-05-08T10:41:07Z","renewTime":"2017-05-09T03:14:02Z","leaderTransitions":0}'

  creationTimestamp: 2017-05-08T10:41:07Z

  name: kube-controller-manager

  namespace: kube-system

  resourceVersion: "2347791"

  selfLink: /api/v1/namespaces/kube-system/endpoints/kube-controller-manager

  uid: d7dae24f-33da-11e7-9a51-525400c2bc59

subsets: []

[root@master1 ~]# kubectl -n kube-system get ep kube-scheduler -o yaml

apiVersion: v1

kind: Endpoints

metadata:

  annotations:

    control-plane.alpha.kubernetes.io/leader: '{"holderIdentity":"master3.txg.com","leaseDurationSeconds":15,"acquireTime":"2017-05-08T10:41:08Z","renewTime":"2017-05-09T03:14:27Z","leaderTransitions":0}'

  creationTimestamp: 2017-05-08T10:41:08Z

  name: kube-scheduler

  namespace: kube-system

  resourceVersion: "2347830"

  selfLink: /api/v1/namespaces/kube-system/endpoints/kube-scheduler

  uid: d87a235a-33da-11e7-9eb5-52540081c06a

subsets: []

 

 

6.我们关掉一台集群，测试集群创建yaml看看会怎么样

 

[root@master2 ~]# poweroff

Connection to master2.txg.com closed by remote host.

Connection to master2.txg.com closed.

#可以看到 controller-manager和  scheduler已转移到master3

[root@master1 ~]# tail -f /var/log/messages

May  9 14:16:26 master1 kube-controller-manager: I0509 14:16:26.550307    4532 leaderelection.go:247] lock is held by master3.txg.com and has not yet expired

May  9 14:16:26 master1 kube-scheduler: I0509 14:16:26.574123    4636 leaderelection.go:247] lock is held by master3.txg.com and has not yet expired

May  9 14:16:27 master1 kube-apiserver: W0509 14:16:27.593709    4322 controller.go:392] Resetting endpoints for master service "kubernetes" to &TypeMeta{Kind:,APIVersion:,}

May  9 14:16:29 master1 kube-controller-manager: I0509 14:16:29.708160    4532 leaderelection.go:247] lock is held by master3.txg.com and has not yet expired

 

#看看haproxy状态，进入任意一台node监控页面查看haproxy状态

http://192.168.1.68:5002/haproxy

http://192.168.1.69:5002/haproxy

http://192.168.2.68:5002/haproxy

http://192.168.2.69:5002/haproxy

 

 

#master2已被踢出集群负载

 

集群状态正常

登录任意一台UI

可以正常仿问

http://192.168.1.61:8080/ui

http://192.168.1.62:8080/ui

http://192.168.1.63:8080/ui

 

Kubectl也应该正常

 

[root@master3 ~]# kubectl get cs

NAME                 STATUS    MESSAGE              ERROR

scheduler            Healthy   ok                   

controller-manager   Healthy   ok                   

etcd-1               Healthy   {"health": "true"}   

etcd-2               Healthy   {"health": "true"}   

etcd-0               Healthy   {"health": "true"}   

[root@master3 ~]#  kubectl get all --all-namespaces

NAMESPACE     NAME                          DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE

kube-system   deploy/default-http-backend   1         1         1            1           6d

kube-system   deploy/heapster-v1.2.0.1      1         1         1            1           19d

kube-system   deploy/kube-dns               1         1         1            1           19d

kube-system   deploy/kubernetes-dashboard   1         1         1            1           20d

 

NAMESPACE   NAME                  DESIRED   CURRENT   READY     AGE

default     rc/nginx-controller   1         1         1         3h

 

NAMESPACE     NAME                         CLUSTER-IP      EXTERNAL-IP   PORT(S)             AGE

default       svc/kubernetes               172.1.0.1       <none>        443/TCP             20d

default       svc/nginx-service-nodeport   172.1.64.195    <nodes>       80:30097/TCP        2d

kube-system   svc/default-http-backend     172.1.222.13    <none>        80/TCP              6d

kube-system   svc/heapster                 172.1.10.20     <none>        80/TCP              19d

kube-system   svc/kube-dns                 172.1.0.2       <none>        53/UDP,53/TCP       19d

kube-system   svc/kubernetes-dashboard     172.1.118.216   <nodes>       80:31574/TCP        20d

kube-system   svc/monitoring-grafana       172.1.220.49    <none>        80/TCP              19d

kube-system   svc/monitoring-influxdb      172.1.111.159   <none>        8083/TCP,8086/TCP   19d

kube-system   svc/traefik-web-ui           172.1.41.72     <none>        80/TCP              5d

 

NAMESPACE     NAME                                DESIRED   CURRENT   READY     AGE

kube-system   rs/default-http-backend-673928963   1         1         1         6d

kube-system   rs/heapster-v1.2.0.1-3604517863     1         1         1         19d

kube-system   rs/kube-dns-167683681               1         1         1         19d

kube-system   rs/kubernetes-dashboard-744911765   1         1         1         20d

 

NAMESPACE     NAME                                      READY     STATUS    RESTARTS   AGE

default       po/busybox                                1/1       Running   2          2h

default       po/nginx-controller-sb24q                 1/1       Running   0          3h

kube-system   po/default-http-backend-673928963-m2txz   1/1       Running   0          15h

kube-system   po/heapster-v1.2.0.1-3604517863-l25wx     1/1       Running   0          15h

kube-system   po/kube-dns-167683681-nzb98               4/4       Running   0          15h

kube-system   po/kubernetes-dashboard-744911765-1l0gv   1/1       Running   1          2d

kube-system   po/traefik-ingress-controller-2wnnz       1/1       Running   1          5d

kube-system   po/traefik-ingress-controller-2xrf8       1/1       Running   1          5d

kube-system   po/traefik-ingress-controller-4xx72       1/1       Running   1          5d

kube-system   po/traefik-ingress-controller-cv0bt       1/1       Running   1          5d

[root@master3 ~]# 

 

 

#至此非http方式的配置高可用集群配置完成

2.OK前面的http模式我们已经布署完成了，现在布署https集群模式

基于k8bernets 1.6x集群使用https证书来连接apiserver，前提条件是证书下发到所有节点，所有节点工作正常，存在以下文件

具体证书的制作请参考 宋静超大神的文章

https://github.com/rootsongjc/kubernetes-handbook/blob/master/practice/create-tls-and-secret-key.md

[root@node3 kubernetes]# cd /etc/kubernetes
[root@node3 kubernetes]# ls
bootstrap.kubeconfig  kubelet.kubeconfig  kube-proxy.kubeconfig  ssl  token.csv
[root@node3 kubernetes]# pwd
/etc/kubernetes
[root@node3 kubernetes]# 

首选我们配置haproxy用tcp穿透https即haproxy可不用配置证书，注意此处非http模式

    mode tcp

cat     /etc/haproxy/haproxy.cfg

#---------------------------------------------------------------------
# Example configuration for a possible web application.  See the
# full configuration options online.
#
#   http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------


#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    # to have these messages end up in /var/log/haproxy.log you will
    # need to:
    #
    # 1) configure syslog to accept network log events.  This is done
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    #
    # 2) configure local2 events to go to the /var/log/haproxy.log
    #   file. A line like the following can be added to
    #   /etc/sysconfig/syslog
    #
    #
    log         127.0.0.1 local3


    #      local2.*                 /var/log/haproxy.log
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon


    # turn on stats unix socket
    stats socket /var/lib/haproxy/stats


#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000


#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
#frontend  main *:6443
# stats uri /haproxy
 #   acl url_static       path_beg       -i /static /images /javascript /stylesheets
 #   acl url_static       path_end       -i .jpg .gif .png .css .js


  #  use_backend static          if url_static
#    default_backend             k8s-apiserver


#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
#backend static
#    balance     roundrobin
#    server      static 127.0.0.1:4331 check


#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
#backend k8s-apiserver
listen k8s-apiserver
bind 0.0.0.0:6443
    mode tcp   #tcp模式
    balance     roundrobin
    server  master1.txg.com 192.168.1.61:6443 check  #此处轮寻三台api
    server  master2.txg.com 192.168.1.62:6443 check
    server  master3.txg.com 192.168.1.63:6443 check


#--------------------------------------------------------------------


listen localhost 0.0.0.0:8090
       mode http  
      transparent  
      stats refresh 30s 
       stats uri /haproxy-stats    监控页面

#ok 完成后

#修改三处证书文件

cd /etc/kubernetes/

bootstrap.kubeconfig  kubelet.kubeconfig  kube-proxy.kubeconfig 

server: https://192.168.1.63:6443 为制作证书时使用的apiserver的地址

将server: https://192.168.1.63:6443 这里修改为  https://127.0.0.1:6443

重启相关服务 systemctl restart haproxy.service  kubelet.service  kube-proxy.service 

下发证书文件到所有node节点

#去任意一台master上查看 集群状态

[root@master2 ~]# kubectl get node -o wide
NAME            STATUS    AGE       VERSION   EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION
jenkins-2       Ready     11d       v1.6.4    <none>        CentOS Linux 7 (Core)   4.4.71-1.el7.elrepo.x86_64
node1.txg.com   Ready     11d       v1.6.4    <none>        CentOS Linux 7 (Core)   4.4.71-1.el7.elrepo.x86_64
node2.txg.com   Ready     11d       v1.6.4    <none>        CentOS Linux 7 (Core)   4.4.71-1.el7.elrepo.x86_64
node3.txg.com   Ready     11d       v1.6.4    <none>        CentOS Linux 7 (Core)   4.4.71-1.el7.elrepo.x86_64
node4.txg.com   Ready     11d       v1.6.4    <none>        CentOS Linux 7 (Core)   3.10.0-514.6.2.el7.x86_64

#所有集群节点应该OK，此时关闭任意一台apiserver集群应该能正常工作，haproxy会踢掉无法使用的apiserver节点

#仿问任一 node节点上的haproxy监控界面

http://192.168.2.68:8090/haproxy-stats

应该所有l4 ok

至此https高可用完成