marathon上部署marathon-lb服務發現與負載均衡

1) docker pull mesosphere/marathon-lb

marathon-lb的鏡像配置json文件
重命名爲marathon-lb.json
{
"id": "marathon-lb",
"instances": 1,
"constraints": [["hostname", "UNIQUE"]],
"container": {
"type": "DOCKER",
"docker": {
"image": "docker.io/mesosphere/marathon-lb",
"privileged": true,
"network": "HOST"
}
},
"args": ["sse", "-m","http://master1_ip:8080","--group", "external"]
}
部署
curl -i -H 'Content-Type: application/json' 172.31.17.71:8080/v2/apps -d@marathon-lb.json

注意裏面的master1_ip是marathon的ip

注意group後面的external參數

這時候回過頭來看docker_nginx.json文件

[root@centos7 mywork]# cat docker_nginx.json 
{
  "id":"nginx",
  "labels": {
     "HAPROXY_GROUP":"external",
     "HAPROXY_0_VHOST":"nginx.marathon.mesos"
  },
  "cpus":0.2,
  "mem":20.0,
  "instances": 2,
  "healthChecks": [{ "path": "/" }],
  "container": {
    "type":"DOCKER",
    "docker": {
     "image": "nginx",
     "network": "BRIDGE",
     "portMappings":[{"containerPort":80,"hostPort":0,"servicePort":80,"protocol":"tcp"}]
    }
  }
}

注意

1) containerPort爲80,是指容器內的端口

2) hostPort是當前主機映射到contenterPort的端口,對應的.

56fc5bb6d80d        nginx                                           "nginx -g 'daemon off"   10 minutes ago      Up 10 minutes       443/tcp, 0.0.0.0:31757->80/tcp   mesos-c3bcff71-e3ac-455f-b228-e350f7aa5035-S0.5914a1f4-378e-4b7d-a19d-caf07a563c9d

若是hostPort爲0的話,則說明是隨機的,

3) serverPort是marathon-lb須要配置的haproxy代理暴露的端口,則設置爲80.

     這時候進入marathon-lb的容器裏面,查看生成的haproxy.cfg文件

     這是最後面一段新生成的

frontend nginx_80
  bind *:80
  mode http
  use_backend nginx_80

backend nginx_80
  balance roundrobin
  mode http
  option forwardfor
  http-request set-header X-Forwarded-Port %[dst_port]
  http-request add-header X-Forwarded-Proto https if { ssl_fc }
  option  httpchk GET /
  timeout check 20s
  server centos7_1_10_57_137_131_31757 10.57.137.131:31757 check inter 60s fall 4
  server centos7_1_10_57_137_131_31834 10.57.137.131:31834 check inter 60s fall 4

  這時候訪問haproxy的80端口,則是請求到後端的2臺nginx的主機上了.

4) 查看haproxy的監控頁面

   查看方法

API endpoints

Marathon-lb exposes a few endpoints on port 9090 (by default). They are:

Endpoint	Description
:9090/haproxy?stats	HAProxy stats endpoint. This produces an HTML page which can be viewed in your browser, providing various statistics about the current HAProxy instance.
:9090/haproxy?stats;csv	This is a CSV version of the stats above, which can be consumed by other tools. For example, it's used in the zdd.py script.
:9090/_haproxy_health_check	HAProxy health check endpoint. Returns 200 OK if HAProxy is healthy.
:9090/_haproxy_getconfig	Returns the HAProxy config file as it was when HAProxy was started. Implemented ingetconfig.lua.
:9090/_haproxy_getpids	Returns the PIDs for all HAProxy instances within the current process namespace. This literally returns $(pidof haproxy). Implemented in getpids.lua. This is also used by the zdd.py script to determine if connections have finished draining during a deploy.

最痛苦的就是docker pull ,太慢了....