dcos - marathon -lb 问题

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marathon-lb的稳定性问题

假设在内部，程序A去调用程序B使用api api-b，一共三个节点，通过域名api-b.marathon.mesos，解析出来的A记录有三个，当然，解析出来的都是lb的地址，如果lb有一个挂了会有啥结果。短时间内是不是会造成502.

marathon-lb居然也有保留端口

marathon-lb居然还保留了端口。By default, port 10000 through to 10100 are reserved for marathon-lb services

marathon-lb的virtual host

知道marathon-lb有强大的端口转发能力，没想到，居然也有http和https的virtual host功能哦。 An important feature of marathon-lb is support for virtual hosts。
AWS为例，创建两个LB，检车是marathon-lb宿主机，端口9090，path /_haproxy_health_check.
externalnginx配置如下

{  "id": "nginx-external",  "container": {    "type": "DOCKER",    "docker": {      "image": "nginx:1.7.7",      "network": "BRIDGE",      "portMappings": [        { "hostPort": 0, "containerPort": 80, "servicePort": 10000 }      ],      "forcePullImage":true    }  },  "instances": 1,  "cpus": 0.1,  "mem": 65,  "healthChecks": [{      "protocol": "HTTP",      "path": "/",      "portIndex": 0,      "timeoutSeconds": 10,      "gracePeriodSeconds": 10,      "intervalSeconds": 2,      "maxConsecutiveFailures": 10  }],  "labels":{    "HAPROXY_GROUP":"external",    "HAPROXY_0_VHOST":"brenden-j-PublicSl-1LTLKZEH6B2G6-1145355943.us-west-2.elb.amazonaws.com（这个地址是AWS LB的地址）"  }}

这里写图片描述

参考：
https://mesosphere.com/blog/2015/12/04/dcos-marathon-lb/

如何更快地做出反应

使用 Marathon Event Bus

marathon-lb里面的参数还可以修改

可以，使用template-url

{  "marathon-lb":{  "template-url":"https://downloads.mesosphere.com/marathon/marathon-lb/templates.tgz"   }}

重新运行

dcos package install --options=options.json marathon-lb

marathon-lab支持 ssl

"labels":{  "HAPROXY_0_VHOST":"nginx.mesosphere.com",  "HAPROXY_0_SSL_CERT":"/etc/ssl/certs/nginx.mesosphere.com"}

自动扩容

牛来个叉

marathon-lb-autoscale

参考：
https://mesosphere.com/blog/2015/12/13/service-discovery-and-load-balancing-with-dcos-and-marathon-lb-part-2/

扩展下

　AWS ELB是几层负载

http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-listener-config.html

Elastic Load Balancing supports the following protocols:

HTTP
HTTPS (secure HTTP)
TCP
SSL (secure TCP)

Load balancers can listen on the following ports:

[EC2-VPC] 1-65535
[EC2-Classic] 25, 80, 443, 465, 587, 1024-65535

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