Failed to send join request to master?

Elastic Stack Elasticsearch
1

I'm a newer to docker,and i want to use docker to deploy elasticsearch.

I follow the document step by step.And i can start a es instance successful.such as docker run -p 9208:9200 -p 9300:9300 -v /data/es1/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml docker.elastic.co/elasticsearch/elasticsearch:5.2.2.

But when i want to add the node to a exist cluster,and add a config discovery.zen.ping.unicast.hosts: ["xxx1:9300","xxx2:9300","xxx3:9300"] in /data/es1/elasticsearch.yml,but it throws an exception:

failed to send join request to master [{es130-data}{FwWjvb52RzGRP2IRa15DeA}{owS9GmMXTAqn0kioUtGmtw}{xxx}{xxx:9301}{box_type=warm, master=false}], reason [RemoteTransportException[[es130-data][xxx:9301][internal:discovery/zen/join]]; nested: ConnectTransportException[[ddFr9ut][172.17.0.2:9300] connect_timeout[30s]]; nested: IOException[No route to host: 172.17.0.2/172.17.0.2:9300]; ]

Here are my all configs:

cluster.name: skynet
cluster.routing.allocation.same_shard.host: true
node.attr.box_type: warm
node.attr.master: true
node.data: true
discovery.zen.ping.unicast.hosts: ["xxx1:9300","xxx2:9300","xxx3:9300"]
network.host: [_site_,_local_]
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