elasticsearch 是非常流行的全文搜索引擎，但网上的教程多是初次使用，并没有一些高级用法demo。这次遇到需要跨网段组网问题，自己摸索了文档很久，发现确实可行，于是着手做了个实验，最终实验成功。在跨网段下实现了自动发现和组网。
总共运行了三个节点，一个节点IP是192.168.45.67，另外两个节点IP都是172.20.5.161三个文件的配置文件都改为如下配置文件，先后启动三个节点，记录日志在后面。
192.168.45.67节点启动后，自动用9300作为通信端口，将自身作为master节点存在。
172.20.5.161节点启动后，自动用9300作为通信端口，发现hosts列表中有master存在，master将其加入集群中。
172.20.5.161节点启动后，发现9300被占用，自动用9301作为通信端口，发现hosts列表中有master存在，master将其加入集群中。
192.168.45.67：9300添加日志
172.20.5.161：9300添加日志
172.20.5.161：9301添加
elasticsearch-1.5.2/config/elasticsearch.yml需要修改部分为
discovery.zen.ping.multicast.enabled和discovery.zen.ping.unicast.hosts，修改如下：
################################## Discovery ################################## # Discovery infrastructure ensures nodes can be found within a cluster
# and master node is elected. Multicast discovery is the default. # Set to ensure a node sees N other master eligible nodes to be considered
# operational within the cluster. This should be set to a quorum/majority of
# the master-eligible nodes in the cluster.
#
#discovery.zen.minimum_master_nodes: 1 # Set the time to wait for ping responses from other nodes when discovering.
# Set this option to a higher value on a slow or congested network
# to minimize discovery failures:
#
#discovery.zen.ping.timeout: 3s # For more information, see
# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/modules-discovery-zen.html> # Unicast discovery allows to explicitly control which nodes will be used
# to discover the cluster. It can be used when multicast is not present,
# or to restrict the cluster communication-wise.
#
# 1. Disable multicast discovery (enabled by default):
#
discovery.zen.ping.multicast.enabled: false
#
# 2. Configure an initial list of master nodes in the cluster
# to perform discovery when new nodes (master or data) are started:
#
discovery.zen.ping.unicast.hosts: ["192.168.45.67", "172.20.5.161:9300"] # EC2 discovery allows to use AWS EC2 API in order to perform discovery.
#
# You have to install the cloud-aws plugin for enabling the EC2 discovery.
#
# For more information, see
# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/modules-discovery-ec2.html>
#
# See <http://elasticsearch.org/tutorials/elasticsearch-on-ec2/>
# for a step-by-step tutorial. # GCE discovery allows to use Google Compute Engine API in order to perform discovery.
#
# You have to install the cloud-gce plugin for enabling the GCE discovery.
#
# For more information, see <https://github.com/elasticsearch/elasticsearch-cloud-gce>. # Azure discovery allows to use Azure API in order to perform discovery.
#
# You have to install the cloud-azure plugin for enabling the Azure discovery.
#
# For more information, see <https://github.com/elasticsearch/elasticsearch-cloud-azure>.
配置的中文注释请看：