Elasticsearch基础教程之安装

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主机采用的是Ubuntu-desktop-14.04

1、JDK

Elasticsearch依赖Java 7。本文使用的 java version "1.7.0_67"，通过如下命令可以查看JDK版本：

<span style="color:#000099;">   java -version   echo $JAVA_HOME</span>

2、Elasticsearch

http://www.elasticsearch.org/download 里下载。（当前是 1.4.4版本）

对于每个版本，你可以在zip、tar、DEB、RPM类型的包中选择下载。简单起见，我们使用tar包。

curl -L -O https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-1.4.4.tar.gz

tar -xzvf elasticsearch-1.4.4.tar.gz

可以看到生成一个elasticsearch-1.4.4文件夹，下面有如下目录：

bin： elasticsearch相关执行程序，如启动命令(elasticsearch)，默认包括linux和windows的。
config：配置文件，其中 elasticsearch.ym为elasticsearch系统功能相关的配置，如node节点名称等，logging.yml则是log的配置，和系统功能无关。
data: 索引数据文件，按照集群分成不同的文件目录。
lib：依赖的第三方jar包
logs: 日志文件，文件的目录结构和格式取决于于config/logging.yml中的配置。

至此，我们已经准备好开启我们的节点和单节点集群（Windows用户应该运行elasticsearch.bat文件）

然后，我们进入到bin目录下：

      cd elasticsearch-1.4.4/bin     ./elasticsearch

如果一切顺利，你将看到大量的如下信息：
./elasticsearch

<span style="color:#333333;">[2015-03-10 10:28:02,085][INFO ][node                     ] [Kang the Conqueror] version[1.4.4], pid[2685], build[c88f77f/2015-02-19T13:05:36Z][2015-03-10 10:28:02,086][INFO ][node                     ] [Kang the Conqueror] initializing ...[2015-03-10 10:28:02,114][INFO ][plugins                  ] [Kang the Conqueror] loaded [], sites [][2015-03-10 10:28:06,239][INFO ][node                     ] [Kang the Conqueror] initialized[2015-03-10 10:28:06,240][INFO ][node                     ] [Kang the Conqueror] starting ...[2015-03-10 10:28:06,448][INFO ][transport                ] [Kang the Conqueror] bound_address {inet[/0:0:0:0:0:0:0:0:9300]}, publish_address {inet[/172.30.40.72:9300]}[2015-03-10 10:28:06,489][INFO ][discovery                ] [Kang the Conqueror] elasticsearch/2FjTWGy0QmuPr5n7hWwEMg[2015-03-10 10:28:10,275][INFO ][cluster.service          ] [Kang the Conqueror] new_master [Kang the Conqueror][2FjTWGy0QmuPr5n7hWwEMg][hayden-VirtualBox][inet[/172.30.40.72:9300]], reason: zen-disco-join (elected_as_master)[2015-03-10 10:28:10,312][INFO ][http                     ] [Kang the Conqueror] bound_address {inet[/0:0:0:0:0:0:0:0:</span><strong style="color: rgb(51, 51, 51);">9200</strong><span style="color:#333333;">]}, publish_address {inet[/</span><strong><span style="color:#cc0000;">172.30.40.72:9200</span></strong><span style="color:#333333;">]}[2015-03-10 10:28:10,313][INFO ][node                     ] [Kang the Conqueror] started[2015-03-10 10:28:10,351][INFO ][gateway                  ] [Kang the Conqueror] recovered [0] indices into cluster_state[2015-03-10 10:28:40,304][WARN ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark [10%] exceeded on [2FjTWGy0QmuPr5n7hWwEMg][Kang the Conqueror] free: 484.2mb[8.3%], shards will be relocated away from this node[2015-03-10 10:28:40,306][INFO ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark exceeded on one or more nodes, rerouting shards[2015-03-10 10:29:10,293][WARN ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark [10%] exceeded on [2FjTWGy0QmuPr5n7hWwEMg][Kang the Conqueror] free: 484.2mb[8.3%], shards will be relocated away from this node[2015-03-10 10:29:40,293][WARN ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark [10%] exceeded on [2FjTWGy0QmuPr5n7hWwEMg][Kang the Conqueror] free: 484.2mb[8.3%], shards will be relocated away from this node[2015-03-10 10:30:10,294][WARN ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark [10%] exceeded on [2FjTWGy0QmuPr5n7hWwEMg][Kang the Conqueror] free: 484.2mb[8.3%], shards will be relocated away from this node[2015-03-10 10:30:10,297][INFO ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark exceeded on one or more nodes, rerouting shards[2015-03-10 10:30:40,295][WARN ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark [10%] exceeded on [2FjTWGy0QmuPr5n7hWwEMg][Kang the Conqueror] free: 484.2mb[8.3%], shards will be relocated away from this node[2015-03-10 10:31:10,297][WARN ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark [10%] exceeded on [2FjTWGy0QmuPr5n7hWwEMg][Kang the Conqueror] free: 484.2mb[8.3%], shards will be relocated away from this node[2015-03-10 10:31:10,300][INFO ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark exceeded on one or more nodes, rerouting shards[2015-03-10 10:31:40,297][WARN ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark [10%] exceeded on [2FjTWGy0QmuPr5n7hWwEMg][Kang the Conqueror] free: 484.2mb[8.3%], shards will be relocated away from this node[2015-03-10 10:32:10,298][WARN ][cluster.routing.allocation.decider] [Kang the Conqueror] high disk watermark [10%] exceeded on [2FjTWGy0QmuPr5n7hWwEMg][Kang the Conqueror] free: 484.2mb[8.3%], shards will be relocated away from this node</span>

至此系统启动完毕，也要注意一下有http标记的那一行，它提供了有关HTTP地址（172.30.40.72）和端口（9200）的信息，通过这个地址和端口我们就可以访问我们的节点了。

默认情况下，Elasticsearch使用9200来提供对其REST API的访问。如果有必要，这个端口是可以配置的。通过如下url请求验证启动状态(http://172.30.40.72:9200/)：

{  "status" : 200,  "name" : "Quasar",  "cluster_name" : "elasticsearch",  "version" : {    "number" : "1.4.4",    "build_hash" : "c88f77ffc81301dfa9dfd81ca2232f09588bd512",    "build_timestamp" : "2015-02-19T13:05:36Z",    "build_snapshot" : false,    "lucene_version" : "4.10.3"  },  "tagline" : "You Know, for Search"}

此外我们可以看到，启动的时候会有一个节点成为默认的master。
注1： 可以覆盖集群或者节点的名字，只需Elasticsearch的时候通过命令行来指定，如下：
./elasticsearch --cluster.name my_cluster_name --node.name my_node_name

注2： 可以通过在启动时增加“-d”参数让其在后台运行：

./elasticsearch -d -Xms512m -Xmx512m

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