Elasticsearch安装

官文地址：在这里

  1. 下载
vagrant@machine2:~$ curl -L -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.4.2-linux-x86_64.tar.gz
  1. 解压
vagrant@machine2:~$ tar xzf elasticsearch-7.4.2-linux-x86_64.tar.gz
  1. 启动
vagrant@machine2:~$ cd elasticsearch-7.4.2/bin/
vagrant@machine2:~/elasticsearch-7.4.2/bin$ ./elasticsearch

出现问题：

could not find java in JAVA_HOME or bundled at /usr/lib/jmv/java-8-openjdk-amd64/bin/java

查看环境变量：

echo $JAVA_HOME
// 得到：
/usr/lib/jmv/java-8-openjdk-amd64

需要注意文档这段话：

Elasticsearch includes a bundled version of OpenJDK from the JDK maintainers (GPLv2+CE). To use your own version of Java, see the JVM version requirements

也就是说自带了jdk，而我自己之前有安装jdk，需要另外配置。通过链接查看额外配置文档。

Elasticsearch is built using Java, and includes a bundled version of OpenJDK from the JDK maintainers (GPLv2+CE) within each distribution. The bundled JVM is the recommended JVM and is located within the jdk directory of the Elasticsearch home directory.

To use your own version of Java, set the JAVA_HOME environment variable. If you must use a version of Java that is different from the bundled JVM, we recommend using a supported LTS version of Java. Elasticsearch will refuse to start if a known-bad version of Java is used. The bundled JVM directory may be removed when using your own JVM.

还是推荐使用自带的jdk，没有细说。也在目录下面看到了jdk目录，那重新设置$JAVA_HOME环境变量到Elasticsearch里面的jdk目录:

export JAVA_HOME=/home/vagrant/elasticsearch-7.4.2/jdk

再次启动，显示了一大堆启动的东西，已经成功了，下面来验证是否启动：

curl 127.0.0.1:9200

// 会得到:
{
  "name" : "iZ23pskgys8Z",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "J2SyY5cZRayLwC1lsPaoGA",
  "version" : {
    "number" : "7.4.2",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "2f90bbf7b93631e52bafb59b3b049cb44ec25e96",
    "build_date" : "2019-10-28T20:40:44.881551Z",
    "build_snapshot" : false,
    "lucene_version" : "8.2.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

得到上面的回应，就说明安装成功了。

  • vagrant 环境下安装

我本地是vagrant+virtualbox搭建的环境。在安装成功后，修改elasticsearch.yml的network将IP绑定在vagrant的IP上，如我的是192.168.56.102，修改55行：

network.host: 192.168.56.102

修改68行：

discovery.seed_hosts:[]

这样，我在windows的浏览器里访问http://192.168.56.102:9200同样成功了。