安装部署Elastic Search

在/home/目录下新建elastic文件夹,切换该文件下.
```
cd /home
mkdir elastic
cd elastic
```
下载wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.3.2-linux-x86_64.tar.gz
解压。tar -zxvf elasticsearch-7.3.2-linux-x86_64.tar.gz

启动sh elasticsearch

会发现报错了，报错信息：

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
[2019-09-24T10:27:40,249][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [localhost.localdomain] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
 at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-7.3.2.jar:7.3.2]
 at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-7.3.2.jar:7.3.2]
 at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.3.2.jar:7.3.2]
 at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-7.3.2.jar:7.3.2]
 at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.3.2.jar:7.3.2]
 at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) ~[elasticsearch-7.3.2.jar:7.3.2]
 at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.3.2.jar:7.3.2]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
 at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105) ~[elasticsearch-7.3.2.jar:7.3.2]
 at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) ~[elasticsearch-7.3.2.jar:7.3.2]
 at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349) ~[elasticsearch-7.3.2.jar:7.3.2]
 at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-7.3.2.jar:7.3.2]
 ... 6 more

意思是不能用root用户来启动，那我们新建一个用户来启动。

useradd elastic
chown -R elastic:elastic elasticsearch-7.3.2
su elastic
sh elasticsearch-7.3.2/bin/elasticsearch

这时启动成功。但是现在是前台启动，我们可以Ctrl + C退出，然后sh elasticsearch-7.3.2/bin/elasticsearch -d的命令后台启动。

启动后可使用ps -ef | grep elasticsearch查看进程。

elastic  14992     1 99 10:31 pts/1    00:00:24 /home/elastic/elasticsearch-7.3.2/jdk/bin/java -Xms1g -Xmx1g -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Des.networkaddress.cache.ttl=60 -Des.networkaddress.cache.negative.ttl=10 -XX:+AlwaysPreTouch -Xss1m -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djna.nosys=true -XX:-OmitStackTraceInFastThrow -Dio.netty.noUnsafe=true -Dio.netty.noKeySetOptimization=true -Dio.netty.recycler.maxCapacityPerThread=0 -Dlog4j.shutdownHookEnabled=false -Dlog4j2.disable.jmx=true -Djava.io.tmpdir=/tmp/elasticsearch-13731651965100738695 -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=data -XX:ErrorFile=logs/hs_err_pid%p.log -Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m -Djava.locale.providers=COMPAT -Dio.netty.allocator.type=unpooled -XX:MaxDirectMemorySize=536870912 -Des.path.home=/home/elastic/elasticsearch-7.3.2 -Des.path.conf=/home/elastic/elasticsearch-7.3.2/config -Des.distribution.flavor=default -Des.distribution.type=tar -Des.bundled_jdk=true -cp /home/elastic/elasticsearch-7.3.2/lib/* org.elasticsearch.bootstrap.Elasticsearch -d
elastic  15008 14992  0 10:31 pts/1    00:00:00 /home/elastic/elasticsearch-7.3.2/modules/x-pack-ml/platform/linux-x86_64/bin/controller
elastic  15024 14732  0 10:31 pts/1    00:00:00 grep --color=auto elasticsearch

测试访问,curl http://localhost:9200。显示如下信息：

{
  "name" : "localhost.localdomain",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "VFVnijYtRSOOaLP0HP37ow",
  "version" : {
    "number" : "7.3.2",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "1c1faf1",
    "build_date" : "2019-09-06T14:40:30.409026Z",
    "build_snapshot" : false,
    "lucene_version" : "8.1.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

在宿主机外部电脑访问，失败。

报错

ERROR: [2] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured

切换root用户，vi /etc/security/limits.conf

在倒数第二行

* soft nofile 65536
* hard nofile 65536
# End of file

vi /etc/sysctl.conf添加

vm.max_map_count=655360

保存后执行sysctl -p。

启动，报错

ERROR: [1] bootstrap checks failed
[1]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured

修改elasticsearch.yml，取消注释保留一个节点
cluster.initial_master_nodes: ["node-1","node-2"]

再次启动，ok。在外部浏览器访问：http://ip:9200

{
  "name" : "localhost.localdomain",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "VFVnijYtRSOOaLP0HP37ow",
  "version" : {
    "number" : "7.3.2",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "1c1faf1",
    "build_date" : "2019-09-06T14:40:30.409026Z",
    "build_snapshot" : false,
    "lucene_version" : "8.1.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

ok.

参考资料：

https://blog.csdn.net/happyzxs/article/details/89156068

http://blog.java1234.com/blog/articles/342.html

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安装部署Elastic Search

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