安装部署Elastic Search

1. 在/home/目录下新建elastic文件夹,切换该文件下.

   cd /home
   mkdir elastic
   cd elastic
   

2. 下载wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.3.2-linux-x86_64.tar.gz

3. 解压。tar -zxvf elasticsearch-7.3.2-linux-x86_64.tar.gz

4. 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。

5. 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
   

6. 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"
   }
   

7. 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.

8. 参考资料：

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

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