Elasticsearch7.3 study notes 2- Installation and Configuration

A, jdk installation
1. Download the JDK
.JDK Download: Click direct link to the official website to download add description

2. Extract and install
tar -zxvf the JDK-11.0.4_linux-x64_bin.tar.gz
mkdir -p / usr / local / the JDK /
Music Videos JDK-11.0.4 / usr / local / JDK /
3. configure the environment variables
VI / etc / Profile
Export the JAVA_HOME = / usr / local / JDK / JDK-11.0.4
Export the JAVA_HOME $ the PATH = / bin: $ the PATH
Export = the CLASSPATH:. $ the JAVA_HOME / lib / Dt.jar: $ the JAVA_HOME / lib
4. compile
Source / etc / Profile
5. The view
java -version

two, es install and configure
1. Download
wget https://artifacts.elastic.co /downloads/elasticsearch/elasticsearch-7.3.0-linux-x86_64.tar.gz
2. extract the
tar -zxvf elasticsearch-7.3.0-linux- x86_64.tar.gz

3. New account and authorize
   Elasticsearch # requires super user root can not be used to run, so we set up a test account
   groupadd testes

           useradd testesuser -g testes -p 123456
   
           然后，给testesuser用户elasticsearch目录的授权。
   
           chown -R testesuser:testes /usr/local/es/
           切换至elasticsearch目录，并以testesuser用户运行
   
           su testesuser
           这个用户专门用来给es操作的，如启动，暂停等。。。
   4.启动服务
        在es安装目录下进入bin文件夹
        运行elasticsearch，如果想后台运行后面加 -d，es默认会启动http 9200端口,tcp 9300端口
    5.防火墙添加
        firewall-cmd --zone=public --add-port=9200/tcp --permanent
        firewall-cmd --zone=public --add-port=9300/tcp --permanent
        firewall-cmd --reload
   6.测试
      方法1  直接通过浏览器测试

   
   Test Method 2 curl
   curl HTTP: // localhost: 9200
   
   Third, the directory structure
   • home directory: Use $ ES_HOME expressed
   • bin /: location $ ES_HOME / bin, contains elasticsearch and elasticsearch-plugin scripting
   • conf /: $ Location ES_HOME / config, and contains the profile elasticsearch.yml log4j2.properties, using path.conf specified
   • data /: location $ ES_HOME / data, comprising for each index / shard data file, a plurality of positions can be specified, using the path .data specified
   • logs /: location $ ES_HOME / logs, use path.logs specified
   • plguins /: location ES_HOME $ / plugins
   • repo /: use path.repo specified, no default position, indicates the position of the shared file system repository. You can specify a plurality of positions.
   • script /: location $ ES_HOME / scripts, use path.scripts specified.

Fourth, start the service being given to solve
1.curl port error
. Curl http://192.168.43.96:9200 rejected the connection

默认是通过127.0.0.1启动的 ，需要修改配置文件

network.host: 192.168.43.96
http.port: 9200
2.ERROR: bootstrap checks failed
max file descriptors [10240] for elasticsearch process likely too low, increase to at least [65536]
切换到root用户
vi /etc/security/limits.conf
#添加如下内容:

• soft nofile 65536
• hard nofile 131072
• soft nproc 4096

• hard nproc 4096
  修改/etc/sysctl.conf
  #添加下面配置：
  vm.max_map_count=655360
  执行命令：

  sysctl -p

  注意：如果仍然提示异常

  max file **

  max number **

  max virtual **

  The above parameters can file size can be adjusted to solve the prompts.
  sysctl -p save command execution
  3.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
  to modify XX-nproc.conf (different machines XX is not the same, you can view the first-cd /etc/security/limits.d/)

  vi /etc/security/limits.d/20-nproc.conf
  *          soft    nproc     4096（改为4096，原来为1024）
  在 elasticsearch.yml中添加配置项：bootstrap.system_call_filter为false：
  bootstrap.memory_lock: false
  bootstrap.system_call_filter: false
  cluster.initial_master_nodes: ["node-1"]