Centos7 安装Elasticsearch

    一. 使用RPM方式安装
        1. 下载并安装公共签名密钥
          $ rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

        2. 在/etc/yum.repos.d/下创建elasticsearch.repo 并写入以下内容
          $ [elasticsearch]
            name=Elasticsearch repository for 8.x packages
            baseurl=https://artifacts.elastic.co/packages/8.x/yum
            gpgcheck=1
            gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
            enabled=0
            autorefresh=1
            type=rpm-md

        3. yum 安装
          $ sudo yum install --enablerepo=elasticsearch elasticsearch

        4. 设置自动启动
          $ sudo /bin/systemctl daemon-reload
          $ sudo /bin/systemctl enable elasticsearch.service

        5. Elasticsearch 相关命令
          $ sudo systemctl start elasticsearch.service
          $ sudo systemctl stop elasticsearch.service
          $ sudo systemctl status elasticsearch.service

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