sudo /usr/share/logstash/bin/logstash -f ./logstash_mysql.conf

`sudo /usr/share/logstash/bin/logstash -f ./logstash_mysql.conf` 这个命令是在Linux或Unix系统中运行Logstash这个工具的命令行方式。Logstash是一个开源的数据处理管道，主要用于收集、过滤和将各种数据源（如日志文件、数据库等）转化为结构化的数据，以便进一步分析或整合。

- `sudo`：这是一个超级用户权限执行的前缀，用于运行需要更高权限的命令，如更改系统设置或访问系统资源。
- `/usr/share/logstash/bin/logstash`：这是Logstash可执行文件的路径，`bin`目录通常包含系统的可执行程序。
- `-f`：表示使用指定的配置文件（file）选项，`./logstash_mysql.conf` 是Logstash要读取的配置文件，位于当前目录下，它定义了Logstash如何解析和处理数据的具体规则。

这个命令的作用是启动Logstash进程，并使用`./logstash_mysql.conf`中的配置来配置Logstash如何从MySQL数据库中提取数据并进行处理。相关问题：

1. Logstash是什么，它的主要功能是什么？
2. 配置文件`logstash_mysql.conf`是如何影响Logstash行为的？
3. 如果在执行过程中遇到权限问题，应该怎么做？

相关问题

logstash安装教程

以下是在 Ubuntu 系统上安装 Logstash 的步骤：

1. 安装 Java：Logstash 是基于 Java 开发的，因此需要先安装 Java。在终端输入以下命令：

   sudo apt install openjdk-8-jdk

2. 导入 Logstash GPG 密钥：

   wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -

3. 添加 Logstash 软件包源：

   echo "deb https://artifacts.elastic.co/packages/7.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-7.x.list

4. 更新软件包列表：

   sudo apt update

5. 安装 Logstash：

   sudo apt install logstash

6. 启动 Logstash：

   sudo systemctl start logstash

7. 验证 Logstash 是否在运行：

   sudo systemctl status logstash

如果 Logstash 启动成功，你应该能够看到类似于以下的输出：

● logstash.service - logstash
   Loaded: loaded (/usr/lib/systemd/system/logstash.service; disabled; vendor preset: enabled)
   Active: active (running) since Tue 2019-04-23 16:39:23 UTC; 3s ago
 Main PID: 20134 (java)
    Tasks: 21
   Memory: 114.5M
      CPU: 2.228s
   CGroup: /system.slice/logstash.service
           └─20134 /usr/bin/java -Xms256m -Xmx1g -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djruby.compile.invokedynamic=true -Djruby.jit.threshold=0 -Djava.security.egd=file:/dev/urandom -Dlogstash.home=/usr/share/logstash -Dlogstash.config.path=/etc/logstash/conf.d -Dlogstash.log.dir=/var/log/logstash -Djava.io.tmpdir=/tmp/logstash -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/lib/logstash -XX:ErrorFile=/var/log/logstash/hs_err_pid%p.log -cp /usr/share/logstash/logstash-core/lib/jars/animal-sniffer-annotations-1.14.jar:/usr/share/logstash/logstash-core/lib/jars/commons-codec-1.11.jar:/usr/share/logstash/logstash-core/lib/jars/commons-compiler-3.0.10.jar:/usr/share/logstash/logstash-core/lib/jars/error_prone_annotations-2.0.19.jar:/usr/share/logstash/logstash-core/lib/jars/hdr_histogram-2.1.9.jar:/usr/share/logstash/logstash-core/lib/jars/hsqldb-2.4.0.jar:/usr/share/logstash/logstash-core/lib/jars/jackson-core-2.8.11.jar:/usr/share/logstash/logstash-core/lib/jars/jackson-dataformat-cbor-2.8.11.jar:/usr/share/logstash/logstash-core/lib/jars/jackson-dataformat-yaml-2.8.11.jar:/usr/share/logstash/logstash-core/lib/jars/janino-3.0.10.jar:/usr/share/logstash/logstash-core/lib/jars/javassist-3.22.0-CR2.jar:/usr/share/logstash/logstash-core/lib/jars/jruby-complete-9.2.6.0.jar:/usr/share/logstash/logstash-core/lib/jars/log4j-api-2.10.0.jar:/usr/share/logstash/logstash-core/lib/jars/log4j-core-2.10.0.jar:/usr/share/logstash/logstash-core/lib/jars/log4j-slf4j-impl-2.10.0.jar:/usr/share/logstash/logstash-core/lib/jars/logstash-core.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-analyzers-common-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-backward-codecs-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-core-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-grouping-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-highlighter-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-join-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-memory-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-misc-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-queries-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-queryparser-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-sandbox-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-spatial3d-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-spatial-extras-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-spatial-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/lucene-suggest-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/netty-all-4.1.24.Final.jar:/usr/share/logstash/logstash-core/lib/jars/opencensus-api-0.15.0.jar:/usr/share/logstash/logstash-core/lib/jars/opencensus-contrib-grpc-metrics-0.15.0.jar:/usr/share/logstash/logstash-core/lib/jars/parent-join-client-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/parent-join-common-7.5.0.jar:/usr/share/logstash/logstash-core/lib/jars/protobuf-java-3.6.1.jar:/usr/share/logstash/logstash-core/lib/jars/roaringbitmap-0.7.45.jar:/usr/share/logstash/logstash-core/lib/jars/snakeyaml-1.23.jar:/usr/share/logstash/logstash-core/lib/jars/sockslib-1.1.2.jar:/usr/share/logstash/logstash-core/lib/jars/taggi-1.0.jar:/usr/share/logstash/logstash-core/lib/jars/t-digest-3.2.jar org.logstash.Logstash
   Apr 23 16:39:23 ubuntu systemd[1]: Started logstash.

现在你已经成功安装了 Logstash。

linux logstash下载7.15.2

Logstash是一个强大的日志管理和数据处理工具，用于收集、过滤、转换和输出各种数据源的日志。如果你想下载Logstash 7.15.2版本，你可以按照以下步骤操作：

1. **访问官方网站**: 首先，访问Logstash的官方GitHub仓库 https://github.com/elastic/logstash。

2. **查找特定版本**: 在仓库页面上，找到"releases"标签页，你会看到各个版本的下载链接。搜索 "7.15.2" 版本。

3. **选择适合平台的包**：Logstash有针对多种平台（如Linux、Windows等）的安装包，确保选择适用于你的系统的那个。通常会有.zip, .tar.gz 或者.deb/.rpm格式的文件。

4. **下载并解压**：点击对应的下载链接，保存到本地，然后解压缩到你希望安装的位置，比如 `/opt` 或 `/usr/local`.

5. **运行安装脚本**：如果是Linux发行版提供的RPM或DEB包，可以用`sudo dpkg -i`或`sudo yum install`命令直接安装；如果是从源码编译，需要先编译再安装。

6. **配置和启动**：安装完成后，编辑`logstash.yml`或`logstash.conf`配置文件，然后通过`bin/logstash -f <config_file>`命令启动Logstash服务。