Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "We can add the cloud ID of Elasticsearch under the Elastic Cloud section in the metricbeat.yml file."

A block of code is set as follows:

input 
{
    file 
    {
        path => "/var/log/apache.log"
        type => "apache-access"  
        start_position => "beginning"
    }  
}
filter 
{
   grok 
   {
      match => [ "message", "%{COMBINEDAPACHELOG}" ]
   }
}
output 
{
    elasticsearch 
    {    
        hosts => ["localhost:9200"] 
    }
}

Any command-line input or output is written as follows:

/usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/crimes.conf

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: Select System info from the Administration panel.