Example core-site.xml file with S3 credential

<?xml version="1.0"?>
      <?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
      <configuration>
      <include xmlns="http://www.w3.org/2001/XInclude"
      href="/etc/hadoop/conf/core-site.xml">
      <fallback />
      </include>
      
      <property>
      <name>fs.s3a.access.key</name>
      <value>Amazon S3 Access Key</value>
      </property>
      
      <property>
      <name>fs.s3a.secret.key</name>
      <value>Amazon S3 Secret Key</value>
      </property>
      </configuration>