Hi,
I have build my ELK stack on local machine (ELK version- 6.8.10) . In order to get more details like machine/server serial number, I have added few entries in filebeat.yml file.
After adding few lines under add_host_metadata section, I took restart of filebeat service and post that service is successfully up and running fine.
But I am not able to view serial_number field in my kibana dashboard (after discovering filebeat index). Also there is one field in filebeat output which is "host.id" , I have no idea that what information is this ?? I have already crossed checked my instance and serial number with host.id output , unfortunately it is not matching with any of the outputs.
Please have a look on below filebeat.yml file and share further suggestion to resolve this issue ASAP. 
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[root@XXXXX~]# cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
[root@XXXXX ~]# systemctl status filebeat.service -l
● filebeat.service - Filebeat sends log files to Logstash or directly to Elasticsearch.
Loaded: loaded (/usr/lib/systemd/system/filebeat.service; enabled; vendor preset: disabled)
Active: active (running) since Sat 2020-06-27 12:36:32 UTC; 27min ago
Docs: https://www.elastic.co/products/beats/filebeat
Main PID: 49249 (filebeat)
CGroup: /system.slice/filebeat.service
└─49249 /usr/share/filebeat/bin/filebeat -c /etc/filebeat/filebeat.yml -path.home /usr/share/filebeat -path.config /etc/filebeat -path.data /var/lib/filebeat -path.logs /var/log/filebeat
Jun 27 12:36:32 XXXX systemd[1]: Started Filebeat sends log files to Logstash or directly to Elasticsearch..
[root@XXXX ~]#
[root@xxxxxx ~]# cat /etc/filebeat/filebeat.yml
###################### Filebeat Configuration Example #########################
This file is an example configuration file highlighting only the most common
options. The filebeat.reference.yml file from the same directory contains all the
supported options with more comments. You can use it as a reference.
You can find the full configuration reference here:
https://www.elastic.co/guide/en/beats/filebeat/index.html
For more available modules and options, please see the filebeat.reference.yml sample
configuration file.
#=========================== Filebeat inputs =============================
filebeat.inputs:
Each - is an input. Most options can be set at the input level, so
you can use different inputs for various configurations.
Below are the input specific configurations.
-
type: log
Change to true to enable this input configuration.
enabled: false
Paths that should be crawled and fetched. Glob based paths.
paths:
- /var/log/*.log
#- c:\programdata\elasticsearch\logs*
Exclude lines. A list of regular expressions to match. It drops the lines that are
matching any regular expression from the list.
#exclude_lines: ['^DBG']
Include lines. A list of regular expressions to match. It exports the lines that are
matching any regular expression from the list.
#include_lines: ['^ERR', '^WARN']
Exclude files. A list of regular expressions to match. Filebeat drops the files that
are matching any regular expression from the list. By default, no files are dropped.
#exclude_files: ['.gz$']
Optional additional fields. These fields can be freely picked
to add additional information to the crawled log files for filtering
#fields:
level: debug
review: 1
Multiline options
Multiline can be used for log messages spanning multiple lines. This is common
for Java Stack Traces or C-Line Continuation
The regexp Pattern that has to be matched. The example pattern matches all lines starting with [
#multiline.pattern: ^[
Defines if the pattern set under pattern should be negated or not. Default is false.
#multiline.negate: false
Match can be set to "after" or "before". It is used to define if lines should be append to a pattern
that was (not) matched before or after or as long as a pattern is not matched based on negate.
Note: After is the equivalent to previous and before is the equivalent to to next in Logstash
#multiline.match: after
- /var/log/*.log
#============================= Filebeat modules ===============================
filebeat.config.modules:
Glob pattern for configuration loading
path: ${path.config}/modules.d/*.yml
Set to true to enable config reloading
reload.enabled: false
Period on which files under path should be checked for changes
#reload.period: 10s
#==================== Elasticsearch template setting ==========================
setup.template.settings:
index.number_of_shards: 3
#index.codec: best_compression
#_source.enabled: false
#================================ General =====================================
The name of the shipper that publishes the network data. It can be used to group
all the transactions sent by a single shipper in the web interface.
#name:
The tags of the shipper are included in their own field with each
transaction published.
#tags: ["service-X", "web-tier"]
Optional fields that you can specify to add additional information to the
output.
#fields:
env: staging
#============================== Dashboards =====================================
These settings control loading the sample dashboards to the Kibana index. Loading
the dashboards is disabled by default and can be enabled either by setting the
options here, or by using the -setup CLI flag or the setup command.
#setup.dashboards.enabled: false
The URL from where to download the dashboards archive. By default this URL
has a value which is computed based on the Beat name and version. For released
versions, this URL points to the dashboard archive on the artifacts.elastic.co
website.
#setup.dashboards.url:
#============================== Kibana =====================================
Starting with Beats version 6.0.0, the dashboards are loaded via the Kibana API.
This requires a Kibana endpoint configuration.
setup.kibana:
Kibana Host
Scheme and port can be left out and will be set to the default (http and 5601)
In case you specify and additional path, the scheme is required: http://localhost:5601/path
IPv6 addresses should always be defined as: https://[2001:db8::1]:5601
host: "localhost:5601"
Kibana Space ID
ID of the Kibana Space into which the dashboards should be loaded. By default,
the Default Space will be used.
#space.id:
#============================= Elastic Cloud ==================================
These settings simplify using filebeat with the Elastic Cloud (https://cloud.elastic.co/).
The cloud.id setting overwrites the output.elasticsearch.hosts and
setup.kibana.host options.
You can find the cloud.id in the Elastic Cloud web UI.
#cloud.id:
The cloud.auth setting overwrites the output.elasticsearch.username and
output.elasticsearch.password settings. The format is <user>:<pass>.
#cloud.auth:
#================================ Outputs =====================================
Configure what output to use when sending the data collected by the beat.
#-------------------------- Elasticsearch output ------------------------------
#output.elasticsearch:
Array of hosts to connect to.
hosts: ["localhost:9200"]
Enabled ilm (beta) to use index lifecycle management instead daily indices.
#ilm.enabled: false
Optional protocol and basic auth credentials.
#protocol: "https"
#username: "elastic"
#password: "changeme"
#----------------------------- Logstash output --------------------------------
output.logstash:
The Logstash hosts
hosts: ["localhost:5044"]
Optional SSL. By default is off.
List of root certificates for HTTPS server verifications
#ssl.certificate_authorities: ["/etc/pki/root/ca.pem"]
Certificate for SSL client authentication
#ssl.certificate: "/etc/pki/client/cert.pem"
Client Certificate Key
#ssl.key: "/etc/pki/client/cert.key"
#================================ Processors =====================================
Configure processors to enhance or manipulate events generated by the beat.
processors:
- add_host_metadata:
server_details:
name: xxxxxx
serial_number: 0000-0009-3938-xxx-3444-06 - add_cloud_metadata: ~
#================================ Logging =====================================
Sets log level. The default log level is info.
Available log levels are: error, warning, info, debug
#logging.level: debug
At debug level, you can selectively enable logging only for some components.
To enable all selectors use ["*"]. Examples of other selectors are "beat",
"publish", "service".
#logging.selectors: ["*"]
#============================== Xpack Monitoring ===============================
filebeat can export internal metrics to a central Elasticsearch monitoring
cluster. This requires xpack monitoring to be enabled in Elasticsearch. The
reporting is disabled by default.
Set to true to enable the monitoring reporter.
#xpack.monitoring.enabled: false
Uncomment to send the metrics to Elasticsearch. Most settings from the
Elasticsearch output are accepted here as well. Any setting that is not set is
automatically inherited from the Elasticsearch output configuration, so if you
have the Elasticsearch output configured, you can simply uncomment the
following line.
#xpack.monitoring.elasticsearch:
[root@xxxxxx ~]#
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