- Heartbeat Reference: other versions:
- Overview
- Getting Started With Heartbeat
- Setting up and running Heartbeat
- Configuring Heartbeat
- Set up monitors
- Specify general settings
- Specify Observer and Geo Options
- Configure the internal queue
- Configure the output
- Configure index lifecycle management
- Specify SSL settings
- Filter and Enhance the exported data
- Define processors
- Add cloud metadata
- Add fields
- Add labels
- Add the local time zone
- Add tags
- Decode JSON fields
- Community ID Network Flow Hash
- Convert
- Drop events
- Drop fields from events
- Keep fields from events
- Rename fields from events
- Add Kubernetes metadata
- Add Docker metadata
- Add Host metadata
- Add Observer metadata
- Dissect strings
- DNS Reverse Lookup
- Add process metadata
- Extract array
- Parse data by using ingest node
- Enrich events with geoIP information
- Configure project paths
- Configure the Kibana endpoint
- Load the Elasticsearch index template
- Configure logging
- Use environment variables in the configuration
- Autodiscover
- YAML tips and gotchas
- Regular expression support
- HTTP Endpoint
- heartbeat.reference.yml
- Exported fields
- Beat fields
- Cloud provider metadata fields
- Common heartbeat monitor fields
- Docker fields
- ECS fields
- Host fields
- HTTP monitor fields
- ICMP fields
- Jolokia Discovery autodiscover provider fields
- Kubernetes fields
- Process fields
- Host lookup fields
- SOCKS5 proxy fields
- Monitor summary fields
- TCP layer fields
- TLS encryption layer fields
- Monitoring Heartbeat
- Securing Heartbeat
- Troubleshooting
- Contributing to Beats
Use environment variables in the configuration
editUse environment variables in the configuration
editYou can use environment variable references in the config file to set values that need to be configurable during deployment. To do this, use:
${VAR}
Where VAR
is the name of the environment variable.
Each variable reference is replaced at startup by the value of the environment variable. The replacement is case-sensitive and occurs before the YAML file is parsed. References to undefined variables are replaced by empty strings unless you specify a default value or custom error text.
To specify a default value, use:
${VAR:default_value}
Where default_value
is the value to use if the environment variable is
undefined.
To specify custom error text, use:
${VAR:?error_text}
Where error_text
is custom text that will be prepended to the error
message if the environment variable cannot be expanded.
If you need to use a literal ${
in your configuration file then you can write
$${
to escape the expansion.
After changing the value of an environment variable, you need to restart Heartbeat to pick up the new value.
You can also specify environment variables when you override a config
setting from the command line by using the -E
option. For example:
-E name=${NAME}
Examples
editHere are some examples of configurations that use environment variables and what each configuration looks like after replacement:
Config source | Environment setting | Config after replacement |
---|---|---|
|
|
|
|
no setting |
|
|
no setting |
|
|
|
|
|
no setting |
None. Returns an error message that’s prepended with the custom text. |
|
|
|
Specify complex objects in environment variables
editYou can specify complex objects, such as lists or dictionaries, in environment variables by using a JSON-like syntax.
As with JSON, dictionaries and lists are constructed using {}
and []
. But
unlike JSON, the syntax allows for trailing commas and slightly different string
quotation rules. Strings can be unquoted, single-quoted, or double-quoted, as a
convenience for simple settings and to make it easier for you to mix quotation
usage in the shell. Arrays at the top-level do not require brackets ([]
).
For example, the following environment variable is set to a list:
ES_HOSTS="10.45.3.2:9220,10.45.3.1:9230"
You can reference this variable in the config file:
output.elasticsearch: hosts: '${ES_HOSTS}'
When Heartbeat loads the config file, it resolves the environment variable and
replaces it with the specified list before reading the hosts
setting.
Do not use double-quotes ("
) to wrap regular expressions, or the backslash (\
) will be interpreted as an escape character.