Environments

Environment	Description
VERTEX_WORKER_THREADS	How many threads the Tokio runtime will use
VERTEX_MAX_BLOCKING_THREADS	The limit for additional blocking threads spawned by the Runtime
VERTEX_LOG	Log level filter, see examples

Using environment in config

sources:
  http_check:
    type: http_check
    targets:
      - http://${HOSTNAME}:80

Some feature of Environment expansions is supported too.

${parameter:-word}

If parameter is unset or null, the word returned. Otherwise, the value of parameter is returned.

$ v=123
$ echo ${v-unset}
123
$ echo ${v:-unset-or-null}
123
$ unset v
$ echo ${v-unset}
unset
$ v=
$ echo ${v-unset}

$ echo ${v:-unset-or-null}
unset-or-null

${parameter:?word}

If parameter is unset or null, vertex throw an warning.

$ var=
$ : ${var:?var is unset or null}
bash: var: var is unset or null
$ echo ${var?var is unset}

$ unset var
$ : ${var?var is unset}
bash: var: var is unset
$ : ${var:?var is unset or null}
bash: var: var is unset or null
$ var=123
$ echo ${var:?var is unset or null}
123