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Configuration model

Unkey services read configuration from a TOML file passed at startup. Environment variables can be referenced with ${VAR} and are expanded before parsing. Defaults and validation run after parsing. The config schema maps to svc/frontline/config.go. Minimal config example: 
challenge_port = 7070
http_port = 7443
region = "${UNKEY_REGION}.aws"
instance_id = "${POD_NAME}"
apex_domain = "${UNKEY_APEX_DOMAIN}"
max_hops = 10
ctrl_addr = "${UNKEY_CTRL_ADDR}"
prometheus_port = 9090

[database]
primary = "${UNKEY_DATABASE_PRIMARY}"
readonly_replica = "${UNKEY_DATABASE_REPLICA}"

[vault]
url = "${UNKEY_VAULT_URL}"
token = "${UNKEY_VAULT_TOKEN}"

[gossip]
bind_addr = "0.0.0.0"
lan_port = 7946
wan_port = 7947
secret_key = "${UNKEY_GOSSIP_SECRET_KEY}"
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instance_id
string
Instance identifier for logs and tracing.
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challenge_port
int
default:"7070"
Port for ACME HTTP-01 challenges.
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http_port
int
default:"7443"
HTTPS listener port.
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region
string
required
Region label for routing.
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apex_domain
string
default:"unkey.cloud"
Apex domain for regional routing.
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max_hops
int
default:"10"
Maximum number of routing hops.
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ctrl_addr
string
default:"localhost:8080"
Control API address.
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prometheus_port
int
Prometheus metrics port. Set to 0 to disable.
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tls
object
TLS settings for HTTPS.
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database
object
MySQL configuration.
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vault
object
Vault connection.
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gossip
object
Gossip-based cache invalidation.
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observability
object
Tracing and logging configuration.

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Environment variables

The Helm chart provides these variables for the default config template:
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UNKEY_REGION
env
required
Region label.
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UNKEY_APEX_DOMAIN
env
Apex domain for routing.
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UNKEY_CTRL_ADDR
env
Control API address.
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UNKEY_VAULT_URL
env
Vault URL.
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UNKEY_VAULT_TOKEN
env
Vault token.
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UNKEY_DATABASE_PRIMARY
env
required
MySQL primary DSN.
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UNKEY_DATABASE_REPLICA
env
MySQL read replica DSN.
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UNKEY_GOSSIP_SECRET_KEY
env
required
Gossip secret key.

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Example configuration

challenge_port = 7070
http_port = 7443
region = "${UNKEY_REGION}.aws"
instance_id = "${POD_NAME}"
apex_domain = "${UNKEY_APEX_DOMAIN}"
max_hops = 10
ctrl_addr = "${UNKEY_CTRL_ADDR}"
prometheus_port = 9090

[database]
primary = "${UNKEY_DATABASE_PRIMARY}"
readonly_replica = "${UNKEY_DATABASE_REPLICA}"

[vault]
url = "${UNKEY_VAULT_URL}"
token = "${UNKEY_VAULT_TOKEN}"

[gossip]
bind_addr = "0.0.0.0"
lan_port = 7946
wan_port = 7947
secret_key = "${UNKEY_GOSSIP_SECRET_KEY}"

[observability.tracing]
sample_rate = 0.1

[observability.logging]
sample_rate = 0.01
slow_threshold = "2s"