`nlb` Map The nlb section contains parameters related to integrating your service with a Network Load Balancer. The Network Load Balancer is enabled only if you specify the `nlb` field. Note that for a Load-Balanced Web Service, at least one of Application Load Balancer and Network Load Balancer must be enabled. nlb.`port` String Required. The port and protocol for the Network Load Balancer to listen on. Accepted protocols include `tcp`, `udp` and `tls`. If the protocol is not specified, `tcp` is used by default. For example: ```yaml nlb: port: 80 ``` will listen on port 80 for `tcp` requests. This is the same as ```yaml nlb: port: 80/tcp ``` You can easily enable TLS termination. For example: ```yaml nlb: port: 443/tls ``` nlb.`healthcheck` Map Specify the health check configuration for your Network Load Balancer. ```yaml nlb: healthcheck: port: 80 healthy_threshold: 3 unhealthy_threshold: 2 interval: 15s timeout: 10s ``` nlb.healthcheck.`port` String The port that the health check requests are sent to. Specify this if your health check should be performed on a different port than the container target port. nlb.healthcheck.`healthy_threshold` Integer The number of consecutive health check successes required before considering an unhealthy target healthy. The default is 3. Range: 2-10. nlb.healthcheck.`unhealthy_threshold` Integer The number of consecutive health check failures required before considering a target unhealthy. The default is 3. Range: 2-10. nlb.healthcheck.`grace_period` Duration The amount of time to ignore failing target group healthchecks on container start. The default is 60s. This can be useful to fix deployment issues for containers which take a while to become healthy and begin listening for incoming connections, or to speed up deployment of containers guaranteed to start quickly. !!! info Per the [docs](https://docs.aws.amazon.com/elasticloadbalancing/latest/network/target-group-health-checks.html) at the time of this writing, 'unhealthy threshold' is required to be equal to 'healthy threshold' for a Network Load Balancer. nlb.healthcheck.`interval` Duration The approximate amount of time, in seconds, between health checks of an individual target. The value can be 10s or 30s. The default is 30s. nlb.healthcheck.`timeout` Duration The amount of time, in seconds, during which no response from a target means a failed health check. The default is 10s. nlb.`target_container` String A sidecar container that takes the place of a service container. nlb.`target_port` Integer The container port that receives traffic. Specify this field if the container port is different from `nlb.port`, the listener port. nlb.`ssl_policy` String The security policy that defines which protocols and ciphers are supported. To learn more, see [this doc](https://docs.aws.amazon.com/elasticloadbalancing/latest/network/create-tls-listener.html#describe-ssl-policies). nlb.`stickiness` Boolean Indicates whether sticky sessions are enabled. nlb.`alias` String or Array of Strings Domain aliases for your service. ```yaml # String version. nlb: alias: example.com # Alteratively, as an array of strings. nlb: alias: ["example.com", "v1.example.com"] ``` nlb.`additional_listeners` Array of Maps Configure multiple NLB listeners. {% include 'nlb-additionallisteners.en.md' %}