host
Parameters
The port number on the container instance to reserve for your container. If you specify a `containerPortRange`, leave this field empty and the value of the `hostPort` is set as follows:
For containers in a task with the
`awsvpc`network mode, the`hostPort`is set to the same value as the`containerPort`. This is a static mapping strategy.For containers in a task with the
`bridge`network mode, the Amazon ECS agent finds open ports on the host and automatically binds them to the container ports. This is a dynamic mapping strategy. If you use containers in a task with the`awsvpc`or`host`network mode, the`hostPort`can either be left blank or set to the same value as the`containerPort`. If you use containers in a task with the`bridge`network mode, you can specify a non-reserved host port for your container port mapping, or you can omit the`hostPort`(or set it to`0`) while specifying a`containerPort`and your container automatically receives a port in the ephemeral port range for your container instance operating system and Docker version. The default ephemeral port range for Docker version 1.6.0 and later is listed on the instance under`/proc/sys/net/ipv4/ip_local_port_range`. If this kernel parameter is unavailable, the default ephemeral port range from 49153 through 65535 (Linux) or 49152 through 65535 (Windows) is used. Do not attempt to specify a host port in the ephemeral port range as these are reserved for automatic assignment. In general, ports below 32768 are outside of the ephemeral port range. The default reserved ports are 22 for SSH, the Docker ports 2375 and 2376, and the Amazon ECS container agent ports 51678-51680. Any host port that was previously specified in a running task is also reserved while the task is running. That is, after a task stops, the host port is released. The current reserved ports are displayed in the`remainingResources`of DescribeContainerInstances output. A container instance can have up to 100 reserved ports at a time. This number includes the default reserved ports. Automatically assigned ports aren't included in the 100 reserved ports quota.