Limit Bandwidth to Container

Some containers need their bandwidth limited to reduce the risk of them flooding our limit upload speed. Examples of this are

• File storage / sharing

• Websites

• File conversion / editing software

Network Adaptor

Firstly, you will need to get primary network adaptors name, which (if different from mine - ens18) will need to be set as a variable.

1. SSH into your server

2. Run a command that lists network interfaces, such as ip link show

3. Review the output and locate your primary adaptor. You may have a stack of adaptors for your docker containers.

If your network adaptor is named differently than mine, you have 2 options

1. Set NETADAPT variable to the network interface name

2. Update ens18 in the section below to your network interface name

Compose File

To limit an application's bandwidth you will need to add the Traffic Control container and a network to your compose file. This container manages anything going through the docker network and applies the label limit

....

  traffic-control:
    image: lukaszlach/docker-tc:stable
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    networks:
      - network
    restart: on-failure
    cap_add:
      - NET_ADMIN
    command: [--interface, ${NETADAPT:-ens18}]
    
networks:
  network:

....

Applying label to application

In addition to the above, you will need to set the application to use the newly created network and add labels for its configuration,

....

services:
  app:
    image: my image
    networks:
      - network
    labels:
      com.docker-tc.enabled: "1"     # Enables Traffic Control mangement
      com.docker-tc.limit: "15mbps"  # Setting the bandwidth limit to 25mbit
      
....