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Network Management

New as of 0.11.0

network:report [<app>] [<flag>]          # Displays a network report for one or more apps
network:rebuild <app>                    # Rebuilds network settings for an app
network:rebuildall                       # Rebuild network settings for all apps
network:set <app> <key> (<value>)        # Set or clear a network property for an app

The Network plugin allows developers to abstract the concept of container network management, allowing developers to both change what networks a given container is attached to as well as rebuild the configuration on the fly.

Usage

Rebuilding network settings

There are cases where you may need to rebuild the network configuration for an app, such as on app boot or container restart. In these cases, you can use the network:rebuild command:

dokku network:rebuild node-js-app

This command will exit a non-zero number that depends on the number of containers for which configuration could not be built

Rebuilding all network settings

In some cases, a docker upgrade may reset container IPs or Ports. In both cases, you can quickly rewrite those files by using the network:rebuildall command:

dokku network:rebuildall

This command will exit a non-zero number that depends on the number of containers for which configuration could not be built

Container network interface binding

This functionality does not control the --network docker flag. Please use the docker-options plugin to manage this flag.

By default, an application will only bind to the internal interface. This behavior can be modified per app by changing the bind-all-interfaces network property.

# bind to the default docker interface (`docker0`) with a random internal ip
# this is the default behavior
dokku network:set node-js-app bind-all-interfaces false

# bind to all interfaces (`0.0.0.0`) on a random port for each upstream port
# this will make the app container directly accessible by other hosts on your network
# ports are randomized for every deploy, e.g. `0.0.0.0:32771->5000/tcp`.
dokku network:set node-js-app bind-all-interfaces true

By way of example, in the default case, each container is bound to the docker interface:

docker ps
CONTAINER ID        IMAGE                      COMMAND                CREATED              STATUS              PORTS               NAMES
1b88d8aec3d1        dokku/node-js-app:latest   "/bin/bash -c '/star   About a minute ago   Up About a minute                       node-js-app.web.1

As such, the container's IP address will be an internal IP, and thus it is only accessible on the host itself:

docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' node-js-app.web.1
172.17.0.6

However, you can disable the internal proxying via the network:set command so that it will listen on the host's IP address:

dokku network:set node-js-app bind-all-interfaces true

# container bound to all interfaces
docker ps
CONTAINER ID        IMAGE                      COMMAND                CREATED              STATUS              PORTS                     NAMES
d6499edb0edb        dokku/node-js-app:latest   "/bin/bash -c '/star   About a minute ago   Up About a minute   0.0.0.0:49153->5000/tcp   node-js-app.web.1

Displaying network reports about an app

You can get a report about the app's network status using the network:report command:

dokku network:report
=====> node-js-app network information
       Network bind all interfaces: false
       Network listeners: 172.17.0.1:5000
=====> python-sample network information
       Network bind all interfaces: false
       Network listeners: 172.17.0.2:5000
=====> ruby-sample network information
       Network bind all interfaces: true
       Network listeners:

You can run the command for a specific app also.

dokku network:report node-js-app
=====> node-js-app network information
       Network bind all interfaces: false
       Network listeners: 172.17.0.1:5000

You can pass flags which will output only the value of the specific information you want. For example:

dokku network:report node-js-app --network-bind-all-interfaces
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