Configuring controllers

A Juju controller is the management node of a Juju cloud environment. It houses the database and keeps track of all the models in that environment.

Controller configuration consists of a collection of keys and their respective values. An explanation of how to both view and set these key:value pairs is provided below.

Getting values

A controller's configuration key values can be listed by running this command:

juju controller-config

The key-value pairs that are shown will include those that were set during controller creation (see below), inherited as a default value (see table), or dynamically set by Juju.

Setting values

To set a key's value use the --config option during the controller creation process (see Creating a controller). For example, to create and configure a cloud named 'lxd':

juju bootstrap --config bootstrap-timeout=700 lxd

Once a controller is created, all its settings become immutable.

Note: The --config option may also be used to configure the 'default' model. In addition, the model-default option can usually always be used in place of the --config option. See [Configuring models][models-config] for more information on how models get configured and how these two options differ.

List of controller keys

This table lists all the controller keys which may be assigned a value.

Key Type Default Valid values Purpose
api-port integer 17070 The port to use for connecting to the API
autocert-dns-name string Sets the DNS name of the controller. If a client connects to this name, an official certificate will be automatically requested. Connecting to any other host name will use the usual self-generated certificate.
autocert-url string Sets the URL used to obtain official TLS certificates when a client connects to the API. By default, certificates are obtained from LetsEncrypt. A good value for testing is "".
allow-model-access bool false/true Sets whether the controller will allow users to connect to models they have been authorized for even when they don't have any access rights to the controller itself.
bootstrap-timeout integer 600 How long in seconds to wait for a connection to the controller
bootstrap-retry-delay integer 5 How long in seconds to wait between connection attempts to a controller
bootstrap-address-delay integer 10 How often in seconds to refresh controller addresses from the API server
ca-cert string The certificate of the CA that signed the controller's CA certificate, in PEM format
controller-uuid string The key for the UUID of the controller
identity-public-key string Sets the public key of the identity manager. Feature not yet implemented.
identity-url string Sets the URL of the identity manager. Feature not yet implemented.
max-logs-age string 72h 72h, etc. Sets the maximum age for log entries before they are pruned, in human-readable time format
max-logs-size string 4G 400M, 5G, etc. Sets the maximum size for the log collection, in human-readable memory format
max-txn-log-size string 10M 100M, 1G, etc. Sets the maximum size for the capped txn log collection, in human-readable memory format
mongo-memory-profile string low low/default Sets whether MongoDB uses the least possible memory or the default MongoDB memory profile
network string An OpenStack network UUID.
set-numa-control-policy bool false false/true Sets whether numactl is preferred for running processes with a specific NUMA (Non-Uniform Memory Architecture) scheduling or memory placement policy for multiprocessor systems where memory is divided into multiple memory nodes
state-port integer 37017 The port to use for mongo connections
use-floating-ip bool false Use with OpenStack. Sets whether a floating IP address is required in order for nodes to be assigned a public IP address.

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