Aion Docs

Configuration File

Customize your Aion Java kernel configuration file.

Each network has a config.xml for the kernel, which controls the configuration settings each network can set. This file is read-only once when the kernel is started. Any updates made in the config.xml file while the kernel is running will not take effect until you stop the kernel (CTRL + C) and restart it (./


The Java kernel has seperate configuration files for each network. For example, the config.xml file for the Aion Mainnet network can be found in ~/aion/mainnet/config/config.xml.

The tree structure below shows the folder hierarchy. Some files and folders have been removed to make things clearer:

├── avmtestnet
│   ├── config
|   │   └── config.xml
├── mainnet
│   ├── config
|   │   └── config.xml
├── mastery
│   ├── config
|   │   └── config.xml

Frequent Use Cases

The following are some frequent use cases when the configurations should be modified.

Importing a Pre-Existing Configuration

When booting up (using ./, the kernel will search for a pre-existing config.xml file. If you are booting the kernel for the first time and no config.xml file is present, then one will be created.

If a config.xml file is found (in the corresponding network folder):

  1. The config/[network]/config.xml file is read.
  2. The kernel checks the network ID within config.xml and matches it to an available network:
    • 256 -> mainnet
    • 128 -> conquest
    • 32 -> mastery
    • any positive number not listed above -> custom
  3. config/[network]/config.xml and config/[network]/genesis.json are both deleted.
  4. /config/[network]/config.xml is overwritten with the read configuration.
  5. database, log, and keystore are all set with absolute paths based on the location read from the old config.

If you are going to use a different network for the next execution, you must supply the n [network] option.


To receive tokens for mining blocks, you first need to create an account using:

./ -a create

The mining section illustrates how to set this account to be able to receive tokens for mining.

To import accounts created using a different binary on the same network follow the guide on exporting and importing accounts.

Adding Known Peers

The default configuration from the release contains the seed nodes by default. Do not remove these nodes from the configuration. To include additional peers update the config.xml file by adding nodes using the permanent peer id, IP, and port of the computers you wish to connect to:

        <node>p2p://[email protected]:PORT</node>

Make sure to keep your configuration IP at to connect locally. To allow peers to connect to you, set it to

After running the kernel once, your configuration file will be updated with a permanent peer id. This id can be found at the top of the config.xml file.


If instead of a permanent id your configuration has an id placeholder, you only need to start the kernel to be assigned a permanent id. You can share this id with peers that want to add your node to their configuration file. During kernel run time your peer list will expand to include other active nodes.

If you accidentally delete the seed nodes from your configuration, you can find them on the seed nodes page. Make sure to add the seed nodes for the network you want to connect to.

Log System Settings

The log section in config.xml allows one to selectively set log-levels for each of the kernel modules. Available log-levels, from highest (most verbose) to lowest (least verbose), are:

  • INFO
  • WARN
  • OFF

These log levels maps directly to logback's log levels. OFF turns off all the logging for a particular module, and TRACE prints out all available logging information.

Note that the ROOT logger maps to the logback root logger, and captures all logs not emitted directly by any of the modules.

Absolute Paths

The logs now allow for absolute paths. Absolute paths refer to a very specific location on the your computer, and do not use aliases such as ~.

Rolling Persistent Logs

The kernel's logger is configured to persist all generated log data into the log folder by default. The logs roll-over every data at midnight, and every time a log file gets larger than 100MB.

To control the directory where the logs are stored to disk, you can change the <log-path> property to your directory of choice. To disable persistence to file entirely, set the <log-file> property to false.

    <!--Enable/Disable logback service; if disabled, output will not be logged -->
    <!--Sets the physical location on disk where log files will be stored.-->


Configuration File

Customize your Aion Java kernel configuration file.

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