Humio is configured by setting environment variables. The example configuration file below contains comments describing each individual option.

Docker Tip
When running Humio in Docker you can pass set the --env-file= flag and keep your configuration in a file. For a quick intro to setting configuration options see the documentation for installation on docker.

Example configuration

# The stacksize should be at least 2M.
# We suggest setting MaxDirectMemory to 50% of physical memory. At least 2G required.
HUMIO_JVM_ARGS=-XX:+UseParallelOldGC -Xss2M -XX:MaxDirectMemorySize=4G

# Make Humio write a backup of the data files:
# Backup files are written to mount point "/backup".

# ID to choose for this server when starting up the first time.
# Leave commented out to autoselect the next available ID.
# If set, the server refuses to run unless the ID matches the state in data.
# If set, must be a (small) positive integer.

# The URL that other humio hosts in the cluster can use to reach this server.
# Required for clustering. Examples:  or  http://humio01:8080
# Security: We recommend using a TLS endpoint.
# If all servers in the Humio cluster share a closed LAN, using those endpoints may be okay.

# The URL which users/browsers will use to reach the server
# This URL is used to create links to the server
# It is important to set this property when using OAuth authentication or alerts.

# Specify the replication factor for the Kafka ingest queue

# Kafka bootstrap servers list. Used as `bootstrap.servers` towards kafka.
# should be set to a comma separated host:port pairs string.
# Example: `my-kafka01:9092` or `kafkahost01:9092,kafkahost02:9092`

# Zookeeper servers.
# Defaults to "localhost:2181", which is okay for a single server system, but
# should be set to a comma separated host:port pairs string.
# Example: zoohost01:2181,zoohost02:2181,zoohost03:2181
# Note, there is NO security on the zookeeper connections. Keep inside trusted LAN.

# Maximum number of datasources (unique tag combinations) in a repo.
# There will be a sub-directory for each combination that exists.
# (Since v1.1.10)

# Let Humio send emails using the Postmark service
# Create a Postmark account and insert the token here

# Let Humio send emails using an SMTP server. ONLY put a password here
# if you also enable starttls. Otherwise you will expose your password.
# Example using GMail:
# Example using a local clear-text non-authenticated SMTP server

# Select the TCP port to listen for http.
# Select the TCP port for ElasticSearch Bulk API

# Select the IP to bind the udp/tcp/http listening sockets to.
# Each listener entity has a listen-configuration. This ENV is used when that is not set.

# Select the IP to bind the http listening socket to. (Defaults to HUMIO_SOCKET_BIND)

Java virtual machine parameters

You can specify Java virtual machine parameters to pass to Humio using the property HUMIO_JVM_ARGS. The defaults are:

HUMIO_JVM_ARGS=-XX:+UseParallelOldGC -Xss2M -XX:MaxDirectMemorySize=4G

Number of CPU Cores

You can specify the number of processors for the machine running Humio by setting the CORES property. Humio uses this number when parallelizing queries.

By default, Humio uses the Java available processors function to get the number of CPU cores. This is usually the optimal number.

Configuring Authentication

Humio supports different ways of authentication users. Read more in the dedicated Authentication Documentation.

Public URL

PUBLIC_URL is the URL where the Humio instance is reachable from a browser. Leave out trailing slashes.

This property is only important if you plan to use OAuth Federated Login, Auth0 Login or if you want to be able to have Alert Notifications have consistent links back to the Humio UI.

The URL might only be reachable behind a VPN but that is no problem, as the user’s browser can access it.