H2O is a new generation HTTP server that provides quicker response to users with less CPU utilization when compared to older generation of web servers.
It is notable for having much simpler configuration than many popular HTTP servers, low resource requirements, and integrated native support for many things that other HTTP servers may need special setup to use.
Sane configuration defaults mean that typical configurations are very minimalistic and easy to work with.
Native support for HTTP/2 provides improved performance when accessing the Netdata dashboard remotely.
Password protect access to the Netdata dashboard without requiring Netdata Cloud.
H2O configuration file.
On most systems, the H2O configuration is found under
/etc/h2o. H2O uses YAML 1.1, with a few special extensions, for it’s configuration files, with the main configuration file being
You can edit the H2O configuration file with Nano, Vim or any other text editors with which you are comfortable.
After making changes to the configuration files, perform the following:
Test the configuration with
h2o -m test -c /etc/h2o/h2o.conf
Restart H2O to apply tha changes with
service h2o restart
Ways to access Netdata via H2O
As a virtual host
With this method instead of
SERVER_IP_ADDRESS:19999, the Netdata dashboard can be accessed via a human-readable URL such as
netdata.example.com used in the configuration below.
As a subfolder of an existing virtual host
This method is recommended when Netdata is to be served from a subfolder (or directory).
In this case, the virtual host
netdata.example.com already exists and Netdata has to be accessed via
As a subfolder for multiple Netdata servers, via one H2O instance
This is the recommended configuration when one H2O instance will be used to manage multiple Netdata servers via subfolders.
Of course you can add as many backend servers as you like.
Using the above, you access Netdata on the backend servers, like this:
http://netdata.example.com/netdata/server1/to reach Netdata on
http://netdata.example.com/netdata/server2/to reach Netdata on
Encrypt the communication between H2O and Netdata
In case Netdata's web server has been configured to use TLS, it is
necessary to specify inside the H2O configuration that the final destination is using TLS. To do this, change the
http:// on the
proxy.reverse.url line in your H2O configuration with
Create an authentication file to enable basic authentication via H2O, this secures your Netdata dashboard.
If you don't have an authentication file, you can use the following command:
printf "yourusername:$(openssl passwd -apr1)" > /etc/h2o/passwords
And then add a basic authentication handler to each path definition:
For more information on using basic authentication with H2O, see their official documentation.
Limit direct access to Netdata
If your H2O server is on
localhost, you can use this to ensure external access is only possible through H2O:
bind to = 127.0.0.1 ::1
You can also use a unix domain socket. This will provide faster communication between H2O and Netdata as well:
bind to = unix:/run/netdata/netdata.sock
In the H2O configuration, use a line like the following to connect to Netdata via the unix socket:
If your H2O server is not on localhost, you can set:
bind to = *
allow connections from = IP_OF_H2O_SERVER
note: Netdata v1.9+ support
allow connections from
allow connections from accepts Netdata simple patterns to match against
the connection IP address.
Prevent the double access.log
H2O logs accesses and Netdata logs them too. You can prevent Netdata from generating its access log, by setting
access log = none