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# Configuration Guide
Configuration files are placed in `/etc/netdata`.
## Netdata Daemon
The daemon configuration file is read from `/etc/netdata/netdata.conf`.
In this file you can configure all aspects of netdata. Netdata provides configuration settings for plugins and charts found when started. You can find all these settings, with their default values, by accessing the URL `https://netdata.server.hostname:19999/netdata.conf`. For example check the configuration file of [netdata.firehol.org](http://netdata.firehol.org/netdata.conf).
The configuration file has sections stated with `[section]`. There will be the following sections:
1. `[global]` for global netdata daemon options
2. `[plugins]` for controlling which plugins the netdata will use
3. `[plugin:NAME]` one such section for each plugin enabled
4. `[CHART_NAME]` once such section for each chart defined
The configuration file is a `name = value` dictionary. Netdata will not complain if you set options unknown to it. When you check the running configuration by accessing the URL `/netdata.conf` on your netdata server, netdata will add a comment on settings it does not currently use.
### [global] section options
setting | default | info
:------:|:-------:|:----
hostname|auto-detected|The hostname of the computer running netdata.
history|3600|The number of entries the netdata daemon will by default keep in memory for each chart dimension. This setting can also be configured per chart. Check [Memory Requirements](../../database/#netdata-database) for more information.
config directory|`/etc/netdata`|The directory configuration files are kept.
plugins directory|`/usr/libexec/netdata/plugins.d`|The directory plugin programs are kept. This setting supports multiple directories, space separated. If any directory path contains spaces, enclose it in single or double quotes.
web files directory|`/usr/share/netdata/web`|The directory the web static files are kept.
cache directory|`/var/cache/netdata`|The directory the memory database will be stored if and when netdata exits. Netdata will re-read the database when it will start again, to continue from the same point.
log directory|`/var/log/netdata`|The directory in which the [log files](../#log-files) are kept.
host access prefix|*empty*|This is used in docker environments where /proc, /sys, etc have to be accessed via another path. You may also have to set SYS_PTRACE capability on the docker for this work. Check [issue 43](https://github.com/netdata/netdata/issues/43).
debug flags|0x00000000|Bitmap of debug options to enable. For more information check [Tracing Options](../#debugging).
memory deduplication (ksm)|yes|When set to `yes`, netdata will offer its in-memory round robin database to kernel same page merging (KSM) for deduplication. For more information check [[Memory Deduplication - Kernel Same Page Merging - KSM]]
debug log|`/var/log/netdata/debug.log`|The filename to save debug information. This file will not be created is debugging is not enabled. You can also set it to `syslog` to send the debug messages to syslog, or `none` to disable this log. For more information check [Tracing Options](../#debugging).
error log|`/var/log/netdata/error.log`|The filename to save error messages for netdata daemon and all plugins (`stderr` is sent here for all netdata programs, including the plugins). You can also set it to `syslog` to send the errors to syslog, or `none` to disable this log.
access log|`/var/log/netdata/access.log`|The filename to save the log of web clients accessing netdata charts. You can also set it to `syslog` to send the access log to syslog, or `none` to disable this log.
memory mode|save|When set to `save` netdata will save its round robin database on exit and load it on startup. When set to `map` the cache files will be updated in real time (check `man mmap` - do not set this on systems with heavy load or slow disks - the disks will continuously sync the in-memory database of netdata). When set to `ram` the round robin database will be temporary and it will be lost when netdata exits.
update every|1|The frequency in seconds, for data collection. For more information see [Performance](../../doc/Performance.md#netdata-performance).
run as user|`netdata`|The user netdata will run as.
web files owner|`netdata`|The user that owns the web static files. Netdata will refuse to serve a file that is not owned by this user, even if it has read access to that file. If the user given is not found, netdata will only serve files owned by user given in `run as user`.
http port listen backlog|100|The port backlog. Check `man 2 listen`.
default port|19999|The default port to listen for web clients.
bind to|`*`|The IP address and port to listen to. This is a space separated list of IPv4 or IPv6 address and ports. The default will bind to all IP addresses. Example: `bind to = 127.0.0.1:19999 10.11.12.1:19998 [::1]:19999`.
disconnect idle web clients after seconds|60|The time in seconds to disconnect web clients after being totally idle.
enable web responses gzip compression|yes|When set to `yes`, netdata web responses will be GZIP compressed, if the web client accepts such responses.
##### netdata process priority
By default, netdata runs with the `idle` process scheduler, which assigns CPU resources to netdata, only when the system has such resources to spare.
The following `netdata.conf` settings control this:
```
[global]
process scheduling policy = idle
process scheduling priority = 0
process nice level = 19
```
The policies supported by netdata are `idle` (the netdata default), `other` (also as `nice`), `batch`, `rr`, `fifo`. netdata also recognizes `keep` and `none` to keep the current settings without changing them.
For `other`, `nice` and `batch`, the setting `process nice level = 19` is activated to configure the nice level of netdata. Nice gets values -20 (highest) to 19 (lowest).
For `rr` and `fifo`, the setting `process scheduling priority = 0` is activated to configure the priority of the relative scheduling policy. Priority gets values 1 (lowest) to 99 (highest).
For the details of each scheduler, see `man sched_setscheduler` and `man sched`.
When netdata is running under systemd, it can only lower its priority (the default is `other` with `nice level = 0`). If you want to make netdata to get more CPU than that, you will need to set in `netdata.conf`:
```
[global]
process scheduling policy = keep
```
and edit `/etc/systemd/system/netdata.service` and add:
```
CPUSchedulingPolicy=other | batch | idle | fifo | rr
CPUSchedulingPriority=99
Nice=-10
```
### [plugins] section options
In this section there will be a boolean (`yes`/`no`) option for each plugin. Additionally, there will be the following options:
setting | default | info
:------:|:-------:|:----
checks|no|This is a debugging plugin for the internal latency of netdata.
enable running new plugins|yes|When set to `yes`, netdata will enable plugins not configured specifically for them. Setting this to `no` will disable all plugins you have not set to `yes` explicitly.
check for new plugins every|60|The time in seconds to check for new plugins in the plugins directory. This allows having other applications dynamically creating plugins for netdata.
## Netdata Plugins
The configuration options for plugins appear in sections following the pattern `[plugin:NAME]`.
### Internal Plugins
Most internal plugins will provide additional options. Check [Internal Plugins](../../collectors/) for more information.
### External Plugins
External plugins will have only 2 options at `netdata.conf`:
setting | default | info
:------:|:-------:|:----
update every|the value of `[global].update every` setting|The frequency in seconds the plugin should collect values. For more information check [Performance](../../doc/Performance.md#netdata-performance).
command options|*empty*|Additional command line options to pass to the plugin.
External plugins that need additional configuration may support a dedicated file in `/etc/netdata`. Check their documentation.
---
## A note about netdata.conf
This config file is not needed by default. You can just touch it (to be empty) to get rid of the error message displayed when missing.
The whole idea came up when I was evaluating the documentation involved in maintaining a complex configuration system. My intention was to give configuration options for everything imaginable. But then, documenting all these options would require a tremendous amount of time, users would have to search through endless pages for the option they need, etc.
I concluded then that configuring software like that is a waste for time and effort. Of course there must be plenty of configuration options, but the implementation itself should require a lot less effort for both the devs and the users.
So, I did this:
1. No configuration is required to run netdata
2. There are plenty of options to tweak
3. There is minimal documentation (or no at all)
### Why this works?
The configuration file is a `name = value` dictionary with `[sections]`. Write whatever you like there as long as it follows this simple format.
Netdata loads this dictionary and then when the code needs a value from it, it just looks up the `name` in the dictionary at the proper `section`. In all places, in the code, there are both the `names` and their `default values`, so if something is not found in the configuration file, the default is used. The lookup is made using B-Trees and hashes (no string comparisons), so they are super fast. Also the `names` of the settings can be `my super duper setting that once set to yes, will turn the world upside down = no` - so goodbye to most of the documentation involved.
Next, netdata can generate a valid configuration for the user to edit. No need to remember anything. Just get the configuration from the server (`/netdata.conf` on your netdata server), edit it and save it.
Last, what about options you believe you have set, but you misspelled? When you get the configuration file from the server, there will be a comment above all `name = value` pairs the server does not use. So you know that whatever you wrote there, is not used.
### limiting access to netdata.conf
netdata v1.9+ limit by default access to `http://your.netdata.ip:19999/netdata.conf` to private IP addresses. This is controlled by this settings:
```
[web]
allow netdata.conf from = localhost fd* 10.* 192.168.* 172.16.* 172.17.* 172.18.* 172.19.* 172.20.* 172.21.* 172.22.* 172.23.* 172.24.* 172.25.* 172.26.* 172.27.* 172.28.* 172.29.* 172.30.* 172.31.*
```
The IPs listed are all the private IPv4 addresses, including link local IPv6 addresses.
> Keep in mind that connections to netdata API ports are filtered by `[web].allow connections from`. So, IPs allowed by `[web].allow netdata.conf from` should also be allowed by `[web].allow connections from`.
## netdata simple patterns
Unix prefers regular expressions. But they are just too hard, too cryptic to use, write and understand.
So, netdata supports [simple patterns](../../libnetdata/simple_pattern/).
## Applying changes
After `netdata.conf` has been modified, netdata needs to be restarted for changes to apply:
```bash
sudo service netdata restart
```
If the above does not work, try the following:
```bash
sudo killall netdata; sleep 10; sudo netdata
```
Please note that your data history will be lost if you have modified `history` parameter in section `[global]`.
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