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diff --git a/src/daemon/config/README.md b/src/daemon/config/README.md new file mode 100644 index 000000000..3a2cee05b --- /dev/null +++ b/src/daemon/config/README.md @@ -0,0 +1,231 @@ +<!-- +title: "Daemon configuration" +description: "The Netdata Agent's daemon is installed preconfigured to collect thousands of metrics every second, but is highly configurable for real-world workloads." +custom_edit_url: "https://github.com/netdata/netdata/edit/master/src/daemon/config/README.md" +sidebar_label: "Daemon" +learn_status: "Published" +learn_rel_path: "Configuration" +learn_doc_purpose: "Explain the daemon options, the log files, the process scheduling, virtual memory, explain how the netdata.conf is used and backlink to the netdata.conf file reference" +--> + +# Daemon configuration + +<details> +<summary>The daemon configuration file is read from /etc/netdata/netdata.conf.</summary> + +Depending on your installation method, Netdata will have been installed either directly under `/`, or +under `/opt/netdata`. The paths mentioned here and in the documentation in general assume that your installation is +under `/`. If it is not, you will find the exact same paths under `/opt/netdata` as well. (i.e. `/etc/netdata` will +be `/opt/netdata/etc/netdata`). + +</details> + +This config file **is not needed by default**. Netdata works fine out of the box without it. But it does allow you to +adapt the general behavior of Netdata, in great detail. 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). HTTP access to this file is limited by default to +[private IPs](https://en.wikipedia.org/wiki/Private_network), via +the [web server access lists](https://github.com/netdata/netdata/blob/master/src/web/server/README.md#access-lists). + +`netdata.conf` has sections stated with `[section]`. You will see the following sections: + +1. `[global]` to [configure](#global-section-options) the [Netdata daemon](https://github.com/netdata/netdata/blob/master/src/daemon/README.md). +2. `[db]` to [configure](#db-section-options) the database of Netdata. +3. `[directories]` to [configure](#directories-section-options) the directories used by Netdata. +4. `[logs]` to [configure](#logs-section-options) the Netdata logging. +5. `[environment variables]` to [configure](#environment-variables-section-options) the environment variables used + Netdata. +6. `[sqlite]` to [configure](#sqlite-section-options) the [Netdata daemon](https://github.com/netdata/netdata/blob/master/src/daemon/README.md) SQLite settings. +7. `[ml]` to configure settings for [machine learning](https://github.com/netdata/netdata/blob/master/src/ml/README.md). +8. `[health]` to [configure](#health-section-options) general settings for [health monitoring](https://github.com/netdata/netdata/blob/master/src/health/README.md). +9. `[web]` to [configure the web server](https://github.com/netdata/netdata/blob/master/src/web/server/README.md). +10. `[registry]` for the [Netdata registry](https://github.com/netdata/netdata/blob/master/src/registry/README.md). +11. `[global statistics]` for the [Netdata registry](https://github.com/netdata/netdata/blob/master/src/registry/README.md). +12. `[statsd]` for the general settings of the [stats.d.plugin](https://github.com/netdata/netdata/blob/master/src/collectors/statsd.plugin/README.md). +13. `[plugins]` to [configure](#plugins-section-options) which [collectors](https://github.com/netdata/netdata/blob/master/src/collectors/README.md) to use and PATH + settings. +14. `[plugin:NAME]` sections for each collector plugin, under the + comment [Per plugin configuration](#per-plugin-configuration). + +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. + +## Applying changes + +After `netdata.conf` has been modified, Netdata needs to be [restarted](https://github.com/netdata/netdata/blob/master/packaging/installer/README.md#maintaining-a-netdata-agent-installation) for +changes to apply: + +```bash +sudo systemctl restart netdata +``` + +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]`. + +## Sections + +### [global] section options + +| setting | default | info | +|:----------------------------------:|:-------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| process scheduling policy | `keep` | See [Netdata process scheduling policy](https://github.com/netdata/netdata/blob/master/src/daemon/README.md#netdata-process-scheduling-policy) | +| OOM score | `0` | | +| glibc malloc arena max for plugins | `1` | See [Virtual memory](https://github.com/netdata/netdata/blob/master/src/daemon/README.md#virtual-memory). | +| glibc malloc arena max for Netdata | `1` | See [Virtual memory](https://github.com/netdata/netdata/blob/master/src/daemon/README.md#virtual-memory). | +| hostname | auto-detected | The hostname of the computer running Netdata. | +| 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). | +| timezone | auto-detected | The timezone retrieved from the environment variable | +| run as user | `netdata` | The user Netdata will run as. | +| pthread stack size | auto-detected | | + +### [db] section options + +| setting | default | info | +|:---------------------------------------------:|:----------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| mode | `dbengine` | `dbengine`: The default for long-term metrics storage with efficient RAM and disk usage. Can be extended with `dbengine page cache size MB` and `dbengine disk space MB`. <br />`ram`: The round-robin database will be temporary and it will be lost when Netdata exits. <br />`alloc`: Similar to `ram`, but can significantly reduce memory usage, when combined with a low retention and does not support KSM. <br />`none`: Disables the database at this host, and disables health monitoring entirely, as that requires a database of metrics. Not to be used together with streaming. | +| retention | `3600` | Used with `mode = ram/alloc`, not the default `mode = dbengine`. This number reflects the number of entries the `netdata` daemon will by default keep in memory for each chart dimension. Check [Memory Requirements](https://github.com/netdata/netdata/blob/master/src/database/README.md) for more information. | +| storage tiers | `3` | The number of storage tiers you want to have in your dbengine. Check the tiering mechanism in the [dbengine's reference](https://github.com/netdata/netdata/blob/master/src/database/engine/README.md#tiering). You can have up to 5 tiers of data (including the _Tier 0_). This number ranges between 1 and 5. | +| dbengine page cache size MB | `32` | Determines the amount of RAM in MiB that is dedicated to caching for _Tier 0_ Netdata metric values. | +| dbengine tier **`N`** page cache size MB | `32` | Determines the amount of RAM in MiB that is dedicated for caching Netdata metric values of the **`N`** tier. <br /> `N belongs to [1..4]` | +| dbengine disk space MB | `256` | Determines the amount of disk space in MiB that is dedicated to storing _Tier 0_ Netdata metric values and all related metadata describing them. This option is available **only for legacy configuration** (`Agent v1.23.2 and prior`). | +| dbengine multihost disk space MB | `256` | Same functionality as `dbengine disk space MB`, but includes support for storing metrics streamed to a parent node by its children. Can be used in single-node environments as well. This setting is only for _Tier 0_ metrics. | +| dbengine tier **`N`** multihost disk space MB | `256` | Same functionality as `dbengine multihost disk space MB`, but stores metrics of the **`N`** tier (both parent node and its children). Can be used in single-node environments as well. <br /> `N belongs to [1..4]` | +| update every | `1` | The frequency in seconds, for data collection. For more information see the [performance guide](https://github.com/netdata/netdata/blob/master/docs/guides/configure/performance.md). These metrics stored as _Tier 0_ data. Explore the tiering mechanism in the [dbengine's reference](https://github.com/netdata/netdata/blob/master/src/database/engine/README.md#tiering). | +| dbengine tier **`N`** update every iterations | `60` | The down sampling value of each tier from the previous one. For each Tier, the greater by one Tier has N (equal to 60 by default) less data points of any metric it collects. This setting can take values from `2` up to `255`. <br /> `N belongs to [1..4]` | +| dbengine tier **`N`** back fill | `New` | Specifies the strategy of recreating missing data on each Tier from the exact lower Tier. <br /> `New`: Sees the latest point on each Tier and save new points to it only if the exact lower Tier has available points for it's observation window (`dbengine tier N update every iterations` window). <br /> `none`: No back filling is applied. <br /> `N belongs to [1..4]` | +| memory deduplication (ksm) | `yes` | When set to `yes`, Netdata will offer its in-memory round robin database and the dbengine page cache to kernel same page merging (KSM) for deduplication. For more information check [Memory Deduplication - Kernel Same Page Merging - KSM](https://github.com/netdata/netdata/blob/master/src/database/README.md#ksm) | +| cleanup obsolete charts after secs | `3600` | See [monitoring ephemeral containers](https://github.com/netdata/netdata/blob/master/src/collectors/cgroups.plugin/README.md#monitoring-ephemeral-containers), also sets the timeout for cleaning up obsolete dimensions | +| gap when lost iterations above | `1` | | +| cleanup orphan hosts after secs | `3600` | How long to wait until automatically removing from the DB a remote Netdata host (child) that is no longer sending data. | +| enable zero metrics | `no` | Set to `yes` to show charts when all their metrics are zero. | + +> ### Info +> +>The multiplication of all the **enabled** tiers `dbengine tier N update every iterations` values must be less than `65535`. + +### [directories] section options + +| setting | default | info | +|:-------------------:|:------------------------------------------------------------------:|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| config | `/etc/netdata` | The directory configuration files are kept. | +| stock config | `/usr/lib/netdata/conf.d` | | +| log | `/var/log/netdata` | The directory in which the [log files](https://github.com/netdata/netdata/blob/master/src/daemon/README.md#log-files) are kept. | +| web | `/usr/share/netdata/web` | The directory the web static files are kept. | +| cache | `/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. | +| lib | `/var/lib/netdata` | Contains the alert log and the Netdata instance GUID. | +| home | `/var/cache/netdata` | Contains the db files for the collected metrics. | +| lock | `/var/lib/netdata/lock` | Contains the data collectors lock files. | +| plugins | `"/usr/libexec/netdata/plugins.d" "/etc/netdata/custom-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. | +| health config | `/etc/netdata/health.d` | The directory containing the user alert configuration files, to override the stock configurations | +| stock health config | `/usr/lib/netdata/conf.d/health.d` | Contains the stock alert configuration files for each collector | +| registry | `/opt/netdata/var/lib/netdata/registry` | Contains the [registry](https://github.com/netdata/netdata/blob/master/src/registry/README.md) database and GUID that uniquely identifies each Netdata Agent | + +### [logs] section options + +| setting | default | info | +|:----------------------------------:|:-----------------------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| debug flags | `0x0000000000000000` | Bitmap of debug options to enable. For more information check [Tracing Options](https://github.com/netdata/netdata/blob/master/src/daemon/README.md#debugging). | +| debug | `/var/log/netdata/debug.log` | The filename to save debug information. This file will not be created if 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](https://github.com/netdata/netdata/blob/master/src/daemon/README.md#debugging). | +| error | `/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 | `/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. | +| facility | `daemon` | A facility keyword is used to specify the type of system that is logging the message. | +| errors flood protection period | `1200` | Length of period (in sec) during which the number of errors should not exceed the `errors to trigger flood protection`. | +| errors to trigger flood protection | `200` | Number of errors written to the log in `errors flood protection period` sec before flood protection is activated. | +| severity level | `info` | Controls which log messages are logged, with error being the most important. Supported values: `info` and `error`. | + +### [environment variables] section options + +| setting | default | info | +|:----------:|:-----------------:|:-----------------------------------------------------------| +| TZ | `:/etc/localtime` | Where to find the timezone | +| PATH | `auto-detected` | Specifies the directories to be searched to find a command | +| PYTHONPATH | | Used to set a custom python path | + +### [sqlite] section options + +| setting | default | info | +|:------------------:|:-------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| auto vacuum | `INCREMENTAL` | The [auto-vacuum status](https://www.sqlite.org/pragma.html#pragma_auto_vacuum) in the database | +| synchronous | `NORMAL` | The setting of the ["synchronous"](https://www.sqlite.org/pragma.html#pragma_synchronous) flag | +| journal mode | `WAL` | The [journal mode](https://www.sqlite.org/pragma.html#pragma_journal_mode) for databases | +| temp store | `MEMORY` | Used to determine where [temporary tables and indices are stored](https://www.sqlite.org/pragma.html#pragma_temp_store) | +| journal size limit | `16777216` | Used to set a new [limit in bytes for the database](https://www.sqlite.org/pragma.html#pragma_journal_size_limit) | +| cache size | `-2000` | Used to [suggest the maximum number of database disk pages](https://www.sqlite.org/pragma.html#pragma_cache_size) that SQLite will hold in memory at once per open database file | + +### [health] section options + +This section controls the general behavior of the health monitoring capabilities of Netdata. + +Specific alerts are configured in per-collector config files under the `health.d` directory. For more info, see [health +monitoring](https://github.com/netdata/netdata/blob/master/src/health/README.md). + +[Alert notifications](https://github.com/netdata/netdata/blob/master/src/health/notifications/README.md) are configured in `health_alarm_notify.conf`. + +| setting | default | info | +|:----------------------------------------------:|:------------------------------------------------:|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| enabled | `yes` | Set to `no` to disable all alerts and notifications | +| in memory max health log entries | 1000 | Size of the alert history held in RAM | +| script to execute on alarm | `/usr/libexec/netdata/plugins.d/alarm-notify.sh` | The script that sends alert notifications. Note that in versions before 1.16, the plugins.d directory may be installed in a different location in certain OSs (e.g. under `/usr/lib/netdata`). | +| run at least every seconds | `10` | Controls how often all alert conditions should be evaluated. | +| postpone alarms during hibernation for seconds | `60` | Prevents false alerts. May need to be increased if you get alerts during hibernation. | +| health log history | `432000` | Specifies the history of alert events (in seconds) kept in the agent's sqlite database. | +| enabled alarms | * | Defines which alerts to load from both user and stock directories. This is a [simple pattern](https://github.com/netdata/netdata/blob/master/src/libnetdata/simple_pattern/README.md) list of alert or template names. Can be used to disable specific alerts. For example, `enabled alarms = !oom_kill *` will load all alerts except `oom_kill`. | + +### [web] section options + +Refer to the [web server documentation](https://github.com/netdata/netdata/blob/master/src/web/server/README.md) + +### [plugins] section options + +In this section you will see be a boolean (`yes`/`no`) option for each plugin (e.g. tc, cgroups, apps, proc etc.). Note +that the configuration options in this section for the orchestrator plugins `python.d` and `charts.d` control **all the +modules** written for that orchestrator. For instance, setting `python.d = no` means that all Python modules +under `collectors/python.d.plugin` will be disabled. + +Additionally, there will be the following options: + +| setting | default | info | +|:-------------------------------:|:---------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| enable running new plugins | `yes` | When set to `yes`, Netdata will enable detected plugins, even if they are not configured explicitly. Setting this to `no` will only enable plugins explicitly configured in this file with a `yes` | +| 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. | +| checks | `no` | This is a debugging plugin for the internal latency | + +### [registry] section options + +To understand what this section is and how it should be configured, please refer to +the [registry documentation](https://github.com/netdata/netdata/blob/master/src/registry/README.md). + +## Per-plugin configuration + +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](https://github.com/netdata/netdata/blob/master/src/collectors/README.md) for more +information. + +Please note, that by default Netdata will enable monitoring metrics for disks, memory, and network only when they are +not zero. If they are constantly zero they are ignored. Metrics that will start having values, after Netdata is started, +will be detected and charts will be automatically added to the dashboard (a refresh of the dashboard is needed for them +to appear though). Use `yes` instead of `auto` in plugin configuration sections to enable these charts permanently. You +can also set the `enable zero metrics` option to `yes` in the `[global]` section which enables charts with zero metrics +for all internal Netdata plugins. + +### 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 the [performance guide](https://github.com/netdata/netdata/blob/master/docs/guides/configure/performance.md). | +| command options | - | 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. + |