The options shown below also contain the default values.

If you would like to alter any of these then please add your config option to `config.php`.

### Directories

```php
$config['install_dir'] = "/opt/librenms";
```
Set the installation directory (defaults to /opt/librenms), if you clone the github branch to another location ensure you alter this.

```php
$config['temp_dir'] = "/tmp";
```
The temporary directory is where images and other temporary files are created on your filesystem.

```php
$config['log_dir'] = "/opt/librenms/logs";
```
Log files created by LibreNMS will be stored within this directory.


#### Progams

A lot of these are self explanatory so no further information may be provided.

```php
$config['rrdtool'] = "/usr/bin/rrdtool";
```

```php
$config['fping']            = "/usr/bin/fping";
$config['fping6']           = "/usr/bin/fping6";
$config['fping_options']['retries'] = 3;
$config['fping_options']['timeout'] = 500;
```
fping configuration options, this includes setting the timeout and retry options.

```php
$config['snmpwalk']         = "/usr/bin/snmpwalk";
$config['snmpget']          = "/usr/bin/snmpget";
$config['snmpbulkwalk']     = "/usr/bin/snmpbulkwalk";
```
SNMP program locations.

```php
$config['whois']            = "/usr/bin/whois";
$config['ping']             = "/bin/ping";
$config['mtr']              = "/usr/bin/mtr";
$config['nmap']             = "/usr/bin/nmap";
$config['nagios_plugins']   = "/usr/lib/nagios/plugins";
$config['ipmitool']         = "/usr/bin/ipmitool";
$config['virsh']            = "/usr/bin/virsh";
$config['dot']              = "/usr/bin/dot";
$config['unflatten']        = "/usr/bin/unflatten";
$config['neato']            = "/usr/bin/neato";
$config['sfdp']             = "/usr/bin/sfdp";
```

#### Memcached

```php
$config['memcached']['enable']  = FALSE;
$config['memcached']['host']    = "localhost";
$config['memcached']['port']    = 11211;
```
Settings to enable memcached - currently it's not recommended to run memcached until support is improved.

#### RRDCached

```php
$config['rrdcached']    = "unix:/var/run/rrdcached.sock"; // or a tcp connection 127.0.0.1:42217
$config['rrdcached_dir'] = FALSE;
```
To enable rrdcached you need to set at least the `rrdcached` option. If `rrdcached` is a tcp socket then you need to configure `rrdcached_dir` as well.
This should be set based on your base directory for running rrdcached. For instance if -b for rrdcached is set to /var/lib/rrd but you are expecting 
LibreNMS to store them in /var/lib/rrd/librenms then you would need to set `rrdcached_dir` to librenms.

#### WebUI Settings

```php
$config['base_url'] = "http://demo.librenms.org";
```
LibreNMS will attempt to detect the URL you are using but you can override that here.

```php
$config['site_style']       = "light";
```
Currently we have a number of styles which can be set which will alter the navigation bar look. dark, light and mono with light being the default.

```php
$config['stylesheet']       = "css/styles.css";
```
You can override a large number of visual elements by creating your own css stylesheet and referencing it here.

```php
$config['page_refresh']     = "300";
```
Set how often pages are refreshed in seconds. The default is every 5 minutes. Some pages don't refresh at all by design.

```php
$config['front_page']       = "pages/front/default.php";
$config['front_page_settings']['top']['ports'] = 10;
$config['front_page_settings']['top']['devices'] = 10;
$config['front_page_down_box_limit'] = 10;
$config['vertical_summary'] = 0; // Enable to use vertical summary on front page instead of horizontal
$config['top_ports']        = 1; // This enables the top X ports box
$config['top_devices']      = 1; // This enables the top X devices box
```
A number of home pages are provided within the install and can be found in html/pages/front/. You can change the default by 
setting `front_page`. The other options are used to alter the look of those pages that support it (default.php supports these options).

```php
$config['login_message']    = "Unauthorised access or use shall render the user liable to criminal and/or civil prosecution.";
```
This is the default message on the login page displayed to users.

```php
$config['public_status']    = false;
```
If this is set to true then an overview will be shown on the login page of devices and the status.

```php
$config['show_locations']          = 1;  # Enable Locations on menu
$config['show_locations_dropdown'] = 1;  # Enable Locations dropdown on menu
$config['show_services']           = 0;  # Enable Services on menu
$config['int_customers']           = 1;  # Enable Customer Port Parsing
$config['customers_descr']         = 'cust'; // The description to look for in ifDescr. Can be an array as well array('cust','cid');
$config['transit_descr']           = ""; // Add custom transit descriptions (can be an array)
$config['peering_descr']           = ""; // Add custom peering descriptions (can be an array)
$config['core_descr']              = ""; // Add custom core descriptions (can be an array)
$config['custom_descr']            = ""; // Add custom interface descriptions (can be an array)
$config['int_transit']             = 1;  # Enable Transit Types
$config['int_peering']             = 1;  # Enable Peering Types
$config['int_core']                = 1;  # Enable Core Port Types
$config['int_l2tp']                = 0;  # Enable L2TP Port Types
```
Enable / disable certain menus from being shown in the WebUI.

```php
$config['web_mouseover']      = TRUE;
```
You can disable the mouseover popover for mini graphs by setting this to FALSE.

```php
$config['show_overview_tab'] = TRUE;
```
Enable or disable the overview tabe for a device.

```php
$config['overview_show_sysDescr'] = TRUE;
```
Enable or disable the sysDescr output for a device.

```php
$config['device_traffic_iftype'][] = '/loopback/';
```
Interface types that aren't graphed in the WebUI. The default array contains more items, please see includes/defaults.inc.php for the full list.

```php
$config['enable_clear_discovery'] = 1;
```
Administrators are able to clear the last discovered time of a device which will force a full discovery run within the configured 5 minute cron window.

```php
$config['enable_footer'] = 1;
```
Disable the footer of the WebUI by setting `enable_footer` to 0.

#### SNMP Settings

```php
$config['snmp']['timeout'] = 1;            # timeout in seconds
$config['snmp']['retries'] = 5;            # how many times to retry the query
$config['snmp']['transports'] = array('udp', 'udp6', 'tcp', 'tcp6');
$config['snmp']['version'] = "v2c";         # Default version to use
$config['snmp']['port'] = 161;
```
Default SNMP options including retry and timeout settings and also default version and port.

```php
$config['snmp']['community'][0] = "public";
```
The default v1/v2c snmp community to use, you can expand this array with `[1]`, `[2]`, `[3]`, etc.

```php
$config['snmp']['v3'][0]['authlevel'] = "noAuthNoPriv";  # noAuthNoPriv | authNoPriv | authPriv
$config['snmp']['v3'][0]['authname'] = "root";           # User Name (required even for noAuthNoPriv)
$config['snmp']['v3'][0]['authpass'] = "";               # Auth Passphrase
$config['snmp']['v3'][0]['authalgo'] = "MD5";            # MD5 | SHA
$config['snmp']['v3'][0]['cryptopass'] = "";             # Privacy (Encryption) Passphrase
$config['snmp']['v3'][0]['cryptoalgo'] = "AES";          # AES | DES
```
The default v3 snmp details to use, you can expand this array with `[1]`, `[2]`, `[3]`, etc.

#### Auto discovery settings

```php
$config['autodiscovery']['xdp']            = TRUE;
$config['autodiscovery']['ospf']           = TRUE;
$config['autodiscovery']['bgp']            = TRUE;
$config['autodiscovery']['snmpscan']       = TRUE;
$config['discover_services']               = FALSE;
```
Auto discovery options, xdp covers LLDP, CDP and FDP. `discover_services` will discover services from SNMP.

```php
$config['autodiscovery']['nets-exclude'][] = "0.0.0.0/8";
$config['autodiscovery']['nets-exclude'][] = "127.0.0.0/8";
$config['autodiscovery']['nets-exclude'][] = "169.254.0.0/16";
$config['autodiscovery']['nets-exclude'][] = "224.0.0.0/4";
$config['autodiscovery']['nets-exclude'][] = "240.0.0.0/4";
```
Arrays of subnets to exclude in auto discovery mode.

#### Email configuration

> You can configure these options within the WebUI now, please avoid setting these options within config.php

```php
$config['email_backend']              = 'mail';
$config['email_from']                 = NULL;
$config['email_user']                 = $config['project_id'];
$config['email_sendmail_path']        = '/usr/sbin/sendmail';
$config['email_smtp_host']            = 'localhost';
$config['email_smtp_port']            = 25;
$config['email_smtp_timeout']         = 10;
$config['email_smtp_secure']          = NULL;
$config['email_smtp_auth']            = FALSE;
$config['email_smtp_username']        = NULL;
$config['email_smtp_password']        = NULL;
```
What type of mail transport to use for delivering emails. Valid options for `email_backend` are mail, sendmail or smtp. 
The varying options after that are to support the different transports.

#### Alerting

Please see [Alerting](http://docs.librenms.org/Extensions/Alerting/) section of the docs for configuration options.

#### Billing

Please see [Billing](http://docs.librenms.org/Extensions/Billing-Module/) section of the docs for setup and configuration options.

#### Global module support

```php
$config['enable_bgp']                   = 1; # Enable BGP session collection and display
$config['enable_rip']                   = 1; # Enable RIP session collection and display
$config['enable_ospf']                  = 1; # Enable OSPF session collection and display
$config['enable_isis']                  = 1; # Enable ISIS session collection and display
$config['enable_eigrp']                 = 1; # Enable EIGRP session collection and display
$config['enable_syslog']                = 0; # Enable Syslog
$config['enable_inventory']             = 1; # Enable Inventory
$config['enable_pseudowires']           = 1; # Enable Pseudowires
$config['enable_vrfs']                  = 1; # Enable VRFs
$config['enable_printers']              = 0; # Enable Printer support
$config['enable_sla']                   = 0; # Enable Cisco SLA collection and display
```

#### Port extensions

```php
$config['port_descr_parser']            = "includes/port-descr-parser.inc.php";
```
You can extend the included port description parser with your own script here.

```php
$config['enable_ports_etherlike']       = 0;
$config['enable_ports_junoseatmvp']     = 0;
$config['enable_ports_adsl']            = 1;
$config['enable_ports_poe']             = 0;
```
Enable / disable additional port statistics.

#### External integration

```php
$config['rancid_configs'][]             = '/var/lib/rancid/network/configs/';
$config['rancid_ignorecomments']        = 0;
```
Rancid configuration, `rancid_configs` is an array containing all of the locations of your rancid files. 
Setting `rancid_ignorecomments` will disable showing lines that start with #

```php
$config['oxidized']['enabled']         = FALSE;
$config['oxidized']['url']             = 'http://127.0.0.1:8888';
```
To enable Oxidized support set enabled to `TRUE`. URL needs to be configured to point to the REST API for Oxidized. This 
is then used to retrieve the config for devices.


```php
$config['collectd_dir']                 = '/var/lib/collectd/rrd';
```
Specify the location of the collectd rrd files.

```php
$config['smokeping']['dir']             = "/var/lib/smokeping/";
```
Set the smokeping directory location.

```php
$config['nfsen_enable'] = 0;
$config['nfsen_split_char']   = "_";
$config['nfsen_rrds']   = "/var/nfsen/profiles-stat/live/";
$config['nfsen_suffix']   = "_yourdomain_com";
```
NFSen integration support.
`nfsen_split_char` Is the character to replace with full stops to match the device hostname.
`nfsen_rrds` Is the location of the rrd files.
`nfsen_suffix` The domain to remove from the nfsen files.

#### Location mapping

```php
$config['location_map']['Under the Sink'] = "Under The Sink, The Office, London, UK";
```
The above is an example, this will rewrite basic snmp locations so you don't need to configure full location within snmp.

#### Interfaces to be ignored

```php
$config['bad_if'][] = "voip-null";
$config['bad_iftype'][] = "voiceEncap";
```
Numerous defaults exist for this array already (see includes/defaults.inc.php for the full list). You can expand this list 
by continuing the array.
`bad_if` is matched against the ifDescr value.
`bad_iftype` is matched against the ifType value.
`bad_if_regexp` is matched against the ifDescr value as a regular expression.

#### Interfaces to be rewritten

```php
$config['rewrite_if']['cpu'] = 'Management Interface';
$config['rewrite_if_regexp']['/cpu /'] = 'Management ';
```
Entries defined in `rewrite_if` are being replaced completely.
Entries defined in `rewrite_if_regexp` only replace the match.
Matches are compared case-insensitive.

#### Storage configuration

```php
$config['ignore_mount_removable']  = 1;
$config['ignore_mount_network']    = 1;
$config['ignore_mount_optical']    = 1;

$config['ignore_mount'][] = "/kern";
$config['ignore_mount'][] = "/mnt/cdrom";
$config['ignore_mount'][] = "/proc";
$config['ignore_mount'][] = "/dev";

$config['ignore_mount_string'][] = "packages";
$config['ignore_mount_string'][] = "devfs";
$config['ignore_mount_string'][] = "procfs";
$config['ignore_mount_string'][] = "UMA";
$config['ignore_mount_string'][] = "MALLOC";

$config['ignore_mount_regexp'][] = "/on: \/packages/";
$config['ignore_mount_regexp'][] = "/on: \/dev/";
$config['ignore_mount_regexp'][] = "/on: \/proc/";
$config['ignore_mount_regexp'][] = "/on: \/junos^/";
$config['ignore_mount_regexp'][] = "/on: \/junos\/dev/";
$config['ignore_mount_regexp'][] = "/on: \/jail\/dev/";
$config['ignore_mount_regexp'][] = "/^(dev|proc)fs/";
$config['ignore_mount_regexp'][] = "/^\/dev\/md0/";
$config['ignore_mount_regexp'][] = "/^\/var\/dhcpd\/dev,/";
$config['ignore_mount_regexp'][] = "/UMA/";
```
Mounted storage / mount points to ignore in discovery and polling.

#### IRC Bot

Please see [IRC Bot](http://docs.librenms.org/Extensions/IRC-Bot/) section of the docs for configuration options.

#### Authentication

```php
$config['auth_mechanism']           = "mysql";
```
This is the authentication type to use for the WebUI. MySQL is the default and configured when following the installation 
instructions. ldap and http-auth are also valid options. For instructions on the different authentication modules please 
see [Authentication](http://doc.librenms.org/Extensions/Authentication/).

```php
$config['auth_remember']            = '30';
```
If the user selects to be remembered on the login page, how long in days do we remember that use for.

```php
$config['allow_unauth_graphs']      = 0;
$config['allow_unauth_graphs_cidr'] = array();
```
This option will enable unauthenticated access to the graphs from `allow_unauth_graphs_cidr` ranges that you allow. Use 
 of this option is highly discouraged in favour of the [API](http://docs.librenms.org/API/API-Docs/) that is now available.

#### Cleanup options

These options rely on daily.sh running from cron as per the installation instructions.

```php
$config['syslog_purge']                                   = 30;
$config['eventlog_purge']                                 = 30;
$config['authlog_purge']                                  = 30;
$config['perf_times_purge']                               = 30;
```
This option will ensure data within LibreNMS over 1 month old is automatically purged. You can alter these individually, 
values are in days.

#### Syslog options

```php
$config['syslog_filter'][] = "last message repeated";
```
This array can be used to filter out syslog messages that you don't want to be stored or seen within LibreNMS

#### Virtualization

```php
$config['enable_libvirt'] = 1;
$config['libvirt_protocols']    = array("qemu+ssh","xen+ssh");
```
Enable this to switch on support for libvirt along with `libvirt_protocols`
to indicate how you connect to libvirt.  You also need to:

 1. Generate a non-password-protected ssh key for use by LibreNMS, as the
    user which runs polling & discovery (usually `librenms`).
 2. On each VM host you wish to monitor:
   - Configure public key authentication from your LibreNMS server/poller by
     adding the librenms public key to `~root/.ssh/authorized_keys`.
   - (xen+ssh only) Enable libvirtd to gather data from xend by setting
     `(xend-unix-server yes)` in `/etc/xen/xend-config.sxp` and
     restarting xend and libvirtd.

To test your setup, run `virsh -c qemu+ssh://vmhost/system list` or
`virsh -c xen+ssh://vmhost list` as your librenms polling user.
 
#### BGP Support

```php
$config['astext'][65332] = "Cymru FullBogon Feed";
```
You can use this array to rewrite the description of ASes that you have discovered.

#### Auto updates

```php
$config['update'] = 1;
```
By default, LibreNMS will auto update itself every 24 hours. You can stop this from happening by setting `update` to 0.

#### IPMI
Setup the types of IPMI protocols to test a host for and it what order.

```php
$config['ipmi']['type'] = array();
$config['ipmi']['type'][] = "lanplus";
$config['ipmi']['type'][] = "lan";
$config['ipmi']['type'][] = "imb";
$config['ipmi']['type'][] = "open";
```

#### Distributed poller settings

Please see [Distributed Poller](http://docs.librenms.org/Extensions/Distributed-Poller/) section of the docs for setup and configuration options.