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VNSTAT(1) User Manuals VNSTAT(1) NAME vnstat - a console-based network traffic monitor SYNOPSIS vnstat [-5bDedhlmqstvy?] [--95th] [--add] [--alert output exit type condi- tion limit unit] [--begin date] [--config file] [--days [limit]] [--db file] [--dbdir directory] [--dbiflist [mode]] [--debug] [--end date] [--fiveminutes [limit]] [--help] [-hg] [--hours [limit]] [--hoursgraph] [-i interface] [--iface interface] [--iflist [mode]] [--json [mode] [limit]] [--limit limit] [--live [mode]] [--locale locale] [--longhelp] [--merge source destination] [--months [limit]] [--oneline [mode]] [--query [mode]] [--rateunit [mode]] [--remove] [--rename name] [-ru [mode]] [--setalias alias] [--short] [--showconfig] [--style number] [--top [limit]] [-tr [time]] [--traffic [time]] [--version] [--xml [mode] [limit]] [--years [limit]] [interface] DESCRIPTION vnStat is a console-based network traffic monitor. It keeps a log of 5 minute interval, hourly, daily, monthly and yearly network traffic for the selected interface(s). However, it isn't a packet sniffer. The traffic in- formation is read from the proc(5) or sys filesystems depending on avail- ability resulting in light use of system resources regardless of network traffic rate. That way vnStat can be used even without root permissions on most systems. Functionality is divided into two commands. The purpose of the vnstat com- mand is to provide an interface for querying the traffic information stored in the database whereas the daemon vnstatd(8) is responsible for data re- trieval, caching and storage. Although the daemon process is constantly running as a service, it is actually spending most of its time sleeping be- tween data updates. OPTIONS --95th Show 95th percentile output for the ongoing month. This output uses the 5 minute resolution data of the ongoing month to calculate the 95th percentile traffic rate for received, transmitted and total. In addition, the minimum, average and maximum traffic rates for re- ceived, transmitted and total are also shown. This output requires the 5MinuteHours configuration option to have a value of at least 744 for storing all the necessary data, otherwise 100% coverage isn't possible. --add Create database entry for interface specified with -i or --iface op- tion. The daemon can be running during this operation and will auto- matically start monitoring the interface without a restart within SaveInterval minutes if configuration option RescanDatabaseOnSave is enabled. Otherwise the daemon needs to be restarted in order for the added interface to be monitored. --alert output exit type condition limit unit Depending on values of given parameters, show alert, use different exit status or a combination of both when configured situation is met. output parameter takes a number from 0 to 3 and controls when, if at all, the command will result in output. '0' never produces output, '1' always produces output, '2' shows output only when usage esti- mate exceeds limit and '3' shows output only when limit is exceeded. exit parameter takes a number from 0 to 5 and controls the exit sta- tus of the command. '0' always uses exit status 0, '1' always uses exit status 1, '2' uses exit status 1 if usage estimate exceeds limit but otherwise exit status 0 and '3' uses exit status 1 if limit is exceeded but otherwise exit status 0. '4' and '5' are equivalents of '2' and '3' with the difference that exit status 2 is used instead of exit status 1 when the condition is met. This can help differentiate alerts from errors as errors will always use exit status 1. type parameter defines to which time range type usage the limit is compared against. Available options: 'h', 'hour', 'hourly', 'd', 'day', 'daily', 'm', 'month', 'monthly', 'y', 'year', 'yearly', 'p', '95', '95%'. condition parameter defines if limit is compared to received (rx), transmitted (tx), total or estimated usage of these three. Avail- able options: 'rx', 'tx', 'total', 'rx_estimate', 'tx_estimate', 'total_estimate'. Estimate options aren't available for 95th per- centile type. limit is a greater than zero integer without decimals which defines the traffic usage limit using the unit defined with the unit parame- ter. unit accepts the following options: 'B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB'. For 95th percentile type the following options are available: 'B/s', 'KiB/s', 'MiB/s', 'GiB/s', 'TiB/s', 'PiB/s', 'EiB/s', 'kB/s', 'MB/s', 'GB/s', 'TB/s', 'PB/s', 'EB/s', 'bit/s', 'Kibit/s', 'Mibit/s', 'Gibit/s', 'Tibit/s', 'Pibit/s', 'Eibit/s', 'kbit/s', 'Mbit/s', 'Gbit/s', 'Tbit/s', 'Pbit/s', 'Ebit/s'. Usage must exceed limit in order for the alarm to activate. Exactly the same usage as limit does not raise the alarm. Estimate calculation isn't limited to the estimate options in condi- tion parameter but can also be achieved by using the estimate option in output or exit parameters. Missing or invalid parameters or para- meter combination will result in --alert specific help output being shown. -b, --begin date Begin the list output with a specific date / time defined by date instead of the begin being selected based on the number of entries to be shown. If date isn't available in the database then the clos- est later date will be used. date supports the following formats: YYYY-MM-DD HH:MM, YYYY-MM-DD and "today". This option can only be used with --json , --xml and list outputs. --config file Use file as configuration file instead of using automatic configura- tion file search functionality. If --config is used multiple times, the configuration settings from files later on the command line will override configuration settings loaded from earlier files if the settings defined in the files overlap. -d, --days [limit] Show traffic statistics on a daily basis for the last days. The length of the list will be limited to 30 entries unless configured otherwise or unless the optional limit parameter is used. All en- tries stored in the database will be shown if limit is set to 0. --db file Use file as database file instead of searching for a database from the directory specified in the configuration file or the hardcoded default if no configuration file is available. This option over- rides --dbdir. --dbdir directory Use directory as database directory instead of using the directory specified in the configuration file or the hardcoded default if no configuration file is available. This option is ignored if --db is also defined. --dbiflist [mode] List interfaces currently in the database. If mode is not defined or is set to 0 then the output will use a one line verbose format. If mode is set to 1 then the output will contain one interface per line and if mode is set to 2 then only the interface count will be shown as a single number. See also --iflist. -D, --debug Show additional debug output. -e, --end date End the list output with a specific date / time defined by date in- stead of the latest date / time in the database. If date isn't available in the database then the closest earlier date will be used. date supports the following formats: YYYY-MM-DD HH:MM and YYYY-MM-DD. This option can only be used with --json , --xml and list outputs. In list outputs the estimate line is replaced with a sum line with values representing the sums of each column. The sum line is shown only if the output consists of more than one data line. This is applicable even if the defined date is the same as the current date. The top list also requires --begin to be used at the same time with this option. -5, --fiveminutes [limit] Show traffic statistics with a 5 minute resolution for the last hours. The length of the list will be limited to 24 entries unless configured otherwise or unless the optional limit parameter is used. All entries stored in the database will be shown if limit is set to 0. -h, --hours [limit] Show traffic statistics on a hourly basis. The length of the list will be limited to 24 entries unless configured otherwise or unless the optional limit parameter is used. All entries store in the data- base will be shown if the limit is set to 0. -hg, --hoursgraph Show traffic statistics on a hourly basis for the last 24 hours us- ing a bar graph followed by a table representing the numerical data. -i, --iface interface Select one specific interface and apply actions to only it. For database queries, it is possible to merge the information of two or more interfaces using the interface1+interface2+... syntax. All provided interfaces must be unique and must exist in the database when the merge syntax is used. Optionally, depending on the Inter- faceMatchMethod configuration setting, interface can be replaced with alias previously set using --setalias. Merge syntax isn't sup- ported when alias is used. The -i, --iface option is optional and interface can be used as parameter on the command line for selecting the used interface even without the option being explicitly used. --iflist [mode] List currently available interfaces. If mode is not defined or is set to 0 then the output will use a one line verbose format. If mode is set to 1 then the output will contain one interface per line and if mode is set to 2 then only the interface count will be shown as a single number. See also --dbiflist. --json [mode] [limit] Show database content for selected interface or all interfaces in json format. All traffic values in the output are in bytes unless otherwise indicated by the name of the key. An optional mode parame- ter can be used for limiting the output to only selected informa- tion. Everything except the 95th percentile output is shown by de- fault. Setting mode to 's' will output a summary containing the last 2 entries of 5 minute, hourly, daily, monthly and yearly resolution data, 'f' will output only 5 minute resolution entries, 'h' hours, 'd' days, 'm' months, 'y' years, 't' the top days and 'p' the 95th percentile. Alternatively or in combination with mode an optional limit parameter can be used to limit the number of entries in the output. The --json option can be used in combination with -l, --live and -tr options without mode or limit having any effect to the out- put. The jsonversion field in the output contains the API version information. It will be changed only when the names or structures of previously existing content gets changed. In comparison, the vn- statversion field exists only as extra information. --limit limit Set the maximum number of shown entries in list outputs to limit. Usage of --limit overrides the default list entry limit values and the optional limit parameter given directly for a list query. All entries stored in the database will be shown if limit is set to 0. --limit can also be used to control the length of --json and --xml outputs. -l, --live [mode] Display current transfer rate for the selected interface in real time until interrupted. Statistics will be shown after interruption if the runtime was more than 10 seconds. An optional mode parameter can be used to select between the displaying of packets per second (mode 0) and transfer counters (mode 1) during execution. --style can also be used to affect the layout of the output. The output will be in json format if used in combination with --json option. --locale locale Use locale instead of using the locale setting specified in the con- figuration file or the system default if no configuration file is available. --longhelp Show complete options list. --merge source destination Merge interface data from source database to destination database. Unless interfaces are specified, all interfaces from source will be merged to destination. A new database will be created if destina- tion doesn't exist. If an interface of the same name doesn't exist in destination then a direct copy action for the data from source will be executed. If an interface of the same name already exists in destination then an additive merge action will be executed. The source database is always accessed as read-only and will never be modified by the merge actions. Changes to the destination database cannot be reversed as subtraction actions aren't supported. Execu- tion of the merge needs to be acknowledged with an additional para- meter. If this additional parameter isn't provided then a preview of the actions with additional guidance will be shown. Both source and destination can either refer directly to database files or use an alternative file:interface syntax where the database file is suffixed with : followed with an interface name. When used as source, the alternative syntax allows specifying one interface to be merged from source to destination instead of all interfaces being merged. Additionally, it's possible to use the alternative syntax in destination for specifying to which interface the data will be merged to. -m, --months [limit] Show traffic statistics on a monthly basis for the last months. The length of the list will be limited to 12 entries unless configured otherwise or unless the optional limit parameter is used. All en- tries stored in the database will be shown if limit is set to 0. --oneline [mode] Show traffic summary for selected interface using one line with a parsable format. The output contains 15 fields with ; used as field delimiter. The 1st field contains the API version information of the output that will only be changed in future versions if the field content or structure changes. The following fields in order 2) in- terface name, 3) timestamp for today, 4) rx for today, 5) tx for to- day, 6) total for today, 7) average traffic rate for today, 8) time- stamp for current month, 9) rx for current month, 10) tx for current month, 11) total for current month, 12) average traffic rate for current month, 13) all time total rx, 14) all time total tx, 15) all time total traffic. An optional mode parameter can be used to force all fields to output in bytes without the unit itself shown. -q, --query [mode] Force database query mode. An optional mode parameter can be used to override the default query mode. 'a' results in short summary output being used when there are more than one interface in the database, otherwise regular summary output is used. 's' results in regular summary output being shown for one interface regardless of the num- ber of interfaces in the database. When the optional mode parameter isn't defined, the configured QueryMode will be used instead. --remove Delete the database entry for the interface specified with -i or --iface and stop monitoring it. The daemon can be running during this operation and will automatically detect the change. --rename name Rename the interface specified with -i or --iface in the database with new name name. The new name cannot already exist in the data- base. This operation doesn't cause any data loss. The daemon should not be running during this operation. -ru, --rateunit [mode] Swap the configured rate unit. If rate has been configured to be shown in bytes then rate will be shown in bits if this option is present. In the same way, if rate has been configured to be shown in bits then rate will be shown in bytes when this option is present. Alternatively, mode with either 0 or 1 can be used as parameter for this option in order to select between bytes (0) and bits (1) re- gardless of the configuration file setting. --setalias alias Set alias as an alias for the selected interface to be shown in queries. The set alias can be removed by specifying an empty string for alias. The daemon can be running during this operation. -s, --short Use short output mode. This mode is also used when more than one in- terface is available in the database and no specific interface is selected. --showconfig Show current configuration using the same format as the configura- tion file itself uses. --style number Modify the content and style of outputs. Set number to 0 for a nar- rower output, 1 for enabling bar column, 2 for same as previous but with average traffic rate visible in summary output and 3 for en- abling average traffic rate in all outputs where it is supported. 4 disables the use of terminal control characters in -l, --live and -tr, --traffic modes. -t, --top [limit] Show all time top traffic days. The length of the list will be lim- ited to 10 entries unless configured otherwise or unless the op- tional limit parameter is used. All entries stored in the database will be shown if limit is set to 0. When used with --begin and op- tionally with --end, the list will be generated using the daily data instead of separate top entries. The availability of daily data de- fines the boundaries the date specific query can access. -tr, --traffic [time] Calculate how much traffic goes through the selected interface dur- ing the given time seconds. The time will be 5 seconds if a number parameter isn't specified. The output will be in json format if used in combination with --json option. However, in that case, the count- down before results isn't shown. --style can also be used to affect the layout of the output. -v, --version Show current version. --xml [mode] [limit] Show database content for selected interface or all interfaces in xml format. All traffic values in the output are in bytes unless otherwise indicated by the name of the key. An optional mode parame- ter can be used for limiting the output to only selected informa- tion. Everything except the 95th percentile output is shown by de- fault. Setting mode to 's' will output a summary containing the last 2 entries of 5 minute, hourly, daily, monthly and yearly resolution data, 'f' will output only 5 minute resolution entries, 'h' hours, 'd' days, 'm' months, 'y' years, 't' the top days and 'p' the 95th percentile. Alternatively or in combination with mode an optional limit parameter can be used to limit the number of entries in the output. The xmlversion field in the output contains the API version information. It will be changed only when the names or structures of previously existing content gets changed. In comparison, the vn- statversion field exists only as extra information. -y, --years [limit] Show traffic statistics on a yearly basis for the last years. The list will show all entries by default unless configured otherwise or unless the optional limit parameter is used. All entries stored in the database will also be shown if limit is set to 0. -?, --help Show a command option summary. FILES /var/lib/vnstat/ Default database directory. /etc/vnstat.conf Config file that will be used unless $HOME/.vnstatrc exists. See vn- stat.conf(5) for more information. EXAMPLES vnstat Display traffic summary for the default interface or multiple inter- faces when more than one is monitored. vnstat -i eth0+eth1+eth3 Display traffic summary for a merge of interfaces eth0, eth1 and eth3. vnstat -i eth2 --xml Output all information about interface eth2 in xml format. vnstat --json Output all information of all monitored interfaces in json format. vnstat -i eth0 --setalias local Give interface eth0 the alias "local". That information will be later visible as a label when eth0 is queried. vnstat -i eth2 --remove Delete database entries for interface eth2 and stop monitoring it. RESTRICTIONS Updates need to be executed at least as often as it is possible for the in- terface to generate enough traffic to overflow the kernel interface traffic counter. Otherwise, it is possible that some traffic won't be seen. With 32-bit interface traffic counters, the maximum time between two updates de- pends on how fast the interface can transfer 4 GiB. Note that there is no guarantee that a 64-bit kernel has 64-bit interface traffic counters for all interfaces. Calculated theoretical times are: 10 Mbit: 54 minutes 100 Mbit: 5 minutes 1000 Mbit: 30 seconds Virtual and aliased interfaces cannot be monitored because the kernel doesn't provide traffic information for that type of interfaces. Such in- terfaces are usually named eth0:0, eth0:1, eth0:2 etc. where eth0 is the actual interface being aliased. Using long date output formats may cause misalignment in shown columns if the length of the date exceeds the fixed size allocation. AUTHOR Teemu Toivola <tst at iki dot fi> SEE ALSO vnstatd(8), vnstati(1), vnstat.conf(5), proc(5), ifconfig(8), units(7) version 2.13 FEBRUARY 2025 VNSTAT(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | EXAMPLES | RESTRICTIONS | AUTHOR | SEE ALSO
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