NAME
ifup - network interface management commands
NAME
ifup - bring a network interface up
ifdown - take a network interface down
SYNOPSIS
- ifup [-h] [-a] [-v] [-d] [--allow CLASS] [--with-depends]
-
[-X EXCLUDEPATS] [-f] [-n] [-s] [--print-dependency {list,dot}] [IFACE [IFACE ...]]
- ifdown [-h] [-a] [-v] [-d] [--allow CLASS] [--with-depends]
-
[-X EXCLUDEPATS] [-f] [-n] [--print-dependency {list,dot}] [IFACE [IFACE ...]]
DESCRIPTION
ifup and ifdown commands can be used to configure (or, respectively, deconfigure) network interfaces based on interface definitions in the config file ifupdown2.conf (defaults to /etc/network/interfaces/ file).
ifquery(8) maybe used in conjunction with ifup and ifdown commands to query and validate applied/running configuration.
ifup always works on the current interfaces(5) file defined in ifupdown2.conf (default /etc/network/interfaces). ifdown works on the last applied interface configuration.
ifup on an already ifup'ed interface will re-apply the configuration, skipping already applied configuration wherever possible. In many cases where config commands are idempotent, you will see that ifup/ifdown will reapply the config even if the interface already has that config.
ifup and ifdown understands interface dependency order.
For logical interfaces like vlans, bridges, bonds, ifup creates the interface and ifdown deletes the interface. Use --admin-state option if you only want to administratively bring the interface up/down.
When ifup and ifdown are used with interfaces on command line, they must be have a iface section in the interfaces(5) file.
OPTIONS
positional arguments:
IFACE interface list separated by spaces. IFACE list and '-a' argument are mutually exclusive.
optional arguments:
- -h, --help
-
show this help message and exit
- -a, --all
-
process all interfaces marked "auto"
- -v, --verbose
-
verbose
- -d, --debug
-
output debug info
- --allow CLASS
-
ignore non-"allow-CLASS" interfaces
- -w, --with-depends
-
run with all dependent interfaces. This option is redundant when -a is specified. When '-a' is specified, interfaces are always executed in dependency order.
- -X EXCLUDEPATS, --exclude EXCLUDEPATS
-
Exclude interfaces from the list of interfaces to operate on. Can be specified multiple times If the excluded interface has dependent interfaces, (e.g. a bridge or a bond with multiple enslaved interfaces) then each dependent interface must be specified in order to be excluded.
- -i INTERFACESFILE, --interfaces INTERFACESFILE
-
Uses interfaces file instead of default defined in ifupdown2.conf (default /etc/network/interfaces). Also in ifupdown2.conf, users are not allowed to specify their own interfaces file unless disable_cli_interfacesfile is set to 0 (default is 1).
- -t {native,json}, --interfaces-format {native,json}
-
interfaces file format
- -f, --force
-
force run all operations
- -n, --no-act
-
print out what would happen, but don't do it
- -p, --print-dependency {list,dot}
-
print iface dependency in list or dot format
- -m, --admin-state, --no-scripts
-
don't run any addon modules/scripts. Only bring the interface administratively up/down
- -u, --use-current-config
-
By default ifdown looks at the saved state for interfaces to bring down. This option allows ifdown to look at the current interfaces file. Useful when your state file is corrupted or you want down to use the latest from the interfaces file
- -s, --syntax-check
-
Only run the interfaces file parser
EXAMPLES
# bringing up all interfaces
ifup -a
# bringing up interface list
ifup swp1 swp2
# bringing up interface with its dependents
ifup br0 --with-depends
# bringing down all interfaces
ifdown -a
# bringing down a single interface
ifdown swp1
# excluding interfaces using -X option
ifdown -X eth0 -a
ifup -X eth0 -a
ifdown -X eth0 -X lo -a
# using verbose -v option to see what is going on
ifup -v -a
# using debug -d option to see more of what is going on
ifup -d -a
# ignore errors
ifup -a -f
ifdown -a -f
# run ifdown and ifup on all interfaces using service command/init script
service networking restart
# run ifup on all interfaces using service command/init script
service networking start
# ifdown on all interfaces using service command/init script
service networking stop
# To run ifup/ifdown on only interfaces that changed see ifreload(8)
SEE ALSO
AUTHOR
Roopa Prabhu <[email protected]>
COPYRIGHT
Copyright 2014 Cumulus Networks, Inc. All rights reserved.