systemd-networkd-wait-online.service, systemd-networkd-wait-online@.service, systemd-networkd-wait-online

systemd-networkd-wait-online is a oneshot system service (see systemd.service(5)), that waits for the
       network to be configured. By default, it will wait for all links it is aware of and which are managed by
       systemd-networkd.service(8) to be fully configured or failed, and for at least one link to be online.
       Here, online means that the link's operational state is equal or higher than "degraded". The threshold
       can be configured by --operational-state= option.

       The service systemd-networkd-wait-online.service invokes systemd-networkd-wait-online without any
       options. Thus, it waits for all managed interfaces to be configured or failed, and for at least one to be
       online.

       The service systemd-networkd-wait-online@.service takes an interface name, and invokes
       systemd-networkd-wait-online with -i and the specified interface name. Thus, wait for the specified
       interface to be configured and online. For example, systemd-networkd-wait-online@eth0.service waits for
       eth0 to be configured by systemd-networkd and online.

       systemd-networkd-wait-online.service, systemd-networkd-wait-online@.service, systemd-networkd-wait-online
       - Wait for network to come online

       The following options are understood:

       -iINTERFACE[:MIN_OPERSTATE[:MAX_OPERSTATE]], --interface=INTERFACE[:MIN_OPERSTATE[:MAX_OPERSTATE]]
           Network interface to wait for before deciding if the system is online. This is useful when a system
           has several interfaces which will be configured, but a particular one is necessary to access some
           network resources. When used, all other interfaces are ignored. This option may be used more than
           once to wait for multiple network interfaces. When this option is specified multiple times, then
           systemd-networkd-wait-online waits for all specified interfaces to be online. Optionally, required
           minimum and maximum operational states can be specified after a colon ":". Please see networkctl(1)
           for possible operational states. If the operational state is not specified here, then the value from
           RequiredForOnline= in the corresponding .network file is used if present, and "degraded" otherwise.

           Added in version 213.

       --ignore=INTERFACE
           Network interfaces to be ignored when deciding if the system is online. By default, only the loopback
           interface is ignored. This option may be used more than once to ignore multiple network interfaces.

           Added in version 219.

       -oMIN_OPERSTATE[:MAX_OPERSTATE], --operational-state=MIN_OPERSTATE[:MAX_OPERSTATE]
           Takes a minimum operational state and an optional maximum operational state. Please see networkctl(1)
           for possible operational states. If set, the specified value overrides RequiredForOnline= settings in
           .network files. But this does not override operational states specified in --interface= option.

           Added in version 242.

       -4, --ipv4
           Waiting for an IPv4 address of each network interface to be configured. If this option is specified
           with --any, then systemd-networkd-wait-online exits with success when at least one interface becomes
           online and has an IPv4 address. If the required minimum operational state is below "routable", then
           each link (or at least one link with --any) must have an IPv4 link-local or routable address. If the
           required minimum operational state is "routable", then each link must have an IPv4 routable address.

           If neither --ipv4 nor --ipv6 is specified, then the value from RequiredFamilyForOnline= in the
           corresponding .network file is used if present.

           Added in version 249.

       -6, --ipv6
           Waiting for an IPv6 address of each network interface to be configured. If this option is specified
           with --any, then systemd-networkd-wait-online exits with success when at least one interface becomes
           online and has an IPv6 address. If the required minimum operational state is below "routable", then
           each link (or at least one link with --any) must have an IPv6 link-local or routable address. If the
           required minimum operational state is "routable", then each link must have an IPv6 routable address.

           If neither --ipv4 nor --ipv6 is specified, then the value from RequiredFamilyForOnline= in the
           corresponding .network file is used if present.

           Added in version 249.

       --dns
           Waiting for DNS servers to be accessible on each interface. If this option is specified with --any,
           then systemd-networkd-wait-online exits with success when at least one interface becomes online and
           has an accessible DNS server.

           If a link has the property DefaultRoute=yes (either because the DNSDefaultRoute= network property is
           explicitly configured, or because the link does not have any "routing-only" domains), or if the
           search domain "." is configured, then wait for link-specific DNS servers to be accessible. Otherwise,
           allow global DNS servers to satisfy the condition.

           Added in version 258.

       --any
           Even if several interfaces are in configuring state, systemd-networkd-wait-online exits with success
           when at least one interface becomes online. When this option is specified with --interface=, then
           systemd-networkd-wait-online waits for one of the specified interfaces to be online. This option is
           useful when some interfaces may not have carrier on boot.

           Added in version 242.

       --timeout=SECS
           Fail the service if the network is not online by the time the timeout elapses. A timeout of 0
           disables the timeout. Defaults to 120 seconds.

           Added in version 219.

       -q, --quiet
           Suppress log messages.

           Added in version 242.

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

systemd(1), systemd.service(5), systemd-networkd.service(8), networkctl(1)

systemd 257.7                                                               SYSTEMD-NETWORK...-ONLINE.SERVICE(8)

       systemd-networkd-wait-online.service

       systemd-networkd-wait-online@.service

       /usr/lib/systemd/systemd-networkd-wait-online