How to start service in linux after raising network?

Question

linux

There is a service in /etc/init.d/myservice, it starts before the network is up, how to make the service start after the network is up?

Clarification, 2 providers are configured, one wired second modem. The wired one rises quickly, it takes 40 seconds to start the modem.

Answer 1

put the start of the service in /etc/network/if-up.d
or in the cron
or in the service script, before starting the cycle waiting for the network to turn on or for the ping to pass to some server.
with systemd a couple more options are possible.
etc.
choose.

Answer 2

(/etc/systemd/system/test.service)
[Unit]
Description=test service
Wants=network-online.target
After=network-online.target

[Service]
ExecStart=/root/test.script

[Install]
WantedBy=multi-user.target

systemctl enable test