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Systemd: Hidden Gems for a Better Linux
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If you look at the systemd unit for Apache you'll just find
After=network.target
- it doesn't wait-online at all. Apache doesn't really care if you're using NM or systemd-networkd, it simply queries the system (like theip
command does) to know what's going on with the network. It was designed as recommended for moderns programs: it is aware that your network might change and listens for the appropriate signals and takes care of the binds dynamically.