Becoming someone else, and which shell you get
su versus sudo -u, login shell versus plain: what sudo -u postgres psql really changes, and why su postgres asks for a password nobody has.
22 minutesTechnical content last reviewed on 16 Sept 2026
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What this lesson builds
- Granting exactly the access a person or process needs
- Narrowing an unknown failure to one component
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Networking: how your server is reached
Addresses, ports and connections: name the failing layer instead of declaring "the network is down".
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