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In an age where hacker attacks are a daily occurrence, it is of fundamental importance to minimize the attack surface. Containerization is probably the best way to isolate a service provided for the public, but this is not always possible for several reasons. For example, think of a legacy system application developed on systemd. This could make the most of the capabilities provided by a systemd-based operative system and it could be managed via a systemd unit, or it could automatically pull updates using a systemd timer, and so on. For this reason, we are going to explain how to improve the security of a systemd service.
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