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Daemon Management Under Systemd
;login: Enters a New Phase of Its Evolution
For over 20 years, ;login: has been a print magazine with a digital version; in the two decades previous, it was USENIX’s newsletter, UNIX News. Since its inception 45 years ago, it has served as a medium through which the USENIX community learns about useful tools, research, and events from one another. Beginning in 2021, ;login: will no longer be the formally published print magazine as we’ve known it most recently, but rather reimagined as a digital publication with increased opportunities for interactivity among authors and readers.
Since USENIX became an open access publisher of papers in 2008, ;login: has remained our only content behind a membership paywall. In keeping with our commitment to open access, all ;login: content will be open to everyone when we make this change. However, only USENIX members at the sustainer level or higher, as well as student members, will have exclusive access to the interactivity options. Rik Farrow, the current editor of the magazine, will continue to provide leadership for the overall content offered in ;login:, which will be released via our website on a regular basis throughout the year.
As we plan to launch this new format, we are forming an editorial committee of volunteers from throughout the USENIX community to curate content, meaning that this will be a formally peer-reviewed publication. This new model will increase opportunities for the community to contribute to ;login: and engage with its content. In addition to written articles, we are open to other ideas of what you might want to experience.
The systemd project is the basic user-space building block used to construct a modern Linux OS. The main daemon, systemd, is the first process started by the kernel, and it brings up the system and acts as a service manager. This article shows how to start a daemon under systemd, describes the supervision and management capabilities that systemd provides, and shows how they can be applied to turn a simple application into a robust and secure daemon. It is a common misconception that systemd is somehow limited to desktop distributions. This is hardly true; similarly to the Linux kernel, systemd supports and is used on servers and desktops, but it is also in the cloud and extends all the way down to embedded devices. In general it tries to be as portable as the kernel. It is now the default on new installations in Debian, Ubuntu, Fedora/RHEL/CentOS, OpenSUSE/SUSE, Arch, Tizen, and various derivatives.