Add systemd basics & unit types
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slides.pdfpc
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slides.pdfpc
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@ -34,3 +34,21 @@ Lennart Poettering of Pulseaudio fame and Kay Sievers decided to implement a new
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### 7
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Systemd's design goals
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### 8
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No more init scripts with opaque effects -> services are clearly defined units
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Unit dependencies -> systemd can figure out what can be started in parallel
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Process supervision: Unit can be configured in many ways, e.g. always restart, only restart on success etc
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Service logs: We'll talk more about this later
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### 9
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Units are the core component of systemd that users deal with. They define services and everything else that systemd needs to start and manage.
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Note that all these are the names of the respective man page on a system with systemd installed
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Types:
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systemd.service - processes controlled by systemd
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systemd.target - equivalent to "runlevels", grouping of units for synchronisation
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systemd.timer - more powerful replacement of cron that starts other units
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systemd.path - systemd equvialent of inotify, watches files/folders -> launches units
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systemd.socket - expose local IPC or network sockets, launch units on connections
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systemd.device - trigger units when certain devices are connected
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systemd.mount - systemd equivalent of fstab entries
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systemd.swap - like mount
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systemd.slice - unit groups for resource management purposes
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... and a few more specialised ones
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40
slides.tex
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slides.tex
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@ -1,6 +1,8 @@
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\documentclass[14pt]{beamer}
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\usetheme{metropolis}
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\newenvironment{code}{\ttfamily}{\par}
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\title{systemd}
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\subtitle{The standard Linux init system}
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@ -50,6 +52,44 @@
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\end{itemize}
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\end{frame}
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\begin{frame}{Systemd - the basics}
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\begin{itemize}
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\item No scripts are executed, only declarative units
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\item Units have explicit dependencies
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\item Processes are supervised
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\item cgroups are utilised to apply resource limits
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\item Service logs are managed and centrally queryable
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\item Much more!
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\end{itemize}
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\end{frame}
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\begin{frame}{Systemd units}
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Units specify how and what to start. Several types exist:
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\begin{code}
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\small
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\begin{columns}[T,onlytextwidth]
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\column{0.5\textwidth}
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\begin{itemize}
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\item systemd.service
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\item systemd.target
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\item systemd.timer
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\item systemd.path
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\item systemd.socket
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\end{itemize}
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\column{0.5\textwidth}
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\begin{itemize}
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\item systemd.device
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\item systemd.mount
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\item systemd.swap
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\item systemd.slice
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\end{itemize}
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\end{columns}
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\end{code}
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\end{frame}
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\begin{frame}{}
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\end{frame}
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\section{Demo}
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\section{Controversies}
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