その昔、私たち は、起動時にプロセスを立ち上げるために、Unix System V初期化システム（SysV init）、BSD init、Linux Standard Base（LSB）initを持っていた。その時代は消えつつあり、今ではsystemdがLinuxのピカピカの新しいinitシステムだ。もちろん、レガシーなinitシステムをまだ使っているディストリビューションも数多くあるが、systemdはすべての主要なLinuxディストリビューションに採用されている。
この章では、あなたの Linux ディストリビューションが systemd を使っているかどうかを学ぶ。プロセス、スレッド、サービス、デーモンとは何か、systemd を使ってサービスを管理する方法を学ぶ。systemd のシステム・サービス・マネージャであるsystemctlコマンドに習熟する。
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