How SysV init and Systemd manage Linux services
Linux SysV init and Systemd essentials
SysV init and systemd are Linux initialization systems that start essential programs during boot and manage system services. SysV init is the older system (1983) using shell scripts in /etc/init.d with runlevels, while systemd is modern with unit files, better documentation, and advanced features like socket activation and resource control. The guide covers systemd unit types (service, target, socket, mount, etc.), systemctl commands for service management, configuration file locations, and journald log management. It also explains SysV init script directories, runlevel management, and backward compatibility between the two systems.
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Linux SysV init and Systemd essentials