centos7 启动流程

systemd POST --> Boot Sequence --> Bootloader --> kernel + initramfs(initrd) --> rootfs --> /sbin/init init: CentOS 5: SysV init CentOS 6: Upstart CentOS 7: Systemd Systemd：系统启动和服务器守护进程管理器，负责在系统启动或运行时

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