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2.2 Linux启动流程-2

  • 2026-03-26 09:18:43
2.2 Linux启动流程-2

2、 7版本启动流程

2.1 启动流程图

启动过程中名词解释
BIOS:加电自检,第一次硬件检测MBR:该磁盘最前面可安装的boot  loader区块   boot loader:启动引导程序,来解决内核文件,加载文件       存在于启动设备的第一个扇区之中加载内核检测硬件与initramfs    内核通常在boot分区中,为/boot/vmlinuz*将内核解压到内存,利用内核检测设备:CPU、内存、硬盘、网卡等    第二次硬盘检测非必要内核功能变成模块,内核不能读取,如SATA等    虚拟文件系统,模拟成为一个根目录,在内存中提供程序,加载启动中所需要的内核模块重新调用systemd,开始后续正常启动

2.2 管理服务状态

[root@localhost ~]# systemctl list-unit-files   #显示状态UNIT FILE                                     STATE   proc-sys-fs-binfmt_misc.automount             static  dev-hugepages.mount                           static  dev-mqueue.mount                              static  proc-sys-fs-binfmt_misc.mount                 static  sys-fs-fuse-connections.mount                 static  sys-kernel-config.mount                       static  sys-kernel-debug.mount                        static  tmp.mount                                     disabled

• loaded:Unit 配置文件已处理

• active(running):一次或多次持续处理的运行

• active(exited):成功完成一次性的配置

• active(waiting):运行中,等待一个事件

• inactive:不运行

• enabled:开机启动

• disabled:开机不启动

• static:开机不启动,但可被另一个启用的服务激活

2.3 运行级别

[root@localhost ~]# ll /usr/lib/systemd/system/*.target|grep runleve   #查看系统运行级别lrwxrwxrwx. 1 root root  15 8月  23 00:55 /usr/lib/systemd/system/runlevel0.target -> poweroff.targetlrwxrwxrwx. 1 root root  13 8月  23 00:55 /usr/lib/systemd/system/runlevel1.target -> rescue.targetlrwxrwxrwx. 1 root root  17 8月  23 00:55 /usr/lib/systemd/system/runlevel2.target -> multi-user.targetlrwxrwxrwx. 1 root root  17 8月  23 00:55 /usr/lib/systemd/system/runlevel3.target -> multi-user.targetlrwxrwxrwx. 1 root root  17 8月  23 00:55 /usr/lib/systemd/system/runlevel4.target -> multi-user.targetlrwxrwxrwx. 1 root root  16 8月  23 00:55 /usr/lib/systemd/system/runlevel5.target -> graphical.targetlrwxrwxrwx. 1 root root  13 8月  23 00:55 /usr/lib/systemd/system/runlevel6.target -> reboot.target
init 0 ——》 systemctl  pweroff        #关机init 1 ——》 systemclt isolate rescue.target    #单用户模式init 3 ——》 systemctl  isolate multi-user.target   #字符界面init 5 ——》 systemctl  isolate graphical.target   #图形化init 6 ——》 systemctl  reboot        #重启

2.4 运行级别切换

[root@localhost ~]# systemctl set-default multi-user.target    #更改默认启动级别为纯字符 init3Removed symlink /etc/systemd/system/default.target.Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/multi-user.target.[root@localhost ~]# systemctl get-default        #查看默认启动级别multi-user.target[root@localhost ~]# systemctl set-default graphical.target    #更改默认启动级别为图形化 init5Removed symlink /etc/systemd/system/default.target.Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/graphical.target.[root@localhost ~]# systemctl get-default        #查看默认启动级别graphical.target   

2.5 grub2与grub区别

七版本
[root@localhost ~]# vim /etc/default/grub GRUB_TIMEOUT=5           #默认等待时间GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"GRUB_DEFAULT=0           #修改默认启动内核顺序GRUB_DISABLE_SUBMENU=trueGRUB_TERMINAL_OUTPUT="console"GRUB_CMDLINE_LINUX="rhgb quiet"GRUB_DISABLE_RECOVERY="true"[root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg   #启用Generating grub configuration file ...Found linux image: /boot/vmlinuz-3.10.0-957.el7.x86_64Found initrd image: /boot/initramfs-3.10.0-957.el7.x86_64.imgFound linux image: /boot/vmlinuz-0-rescue-51b463e7803f477d9f46aa6163e1f85eFound initrd image: /boot/initramfs-0-rescue-51b463e7803f477d9f46aa6163e1f85e.imgdone
六版本
[root@localhost ~]# vim /boot/grub/grub.conf # grub.conf generated by anaconda## Note that you do not have to rerun grub after making changes to this file# NOTICE:  You have a /boot partition.  This means that#          all kernel and initrd paths are relative to /boot/, eg.#          root (hd0,0)#          kernel /vmlinuz-version ro root=/dev/sda3#          initrd /initrd-[generic-]version.img#boot=/dev/sdadefault=0               #修改默认启动内核顺序timeout=5               #默认等待时间 (秒)splashimage=(hd0,0)/grub/splash.xpm.gzhiddenmenutitle CentOS 6 (2.6.32-642.el6.x86_64)        root (hd0,0)        kernel /vmlinuz-2.6.32-642.el6.x86_64 ro root=UUID=b8391479-c2e4-4116-8166-c9da7736e758 rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet        initrd /initramfs-2.6.32-642.el6.x86_64.img~                                                   

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  1. CONNECT:[ UseTime:0.000621s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000528s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003038s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000595s ]
  6. SELECT * FROM `set` [ RunTime:0.000956s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000512s ]
  8. SELECT * FROM `article` WHERE `id` = 482814 LIMIT 1 [ RunTime:0.003783s ]
  9. UPDATE `article` SET `lasttime` = 1774582934 WHERE `id` = 482814 [ RunTime:0.017951s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.001453s ]
  11. SELECT * FROM `article` WHERE `id` < 482814 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000567s ]
  12. SELECT * FROM `article` WHERE `id` > 482814 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000656s ]
  13. SELECT * FROM `article` WHERE `id` < 482814 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003897s ]
  14. SELECT * FROM `article` WHERE `id` < 482814 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003608s ]
  15. SELECT * FROM `article` WHERE `id` < 482814 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003346s ]
0.190232s