在什么网站上做自媒体,知知网站推荐,长沙网站推广排名,东营可以做网站的公司在哪在之前的博客我们看了boot分区删除文件后的修复方法#xff0c;如下#xff1a;Linux boot 分区损坏重建 示例https://www.cndba.cn/dave/article/3534https://www.cndba.cn/dave/article/3535我们这里看一下直接把boot分区删除后的修复过程。 具体步骤如下。https://www.cnd…在之前的博客我们看了boot分区删除文件后的修复方法如下Linux boot 分区损坏重建 示例https://www.cndba.cn/dave/article/3534https://www.cndba.cn/dave/article/3535我们这里看一下直接把boot分区删除后的修复过程。 具体步骤如下。https://www.cndba.cn/dave/article/35351 删除boot分区[rootdave ~]# df -lhFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_dave-lv_root26G 3.0G 22G 12% /tmpfs 3.8G 72K 3.8G 1% /dev/shm/dev/sda1 477M 42M 411M 10% /boot[rootdave ~]# fdisk /dev/sdaWARNING: DOS-compatible mode is deprecated. Its strongly recommended toswitch off the mode (command c) and change display units tosectors (command u).Command (m for help): dPartition number (1-4): 1Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.WARNING: Re-reading the partition table failed with error 16: Device or resource busy.The kernel still uses the old table. The new table will be used atthe next reboot or after you run partprobe(8) or kpartx(8)Syncing disks.[rootdave ~]#[rootdave ~]# partprobeWarning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.[rootdave ~]# reboot删除分区并重启系统后错误和之前一样2 使用Rescue模式修复[davewww.cndba.cn~]# df -lhFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_dave-lv_root26G 3.0G 22G 12% /tmpfs 3.9G 0 3.9G 0% /dev/shm[davewww.cndba.cn~]#手工创建分区注意分区的起始位置[davewww.cndba.cn~]# fdisk /dev/sdaWARNING: DOS-compatible mode is deprecated. Its strongly recommended toswitch off the mode (command c) and change display units tosectors (command u).Command (m for help): nCommand actione extendedp primary partition (1-4)pPartition number (1-4): 1First cylinder (1-3916, default 1):Using default value 1Last cylinder, cylinders or size{K,M,G} (1-63, default 63):Using default value 63Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.WARNING: Re-reading the partition table failed with error 16: Device or resource busy.The kernel still uses the old table. The new table will be used atthe next reboot or after you run partprobe(8) or kpartx(8)Syncing disks.[davewww.cndba.cn~]# fdisk -l /dev/sdaDisk /dev/sda: 32.2 GB, 32212254720 bytes255 heads, 63 sectors/track, 3916 cylindersUnits cylinders of 16065 * 512 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00086488Device Boot Start End Blocks Id System/dev/sda1 1 63 506016 83 Linux/dev/sda2 64 3917 30944256 8e Linux LVM[davewww.cndba.cn~]#重启系统使分区生效[davewww.cndba.cn~]# mkfs.ext4 /dev/sda1mke2fs 1.41.12 (17-May-2010)Filesystem labelOS type: LinuxBlock size1024 (log0)Fragment size1024 (log0)Stride0 blocks, Stripe width0 blocks126976 inodes, 506016 blocks25300 blocks (5.00%) reserved for the super userFirst data block1Maximum filesystem blocks6763315262 block groups8192 blocks per group, 8192 fragments per group2048 inodes per groupSuperblock backups stored on blocks:8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409Writing inode tables: doneCreating journal (8192 blocks): doneWriting superblocks and filesystem accounting information: doneThis filesystem will be automatically checked every 24 mounts or180 days, whichever comes first. Use tune2fs -c or -i to override.[davewww.cndba.cn~]#[davewww.cndba.cn~]# e2label /dev/sda1 /boot[davewww.cndba.cn~]# e2label /dev/sda1/boot[davewww.cndba.cn~]#[davewww.cndba.cn~]# fdisk /dev/sdaWARNING: DOS-compatible mode is deprecated. Its strongly recommended toswitch off the mode (command c) and change display units tosectors (command u).Command (m for help): aPartition number (1-4): 1Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.WARNING: Re-reading the partition table failed with error 16: Device or resource busy.The kernel still uses the old table. The new table will be used atthe next reboot or after you run partprobe(8) or kpartx(8)Syncing disks.[davewww.cndba.cn~]# fdisk -l /dev/sdaDisk /dev/sda: 32.2 GB, 32212254720 bytes255 heads, 63 sectors/track, 3916 cylindersUnits cylinders of 16065 * 512 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00086488Device Boot Start End Blocks Id System/dev/sda1 * 1 63 506016 83 Linux/dev/sda2 64 3917 30944256 8e Linux LVM[davewww.cndba.cn~]#[davewww.cndba.cn~]# mount /dev/sda1 /boot[davewww.cndba.cn~]#[davewww.cndba.cn~]# df -lhFilesystem Size Used Avail Use% Mounted on/dev/mapper/vg_dave-lv_root26G 3.0G 22G 12% /tmpfs 3.9G 0 3.9G 0% /dev/shm/dev/sda1 479M 2.3M 452M 1% /boot[davewww.cndba.cn~]#格式化后新的分区UUID 和/etc/fstab中的会不同通过blkid查看并修改fstab文件https://www.cndba.cn/dave/article/3535[davewww.cndba.cn~]# blkid/dev/mapper/vg_dave-lv_root: UUID7af80925-1650-4b5c-9161-247f05f37923 TYPEext4/dev/loop0: TYPEsquashfs/dev/sda1: LABEL/boot UUID011a5170-18ef-4272-be35-bd7f1221c621 TYPEext4/dev/sda2: UUID2K7Cna-zmCT-l1eX-mN6f-3p9Z-5b8j-0onbLN TYPELVM2_member/dev/mapper/vg_dave-lv_swap: UUID3d592f95-9ad6-41ef-8c53-f30ad47c475e TYPEswap[davewww.cndba.cn~]#[davewww.cndba.cn~]# cat /etc/fstab## /etc/fstab# Created by anaconda on Tue Aug 13 16:23:52 2019## Accessible filesystems, by reference, are maintained under /dev/disk# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info#/dev/mapper/vg_dave-lv_root / ext4 defaults 1 1UUID011a5170-18ef-4272-be35-bd7f1221c621 /boot ext4 defaults 1 2/dev/mapper/vg_dave-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid5,mode620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0[davewww.cndba.cn~]#[davewww.cndba.cn~]# mount /dev/cdrom /mntmount: block device /dev/sr0 is write-protected, mounting read-only[davewww.cndba.cn~]# rpm -ivh /mnt/Packages/kernel-2.6.32-573.el6.x86_64.rpm --forcewarning: /mnt/Packages/kernel-2.6.32-573.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEYPreparing... ########################################### [100%]1:kernel ########################################### [100%][davewww.cndba.cn~]# grub-install /dev/sdaProbing devices to guess BIOS drives. This may take a long time.Installation finished. No error reported.This is the contents of the device map /boot/grub/device.map.Check if this is correct or not. If any of the lines is incorrect,fix it and re-run the script grub-install.(fd0) /dev/fd0(hd0) /dev/sda(hd1) /dev/sdb(hd2) /dev/sdc[davewww.cndba.cn~]#同步grub[davewww.cndba.cn~]# sync我这里没有保留/boot/grub/grub.conf 文件 所有创建一个文件并添加内容也可以通过ISO镜像来直接创建。https://www.cndba.cn/dave/article/3535[davewww.cndba.cngrub]# touch grub.conf[davewww.cndba.cngrub]# vim grub.conf[davewww.cndba.cngrub]# cat grub.confdefault0timeout5splashimage(hd0,0)/grub/splash.xpm.gzhiddenmenutitle Red Hat Enterprise Linux 6 (2.6.32-573.el6.x86_64)root (hd0,0)kernel /vmlinuz-2.6.32-573.el6.x86_64 ro root/dev/mapper/vg_dave-lv_root rd_LVM_LVvg_dave/lv_root rd_NO_LUKS LANGen_US.UTF-8 rd_LVM_LVvg_dave/lv_swap rd_NO_MD SYSFONTlatarcyrheb-sun16 crashkernel128M KEYBOARDTYPEpc KEYTABLEus rd_NO_DM rhgb quietinitrd /initramfs-2.6.32-573.el6.x86_64.img[davewww.cndba.cngrub]#版权声明本文为博主原创文章未经博主允许不得转载。
