centos无法进入系统之原因解决办法集合

前言

可爱的小伙伴们，由于精力有限，暂时整理了两类。如果没有你遇到的问题也没有关系，欢迎底下留言评论或私信，小编看到后第一时间帮助解决

一. Centos 7 LVM xfs文件系统修复

情况1：

[sda] Assuming drive cache: write throughInternal error xfs XFS_WANT_CORRUPTED_GOTO at line 1662 of file fs/xfs/libxfs/xfs_alloc.c Caller xfs_free_extent+0x130 [xfs]Internal error xfs_trans_cancel at line 990 of file fs/xfs/xfs_trans.c.Caller xlog_recover_process_efi +0x16b/0x190 [xfs]Corruption of in-memory data detected. Shutting down filesystemPlease umount the filesystem and rectify the problem(s)Failed to recover EFIsGenerating "/run/initramfs/rdsosreport.txt"

如果是LVM管理分区的

ls -l /dev/mapper

xfs_repair /dev/mapper/cl_muban-root

若提示

xfs_repair -L /dev/mapper/cl_muban-root

最后重启

init 6

情况2：

[sda] Assuming drive cache: write throughMetadata corruption detected at xfs_agi_read_verify+0x5e/0x110 [xfs], xfs_agi block 0x2Unmount and run xfs_repairFirst 64 bytes of corrupted metadata buffer:XFS (dm-0)：metadata I/O error: block 0x2 ("xfs_trans_read_buf_map") error 117 numblks 1

修复步骤：

ls -l /dev/mapper

mkdir /mnt

mount /dev/mapper/cl_muban-root /mnt   # 这里也可以操作 提示中的 dm-0 (即 /dev/dm-0，其实/dev/mapper/cl_muban-root是链接到 /dev/dm-0  )

umount /mnt

xfs_repair /dev/mapper/cl_muban-root   # 或 xfs_repair  /dev/dm-0

init 6 (reboot重启系统)

xfs_repair使用方法：

xfs_repair -h
xfs_repair: invalid option -- 'h'
Usage: xfs_repair [options] deviceOptions:
-f The device is a file
-L Force log zeroing. Do this as a last resort.
-l logdev Specifies the device where the external log resides.
-m maxmem Maximum amount of memory to be used in megabytes.
-n No modify mode, just checks the filesystem for damage.
-P Disables prefetching.
-r rtdev Specifies the device where the realtime section resides.
-v Verbose output.
-c subopts Change filesystem parameters - use xfs_admin.
-o subopts Override default behaviour, refer to man page.
-t interval Reporting interval in minutes.
-d Repair dangerously.
-V Reports version and exits.

二. Centos7终端显示-bash-4.2#解决方法

重启进入Linux系统后，发现显示的是-bash-4.2# 而不是root@主机名 + 路径的显示方式，发生这种情况的原因是根目录下缺失几个配置文件，从默认配置中拷贝过来就可以解决了：

cp /etc/skel/.bashrc /root/ 
cp /etc/skel/.bash_profile /root/

\quad\quad如果为虚机且有快照的话，恢复快照有时也可以解决；

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林肯公园

Centos 7 LVM xfs文件系统修复

wxq_Aurora

Centos7终端显示-bash-4.2#解决方法