The following error is reported when executing the yum command:

error: rpmdb: BDB0113 Thread/process 1309432/139989604449152 failed: BDB1507 Thread died in Berkeley DB library
error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery
error: cannot open Packages index using db5 -  (-30973)
error: cannot open Packages database in /var/lib/rpm
Error: Error: rpmdb open failed

Solution:

cd /var/lib/rpm
rm -rf __db*
rpm --rebuilddb

Exception in replication between CentOS virtual machine and host

Question:

Error copying file from host to virtual machine:

Error when getting information for file “//tmp/VMwareDnD/p6v6B6/.”: No such file or directory

It was found that there was a problem with vmtools

resolvent:

1. Uninstalled packages

yum remove open-vm-tools

Prompt after success:

Delete:
  open-vm-tools.x86_64 0:11.0.5-3.el7                                           

Deleted as a dependency:
  open-vm-tools-desktop.x86_64 0:11.0.5-3.el7                                   

Done!

2. Restart

3. Install VMware Tools
return to the main interface of VMware application and click the “install VMware Tools” menu item in the “virtual machine” menu
4. Mount the CD-ROM to the specified directory

Usually, the device directory/dev/CDROM is mounted to the/MNT/CDROM directory.
if the CDROM directory does not exist in the/MNT directory, it is created

Check for CDROM

[root@centos7 /]# ll /mnt/cdrom/
Total 56849
-r-xr-xr-x. 1 xxxx xxxx     1976 3月  25 2020 manifest.txt
-r-xr-xr-x. 1 xxxx xxxx     4943 3月  25 2020 run_upgrader.sh
-r--r--r--. 1 xxxx xxxx     56414224 3月  25 2020 VMwareTools-10.3.22-15902021.tar.gz
-r-xr-xr-x. 1 xxxx xxxx     872044 3月  25 2020 vmware-tools-upgrader-32
-r-xr-xr-x. 1 xxxx xxxx     918184 3月  25 2020 vmware-tools-upgrader-64

Create if/MNT/CDROM does not exist

[root@centos7 /]# mkdir /mnt/cdrom

Mount directory

[root@centos7 /]# mount -t auto /dev/cdrom /mnt/cdrom
mount: /dev/sr0 Write-protected, will mount as read-only
mount: /dev/sr0 is mounted or /mnt/cdrom is busy
       /dev/sr0 has been mounted on /run/media/xxxx/VMware Tools
       /dev/sr0 is already mounted on /mnt/cdrom

Copy the installation package to the user’s home directory

[root@centos7 /]# cp /mnt/cdrom/VMwareTools-10.3.22-15902021.tar.gz /

Unmount

[root@centos7 /]# umount /dev/cdrom

Unzip the installation package

[root@centos7 /]# tar -zxvf VMwareTools-10.3.22-15902021.tar.gz

Installing VMware Tools

Enter the unzipped source directory

[root@centos7 /]# cd vmware-tools-distrib

run vmware-install.pl 文件

[root@centos7 vmware-tools-distrib]# ./vmware-install.pl

Then enter all the way and 0 yes
the last successful prompt

Generating the key and certificate files.
Successfully generated the key and certificate files.
The configuration of VMware Tools 10.3.22 build-15902021 for Linux for this 
running kernel completed successfully.

You must restart your X session before any mouse or graphics changes take 
effect.

To enable advanced X features (e.g., guest resolution fit, drag and drop, and 
file and text copy/paste), you will need to do one (or more) of the following:
1. Manually start /usr/bin/vmware-user
2. Log out and log back into your desktop session
3. Restart your X session.

Found VMware Tools CDROM mounted at /run/media/tong/VMware Tools. Ejecting 
device /dev/sr0 ...
Enjoy,

--the VMware team

Centos7 start error: Entering emergency mode.Exit the shell to continue

input journalctl

journalctl

Then keep pressing the space bar to jump to the last page to see the red part in the figure below. Check the content in brackets behind XFS to see whether it is sda2 or sda3

My name is sda2

Input: XFS_ repair -v -L /dev/sda2

xfs_repair -v -L /dev/sda2

After the repair, enter reboot to restart

reboot