解决方法:
因缺少database对应的版本目录,手动创建目录,具体操作命令如下:
#cd /etc/x2openEuler/database_2.0.0.630/
#cp -r centos7.6 centos7.9
#cp -r centos7.6-openEuler20.03-LTS-SP1 centos7.9-openEuler20.03-LTS-SP1
#chown -R x2openEuler.x2openEuler centos7.9
#chown -R x2openEuler.x2openEuler centos7.9-openEuler20.03-LTS-SP1/
#cd /etc/x2openEuler/database_2.0.0.630/centos7.9
#mv centos7.6.json centos7.9.json
#cd /etc/x2openEuler/database_2.0.0.630/centos7.9-openEuler20.03-LTS-SP1
#mv centos7.6-openEuler20.03-LTS-SP1.json centos7.9-openEuler20.03-LTS-SP1.json
#cd /etc/x2openEuler/database_2.0.0.630/centos7.9-openEuler20.03-LTS-SP1/x86_64
#mv centos7.6.sqlite centos7.9.sqlite
#mv centos7.6-openEuler20.03-LTS-SP1.sqlite centos7.9-openEuler20.03-LTS-SP1.sqlite