It is really weird that, after several rebuids (CentOS6), I can login with the password before the rebuid.
I donot know the reason. However, when I login, there are so many "Cannot allocate memory" warning.
I cannot execute any command at all.
The free vps is difficult to use, and doubt on the charged vps with low resource.
As I tried, the Hyper VM on freeserver.us has problem to set the root password on CentOS7 64bit / CentOS6 32/64bit.
When you ssh to your server IP, the default password is not the one in Hyper VM, and you can not login.
Other OS are OKey, however, the other os are too old to use.
I will try to change the root password by change the setting file in CentOS6/7. I will update when I make it.
By Frank Lin