After ssh to machine for the first time I cannot use it.  Sample output:

user@debian:~$ ssh root@107.155.192.4
The authenticity of host '107.155.192.4 (107.155.192.4)' can't be established.
RSA key fingerprint is c8:03:7a:1e:05:1e:db:14:9a:1b:83:f6:12:7c:71:6c.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '107.155.192.4' (RSA) to the list of known hosts.
root@107.155.192.4's password:
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/hostname: Cannot allocate memory
[I have no name!@j ~]# top
-bash: start_pipeline: pgrp pipe: Cannot allocate memory
-bash: top: command not found
[I have no name!@j ~]# pwd
/root
[I have no name!@j ~]# yum update
/usr/bin/python: error while loading shared libraries: libpthread.so.0: cannot open shared object file: Cannot allocate memory
[I have no name!@j ~]# su root
su: user root does not exist
[I have no name!@j ~]#

I have the same probrom, it almost can't run any command, always "cannot allocate memory"

my ip is 107.155.192.2 and 107.155.192.3