Xen VPS does not start in SolusVM: ImportError: No module named xen.lowlevel.xc

Symptoms 

• VPS does not start - it stays offline in SolusVM > Virtual Servers > VPS
• When trying to start the VPS manually there is an error:

  # xl create /home/xen/vm1977/vm1977.cfg
  Parsing config from /home/xen/vm1977/vm1977.cfg
  libxl: error: libxl_bootloader.c:634:bootloader_finished: bootloader failed - consult logfile /var/log/xen/bootloader.583.log
  libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: bootloader [25835] exited with error status 1
  libxl: error: libxl_create.c:1259:domcreate_rebuild_done: cannot (re-)build domain: -3
  libxl: error: libxl.c:1572:libxl__destroy_domid: non-existant domain 583
  libxl: error: libxl.c:1531:domain_destroy_callback: unable to destroy guest with domid 583
  libxl: error: libxl.c:1460:domain_destroy_cb: destruction of domain 583 failed

• In the log file from the above error /var/log/xen/bootloader.583.log there is the following error:

  CONFIG_TEXT: Traceback (most recent call last):
  File "/usr/lib64/xen/bin/pygrub", line 19, in <module>
  import xen.lowlevel.xc
  ImportError: No module named xen.lowlevel.xc

Cause

Outdated python packages on Xen node

Resolution

1. Connect to Xen node via SSH
2. Install updates:

   # yum update python*