KVM VPS shuts down right after start: qemu-kvm invoked oom-killer

Symptoms 

• KVM VPS shuts down right after start
• OOM killer error is generated in the log /var/log/messages on the KVM slave node:

  CONFIG_TEXT: Oct 28 02:25:16 ns3093079 kernel: qemu-kvm invoked oom-killer: gfp_mask=0xd0, order=0, oom_adj=0, oom_score_adj=0
  Oct 28 02:25:16 ns3093079 kernel: [<ffffffff81136f32>] ? oom_kill_process+0x82/0x2a0
  Oct 28 02:25:16 ns3093079 kernel: [<ffffffff81193cfe>] ? mem_cgroup_oom_synchronize+0x2be/0x2c0
  Oct 28 02:25:16 ns3093079 kernel: [<ffffffff81190f30>] ? memcg_oom_wake_function+0x0/0xa0
  Oct 28 02:25:17 ns3093079 kernel: [ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name

Cause

Insufficient swap memory on the node

Resolution

Increase swap space using one of the following guides:

Creating an LVM2 Logical Volume for Swap
How To Add Swap