title: Amazon EC2 micro instance not responding
body: <p>I have a couple of micro instances that have been working fine for weeks. Both are running WordPress blogs. In the last 24 hours one of them has stopped. I can't ssh in even after a reboot. The other instance is working fine. </p>
  
  <pre><code>ssh: connect to host ec2-xxx-xxx-xxx-xxx.ap-southeast-1.compute.amazonaws.com port 22: Operation timed out
  </code></pre>
  
  <p>There in nothing obvious in the log that looks like a problem. The last few lines are: </p>
  
  <pre><code>cloud-init:  runcmd[  OK  ]
  Mounting other filesystems:  [  OK  ]
  Retrigger failed udev events[  OK  ]
  Generating SSH1 RSA host key: [  OK  ]
  Starting sshd: [  OK  ]
  Starting ntpd: [  OK  ]
  Starting sendmail: [  OK  ]
  Starting sm-client: [  OK  ]
  Starting crond: [  OK  ]
  [  OK  ]
  Starting atd: [  OK  ]
  Starting yum-updatesd: [  OK  ]
  Running cloud-init user-scripts (none found)[  OK  ]
  Amazon Linux AMI release 2011.02.1.1 (beta)
  Kernel 2.6.35.11-83.9.amzn1.i686 on an i686
  ip-xx-xxx-xx-xx login:
  </code></pre>
  
  <p>The management console states that everything is running and normal.<br>
  I use the same security group and .pem file for both instances. </p>
  
  <p>I suspect that this instance has been getting more traffic than the other one. Is there anyway that the micro instance could run out of memory and just stop responding? What could be going wrong?</p>
  
  <p><a href="http://cl.ly/2W1a3V1G0y1Z030L0W06" rel="noreferrer">Here is a screen shot of the Monitoring panel</a></p>
  
  <p>Thanks</p>