title: Cannot allocate memory: fork: Unable to fork new process on aws
body: <p>I have been getting this error in my server log file.</p>
  
  <blockquote>
    <p>[Sun Jan 29 00:22:43.570300 2017] [mpm_prefork:error] [pid 1205] (12)Cannot 
        allocate memory: AH00159: fork: Unable to fork new process</p>
    
    <p>[Sun Jan 29 00:22:53.742820 2017] [mpm_prefork:error] [pid 1205] (12)Cannot 
        allocate memory: AH00159: fork: Unable to fork new process</p>
    
    <p>[Sun Jan 29 00:23:03.771702 2017] [core:notice] [pid 1205] AH00051: child 
        pid 22134 exit signal Aborted (6), possible coredump in /etc/apache2</p>
    
    <p>[Sun Jan 29 00:23:03.876081 2017] [core:notice] [pid 1205] AH00051: child 
        pid 22135 exit signal Aborted (6), possible coredump in /etc/apache2</p>
    
    <p>[Sun Jan 29 00:23:04.899489 2017] [mpm_prefork:error] [pid 1205] (12)Cannot 
        allocate memory: AH00159: fork: Unable to fork new process</p>
    
    <p>[Sun Jan 29 00:23:14.931272 2017] [mpm_prefork:error] [pid 1205] (12)Cannot 
        allocate memory: AH00159: fork: Unable to fork new process</p>
    
    <p>[Sun Jan 29 00:23:24.965639 2017] [mpm_prefork:error] [pid 1205] (12)Cannot 
        allocate memory: AH00159: fork: Unable to fork new process</p>
    
    <p>[Sun Jan 29 00:23:35.031174 2017] [mpm_prefork:error] [pid 1205] (12)Cannot 
        allocate memory: AH00159: fork: Unable to fork new process</p>
  </blockquote>
  
  <p>help to solving out the issue.</p>