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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I would like to be able to create a security group rule which allows communication between VMs within the group. Using the EC2 API this can be done as follows:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>rjh@cloud1:~$ euca-describe-groups<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>GROUP rjhproject default default<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject default ALLOWS tcp 22 22 FROM CIDR 0.0.0.0/0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject default ALLOWS icmp -1 -1 FROM CIDR 0.0.0.0/0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject default ALLOWS tcp 80 80 GRPNAME default<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>rjh@cloud1:~$ euca-add-group -d 'permissive group' rjhgroup<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>GROUP rjhgroup permissive group<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>rjh@cloud1:~$ euca-authorize -o rjhgroup rjhgroup<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>rjhgroup rjhgroup None tcp None None 0.0.0.0/0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>GROUP rjhgroup<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhgroup ALLOWS tcp GRPNAME rjhgroup FROM CIDR 0.0.0.0/0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>rjh@cloud1:~$ euca-describe-groups<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>GROUP rjhproject default default<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject default ALLOWS tcp 22 22 FROM CIDR 0.0.0.0/0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject default ALLOWS icmp -1 -1 FROM CIDR 0.0.0.0/0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject default ALLOWS tcp 80 80 GRPNAME default<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>GROUP rjhproject rjhgroup permissive group<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject rjhgroup ALLOWS icmp -1 -1 GRPNAME rjhgroup<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject rjhgroup ALLOWS tcp 1 65535 GRPNAME rjhgroup<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>PERMISSION rjhproject rjhgroup ALLOWS udp 1 65536 GRPNAME rjhgroup<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So, it looks like security groups support the notion of a group with rules that mention the group containing the rule as a source. However, the security_groups.py extension contains an explicit check that the source group id is not the same as the parent group id. Why is this done? I would like to remove this restriction allowing rules to be created similar to the one created above using EC2. Any objections?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-Ray Hookway (rjh)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>