Missing port interfaces of some gears will cause this. Should fix such gears by calling out expose ports for all components of the gears.

Note to QE : 
1. Create some scalable apps and manually remove the port_interfaces of some of them.
2. Then find out about the broken apps using the query in comment#4.
3. Run the attached script with the uuids from step 2
4. Check mongo to see that port_interfaces are restored.

Also to be tested is that the fix script can be re-run several times without issues.

There is an error executing the re-expose-ports.rb.
The test was performed against devenv-stage_570 on which the gears haven't been flattened(gears were embedded in group_instances)

1. Create one scalable php app with mysql 
2. Delete one port_interface using rockmongo interface
3. Execute the query to list the app uuid needing fix:
libra_rs:PRIMARY> db.applications.find( {"scalable" : true, $where :  "function() {  for(var j=0; j < this.group_instances.length; j++) {for(var i=0; i<this.group_instances[j].gears.length; i++) { if( !this.group_instances[j].gears[i].port_interfaces || this.group_instances[j].gears[i].port_interfaces.length == 0 ) { return true; }}} return false; } " } , { "_id" : 1, "uuid" : 1})
{ "_id" : ObjectId("52a7103109a9c12653000006"), "uuid" : "52a7103109a9c10ae5000001" }
4. Add the uuid to the script, and execute it, an error show up.

[root@ip-10-183-191-83 ~]# ruby re-expose-ports.rb
/opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/attributes.rb:249:in `method_missing': undefined method `has_component?' for #<Gear:0x000000073c8b18> (NoMethodError)
	from /opt/rh/ruby193/root/usr/share/gems/gems/openshift-origin-controller-1.16.12/app/models/gear.rb:268:in `method_missing'
	from re-expose-ports.rb:21:in `block (4 levels) in <main>'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/proxy.rb:143:in `each'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/proxy.rb:143:in `method_missing'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/embedded/many.rb:396:in `method_missing'
	from re-expose-ports.rb:20:in `block (3 levels) in <main>'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/proxy.rb:143:in `each'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/proxy.rb:143:in `method_missing'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/embedded/many.rb:396:in `method_missing'
	from re-expose-ports.rb:19:in `block (2 levels) in <main>'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/proxy.rb:143:in `each'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/proxy.rb:143:in `method_missing'
	from /opt/rh/ruby193/root/usr/share/gems/gems/mongoid-3.0.21/lib/mongoid/relations/embedded/many.rb:396:in `method_missing'
	from re-expose-ports.rb:18:in `block in <main>'
	from re-expose-ports.rb:11:in `each'
	from re-expose-ports.rb:11:in `<main>'

Not sure what code is carried in devenv_stage-570. has_component? method was introduced with 2.0.36 release so it will not be available on AMIs before that.

Could you test it on code from stage-2.0.36?

sorry, I missed the devenv-stage_601 which has stage-2.0.36 and does not have flattened gears.

1. Create one scalable php app with mysql 
2. Delete one port_interface using rockmongo interface
3. Execute the query to list the app uuid needing fix:
libra_rs:PRIMARY> db.applications.find( {"scalable" : true, $where :  "function() {  for(var j=0; j < this.group_instances.length; j++) {for(var i=0; i<this.group_instances[j].gears.length; i++) { if( !this.group_instances[j].gears[i].port_interfaces || this.group_instances[j].gears[i].port_interfaces.length == 0 ) { return true; }}} return false; } " } , { "_id" : 1, "uuid" : 1})

{ "_id" : ObjectId("52a7c897ac7b63c02c00004b"), "uuid" : "52a7c897ac7b630a58000005" }
{ "_id" : ObjectId("52a7cac3ac7b6370a200001a"), "uuid" : "52a7cac3ac7b63253c000003" }
4. Run re-expose-ports.rb 
[root@domU-12-31-39-07-79-26 ~]# ruby re-expose-ports.rb 
Completed exposing ports for 52a7c897ac7b630a58000005
Completed exposing ports for 52a7cac3ac7b63253c000003
5. Re-check mongo, and the applications are fixed.
6. Delete some other port_interfaces, re-execute the script
There are no errors