diff --git a/api/main.go b/api/main.go
index b73979e..589288d 100644
--- a/api/main.go
+++ b/api/main.go
@@ -25,8 +25,9 @@ type problem struct {
 }
 
 type outbound struct {
-    Ran    bool    `json:"ran"`
-    Output string  `json:"output"`
+    Generator string  `json:"instance"`
+    Ran       bool    `json:"ran"`
+    Output    string  `json:"output"`
 }
 
 var instance int
@@ -124,6 +125,7 @@ func launch(request inbound, res http.ResponseWriter) {
 
     // prepare response
     outbound := outbound{
+        Generator: fmt.Sprintf("docker-%d", instance),
         Ran: err == nil,
         Output: strings.TrimSpace(stdout.String()),
     }
diff --git a/docker/executors/c b/docker/executors/c
index 9678d29..d4467bf 100755
--- a/docker/executors/c
+++ b/docker/executors/c
@@ -1,2 +1,2 @@
 timeout -s KILL 10 gcc -o binary -x c $1
-timeout -s KILL 3 cat /*.args | xargs -d '\n' ./binary
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' ./binary"
diff --git a/docker/executors/cpp b/docker/executors/cpp
index e639f77..fd3ed82 100755
--- a/docker/executors/cpp
+++ b/docker/executors/cpp
@@ -1,2 +1,2 @@
 timeout -s KILL 10 g++ -o binary -x c++ $1
-timeout -s KILL 3 cat /*.args | xargs -d '\n' ./binary
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' ./binary"
diff --git a/docker/executors/csharp b/docker/executors/csharp
index 6f43b92..410cd60 100755
--- a/docker/executors/csharp
+++ b/docker/executors/csharp
@@ -1,3 +1,3 @@
 cp /*.code .
 timeout -s KILL 10 mcs $(echo $1 | sed 's/\///') -out:binary
-timeout -s KILL 3 cat /*.args | xargs -d '\n' mono binary
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' mono binary"
diff --git a/docker/executors/go b/docker/executors/go
index 822cdad..bcc2d40 100755
--- a/docker/executors/go
+++ b/docker/executors/go
@@ -2,4 +2,4 @@ cp /*.code interim.go
 file="interim.go"
 timeout -s KILL 10 go build $file
 file=${file%%.*}
-timeout -s KILL 3 cat /*.args | xargs -d '\n' ./$file
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' ./$file"
diff --git a/docker/executors/java b/docker/executors/java
index d210f56..fe30da1 100755
--- a/docker/executors/java
+++ b/docker/executors/java
@@ -2,4 +2,4 @@ cp /*.code interim.java
 name=$(cat interim.java | grep -Eo 'public\s+class\s+([A-Za-z0-9]+)' | sed -n 's/  */ /gp' | cut -d' ' -f3)
 mv interim.java $name.java
 timeout -s KILL 10 javac $name.java
-timeout -s KILL 3 cat /*.args | xargs -d '\n' java $name
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' java $name"
diff --git a/docker/executors/nasm b/docker/executors/nasm
index 45c8bc5..bbd0923 100755
--- a/docker/executors/nasm
+++ b/docker/executors/nasm
@@ -1,3 +1,3 @@
 timeout -s KILL 10 nasm -f elf64 -o binary.o $1
 timeout -s KILL 10 ld binary.o -o binary
-timeout -s KILL 3 cat /*.args | xargs -d '\n' ./binary
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' ./binary"
diff --git a/docker/executors/node b/docker/executors/node
index 379297d..de37518 100755
--- a/docker/executors/node
+++ b/docker/executors/node
@@ -1 +1 @@
-timeout -s KILL 3 cat /*.args | xargs -d '\n' nodejs $1
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' nodejs $1"
diff --git a/docker/executors/php b/docker/executors/php
index 6635ac1..6baa0ee 100755
--- a/docker/executors/php
+++ b/docker/executors/php
@@ -1 +1 @@
-timeout -s KILL 3 cat /*.args | xargs -d '\n' php $1
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' php $1"
diff --git a/docker/executors/python2 b/docker/executors/python2
index b8d45f3..a6ef3f2 100755
--- a/docker/executors/python2
+++ b/docker/executors/python2
@@ -1 +1 @@
-timeout -s KILL 3 cat /*.args | xargs -d '\n' python2 $1
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' python2 $1"
diff --git a/docker/executors/python3 b/docker/executors/python3
index a06a39d..13a99c6 100755
--- a/docker/executors/python3
+++ b/docker/executors/python3
@@ -1 +1 @@
-timeout -s KILL 3 cat /*.args | xargs -d '\n' python3.6 $1
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' python3.6 $1"
diff --git a/docker/executors/r b/docker/executors/r
index 3d33f79..1941193 100755
--- a/docker/executors/r
+++ b/docker/executors/r
@@ -1 +1 @@
-timeout -s KILL 3 cat /*.args | xargs -d '\n' Rscript $1
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' Rscript $1"
diff --git a/docker/executors/ruby b/docker/executors/ruby
index 14f4fa0..f058a29 100755
--- a/docker/executors/ruby
+++ b/docker/executors/ruby
@@ -1 +1 @@
-timeout -s KILL 3 cat /*.args | xargs -d '\n' ruby $1
+timeout -s KILL 3 bash -c "cat /*.args | xargs -d '\n' ruby $1"
diff --git a/var/notes.txt b/var/notes.txt
index 8a456c2..c2e4705 100644
--- a/var/notes.txt
+++ b/var/notes.txt
@@ -1,9 +1,25 @@
 create vm
 git piston
+
 install dock and piston units
 systemctl enable dock@{1..10}.service
 systemctl start dock@{1..10}.service
 systemctl enable piston@{1..10}.service
 systemctl start piston@{1..10}.service
+
 install nginx config
-cp /var/lib/docker -> docker-1, ..., docker-10
+
+export image:
+./multidock 1 save -o piston.tar piston:latest
+
+copy in image:
+./multidock 1 load -i piston.tar
+./multidock 2 load -i piston.tar
+./multidock 3 load -i piston.tar
+./multidock 4 load -i piston.tar
+./multidock 5 load -i piston.tar
+./multidock 6 load -i piston.tar
+./multidock 7 load -i piston.tar
+./multidock 8 load -i piston.tar
+./multidock 9 load -i piston.tar
+./multidock 10 load -i piston.tar
diff --git a/var/piston.nginx b/var/piston.nginx
index 5990602..d20052c 100644
--- a/var/piston.nginx
+++ b/var/piston.nginx
@@ -12,9 +12,10 @@ upstream piston {
 }
 
 server {
-    listen 80;
+    listen 1337;
 
     location / {
+        proxy_buffering off;
         proxy_pass http://piston;
     }
 }
diff --git a/var/start_piston b/var/start_piston
new file mode 100755
index 0000000..7cc6559
--- /dev/null
+++ b/var/start_piston
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+systemctl start piston@1.service
+systemctl start piston@2.service
+systemctl start piston@3.service
+systemctl start piston@4.service
+systemctl start piston@5.service
+systemctl start piston@6.service
+systemctl start piston@7.service
+systemctl start piston@8.service
+systemctl start piston@9.service
+systemctl start piston@10.service
+systemctl start dock@1.service
+systemctl start dock@2.service
+systemctl start dock@3.service
+systemctl start dock@4.service
+systemctl start dock@5.service
+systemctl start dock@6.service
+systemctl start dock@7.service
+systemctl start dock@8.service
+systemctl start dock@9.service
+systemctl start dock@10.service
diff --git a/var/stop_piston b/var/stop_piston
new file mode 100755
index 0000000..a32c740
--- /dev/null
+++ b/var/stop_piston
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+systemctl stop piston@{1..10}.service
+systemctl stop dock@{1..10}.service