persist ip_forward setting across reboots and procps upgrades

Signed-off-by: Jesse Alford <[email protected]>

install-pcf/gcp/terraform/nats.tf

@@ -21,10 +21,11 @@ resource "google_compute_instance" "nat-gateway-pri" {
   }
 
   metadata_startup_script = <<EOF
-#! /bin/bash
-sudo sh -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'
-sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
-EOF
+  #!/bin/bash
+  sudo sysctl -w net.ipv4.ip_forward=1
+  sudo sh -c 'echo net.ipv4.ip_forward=1 | sudo tee -a /etc/sysctl.conf > /dev/null'
+  sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
+  EOF
 }
 
 // NAT Secondary
@@ -50,8 +51,9 @@ resource "google_compute_instance" "nat-gateway-sec" {
   }
 
   metadata_startup_script = <<EOF
-  #! /bin/bash
-  sudo sh -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'
+  #!/bin/bash
+  sudo sysctl -w net.ipv4.ip_forward=1
+  sudo sh -c 'echo net.ipv4.ip_forward=1 | sudo tee -a /etc/sysctl.conf > /dev/null'
   sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
   EOF
 }
@@ -79,8 +81,9 @@ resource "google_compute_instance" "nat-gateway-ter" {
   }
 
   metadata_startup_script = <<EOF
-  #! /bin/bash
-  sudo sh -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'
+  #!/bin/bash
+  sudo sysctl -w net.ipv4.ip_forward=1
+  sudo sh -c 'echo net.ipv4.ip_forward=1 | sudo tee -a /etc/sysctl.conf > /dev/null'
   sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
   EOF
 }