Add integration test.

example/dns.nomad

@@ -1,9 +1,6 @@
-
 job "dns" {
   datacenters = ["dc1"]
-
   group "dns-group" {
-
     network {
         dns {
             servers = ["127.0.0.1", "127.0.0.2"]
@@ -11,15 +8,17 @@ job "dns" {
             options = ["ndots:2"]
         }
     }
-
     task "dns-task" {
       driver = "containerd-driver"
       config {
         image           = "ubuntu:16.04"
         command         = "sleep"
         args            = ["600s"]
+        sysctl = {
+           "net.core.somaxconn"  = "16384"
+           "net.ipv4.ip_forward" = "1"
+        }
       }
-
       resources {
         cpu    = 500
         memory = 256

tests/006-test-dns.sh

@@ -47,6 +47,20 @@ test_dns_nomad_job() {
        return 1
     fi
 
+    echo "INFO: Checking sysctl net.core.somaxconn=16384"
+    output=$(nomad alloc exec -job ${job_name} cat /proc/sys/net/core/somaxconn)
+    if [ "$output" != "16384" ];then
+        echo "ERROR: Job ${job_name}: sysctl net.core.somaxconn=16384 not found."
+        return 1
+    fi
+
+    echo "INFO: Checking sysctl net.ipv4.ip_forward=1"
+    output=$(nomad alloc exec -job ${job_name} cat /proc/sys/net/ipv4/ip_forward)
+    if [ "$output" != "1" ];then
+        echo "ERROR: Job ${job_name}: sysctl net.ipv4.ip_forward=1 not found."
+        return 1
+    fi
+
     echo "INFO: Stopping nomad ${job_name} job."
     nomad job stop ${job_name}
     job_status=$(nomad job status -short ${job_name}|grep Status|awk '{split($0,a,"="); print a[2]}'|tr -d ' ')