diff --git a/tools/integration/gce.sh b/tools/integration/gce.sh
index e52a85739..5c3940184 100755
--- a/tools/integration/gce.sh
+++ b/tools/integration/gce.sh
@@ -44,6 +44,10 @@ function vm_names() {
 # Delete all vms in this account
 function destroy() {
     local names
+    # shellcheck disable=SC2046
+    if [ $(gcloud compute firewall-rules list "test-allow-docker$SUFFIX" 2>/dev/null | wc -l) -gt 0 ]; then
+        gcloud compute firewall-rules delete "test-allow-docker$SUFFIX"
+    fi
     names="$(vm_names)"
     # shellcheck disable=SC2086
     if [ "$(gcloud compute instances list --zones "$ZONE" -q $names | wc -l)" -le 1 ]; then
@@ -116,7 +120,10 @@ function setup() {
     destroy
 
     names=($(vm_names))
-    gcloud compute instances create "${names[@]}" --image "$TEMPLATE_NAME" --zone "$ZONE"
+    gcloud compute instances create "${names[@]}" --image "$TEMPLATE_NAME" --zone "$ZONE" --tags "test$SUFFIX" --network=test
+    my_ip="$(curl -s http://ipinfo.io/ip)"
+    gcloud compute firewall-rules create "test-allow-docker$SUFFIX" --network=test --allow tcp:2375,tcp:12375,tcp:4040,tcp:80 --target-tags "test$SUFFIX" --source-ranges "$my_ip"
+
     gcloud compute config-ssh --ssh-key-file "$SSH_KEY_FILE"
     sed -i '/UserKnownHostsFile=\/dev\/null/d' ~/.ssh/config
 
diff --git a/tools/lint b/tools/lint
index b9428d9f2..1589bd9ed 100755
--- a/tools/lint
+++ b/tools/lint
@@ -139,6 +139,20 @@ lint_tf() {
     return $lint_result
 }
 
+lint_md() {
+    local filename="$1"
+    local lint_result=0
+
+    for i in '=======' '>>>>>>>'; do
+        if grep -q "${i}" "${filename}"; then
+            lint_result=1
+            echo "${filename}: bad merge/rebase!"
+        fi
+    done
+
+    return $lint_result
+}
+
 lint() {
     filename="$1"
     ext="${filename##*\.}"
@@ -164,6 +178,7 @@ lint() {
         go) lint_go "${filename}" || lint_result=1 ;;
         sh) lint_sh "${filename}" || lint_result=1 ;;
         tf) lint_tf "${filename}" || lint_result=1 ;;
+        md) lint_md "${filename}" || lint_result=1 ;;
     esac
 
     spell_check "${filename}" || lint_result=1