diff --git a/base/PHP5Daemon.php b/base/PHP5Daemon.php
index 4aa7f46..f0a6a8c 100644
--- a/base/PHP5Daemon.php
+++ b/base/PHP5Daemon.php
@@ -105,7 +105,7 @@ protected function getArguments(): Vector<string> {
     } else {
       $args = Vector {
         '-b',
-        '127.0.0.1:'.PerfSettings::BackendPort(),
+        'localhost:'.PerfSettings::BackendPort(),
         '-c',
         OSS_PERFORMANCE_ROOT.'/conf/',
       };
diff --git a/base/PerfTarget.php b/base/PerfTarget.php
index bb1e3a8..5b6f896 100644
--- a/base/PerfTarget.php
+++ b/base/PerfTarget.php
@@ -21,9 +21,7 @@ protected function getSanityCheckPath(): string {
   final public function sanityCheck(): void {
     $ctx = stream_context_create(['http' => ['timeout' => 30]]);
     $url =
-      'http://'.
-      gethostname().
-      ':'.
+      'http://localhost:'.
       PerfSettings::HttpPort().
       $this->getSanityCheckPath();
     $content = file_get_contents($url, /* include path = */ false, $ctx);
diff --git a/base/Siege.php b/base/Siege.php
index cbfb6cf..61e4b2b 100644
--- a/base/Siege.php
+++ b/base/Siege.php
@@ -99,7 +99,7 @@ protected function getArguments(): Vector<string> {
     $urls =
       str_replace('__HTTP_PORT__', (string) PerfSettings::HttpPort(), $urls);
     // Siege doesn't support ipv6
-    $urls = str_replace('__HTTP_HOST__', gethostname(), $urls);
+    $urls = str_replace('__HTTP_HOST__', 'localhost', $urls);
     file_put_contents($urls_file, $urls);
 
     if ($this->options->remoteSiege) {
diff --git a/targets/magento1/Magento1Target.php b/targets/magento1/Magento1Target.php
index b5f9a93..da3ea39 100644
--- a/targets/magento1/Magento1Target.php
+++ b/targets/magento1/Magento1Target.php
@@ -128,7 +128,7 @@ public function install(): void {
   }
 
   private function getInstallerArgs(): array {
-    $url = 'http://'.gethostname().':'.PerfSettings::HttpPort().'/';
+    $url = 'http://localhost:'.PerfSettings::HttpPort().'/';
     return array(
       'db_host' => $this->options->dbHost,
       'db_name' => $this->getDatabaseName(),
diff --git a/targets/mediawiki/MediaWikiMLPTarget.php b/targets/mediawiki/MediaWikiMLPTarget.php
index 311cf46..7fed1f7 100644
--- a/targets/mediawiki/MediaWikiMLPTarget.php
+++ b/targets/mediawiki/MediaWikiMLPTarget.php
@@ -55,7 +55,7 @@ public function install(): void {
     );
     if ($this->options->useMemcached) {
       copy(__DIR__.'/Memcached.php', $this->getSourceRoot().'/Memcached.php');
-      $this->replaceInFile('Memcached.php', '__MEMCACHED_HOST__', '127.0.0.1');
+      $this->replaceInFile('Memcached.php', '__MEMCACHED_HOST__', 'localhost');
       $this->replaceInFile('Memcached.php', '__MEMCACHED_PORT__', (string) $this->options->memcachedPort);
       file_put_contents(
         $this->getSourceRoot().'/LocalSettings.php',
diff --git a/targets/mediawiki/MediaWikiTarget.php b/targets/mediawiki/MediaWikiTarget.php
index 39c5e47..017daa8 100644
--- a/targets/mediawiki/MediaWikiTarget.php
+++ b/targets/mediawiki/MediaWikiTarget.php
@@ -56,7 +56,7 @@ public function install(): void {
     );
     if ($this->options->useMemcached) {
       copy(__DIR__.'/Memcached.php', $this->getSourceRoot().'/Memcached.php');
-      $this->replaceInFile('Memcached.php', '__MEMCACHED_HOST__', '127.0.0.1');
+      $this->replaceInFile('Memcached.php', '__MEMCACHED_HOST__', 'localhost');
       $this->replaceInFile('Memcached.php', '__MEMCACHED_PORT__', (string) $this->options->memcachedPort);
       file_put_contents(
         $this->getSourceRoot().'/LocalSettings.php',
diff --git a/targets/sugarcrm/SugarCRMHomePageTarget.php b/targets/sugarcrm/SugarCRMHomePageTarget.php
index e8f3671..b7107be 100644
--- a/targets/sugarcrm/SugarCRMHomePageTarget.php
+++ b/targets/sugarcrm/SugarCRMHomePageTarget.php
@@ -31,7 +31,7 @@ public function getSiegeRCPath(): ?string {
     );
     $config = sprintf(
       "login-url = http://%s:%d/index.php POST %s\n",
-      gethostname(),
+      'localhost',
       PerfSettings::HttpPort(),
       $query_data,
     );
diff --git a/targets/wordpress/WordpressTarget.php b/targets/wordpress/WordpressTarget.php
index 9693137..a69cd58 100644
--- a/targets/wordpress/WordpressTarget.php
+++ b/targets/wordpress/WordpressTarget.php
@@ -47,7 +47,7 @@ public function install(): void {
       $this->options->proxygen
         ? PerfSettings::BackendPort()
         : PerfSettings::HttpPort();
-    $root = 'http://'.gethostname().':'.$visible_port;
+    $root = 'http://localhost:'.$visible_port;
 
     $conn = mysql_connect($this->options->dbHost, 'wp_bench', 'wp_bench');
     $db_selected = mysql_select_db('wp_bench', $conn);
@@ -97,7 +97,7 @@ public function unfreeze(PerfOptions $options): void {
   }
 
   private function unfreezeRequest(PerfOptions $options): void {
-    $url = 'http://'.gethostname().':'.PerfSettings::HttpPort().'/';
+    $url = 'http://localhost:'.PerfSettings::HttpPort().'/';
     $ctx = stream_context_create(
       ['http' => ['timeout' => $options->maxdelayUnfreeze]],
     );