The GitLab Pages external-http and external-https arguments can be specified multiple times

config/gitlab.yml.example

@@ -157,8 +157,8 @@ production: &base
     host: example.com
     port: 80 # Set to 443 if you serve the pages with HTTPS
     https: false # Set to true if you serve the pages with HTTPS
-    # external_http: "1.1.1.1:80" # If defined, enables custom domain support in GitLab Pages
-    # external_https: "1.1.1.1:443" # If defined, enables custom domain and certificate support in GitLab Pages
+    # external_http: ["1.1.1.1:80", "[2001::1]:80"] # If defined, enables custom domain support in GitLab Pages
+    # external_https: ["1.1.1.1:443", "[2001::1]:443"] # If defined, enables custom domain and certificate support in GitLab Pages
 
   ## Mattermost
   ## For enabling Add to Mattermost button

config/initializers/1_settings.rb

@@ -278,8 +278,8 @@ Settings.pages['host']            ||= "example.com"
 Settings.pages['port']            ||= Settings.pages.https ? 443 : 80
 Settings.pages['protocol']        ||= Settings.pages.https ? "https" : "http"
 Settings.pages['url']             ||= Settings.send(:build_pages_url)
-Settings.pages['external_http']   ||= false if Settings.pages['external_http'].nil?
-Settings.pages['external_https']  ||= false if Settings.pages['external_https'].nil?
+Settings.pages['external_http']   ||= false unless Settings.pages['external_http'].present?
+Settings.pages['external_https']  ||= false unless Settings.pages['external_https'].present?
 
 #
 # Git LFS

doc/administration/pages/index.md

@@ -26,9 +26,9 @@ it works.
 
 ---
 
-In the case of [custom domains](#custom-domains) (but not 
-[wildcard domains](#wildcard-domains)), the Pages daemon needs to listen on 
-ports `80` and/or `443`. For that reason, there is some flexibility in the way 
+In the case of [custom domains](#custom-domains) (but not
+[wildcard domains](#wildcard-domains)), the Pages daemon needs to listen on
+ports `80` and/or `443`. For that reason, there is some flexibility in the way
 which you can set it up:
 
 1. Run the Pages daemon in the same server as GitLab, listening on a secondary IP.
@@ -65,11 +65,13 @@ you need to add a [wildcard DNS A record][wiki-wildcard-dns] pointing to the
 host that GitLab runs. For example, an entry would look like this:
 
 ```
-*.example.io. 1800 IN A 1.1.1.1
+*.example.io. 1800 IN A    1.1.1.1
+*.example.io. 1800 IN AAAA 2001::1
 ```
 
 where `example.io` is the domain under which GitLab Pages will be served
-and `1.1.1.1` is the IP address of your GitLab instance.
+and `1.1.1.1` is the IPv4 address of your GitLab instance and `2001::1` is the
+IPv6 address. If you don't have IPv6, you can omit the AAAA record.
 
 > **Note:**
 You should not use the GitLab domain to serve user pages. For more information
@@ -141,7 +143,8 @@ outside world.
 In addition to the wildcard domains, you can also have the option to configure
 GitLab Pages to work with custom domains. Again, there are two options here:
 support custom domains with and without TLS certificates. The easiest setup is
-that without TLS certificates.
+that without TLS certificates. In either case, you'll need a secondary IP. If
+you have IPv6 as well as IPv4 addresses, you can use them both.
 
 ### Custom domains
 
@@ -163,11 +166,12 @@ world. Custom domains are supported, but no TLS.
     pages_external_url "http://example.io"
     nginx['listen_addresses'] = ['1.1.1.1']
     pages_nginx['enable'] = false
-    gitlab_pages['external_http'] = '1.1.1.2:80'
+    gitlab_pages['external_http'] = ['1.1.1.2:80', '[2001::2]:80']
     ```
 
     where `1.1.1.1` is the primary IP address that GitLab is listening to and
-    `1.1.1.2` the secondary IP where the GitLab Pages daemon listens to.
+    `1.1.1.2` and `2001::2` are the secondary IPs the GitLab Pages daemon
+    listens on. If you don't have IPv6, you can omit the IPv6 address.
 
 1. [Reconfigure GitLab][reconfigure]
 
@@ -194,12 +198,13 @@ world. Custom domains and TLS are supported.
     pages_nginx['enable'] = false
     gitlab_pages['cert'] = "/etc/gitlab/ssl/example.io.crt"
     gitlab_pages['cert_key'] = "/etc/gitlab/ssl/example.io.key"
-    gitlab_pages['external_http'] = '1.1.1.2:80'
-    gitlab_pages['external_https'] = '1.1.1.2:443'
+    gitlab_pages['external_http'] = ['1.1.1.2:80', '[2001::2]:80']
+    gitlab_pages['external_https'] = ['1.1.1.2:443', '[2001::2]:443']
     ```
 
     where `1.1.1.1` is the primary IP address that GitLab is listening to and
-    `1.1.1.2` the secondary IP where the GitLab Pages daemon listens to.
+    `1.1.1.2` and `2001::2` are the secondary IPs where the GitLab Pages daemon
+    listens on. If you don't have IPv6, you can omit the IPv6 address.
 
 1. [Reconfigure GitLab][reconfigure]
 

features/steps/project/pages.rb

@@ -53,13 +53,13 @@ class Spinach::Features::ProjectPages < Spinach::FeatureSteps
   end
 
   step 'pages are exposed on external HTTP address' do
-    allow(Gitlab.config.pages).to receive(:external_http).and_return('1.1.1.1:80')
+    allow(Gitlab.config.pages).to receive(:external_http).and_return(['1.1.1.1:80'])
     allow(Gitlab.config.pages).to receive(:external_https).and_return(nil)
   end
 
   step 'pages are exposed on external HTTPS address' do
-    allow(Gitlab.config.pages).to receive(:external_http).and_return('1.1.1.1:80')
-    allow(Gitlab.config.pages).to receive(:external_https).and_return('1.1.1.1:443')
+    allow(Gitlab.config.pages).to receive(:external_http).and_return(['1.1.1.1:80'])
+    allow(Gitlab.config.pages).to receive(:external_https).and_return(['1.1.1.1:443'])
   end
 
   step 'I should be able to add a New Domain' do

lib/support/init.d/gitlab.default.example

@@ -56,14 +56,14 @@ gitlab_workhorse_log="$app_root/log/gitlab-workhorse.log"
 # The value of -listen-http must be set to `gitlab.yml > pages > external_http`
 # as well. For example:
 #
-#   -listen-http 1.1.1.1:80
+#   -listen-http 1.1.1.1:80 -listen-http [2001::1]:80
 #
 # To enable HTTPS support for custom domains add the `-listen-https`,
 # `-root-cert` and `-root-key` directives in `gitlab_pages_options` below.
 # The value of -listen-https must be set to `gitlab.yml > pages > external_https`
 # as well. For example:
 #
-#   -listen-https 1.1.1.1:443 -root-cert /path/to/example.com.crt -root-key /path/to/example.com.key
+#   -listen-https 1.1.1.1:443 -listen-http [2001::1]:443 -root-cert /path/to/example.com.crt -root-key /path/to/example.com.key
 #
 # The -pages-domain must be specified the same as in `gitlab.yml > pages > host`.
 # Set `gitlab_pages_enabled=true` if you want to enable the Pages feature.