Leveraging Liferay's Multi-Site Capabilities

As stated in chapter 1, a site is a set of pages that can be used to publish content or applications. Sites can be independent or they can be associated with an organization and serve as the website for that organization. With Liferay, you can create as many different sites as you like within the context of a single portal.

You can use sites in Liferay to build many different kinds of websites. Whether you’re building a large corporate website, a company intranet, or a small site designed to facilitate collaboration among team members, Liferay’s framework provides all the tools you need. To support different kinds of collaboration and social scenarios, Liferay’s sites provide three membership types:

  • Open: Users can become members of the site at any time. Users can join sites from the My Sites portlet.

  • Restricted: Users can request site membership but site administrators must approve requests in order for users to become members. Requests can be made from the My Sites portlet.

  • Private: Users are not allowed to join the site or request site membership. Private sites don’t appear in the My Sites portlet. Site administrators can still manually select users and assign them as site members.

In addition to these memberships, when a site is associated with an organization, all the users of that organization are automatically considered members of the site.

Members of a site can be given additional privileges within the site by using Liferay’s permission settings. It is also possible to assign different roles within the site to different members. This can be done through site roles which are defined equally for all sites or teams which are unique for each site.

Liferay’s sites have two categories of pages called page sets. There are two kinds of page sets: public pages and private pages. A site can have only public pages, only private pages or both. Private pages can only be accessed by site members. Public pages can be accessed by anyone, including users who haven’t logged in. It’s possible to restrict access to pages at the page set level or at the level of individual pages through the permission system. Public pages and private pages have different URLs and can have different content, applications, themes, and layouts.

Building a corporate Intranet provides a typical use case for Liferay sites. A corporate Intranet could have sites for all the organizations in the company: Sales, Marketing, Information Technology, Human Resources and so on. But what about the corporate health and fitness center? That’s something everybody in the company, regardless of organization, may want to join. This makes it a good candidate for an open and independent site. Similarly, the home page for a corporate intranet should probably be placed in an open independent site so any member of the portal can access it.

For other kinds of web sites, you may want to use independent sites to bring people together who share a common interest. If you were building a photo sharing web site, you might have independent sites based on the types of photos people want to share. For example, those who enjoy taking pictures of landscapes could join a Landscapes site and those who enjoy taking pictures of sunsets could join a Sunsets site.

Liferay always provides one default site, which is also known as the main site of the portal. This site does not have its own name but rather takes the name of the portal. By default the portal name is liferay.com but this value can be changed through the simple configuration of the setup wizard. The portal name can also be changed at any time through the Control Panel within Portal Settings.

Sites can be created through the Control Panel by a portal administrator. To add a site, click on Sites under the Portal section of the Control Panel and then click Add. If there is at least one site template available, a dropdown menu appears. Site templates provide a preconfigured set of pages, portlet applications, and content that can be used as the basis of a site’s public or private page set. To create a site from scratch, select Blank Site. Otherwise, select the name of the site template you’d like to use. If you opt to create a site from a site template, you have to choose whether to copy the site template’s pages as your new site’s public or private page set. If other site templates are created, they will appear in the Add menu as they become available. The following figure shows the form that needs to be filled when creating a Blank Site.

Figure 3.9: Adding a Site

Figure 3.9: Adding a Site

Name: is the name of the site you wish to create.

Description: describes the site’s intended function.

Membership Type: can be open, restricted or private. An open site appears in the My Sites portlet and users can join and leave the site whenever they want. A restricted site is the same except users must request membership. A site administrator must then explicitly grant or deny users’ requests to join. A private site does not appear in the My Sites portlet and users must be added to it manually by a site administrator.

Active: determines whether a site is active or inactive. Inactive sites are inaccessible but can be activated whenever a site administrator wishes.

Once you’ve created a site, it appears in the Sites page of the Control Panel. Once the site has been created you can specify more details about the site using three categories: Basic Information, Search Engine Optimization and Advanced.

Figure 3.10: Editing a Site

Figure 3.10: Editing a Site

Details: lets you edit the information you entered when you created the site and allows you to choose a site template for the public or private pages of your site. If you select a site template, leave the Enable propagation of changes from the site template box checked to automatically update your site if the associated site template changes. The update will only be done to pages which have not been changed within the specific site. If you uncheck this box but recheck it later, the template pages are then reapplied to your site, overwriting any changes that may have been made. Only users who have the permission “Unlink Site Template” will be able to disable the propagation of changes. When the propagation is enabled, the site template might prevent modification of some or all pages to ensure the propagation occurs.

Categorization: allows you to apply categories and tags to the site.

Site URL: lets you set friendly URLs and virtual hosts for your web site.

Site Template: provides additional information about the site template associated to the pages of the site (if any).

Sitemap: lets you use the sitemap protocol to notify search engines your web site is available for crawling.

Robots: lets you use a robots.txt file to specify certain pages and links you don’t want to be indexed by search engines. You need to set a virtual host before you set a robots.txt file.

Staging: lets you turn on either Local Live staging or Remote Live staging. To enable staging, the Enable propagation of changes from the site template box on the Details tab must be unchecked. With staging enabled, changes to the site template are automatically propagated to the staged site, not to the live site. The changes still must be approved before the site is published to live.

Analytics: lets you set a Google Analytics ID that is used for your site.

When creating a site from a site template, the initial form provides a new option that lets you decide if you want to copy the pages from the template as public pages or as private pages. By default, the site is linked to the site template and changes to the site template propagate to any site based on it. A checkbox appears that allows users to unlink the site template if the user has permission to do so.

Figure 3.11: When creating a site from a site template, you need to choose whether the site template should be copied into the sites public pages or private pages.

Figure 3.11: When creating a site from a site template, you need to choose whether the site template should be copied into the site's public pages or private pages.

Site templates are a powerful tool for managing many similar sites. Let’s examine how they work.

« Advanced Content with Structures and TemplatesUsing Site Templates »
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