System requirements

• A Google Apps domain running Google Apps for Work, Education, Government, or Android for Work. 
• Access to a Google Apps super administrator account to authorize GADS.
• API access on your Google Apps domain. For more detail on the APIs required for GADS, see Prepare Google Apps for synchronization.

• A server to run GADS with one of the following operating systems:
  • Microsoft Windows^® (supported on XP, Windows 7, Windows 8, Windows Server 2003/2008/2012).
  • Linux^®—If you’re using a 32-bit version of GADS on a 64-bit Linux system, a 32-bit libc (such as libc6-i386) must be installed.
• At least 5 GB of disk space for log files and data. If you are running with the DEBUG or INFO level of logging, you may need more free space than this for additional log data.
• At least 256 MB of free RAM. However, if you have less than 10,000 users, it is recommended that you allocate at least 1 GB of free RAM. If you have more than 10,000 users, you should allocate at least 2 GB of free RAM. For very large organizations (over 250,000 users), further tuning may be needed.
• An LDAP server with user information that is accessible to GADS. All versions of LDAP are supported.
• Network access to your LDAP server. You do not need to run GADS on your LDAP server.
• Read and execute administrative access over the appropriate organizational unit structure of the LDAP server.
• An LDAP browser that can read and browse your LDAP directory server data.
• Network access to the Google Apps domain through HTTPS, directly or through a proxy server. This includes ports 80 and 443.
• For best results, a network connection to Google Apps with no proxies or firewalls is recommended.
• (Optional) A mail server able to accept and relay notifications from GADS.
• Access to Secure Sockets Layer (SSL) certificate authorities for your network.

Depending on your configuration, you may need the following levels of expertise to implement GADS:

• Google Apps administrator access and familiarity with the Google admin console.
• LDAP administrator access to your directory server and familiarity with its contents as well as familiarity with the LDAP query language.
• Network administrator privileges and familiarity with your network and security settings for internal and outbound traffic.
• (Optional) Access to a mail server that is able to relay messages for GADS notifications and familiarity with setting up mail servers for traffic.
• Human Resources contact and familiarity with your user base as well as the ability to identify which LDAP entries represent current employees.