1 Load Balancing & High Availability 0 Optimizing System Resources through Effective Load Balancing An IceWarp White Paper October
2 1 Background Every server is finite. Regardless of its capacity, there is a limit to how much it can process. As technology creates a more sophisticated system, the demands upon that system keep pace and even threaten to overtake it. Despite its size, classification or rank, a modern business needs effective and intelligent load balancing. This is true not merely of companies that experience sudden growth and demand immediate scalability; it is also true of moderately sized companies with smaller systems. An overworked system increases the risk of downtime, puts data at greater risk, and reduces productivity. In addition, system administrators must cope with ever more restrictive RPOs (recovery point objectives) and RTOs (recovery time objectives). Load Balancing can give smaller businesses the competitive advantage. While any information system must be appropriately backed up in the event of failure, proper load balancing can preempt any such outage. Implementing the ideal load balancing solution used to be cost prohibitive for smaller businesses. However, the solution detailed in this white paper provides better cost efficiency and gives smaller businesses the competitive advantage.
3 2 Load Balancing and Clustering with IceWarp Mail Server As illustrated in figure 1, deploying IceWarp Mail Server in a load balanced environment is the most powerful solution for high traffic performance. Figure 1 This solution is advanced and requires technical expertise to deploy. It provides a single point of entry for that is handled by a load balancer and then directed to the appropriate server. The main function of the load balancer is to direct traffic to servers with the fewest number of connections. The load balancing system can be set up for either round robin support or fail over support. Fail over directs traffic to one designated server and if that server ever goes down, the load balancer will switch the traffic to the next server in the group, within milliseconds. Load balancing can be performed with a network load balancer or by using the Microsoft Load Balancing Service. IceWarp does not recommend using Microsoft s service for high traffic solutions.
4 3 The zone file on the authoritative DNS server will need one MX (mail exchange) record for the front end connection. MX records tell mail servers where to find a domain s mail server(s). The MX record should be pushed to an IP that is set up in a system s load balancer. For load balancing, an administrator will need to designate an IP in the Microsoft Load Balancing Service, and add it to each server. IceWarp's Recommended Solution There are more load balancing scenarios than can be covered in this document; therefore, the discussion will be limited to IceWarp's recommended solution, which is a balance between increased stability and ease of management. Figure 2 illustrates a load balanced solution for up to 150,000 users or even more. Utilizing IceWarp's efficient engine, many off the shelf servers have ample processing power to house up to even a million users. The ultimate number of supported users depends upon hardware and OS specifications. This solution provides full redundancy for all data in the environment, and there should not be a single point of failure. Even if the entire infrastructure were to crash, this solution would protect all running services and stored data. Figure 2
5 4 IceWarp Server in a Load Balanced/Clustered Environment IceWarp Mail Server is one of the most scalable products on the market, moving with ease from a single server installation to one with multiple servers. The system administrator merely needs to reconfigure a few settings. In this solution, IceWarp Server utilizes Open DataBase Connectivity (ODBC) in order to connect to the database. (For alternate solutions, administrators can contact IceWarp.) ODBC is easily described as a common language for Windows applications that access databases on a network. All information regarding domain, user, groupware, and spam can be stored in database format in an SQL server, either on the same system or on a completely different server. This solution presents many benefits: It provides a single location for authentication and settings control. Recovery from hardware and server failures is made easy. It supports scalability from a single server installation to a multiple server installation, simply by pointing to the database. All servers on the system house the same information, making it accessible from any and equalizing the load. An installation does not have to utilize ODBC in order to recognize these benefits. Using IceWarp's Administration Console, an administrator can switch between Standard Mode and ODBC Mode with ease. The switch requires about 60 seconds and once IceWarp points to an ODBC source, it will authenticate information and create and populate the tables. A company can scale gracefully to suit its needs and administrators can rest easy that IceWarp Server will keep pace as the company grows. There is no need for an alternate solution once a load balanced or clustered environment is needed; IceWarp Server will adapt either to provide redundancy or to accommodate increased traffic. IceWarp Server uses the database to authenticate the users and domains for incoming , to store and retrieve groupware data, and to whitelist and blacklist information in the spam database.
6 5 The database is the core of the entire solution. Domain and user information is stored here and the tabular information instructs the server as to which is acceptable and where it should be sent. Once a message has been authenticated for delivery, the server writes the to the \IceWarp\temp\ directory, where it is held just long enough to pass through important filters, including AntiVirus, AntiSpam and Content. The two last filters that an message will pass through are the user s black list and white list, which have the final say in the delivery process. The only filter that has superseding rights is the Anti Virus system. Once the message in transit has been approved by all filters, the server writes the to the \IceWarp\mail\ directory. The directory s format will be: \IceWarp\mail\domain\user\xxxxxxxxx.tmp (POP3) or.imap for IMAP mail. The data in the \temp\ directory will then be removed, and the server records the delivery information into the event logs. When setting up a load balanced group, an administrator will need to specify where certain directories point, and set up the services to perform specific tasks. The database setup is first. The system administrator will need to create the database on a central server so that other servers can point to it. This allows all servers to access the same data. Once the databases are populated and all the servers use the same location, the administrator will need to specify where the directories go. Getting an Environment Set Up to Load Balance The system administrator will need to prepare the database and file server so that IceWarp Server can communicate with them. IceWarp recommends running the environment in a Windows domain, because of the Service Access and environmental control. Unlike stand alone networks, domains provide Central Access/Control. When supporting high visibility networks that are on the Internet, it is common practice to separate servers from one another so that the entire system will not be compromised if a single server is hijacked. This would be possible because servers in a Windows domain environment share a central authentication system and commonly have low security and domain policies. Therefore, a firewall and an intrusion detection system are advised.
7 6 In order to make the information universally accessible, the administrator should use a Domain Admin account to run the services. Using the domain makes this possible by centralizing the data. This is made easy by adjusting the settings of all servers in one domain and allowing domain policies to control access between the servers. An administrator can keep the SQL servers in their own domain or remove them from the mail and file servers. The domain account is required for two reasons. First, so that the services can access necessary files without issuing a login command, and second, so that services will not need to log onto the server every time they are rebooted or disconnected from other servers. The system administrator should enable IceWarp services via the Windows Services Manager, and then set the services to log in as a domain admin account via the Windows configuration. This provides IceWarp services with the appropriate access rights for directory shares without the use of a logon script. Thus, services will initiate the logon the moment they start. This provides a failsafe in the event that a server is rebooted or if a connection is lost. If this occurs, the server will not have to log back into the domain in order to have continued access to on the file server. Administrators can take an additional precaution by creating a domain user account and assigning the precise permissions required for the services to access the necessary files. Alternatively, the administrator can create the services as domain administrator accounts. The latter is easier, but it is up to the discretion of the system administrator. The administrator will need the following folders on the file server: Mail Spam Calendar Logs (optional; logs can be stored locally or remotely) Config Config/Server/License
8 7 Configuring IceWarp Mail Server Once a system administrator allocates the central file server and sets up the database, they will need to configure the mail servers. Installing the software is the first step: If the system runs under a domain, the administrator should go to the Windows Services and set the logon account to Domain Admin, as shown in figure 3. Figure 3 Then the administrator should open the IceWarp Administration Console and go to the [Storage] tab and choose the [Database] option, as illustrated in figure 4. Figure 4 If the administrator has not yet created the ODBC connections, they will now need to do so. In Windows, they must open the
9 8 [Administrator Tools, ODBC Sources] option and create a System DSN. Figure 5 illustrates that the created ODBC sources point to a MySQL database. The administrator will need to create an ODBC source for the accounts, groupware, and spam. Figure 5 Once the ODBC sources have been created, the administrator can return to the IceWarp Administration Console and click on the [DB Settings] button on the [Storage] tab, opening the database setup box. The ODBC connection will be established, permitting the administrator to connect with the User/Account database. The administrator will also need to create the tables so that users and domains can be stored in the database. Figure 6
10 9 The administrator will need to change the syntax and driver to fit the connecting database. [Backup Connection] will be noticeable, and can be used as another database source in case the primary database becomes unreachable. It should be noted that data does not populate this second database, so an administrator will need to replicate the primary to the secondary in order to use it. The administrator is now ready to point IceWarp directories to the folders created on the file server. The administrator will need to use the UNC path for these connections. The /temp path should always stay local to each server. Figure 7 The mailbox path option will allow the administrator to organize the mail folder in alphabetical order. Servers with large amounts of users will need to be configured with this option, in order to keep the folders/users separated as much as possible. Windows would take a longer to open one folder with 100,000 small folders, while sorting would allow Windows to easily manage the folders. As shown in figure 8, the administrator should now move to the [Load Balancing] tab and point the other folders not seen in the [Directories] tab.
11 10 Figure 8 The administrator will now need to click on the [Settings File] button in order to configure the remaining paths and options for load balancing. Some fields will already be filled out, and the administrator should press the [Comment] button to show the permitted fields. See figure 9. Figure 9 Figure 9 illustrates a file that has mapped values for each line. For example, line 1 is reserved for the config path, so only the config path can be used in line 1. This file would not be useable if the line did not specify the precise value for which it is reserved.
12 11 Most of the file is not used at this time and the administrator should have the config, spam, and calendar paths already filled out. An administrator will specify the license path on line 12. As discussed earlier, the administrator should create a license folder on the shared config folder; this is because each server in a load balanced solution requires a license. If two servers read from the same config file, each would read the same license information, causing both to shut down. The administrator can create the license folder in the shared config file or keep it local. They should then create folders for each IceWarp Server installation in the environment inside the license folder. For example: \\Load1\IceWarp\Config\License\Server1\license.key Once these folders are created, the administrator should move the license.key file from each server s local configuration to their respective folder inside of the license folder on the common file server. This will allow each server to read all settings from the shared configuration file while still isolating the respective license. On line 12, the system administrator will point to the license path for the server they are configuring. This will be the only line in the file that will be different on each server. Therefore, a 3 server installation would require that line 12 in each respective server s load balancing settings file show its own license.key file. The last tab is [Local Settings]. These will be the settings that separate the servers. The Server ID option will need to be set, for example: 01, 1a, etc. See figure 10. Figure 10
13 12 The IP binding would greatly depend on the network setup. If an administrator binds the services to a specific IP, they can place that IP here. It can run with the All Available setting or be bound to a specific IP. See figure 11. Figure 11 As shown in figure 12, the hostname would be: mx1.domain.com for one server, mx2.domain.com for the second server, and so on. Figure 12 The remaining options are recommended, though not required. The first option, [This Server Operated in Slave Mode], will allow an administrator to designate all other servers to be slaves to the primary server. This means only the primary server will deliver spam reports, perform system backups, operate remote watchdog, etc. Not all servers have to perform these actions since it can cause duplicates.
14 13 Using the second option, [Automatically check if the configuration has been changed or updated], the administrator can automate the server to verify if changes have been made, and then apply those changes. Figure 13 IceWarp Scalability In the final step, the administrator must move Anti Spam and GroupWare databases to the shared database. To do this, they should go to the [General] tab of each, click on [DB Settings], and point them to the ODBC sources and create the tables. The system is now load balanced, and as long as the servers can communicate with the database and shared folders, all data will be shared and seen across all IceWarp Server installations. The environment will now scale gracefully. The solution described herein is a simple process for an installation involving: 2 IceWarp Servers 1 database server 1 file server If needed, the database and file servers can be located on the same server.
15 14 It is easy to accommodate a business experiencing significant growth and that has too much traffic or too large a user base. The system administrator merely needs to move the database to a dedicated server and use an additional server or servers running IceWarp. IceWarp Server can be brought into the environment and be configured within minutes. After the settings described herein are replicated on the new server, all servers in the installation can share all users, domains and settings. Given the more complex process that non IceWarp installations necessitate, the IceWarp solution is by far the most practical, effective and desirable. Conclusion IceWarp Mail Server is easily deployed for any solution needed. An administrator can quickly move from a single server solution to a load balanced cluster within a few standard steps. There are a number of variables that need to be considered before making a final decision: Cost namely, initial equipment, software, bandwidth, monthly overhead, replacement hardware, etc. Technical knowledge to maintain the servers Number of users versus cost and overhead Expectation of performance versus number of servers (webmail, incoming mail, filtering, etc.) Setup is easily started from any point. Once a decision has been made, the administrator can conduct a clean install or upgrade a single server. The following are key points to be aware of when setting up the environment: All servers should be in the same domain. Administrators should set the IceWarp Services to run as a Domain Admin account. This allows the services to access the share drive on the file server without having to log into the Window operating system. One SQL server will manage all the User/Domains Authentication for all front end servers. The file server will hold central data for all the servers to access. The administrator should create a share for a space on the file server where all IceWarp files will be located. The \IceWarp\TEMP\ directory needs to stay on each server.
16 15 The \IceWarp\mail\ directory needs to be located on the File server and all servers need to point their directory for mail to this location. Afterword Deploying a load balanced network will provide stability and flexibility. An administrator can easily take a server out for maintenance, add a server to the group, reboot servers during the day, whatever is required; the environment is designed to account for servers going down and providing as close to 100% uptime as possible. Data is the heart of any venture. Small businesses must deal with many of the same data administration issues that large enterprises and ISPs face, only on a different scale. A business can achieve the competitive advantage if it is able to keep its system resource efficient, streamlined, and balanced. As with any solution, the art and science of load balancing must be approached with due deliberation. IceWarp believes that the information and instructions described herein will provide high availability.
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