How to compile HAProxy from source and setup a basic configuration. To learn more about HAProxy I decided to compile it from source and use it to load balance traffic to louwrentius. I run HAProxy on a VPS based on Ubuntu 1. LTS. Lets dive right in. First, we need to download the source. Dont copypased the exact code, you should download the latest version of HAProxy. Before you can compile software, you must make sure you have a working build environment. With Ubuntu or Debian, you should run apt get install build essential. If you open the README file in the root directory, you will find some detailed instructions on how to compile HAProxy, which is really straight forward. Compiling HAProxy. Best CPU performance. The manual states that by default, it will compile HAProxy with no CPU specific optimisations. AuPSpCPL34/ToiI9uY3Z2I/AAAAAAAAAww/DjQtxPevEn0/s1600/haproxy-initial.png' alt='Installing Haproxy On Windows' title='Installing Haproxy On Windows' />Opensource TCPHTTP loadbalancing proxy server supporting native SSL, keepalive, compression, CLI sticktables, custom log formats, header rewriting, redirects. In this blog, well provide a comparison between MySQL vs. MariaDB including Percona Server for MySQL. Introduction. The goal of this blog post is to evaluate, at. A web site about system administration tasks. Er Diagram For Airline Reservation System Pdf. Windows, Unix, SQL, VMware, Openview, Linux resources, technical articles, tips, tricks and solutions. VB. NET Free source code and tutorials for Software developers and Architects. Updated. FART or Find And Replace Text command line utility is a Windows improved version of the wellknown grep command, with advanced features such as caseadaption. Upgrading from AD FS on Windows Server 2012 R2 AD FS 3 is a relatively straightforward procedure, which can be completed easily using the AD FS installation and. To enable CPU specific optimisations, you need to use the native option. The extra argument we are supplying to make wil be CPUnative. Load_balancing.jpg' alt='Installing Haproxy On Windows' title='Installing Haproxy On Windows' />Libpcre support. It recommends to compile HAproxy with libpcre as it provides way better performance than other libc PCRE implementations. You need to install libpcre like this apt get install libpcre. The extra argument we are supplying to make wil be USEPCRE1. Splicing support. Installing Haproxy On Windows' title='Installing Haproxy On Windows' />A Linux specific feature is support for the splice system call. This system call allows data to be moved between file descriptors within kernel space, not touching user space. It entirely depends on your setup if this feature will be of any use to you. As splicing can be disabled within the configuration file of HAProxy, I would recommend compiling HAProxy with support for splicing. The extra argument we are supplying to make wil be USELINUXSPLICE1. Transparent mode support. I learned that HAProxy also supports a transparent mode where it seems to spoof the client IP address to the backend servers. This way, the backend servers see the actual client IP address, not the IP address of the HAProxy load balancers. For this setup to work, you need additional firewall rules and meet some routing requirements. Im not sure why this would be important and the linked article also mentions a work around where an additional HTTP header is used x forwarded for. I found this article about how to configure lighttpd to log the x forwarded for header. Here are some instructions for Ngnix. The extra argument we are supplying to make wil be USELINUXTPROXY1. Encrypted password support. Its possible to limit access to HAProxy features like statistics to specific users and their passwords. These passwords can be stored in plain text or as a more secure hash of the password, using crypt. The extra argument we are supplying to make wil be USELIBCRYPT1. Compiling HAproxy. If we would use all discussed options, our Make command would look like this make TARGETcustom CPUnative USEPCRE1 USELIBCRYPT1 USELINUXSPLICE1 USELINUXTPROXY1. Installing HAproxy. By default, HAProxy is installed in usrlocalhaproxy with the following command make install. If you want to start HAProxy at boot time, you need a startup script. HAProxy does provide a startup script for Redhat based distros, but not for Debian based distros. HAProxy is also available pre compiled as an Ubuntu or Debian package. Citavi 3 Serial on this page. These packages also contain a startup script. I used such a script and modified it to work with the HAProxy version I compiled from source. Basically, I only altered some paths, but you can find it here. Configuration. HAProxy is very versatile and the actual configuration will entirely depend on your specific needs. I will document some basic scenarios with some examples. HAProxy has many configuration options, but dont worry, those are often well documented. Scenario 1 Load balancing. In this scenario, we have one load balancer based on HAProxy and its goal is to load balance traffic across two backend HTTP servers. Reading the global section, we learn that HAProxy should run as a daemon, that it should run as a specific system user and thus drop all privileges after startup. It also should chroot to homehaproxy, a directory which should be empty and not writable by the HAProxy user or group. HAProxy will permit at most 2. The defaults section learns us that we are running in HTTP mode. HAProxy can load balance any TCP traffic. In HTTP mode, it can understand and read HTTP header information and apply different actions, allowing for more control. Now we encounter the interesting part. The defaultbackend keyword shows that all traffic entering on TCP port 8. The backend section contains the actual backend servers that will be able to handle traffic. The load balancing algorithm used is round robin every web server is used in turn. Visitor 1 hits webserver 1. Visitor 2 hits webserver 2. Visitor 3 hits webserver 1, and so on. Scenario 2 Fail over. In scenario 1, we only discussed load balancing. However, if one of the servers becomes unavailable, users will be facing error messages generated by HAProxy. This is often undesired, we want HAProxy to check the status of the backend servers and direct traffic only to servers that are available. HAProxy should not forward clients to backend servers that are not responsive. This desired behaviour requires a few extra options within the backend section. This configration makes HAProxy check both backend webservers for every 4. By default, HAProxy only tests if its possible to make a TCP connection with the webserver. Ofcourse, this will not always tell you if a webserver is properly operational. This is why option httpchk is added to the configuration. HAProxy will then connect to the backend webserver and issue an HTTP OPTIONS request, which will be a better gauge to determine if the web server service is active. With additional options you can make HAProxy request specific URIs. Additional configuration options. Logging. HAProxy supports logging to Syslog. You can configure it to log to the local syslog daemon, or to a centralised log server. All log messages are prefixed with haproxy. They are sent to localhost and the verbosity is debug. Option httplog clf makes HAProxy log in a similar log format as Apache. A tool like AWstats can then easily parse the log and generate some statistics. The backend section will only log messages related to the availability of backend servers. Actual request logging is performed through the frontent section. Prioritising backend servers. Some backend servers may have more performance and bandwidth available then others. Using the weight parameter, you can make sure that certain services get more traffic then others. In this example, webserver ws. But the load will still be balanced across both webservers. Enabling statistics. HAProxy has a build in webpage that shows performance metrics and the status of backend hosts. This webpage is not enabled by default. Please note that with this configuration, the statistics page may be accessible from the internet. As the page may provide some information about your environment that could be of benefit to attackers, its wise to configure strong passwords and to configure a uri that is not easy to predictguess. Beware that the password is transmitted in clear text For security reasons I would recommend to have the statistics page only accessible from within your own network and not accessible directly from the internet in any way. Connecting to the Windows Internal Database MICROSOFTSSEE Networking How Tos. If you are running a Windows 2. Windows Internal Database Sometimes referred to as SQL Server Embedded Edition, or see a reference to a database called MICROSOFTSSEE and be wondering what it actually is, and how can you connect to it. This how to article describes both. The Windows Internal Database is a varient of Microsoft SQL Server Express 2. Windows Server 2. Windows Server 2. R2. It is also included in Windows Sharepoint 3. Windows Server Update Services WSUS 3. Microsoft SQL Server may not be available. Other services can also use this database engine if needed, such as Active Directory Rights Managements Services, and Windows System Resource Manager. Once the Windows Internal Database has been installed, it cant be uninstalled via the addremove features wizard it appears greyed out, so you cant de select it. Windows Internal Database currently only comes as a 3. C Program Files x. Microsoft SQL Server by default. The tool used to connect to the Windows Internal Database is the same as used for the full version and express editions of Microsoft SQL Server, which is the SQL Server Management Studio or SQL Server Management Studio Express. The main thing to note with the Windows Internal Database, is the fact that you cant make remote connections to the database. It is designed so that only the computer that has it installed, can access the databases. As such, the only connection method you can use to connect to a Windows Internal Database, is to use the Named Pipes protocol. When connecting to a Windows Internal Database, you must used the fairly obscure named pipes syntax, which will be listed below, as the serverinstance name in SQL Server Management Studio. The serverinstance name to connect to is. MSSQLMICROSOFTSSEEsqlquery. You must also use Windows Authentication as the authentication method to connect to this database. If you get the following message stating that you cannot connect to. MSSQLMICROSOFTSSEEsqlquery, continue reading for a possible solution. One of the main issues you will have with connecting to the Windows Internal Database, is with authenticating. You generally need to connect to the database instance using the same windows login that was used to install the database service. If you have logged into the Windows server as an administrator, you may find that you need to run the SQL Server Management Studio application by first right clicking the shortcut, and selecting Run as Administrator. Even if your account has admin rights on the server, it still may be necessary to perform this step. You should now be able to make changes to the databases options, perform backups, etc.