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Special Forums UNIX and Linux Applications High Performance Computing High reliability web server - cluster, redundancy, etc Post 302301982 by bsaadmin on Sunday 29th of March 2009 04:29:48 PM
Old 03-29-2009
High reliability web server - cluster, redundancy, etc

Hi. I am IT manager/developer for a small organization. I have been doing as-needed linux server administration for several years and am by no means an expert. I've built several of my own servers, and our org is currently using hosting services for our servers and I am relatively happy.

We recently had an outage at the host, and management has made clear that this is unacceptable. Our host is one of the larger ones, a publicly traded company, and their techs are onsite and knowledgeable. The outage was a problem with the pipe between the hosting company and the backbone to the internet, caused by the hosting company's pipe provider. It lasted about 25 minutes. Just FYI.

So the conversation about redundancy and clusters has begun. I have never done this before. My hosting company offers a cluster plan that would be easy to implement (CPanel based) but that won't solve the problem of a pipe outage. We are thinking of clustered web servers (apache, php) and clustered databases (mysql) in different locations geographically. Wha are the considerations involved? Rough idea of costs, risks that remain, etc.

Any direction would be really appreciated.
 

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ftpservers(4)							   File Formats 						     ftpservers(4)

NAME
ftpservers - FTP Server virtual hosting configuration file SYNOPSIS
/etc/ftpd/ftpservers DESCRIPTION
The ftpservers file is used to configure complete virtual hosting. In contrast to limited virtual hosting, complete virtual hosting allows separate configuration files to be specified for each virtual host. The set of configuration files for each virtual host are placed in their own directory. The ftpservers file associates the address of each virtual host with the directory its configuration files are stored in. The virtual host configuration files must be named: ftpaccess Virtual host's access file ftpusers Restricts the accounts that can use the virtual host ftpgroups Virtual hosts enhanced group access file ftphosts Allow or deny usernames access to the virtual host ftpconversions Customize conversions available from the virtual host You do not need to put every file in each virtual host directory. If you want a virtual host to use the master copy of a file, then do not include it in the virtual host directory. If the file is not included, the master copy from the /etc/ftpd directory will be used. The file names must match exactly. If you misspell any of them or name them differently, the server will not find them, and the server will use the master copy instead. The ftpaddhost utility is an administrative tool to configure virtual hosts. See ftpaddhost(1M). File Format There are two fields to each entry in the ftpservers file: address directory-containing-configuration-files For example: 10.196.145.10 /etc/ftpd/virtual-ftpd/10.196.145.10 10.196.145.200 /etc/ftpd//virtual-ftpd/10.196.145.200 some.domain INTERNAL When an FTP client connects to the FTP Server, in.ftpd(1M) tries to match the IP address to which the FTP client connected with one found in the ftpservers file. The address can be an IPv4 or IPv6 address, or a hostname. If a match is found, The FTP server uses any configuration files found in the associated directory. If a match is not found, or an invalid directory path is encountered, the default paths to the configuration files are used. The use of INTERNAL in the example above fails the check for a specific directory, and the master configuration files will be used. Either the actual IP address or a specific hostname can be used to specify the virtual host. It is better to specify the actual IP of the virtual host, as it reduces the need for a domain lookup and eliminates DNS security related naming issues, for example: 10.196.145.20 /etc/ftpd/config/faqs.org/ ftp.some.domain /etc/ftpd/config/faqs.org/ Lines that begin with a # sign are treated as comment lines and are ignored. FILES
/etc/ftpd/ftpservers ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWftpr | +-----------------------------+-----------------------------+ |Interface Stability |External | +-----------------------------+-----------------------------+ SEE ALSO
ftpaddhost(1M), in.ftpd(1M), ftpaccess(4), ftpconversions(4), ftpgroups(4), ftphosts(4), ftpusers(4), attributes(5) SunOS 5.10 1 May 2003 ftpservers(4)
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