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Linux Networking - VLANs & Multiple IP's

 
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Old 10-08-2014
Linux Networking - VLANs & Multiple IP's
In a "typical" data centre environment (telco, financial services etc), would a Linux OS typically have one IP address connected to one VLAN or would it have many IPs and/or VLANs. I say "Linux OS" as I'm referring to an instance of the OS not necessarily a Host or server. Think Linux OS = VM in a virtualisation context. Its common for a server/host to have many IP's and possibly in different VLANs but would an OS (VM) within that host typically just have one IP in one VLAN?

I'm asking because of an ongoing debate with a Network team that wants different IP's and VLANs per Linux OS and have us put for example ssh onto one IP, and then server traffic (e.g. HTTP) onto another IP in order to separate traffic. Is this kind of thing common in a modern data centre or not? When would one go that approach vs just putting the OS onto the VLAN thats "most representative" of its function: E.g. web proxy in DMZ VLAN, App server in Backend VLAN etc etc.
 
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LEARN ABOUT HPUX

cm

cm(5)								File Formats Manual							     cm(5)

NAME

       cm - cluster monitor for high availability clusters

   Remarks
       Cluster	operations require the installation of the optional Serviceguard or Serviceguard Extension for RAC software, which is not included
       in the standard HP-UX operating system.

DESCRIPTION

       Serviceguard and Serviceguard Extension for RAC are high availability products which provide an environment such that after a failure of  a
       node,  services	(applications)	can be up and running again on another node within a very short amount of time.  In addition, Serviceguard
       Extension for RAC is the enabling software for the Real Application Clusters (RAC).  Working with the basic Serviceguard product,  Service-
       guard Extension for Faster Failover allows configuration of clusters for optimized failover.

   Commands
       The following set of commands is used to configure a high availability cluster:

		     cmquerycl(1M)
		     cmmakepkg(1M)
		     cmcheckconf(1M)
		     cmapplyconf(1M)

       The following commands are used to run or halt a cluster:

		     cmruncl(1M)
		     cmhaltcl(1M)
		     cmrunnode(1M)
		     cmhaltnode(1M)
		     cmviewcl(1M)

       Once a cluster is formed, the following commands are provided for manual operation on high availability packages:

		     cmrunpkg(1M)
		     cmhaltpkg(1M)
		     cmmodpkg(1M)

       The following commands are used within a package control script to control the services and networks configured for a package:

		     cmrunserv(1M)
		     cmhaltserv(1M)
		     cmmodnet(1M)

       A command is provided to aid in migrating from a SwitchOver/UX configuration to a Serviceguard cluster:

		     cmmigrate(1M)

       This command is not applicable with Serviceguard Extension for RAC.

SEE ALSO

       Managing Serviceguard.
       Configuring RAC Clusters with Serviceguard Extension for RAC.

						      Requires Optional Serviceguard Software						     cm(5)