Udev and your Ethernet Interface names in a Virtual World

Udev and your Ethernet Interface names in a Virtual World

 

Have you ever cloned a VM (Virtual Machine) of either Redhat or CentOS and had your Ethernet Interface Name change on you to something other than "eth0" or "eth1" ...

 

If so even though you change /etc/sysconfig/network-scripts/ifcfg-ethXXXX and its entries to reflect your choice of name, after a reboot you still find your ethernet interface

libtoolT errors in autoconf(./configure) in tomcat connector source compile on CentOS 6 64bit

Normal run of libtool, produces no other warnings until the end of the 
master configure script.
At which point out pops:
  config.status: executing libtool commands
  /bin/rm: cannot remove `libtoolT': No such file or directory

This is resolved by placing:
  $RM -f "$cfgfile"

at line 680 of /usr/share/aclocal/libtool.m4

 

NOTE: If you already started your ./configure (autoconf) run you will need to locate the localized libtool.m4 commands in configure.status

SNPP - Simple Network Paging Protocol Resources

SMTP Gateways -

Please Note: While this protocol is popular, it was not designed for messaging and as such it is not time sensitive, there can be delays in the reciept of the email depending on the routing (this does not have anything to do with the software but the design of the protocol). If your carrier supports SNPP or WCTP we would suggest using those protocols if time is an issue!

How to Convert MB/s to IOPS

Most SSDs have two speed ratings for reading as well as for writing.  The first rating is the sustained MB/s performance, which is the main marketing most manufacturers use.  The second rating is the 4K Random IOPS performance, which gives a much better idea of how the drive will perform in the real world.  The sustained MB/s rating is the sequential transfer rate the SSD will maintain continuously, such as over a period of 30 seconds.  The 4K Random IOPS on the other hand is how many 4K (4096 byte) operations the drive will handle per second with each block being read or written to a rando

Linux Multipath Routing

I have 2 internet connections, I can configure eather one to work fine on this syetm, each comes in on a different ethernet card.


Reference Material "Linux advanced routing and traffic control HOWTO" can be found here: http://www.tldp.org/HOWTO/Adv-Routin...ple-links.html

So that now I am configured so that both networks are up at once, each one responds to ping properly.

I can then set eather networks gateway as my default gateway and have internet access.

Netscreen VLAN Configuration

Here is a basic configration on how to set the zones and interfaces up, you would still need policies and management and suchset vrouter trust-vr sharableunset vrouter "trust-vr" auto-route-exportset zone id 101 "Trust 1"set zone id 102 "Trust 2"set zone id 103 "Trust 3"set interface "ethernet1" zone "Untrust"set interface "ethernet2" zone "Trust 1"set interface "ethernet3" zone "Trust 2"set interface "ethernet4" zone "Trust 3"set interface ethernet1 ip 64.0.24.1/30set interface ethernet1 routeset interface ethernet1 gateway 64.0.24.2set interface ethernet2 ip 90.1.1.1/24set interface ether

DB2 Activity Monitoring and DB2 Snapshot from CLP and DAS server starting and stopping

Starting and stopping the DB2 administration server (DAS)

 
Prerequisites

To manually start or stop the DAS, on Windows(R) you must first log on to the computer using an account or user ID that belongs to either Administrators, Server Operators, or Power Users groups. To manually start or stop the DAS, on Unix the account or user ID must be made part of the dasadm_group. The dasadm_group is specified in the DAS configuration parameters.

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