20 Linux System Monitoring Tools Every SysAdmin Should Know

20 Linux System Monitoring Tools Every SysAdmin Should Know

VMware vSwitch and Cisco switch configuration

These are field configurations that have been in-use for years and have their origin from both VMware and Cisco Best Practice documents regarding VMware integration. We use these configurations as reference when working with customer’s network teams in setting up any new Cisco network equipment for VMware.

Standard trunk port Best Practice switchport configuration:

interface GigabitEthernet#/#
description <<** ESX Host #/# **>>
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,#,#,#
switchport mode trunk
switchport nonegotiate
spanning-tree portfast trunk
exit

Standard ether-channel Best Practice switchport configuration:

IMPORTANT NOTE: Etherchannel is only applicable if all the interfaces bound to the channel are going to the same physical switch OR that all of the interfaces are going to different physical switches which are stacked together (with an actual stacking cable, not an ISL.) If you are running these interfaces to two separate network switches, you cannot Etherchannel them and they should be configured as above rather than the example below.

interface port-channel #
description <<** ESX EC# **>>
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,#,#,#
switchport mode trunk
interface GigabitEthernet#/#
description <<** EC#/INT# **>>
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,#,#,#
switchport mode trunk
channel-group # mode on
interface GigabitEthernet#/#
description <<** EC#/INT# **>>
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,#,#,#
switchport mode trunk
channel-group # mode on
exit

NOTE: It is also worth mentioning that it is assumed the member ports (those with channel-group # mode on as above) will inherit their configuration from the channel-group but it is sometimes necessary to replicate that configuration to their individual switchport configurations as above.

Capacity Planning Tools

Platespin Recon
VMware Capacity Planner
CIRBA
LANAMARK

A couple important (ALUA and SRM) notes for VMware and EMC Storage

http://virtualgeek.typepad.com/virtual_geek/2009/09/a-couple-important-alua-and-srm-notes.html

FreeBSD and multiple gateways

Question: How to add multiple gateways to a FreeBSD?
Answer: No you can not do this (at least directly) on FreeBSD. FreeBSD don't support multiple gateways.
Workaround solution: If you have a server with 2 set of IPs and each set have there own gateway.

• First, you must select one of the gateway to be a default gateway.
• Then, You need ipfw (or any FreeBSD firewall solution),
  Check that your kernel support ipfw, if not, recompile your kernel with the following options(IPDIVERT and DUMMYNET is not required, but if you add IPFW/IPFW2 it better to also add these two options)

  #Firewall & NAT & DummyNet 
  options         IPFIREWALL
  options         IPDIVERT
  options         IPFIREWALL_DEFAULT_TO_ACCEPT
  options         IPFIREWALL_VERBOSE
  options         IPFIREWALL_VERBOSE_LIMIT=100
  options         DUMMYNET
  options         IPFW2
  

  add the following rule to your ipfw rules set.

   ipfw add rule_no fwd second_gateyway_ip ip from ip_of_this_gateway to not me
  

  For example, I have 2 ip set (10.0.0.100,10.0.0.101,10.0.0.102 for gateway 10.0.0.254) and (192.168.0.77,192.168.0.78 for gateways 192.168.0.254). I chose 10.0.0.254 as the default gateway. So, my ipfw rules are

   ipfw add 100 fwd 192.168.0.254 ip from 192.168.0.77 to not me
        ipfw add 110 fwd 192.168.0.254 ip from 192.168.0.78 to not me

Source: http://freebie.miraclenet.co.th/server/

Články o administraci CISCO switchů

http://www.samuraj-cz.com/clanky-kategorie/cisco-admin/

Článek o konfiguraci CISCO a ESX teamingu
http://www.samuraj-cz.com/clanek/vmware-esxi-a-nic-teaming-aneb-pripojeni-pres-vice-sitovek/