I’ve never found a really simple video on what exactly Anycast is with a basic examples when exploring the concepts. I decided to lab it up and figured this might help some of you starting out with the concepts. Any comments feel free to let me know!
Config Attached for IOS lab HERE.
One recent pet gripe of mine has been having to add a new VLAN into our datacenter for our vSphere platform. Not that I trust my DCs switches with puppet just yet, this is a proof of concept post about how we could be using puppet to centrally manage this configuration and push it out across our DC.
This article is about using the Asterisk PBX and exploiting Google’s voice recognition API built for voice search in Chrome to build an address book that technology inept people (my grandmother) can use to place cheap telephone calls over VoIP.
This tool is built for my grandmother; a lady who has macular degeneration making her legally blind. She doesn’t want to invest a great deal of money in this solution or have much of a learning curve, it took long enough to get her using the two button audio book solution on the iPod. Read more »
So lately I’ve been thinking about my backup strategy on my Mac. From previous posts you might know I’ve build my OpenIndiana ZFS FileServer. Well, just created a volume and decided to put 300GB to good use to create a time machine on my mac. There is a brilliant guide on how to do it here and suggest you all take a look (Thanks for the awesome guide Marco).
Just finishing off a few things at work this week. We’ve got a few sites around the place where we have HA internet powered by two Juniper SRX100′s. The Two SRX100′s operate in a Chassis Cluster and peer with our ISP using BGP across both active/passive devices.
This script is a little Nagios check script that I wrote to hook into our in-house Nagios monitoring platform. It makes sure the chassis cluster has not failed over operating in a degraded state, and makes sure that there are two BGP peers connected.
NOTE: I was aiming for simplicity in this setup, if you’ve got a bigger environment or require instant notifications you might wish to set up snmp traps to get instant notifications.
#!/bin/bash
# Bash script to check the status of a SRX cluster.
# Works by SSHing into cluster to check "show chassis cluster status" command and SNMP walking to make sure BGP peers
# are both in a connected state
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
clusterAddress=$1
privateKey=$2
clusterStatus=`ssh nagios@$clusterAddress -i $privateKey "show chassis cluster status"`
declare -i primaryCount
declare -i secondaryCount
declare -i failoverCount
declare -i activeBgpPeers
activeBgpPeers=`snmpwalk -Os -c public -v 1 $clusterAddress .1.3.6.1.2.1.15.3.1.2 | grep "INTEGER: 6" | wc -l`
primaryCount=`echo "$clusterStatus" | grep primary | wc -l`
secondaryCount=`echo "$clusterStatus" | grep secondary | wc -l`
failoverCount=`echo "$clusterStatus" | grep "Failover count: 0" | wc -l`
if [ $primaryCount -ne 2 ]
then
echo "No two primary redundancy groups"
echo "$clusterStatus"
exit $STATE_CRITICAL
fi
if [ $secondaryCount -ne 2 ]
then
echo "No two secondary redundancy groups"
echo "$clusterStatus"
exit $STATE_CRITICAL
fi
if [ $failoverCount -ne 2 ]
then
echo "SRX has fallen over on a redundancy group"
echo "$clusterStatus"
exit $STATE_WARNING
fi
if [ $activeBgpPeers -ne 2 ]
then
echo "NOT 2 Active BGP Peers"
exit $STATE_CRITICAL
fi
echo "OK, 2 peers. OK: Chassis Cluster status OK"
echo "$clusterStatus"
exit $STATE_OK
