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seanxwang.com

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Practical journey with a changing IP networking industry, in the age of cloud and virtualization.

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bits and bytes | seanxwang.com Reviews
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DESCRIPTION
Practical journey with a changing IP networking industry, in the age of cloud and virtualization.
<META>
KEYWORDS
1 bits and bytes
2 crontab –
3 home/ec2 user/monkey sh
4 dev/null 2 &1
5 posted by sean
6 no comments
7 labels automation
8 cron
9 crontab
10 linux
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bits and bytes,crontab –,home/ec2 user/monkey sh,dev/null 2 &1,posted by sean,no comments,labels automation,cron,crontab,linux,proxy,parameters {,keypairname {,default ***,windowinstancesubnet {,default subnet ***,windowinstancesgs {,mappings {
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bits and bytes | seanxwang.com Reviews

https://seanxwang.com

Practical journey with a changing IP networking industry, in the age of cloud and virtualization.

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1

bits and bytes: AWS hybrid cloud – shared customer gateway to multiple VPCs

http://www.seanxwang.com/2013/12/aws-hybrid-cloud-shared-customer.html

Sean X Wang, CCIE-7360, AWS-ASA-2574. Sunday, December 8, 2013. AWS hybrid cloud – shared customer gateway to multiple VPCs. Clearly, it is desirable to have a redundant pair of Customer Gateways to terminate multiple VPN connections to multiple VPCs. Having dedicated gateway to each VPC is neither scalable nor cost efficient. Automation will be impossible if new hardware is required each time a new VPC is created. In this AWS guide. A couple of workarounds are suggested to support connecting a single cu...

2

bits and bytes: Cisco Flow Control with NetApp NAS

http://www.seanxwang.com/2011/03/cisco-flow-control-with-netapp-nas.html

Sean X Wang, CCIE-7360, AWS-ASA-2574. Sunday, March 6, 2011. Cisco Flow Control with NetApp NAS. Update Nov 2012: Thanks for the comment, Paul. I have added an update with another look at flow control. When NAS is used with virtualization, performance and throughput are potential concerns. Enabling jumbo has proven to be the most effective method. Flow control, on the other hand, is not always easily agreeable by all parties. NetApp has a one paragraph “ best practice. Nexus5k# show interface e2/7. Accor...

3

bits and bytes: ERSPAN with Nexus 1000v in a Virtualized Data Center

http://www.seanxwang.com/2011/09/erspan-with-nexus-1000v-in-virtualized.html

Sean X Wang, CCIE-7360, AWS-ASA-2574. Tuesday, September 13, 2011. ERSPAN with Nexus 1000v in a Virtualized Data Center. Encapsulated remote SPAN, or ERSPAN can be used to monitor traffic remotely. In a Nexus 1000v environment, it is not feasible to attach probe directly to the virtual switch. Therefore it is particularly valuable to monitor host traffic using ERSPAN, by routing monitored traffic through IP network to designated network analyzer. Nexus1000v with specific port profile and SPAN session.

4

bits and bytes: Understand Bridge Assurance

http://www.seanxwang.com/2010/06/understand-bridge-assurance.html

Sean X Wang, CCIE-7360, AWS-ASA-2574. Thursday, June 10, 2010. Bridge assurance comes up often in Nexus troubleshooting. Therefore it is important to understand its design and effect. What is BA? It is a Cisco STP enhancement feature designed to prevent loops, by making sure that a neighboring switch does not malfunction and begin forwarding frames when it shouldn't. Configured incorrectly, BA will likely cause some headaches. Now it will make sense to highlight the important characteristics of BA:.

5

bits and bytes: Spanning tree in a Nexus virtualized data center

http://www.seanxwang.com/2011/02/spanning-tree-in-nexus-virtualized-data.html

Sean X Wang, CCIE-7360, AWS-ASA-2574. Saturday, February 12, 2011. Spanning tree in a Nexus virtualized data center. Nexus VPC reduces the reliance on Spanning Tree in a data center design, and improves link utilization and load sharing. However, spanning tree is still a necessary component of the design, often seemingly more complex, due to various options available, and connection to third party devices. There was an earlier post. Click to see larger image. Nexus 7000 VPC peer link and non-VPC link.

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Sean X Wang, CCIE-7360, AWS-ASA-2574. Saturday, July 25, 2015. AWS automation – lessons with Cron set up. I have some “monkey” jobs, which are Python scripts that runs from servers in AWS. To perform regular monitoring, generate custom CloudWatch metric, and raise alarms via SNS, Cron seems like a natural method. I’ve tried a number of things with no success, including running Cron as root, even rebuilding server. Finally, I got back on track by focusing on getting more output from the job. Use the f...

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