PS_>

PowerShell and Cisco Notes

[tylerapplebaum]

When you have 4 versions of PHP on a Windows server

Hmm.. which one is active?

<?php echo 'Current PHP version: ' . phpversion(); ?>

[tylerapplebaum]

XenServer Version

[root@xenhost-dell28 ~]# more /etc/redhat-release XenServer release 7.1.1 (xenenterprise)

[tylerapplebaum]

Re-running the Ubuntu motd

admin@WEBSERVER01:/$ landscape-sysinfo  System load:  0.35               Processes:           272  Usage of /:   29.5% of 61.67GB   Users logged in:     1  Memory usage: 10%                IP address for eth0: 192.168.5.5  Swap usage:   0%                 IP address for eth1: 192.168.7.42

 => There is 1 zombie process.

 Graph this data and manage this system at:    https://landscape.canonical.com/

[tylerapplebaum]

Finishing the on-call rotation

[tylerapplebaum]

Unisys techs

[tylerapplebaum]

Running sh ip int br during an outage as a habit.

[tylerapplebaum]

Netapp Failover

[tylerapplebaum]

Project manager: I need this form filled out by Friday

Me: I don't really see anywhere in here to add information. Can you give me some detail?

Project manager: I don't know, I've never done this. I just need it.

[tylerapplebaum]

ipsec replay window

%CRYPTO-4-PKT_REPLAY_ERR decrypt: replay check failed 

This annoying-as-fuck error can indicate packet loss, though it can also be caused by bursty traffic. Let’s make the window a little bigger.

crypto ipsec security-association replay window-size 1024

[tylerapplebaum]

Get-DaysTilCCIE.ps1

Function Get-DaysTilCCIE { [CmdletBinding()]  param(  $StartDate=(Get-Date)  ) $EndDate=[datetime]"06/21/2018 00:00" $NumDays = New-Timespan -Start $StartDate -End $EndDate | Select-Object -ExpandProperty Days

Write-Host "There are " -nonewline Write-Host -Fo Green "$NumDays" -nonewline Write-Host " days until you take your CCIE exam. Go open VIRL!" }

. Get-DaysTilCCIE

There are 51 days until you take your CCIE exam. Go open VIRL!

[tylerapplebaum]

Showing up to a new datacenter to recable and wondering how it got so bad in the first place.

[tylerapplebaum]

Netflow TCP Flags

URG     ACK     PSH     RST     SYN     FIN 32      16      8       4       2       1

Common flags:

1A = SYN,ACK,PSH

18 = ACK,PSH

[tylerapplebaum]

CCIE Supplements

[tylerapplebaum]

XenServer VM List

Run this from each pool master

xe vm-list | grep -v Control | grep name-label

[tylerapplebaum]

NX-OS Error Checking

sh int fc1/1-48 | i fc|Speed|err

[tylerapplebaum]

Link to my Gists - https://gist.github.com/tylerapplebaum

[tylerapplebaum]

Create Folders by Month

Finally, a PowerShell post.

Create folders for each month with a oneliner.

ForEach ($i in 1..12) {New-Item -ItemType Directory -Path C:\Temp\$((Get-Culture).DateTimeFormat.GetMonthName($i))}

A variation with the month numbers

ForEach ($i in 1..12) {New-Item -ItemType Directory -Path "C:\Temp\$i - $((Get-Culture).DateTimeFormat.GetMonthName($i))"}