Find any E-Mail Address or Proxy Address In Active Directory

Who has this e-mail address? The address could be one of many different types of objects. A user mailbox, shared mailbox, distribution list, public folder, contact or resource could all contain that specific e-mail address. The problem with the Exchange Management Console in Exchange 2010 does not allow you to find any e-mail address only the primary.

Exchange Commandlets:

1: The following Exchange commandlet is the easiest method to find a specific e-mail address
or portion of an e-mail address. This will find any object within Exchange that has an exact
match to the e-mail address you place in the filter with -eq or email portion when using -like.

Get-Recipient [email protected]

Get-Recipient -Filter {EmailAddresses -like "*emailportion*"}

2: The following examples highlight the individual commandlets that target and return the
specific Exchange object types. You can substitute -eq with -like to include wild cards.

Get-Mailbox -Filter {EmailAddresses -eq "[email protected]" -or WindowsEmailAddress -eq "[email protected]"}

Get-MailboxContact -Filter {EmailAddresses -eq "[email protected]" -or WindowsEmailAddress -eq "[email protected]"}

Get-DistributionGroup -Filter {EmailAddresses -eq "[email protected]" -or WindowsEmailAddress -eq "[email protected]"}

Get-MailUser -Filter {EmailAddresses -eq "[email protected]" -or WindowsEmailAddress -eq "[email protected]"}

Reference:
http://powershellblogger.com/2015/10/find-any-e-mail-address-or-proxy-address-in-active-directory/

 

LSOF Utility and Commands

The lsof command is very handy and all Linux/Unix sysadmins should know abouyt it and make more use of it, here are some further details and examples.

(From Wikipedia) – lsof is a command meaning “list open files”, which is used in many Unix-like systems to report a list of all open files and the processes that opened them. This open source utility was developed and supported by Victor A. Abell, the retired Associate Director of the Purdue University Computing Center. It works in and supports several Unix flavors.

Useful Commands:

List all network connections:

 sudo lsof -i 

SSH:

sudo lsof -i:22
sudo lsof -c ssh

List all network files in use by a specific process:

 sudo lsof -i -a -p 1278 

List processes which are listening on a particular port:

 sudo lsof -i :25 

List all TCP or UDP connections:

 sudo lsof -i tcp; lsof -i udp; 

List processes which opened a specific file:

 lsof /var/log/syslog 

List opened files under a directory:

 lsof +D /var/log/ 

List opened files based on process names starting with:

 lsof -c ssh -c init 

List processes using a mount point:

 sudo lsof /home 

List files opened by a specific user:

 lsof -u keith 

What commands is user Keith using:

 sudo lsof -i -u keith 

List all open files by a specific process:

 lsof -p 1278 

Kill all process that belongs to a particular user:

 kill -9 `lsof -t -u keith` 

 

SSL Server Test

Qualys SSL Server Test is free online service that performs a deep analysis of the configuration of any SSL web server on the public Internet.

https://www.ssllabs.com/ssltest/

To configure Apache and Nginx with acceptable protocols TLS settings follow these guides, they will provide a better score on the above Qualys rating and make your SSL site more secure.

 

Snapcraft

Package any app for any Linux desktop, server, cloud or device.

A ‘snap’ is a universal Linux package

Snaps work on any distribution or device. Snaps are faster to install, easier to create, safer to run, and they update automatically and transactionally so your app is always fresh and never broken.

The public collection of snaps includes the latest and best apps from GitHub and beyond, so you have the whole world of Linux apps at your fingertips. Take the tour below to experience ‘hello world’ as a snap, or jump to the developer guide to create your own snaps.

Reference: http://snapcraft.io/

netdata real-time performance monitoring for Linux

Netdata is a real-time performance monitoring solution.

Unlike other solutions that are only capable of presenting statistics of past performance, netdata is designed to be perfect for real-time performance troubleshooting.

Netdata is a linux daemon you run, which collects data in realtime (per second) and presents a web site to view and analyze them. The presentation is also real-time and full of interactive charts that precisely render all collected values.

Netdata has been designed to be installed on every system, without disrupting the applications running on it:

  • It will just use some spare CPU cycles (check Performance).
  • It will use the memory you want it have (check Memory Requirements).
  • Once started and while running, it does not use any disk I/O, apart its logging (check Log Files). Of course it saves its DB to disk when it exits and loads it back when it starts.
  • You can use it to monitor all your systems and applications. It will run on Linux PCs, servers or embedded devices.

Out of the box, it comes with plugins that collect key system metrics and metrics of popular applications.

Available here: https://github.com/firehol/netdata

Midnight Commander file size format

When dealing with large files in MC, I have difficulties counting the digits to get the order of magnitude of the file size (hundreds of MB, or tens of GB, etc.). Sometimes, I use the trick to press insert key, which highlights the file and shows the file size in a nicely formatted way (i.e. 123,456,789), which makes it a thousand times more readable.

You can modify the configuration:

You can adjust the displayed digits with the column size option, see the “Listing mode” section in the manual. The file to edit is ~/.config/mc/panels.ini.

To list the file sizes as K, M or G use a narrow size column using the user_format key:

[New Left Panel]
user_format=half type name mark size:4 space mtime

Docker Cheat Sheet

With Docker, developers can build any app in any language using any toolchain. “Dockerized” apps are completely portable and can run anywhere – colleagues’ OS X and Windows laptops, QA servers running Ubuntu in the cloud, and production data center VMs running Red Hat.

Developers can get going quickly by starting with one of the 13,000+ apps available on Docker Hub. Docker manages and tracks changes and dependencies, making it easier for sysadmins to understand how the apps that developers build work. And with Docker Hub, developers can automate their build pipeline and share artifacts with collaborators through public or private repositories.

Docker helps developers build and ship higher-quality applications, faster.” — What is Docker

https://github.com/wsargent/docker-cheat-sheet

Useful Docker Commands:
http://www.greenreedtech.com/useful-docker-commands/

400+ Free Resources for DevOps & Sysadmins

In 2014 Google indexed 200 Terabytes of data (1 T of data is equal to 1024 GB, to give you some perspective). And, it’s estimated that Google’s 200 TB is just .004% of the entire internet. Basically the internet is a big place with unlimited information.

So in an effort to decrease searching and increase developing, Morpheus Data published this massive list of free resources for DevOps engineers and System Admins, or really anyone wanting to build something useful out of the internet.

All these resources are free, or offer some kind of free/trial tier. You can use any/all of these tools personally, as a company, or even suggest improvements (in the comments). It’s up to you.

If you find this list useful, please share it with your DevOps/SysAdmin friends on your favorite social network, or visit Morpheus Data to learn how you can 4x your application deployment.

http://www.nextbigwhat.com/devops-sysadmin-tools-resources-297/?_utm_source=1-2-2

ls-httpd

ls-httpd utility for WebServer Logs is very handy.

ls-httpd type count|time [log_file]
  • ls-httpd url 1000
    will find top URLs in the last 1000 access log entries
  • ls-httpd ip 1000
    will find top IPs in the last 1000 access log entries
  • ls-httpd agent 1000
    will find top user agents in the last 1000 access log entries
  • ls-httpd url 17:
    will find top URLs from 17:00:00 to 17:59:59
  • ls-httpd url 17:2
    will find top URLs from 17:20:00 to 17:29:59
  • ls-httpd url 17
    will find top URLs in the last 17 access log entries 🙂

Reference and Download:
https://github.com/zyxware/misc-utils/blob/master/ls-httpd/ls-httpd