How to become a wizard?

This question came up in conversation recently, I was not entirely sure of the context, was it

  • Im old ( well, retired from full time work), have grey hair (not much hair) and a grey beard
  • Ive worked with MQ since it started
  • I know quite a lot about quite a lot (but the opposite is true, there is so much I do not know about so many things in MQ)
  • I can make things disappear – that pint of beer – see after half an hour it has gone!
  • Im not afraid of going into strange places ( such as going from z/OS into linux)

If you want to be a wizard, here are some thoughts on how to get there.

GUIs are good in some situations

For example

  • One-of requests
  • for low skilled people
  • people with lots of time

My approach is

  • first time – use the GUI to understand the process
  • second time – use the GUI to understand the input
  • third time – automate it – perhaps set up a shell script with the majority of the parameters already filled in

Be brave – go and fight dragons

An easy task is to find the SSL CIPHER specs being used in a queue manager. You use runmqsc and issue dis chl(*) where(SSLCIPH,NE,”) and use your pen and paper to write down what is being used. Easy – but slow.

The dragon task – is to do this for 100 queue managers, and you have half an hour to do it! How does a dragon hunter do this on Linux?

echo “dis chl(*) sslciph” |runmqsc -c QMA | tee -a QMA.FILE

  • echo “dis chl(*) sslciph” is the command to run
  • | passes this to runmqsc
  • the -c in runmqsc means use a client to go to the remote box
  • QMA is the queue manager name (and the channel name to get there)
  • | tee passes the output to the terminal and put the output in a file called QMA.FILE

The output from this is a file QMA.FILE on your local machine with the output of the command in it. Put the echo…. command in a file, and repeat it for every queue manager, and run the file

The second bit of magic is the command

grep CIPH Q*.FILE |sort -k2,2 |uniq -c -f1

  • grep CIPH Q*.FILE this looks for the string CIPH in the files *.FILE and displays the file name and the line of data. For example
QMA.FILE:   SSLCIPH(TLS_RSA_WITH_AES_128_CBC_SHA256) 
QMA.FILE: SSLCIPH( )
QMB.FILE: SSLCIPH( )
QMB.FILE: SSLCIPH(TLS_RSA_WITH_AES_128_CBC_SHA256)
  • |sort -k2,2 says sort on the second field to the second field eg SSLCIPH(TLS_RSA_WITH_AES_128_CBC_SHA256)
  • |uniq -c -f1 display the count of unique values – skipping the first field (skipping the file name)
  • the output is

20 QMA.FILE:SSL_CIPHER_SPEC:
4 QMA.FILE:SSL_CIPHER_SPEC: TLS_RSA_WITH_AES_128_CBC_SHA256
1 QMB.FILE:SSL_CIPHER_SPEC: TLS_RSA_WITH_AES_256_GCM_SHA384

  • So there is the list of cipher spec being used and the count of them – easy !
  • To finish killing the dragon find which queue managers are using the GCM spec
  • grep TLS_RSA_WITH_AES_256_GCM_SHA384 *.FILE to show which files have that cipher spec.

If you want to become a person with good technical skills, these are the sorts of skills you need to develop

  • learn the command line interface, and learn to automate
  • explore different areas, such as shell short cuts, grep, awk, uniq
  • if the command do no damage – do not be afraid of trying something.

Good luck!

One thought on “How to become a wizard?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s