What you should know about SSH

Mi­chael W. Lu­cas pub­lished his new book “SSH Mas­tery” (no link to an on­line store, get it from your pre­ferred on­line or off­line one in your part of the world).

Do you think you know a lot about SSH? I thought I did when Mi­chael searched tech­nic­al proof-​readers for this book. I offered to have a look at his work in pro­gress and he gently ac­cep­ted (while I do not get money for this, I am one of the per­sons he thanks for  the tech­nic­al re­view in the be­gin­ning, so I am in­volved some­how and as such you should take the fol­low­ing with a grain of salt).

I already had user re­stric­tions in place be­fore the re­view, but now I nar­rowed down some re­stric­tions based upon some con­di­tion­als. I already used SSH tun­nels for vari­ous things be­fore (where leg­ally ap­plic­able), but I learned some ad­di­tion­al VPN tech­niques with SSH. I already used mul­tiple ssh-​keys for vari­ous things, but Mi­chael provides some in­ter­est­ing ways of hand­ling a large-​volume of ssh-​keys over mul­tiple ma­chines. … I really hope that my re­view was as valu­able for Mi­chael, as it was for me to do the re­view.

He ends the book with “You now know more about SSH, OpenSSH and Putty than the vast ma­jor­ity of IT pro­fes­sion­als! Con­grat­u­la­tions”, and this is true, and all that in his writ­ing style where you can come with a prob­lem, read about it, and leave with a solu­tion (nor­mally with a little bit of en­ter­tain­ment in between).

I know a lot of people which work daily with SSH, and they know only a small part of what is presen­ted in this book. In my opin­ion this book is a must-​have for every System/​Database/​Application/​Whatever Ad­min­is­trat­or in charge of some­thing on an UNIX-​like sys­tem, and even “nor­mal users” of SSH (no mat­ter if they use PuTTY, or a ssh com­mand line pro­gram on an UNIX-​like sys­tem (most prob­ably it will be OpenSSH or a clone of it)) will get some help­ful in­form­a­tion from this book.

I can only re­com­mend it.

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