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Other than remote login, there's various useful things you can do with ssh, like running a remote command, multiplexing connections to save on server resource, setting up ssh aliases to save you some keystrokes, and so forth. Recently, when my partner logged on a recently created CentOS server hosted at Digital Ocean, he saw the following messages: Last failed login: Tue Jul 29 16:27:31 EDT 2014 from stuff2share.net on ssh:notty Clearly that wasn't us trying to log in. Obviously, there was some malicious user(s) likely trying to enter our server with brute-force attacks. We were under a ssh brute force attack. Such malicious scan is not uncommon these days. It came just a couple days after our new server was up.
I learned a few good ways to prevent this:
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 FB released Graph API 2.0 on 4/30/2014 at f8. FB has changed a lot over time and it's hard to keep up. New Facebook App developers may feel frustrating and confusing. If so, you're not along. To develop an app using FB API, before you read FB Developer Quickstart, ready this post first which is supposed to help you get prepared quickly with less confusion.
Ever suspect your Java app leaking memory but not sure which class it is potentially causing OOM?
In this post, I recommend Eclipse Memory Analyzer (MAT) for developers to analyze heap dumps so you can chase down leak suspects. MAT is much easier to use and read than stand-along jhat unix command, and while monitor memory usage using VisualVM is helpful, MAT gives you specific hints about which classes may be the suspects. It is not uncommon that you need to watch the runtime performance of a Java application on a server. In this post, I'll show you how to set up a target JVM so you can monitor its cpu, heap memory, threads usage from a specific JMX client - VisualVM. VisualVM is similar to JConsole, a JMX-compliant monitoring tool, but is more advanced.
To use a JMX client, the setup you need to do first are:
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in loving memory of my mother and my 4th aunt