basic sysadmin troubleshooting part 2
top
You’ll probably want to learn some basic top commands. E.g. hit “1″ to see the CPU break-out. Hit “z” to highlight processes that are in state “R”. Hit “O, n” to sort by memory usage. Hit “u” to type in a particular user name. “c” to see full command lines. 15 Practical Linux Top Command Examplesps
You’ll probably want to learn some basic ps switches. “ps -ef” for a listing that gives you users and commands. “ps auxf” that also adds some CPU and memory information for the processes and shows them as a “forest”. “ps -efL” also shows you threads for multi-threaded processes. “man ps” will tell you way more than you want to know. Another more useful example: ps -eo pmem,pcpu,rss,vsize,args|sort -k 1 -r -n|head
iostat
Iostat will show you some information about the I/O subsystem. I like “iostat -k 5″; it’ll show you updates in kilobytes and 5s increments. The very first screen will show averages since boot, subsequent screens only information over the last 5 seconds. Add “-x” to see information about queue lengths and average request size as well as “service time”, i.e. latency of I/O processing.
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