Debugging

spartan1 · 06-07-2018, 12:20 AM

using cli how to debug unknown performance issue on a single host?

pan64 · 06-07-2018, 01:33 AM

most probably by executing some commands....

Can you please give us some details? for example the OS, the host and a few words about that "unknown performance issue".

spartan1 · 06-07-2018, 02:15 AM

My apologies for not mentioning the details needed , It's on Centos/Ubuntu Linux. Couldn't give much details regarding the issue, as I don't know. it's an interview question, which i didn't answer and would like to know the answer.

Thanks

pan64 · 06-07-2018, 02:56 AM

hm. first you need to check the symptoms and that will help you to narrow it down. The tools to use depend obviously on it (if it was memory/disk/network related or ???)

spartan1 · 06-07-2018, 03:22 AM

Ok, thanks for your time.

AwesomeMachine · 06-07-2018, 09:45 AM

I would use top to check for cpu hogs, and memory and swap use. If I found a process using excessive cpu or memory, I'd restart it. If swap was full I'd create an additional swap file. Then I'd check disk usage. If a any file system had less than 10% free space, I'd locate any excessively large files and possibly delete them.

Habitual · 06-07-2018, 11:21 AM

https://linoxide.com/tools/sysdig-pe...ce-linux-tool/
sysstat utilities like sar, iostat, vmstat,etc....
collectl

Habitual · 06-07-2018, 11:24 AM

Interview Question is likely common top, or htop. Any number of handy utilites.