A group is a system object — much the same as a user — except that no one will ever log in to the system as a group. The power of groups is in how they, like users, can be “assigned” to files or directories, allowing any group members to share the group powers.
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Quotes tagged ‘Linux’
Stalled means the processor was not making forward progress with instructions, and usually happens because it is waiting on memory I/O. The ratio I drew above (between busy and stalled) is what I typically see in production. Chances are, you're mostly stalled, but don't know it.
You can additionally reduce latency by applying CPU affinity on each thread/process, e.g. nginx has worker_cpu_affinity directive, that can automatically bind each web server process to its own core. This should eliminate CPU migrations, reduce cache misses and pagefaults, and slightly increase inst…
A service called fail2ban can mitigate this problem (edit: SSH being public) by creating rules that can automatically alter your iptables firewall configuration based on a predefined number of unsuccessful login attempts. This will allow your server to respond to illegitimate access attempts without…