View and modify kernel parameters at runtime for a single session.
Also the name of a deprecated system call TODO in favor of what? Writing to /proc/sys files?
Documentation of all kernel parameters: https://github.com/torvalds/linux/blob/master/Documentation/kernel-parameters.txt
List all:
sudo sysctl –a
TODO check Each entry of form:
a.b.c
corresponds to a file under:
/proc/sys/a/b/c
So you can also get its value with:
cat /proc/sys/a/b/c
Set a value for the current session:
sudo sysctl a.b.c=d
with /proc/sys/ directly:
echo d | sudo tee -a /proc/sys/a/b/c
See:
man core
How core files are named:
cat /proc/sys/kernel/core_pattern
If it starts with a pipe character |, this will call the given program to deal with the coredump. Ubuntu 14.04 for example has:
|/usr/share/apport/apport %p %s %c %P
which passes the work to apport.
Control ASLR.
echo 0 | sudo tee /proc/sys/kernel/randomize_va_space
echo 2 | sudo tee /proc/sys/kernel/randomize_va_space
Configuration files to make settings permanent.
All files in the .d get sourced.
The effective hostname.
Normally taken from /etc/hostname at startup.
http://askubuntu.com/questions/103915/how-do-i-configure-swappiness