# login as root with
su -
# not '-' sign - important!
#allocate file: 20 GB = 20 * 1024 * 1024
dd if=/dev/zero of=/swapfile bs=1024 count=20971520
mkswap /swapfile
#set permissions:
chown root:root /swapfile
chmod 0600 /swapfile
#add immediately to OS
swapon /swapfile
# edit fstab for persistence:
vi /etc/fstab
# edit fstab by adding the following line at the end of the file:
/swapfile /swap swap defaults 0 0
# check if the swap is allocated
free -m
Wednesday, May 16, 2012
Wednesday, May 02, 2012
Increase number of open files per user
http://prefetch.net/blog/index.php/2009/07/31/increasing-the-number-of-available-file-descriptors-on-centos-and-fedora-linux-servers
$ ulimit -n
1024
$ cat /proc/sys/fs/file-max
366207
$ echo 512000 > /proc/sys/fs/file-max
$ cat /proc/sys/fs/file-max
512000
$ vi /etc/security/limits.conf
Now add a line after @student (the last user listed)
@username - nofile 70000
$ ulimit -n
8192
$ ulimit -n
1024
$ cat /proc/sys/fs/file-max
366207
$ echo 512000 > /proc/sys/fs/file-max
$ cat /proc/sys/fs/file-max
512000
$ vi /etc/security/limits.conf
Now add a line after @student (the last user listed)
@username - nofile 70000
$ ulimit -n
8192
Subscribe to:
Posts (Atom)