Setting the time

To set the time, first determine what is the hardware time:

hwclock -r

To set the time and date:

date -s "2 OCT 2006 18:00:00"

To set the time only:

date +%T -s "10:13:13"

To set the hardware time using the system time:

hwclock -w

Slurm: spread jobs evenly

To configure SLURM to spread the jobs evenly, edit /etc/slurm/slurm.conf:

vi /etc/slurm/slurm.conf

SelectTypeParameters=CR_LLN

Spread the file to all machines and run:

service slurm restart

Bash: add time to prompt

To add time stamps inside our bash prompt, add the following to ~/.bash_profile:

export PS1="(\t) $PS1"

Yum: clone a repository

To clone a repository, say .. CentOS's update repository:

rsync -avr rsync://centos.syn.co.il/centos/6.5/updates/x86_64/ --delete --exclude=debug/ /var/www/html/centos/updates/6.5/

Install fwbackups on CentOS 6

1. Install the following dependencies:

yum install automake autoconf gettext python cronie pygtk* libglade2-devel python-crypto python-paramiko notify-python make gcc intltool -y

2. Download the source from SourceForge:

cd /tmp

wget http://downloads.diffingo.com/fwbackups/fwbackups-1.43.4.tar.bz2

3. Extract the archive and compile it:

tar xvf fwbackups-1.43.4.tar.bz2

cd fwbackups-1.43.4

./configure --prefix=/usr/local

make

make install

4. Edit /usr/local/bin/fwbackups and add the following to line 22:

export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.6/site-packages/

5. Start the application and start backing up stuff:

fwbackups

CentOS7: missing ifconfig

To bring back the old ifconfig command to CentOS 7, run the following:

yum install net-tools -y

CentOS7: bring back eth interface

In case you've installed CentOS 7, notice that there are no ethX interfaces, to bring them back:

1. Use the following command to add two parameters to the linux kernel line:

sed -i "s/quiet.*/quiet net.ifnames=0 biosdevname=0\"/" /etc/default/grub

2. Recreate the new grub configuration using the following command:

grub2-mkconfig -o /boot/grub2/grub.cfg

3. Reboot the computer.