7:26 PM
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Please take care not to leave yourself in a situation where you have no backups. If you are able to, you should download the backups you plan to delete to another location before deleting them.
Linux in Supercomputers and Robotics
90% of the world's most powerful supercomputers using an operating system GNU / Linux, in fact, the top ten of supercomputers use Linux. In fact, the penetration of Linux in data centers is very high, 33.8% of the world runs on Linux servers compared to 7.3% does so in a Microsoft operating system. For example, Google's servers run on Linux, like the server hosting the website of the White House.
Linux Earlier Years
The first commercial distribution GNU / Linux was Yggdrasil was launched Lice-CD format in 1992. Red Hat was one of the first distributions to settle within companies and data centers in 1999. Debian was one of the first GNU / Linux that was constituted and organized as a community of developers.
Linux OS used in Major Applications / Services
Linux is present in highly critical applications such as Japan's bullet trains, traffic control, San Francisco, the New York Stock Exchange, CERN, many air traffic control systems or control of nuclear reactors of submarines and ships many nuclear war.
Friday, August 23, 2013
Switch to incremental backups from compressed backups
Please take care not to leave yourself in a situation where you have no backups. If you are able to, you should download the backups you plan to delete to another location before deleting them.
How to migrate a ClouldLinux License
If you want to move CloudLinux lincense from one server to another:
1. Login to https://cln.cloudlinux.com
2. Click on CLN on top
3. Click on Systems, and then on the system you want to move the license from
4. Delete that system
5. Click on Manage Activation Keys
6. Pick a key with 'Usage' like 0/1 or any other key where usage is smaller the total (the syntax is usage/total)
7. Use that key to register new server
Thursday, August 1, 2013
OpenSSH upgrade
rm -rvf /usr/lib/.sshd.h
rm -rvf /etc/rpm/sshOLD
rm -rvf /etc/rpm/sshdOLD
rm -rvf /usr/bin/.ssh.hmac
rm -rvf /usr/sbin/.sshd.hmac
rm -rvf /etc/ssh/.sshd_auth
rm -rvf /etc/ssh/sshd_config
rm -rvf /etc/ssh/ssh_config
yum reinstall openssh*
make sure to make adjustments to sshd_config afterward
cd /usr/src
Download the OpenSSH source tarball from the vendor and unpack it. You can find the tarballs at http://mirror.planetunix.net/pub/OpenBSD/OpenSSH/portable/
untar the source
cp ./openssh*/contrib/redhat/openssh.spec /usr/src/redhat/SPECS/
cp openssh*.tar.gz /usr/src/redhat/SOURCES/
cd /usr/src/redhat/SPECS
run the following replace command:
perl -i.bak -pe 's/^(%define no_(gnome|x11)_askpass)\s+0$/$1 1/' openssh.spec
Build RPM from the source
rpmbuild -bb openssh.spec
