This article demonstrates how to tell a Linux server to shutdown or reboot in a set number of minutes or hours from now. For example, suppose you have a Linux server that needs a reboot for updates to apply but you want to go to lunch – and people are
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Retention with Tar Backups
This article discusses how to keep the most recent 7 backups of a Linux system. When we say “we want x days of backups retention” we’re simply stating the number of days we can go back to retrieve files from the backups. Here is an example: /bin/tar -czf /media/backups/backup-$(date +%w).tgz
Read moreFirefox Vulnerability – Quick Update
Just a quick update to remind you that you should be updating Firefox in order to stay safe from the latest vulnerability which was announced on August 5th. This effects Windows and Linux so make sure that you update both. The current version for Firefox the contains the fix at
Read moreAndrew Galdes gave a talk on OpenShift
Recently i gave a talk on OpenShift to the LinuxSA community group. The discussion topic each month ranges from simple to complex, trending to bleeding-edge and this particular presentation was on the OpenShift platform. Openshift is the platform of choice for Web-App and Mobile-App development for those who know about
Read moreHardening a Postfix Relay mail server
This article is about hardening a Linux Postfix mail server. We’re discussing a Postfix mail server used as a relay to our company Exchange server. When the business uses Microsoft Exchange to host the company email, Postfix can easily be the mail filter blocking out the spam and virus infected
Read moreHow to convert a PuTTYgen key to SSH format
The following command will convert the key generated from “PuTTYgen” to something that OpenSSH can use. In other-words, if you want to use putty, you must do this. This is done on the Linux server as the user who wants the key: ssh-keygen -i -f puttygen_key >> ~/.ssh/authorized_keys First you
Read moreSecure your Web Site with a .htaccess file
A simple way to secure your website is with a “.htaccess” file. When i say “secure” i simply mean the website (or sub directory) will require a password to gain access. This is great for when you are still developing the website or when you have a directory within the
Read moreHow to Mount a Windows share from Linux
This article demonstrates how to mount a windows CIFS/SMB share from a Linux host. TIP: You should test that your mount configuration works before rebooting. If you reboot with a bad mount configuration, the Linux server may not boot back up as normal. TIP2: You can (and possibly should) put
Read moreConfigure Squid to Filter Based on MAC Address
In this article we are going to add some details to squid in order to allow it to filter based on MAC address and block certain clients from having full access. Alternatively you could reverse the rule and only allow the listed clients to have full access. First we are
Read moreInstall KVM (QEMU) Gentoo
In this article we are going to detail how to install KVM on Gentoo, for the most part it is a normal KVM install but with some Gentoo differences. Going to be installed: QEMU/KVM – Our Base libvirt – For Management virt-manager – For Extra Tools virt-manager – On our
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