Quickly create a (swap)file on linux

The traditional way for creating a linux swapfile would be using dd to create an empty file e.g. A faster way is to use “fallocate” e.g. 1) http://www.cyberciti.biz/faq/ubuntu-linux-create-add-swap-file/ Don’t forget the usually procedure for swapfiles: References   [ + ] 1. ↑ http://www.cyberciti.biz/faq/ubuntu-linux-create-add-swap-file/

Migration of OpenVZ Container to KVM Guest

This is a short tutorial how to migrate an OpenVZ container to a KVM Guest. Some ideas have been taken from other tutorials1) https://www.pither.com/simon/blog/2011/09/20/convert-an-openvz-vm-to-kvm 2) http://blog.smile.fr/Migrate-your-openvz-containers-to-kvm-openstack , the other half has been extracted from grml-debootstrap which can generate a KVM guest by using debootstrap. Update 2016/09/20: with some minor fixes and one missing command (copy […]

Moving to KVM

Since our beloved OpenVZ virutalisation technology is not moving in a direction we are comfortable with, we are currently evaluation several virtualisation technologies. One the the possible options is KVM. This is not a full tutorial about KVM, there are many good tutorials already, e.g. 1)https://www.lisenet.com/2016/getting-started-with-kvm-on-debian-jessie/ or 2)http://linuxnewbieguide.org/?p=1993 or 3)http://xmodulo.com/use-kvm-command-line-debian-ubuntu.html or 4)http://wiki.libvirt.org/page/UbuntuKVMWalkthrough or 5)http://www.cyberciti.biz/faq/how-to-install-kvm-on-ubuntu-linux-14-04/, this […]

Running “backticks” commands on remote servers

Sometimes it’s necessary to run a complex command on a remote server witch also includes some “backticks”. Usually these commands are interpreted by the local shell so you need to use a little trick to force execution on the remote server: ssh this.is.my.beautiful.server ‘( echo `echo “This Command is run on the remote server” ` […]

Update for the Checklist on “mailout” servers

This is an update to the checklist to create a prefect mailout server: Original Checklist Setup DMARC DNS Record to receive mail delivery reports https://www.unlocktheinbox.com/dmarcwizard/ btw: I Just started adding all those settings to my own domain too. Google DKIM signing is still waiting for DNS propagation.

Java SSL Certificate Verification Error

If you come across the situation, that your java programs are not able to connect to ssl encrypted services, it might be most likely that the java cacerts keystore is empty or not uptodate. This might also be due to a bug in the java (or ca-certificate-java) package 1)https://bugs.launchpad.net/ubuntu/+source/ca-certificates-java/+bug/1396760. In order to fix the issue, […]