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Question: I have a qcow2-type disk image which is used by one my guest VMs on QEMU/KVM. I want to modify the content of the disk image without powering on the VM, and for this I need to mount the disk image somewhere. Is there a way to mount a qcow2 disk image on Linux? …Continue reading...
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How to monitor OpenFlow messages with packet sniffer

http://xmodulo.com/monitor-openflow-messages.html

#openflow #sdn #sniffer #cli #linux
OpenFlow was initially introduced in the academia as a way to enable innovation on production networks which had traditionally been built with close and proprietary networking hardware. OpenFlow offloads the high-level routing/forwarding decisions (control plane) from networking devices such as switches, and moves the control plane on to a separate controller. The networking devices then …Continue reading...
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Grafana: open-source time-series graph visualization tool

http://list.xmodulo.com/grafana.html

#opensource #sysadmin #devops
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Question: I want to back up the file permissions of the local filesystem, so that if I accidentally mess up the file permissions, I can restore them to the original state. Is there an easy way to back up and restore file permissions on Linux? You may have heard of a tragic mistake of a …Continue reading...
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rsync -aAu ?
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Question: On my desktop, I want to change the initial splash screen which is shown during boot time. How can I customize boot splash screen on [Ubuntu, Linux Mint]? When you power up your Ubuntu/Mint desktop and the boot procedure gets started in the background, you see a nice graphical animation appear in the screen. …Continue reading...
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If you often create guest VMs or containers on your Linux computer, you will go through package installation many times across different VMs/containers. In that case, your time may be better spent on something more productive than just waiting to finish installing packages. While server provisioning tools like Puppet, Chef or Ansible can automate the …Continue reading...
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How to upgrade Docker on Debian or Ubuntu using the official source

http://ask.xmodulo.com/upgrade-docker-debian-ubuntu.html

#docker #container #debian #ubuntu
Question: I installed Docker from the base repository of my distro, which seems to be out-of-date. How can I upgrade Docker on [Ubuntu or Debian], preferably using the official source? While Debian, Ubuntu or their derivatives offer Docker in their base repositories, the version of their Docker tends to be quickly outdated as Docker has …Continue reading...
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Fluentd - open-source unified log collection system

http://list.xmodulo.com/fluentd.html

#opensource #sysadmin #devops
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When it comes to searching text within a PDF document, pretty much every PDF reader supports it. However, it becomes tricky when there are more than one PDF document to search. While the official Adobe Reader offers multiple PDF search functionality (i.e., searching all PDF files in a directory), it has discontinued on Linux. None …Continue reading...
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In today's online retail market dominated by cut throat competitions, one player stands in the forefront, leaving the pack far behind, and that is Amazon. Amazon has been judiciously expanding its business model to satisfy consumer appetites, and I think Amazon Prime membership lies in the center of its expanding business model. Starting out as …Continue reading...
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Have them in circles
2,527 people
Kratos GOW's profile photo
Vinothkumar Chokkalingam's profile photo
Sayeed Syed's profile photo
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Martin Tempelaar's profile photo
Adam Stokes's profile photo
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Randhir Singh Paul's profile photo
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Linux FAQs, tips and tutorials, covering server administration, Linux desktop environment, Linux open-source software and cloud services.