Failed to Start Libvirtd

Environment: OS: CentOS Linux release 7.5.1804 (Core) Error Message: # journalctl -u libvirtd -- Logs begin at Wed 2019-01-30 17:46:41 AEDT, end at Wed 2019-01-30 18:02:09 AEDT. -- Jan 30 17:47:09 ovs-sandbox2 systemd[1]: Starting Virtualization daemon… Jan 30 17:47:14 ovs-sandbox2 libvirtd[1483]: 2019-01-30 06:47:14.936+0000: 1483: info : libvirt version: 4.5.0, package: 10.el7_6.3 (CentOS BuildSystem http://bugs.centos.org, 2018-11-28-20:51:39, …

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Install Docker Offline on Centos7

Recently, I had to build an environment which have a kind of real web application running to test LBaaS site affinity solution,. After a few minutes,I made a decision to install a Jenkins container on my testing Centos 7 virtual machines.  Unfortunately, my Centos virtual machines have no Internet access. So I spent a bit …

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Install PowerCLI and PowerNSX Offline on RHEL7

With the release of PowerCLI 10.0.0, VMware adds support for Mac OS and Linux! Now you can install PowerCLI and PowerNSX on Linux System including RHEL, Centos, Unbuntu and Mac OS. To complete installation of VMware PowerCLI 10 and PowerNSX, firstly you need to install Powershell Core 6.0. In most of enterprise environments, we won't …

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SR-IOV Performance on Centos7 VM

This blog is to demonstrate network performance (network throughput here only) for a SR-IOV enabled Centos7 virtual machine which is running on vSphere 6. Regarding the vSphere 6.5 support to SR-IOV, please refer the link below: Single Root I/O Virtualization My testing environment is on IBM Cloud: Virtual machine specification: 4 vCPU/16G Memory; OS: Centos …

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NSX IPSec Throughput in IBM Softlayer

To understand the real throughput capacity of NSX IPSec in Softlayer, I built a quick IPSec performance testing environment. Below are the network topology of my testing environment: NSX version: 6.2.4 NSX Edge: X-Large (6 vCPUs and 8G Memory), which is the largest size NSX offers. All of Edges in this testing enviroment reside in the …

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Converting between image formats using qemu-img

Converting images from one format to another is generally straightforward. qemu-img is the tool which I use a lot. qemu-img can convert different fomat including raw, qcow2, qed, vdi, vmdk, vhd. On Centos, qemu-img can only be installed on 64bit version. As an example, I will show you how to convert Netscaler VPX raw image to qcow2 for …

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Create Your Own Unetlab Juniper vMX Image

According to Unetlab, Unetlab support the following version vMX: 14.1R1.10-domestic and 14.1R4.8-domestic I can get the 14.1R1.10 easily from Internet. However, I can't find a packaged 14.1R4.8 image for Unetlab. I went to Unetlab and ask for help. Unfortunately, nobody responded me. As I need to use the newer version for my eVPN lab (eVPN HA), I had to …

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