Category Archives: Virtualization

In computing, virtualization refers to the act of creating a virtual version of something, including virtual computer hardware platforms, storage devices, and computer network resources.

Redis: Sentinel – bind 0.0.0.0, the localhost issue and the announce-ip option
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10 April 2019

Originally, in a Sentinel’s configs, I have used the bind 0.0.0.0 to make them accessible from external hosts. Because of this when I started rolling out this setup on a real environment faced with an issue when Sentinels could not determine a Master host and other Sentinel hosts. In this post – such an issue… Read More: Redis: Sentinel – bind 0.0.0.0, the localhost issue and the… »

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MySQL/MariaDB: like Petya ransomware for MySQL and ‘root’@’%’ access
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3 April 2019

This story happened on 10/06/2017, adding this post in English now. The original post (Rus) was written almost right after the well-known Not a Petya attack in Ukraine – that’s why it’s used in the title. I had a new project assigned to me. When I started its existing setup investigation – was just shocked.… Read More: MySQL/MariaDB: like Petya ransomware for MySQL and ‘root’@’%’ access0 (0) »

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Kubernetes: running Minikube on Arch Linux
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27 March 2019

Minikube – a utility to run a Kubernetes cluster locally on your PC. It can use Virtualbox, VMware, Hyper-V etc hypervisors which will be used to create a virtual machine with a Kubernetes cluster. Minikube is a great tool for developers or DevOps engineers to test deployments/services etc without the need to create and configure… Read More: Kubernetes: running Minikube on Arch Linux0 (0) »

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What is: chroot – system call and utility in Linux
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23 March 2019

chroot() was added to the Version 7 Unix in 1979 and used for filesystem isolation. In fact, it’s the predecessor of the whole current containerization idea, just now there are namespaces and cgroups are used while earlier chroot was used to create an environment which is isolated from a host and can be used for… Read More: What is: chroot – system call and utility in Linux0… »

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AWS: CLI named profiles
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19 March 2019

AWS CLI supports so-called named profiles stored in the configuration file .aws/config and ~/.aws/credentials file with keys which by default contains the… Well – the “default” profile. An additional profile can be added using the aws configure command with the –profile option. Here is an example of such file with already existing two profiles: [simterm]… Read More: AWS: CLI named profiles0 (0) »

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Terraform: creating a project with an AWS EC2, VPC, and AWS cross-region VPC peering connection
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18 March 2019

One of the disappointing surprises in my AWS CloudFormation experience was the fact that it wasn’t able to automatically create cross-region VPC-peering connections. Note: this post originally was written in Rus on 28 June 2018 but now CloudFormation can do it, check the PeerRegion parameter of the AWS::EC2::VPCPeeringConnection resource. As a result – it tries… Read More: Terraform: creating a project with an AWS EC2, VPC, and… »

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Terraform: main commands, state-files, backend storages, and modules in examples on AWS
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17 March 2019

Examples of how to use Terraform, work with its backends and modules. Here will set up a simple EC2 instance in AWS and will store Terraform’s state-files in an AWS S3 bucket. In short terms – but with real examples and links to documentation. Installation on Arch Linux: [simterm] $ sudo pacman -S terraform [/simterm]… Read More: Terraform: main commands, state-files, backend storages, and modules in examples… »

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NextCloud: installing server on Debian behind NGINX with PHP-FPM and client on Arch Linux
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17 March 2019

After the news that Dropbox adds a new limitation for users by the three devices only – I’m finally ready to install my own NextCloud to store and synchronize data. The sad thing is not exactly the three devices limit (and it will be applied for a new users only – old user who already… Read More: NextCloud: installing server on Debian behind NGINX with PHP-FPM and… »

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VirtualBox: Nonexistent host networking interface, name ‘wlp13s0’
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11 March 2019

Have the ~/VirtualBox VMs directory copied from my old laptop to a new PC. Now during VM’s launch – VirtualBox says: Nonexistent host networking interface, name ‘wlp13s0’ (VERR_INTERNAL_ERROR). Result Code: NS_ERROR_FAILURE (0x80004005) Component: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed} Check interfaces on the new PC: [simterm] $ ip a s 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue… Read More: VirtualBox: Nonexistent host networking interface, name ‘wlp13s0’0 (0) »

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Prometheus: RTFM blog monitoring set up with Ansible – Grafana, Loki, and promtail
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10 March 2019

After implementing the Loki system on my job’s project – I decided to add it for myself, so see my RTFM blog server’s logs. Also – want to add the node_exporter and alertmanager, to be notified about high disk usage. In this post, I’ll describe the Prometheus, node_exporter, Grafana, Loki, and promtail set up process… Read More: Prometheus: RTFM blog monitoring set up with Ansible – Grafana,… »

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