Administrations

Remove Old Kernels of Debian/Ubuntu

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To find out the current version of Linux kernel running on your system, use the following command.

$ uname -sr
Linux 4.12.0-041200-generic

To list all installed kernels on your system, issue this command.

$ dpkg -l | grep linux-image | awk '{print$2}'

linux-image-4.12.0-041200-generic
linux-image-4.8.0-22-generic
linux-image-extra-4.8.0-22-generic
linux-image-generic

Remove Old Unused Kernels on Debian and Ubuntu

Run the commands below to remove a particular linux-image along with its configuration files, then update grub2 configuration, and lastly reboot the system.

$ sudo apt remove --purge linux-image-4.4.0-21-generic
$ sudo update-grub2
$ sudo reboot

Removing Old Kernel in Ubuntu

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Reboot Windows 10 using RDP

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This article is for sysadmins who know better, wanting to Shut down or Restart (or even enter Sleep) over RDP anyway.

At left, user clicked on Start, Power, then has three choices. Using RDP at right, choices are rather limited.

Using Command Prompt

Open a Command Prompt

a. To initiate a Shut down, type:

shutdown /s /t 0

then press Enter

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Enable TLS 1.0 in Firefox Browser

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Firefox 43 supports TLS 1.0, 1.1, and 1.2 by default. You shouldn’t need to make any changes, but you can double-check the settings here if you like:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste TLS and pause while the list is filtered

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Add SNMP to Windows Server- 2012

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This step-by-step article describes how to configure the Simple Network Management Protocol (SNMP) Service in Windows Server 2012/2012R2. We will install SNMP service and configure SNMP security.

SNMP Service Installation

  1. Open Server Manager and then click Add Roles and Features.
  2. In Select Features, check the box next to SNMP Service.
  3. A dialog box appear to add all others required features, click Add Features.
  4. Click Next and then Install.
  5. SNMP Security Configuration
  6. Open Windows Services and locate service called SNMP Service then open service properties.
  7. Click on Security tab.In Accepted community names, click add to add the required community name and rights.
  8. Select Accept SNMP packets from these hosts option and then click Add to add Hostname, IP Address of the Monitoring Server.
  9. Click OK and then restart SNMP service.

You’re done.

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Solving A remote code execution vulnerability exists in the Credential Security Support Provider protocol (CredSSP) on Windows RDP

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WORKAROUND

Use the group policy settings changes described below to rollback the changes to ‘Vulnerable’ state to allow RDP access.

1. Open Group Policy Editor, by executing gpedit.msc

2. Policy path: Computer Configuration -> Administrative Templates -> System -> Credentials Delegation

Run gpedit.msc and expand Administrative Templates

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Install phpIPAM on Ubuntu 20.04/18.04

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The objective of this guide is to help you Install and Configure phpIPAM on Ubuntu 20.04/18.04 Linux distribution. phpIPAM is an open-source php-based web IP address management application (IPAM). Its goal is to provide light, modern and useful IP address management. phpIPAM uses MySQL database backend and jQuery libraries, Ajax and HTML5/CSS3 features.

Install phpIPAM on Ubuntu 20.04/18.04

phpIPAM has a number of dependencies that we need to install before we can install and configure phpIPAM. These are:

  • MySQL / MariaDB server
  • php / php-fpm for nginx
  • php modules
  • Apache / nginx web server
  • phpIPAM domain – ipam.example.com (should be replaced with your domain)

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Fixing Vesta CP Exim Email Incoming error with T=local_delivery defer (-1): Malformed value “0MM”

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Applicable for vesta cp 1.0.0-5 version)
********

If you lately encounter an issue with mail incoming with vesta cp after an auto update took place, your /var/log/exim/main.log shows something similar below-

2021-12-19 03:39:42 1mxheU-000374-0o == mail@domain.com R=localuser T=local_delivery defer (-1): Malformed value “0MM” (expansion of “${extract{6}{:}{${lookup{$l$….

Step-1 Finding vesta version

Well the following steps I had to do to solve. Before further proceedings we need to find out vesta version. My particular version 1.0.0-5 is generating this error of receiving email- specially where disk quota of email users had “Unlimited” quota.

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Pushing Docker Images to a Docker Repository

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The next logical step after creating a new image from an existing image is to share it with a select few of your friends, the whole world on Docker Hub, or other Docker registry that you have access to. To push an image to Docker Hub or any other Docker registry, you must have an account there.

This section shows you how to push a Docker image to Docker Hub. To learn how to create your own private Docker registry, check out How To Set Up a Private Docker Registry on Ubuntu 14.04.

To push your image, first log into Docker Hub.

docker login -u docker-registry-username

You’ll be prompted to authenticate using your Docker Hub password. If you specified the correct password, authentication should succeed.

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Docker Commands

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Working with Docker Images

Docker containers are built from Docker images. By default, Docker pulls these images from Docker Hub, a Docker registry managed by Docker, the company behind the Docker project. Anyone can host their Docker images on Docker Hub, so most applications and Linux distributions you’ll need will have images hosted there.

To check whether you can access and download images from Docker Hub, type:

docker run hello-world

The output will indicate that Docker in working correctly:

Output
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest: sha256:41a65640635299bab090f783209c1e3a3f11934cf7756b09cb2f1e02147c6ed8
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.
...

Docker was initially unable to find the hello-world image locally, so it downloaded the image from Docker Hub, which is the default repository. Once the image downloaded, Docker created a container from the image and the application within the container executed, displaying the message. You can search for images available on Docker Hub by using the docker command with the search subcommand. For example, to search for the Ubuntu image, type:

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Install Docker on Debain 10

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Installing Docker

The Docker installation package available in the official Debian repository may not be the latest version. To ensure we get the latest version, we’ll install Docker from the official Docker repository. To do that, we’ll add a new package source, add the GPG key from Docker to ensure the downloads are valid, and then install the package.

First, update your existing list of packages:

sudo apt update

Next, install a few prerequisite packages which let apt use packages over HTTPS:

sudo apt install apt-transport-https ca-certificates curl gnupg2 software-properties-common

Then add the GPG key for the official Docker repository to your system:

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