Clear PageCache only
# sync; echo 1 > /proc/sys/vm/drop_caches
Clear dentries and inodes
# sync; echo 2 > /proc/sys/vm/drop_caches
Clear PageCache, dentries and inodes
# sync; echo 3 > /proc/sys/vm/drop_caches
Seperate Private Key and Certificate file
#Generate certificates bundle file
openssl pkcs12 -nokeys -in server-cert-key-bundle.p12 -out server-ca-cert-bundle.pem
#Generate server key file.
openssl pkcs12 -nocerts -nodes -in server-cert-key-bundle.p12 -out server.key
Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM
openssl pkcs12 -in keyStore.pfx -out keyStore.pem -nodes
Create a .pfx/.p12 certificate file using OpenSSL
openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt
Src: https://www.sslshopper.com/article-most-common-openssl-commands.html
This will install Zoneminder by using a shell script with one basic command (how easy is that!).
You will need a Ubuntu 18.04 install with LAMP (Apache, MySQL and PHP) installed desktop or server. As an alternate you may use Mariadb in lieu of MySQL
Shell script file contents:
#!/bin/sh clear read -p "This script installs Zoneminder 1.32.x on Ubuntu 18.04 AMD64 with LAMP (MySQL) installed... Press Enter to continue or Ctrl + c to quit" nothing clear read -p "You must be logged in as root using sudo su ... Press Enter to continue or Ctrl + c to quit" nothing clear read -p "Next we will add the PPA repository, install and configure the system to run Zoneminder. Press enter to continue" nothing apt install -y software-properties-common clear add-apt-repository ppa:iconnor/zoneminder-1.32 apt update clear awk '$0="date.timezone = "$0' /etc/timezone >> /etc/php/7.2/apache2/php.ini clear apt install -y zoneminder systemctl enable zoneminder service zoneminder start adduser www-data video a2enconf zoneminder a2enmod rewrite chown -R www-data:www-data /usr/share/zoneminder/ service apache2 reload clear read -p "Install complete.Press enter to continue" nothing clear
Copy the contents of the script, open a terminal and run: Continue reading “Install Zoneminder on Ubuntu 18.04 with shell script” »
This can be placed in /etc/snmp/snmpd.conf and will provide the required parameters for Observium. This example use version 2c snmp auth.
Community string: Replace community_string with your unique community string.
# Listen for connections on all interfaces (both IPv4 *and* IPv6) agentAddress udp:161,udp6:[::1]:161 # Full view access view all included .1 # system + hrSystem groups only view systemonly included .1.3.6.1.2.1.1 view systemonly included .1.3.6.1.2.1.25.1 # Default access to full view rocommunity community_string default -V all # Default access to basic system info #rocommunity public default -V systemonly # System contact and location syslocation Rack/Room/Building, Street, City, Country [GPSX,Y] syscontact Contact Person <your@email.address> # Disk Monitoring disk / 10000 disk /var 5% includeAllDisks 10% # Unacceptable 1-, 5-, and 15-minute load averages load 12 10 5 # This line allows Observium to detect the host OS if the distro script is installed extend .1.3.6.1.4.1.2021.7890.1 distro /usr/local/bin/distro # This lines allows Observium to detect hardware, vendor and serial extend .1.3.6.1.4.1.2021.7890.2 hardware /bin/cat /sys/devices/virtual/dmi/id/product_name extend .1.3.6.1.4.1.2021.7890.3 vendor /bin/cat /sys/devices/virtual/dmi/id/sys_vendor extend .1.3.6.1.4.1.2021.7890.4 serial /bin/cat /sys/devices/virtual/dmi/id/product_serial # This line allows Observium to collect an accurate uptime extend uptime /bin/cat /proc/uptime # This line enables Observium's ifAlias description injection pass_persist .1.3.6.1.2.1.31.1.1.1.18 /usr/local/bin/ifAlias_persist
Continue reading “SNMP Client Configuration for Observvium” »
Proxmox Virtual Environment (VE) is an enterprise-grade open-source server virtualization solution based on Debian Linux distribution with a modified Ubuntu LTS kernel. It allows you to deploy and manage both virtual machines and containers.
This setup presumes you have a running Debian 10 Buster Linux server running. If you don’t have one, follow our guide to Install Debian 10 on a dedicated server that will be used as a hypervisor. Please note that you need a 64-bit processor with support for the Intel 64 or AMD64 CPU extensions.
Below are the steps you’ll follow through to install Proxmox VE 6 on Debian 10 (Buster).
Step 1: Update Debian OS
Update apt package index before getting started.
sudo apt -y update sudo apt -y upgrade sudo reboot
Step 2: Set system hostname
We need to set the hostname and make sure it is resolvable via /etc/hosts.
sudo hostnamectl set-hostname prox6node01.example.com --static
echo "10.1.1.10 prox6node01.example.com prox6node01" | sudo tee -a /etc/hosts
example.com should be replaced with a valid domain name. Continue reading “Install Proxmox VE 6 on Debian 10 (Buster)” »
To change logo (On Zimbra 8.6 and onwards)
zmprov md mail.dscsc.mil.bd zimbraSkinLogoLoginBanner https://yourdomain.com/zimbra/MyLoginBanner.png zmprov md mail.dscsc.mil.bd zimbraSkinLogoAppBanner https://yourdomain.com/zimbra/MyAppBanner.png
To change logo height:
changed hhe contents of file /opt/zimbra/jetty/webapps/zimbra/skins/_base/base3/skin.properties
... 90 LoginH1 = margin:0 0 30px 30px; 91 LoginAppName = display:none; 92 LoginLabelColor = @TxtC@ 93 LoginButton = @ButtonShadowDefault@ border:1px solid @ButtonBorderColor@; 94 LoginBannerImg = @LogoImgDir@/LoginBanner.png?v=@jsVersion@ //95 LoginBanner = @img(, LoginBannerImg, 450px, 36px)@ //old 95 LoginBanner = @img(, LoginBannerImg, 450px, 90px)@ //new 96 LoginFooterColor = color:@darken(AppC,55)@; 97 LoginErrorPanel = background-color:#FF9; padding:5px; @roundCorners(8px)@ ...
Apply it-
zmmailboxdctl restart
GitLab is an open source GIT repository manager based on Rails and developed by GitLab Inc. It is a web-based GIT repository manager that allows your team to work on code, track bugs and feature requests and to test and deploy applications. GitLab provides features like a wiki, issue tracking, code reviews, activity feeds and merge management. It is capable of hosting multiple projects.
GitLab is available in four editions:
In this tutorial, I will show you step-by-step how to install GitLab CE (Community Edition) on your own Ubuntu 16.04 Xenial Xerus server. In this tutorial, I will be using the ‘omnibus’ package provided by GitLab for easy installation.
What we will do:
Prerequisites
Step 1 – Install required Ubuntu Packages
The first step is to install the packages needed for the GitLab installation. Please log in to the server as root user and upddate the Ubuntu repository.
ssh root@GitLabServer apt-get update
Now install the packages including curl for downloading the GitLab repository, ca-certificates, and postfix for the SMTP configuration. Install all packages with the apt command below.
sudo apt install curl openssh-server ca-certificates postfix
During postfix installation, you will be prompted about the configuration, select ‘Internet Site’. and then enter the server domain name that shall be used for sending an email. Continue reading “How to Install and Configure GitLab on Ubuntu 16.04” »
Mapping a network drive in Windows
Go to the Start menu and click on ‘Computer’.
When the ‘Computer’ file browser window opens, then click on ‘Map network drive’. Continue reading “Accessing Nextcloud files using WebDAV” »
The procedure is as follows:
Let us see all commands in details.
How to see a list of www-data members
To see list of all members of a group named www-data, run the following grep command on /etc/group file:
grep ^www-data /etc/group
Sample outputs:
www-data:x:33:
How do I add an existing user named vivek to group Apache group www-data? Continue reading “Add a User To Group www-data ( Apache Group )” »
Below is the system requirements for the installation of latest Laravel application on your system.
PHP >= 7.2 OpenSSL PHP Extension PDO PHP Extension Mbstring PHP Extension Tokenizer PHP Extension XML PHP Extension Ctype PHP Extension JSON PHP Extension BCMath PHP Extension
Step 1 – Install LAMP
To start with Laravel, we first need to set up a running LAMP server. If you have already running LAMP stack skip this step else use followings commands to set up the lamp on Ubuntu system.
sudo apt-get install python-software-properties sudo add-apt-repository ppa:ondrej/php sudo apt-get update sudo apt-get install -y php7.2 php7.2-mcrypt php7.2-gd php7.2-mbstring php7.2-xml
Install PHP Mcrypt Extension & Install Apache2
sudo apt-get install apache2 libapache2-mod-php7.2
Install MySQL
sudo apt-get install mysql-server php7.2-mysql
Step 2 – Install Composer
The composer is required for installing Laravel dependencies. So use below commands to download and use as a command in our Continue reading “Install Laravel 5 Framework on Ubuntu 18.04 & 16.04” »
Prerequisites
Before you start this procedure you’ll need to do the following.
On the host system, run the following command:
cd /path/to/vbox/disks VBoxManage modifyhd OldDisk.vdi –-resize 30000
where OldDisk.vdi is the filename of the virtual disk VDI file you want enlarge and 30000 is the new maximum size (in megabytes) of the virtual disk.
If your host OS is Windows, then the commands you need to enter at the Command Prompt will look more like the following. Continue reading “Resizing a VirtualBox Virtual Hard Disk” »
SoftEther VPN is one of the world’s most powerful and easy-to-use multi-protocol VPN software, made by the good folks at the University of Tsukuba, Japan. It runs on Windows, Linux, Mac, FreeBSD and Solaris and is freeware and open-source. You can use SoftEther for any personal or commercial use free of charge.
Step 1: Create a Virtual Server
First, you need to create a DigitalOcean Droplet. As mentioned in SoftEther’s website, SoftEther will work on almost every Linux distro with kernel v2.4 or above,; however it’s recommended to choose one of these distributions: CentOS, Fedora, or Red Hat Enterprise Linux.
Personally I have tried it on Ubuntu, CentOS and Fedora, both 32 and 64 bit editions, and it has worked perfectly.
Step 2: Update your Server Software
Using the command below, update and upgrade your server software packages to the latest version:
Debian / Ubuntu:
apt-get update && apt-get upgrade
CentOS / Fedora:
yum upgrade
Step 3: Download SoftEther
You can download the latest SoftEther server package for Linux from their website:
Download SoftEther
Unfortunately, there is no way of getting the latest version through package managers (or even using a single url) at the moment. Therefore you have to browse their website using a desktop browser to download the package. There are a couple of ways of dealing with this: First, browse their website on your own computer and then depending on your server configuration (OS, x86/x64, etc.) find the link to the appropriate package then use wget to download the package to your server. Alternatively, you can use a terminal based web browser such as lynx to browse the SoftEther website and download the right package. Continue reading “How to Setup a Multi-Protocol VPN Server Using SoftEther” »
