Install SmokePing on CentOS 7

This tutorial explains how to install Tobias Oetiker’s Smokeping into /opt/smokeping on a CentOS 7 box.

Features of Smokeping:
– Best of breed latency visualisation.
– Interactive graph explorer.
– Wide range of latency measurement plugins.
– Master/Slave System for distributed measurement.
– Highly configurable alerting system.
– Live Latency Charts with the most ‘interesting’ graphs.
– Free and open-source Software written in Perl written by Tobi Oetiker, the creator of MRTG and RRDtool Continue reading “Install SmokePing on CentOS 7” »

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Softether Linux Client using Bridged with Softether VPN Server

It’s assumed that you already have a vpn server deployed in your network, created user, password and enabled bridged network during vpn server configuration. A sample snippet of VPN Server Bridge enabled is below-

So here’re the setup value-

  • On Softether Server IP- 103.146.221.30/24 and Gateway- 103.146.221.1
  • Client Server IP- 123.49.47.245/24, Gateway- 123.49.47.1 Once the server is connected to the vpn, it will be using 103.146.221.5 as bridged IP.

Let’s start.

My setup was done on Debian-10 fresh installation, should work on any linux distro though, it’s simple. The dependency packages that I needed were development tools/build-essentials and few other which were installed as below-

apt-get update
apt-get install build-essential gcc openssl apt-transport-https

Continue reading “Softether Linux Client using Bridged with Softether VPN Server” »

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Install ONLYOFFICE Document Server with Nginx on Debian 10

Step 1 – Install Packages Dependencies

In this first step, we will install some packages dependencies needed by the Document Server, including the RabbitMQ-server, Redis, and Nginx-extras.

Update your Debian system repository and install Document Server packages dependencies using the apt command below.

sudo apt update
sudo apt install redis-server rabbitmq-server nginx-extras gnupg2

Once all installation is complete, check the following services using the systemctl command as below.

systemctl is-enabled nginx
systemctl is-enabled rabbitmq-server
systemctl is-enabled redis-server

Now make sure all of these services are enabled and will automatically run on the system boot. Continue reading “Install ONLYOFFICE Document Server with Nginx on Debian 10” »

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Install and Secure Redis on CentOS 7

Step 1 – Install and Enable Remi Repository

Firstly, we will add the Remi repository to the CentOS 7 system. The Remi repository provides the latest version of Redis package for our installation.

Before adding the Remi repository, let’s install the EPEL repository and yum utility packages.

sudo yum install epel-release yum-utils

Now add the Remi repository for CentOS 7 using the yum command below.

sudo yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm

After that, enable the ‘remi’ repository using the yum-config-manager tool as below.

sudo yum-config-manager --enable remi

The Remi repository has been added and enabled on the CentOS 7 system, check using the yum command Continue reading “Install and Secure Redis on CentOS 7” »

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Install Lancache on Debian 10

Step 1: 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: Continue reading “Install Lancache on Debian 10” »

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Large file split and join in linux

Let’s assume we have a large file of 102 GB and named as “vzdump-lxc-103-2021_07_19-12_05_06.tar.lzo”. We’d like to split this large file into 10GB of partial file. Let’s apply the split command as below-

split -b 102400M vzdump-lxc-103-2021_07_19-12_05_06.tar.lzo repo.

Wait for a while, the execution continues, and once over, you’ll find 11 split files altogether- Continue reading “Large file split and join in linux” »

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Install MongoDB on CentOS 7

Follow the steps below to install the latest stable version of MongoDB on your CentOS server :

Enabling MongoDB repository

To add the MongoDB repository to your system, open your text editor and create a new YUM repository configuration file named mongodb-org.repo inside the /etc/yum.repos.d/ directory:

nano /etc/yum.repos.d/mongodb-org.repo
[mongodb-org-4.0]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.0/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.0.asc

If you want to install an older version of MongoDB, replace each instance of 4.0 with your preferred version. Continue reading “Install MongoDB on CentOS 7” »

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CentOS 7 XFS disk resizing

Couldn’t find any article that explained step by step how to resize the main disks volume in a CentOS 7 vm. In my example I started witha single disk of 8GB and expanded to 20GB. I have two partitions on disk sda

sda1 type Linux for boot
sda2 type Linux LVM for the remaining logical volumes

Space utilisation as following:

[root@vcd-c1-s1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.8M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root 6.2G 1.9G 4.4G 31% /
/dev/sda1 1014M 179M 836M 18% /boot
tmpfs 783M 0 783M 0% /run/user/0

We basically need to: Continue reading “CentOS 7 XFS disk resizing” »

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