Add Geolocation to Graylog 2

August 16, 2020 by Rumi

The Graylog Map Widget is the plugin providing geolocation capabilities to Graylog. The plugin is compatible with Graylog 2.0.0 and higher, and it is installed by default, although some configuration is still required on your side. This section explains how to configure the plugin in detail.

In case you need to reinstall the plugin for some reason, you can find it inside the Graylog tarball in our downloads page. Follow the instructions in Installing and loading plugins to install it.

Configure the database

In first place, you need to download a geolocation database. We currently support MaxMind City databases in the MaxMind DB format, as the GeoIP2 City Database or GeoLite2 City Database that MaxMind provides.

The next step is to store the geolocation database in all servers running Graylog. As an example, if you were using the Graylog OVA, you could save the database in the /var/opt/graylog/data folder, along with other data used by Graylog. Make sure you grant the right permissions so the user running Graylog can read the file. Continue reading “Add Geolocation to Graylog 2” »

Installation Bashtop an upgraded CLI system reporting interface from Top or Htop

August 15, 2020 by Rumi

Install Bashtop Resource Monitor on Ubuntu

You can use PPA repository for Ubuntu Linux installations:

sudo add-apt-repository ppa:bashtop-monitor/bashtop
sudo apt update
sudo apt install bashtop

Install Bashtop Resource Monitor on Debian

For Debian and its based distributions, used the commands below: Continue reading “Installation Bashtop an upgraded CLI system reporting interface from Top or Htop” »

Install Discourse Forum with Nginx on Ubuntu 16.04

June 26, 2020 by Rumi

Step 1 – Install Docker on Ubuntu 16.04

The Discourse software is written in Ruby and Javascript, using PostgreSQL as the main database, and Redis as a cache and for transient data. We will install Discourse under the Docker container.

The installation process will be carried out on Ubuntu 16.04. So to begin with, install Docker using the command below.

wget -qO- https://get.docker.com/ | sh

After the installation is complete, check the docker service and make sure it’s already running on the system. Continue reading “Install Discourse Forum with Nginx on Ubuntu 16.04” »

Emby Load Balancing using Nginx

May 26, 2020 by Rumi

Emby is a nice and excellent low resource hungry media server. However if you have substantially high amount of traffic, you need a load-balancer.

A sample Nginx based load balancing configuration as below might help. Continue reading “Emby Load Balancing using Nginx” »

Extend/Reduce LVM’s (Logical Volume Management) in Linux

March 15, 2020 by Rumi

My Server Setup – Requirements

Operating System – CentOS 6.5 with LVM Installation
Server IP – 192.168.0.200

How to Extend Volume Group and Reduce Logical Volume

Logical Volume Extending

Currently, we have One PV, VG and 2 LV. Let’s list them one by one using following commands.

# pvs
# vgs
# lvs

Logical Volume Extending

Continue reading “Extend/Reduce LVM’s (Logical Volume Management) in Linux” »

Endian Installation USB Flash Drive

December 25, 2019 by Rumi

This lesson describes how to create an installation USB drive for image files provided by Endian and to verify the integrity of the image file. The procedure applies to Windows users with XP, Vista, or Windows7 systems.

Requirements

You need the following to complete this lesson:

.iso or .img image of an Endian Appliance.
md5sum of the image.
An USB Stick.

Warning
Some USB sticks may not work with Endian devices. In particular, some Endian hardware device might fail to recognise USB Sticks with size bigger the 2Gb. so you should try with one USB stick with smaller size.

Note: ISO image files
Starting with release 5.0, Endian releases installation images as .iso file, rather than .img. However, the following procedure and suggested software can be used also with .iso files.

It is assumed that you have an Endian image file and its correspondent md5sum checksum on your computer. This lesson takes as example an image of an edge 3.0 and its correspondent md5sum file saved in C:\:

In order to create the Endian installation USB flash drive you need to download an application that allows to burn img and iso images to USB flash drives disks, like win32 Disk Imager. Continue reading “Endian Installation USB Flash Drive” »

Zimbra GUI Customization- Logo, Title, Footer

October 25, 2019 by Rumi

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

Basic Email Server with Postfix, Dovecot and Squirrelmail on CentOS 6

August 8, 2019 by Rumi

Step 1 »Before installation assign a static ip and add a host entry for your domain to that IP in the /etc/hosts file like below.

192.168.0.15 tweenpath.net

Step 2 » Issue the below command to install postfix

[root@mail ~]# yum -y install postfix

Step 3 » Now issue the below command to install SMTP AUTH packages .

[root@mail ~]# yum -y install cyrus-sasl cyrus-sasl-devel cyrus-sasl-gssapi cyrus-sasl-md5 cyrus-sasl-plain

Postfix package installation is completed .

Step 4 » Issue the below commands one by one for creating SSL Cert.

[root@mail ~]# mkdir /etc/postfix/ssl
[root@mail ~]# cd /etc/postfix/ssl/
[root@mail ssl]# openssl genrsa -des3 -rand /etc/hosts -out smtpd.key 1024
[root@mail ssl]# chmod 600 smtpd.key
[root@mail ssl]# openssl req -new -key smtpd.key -out smtpd.csr
[root@mail ssl]# openssl x509 -req -days 365 -in smtpd.csr -signkey smtpd.key -out smtpd.crt
[root@mail ssl]# openssl rsa -in smtpd.key -out smtpd.key.unencrypted
[root@mail ssl]# mv -f smtpd.key.unencrypted smtpd.key
[root@mail ssl]# openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 365

Step 4 » Now open /etc/postfix/main.cf file Continue reading “Basic Email Server with Postfix, Dovecot and Squirrelmail on CentOS 6” »

Xcode on my Mac Sierra (10.12.6)

March 14, 2019 by Rumi

You can get the correct version here at this URL:

https://developer.apple.com/download/more/

to download a your version of Xcode you want. Specifically, get 9.2.1. This is the recent version that works with mac OS Sierra.

Alternatively, this link works good too-

https://xcodereleases.com/

DNS UDP Load Balancer using Nginx

June 14, 2018 by Rumi

The plan is to build a DNS- UDP load balancer DNS recursive server (actually forwarding service). The design logic is simple-

On client side a public recursive+forwarding DNS IP –> hits the Nginx Load Balancers –> sends traffic to Google Public DNS/IBM Public DNS/Own recursive DNS/OpenDNS.

The configuration is quite simple on Nginx Load Balancer, the core configuration content is pretty straight forward:

# Load balance UDP-based DNS traffic across two servers
stream {
upstream dns_upstreams {
server 192.168.136.130:53;
server 192.168.136.131:53;
}

server {
listen 53 udp;
proxy_pass dns_upstreams;
proxy_timeout 1s;
proxy_responses 1;
error_log logs/dns.log;
}
}

Continue reading “DNS UDP Load Balancer using Nginx” »

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Category Archives: Networking