Linux – Rabin.IO

2018-07-10

Overwrite the default GTK theme per application

I love using a dark theme on my system, currently I’m running the Adapta theme. But not all applications looks great in dark themes, some need tweaking, this is a quick hack to overwrite...

Linux / SysAdmin

2018-05-08

Running Java GUI application in Docker

This is a more specific use case of running GUI application with Docker, the procedure is pretty simple (and most option are common for most GUI application), You mount the UNIX socket for the...

Linux

2018-04-09

Setup NAT with iptables

The Setup Having this setup where Machine A like to connect the Internet via Machine B.

+-------------------+          +-----------------+
|                   |          |  Machine B      |
|      Machine A    |          |  (the gateway)  |
|      (the client) |          |                 |
|                   |          |                 |
|              eth0 +----------+  eth0     eth1  |
+-------------------+          +-------------+---+
                                             |
                                             |
                     .-~~~-.                 |
             .- ~ ~-(       )_ _             |
            /                     ~ -.       |
           |        internet           \<----+
            \                         .'
              ~- . _____________ . -~

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+-------------------+ +-----------------+

| | | Machine B |

| Machine A | | (the gateway) |

| (the client) | | |

| | | |

| eth0 +----------+ eth0 eth1 |

+-------------------+ +-------------+---+

|

.-~~~-. |

.- ~ ~-( )_ _ |

/ ~ -. |

| internet \<----+

\ .'

~- . _____________ . -~

Add the following lines to the iptables

iptables -I FORWARD     -o eth0 -m comment --comment "NAT" -j ACCEPT
iptables -I FORWARD     -i eth0 -m comment --comment "NAT" -j ACCEPT
iptables -I POSTROUTING -o eth1 -m comment --comment "NAT" -j MASQUERADE -t nat

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iptables -I FORWARD -o eth0 -m comment --comment "NAT" -j ACCEPT

iptables -I FORWARD -i eth0 -m comment --comment "NAT" -j ACCEPT

iptables -I POSTROUTING -o eth1 -m comment --comment "NAT" -j MASQUERADE -t nat

and make sure to enable forwarding on Machine B...

Linux / Quick Tip

2018-03-20

GitKraken not loading in Fedora (libcurl.so.4 issue)

GitKraken is a very nice tool to work with git, it really simplify some of the common tasks which most users need to work with git, and the nice GUI is another plus. Long...

Linux

2017-05-21

Upgrading Fedora Installation on DigitalOcean

I found this method works for me,

#Check if user is root
if [[ $EUID -ne 0 ]]; then
    echo "Sudo privileges required!"
    exit 1;
fi

dnf update
NEXT_VERSION=25
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-${NEXT_VERSION}-$(uname -i)
dnf update dnf
dnf clean all
dnf --releasever=${NEXT_VERSION} distro-sync
# dnf remove firewalld-config-standard
# dnf install system-release-server

sync

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#Check if user is root

if [[ $EUID -ne 0 ]]; then

echo "Sudo privileges required!"

exit 1;

fi

dnf update

NEXT_VERSION=25

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-${NEXT_VERSION}-$(uname -i)

dnf update dnf

dnf clean all

dnf --releasever=${NEXT_VERSION} distro-sync

# dnf remove firewalld-config-standard

# dnf install system-release-server

sync

You may need to run restorecon -R / to fix any SELinux issues. Resource https://gist.github.com/kallisti5/01f6df3bfb77b978abfe

Linux

2016-01-07

Visualize real-time data streams with Gnuplot

Some times when I need to troubleshoot a problem, adding some visualization to the process can help a lot, especially if one need to correlate between 2 (or more) metrics in the data. But...

Linux

2015-11-08

Run Command Before Starting SSH Connection

This a quick hack I found while I was looking to run a knock script before connecting to servers which I have the SSH service protected with a knock sequence. In my setup I...

Linux

2015-08-27

Building CinelerraCV for Fedora 22 under Docker

The Dockerfile

#FROM 195a4b79eb1c
#Version 0.4

FROM Fedora-Docker-Base-22-20150521.x86_64
MAINTAINER rabin@rabin.io

RUN dnf update -y && dnf install -y mock rpmdevtools tmux htop && dnf clean all
RUN ["dnf", "install", "-y", "http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-22.noarch.rpm", "http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-22.noarch.rpm"]
RUN ["/usr/sbin/useradd", "-m", "builder"]

#ENTRYPOINT ["/usr/bin/su", "-", "builder"]

VOLUME ["/home/builder"]

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#FROM 195a4b79eb1c

#Version 0.4

FROM Fedora-Docker-Base-22-20150521.x86_64

MAINTAINER rabin@rabin.io

RUN dnf update -y && dnf install -y mock rpmdevtools tmux htop && dnf clean all

RUN ["dnf", "install", "-y", "http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-22.noarch.rpm", "http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-22.noarch.rpm"]

RUN ["/usr/sbin/useradd", "-m", "builder"]

#ENTRYPOINT ["/usr/bin/su", "-", "builder"]

VOLUME ["/home/builder"]

This Dockerfile will use Fedora Docker image (which you can download from any Fedora mirror server, and then use docker import to import the image) as the base for our builder image,...

Linux

2015-08-15

[NetworkManager] Using dispatcher.d to run scripts based on network connectivity

This post is based on my personal need to mount/umount some network shares automatically when I’m switching between networks (e.g Homer/Office). Later on I was looking to make it more modular and came out...

Linux

2014-11-24

Setup Xdebug for remote debug over SSH

If you have PHP application you need to debug, and there is a firewall between you and the hosting server, One can use SSH to tunnel the traffic from the remote site to the...

Category: Linux