Method 1: Using x11vnc Connect to remote computer with SSH
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ssh user@REMOTE_PC_IP |
Install x11vnc
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sudo apt install x11vnc |
start x11vnc as the user that is logged in to GUI.
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x11vnc -display :0 |
Now you should be able to connect to the desktop using any vnc client software using
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REMOTE_PC_IP:0 |
Method 2: Using vino Connect to remote computer with SSH
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ssh -Y user@REMOTE_PC_IP |
Run […]
PowerDNS is an OpenSource DNS server. Update apt repo
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apt-get update && apt-get upgrade -y |
On Ubuntu, systemd-resolved listen to port 53. This is a local DNS resolver, we need to stop this service before we can install PowerDNS.
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systemctl disable systemd-resolved systemctl stop systemd-resolved rm -f /etc/resolv.conf echo "nameserver 1.1.1.1" > /etc/resolv.conf echo "nameserver 8.8.8.8" >> /etc/resolv.conf |
To install PowerDNS with MySQL backend, run
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apt install pdns-server pdns-backend-mysql |
Since we are using MySQL backend to store DNS zones, we need […]
On Ubuntu, some times notifications steal focus from current application. This annoying when you are working on terminal. This is due to start focus feature of gnome when your mouse is over the notification area.
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boby@sok-01:~$ gsettings get org.gnome.desktop.wm.preferences focus-new-windows 'smart' boby@sok-01:~$ |
We need to change the value of focus-new-windows from smart to strict. This can be done with command
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gsettings set org.gnome.desktop.wm.preferences focus-new-windows 'strict' |
[…]
On Ubuntu/Debian server, apache run as user www-data. When you install Apache web server on your local computer for developement purpose, it may be easier to run Apache as your user. If you run Apache as www-data user, you will need to chmod folders 777 for yoru web application to write to a folder like […]
To install wireguard VPN on ubuntu, run
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apt update apt install software-properties-common apt install linux-headers-$(uname -r) add-apt-repository ppa:wireguard/wireguard apt-get update apt-get install wireguard |
Generate Keys
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cd /etc/wireguard umask 077 wg genkey > privatekey cat privatekey | wg pubkey > publickey |
Configure wireguard You can generate wireguard configuration using https://www.wireguardconfig.com […]
On my local computer, i have installed openssh-server, but i don’t want it always enabled. To disable openssh-server from auto start on boot, run
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systemctl disable ssh |
Example
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root@lab:~# systemctl disable ssh Synchronizing state of ssh.service with SysV service script with /lib/systemd/systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install disable ssh Removed /etc/systemd/system/sshd.service. Removed /etc/systemd/system/multi-user.target.wants/ssh.service. root@lab:~# |
If you want to start ssh server on boot, run systelctl enable ssh
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root@lab:~# systemctl enable ssh Synchronizing state of ssh.service with SysV service script with /lib/systemd/systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install enable ssh Created symlink /etc/systemd/system/sshd.service → /lib/systemd/system/ssh.service. Created symlink /etc/systemd/system/multi-user.target.wants/ssh.service → /lib/systemd/system/ssh.service. root@lab:~# |
See Ubuntu […]
First you need to add VirtualBox repository
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sudo echo "deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian bionic contrib" > /etc/apt/sources.list.d/virtualbox.list |
Add Keys
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wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add - wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add - |
Do an apt upgrade
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sudo apt-get update |
If you have older version of VirtualBox installed, remove it
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sudo apt remove virtualbox virtualbox-dkms virtualbox-qt |
Install VirtualBox 6.1 with
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sudo apt-get install virtualbox-6.1 |
If you use Vagrant, you may need to install latest version as the vagrant provided by ubuntu won’t work with VirtualBox 6.1 […]
When connecting to Ubuntu 20.04 server using SSH from a Mac computer, get an error
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kex_exchange_identification: read: Connection reset by peer |
On checking the servers log file (/var/log/auth.log), found the following error message
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Jul 23 06:53:34 server sshd[24147]: Unable to negotiate with 17.19.44.24 port 47280: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth] |
To fix this, on the server, edit sshd_config
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vi /etc/ssh/sshd_config |
At end of the file, add
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KexAlgorithms +diffie-hellman-group1-sha1 |
Restart ssh
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systemctl restart ssh |
See SSH […]
Ubuntu come with screen recorder, this can be activated with shortcut
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CTRL + ALT + SHIFT + R |
By default, it will record for 30 seconds. Video get saved in your home directory (/home/USERNAME) in webm format. If you want to increase time, you can run following command
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gsettings set org.gnome.settings-daemon.plugins.media-keys max-screencast-length TIME_IN_SECONDS_HERE |
It is better to set this to 0, this way record never […]
To install LAMP (Apache, MySQL, PHP) on Ubuntu/Debian web server, run
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apt-get install lamp-server^ |
This use meta package install LAMP. If you want to remove, don’t remove the meta package as it will remove many other required packages. You need to remove packages one by one. Related Posts Apache MySQL […]