In this example, I am using POP OS but you can us Debian/Ubuntu etc. With Debian you need a little bit of tweaking, for Ubuntu and POP OS, it should work. Step 1: Install xrdp package using the following command bchoi@pop-os:~$ sudo apt install xrdp -y Step 2: Enable xrdp so the daemon starts on… Read More How to allow RDP (remote desktop) access to Ubuntu/POP OS (Debian) from Windows – XRDP method
Learn Python in one day, smells like rotten fish, looks like bull’s dung, reads like snake oil Python has been gaining popularity over the past ten years, and it is genuinely a simple language to enter the computer programming for newbies. Many of my colleagues at work ask me how to begin study Python (self-study). And… Read More Learn Python in one day, smells like rotten fish, looks like bull’s dung & reads like snake oil
Update configuration of /etc/ssh/sshd_config file. [bchoi@ansible-server ~]$ sudo nano /etc/ssh/sshd_config[sudo] password for bchoi: 2. Update “PermitRootLogin” from this: PermitRootLogin prohibit-password To this: PermitRootLogin yes 3. Restart sshd for change to take effect.[bchoi@ansible-server ~]$ service sshd restartRedirecting to /bin/systemctl restart sshd.service==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ====Authentication is required to restart ‘sshd.service’.Authenticating as: bchoiPassword:==== AUTHENTICATION COMPLETE ==== Only… Read More Enable root ssh login (in Lab environment only for testing)
Check the default runlevel configured on the system [root@ansible-server system]# ls -l /etc/systemd/system/default.targetlrwxrwxrwx. 1 root root 40 Jan 28 07:11 /etc/systemd/system/default.target -> /usr/lib/systemd/system/graphical.target 2. update the graphical.target to multi-user.target runlevel. ‘ln’ is command for making link files. [root@ansible-server system]# ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target 3. Check the updated configuration[root@ansible-server system]# ls -l /etc/systemd/system/default.targetlrwxrwxrwx. 1 root root… Read More Linux – change default system runlevel from 6 to 3
You can shutdown a Linux sytem using ‘init 0’ or reboot the system using ‘init 6’. The number followed by init is called RunLevel and Linux operates in 7 RunLevels. RunLevel Mode Explanation comment 0 Power Off Shuts down system 1 Rescue System recovery mode Single user mode 2 Multi-User Not in use 3 Multi-User… Read More Linux RunLevel 0 – 6
https://hackertarget.com/nmap-cheatsheet-a-quick-reference-guide/ Nmap Commands to Scan Remote Hosts Command Explanation 1 sudo nmap 10.10.10.1 nmap google.com scan a host scan a web site *2 sudo nmap 192.168.30.201 –p 1-65535 sudo nmap 192.168.30.201 -p 22,69,80,443 scan specific ports 3 sudo nmap 10.10.10.11 192.168.30.202 sudo nmap 192.168.30.11,201,202 scan multiple Ips 4 CIDR sudo nmap -p 8.8.8.0/28… Read More Useful nmap port scan commands
As you work with the IP addresses this will come in handy. Here is endswith methods: Result:The last octet is: .1The last octet is neither .0 or .1The last octet is: .0The last octet is neither .0 or .1The last octet is: .1The last octet is: .0 You can also do something like this to… Read More Check if string ends with specific characters
I have been test driving Ansible for 2-3 weeks now and slowly getting the hang of the ad-hoc, playbooks, yaml, jinja2 files etc. I now want to peek through the Ansible modules which runs the Ansible as what it is. We all know the modules are mostly written in Python. So, let’s see where they… Read More Ansible – where’s ansible python modules?
https://docs.ansible.com/ansible/2.5/dev_guide/developing_modules_best_practices.html Giving Ansible the –vvv option makes Ansible more verbose. That way it prints the file name of the temporary module file for you to see. If you want to examine the wrapper file you can. It will show a small python script with a large, base64 encoded string. The string contains the module that… Read More Ansible study note 13. ansible-playbook – debugging and locating playbook problems using -vvv
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