Other

Usually this issue happens when you have a virtual machine with minimal specs.then, you need to extend some partitions whichever partition type primary, logical ,or LVM partition. This article explains how to resize any Linux partitions specially root partition without restart.

In this scenario we expects that you increased the size of the Virtual machine instead of adding new disk. After changing the Disk size by following the virtualization software

Increase Virtual machine disk size

The detailed steps can differ from tool to another. however, you will achieve you objective by following these general steps:

1. Open Virtual machine properties.
2. Navigate to Disk / Storage section.
3. Increase the disk size

If you seem to be lost follow the instructions mentioned here for VMware or here for VirtualBox.

Re-scan disk information without restart.

Operating system scan the hardware on startup. so restarting the machine will make OS detect the changes. However, in many cases restarting or powering off the OS is not an option. There for we will instruct it to reread the disk information. To scan the disk information without restart

echo 1>/sys/class/block/sda/device/rescan

Now, we can confirm that Linux has detected the new size. List partition information by executing lsblk command the output should be like the following image

Linux partition resize using parted

In Linux, there are many powerful tools for disk partitioning. We will use parted a modern tool which provide user friendly interaction which is parted. As the famous fdisk is a bit risky. It easy to resize the partition despite its type Physical Volume. use parted command

It might ask you to update disk GPT table to fix size mismatch, Fix it. 

Then, resize the partition (in our example sda3)

List disk information

lsblk

use partition editing software to extend the partition 

This example uses parted that comes with OS.

parted

# List disk information and list partition details

print free

To extend the size of this partition 

resizepart 3 100%free

in this example partition number 3 holds is physical volume of our LVM and 100% is the percentage of free space to add to partition

quit the application

List partition information

pvresize /dev/sda3

pvscan

lvextend -n -l +100%free /dev/os/root 

Increase XFS File System

XFS is a 64-bit journaling file system. It support parallel I/O based on allocation groups. to update the XFS system with the new size without restarting the OS just execute the following command

xfs_growfs /dev/centos_lnxsrv01/root 

Increase Ext3/ Ext4 File System

resize2fs /dev/centos_lnxsrv01/root

Finally, after updating the file system. check the disk free space to confirm the changes.

df -Th

to summarize, In this article we increased root par

When I use vscode remote explorer to connect to remote servers to read long configuration files. or investigate/search for configuration in a system, software, or solution that has no information about. I face files navigation limitations due to the limited user which I use it to connect to the server is limited. This article explains how to elevate vscode and allow it to connect to remote host as root with sudo

This will allow vscode to work on the remote host as root.

Remote host sudo user.

The user you connect to should have sudo without password in my example username is ansible

Connect to the remote host then create a file in /etc/sudoers.d/ or update the main file using visudo

• Add to /etc/sudoers.d/admin

ansible ALL=(ALL:ALL) NOPASSWD:ALL 

• Then change permission to 0440

chmod 0440 /etc/sudores/admin

• Verify sudo setting by typeing

visudo -c

vscode-Server directory structure

now when you connect to the remote host with vscode for the first time, It creates a hidden directory inside the user’s home directory named vscode-server where it installs vscode-server binaries and configuration inside it.

Next, it creates a sub-directory with unique ID related to your vscode editor inside the vscode-server direcotry. Then, It starts an instance of vscode-server and terminate it when you disconnect

This unique identifier is related to the client you connect from. For example, I connect from two workstations, therefore I have two directories.

Configure vscode with sudo

After you connect to the server

find which client ID you are using by typing ps command

navigate into ~/.vscode-server/bin

List the content to detect latest updated directory

Edit the server.sh which is located inside clientID directory

Add sudo in the begining of the last line

Conclusion, Now when you connect using vscode to the remote host, you will find you self connected with sudo privliges and vscode Terminal will show as root user with full priviliges.

Implementing a reverse proxy servers usually for many reasons. For example, enable load-balancing, high availability, improved performance, and enhanced security. So, This article explains the what is it, how it works. Then, explain the advantage and disadvantages of having it in your architecture.

What is it ? how it works ?

Basically, a Reverse proxy works as an Interface or bridge between the Internet and your web-based services. in other words, instead of exposing many servers to internet, you will exposing one server.

Famous Reverse proxies.

notably, there are many reveres proxy in the marker. nevertheless, It falls back to your environment needs which type you will need.

• HAPROXY.
  A pioneer proxy server known for its efficiency as load balancer for TCP and HTTP-based applications. It has afree version. nevertheless, the paid one (Enterprise version) provides many features like high availablity, Layer 7 load-balancing, Security feautres.
• Nginx.
  A known as high-performance web server. furthermore, It provides reverse proxy feature, caching and, load balancing.
• Microsoft IIS .
  IIS is usually known as webserver. nevertheless, it can work as reverse proxy after enabling some addons. to demonstrate, These serios of articles shows how to setup configure IIS as reverse proxy

Why use Reverse Proxy ( Advantages )?

indeed, Having Reverse proxy in your architecture is highly recommended. as it gives you the opportunity to

• Monitor, analayis, and control web Traffic to your servers.
• Apply security features.
• Provide Load balancing.
• SSL offloading.
• Protect your servers from internet (Only proxy need to be exposed to internet).
• Enable Caching and reduce load on your webservers.
• Reduce Administrative tasks related to websites rules and subdomains.
• consolidate their internet presence as all servers exposed to internet through single IP or servers.
• Allow you consolidate or Customize error pages for whole services.

Reverse Proxy disadvantages

indeed, The use of a Reverse proxy adds an additional layer of complexity to your network architecture. . The following are the disadvantages or the obstacles you might face while having it in your architecture.

• Enabling security cloud block your applications.
• Apps compatibilty with proxy.
• SSL offloading Apps compatibilty .
• Web-Application auditing related issues like client IPs.
• Developers hard coding.
• Redundent headers in Proxy and Backend Server.
• All eggs in one basket (Single point of failure).

Conclution

altogether, having a reverse proxy in your environment will positively impact your environment. After all, the pros outweigh the cons.