Specify Different Certificates To Access Different Git Repositories

Besides HTTPS, we can make a connection to a Git repository using SSH. For authentication, we should store our public key on the remote host, and set the remote Git URL on our host to the correct address for SSH connection. For example:

git remote set-url myremote ssh://git@myremotegit.com/myrepo.git

Common SSH client tools provide a specific parameter to set which private key should be used for authentication. For example, the OpenSSH client provides -i parameter to specify the location of the private key that will be used. Meanwhile, common Git client tools may not provide it. When we run a Git command, the tool will look for a private key stored in the default directory which is ~/.ssh/id_rsa. We can resolve this issue by setting up a configuration file that will be stored in ~/.ssh/config. For instance, this is a sample of a configuration file.

Host myremotegit
  HostName myremotegit.com
  User git
  IdentityFile C:\\keys1\\id_rsa
  IdentitiesOnly yes

Host bitbucket-com
  HostName bitbucket.com
  User git
  IdentityFile C:\\keys2\\id_rsa
  IdentitiesOnly yes

We set the Host parameter into a custom name while HostName is the actual address of the host. Then, we can set the remote Git URL using the custom name. This method will make any SSH client including Git client read the ~/.ssh/config file before they can establish an SSH connection. For example:

git remote set-url myremote ssh://git@myremotegit/myrepo.git

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Deploying a Web Server on UpCloud using Terraform Modules

In my earlier post , I shared an example of deploying UpCloud infrastructure using Terraform from scratch. In this post, I want to share how to deploy the infrastructure using available Terraform modules to speed up the set-up process, especially for common use cases like preparing a web server. For instance, our need is to deploy a website with some conditions as follows. The website can be accessed through HTTPS. If the request is HTTP, it will be redirected to HTTPS. There are 2 domains, web1.yourdomain.com and web2.yourdomain.com . But, users should be redirected to "web2" if they are visiting "web1". There are 4 main modules that we need to set up the environment. Private network. It allows the load balancer to connect with the server and pass the traffic. Server. It is used to host the website. Load balancer. It includes backend and frontend configuration. Dynamic certificate. It is requ...

Rangkaian Sensor Infrared dengan Photo Dioda

Keunggulan photodioda dibandingkan LDR adalah photodioda lebih tidak rentan terhadap noise karena hanya menerima sinar infrared, sedangkan LDR menerima seluruh cahaya yang ada termasuk infrared. Rangkaian yang akan kita gunakan adalah seperti gambar di bawah ini. Pada saat intensitas Infrared yang diterima Photodiode besar maka tahanan Photodiode menjadi kecil, sedangkan jika intensitas Infrared yang diterima Photodiode kecil maka tahanan yang dimiliki photodiode besar. Jika tahanan photodiode kecil maka tegangan V- akan kecil . Misal tahanan photodiode mengecil menjadi 10kOhm. Maka dengan teorema pembagi tegangan: V- = Rrx/(Rrx + R2) x Vcc V- = 10 / (10+10) x Vcc V- = (1/2) x 5 Volt V- = 2.5 Volt Sedangkan jika tahanan photodiode besar maka tegangan V- akan besar (mendekati nilai Vcc). Misal tahanan photodiode menjadi 150kOhm. Maka dengan teorema pembagi tegangan: V- = Rrx/(Rrx + R2) x Vcc V- = 150 / (1...

Configuring Swap Memory on Ubuntu Using Ansible

If we maintain a Linux machine with a low memory capacity while we are required to run an application with high memory consumption, enabling swap memory is an option. Ansible can be utilized as a helper tool to automate the creation of swap memory. A swap file can be allocated in the available storage of the machine. The swap file then can be assigned as a swap memory. Firstly, we should prepare the inventory file. The following snippet is an example, you must provide your own configuration. [server] 192.168.1.2 [server:vars] ansible_user=root ansible_ssh_private_key_file=~/.ssh/id_rsa Secondly, we need to prepare the task file that contains not only the tasks but also some variables and connection information. For instance, we set /swapfile as the name of our swap file. We also set the swap memory size to 2GB and the swappiness level to 60. - hosts: server become: true vars: swap_vars: size: 2G swappiness: 60 For simplicity, we only check the...

Several Useful Linux Tools

The following tools may have been installed in your Linux because some are basic tools. But, if we installed any Linux distribution from the Docker registry which is shipped with only minimal programs, these following tools may be not available by default. net-tools This tool provides tools for network-related tasks such as ifconfig . software-properties-common If you want to enable add-apt-repository command, this tool is required. nano This text editor is usually already available. ca-certificates A deb package that contains certificates provided by the Certificate Authorities. It also contains an updater tool that can be used as a cronjob if needed. gnupg2 GNU Privacy Guard is GNU's tool that can be used to encrypt data and to create digital signatures. GnuPG is a complete replacement for PGP. It includes an advanced key management facility and is compliant with the proposed OpenPGP Internet standard. openssh-client Tools for generating authentication keys and...

Installing VSCode Server Manually on Ubuntu

I've ever gotten stuck on updating the VSCode server on my remote server because of an unstable connection between my remote server and visualstudio.com that host the updated server source codes. The download and update process failed over and over so I couldn't remotely access my remote files through VSCode. The solution is by downloading the server source codes through a host with a stable connection which in my case I downloaded from a cloud VPS server. Then I transfer the downloaded source codes as a compressed file to my remote server through SCP. Once the file had been on my remote sever, I extracted them and align the configuration. The more detailed steps are as follows. First, we should get the commit ID of our current VSCode application by clicking on the About option on the Help menu. The commit ID is a hexadecimal number like 92da9481c0904c6adfe372c12da3b7748d74bdcb . Then we can download the compressed server source codes as a single file from the host. ...

Enabling Imagick to Read or Manipulate PDF File

Imagick is one of the popular tools for manipulating image files. Some popular languages such as PHP and Node.js have provided libraries that can be used for manipulating images based on Imagick. One of the common use cases for using Imagick is for generating a thumbnail from an image or PDF file. In PHP, we can install the PHP Imagick module by running the following command. apt install php-imagick Then, we can verify the installation by running this command. php -m | grep imagick For example, we want to generate a thumbnail image for a PDF file in PHP. We can use the following script. <?php $im = new Imagick(); $im->setResolution(50, 50); // set the reading resolution before read the file $im->readImage('file.pdf[0]'); // read the first page of the PDF file (index 0) //$im = $im->flattenImages(); // @deprecated // handle transparency problem $im = $im->mergeImageLayers( Imagick::LAYERMETHOD_FLATTEN ); $im->setImageFormat('png'); $im->write...

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