How to restart a service running in docker compose

I’m playing with docker-compose for a test Flask app. My docker-compose.yml looks like this: I noticed any change I made in my files within my templates folder did not take effect when I reloaded the browser locally at localhost:5000 So, I found that I can just restart the ‘www’ service defined on my docker-compose.yml file …

Connect to a remote MySQL database using Linux terminal

This is simple. After you setup a user with proper access rights run the below commands. # mysql -u yourUser -p -h <yourHostname or IP> A little explanation: -u tells mysql what your username -p tells mysql you have a password and will prompt you to enter it after you press enter -h tells mysql …

Restart sound service in Ubuntu

The other day my sound stopped working on Ubuntu 18.04 desktop. I have no clue why. The sound stopped working overnight for some reason. After some research I found the below command to restart the sound service on Ubuntu: pulseaudio -k && sudo alsa force-reload All works now! Give it a try and let me …

Minicom error “Device /dev/ttyS0 is locked”

Sometimes if the connection to a device via Minicom is lost, the next time you start Minicom you could see an error: Device /dev/ttyS0 is locked. The name /dev/ttyS0 may be different, depending on your COM port. To avoid this issue you should always shut down Minicom using CTRL+A keys and then the Q key. …

How to run Ansible when Python not installed on Ubuntu EC2

I started an Ubuntu EC2 the other day hoping to run Ansible on it and was surprised that Python was not installed. A requirement for Ansible to run on target machines is to have a modern version of Python. You can just run sudo apt install python but this is not ideal if you need …

Breaking Up Long Lines in Your Dockerfile

I try to limit my line characters to 79-80 per line. For example check this 122 character multi-command line: RUN wget -O afile.tar.gz http://example.com/afile.tar.gz && tar -xvf afile.tar.gz -C /usr/src/myapp && rm afile.tar.gz You will need to scroll horizontally using your text editor to see the super long crazy line. This is not efficient and …

Using .gitignore examples

A .gitignore file is a plain text file where each line contains a pattern for files/directories to ignore. Normally, this is placed in the root directory of your repository. This is the recommended way. The patterns in the .gitignore file are relative to the location of the file. File names Easiest pattern is a literal …

GREP command overview

The grep command means Global Regular Expression Print. This Linux command is one of the most useful commands out there. Below are some basic examples: grep ‘word’ filenamegrep ‘word’ filename1 filename2 filename3grep ‘string1′ string2’ filenamecat filename | grep ‘something’command | grep ‘something’ Next example, you can search for the user ‘tom’ in the Linux passwd …

How to change the default SSH port in MacOS using Terminal

This is simple. Open a terminal and follow the steps below. This worked for me on MacOS 10.13.6 Open the Terminal. Run sudo vim /etc/services Enter your password Find the lines assigned to port 22, something like the image below Replace both ports 22 with your desired ssh port using a number between 1024 and …