Uly.me

cloud engineer

Archives for August 2022

Jekyll on Docker Container

Here’s how to run Jekyll in a Docker container.

mkdir blog
cd blog
docker run -v $(pwd):/site bretfisher/jekyll new .
docker run -p 4000:4000 -v $(pwd):/site bretfisher/jekyll-serve

Another option is to use docker compose. Create a docker-compose.yml file.

version: 3.5
services:
  jekyll:
    image: bretfisher/jekyll-serve
    volumes:
      - .:/site
    ports:
      - '4000:4000'

Run Jekyll.

cd blog
docker-compose up -d

Stop Jekyll.

cd blog
docker-compose down

Cleanup Stale CVS Snapshots

Here’s the script that looks mounts with stale file handles and removes them.

#!/bin/bash
file='/tmp/stale.txt'
df -h | grep Stale > $file
sed -i -e 's/df: ‘/'""'/g' $file
sed -i -e 's/’: Stale file handle/'""'/g' $file
while IFS= read -r line; do
  echo 'unmounting '$line
  umount $line
done < $file

Cleanup CVS Snapshot Volumes

How to unmount CVS snapshot volumes all at once using a Bash script. I ran into a scenario where I had to unmount 115 volumes. Instead of manually running umount on each one, I use the script below to unmount all 115 volumes. The script performs a grep for ‘.snapshot’ and then writes the results to a file. I then read the file line by line and perform unmount on each one.

#!/bin/bash
file='/tmp/snapshots.txt'
df -h | grep .snapshot | awk '{print $6}' > $file
while IFS= read -r line; do
  echo 'unmounting '$line
  umount $line
done < $file

Editors on Terminal

How to run editors from the Terminal.

Sublime, Visual Studio Code, Atom and Bluefish examples.

Open from the current directory.

subl .
code .
atom .
bluefish .

Open editor using path and file.

subl /etc/hosts
code /etc/hosts
atom /etc/hosts
bluefish /etc/hosts

Copy Directory Structure

Here’s how to copy a directory structure from one directory to another without the files.

Copy directory structure of DIR1 to DIR2.

find /DIR1 -type d > /tmp/dirs.txt
sed -i 's/DIR1/DIR2/' /tmp/dirs.txt 
xargs mkdir -p < /tmp/dirs.txt
chown -R USER:GROUP /DIR2