Uly.me

cloud engineer

run

CloudFormation Userdata

by ·

Here’s another way to add startup scripts to your instance during creation.

      UserData:
        Fn::Base64: !Sub |
          #cloud-config
          repo_upgrade: none
 
          runcmd:
            # Cloud init startup script
            - "bash /root/setup.sh"
 
          write_files:
            # Cloud init startup script
            - owner: root:root
              permissions: '0644'
              path: /root/setup.sh
              content: |
                #! /bin/bash -x
          write_files:
            # Cloud init startup script
            - owner: root:root
              permissions: '0644'
              path: /root/setup.sh
              content: |
                #! /bin/bash -x
                # run your bash commands here
                date > log.txt
                uptime >>  log.txt

The above script creates a file setup.sh and executes it during instance creation. The output is dumped to log.txt file.

Running MySQL commands from the Terminal

by ·

You can run MySQL commands from the terminal by using -e switch. Here are a few examples.

mysql -u username -p -e "create database mydb"
mysql -u username -p -e "use mydb"
mysql -u username -p database -e "select * from mytable"

If you have .mycnf configured, you can omit the username and password.

mysql -e "create database mydb"
mysql -e "use mydb"
mysql -e "select * from mytable"

To run multiple commands from a single line, separate the commands using a semicolon.

mysql -e "create database somedb; use mydb; select * from mytable;"

Run Ansible Playbook

by ·

Here’s the command to run the Ansible playbook.

ansible-playbook -t hosts playbook.yml

Or simply run it like this.

ansible-playbook playbook.yml

Apache Dockerfile

by ·

This Docker image contains Apache (httpd), a web server.

Here’s the Dockerfile.

FROM httpd:2.4
COPY ./public-html/ /usr/local/apache2/htdocs/

Build and run your Docker image.

docker build -t my-app .
docker run -dit --name my-running-app -p 8080:80 my-app

Visit http://localhost:8080 to view your app.

Run Shell Script From Your Website

by ·

Here’s how to run a shell script from your website. You’ll need 2 files.

Here’s the contents of foo.php. Wrap your output with ‘pre’ for better formatting.

<?php
$output = shell_exec('/var/www/html/bar.sh 2>&1');
echo "$output";

Here’s the content of bar.sh. Output will be displayed on web page.

#!/bin/bash
now="$(date +'%y%m%d')"
echo $now
aws s3 ls

Icecast on Docker

by ·

Run Icecast2 on a Docker container.

docker run -d \
-p 8000:8000 \
-e ICECAST_SOURCE_PASSWORD=aaaa \
-e ICECAST_ADMIN_PASSWORD=bbbb \
-e ICECAST_PASSWORD=cccc \
-e ICECAST_RELAY_PASSWORD=dddd \
moul/icecast

Access localhost:8000 on browser. Github.

Run Bash Script in GitBash

by ·

Unfortunately, you can’t run Bash scripts in GitBash the normal way. Here’s the workaround. You have to use sh script.sh

# Normal use
./script.sh
# Running it in GitBash
sh script.sh