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cloud engineer

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Running Top by Process

Here’s how to isolate a process via the top command.

top -c -p $(pgrep -f process_name | head -20 | tr "\\n" "," | sed 's/,$//')

Terraform in a Docker Container

Run Terraform in a Docker container.

docker run --rm -it --name terraform -v ~/.aws:/root/.aws -v $(pwd):/workspace -w /workspace hashicorp/terraform:latest

Create an alias.

alias terraform='docker run --rm -it --name terraform -v ~/.aws:/root/.aws -v $(pwd):/workspace -w /workspace hashicorp/terraform:latest'

Run the command

terraform --version
Terraform v1.0.2
on linux_amd64

GCloud in a Docker Container

You can run a gcloud commands in a Docker container.

docker run -ti --name gcloud-config google/cloud-sdk gcloud auth login

Create an alias.

alias gcloud='docker run --rm -ti --volumes-from gcloud-config google/cloud-sdk:latest gcloud'

Run the command.

gcloud --version
Google Cloud SDK 348.0.0
alpha 2021.07.09
app-engine-go 1.9.71
app-engine-java 1.9.90
app-engine-python 1.9.93
app-engine-python-extras 1.9.93
beta 2021.07.09
bigtable 
bq 2.0.70
cbt 0.10.0
cloud-datastore-emulator 2.1.0
cloud-firestore-emulator 1.13.0
cloud-spanner-emulator 1.2.0
core 2021.07.09
datalab 20190610
gsutil 4.65
kpt 0.39.3
local-extract 1.2.0
pubsub-emulator 0.4.1

Create one for gsutil.

alias gsutil='docker run --rm -ti --volumes-from gcloud-config google/cloud-sdk:latest gsutil'

CloudFormation Userdata

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

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

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

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

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