Techtronic

Common Docker Commands

January 17, 2017February 27, 2017 Timothy StewartNo Comments

Over the last few months I have used Docker more and more. Sometime things go my way, sometimes they don’t. When they don’t, I usually have to Google the command I need to run to get back on track. I decided to compile a list of common Docker commands to solve various issues I run into when working with Docker. This list will grow over time.

Run at your own risk. I am not responsible for copying & pasting without fully understanding what the implications are.

Show:

# Show running containers
docker ps

# Show all containers
docker ps -a

# Show all images
docker images

# Show running containers

docker ps

# Show all containers

docker ps -a

# Show all images

docker images

Stop:

# Stop a single container
docker stop <container id>

# Stop all running containers
docker stop $(docker ps -a -q)

# Stop a single container

docker stop <container id>

# Stop all running containers

docker stop $(docker ps -a -q)

Delete:

# Delete a single container
docker rm <container id>

# Delete all containers
docker rm $(docker ps -a -q)

# Delete a single image
docker rmi <image id>

# Delete all images
docker rmi $(docker images -q)

# Force delete a single image
docker rmi -f <image id>

# Force delete all images (if the above doesn't work)
docker rmi -f $(docker images -q)

# Delete a single container

docker rm <container id>

# Delete all containers

docker rm $(docker ps -a -q)

# Delete a single image

docker rmi <image id>

# Delete all images

docker rmi $(docker images -q)

# Force delete a single image

docker rmi -f <image id>

# Force delete all images (if the above doesn't work)

docker rmi -f $(docker images -q)

Build:

docker build -t Dockerfile .

1	docker build -t Dockerfile .

Publish:

docker docker push registry-host:5000/<your_name>/<your_repo>

1	docker docker push registry-host:5000/<your_name>/<your_repo>

Hosting a Meteor app on Ubuntu using Node, Mongo, and PM2

March 21, 2016December 30, 2016 Timothy Stewart1 Comment

Recently I had to start hosting a Meteor app on Ubuntu. The process is pretty straightforward however there are a few gotchas. This post is really just to help me remember in the future.

First, clone your repo on the target server or move the source files there before you compile/build the app. This is important if you are using a different OS than what your server is. I ran into issue when compiling it on OSX and moving it to Ubuntu.

After moving the files, install meteor.

curl https://install.meteor.com/ | sh

1	curl https://install.meteor.com/ \| sh

Then compile your app

meteor build .

1	meteor build .

It will create a archive for you.

Extract it to the directory you will host the app

tar -zxf myapp.tar.gz

1	tar -zxf myapp.tar.gz

cd into the server folder

cd /var/www/myapp/bundle/programs/server

1	cd /var/www/myapp/bundle/programs/server

install node modules

npm install

1	npm install

install pm2

npm install -g pm2

1	npm install -g pm2

cd back to the app bundle dir

cd /var/www/myapp/bundle

1	cd /var/www/myapp/bundle

create a process.json file

nano process.json

1	nano process.json

add your configuration

{
  "apps": [
    {
      "name": "myapp",
      "script": "./bundle/main.js",
      "log_date_format": "YYYY-MM-DD",
      "exec_mode": "fork_mode",
      "env": {
        "PORT": 3000,
        "MONGO_URL": "mongodb://127.0.0.1/myapp",
        "ROOT_URL": "https://myapp.example.com/",
        "BIND_IP": "127.0.0.1"
      }
    }
  ]
}

{

"apps": [

{

"name": "myapp",

"script": "./bundle/main.js",

"log_date_format": "YYYY-MM-DD",

"exec_mode": "fork_mode",

"env": {

"PORT": 3000,

"MONGO_URL": "mongodb://127.0.0.1/myapp",

"ROOT_URL": "https://myapp.example.com/",

"BIND_IP": "127.0.0.1"

}

]

}

create a shell script

nano run.sh

1	nano run.sh

add bash script

#!/bin/sh

# starts pm2 and watches the process

pm2 start process.json -i max --watch

#!/bin/sh

# starts pm2 and watches the process

pm2 start process.json -i max --watch

make it executable

chmod +x run.sh

1	chmod +x run.sh

run the bash script

./run.sh

./run.sh

run pm2 startup

pm2 startup

1	pm2 startup

this will output a command to run, run it

save current process

pm2 save

pm2 save

All set! Check the status of your app

pm2 list

pm2 list

You should see something similar to this

Also, here is a sample nginx site configuration using Let’s Encrypt SSL

server_tokens off; # for security-by-obscurity: stop displaying nginx version

        # this section is needed to proxy web-socket connections
        map $http_upgrade $connection_upgrade {
            default upgrade;
            ''      close;
        }

server {
        listen 443 ssl;
        root /var/www/myapp/bundle/;
        #index index.html index.htm;
        server_name myapp.example.com;
        ssl_certificate /etc/letsencrypt/live/myapp.example.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/myapp.example.com/privkey.pem;

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_prefer_server_ciphers on;
        ssl_dhparam /etc/ssl/certs/dhparam.pem;
        ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SH$
        ssl_session_timeout 1d;
        ssl_session_cache shared:SSL:50m;
        ssl_stapling on;
        ssl_stapling_verify on;

        add_header Strict-Transport-Security "max-age=31536000;";


   # Forward to meteor server                                                                                                       $
    location / {
         proxy_pass http://localhost:3000;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection "upgrade";
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
    location ~ /.well-known {
         allow all;
    }
}

server_tokens off; # for security-by-obscurity: stop displaying nginx version

# this section is needed to proxy web-socket connections

map $http_upgrade $connection_upgrade {

default upgrade;

'' close;

}

server {

listen 443 ssl;

root /var/www/myapp/bundle/;

#index index.html index.htm;

server_name myapp.example.com;

ssl_certificate /etc/letsencrypt/live/myapp.example.com/fullchain.pem;

ssl_certificate_key /etc/letsencrypt/live/myapp.example.com/privkey.pem;

ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

ssl_prefer_server_ciphers on;

ssl_dhparam /etc/ssl/certs/dhparam.pem;

ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SH$

ssl_session_timeout 1d;

ssl_session_cache shared:SSL:50m;

ssl_stapling on;

ssl_stapling_verify on;

add_header Strict-Transport-Security "max-age=31536000;";

# Forward to meteor server $

location / {

proxy_pass http://localhost:3000;

proxy_http_version 1.1;

proxy_set_header Upgrade $http_upgrade;

proxy_set_header Connection "upgrade";

proxy_set_header Host $host;

proxy_set_header X-Real-IP $remote_addr;

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

}

location ~ /.well-known {

allow all;

}

Connecting Physical to Virtual with my Raspberry Pi

February 6, 2016December 30, 2016 Timothy StewartNo Comments

Over the last few weeks I have tinkered with a Raspberry Pi 2 and I have to say it has been pretty fun. I built my Pi with a Zebra case, 32GB micro sd card, a few heat sinks, and a bread board kit so I can easy connect things to my GPIO. I also picked up a TP-LINK TL_WN725N USB NIC for WiFi. I chose this one specifically because it has drivers for both Linux and Windows.

I have gone back-and-forth on which operating system I am going to run on this little device. I have tested Raspbian and Windows 10 IoT core. I ended up settling on both. I have 2 microSD cards, one with Windows 10 IoT core, and one with Raspbian, RetroPie, and OSMC. I used BootBerry boot loader to install multiple version of Linux on the second microSD card.

So far I am sticking with Windows 10 IoT Core, a few reasons:

I am much more proficient at C# than I am python or any other compiled language
Windows 10 IoT can run python and even Nodejs if I choose
Using Visual Studio to deploy and debug directly to my Raspberry Pi is awesome – I am use to this workflow from developing Windows 8/10 and Windows Phone apps

This isn’t an exhaustive list nor is it meant to help anyone make any decisions on what to use, it is just my preference – for the moment at least. We’ll see how things go.

I am hoping to build an LED panel that I can push messages to over http. I have made progress over the last 2 weeks. You can check out some of my code here:

My GitHub Repos

Here are some videos of my progress

Turning on a light for the first time

Scrolling text on my small LED panel

Windows 10 Launches Tomorrow. Get It Free Today.

July 28, 2015July 28, 2015 Timothy StewartNo Comments

This my Tech PSA for everyone out there not following Windows 10 or tech news in general. Windows 10 launches tomorrow and if you are running Windows 7 or 8, you get it free. So how do you get it? Easy.

Look in the system tray for the Windows logo. For those less tech savvy, that’s the area in the lower right next to the clock.

Click on the Windows logo and follow the prompts to reserve your copy.

Windows 10 should start downloading in the background and as soon as it is released tomorrow you will be able to start the upgrade.

If you’re not sure if Windows 10 is right for you, you can check out all the new features here. My answer is: If you’re running Windows, yes, you want Windows 10.

Push Notifications using Windows Azure

April 9, 2015April 9, 2015 Timothy StewartNo Comments

I finally have push notifications working in Space Weather App from Windows Azure. Notifications for all 4 platforms work using one service bus. This simplifies my architecture and support since all of my infrastructure and services already live in Azure. No more costly 3rd party services.

Space Weather App and Ionic

March 24, 2015June 16, 2015 Timothy StewartNo Comments

We made it to the Ionic Framework showcase!

Space Weather App for Android, iOS, and Windows

March 16, 2015June 16, 2015 Timothy StewartNo Comments

Today I launched Space Weather App for Android, Apple iOS, and Windows. This means it will run on Android phones & tablets, iPhones, iPads, iPods, and Windows phones & tablets. You can check it out here http://www.spaceweatherapp.com/