Earlier in the week I wrote about the new Docker Swarm functionality, as i didnât have much time I was just using the Docker for Mac beta.
Launching a Swarm cluster
To test more of the new features we are going to need a few servers so rather than launching them locally I decided to write an Ansible playbook to launch x number of droplets in Digital Ocean . Once the droplets have launched the playbook goes on to perform the following tasks;
- Installs a few prerequisites like python 2.7, git and UFW
- Configures UFW, locking down the Docker services to just our Droplets
- Installs Docker 1.12rc2 experimental build from https://experimental.docker.com/
- Initializes the Swarm manager and then connects the worker nodes to the manager
The playbook is available on GitHub at https://github.com/russmckendrick/digitalocean-docker-swarm , the README has instructions on how to run the playbook so I wonât go into detail here, below is a what you should see when you run the playbook for the first time;
Once complete, you should have four droplets launched in Digital Ocean ;
Load Balancing
One of the features I wanted to try for myself was the Load Balancing. The documentation describes this as;
The swarm manager uses ingress load balancing to expose the services you want to make available externally to the swarm. The swarm manager can automatically assign the service a PublishedPort or you can configure a PublishedPort for the service in the 30000â32767 range.
 External components, such as cloud load balancers, can access the service on the PublishedPort of any node in the cluster whether or not the node is currently running the task for the service. All nodes in the swarm cluster route ingress connections to a running task instance.
Now you have your Docker Swarm cluster up and running we can test the Load Balancing to do this connect to the Manager, the IP is at the end of the playbook output or you can get it from your Digital Ocean control panel .
Once connected you can check everything is OK with your cluster by running;
Docker Load Balancing & Application Bundles 1/13
docker node ls
This will show all of the Droplets in the cluster and their current status. Now we have confirm our cluster is working as it should be we can launch some containers. In my previous post I created a service using my test container so I will do that again here.
Docker Load Balancing & Application Bundles 2/13
docker network create -d overlay clusternetwork
docker service create â name cluster -p:80:80/tcp â network clusternetwork russmckendrick/cluster
docker service ls
docker service tasks cluster
As you can see, I have a single container running on the docker-swarm-manager node. Lets try connecting to our container via the IP address of one of the worker nodes;
and there we have our container !!!
Last time we tried scaling, so lets try again now. As we have four droplets we can get into double digits;
Docker Load Balancing & Application Bundles 3/13
docker service scale cluster=15
docker service tasks cluster
Before looking at anything else lets remove the cluster service;
Docker Load Balancing & Application Bundles 4/13
docker service rm cluster
docker service ls
Docker Distributed Application Bundles (DAB)
While we have our Swarm cluster up and running, lets look at building a distributed application using a Docker Compose file. Docker Distributed Application Bundles are described as;
Distributed Application Bundles is an experimental open file format for bundling up all the artifacts required to ship and deploy multi-container apps: a DAB contains a description of all the services required to run the application and details images to use, ports to expose, and the networks used to link services.
The Docker Compose file we will be using follows;
Docker Load Balancing & Application Bundles 5/13
version: â2â
services:
wordpress:
container_name: my-wordpress-app
cover:
image: wordpress
ports:
â â80:80â
environment:
â âWORDPRESS_DB_HOST=mysql:3306â
â âWORDPRESS_DB_PASSWORD=passwordâ
mysql:
container_name: my-wordpress-database
cover:
image: mysql
expose:
â â3306â
environment:
â âMYSQL_ROOT_PASSWORD=passwordâ
As you can see the docker-compose.yml file runs a WordPress and MySQL container as well configures networking. On your local machine, check that you are running Docker Compose 1.8rc1, this is included in the latest Docker for Mac beta, by running;
Docker Load Balancing & Application Bundles 6/13
docker-compose â version
Now create a temporary folder and download the docker-compose.yml file;
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mkdir ~/Desktop/test
cd ~/Desktop/test
curl -O https://gist.githubusercontent.com/russmckendrick/c6320315431afd19a0ee10132e086673/raw/e3a8019a68c2122141cae14bcb84b4c20ef18fe6/docker-compose.yml
Now we have our Docker Compose file, download the images by running;
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docker-compose pull
and finally create the bundle by running;
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docker-compose bundle -o wordpress.dsb
a copy of the bundle created above looks like;
Docker Load Balancing & Application Bundles 10/13
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<template class="js-flash-template">
<div class="flash flash-full {{ className }}">
<div class="container-lg px-2" >
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<svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-x">
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<div>{{ message }}</div>
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Instantly share code, notes, and snippets.
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<a class="avatar mr-2 flex-shrink-0" data-hovercard-type="user" data-hovercard-url="/users/russmckendrick/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/russmckendrick"><img class=" avatar-user" src="https://avatars.githubusercontent.com/u/121128?s=64&v=4" width="32" height="32" alt="@russmckendrick" /></a>
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<span class="author"><a data-hovercard-type="user" data-hovercard-url="/users/russmckendrick/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/russmckendrick">russmckendrick</a></span><!--
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--><strong itemprop="name" class="css-truncate-target mr-1" style="max-width: 410px"><a href="/russmckendrick/c6320315431afd19a0ee10132e086673">docker-compose.yml</a></strong>
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Last active <time-ago datetime="2016-06-25T18:23:49Z" data-view-component="true" class="no-wrap">Jun 25, 2016</time-ago>
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<a class="btn btn-sm btn-with-count tooltipped tooltipped-n" aria-label="You must be signed in to fork a gist" rel="nofollow" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"gist fork button","repository_id":null,"auth_type":"LOG_IN","originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="47f7308ce3778bbe17cc378483e62271b71ed9273ef58c07bad2d94864c5c737" href="/login?return_to=https%3A%2F%2Fgist.github.com%2Frussmckendrick%2Fc6320315431afd19a0ee10132e086673%2F">
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<a class="btn btn-sm btn-block tooltipped tooltipped-n" aria-label="You must be signed in to star a gist" rel="nofollow" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"gist star button","repository_id":null,"auth_type":"LOG_IN","originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="a48c689d5c15facc9e8553b7a84477253aab1819668f80d6113ee9c4b336a5ca" href="/login?return_to=https%3A%2F%2Fgist.github.com%2Frussmckendrick%2Fc6320315431afd19a0ee10132e086673%2F">
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<nav class="UnderlineNav box-shadow-none px-3 px-lg-0 "
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<a class="js-selected-navigation-item selected UnderlineNav-item" data-pjax="true" data-hotkey="g c" aria-current="page" data-selected-links="gist_code /russmckendrick/c6320315431afd19a0ee10132e086673" href="/russmckendrick/c6320315431afd19a0ee10132e086673">
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class="select-menu-modal position-absolute"
data-menu-input="gist-share-url"
style="z-index: 99;" aria-label="Clone options">
<div class="select-menu-header">
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</div>
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<button name="button" type="button" class="select-menu-item width-full" aria-checked="true" role="menuitemradio" value="<script src="https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673.js"></script>" data-hydro-click="{"event_type":"clone_or_download.click","payload":{"feature_clicked":"EMBED","git_repository_type":"GIST","gist_id":37150325,"originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="de2bd46b2206f2e07835801870b9f8a7cc67bbfbdd41b867280d2355a3026c90">
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</button> <button name="button" type="button" class="select-menu-item width-full" aria-checked="false" role="menuitemradio" value="https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673" data-hydro-click="{"event_type":"clone_or_download.click","payload":{"feature_clicked":"SHARE","git_repository_type":"GIST","gist_id":37150325,"originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="bd14e934d5c3174f385bc964fffea25a960b7b414dcd1852a2208aeb134dbb7e">
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</svg>
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Copy sharable link for this gist.
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</button> <button name="button" type="button" class="select-menu-item width-full" aria-checked="false" role="menuitemradio" value="https://gist.github.com/c6320315431afd19a0ee10132e086673.git" data-hydro-click="{"event_type":"clone_or_download.click","payload":{"feature_clicked":"USE_HTTPS","git_repository_type":"GIST","gist_id":37150325,"originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="2da0aca5e2625fb2e2ed70023f612ae0404bb864e0544c50a9997f007aac75a5">
<svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-check select-menu-item-icon">
<path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path>
</svg>
<div class="select-menu-item-text">
<span class="select-menu-item-heading" data-menu-button-text>
Clone via
HTTPS
</span>
<span class="description">
Clone with Git or checkout with SVN using the repositoryâs web address.
</span>
</div>
</button> </div>
<div class="select-menu-list">
<a role="link" class="select-menu-item select-menu-action" href="https://docs.github.com/articles/which-remote-url-should-i-use" target="_blank">
<svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-question select-menu-item-icon">
<path fill-rule="evenodd" d="M8 1.5a6.5 6.5 0 100 13 6.5 6.5 0 000-13zM0 8a8 8 0 1116 0A8 8 0 010 8zm9 3a1 1 0 11-2 0 1 1 0 012 0zM6.92 6.085c.081-.16.19-.299.34-.398.145-.097.371-.187.74-.187.28 0 .553.087.738.225A.613.613 0 019 6.25c0 .177-.04.264-.077.318a.956.956 0 01-.277.245c-.076.051-.158.1-.258.161l-.007.004a7.728 7.728 0 00-.313.195 2.416 2.416 0 00-.692.661.75.75 0 001.248.832.956.956 0 01.276-.245 6.3 6.3 0 01.26-.16l.006-.004c.093-.057.204-.123.313-.195.222-.149.487-.355.692-.662.214-.32.329-.702.329-1.15 0-.76-.36-1.348-.863-1.725A2.76 2.76 0 008 4c-.631 0-1.155.16-1.572.438-.413.276-.68.638-.849.977a.75.75 0 101.342.67z"></path>
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id="gist-share-url"
type="text"
data-autoselect
class="form-control input-monospace input-sm"
value="<script src="https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673.js"></script>"
aria-label="Clone this repository at <script src="https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673.js"></script>"
readonly>
<div class="input-group-button">
<clipboard-copy for="gist-share-url" aria-label="Copy to clipboard" class="btn btn-sm zeroclipboard-button" data-hydro-click="{"event_type":"clone_or_download.click","payload":{"feature_clicked":"COPY_URL","git_repository_type":"GIST","gist_id":37150325,"originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="0e5cd1a7f085965a5972efd55528d4687ad50bb3f643cbbcb2c946f6128acc54"><svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-clippy">
<path fill-rule="evenodd" d="M5.75 1a.75.75 0 00-.75.75v3c0 .414.336.75.75.75h4.5a.75.75 0 00.75-.75v-3a.75.75 0 00-.75-.75h-4.5zm.75 3V2.5h3V4h-3zm-2.874-.467a.75.75 0 00-.752-1.298A1.75 1.75 0 002 3.75v9.5c0 .966.784 1.75 1.75 1.75h8.5A1.75 1.75 0 0014 13.25v-9.5a1.75 1.75 0 00-.874-1.515.75.75 0 10-.752 1.298.25.25 0 01.126.217v9.5a.25.25 0 01-.25.25h-8.5a.25.25 0 01-.25-.25v-9.5a.25.25 0 01.126-.217z"></path>
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<a class="btn btn-sm tooltipped tooltipped-s tooltipped-multiline js-remove-unless-platform" data-platforms="windows,mac" aria-label="Save russmckendrick/c6320315431afd19a0ee10132e086673 to your computer and use it in GitHub Desktop." data-hydro-click="{"event_type":"clone_or_download.click","payload":{"feature_clicked":"OPEN_IN_DESKTOP","git_repository_type":"GIST","gist_id":37150325,"originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="3ca6036019eae2e610d20d12398b41ea421bb99e1f862975742519f7f71aad4d" href="https://desktop.github.com"><svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-desktop-download">
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</svg></a>
</div>
<div class="ml-2">
<a class="btn btn-sm" rel="nofollow" data-hydro-click="{"event_type":"clone_or_download.click","payload":{"feature_clicked":"DOWNLOAD_ZIP","git_repository_type":"GIST","gist_id":37150325,"originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="c694827d7b7759dec7d874afb70c0a263c83b6cce239248e4ec3cb7c50bd3870" data-ga-click="Gist, download zip, location:gist overview" href="/russmckendrick/c6320315431afd19a0ee10132e086673/archive/e3a8019a68c2122141cae14bcb84b4c20ef18fe6.zip">Download ZIP</a>
</div>
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<td id="file-docker-compose-yml-L2" class="blob-num js-line-number" data-line-number="2"></td>
<td id="file-docker-compose-yml-LC2" class="blob-code blob-code-inner js-file-line"><span class="pl-ent">services</span>:</td>
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<td id="file-docker-compose-yml-L3" class="blob-num js-line-number" data-line-number="3"></td>
<td id="file-docker-compose-yml-LC3" class="blob-code blob-code-inner js-file-line"> <span class="pl-ent">wordpress</span>:</td>
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<td id="file-docker-compose-yml-L4" class="blob-num js-line-number" data-line-number="4"></td>
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<td id="file-docker-compose-yml-LC5" class="blob-code blob-code-inner js-file-line"> <span class="pl-ent">image</span>: <span class="pl-s">wordpress</span></td>
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<td id="file-docker-compose-yml-L10" class="blob-num js-line-number" data-line-number="10"></td>
<td id="file-docker-compose-yml-LC10" class="blob-code blob-code-inner js-file-line"> - <span class="pl-s"><span class="pl-pds">"</span>WORDPRESS_DB_PASSWORD=password<span class="pl-pds">"</span></span></td>
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<td id="file-docker-compose-yml-LC11" class="blob-code blob-code-inner js-file-line"> <span class="pl-ent">mysql</span>:</td>
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<td id="file-docker-compose-yml-LC16" class="blob-code blob-code-inner js-file-line"> <span class="pl-ent">environment</span>:</td>
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<td id="file-docker-compose-yml-LC17" class="blob-code blob-code-inner js-file-line"> - <span class="pl-s"><span class="pl-pds">"</span>MYSQL_ROOT_PASSWORD=password<span class="pl-pds">"</span></span></td>
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<path fill-rule="evenodd" d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0016 8c0-4.42-3.58-8-8-8z"></path>
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</a>
<ul class="list-style-none d-flex flex-wrap col-12 col-lg-5 flex-justify-center flex-lg-justify-between mb-2 mb-lg-0">
<li class="mr-3 mr-lg-0"><a href="https://support.github.com" data-hydro-click="{"event_type":"analytics.event","payload":{"category":"Footer","action":"go to contact","label":"text:contact","originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="cf8d46ecc5cf70ed5b79d5d5b5914fdff62a8afa07d943e50e0971fa771d1fe8">Contact GitHub</a></li>
<li class="mr-3 mr-lg-0"><a href="https://github.com/pricing" data-hydro-click="{"event_type":"analytics.event","payload":{"category":"Footer","action":"go to Pricing","label":"text:Pricing","originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="d9efe25b8091274cc444c68f4955225f12513096e0c24ab6c9ef3f8a2075234c">Pricing</a></li>
<li class="mr-3 mr-lg-0"><a href="https://docs.github.com" data-hydro-click="{"event_type":"analytics.event","payload":{"category":"Footer","action":"go to api","label":"text:api","originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="755b1a0d47a31741b69a9f8ae5b965a035c4b05bf21b602e53c063bce4699571">API</a></li>
<li class="mr-3 mr-lg-0"><a href="https://services.github.com" data-hydro-click="{"event_type":"analytics.event","payload":{"category":"Footer","action":"go to training","label":"text:training","originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="8ea7f042df28d99ce6d6f1b228446724e46ced53ba1ac75af85fe91be2c64eef">Training</a></li>
<li class="mr-3 mr-lg-0"><a href="https://github.blog" data-hydro-click="{"event_type":"analytics.event","payload":{"category":"Footer","action":"go to blog","label":"text:blog","originating_url":"https://gist.github.com/russmckendrick/c6320315431afd19a0ee10132e086673","user_id":null}}" data-hydro-click-hmac="d688e0cb0a073d5c23752216466039ea1dafd4ae632ca26cf524c0d1299970cb">Blog</a></li>
<li><a data-ga-click="Footer, go to about, text:about" href="https://github.com/about">About</a></li>
</ul>
</div>
<div class="d-flex flex-justify-center pb-6">
<span class="f6 color-text-tertiary"></span>
</div>
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<div id="ajax-error-message" class="ajax-error-message flash flash-error" hidden>
<svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-alert">
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<svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-x">
<path fill-rule="evenodd" d="M3.72 3.72a.75.75 0 011.06 0L8 6.94l3.22-3.22a.75.75 0 111.06 1.06L9.06 8l3.22 3.22a.75.75 0 11-1.06 1.06L8 9.06l-3.22 3.22a.75.75 0 01-1.06-1.06L6.94 8 3.72 4.78a.75.75 0 010-1.06z"></path>
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You canât perform that action at this time.
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<svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-alert">
<path fill-rule="evenodd" d="M8.22 1.754a.25.25 0 00-.44 0L1.698 13.132a.25.25 0 00.22.368h12.164a.25.25 0 00.22-.368L8.22 1.754zm-1.763-.707c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0114.082 15H1.918a1.75 1.75 0 01-1.543-2.575L6.457 1.047zM9 11a1 1 0 11-2 0 1 1 0 012 0zm-.25-5.25a.75.75 0 00-1.5 0v2.5a.75.75 0 001.5 0v-2.5z"></path>
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<template id="site-details-dialog">
<details class="details-reset details-overlay details-overlay-dark lh-default color-text-primary hx_rsm" open>
<summary role="button" aria-label="Close dialog"></summary>
<details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal">
<button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog>
<svg aria-hidden="true" viewBox="0 0 16 16" version="1.1" data-view-component="true" height="16" width="16" class="octicon octicon-x">
<path fill-rule="evenodd" d="M3.72 3.72a.75.75 0 011.06 0L8 6.94l3.22-3.22a.75.75 0 111.06 1.06L9.06 8l3.22 3.22a.75.75 0 11-1.06 1.06L8 9.06l-3.22 3.22a.75.75 0 01-1.06-1.06L6.94 8 3.72 4.78a.75.75 0 010-1.06z"></path>
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<div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;">
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<template id="snippet-clipboard-copy-button">
<div class="zeroclipboard-container position-absolute right-0 top-0">
<clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0 tooltipped-no-delay" data-copy-feedback="Copied!" data-tooltip-direction="w">
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</template>
</body>
</html>
Back on our Swarm manager, we can download the distributed app by running;
Docker Load Balancing & Application Bundles 11/13
curl -O https://gist.githubusercontent.com/russmckendrick/c6320315431afd19a0ee10132e086673/raw/e3a8019a68c2122141cae14bcb84b4c20ef18fe6/wordpress.dsb
docker deploy wordpress
Now the application has been deployed you can check its status by running;
Docker Load Balancing & Application Bundles 12/13
docker stack tasks wordpress
Finally, we need to know which port our WordPress container has been published on so that we can access it in our browser. To get this information run the following command;
Docker Load Balancing & Application Bundles 13/13
docker service inspect wordpress_wordpress
and make a note of the PublishedPort in the Endpoint section.
Going to any of your hosts on port 30001 should present you with a WordPress installation screen.
Itâs worth noting that this feature is not yet complete and it seems to be quite limiting, for example there doesnât appear to be a way to mount volumes or define which port is exposed.
Tearing down the cluster
As none of us want servers hanging around, not being used but costing us money there is a playbook which terminates the Drops we originally launched, to run it follow the instructions in the README .
