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These benefits already sound like a good reason to run your web app or Bitcoin Node within a Docker container, but management of your docker containers still requires logging into a server somewhere and running a list of commands. Let alone scaling up nodes for a highly available application during periods of peak load.
This is where Rancher comes in to make things a breeze. Rancher makes it easy to create Docker hosts on cloud providers, or on your own servers. It comes bundled with Rancher UI, which allows you to launch compute nodes directly from a web interface, making it easy to create and manage multi-node deployments from a single interface.
I had already been looking into creating Dockerised Bitcoin Nodes and with all the UASF hoo-ha going in the Bitcoin world at the moment, I thought it would be a good example to orchestrate deployment of Bitcoin full nodes via Rancher so you can scale up your Node count and show support for BIP or not.
There is no need to reinvent the wheel, where it makes sense, but there are some important changes I have made to apply specifically to the deployment of Bitcoin Nodes and automating block storage provisioning to store the blockchain as of this writing GB. In order to use Rancher to manage Docker hosts and containers, we need to get Rancher running.
First, log into your DigitalOcean account and choose Create Droplet. Then, under the Choose an Image section, select the One-click Apps tag. Select the Docker Then select User Data in the Select additional options section, and enter the script below in the text box that appears.
Then wait while your new server is created. Once the server starts, Docker will download a Rancher image and start the Rancher server, which make take a few more minutes. Once you verify that Rancher is running, you can log out of the machine. Once your server is up, browse to http: Github will be selected as the default authentication method, so follow the instructions on the page to register a new application with GitHub.
Then, under Test and enable authentication , click Authenticate with GitHub , and click Authorize application in the window that pops up. The page will reload and the instructions on setting up OAuth will be replaced by the Configure Authorization section. Add any additional users and organizations that should be given access to Rancher.
If you make any changes, click the Save button. An environment in Rancher lets us group our hosts into logical sets. Click the Default link at the top of the screen to reveal the Environments menu, then click Manage Environments. Click the Add Environment button that appears on the page. Fill in Bitcoin Mainnet as the name for your project. Leave all of the other settings at their defaults and click Create. Then use the project selection menu again to select your new environment.
This is where things get a bit trickier. As previously mentioned the Bitcoin blockchain is currently a whopping GB and we need to store that somewhere. Still arguably expensive to run a single Bitcoin Node, but maybe you got rich of the first Bitcoin boom and now money is no object! So before we go ahead and start launching our hosts, we want to automate the provisioning of this block storage for each host.
By default Rancher will configure each new host using an install script found in this GitHub repository. Create a new shell script called do-provision-volume. Then tie it all together with an install. Make sure to update the second curl URL with the hosted location of your do-provision-volume. You can find examples of these scripts over on my install-docker Github repository. If this is a concern you can manually run these scripts after Step 5, but before Step 6.
Once you have secured your Rancher deployment and added a project, select Hosts from the Infrastructure menu and then click the Add Host button. On the Add Host screen, you will see several providers: The Custom option lists the steps to manually launch a Rancher compute node on a server with Docker pre-installed. The others are used to launch compute nodes on the respective cloud systems. Rancher will use Docker Machine to create the specified Droplet and run our install script to provision the block storage and Docker on it.
Rancher will also run rancher-agent on the newly created Droplet, which will in turn register with the Rancher server.
You will also get some basic information about the host such as its IP address, processor clock-speed, memory, and storage. You can repeat this step as many times as you need to launch more compute nodes into your deployment. Once your compute nodes are provisioned, click on the name of one of your hosts to pull up the Monitoring screen, where you can see the CPU utilization and memory consumption of that compute node.
The last check you can do is enter your host IP and port into the Check Node tool over at Bitnodes. To add more Bitcoin Nodes to the network, just repeat steps 3 to 6 above. You can shut down any additional nodes by visiting the Hosts page, locating your host, and clicking the Deactivate icon the box with two vertical lines, as shown in the following figure:. You can then subsequently click either Activate or Delete from the menu to the right of the Deactivate button.
Next, select a 1GB Droplet and choose a datacenter region for your Droplet. This will erase all data on the volume. Only run this command on a volume with no existing data sudo mkfs.