Download Docker in Action by Jeff Nickoloff PDF

April 4, 2017 | Programming | By admin | 0 Comments

By Jeff Nickoloff

Docker in motion teaches readers how one can create, installation, and deal with purposes hosted in Docker bins. After beginning with a transparent clarification of the Docker version, you are going to how to package deal purposes in boxes, together with recommendations for trying out and allotting functions. additionally, you will the right way to run courses securely and the way to control shared assets. utilizing conscientiously designed examples, the e-book teaches you the way to orchestrate bins and purposes from set up to elimination. alongside the way in which, you'll realize options for utilizing Docker on structures starting from dev-and-test machines to full-scale cloud deployments.

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The WordPress containers can be destroyed, restarted, and upgraded without any worry about loss of data. 4 shows this architecture. The client should be pleased with what is being delivered. But one thing might be bothering you. In earlier testing you found that the monitoring agent correctly notified the mailer when the site was unavailable, but restarting the site and agent required manual work. It would be better if the system tried to automatically recover when a failure was detected. Docker provides restart policies to help deal with that, but you might want something more robust.

If you build systems or software that know too much about their environment— like addresses or fixed locations of dependency services—it’s difficult to change that environment or reuse the software. You need to deliver a system that minimizes environment dependence before the contract is complete. 5 Building environment-agnostic systems Much of the work associated with installing software or maintaining a fleet of computers lies in dealing with specializations of the computing environment. These specializations come as global-scoped dependencies (like known host file system locations), hard-coded deployment architectures (environment checks in code or configuration), or data locality (data stored on a particular computer outside the deployment architecture).

When you’re working with the docker tool directly, you can always use docker ps to look up the human-friendly names. Container identification can be tricky, but you can manage the issue by using the ID and name-generation features of Docker. 2 Container state and dependencies With this new knowledge, the new system might looks something like this: MAILER_CID=$(docker run -d dockerinaction/ch2_mailer) WEB_CID=$(docker create nginx) Make sure mailer from first example is running AGENT_CID=$(docker create --link $WEB_CID:insideweb \ --link $MAILER_CID:insidemailer \ dockerinaction/ch2_agent) This snippet could be used to seed a new script that launches a new NGINX and agent instance for each of your client’s customers.

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