■ IntroduCtIon
xviii
Chapter 3 discusses the managed service Docker for AWS, which provisions a Docker Swarm by
supplying the Swarm parameters, including the number of managers and workers and the type of EC2
instances to use. AWS uses an AWS CloudFormation to create the resources for a Swarm. Docker for AWS
makes it feasible to create a Swarm across multiple AWS zones.
Chapter 4 is about Docker services. Two types of services are defined—replicated and global. Chapter 4
discusses creating a service (replicated and global), scaling a replicated service, listing service tasks, and
updating a service.
Chapter 5 discusses scaling replicated services in more detail, including scaling multiple services
simultaneously. Global services are not scalable.
In Chapter 6, two types of mounts are defined: a bind mount and volume mount. This chapter discusses
creating and using each type of mount.
Chapter 7 is about configuring and using resources in a Swarm. Two types of resources are supported
for configuration: memory and CPU. Two types of resource configurations are defined: reserves and limits.
It discusses creating a service with and without resources specification.
Chapter 8 discusses scheduling service tasks with the default and custom scheduling. Scheduling
constraints are also discussed.
Chapter 9 discusses rolling updates, including setting a rolling update policy. Different types of rolling
updates are provisioned, including updating to a different Docker image tag, adding/removing environment
variables, updating resource limits/reserves, and updating to a different Docker image.
Chapter 10 is about networking in Swarm mode, including the built-in overlay networking called ingress
and support for creating a custom overlay network.
Chapter 11 is about logging and monitoring in a Swarm, which does not provide a built-in support for
logging and monitoring. Logging and monitoring is provided in a Swarm with a Sematext Docker agent,
which sends metrics to a SPM dashboard and logs to a Logsene user interface and Kibana.
Chapter 12 discusses load balancing across service tasks with ingress load balancing. An external AWS
elastic load balancer may also be added for distributing client requests across the EC2 instances on which a
Swarm is based.
Chapter 13 discusses developing a highly available website that uses an Amazon Route 53 to create a
hosted zone with resource record sets configured in a Primary/Secondary failover mode.
Chapter 14 discusses another managed service, Docker Cloud, which may be used to provision a
Docker Swarm or connect to an existing Swarm.
Chapter 15 discusses Docker service stacks. A stack is a collection of services that have dependencies
among them and are defined in a single configuration file for deployment.
Who this Book Is For
The primary audience of this book includes Docker admins, Docker application developers, and Container
as a Service (CaaS) admins and developers. Some knowledge of Linux and introductory knowledge of
Docker—such as using a Docker image to run a Docker container, connecting to a container using a bash
shell, and stopping and removing a Docker container—is required.
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