For providing the ability to use lightweight software containers, Docker relies on such resource isolation features of the Linux kernel as
Since Docker is based on the kernel’s functionality and uses resource isolation, as well as
- isolated resources,
- restricted services,
- provisioned processes with a private view of the operating system, own process ID space, file system structure, network interfaces, etc.
Despite all Docker containers share the same kernel, each one can be limited to a defined amount of memory, CPU, and I/O.
If you are looking for a tool designed for the creation and management of highly distributed systems, Docker is a perfect solution, since it allowing multiple apps, tasks, and processes to run autonomously across multiple virtual machines or on a single device.
Moreover, Docker allows PaaS-style deployment and scaling for MongoDB, Apache Cassandra, Riak, and other similar systems. It also simplifies the management of workload queues and other distributed systems.
It is also necessary to mention that Docker supports integration with various infrastructure tools, such as Amazon Web Services, CFEngine, Google Cloud Platform, IBM Bluemix, Jenkins, Microsoft Azure,OpenSVC, Puppet, Vagrant, etc. But why is Docker so popular? Below, you can see some core reasons of its success.
- Efficiency. With Docker, you you can significantly multiply the number of server app instances compared to Xen or KVM VMs.
- Simplicity. Docker containers are easier and safer to deploy and use than other solutions.
- Portability. You can easily move software containers from one computing environment to another.
- Standardization. With Docker, the container ecosystem has got much-needed standardization.
- Environmental agnosticism. You can run Docker software containers virtually anywhere.
- Docker clouds. Docker containers are easy to deploy in a cloud.
Moreover, Docker makes it possible to:
- set up a local development environment which behaves like live server;
- run multiple development environments with unique software and configurations from the same host;
- test projects on various servers;
- allow anyone to participate in the same project without any limits related to a local host environment.
Now, when you know about Docker’s benefits, I can compare it with other competitors.
Table of contents
Docker vs Rocket
Despite CoreOS is one of Docker’s supporters, it released its own open source project called Rocket. While Docker is too complex and focused on the needs of the parent company, Rocket was developed with the original portability mission in mind. Thus, they offer different features, but provide similar opportunities typical for container software. I recommend you to check the following podcast to understand the difference between Docker and Rocket. Besides, you can examine these article:
Docker vs Vagrant
Being a supercharged Linux chroot, Docker provides you with the ability to snapshot the OS and apps you want into a common image for further deployment on Docker hosts in a form of software containers. Thereby, a machine you’re deploying to must also have preinstalled Docker.
On the other hand, Vagrant relies on VM’s, but remains significantly lighter than a complete VM. The tool provides a reproducible way for generating fully virtualized machines with the aid of VirtualBox, VMWare technology, or AWS.
Check the following video for further explanations. You can also read more about both solutions in this article:
Docker vs Chef
Both Docker vs Chef simplify development in a multi-server environment, but the approaches they incorporate are very different indeed. While Docker isolates the OS from the kernel and generates a ‘level-zero’ package, Chef relies on a master-agent setup with a central master server coordinating and sending out instructions to agents from other client nodes. Sound quite complicated, isn’t it? Well, this
Docker vs LXC
Due to the lack of support for things like cron, ssh, logging, and daemons in Docker containers, you have to manage everything via Docker or other container management software. As for LXC, it sidesteps this limitation with a normal OS environment. Thus, the tool is immediately compatible with all apps and management and orchestration layers. You can discover more information by following this link:
Docker hosting solutions
Below, you will find a list of Docker cloud servers and other hosting solutions optimized for Docker.
In its turn
Now you are familiar with the nature Docker, know its benefits over competitors, and understand what hosting solutions are optimized for the work with Docker containers. If you have any questions related to the usage of the platform, pay attention to the official Docker ‘how to’: