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There is still a full operating system installed on each VM. The hypervisor can optimize the way the physical resources are used, but ultimately you will have a full operating system running for each VM, with all the overheads that entails. When using containers, there is a single operating system installed on the physical hardware, which each container makes use of. In the case of linux containers, you are separating processes, but each container is using the same OS.

In the case of Docker on Linux, each container shares the same kernel, but contains the libraries and binaries necessary to make the container look like the Linux distribution of your choice, as well as all the libraries and binaries necessary to run the application inside the container. There is of course nothing to stop you running containers inside a virtual machine. The VMware implementation of containers does exactly that.

Each container runs inside a very small footprint VM, which gives the complete isolation of a VM, but the lightweight feel of Docker.


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For your own data center you may end up with a hybrid model that mixes virtualization and containerization. After viewing this it's very easy to think of Docker as lightweight virtualization, which is exactly what I did before I started to use it, but this is a mistake.

Docker is focused on application delivery, with each container fulfilling a specific role. This is unlike virtualization, where you move your monolithic application from physical to a VM and continue to work in the same way. There are lots of comparison lists you can Google that show differing degrees of bias.

I'll just list a few points that stand out to me. You should probably start by reading this. A Dockerfile is a series of commands or operations that define how to build an image. The image is built up of read-only layers, with each instruction in the Dockerfile resulting in a new read-only layer, based on the previous layer. The resulting image is also read-only. We can see the current tagged images using the docker images command, and the layers that make up the image using the docker history command. A container is a running instance of an image, but the container also has its own read-write layer, so it can make changes to the files presented from the base image.

database administrator (DBA)

The file system changes made by the container are handled using copy-on-write, so only those files that are changed from the base image are stored. This means multiple containers can share the same base image, without having to duplicate the entire storage associated with that image. It also means new images can be based on existing common layers. This can result in substantial space savings when you have many similar containers running. The use of layers, images and copy-on-write means there is a strong emphasis on building generic images that can be reused.

To achieve this you will often see Dockerfiles that build a generic image, and perform all container-specific configuration the first time the container is run, using environment variables and mounted volumes to influence the container-specific configuration. When you start defining your own builds, it's worth keeping this separation in mind, or you will end up with many similar images, which will waste a lot of space.

As DBAs we are used to having quite a lot of software installed on our operating systems.

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A typical Linux database VM might include a window manager, like GNOME, an assortment of development tools and editors, as well as a number of operating system performance and diagnostic packages. With all the required dependencies, this can make the operating system quite large. When building Docker images, there is a strong emphasis on keeping the images as small as possible.

How to install oracle 12c on Linux

Typically images are based on a cut down version of the OS. In my case I typically use "oraclelinuxslim", which doesn't come with basic commands like unzip , tar and gzip. It's tempting to install "all the usual stuff" using Yum, but you should try to keep things as light as possible. Your aim should be to install the minimum amount of software to get the application running and no more. This can be quite challenging at first. I've heard it said a few times, if you have to connect to your container, you've failed.

You will obviously be exposing ports to the outside world so people can connect to the application server or database running inside the container. DBAs will be asked how the database can contribute to the overall business goals of the company and what solutions there are to help meet those goals.

DBAs Guide to Databases Under Linux - 1st Edition

They will need to help application developers create database calls that not only make sense now but will work at scale. With new technology options such as cloud deployment and containerization, they will need to monitor and constantly reevaluate how applications are working with the database and how to improve performance or incorporate new features or demands from customers without affecting performance.

Finally, as more and more companies use different databases for different applications and scenarios, DBAs will need to continually keep up-to-date on new database trends and technologies in order to remain an expert source of database knowledge. Over the years at Percona, we have seen this shift as well. The types of issues we face daily have evolved along with the database environment and the role of the DBA.

Introduction to Oracle Database 11g

More stable databases, coupled with advances in either homegrown automation or cloud-based infrastructure, reduce the likelihood of general crashing bugs due to the core database software. Often, today's causes of outages and issues are design decisions, bad code, or odd "edge cases" that weren't considered in the initial planning. All of this means that the role of the DBA is moving away from simply "keeping it up and running" to a much more strategic position: The DBA is one of the experts that helps enterprises reach their strategic business goals.

Today's database administrators are more than the people who keep the lights on—now they are expected to play a strategic role in achieving the business' goals. Image credits :.


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Get the highlights in your inbox every week. New revenue models, new application issues As doing business on the internet became not only more common, but necessary to remain competitive, enterprises needed to find new deployment models that could keep up with shifting technologies and architectures.

Enterprise database needs are evolving When deploying services, applications, or websites, you always need to plan for scale. What do DBAs need to know? Topics Sysadmin.

About the author. More about me. Learn how you can contribute. Recommended reading Build web apps to automate sysadmin tasks. A guide to human communication for sysadmins. Linux permissions What does it mean to be a sysadmin hero?


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This is definitely not needed for OL7, but worth considering if the installer gives prerequisite failures for these settings. If you have the Linux firewall enabled, you will need to disable or configure it, as shown here or here. To disable it, do the following. Putting mount points directly under root is typically a bad idea. Unless you are working from the console, or using SSH tunnelling, login as root and issue the following command. Create an environment file called "setEnv. If you are not creating the file with the cat command, you will need to remove the escape characters.

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Make sure the ownership and permissions are correct.