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20150330-2 选题
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2 Ways to Create Your Own Docker Base Image
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================================================================================
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Greetings to everyone, today we'll learn about docker base Images and how we can build our own. [Docker][1] is an Open Source project that provides an open platform to pack, ship and run any application as a lightweight container. It has no boundaries of Language support, Frameworks or packaging system and can be run anywhere, anytime from a small home computers to high-end servers. It makes them great building blocks for deploying and scaling web apps, databases, and back-end services without depending on a particular stack or provider.
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Docker Images is a read-only layer which never changes. It Docker uses a **Union File System** to add a read-write file system over the read-only file system. But all the changes go to the top-most writeable layer, and underneath, the original file in the read-only image is unchanged. Since images don't change, images do not have state. Base Images are those images that has no parent. The major benefits of it is that it allows us to have a separate linux OS running.
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Here are the ways on how we can create a custom base image.
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### 1. Creating Docker Base Image using Tar ###
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We can create our own base image using tar, we'll want to start building it with a working Linux Distribution we'll want to package as base image. This process may differ and depends on what distribution we are trying to build. In Debian distribution of Linux, debootstrap is preinstalled. We'll need to install debootstrap before starting the below process. Debootstrap is used to fetch the required packages to build the base system. Here, we'll create image based on Ubuntu 14.04 "Trusty". To do so, we'll need to run the following command in a terminal or shell.
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$ sudo debootstrap trusty trusty > /dev/null
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$ sudo tar -C trusty -c . | sudo docker import - trusty
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Here, the above command creates a tar file of the current directory and outputs it to STDOUT, where "docker import - trusty" takes it from STDIN and creates a base image called trusty from it. Then, we'll run a test command inside that image as follows.
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$ docker run trusty cat /etc/lsb-release
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Here are some example scripts that will allow us to build quick base images in [Docker GitHub Repo][2] .
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### 2. Creating Base Image using Scratch ###
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In the Docker registry, there is a special repository known as Scratch, which was created using an empty tar file:
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$ tar cv --files-from /dev/null | docker import - scratch
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We can use that image to base our new minimal containers FROM:
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FROM scratch
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ADD script.sh /usr/local/bin/run.sh
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CMD ["/usr/local/bin/run.sh"]
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The above Dockerfile is from an extremely minimal image. Here, first it starts with a totally blank filesystem, then it copies script.sh that is created to /usr/local/bin/run.sh and then run the script /usr/local/bin/run.sh .
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### Conclusion ###
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Here, in this tutorial, we learned how we can build a custom Docker Base Image out of the box. Building a docker base image is an easy task because there are sets of packages and scripts already available for. Building a docker base image is a lot useful if we want to install what we want in it. So, if you have any questions, suggestions, feedback please write them in the comment box below. Thank you ! Enjoy :-)
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--------------------------------------------------------------------------------
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via: http://linoxide.com/linux-how-to/2-ways-create-docker-base-image/
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作者：[Arun Pyasi][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/arunp/
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[1]:https://www.docker.com/
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[2]:https://github.com/docker/docker/blob/master/contrib/mkimage-busybox.sh
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How to Serve Git Repositories Using Gitblit Tool in Linux
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================================================================================
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Hi friends, today we'll be learning how to install Gitblit in your Linux Server or PC. So, lets check out what is a Git, its features and steps to install Gitblit. [Git is a distributed revision control system][1] with an emphasis on speed, data integrity, and support for distributed, non-linear workflows. It was initially designed and developed by Linus Torvalds for Linux kernel under the terms of the GNU General Public License version 2 development in 2005, and has since become the most widely adopted version control system for software development.
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[Gitblit is a free and open source][2] built on a pure Java stack designed to handle everything from small to very large projects with speed and efficiency for serving Git repositories. It is easy to learn and has a tiny footprint with lightning fast performance. It outclasses SCM tools like Subversion, CVS, Perforce, and ClearCase with features like cheap local branching, convenient staging areas, and multiple workflows.
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#### Features of Gitblit ####
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- It can be used as a dumb repository viewer with no administrative controls or user accounts.
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- It can be used as a complete Git stack for cloning, pushing, and repository access control.
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- It can be used without any other Git tooling (including actual Git) or it can cooperate with your established tools.
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### 1. Creating Gitblit install directory ###
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First of all we'll gonna to create a directory in our server in which we'll be installing our latest gitblit in.
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$ sudo mkdir -p /opt/gitblit
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$ cd /opt/gitblit
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### 2. Downloading and Extracting ###
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Now, we will want to download the latest gitblit from the official site. Here, the current version of gitblit we are gonna install is 1.6.2 . So, please change it as the version you are gonna install in your system.
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$ sudo wget http://dl.bintray.com/gitblit/releases/gitblit-1.6.2.tar.gz
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Now, we'll be extracting our downloaded tarball package to our current folder ie /opt/gitblit/
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$ sudo tar -zxvf gitblit-1.6.2.tar.gz
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### 3. Configuring and Running ###
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Now, we'll configure our Gitblit configuration. If you want to customize the behavior of Gitblit server, you can do it by modifying `gitblit/data/gitblit.properties` . Now, after you are done configuring the configuration. We finally wanna run our gitblit. We have two options on running gitblit, first is that we run it manually by the command below:
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$ sudo java -jar gitblit.jar --baseFolder data
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And next is to add and use gitblit as service. Here are the steps that we'll need to follow to use gitblit as service in linux.
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So, As I am running Ubuntu, the command below will be sudo cp service-ubuntu.sh /etc/init.d/gitblit so please change the file name service-ubuntu.sh to the distribution you are currently running.
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$ sudo ./install-service-ubuntu.sh
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$ sudo service gitblit start
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Open your browser to http://localhost:8080 or https://localhost:8443 or replace "localhost" with the ip-address of the machine depending on your system configuration. Enter the default administrator credentials: admin / admin and click the Login button.
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Now, we'll wanna add a new user. First you'll need to login to the admin with default administrator credentials: username = **admin** and password = **admin** .
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Then, Goto user icon > users > (+) new user. And create a new user like as shown in the figure below.
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Now, we'll create a new repo out of the box. Go to repositories > (+) new repository . Then, add new repository as shown below.
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#### Create a new repository on the command-line ####
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touch README.md
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git init
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git add README.md
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git commit -m "first commit"
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git remote add origin ssh://arunlinoxide@localhost:29418/linoxide.com.git
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git push -u origin master
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Please replace the username arunlinoxide with the user you add.
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#### Push an existing repository from the command-line ####
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git remote add origin ssh://arunlinoxide@localhost:29418/linoxide.com.git
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git push -u origin master
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**Note**: It is highly recommended to everyone to change the password of username "admin" as it comes by default.
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### Conclusion ###
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Hurray, we finally installed our latest Gitblit in our Linux Computer. We can now enjoy such a beautiful version controlling system for our projects whether its small or large, no matter. With Gitblit, version controlling has been too easy. It is easy to learn and has a tiny footprint with lightning fast performance. So, if you have any questions, suggestions, feedback please write them in the comment box below.
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--------------------------------------------------------------------------------
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via: http://linoxide.com/linux-how-to/serve-git-repositories-gitblit/
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作者：[Arun Pyasi][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/arunp/
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[1]:http://git-scm.com/
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[2]:http://gitblit.com/
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Linux FAQs with Answers--How to upgrade Docker on Ubuntu
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================================================================================
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> **Question**: I installed Docker on Ubuntu using its standard repositories. However, the default Docker installation does not meet the version requirement for my another application that relies on Docker. How can I upgrade Docker to the latest version on Ubuntu?
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Since Docker was first released in 2013, it has been fast evolving into a full-blown open platform for distributed applications. To meet the industry's expection, Docker is being aggressively developed and constantly upgraded with new features. Chances are that the stock Docker that comes with your Ubuntu distribution is quickly outdated. For example, Ubuntu 14.10 Utopic comes with Docker version 1.2.0, while the latest Docker version is 1.5.0.
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For those of you who want to stay up-to-date with Docker's latest developments, Canonical maintains a separate PPA for Docker. Using this PPA repository, you can easily upgrade Docker to the latest version on Ubuntu.
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Here is how to set up Docker PPA and upgrade Docker.
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$ sudo add-apt-repository ppa:docker-maint/testing
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$ sudo apt-get update
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$ sudo apt-get install docker.io
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Now check the version of installed Docker:
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$ docker --version
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----------
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Docker version 1.5.0-dev, build a78ce5c
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/upgrade-docker-ubuntu.html
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作者：[Dan Nanni][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni
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