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20150625-2 选题
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Screen Capture Made Easy with these Dedicated Tools
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================================================================================
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"A picture is worth a thousand words", a phrase which emerged in the USA in the early part of the 20th century, refers to the notion that a single still image can present as much information as a large amount of descriptive text. Essentially, pictures convey information more effectively and efficiently than words can.
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A screenshot (or screengrab) is a snapshot or picture captured by a computer to record the output of a visual device. Screen capture software enable screenshots to be taken on a computer. This type of software has lots of uses. As an image can illustrate the operation of computer software well, screenshots play an important role in software development and documentation. Alternatively, if you have a technical problem with your computer, a screenshot allows a technical support department to understand the problems you are facing. Writing computer-related articles, documentation and tutorials is nigh on impossible without a good tool for creating screenshots. Screenshots are also useful to save snippets of anything you have on your screen, particularly when it can not be easily printed.
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Linux has a good selection of open source dedicated screenshot programs, both graphical and console based. For a feature-rich dedicated screenshot utility, look no further than Shutter. This tool is a superb example of a small open source tool. But there are some great alternatives too.
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Screen capture functionality is not only provided by dedicated applications. GIMP and ImageMagick, two programs which are primarily image manipulation tools, also offer competent screen capturing functionality.
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----------
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### Shutter ###
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Shutter is a feature-rich screenshot application. You can take a screenshot of a specific area, window, your whole screen, or even of a website - apply different effects to it, draw on it to highlight points, and then upload to an image hosting site, all within one window.
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Features include:
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- Take a screenshot of:
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- a specific area
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- window
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- the complete desktop
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- web pages from a script
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- Apply different effects to the screenshot
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- Hotkeys
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- Print
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- Take screenshot directly or with a specified delay time
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- Save the screenshots to a specified directory and name them in a convenient way (using special wild-cards)
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- Fully integrated into the GNOME Desktop (TrayIcon etc)
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- Generate thumbnails directly when you are taking a screenshot and set a size level in %
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- Shutter session collection:
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- Keep track of all screenshots during session
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- Copy screeners to clipboard
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- Print screenshots
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- Delete screenshots
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- Rename your file
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- Upload your files directly to Image-Hosters (e.g. http://ubuntu-pics.de), retrieve all the needed links and share them with others
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- Edit screenshots directly using the embedded drawing tool
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- Website: [shutter-project.org][1]
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- Developer: Mario Kemper and Shutter Team
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- License: GNU GPL v3
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- Version Number: 0.93.1
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----------
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### HotShots ###
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HotShots is an application for capturing screens and saving them in a variety of image formats as well as adding annotations and graphical data (arrows, lines, texts, ...).
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You can also upload your creations to the web (FTP/some web services). HotShots is written with Qt.
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HotShots is not available in Ubuntu's Software Center. But it's easy to install by typing at the command line:
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sudo add-apt-repository ppa:ubuntuhandbook1/apps
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sudo apt-get update
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sudo apt-get install hotshots
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Features include:
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- Simple to use
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- Full featured
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- Built-in editor
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- Hotkeys
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- Built-in magnification
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- Freehand and multi-screen capture
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- Supported Output Formats: Black & Whte (bw), Encapsulated PostScript (eps, epsf), Encapsulated PostScript Interchange (epsi), OpenEXR (exr), PC Paintbrush Exchange (pcx), Photoshop Document (psd), ras, rgb, rgba, Irix RGB (sgi), Truevision Targa (tga), eXperimental Computing Facility (xcf), Windows Bitmap (bmp), DirectDraw Surface (dds), Graphic Interchange Format (gif), Icon Image (ico), Joint Photographic Experts Group 2000 (jp2), Joint Photographic Experts Group (jpeg, jpg), Multiple-image Network Graphics (mng), Portable Pixmap (ppm), Scalable Vector Graphics (svg), svgz, Tagged Image File Format (tif, tiff), webp, X11 Bitmap (xbm), X11 Pixmap (xpm), and Khoros Visualization (xv)
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- Internationalization support: Basque, Chinese, Czech, French, Galician, German, Greek, Italian, Japanese, Lithuanian, Polish, Portuguese, Romanian, Russian, Serbian, Singhalese, Slovak, Spanish, Turkish, Ukrainian, and Vietnamese
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- Website: [thehive.xbee.net][2]
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- Developer: xbee
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- License: GNU GPL v2
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- Version Number: 2.2.0
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----------
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### ScreenCloud ###
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ScreenCloud is an easy to use open source screenshot tool.
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With this software, users can take a screenshot using one of the 3 hotkeys or simply click the ScreenCloud tray icon. Users can choose where you want to save the screenshot.
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If you choose to upload your screenshot to the screencloud website, a link will automatically be copied to your clipboard. This can be shared with friends or colleagues via email or in an IM conversation. All they have to do is click the link and look at your screenshot.
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Features include:
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- Capture full screen, window or selection
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- Fast and easy: Snap a photo, paste the link, done
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- Free hosting of your screenshots
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- Hotkeys
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- Set timer delay
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- Enable 'Capture window borders'
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- Enable/Disable Notifications
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- Set app to run on start up
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- Adjust account/upload/filename/shortcut settings
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- Cross platform tool
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- Plugin support, save to Dropbox, Imgur, and more
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- Supports uploading to FTP and SFTP servers
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- Website: [screencloud.net][3]
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- Developer: Olav S Thoresen
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- License: GNU GPL v2
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- Version Number: 1.2.1
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----------
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### KSnapshot ###
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KSnapshot is a simple utility for taking screenshots. It can capture images of the whole desktop, a single window, a section of a window or a selected region. Images can then be saved in a variety of different formats.
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KSnapshot also allows users to use hotkeys to take a screenshot. Besides saving the screenshot, it can be copied to the clipboard or opened with any program that is associated with image files.
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KSnapshot is part of the KDE 4 graphics module.
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Features include:
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- Save snapshot in multiple formats
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- Snapshot delay
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- Exclude window decorations
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- Copy the snapshot to the clipboard
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- Hotkeys
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- Can be scripted using its D-Bus interface
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- Website: [www.kde.org][4]
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- Developer: KDE, Richard J. Moore, Aaron J. Seigo, Matthias Ettrich
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- License: GNU GPL v2
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- Version Number: 0.8.2
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--------------------------------------------------------------------------------
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via: http://www.linuxlinks.com/article/2015062316235249/ScreenCapture.html
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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](https://linux.cn/) 荣誉推出
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[1]:http://shutter-project.org/
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[2]:http://thehive.xbee.net/
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[3]:https://screencloud.net/
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[4]:https://www.kde.org/applications/graphics/ksnapshot/
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How to Provision Swarm Clusters using Docker Machine
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================================================================================
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Hi all, today we'll learn how we can deploy Swarm Clusters using Docker Machine. It serves the standard Docker API, so any tool which can communicate with a Docker daemon can use Swarm to transparently scale to multiple hosts. Docker Machine is an application that helps to create Docker hosts on our computer, on cloud providers and inside our own data center. It provides easy solution for creating servers, installing Docker on them and then configuring the Docker client according the users configuration and requirements. We can provision swarm clusters with any driver we need and is highly secured with TLS Encryption.
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Here are some quick and easy steps on how to provision swarm clusters with Docker Machine.
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### 1. Installing Docker Machine ###
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Docker Machine supports awesome on every Linux Operating System. First of all, we'll need to download the latest version of Docker Machine from the Github site . Here, we'll use curl to download the latest version of Docker Machine ie 0.2.0 .
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For 64 Bit Operating System
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# curl -L https://github.com/docker/machine/releases/download/v0.2.0/docker-machine_linux-amd64 > /usr/local/bin/docker-machine
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For 32 Bit Operating System
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# curl -L https://github.com/docker/machine/releases/download/v0.2.0/docker-machine_linux-i386 > /usr/local/bin/docker-machine
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After downloading the latest release of Docker Machine, we'll make the file named docker-machine under /usr/local/bin/ executable using the command below.
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# chmod +x /usr/local/bin/docker-machine
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After doing the above, we'll wanna ensure that we have successfully installed docker-machine. To check it, we can run the docker-machine -v which will give output of the version of docker-machine installed in our system.
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# docker-machine -v
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To enable Docker commands on our machines, make sure to install the Docker client as well by running the command below.
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# curl -L https://get.docker.com/builds/linux/x86_64/docker-latest > /usr/local/bin/docker
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# chmod +x /usr/local/bin/docker
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### 2. Creating Machine ###
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After installing Machine into our working PC or device, we'll wanna go forward to create a machine using Docker Machine. Here, in this tutorial we'll gonna deploy a machine in the Digital Ocean Platform so we'll gonna use "digitalocean" as its Driver API then, docker swarm will be running into that Droplet which will be further configured as Swarm Master and another droplet will be created which will be configured as Swarm Node Agent.
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So, to create the machine, we'll need to run the following command.
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# docker-machine create --driver digitalocean --digitalocean-access-token <API-Token> linux-dev
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**Note**: Here, linux-dev is the name of the machine we are wanting to create. <API-Token> is a security key which can be generated from the Digital Ocean Control Panel of the account holder of Digital Ocean Cloud Platform. To retrieve that key, we simply need to login to our Digital Ocean Control Panel then click on API, then click on Generate New Token and give it a name tick on both Read and Write. Then we'll get a long hex key, thats the <API-Token> now, simply replace it into the command above.
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Now, to load the Machine configuration into the shell we are running the comamands, run the following command.
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# eval "$(docker-machine env linux-dev)"
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Then, we'll mark our machine as ACTIVE by running the below command.
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# docker-machine active linux-dev
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Now, we'll check whether its been marked as ACTIVE "*" or not.
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# docker-machine ls
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### 3. Running Swarm Docker Image ###
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Now, after we finish creating the required machine. We'll gonna deploy swarm docker image in our active machine. This machine will run the docker image and will control over the Swarm master and node. To run the image, we can simply run the below command.
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# docker run swarm create
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If you are trying to run swarm docker image using **32 bit Operating System** in the computer where Docker Machine is running, we'll need to SSH into the Droplet.
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# docker-machine ssh
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#docker run swarm create
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#exit
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### 4. Creating Swarm Master ###
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Now, after our machine and swarm image is running into the machine, we'll now create a Swarm Master. This will also add the master as a node. To do so, here's the command below.
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# docker-machine create \
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-d digitalocean \
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--digitalocean-access-token <DIGITALOCEAN-TOKEN>
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--swarm \
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--swarm-master \
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--swarm-discovery token://<CLUSTER-ID> \
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swarm-master
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### 5. Creating Swarm Nodes ###
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Now, we'll create a swarm node which will get connected with the Swarm Master. The command below will create a new droplet which will be named as swarm-node and will get connected with the Swarm Master as node. This will create a Swarm cluster across the two nodes.
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# docker-machine create \
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-d digitalocean \
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--digitalocean-access-token <DIGITALOCEAN-TOKEN>
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--swarm \
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--swarm-discovery token://<TOKEN-FROM-ABOVE> \
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swarm-node
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### 6. Connecting to the Swarm Master ###
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We, now connect to the Swarm Master so that we can deploy Docker containers across the nodes as per the requirement and configuration. To load the Swarm Master's Machine configuration into our environment, we can run the below command.
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# eval "$(docker-machine env --swarm swarm-master)"
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After that, we can run the required containers of our choice across the nodes. Here, we'll check if everything went fine or not. So, we'll run **docker info** to check the information about the Swarm Clusters.
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# docker info
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### Conclusion ###
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We can pretty easily create Swarm Cluster with Docker Machine. This method is a lot productive because it reduces a lot of time of a system admin or users. In this article, we successfully provisioned clusters by creating a master and a node using a machine with Digital Ocean as driver. It can be created using any driver like VirtualBox, Google Cloud Computing, Amazon Web Service, Microsoft Azure and more according to the need and requirement of the user and the connection is highly secured with TLS Encryption. If you have any questions, suggestions, feedback please write them in the comment box below so that we can improve or update our contents. Thank you ! Enjoy :-)
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--------------------------------------------------------------------------------
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via: http://linoxide.com/linux-how-to/provision-swarm-clusters-using-docker-machine/
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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](https://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/arunp/
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