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20150413-1 选题
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Linux Kernel 4.0 Features Live Kernel Patching, PS3 Support
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================================================================================
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**A new stable release of the Linux Kernel [has been announced][1] by Linus Torvalds on the Linux kernel mailing list. **
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Linux 4.0, codenamed ‘Hurr durr I’m a sheep’ — no, really — brings with it a small set of new hardware support, driver improvements, performance tweaks, bug fixes and the like.
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But remarking on the minor-ness of the update, Torvalds’ writes;
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> “Feature-wise, 4.0 doesn’t have all that much special. Much have been made of the new kernel patching infrastructure, but realistically […] we’ve had much bigger changes in other versions. So this is very much a “solid code progress” release.”
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Linus adds that Linux 4.1 is likely to be a ‘bigger release’.
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### New Linux Kernel 4.0 Features ###
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Install Kernel Updates Without Rebooting
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If you’ve ever been put out by the need to reboot your Linux box to finish installing a kernel update you won’t be alone. It’s a minor inconvenience on the desktop, and a major one for servers.
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Reboot-free Kernel Updates
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The ability to install/apply security patches to the Linux kernel “live”, without the need to reboot, has been a long-held want of many Linux enthusiasts for years.
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A slew of third-party projects, like [Oracle’s KSplice][2] and Red Hat’s Kpatch, have sought to offer live patching functionality for certain distributions.
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For servers, enterprise and mission-critical use cases where uptime is priority live kernel patching is a pretty big deal.
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The good news is that Linux 4.0 makes having to reboot to complete a kernel update a thing of the past.
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Well, almost.
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The initial groundwork to support reboot-free patching arrives in this latest release, ready for experienced sysadmins to take advantage of in Linux 4.0.
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Desktop Linux distributions should also be able to take advantage of the feature too (though given the complexity involved in configuring the reboot-less functionality on the end-user side it may be a little way off).
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This infrastructure will continue to be refined and improved on over the course of the 4.x series. As it does so I expect we’ll all start to hear more about it.
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#### Other Changes ####
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Although it is considered a small release the latest Linux kernel manages to squeeze in a welcome set of hardware improvements, new drivers and performance tweaks. These include:
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- Improvements to Intel ‘Skylake’ platform
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- Intel Quark SoC support
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- Various patches to improve Linux running on a Playstation 3
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- TOpen-source AMD Radeon driver supports DisplayPort Audio
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- Various misc HID driver tweaks, including Lenovo compact keyboards, Wacom Cintiq 27QHD
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- Toshiba power settings driver adds USB sleep/charge functionality, rapid charge, sleep w/ music, etc
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- File System tweaks, including F2FS, BtrfFS, etc
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### Install Linux Kernel 4.0 on Ubuntu ###
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Although classed as stable there is, at present, **no need for desktop users or new-comers to go upgrade**.
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The impatient and adept can take a crack at installing Linux 4.0 in Ubuntu 15.04 Beta by grabbing the appropriate set of packages from [Canonical’s mainline kernel archive][3] or by risking a third-party PPA hosted on Launchpad.
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Ubuntu 15.04 Vivid Vervet is due later this month and will ship with Ubuntu Kernel 3.19 (the Ubuntu kernel is the Linux Kernel plus Ubuntu-specific patches that have not been accepted upstream).
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--------------------------------------------------------------------------------
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via: http://www.omgubuntu.co.uk/2015/04/linux-kernel-4-0-new-features
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作者：[Joey-Elijah Sneddon][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]:https://plus.google.com/117485690627814051450/?rel=author
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[1]:https://lkml.org/lkml/2015/4/12/178
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[2]:http://www.omgubuntu.co.uk/2009/10/how-to-install-kernel-updates-without-rebooting
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[3]:http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D
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How to manage remote MySQL databases on Linux VPS using a GUI tool
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================================================================================
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If you need to run a MySQL server on a remote [VPS instance][1], how will you manage databases hosted by the server remotely? Perhaps web-based database administration tools such as [phpMyAdmin][2] or [Adminer][3] will first come to mind. These web-based management tools require a backend web server and PHP engine up and running. However, if your VPS instance is used as a standalone database server (e.g., for a multi-tier app), provisioning a whole LAMP stack for occasional database management is a waste of VPS resource. Worse, the LAMP stack with an additional HTTP port can be a source of security vulnerabilities of your VPS.
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Alternatively, you can turn to a native MySQL client running on a client host. Of course a pure command-line MySQL client (mysql-client) can be your default choice if nothing else. But the capabilities of the command-line client are limited, so it is not suitable for production-level database administration such as visual SQL development, performance tuning, schema validation, etc. If you are looking for full-blown MySQL administration features, a MySQL GUI tool will meet your requirements better.
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### What is MySQL Workbench? ###
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Developed as an integrated database tool environment by Oracle, [MySQL Workbench][4] is more than a simple MySQL client. In a nutshell, Workbench is a cross-platform (e.g., Linux, MacOS X, Windows) GUI tool for database design, development and administration. The Community Edition of MySQL Workbench is available for free under the GPL. As a database administrator, you can use Workbench to configure MySQL server, manage MySQL users, perform database backup and recovery, and monitor database health, all in GUI-based user-frienly environment.
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In this tutorial, let's review how to install and use MySQL Workbench on Linux.
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### Install MySQL Workbench on Linux ###
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To set up remote database administration environment, grab any desktop Linux machine where you will be running MySQL Workbench. While some Linux distributions (e.g., Debian/Ubuntu) carry MySQL Workbench in their repositories, it is a good idea to install it from the official repositories, as they offer the latest version. Here is how to set up the official Workbench repository and install Workbench from it.
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#### Debian-based Desktop (Debia, Ubuntu, Mint): ####
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Go to the [official website][5]. Download and install the DEB file for the repository. Choose one that matches with your environment.
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For example, on Ubuntu 14.10:
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$ wget http://dev.mysql.com/get/mysql-apt-config_0.3.4-2ubuntu14.10_all.deb
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$ sudo dpkg -i mysql-apt-config_0.3.4-2ubuntu14.10_all.deb
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on Debian 7:
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$ wget http://dev.mysql.com/get/mysql-apt-config_0.3.3-1debian7_all.deb
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$ sudo dpkg -i mysql-apt-config_0.3.3-1debian7_all.deb
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When installing the DEB file, you will see the following package configuration menu, and be asked to choose MySQL product to configure.
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Choose "Utilities". Once you are done with configuration, choose "Apply" to save it.
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Finally, update package index, and install Workbench.
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$ sudo apt-get update
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$ sudo apt-get install mysql-workbench
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#### Red Hat-based Desktop (CentOS, Fedora, RHEL): ####
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Go to the [official website][6]. Download and install the RPM repository package for your Linux evironment.
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For example, on CentOS 7:
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$ wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
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$ sudo yum localinstall mysql-community-release-el7-5.noarch.rpm
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on Fedora 21:
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$ wget http://dev.mysql.com/get/mysql-community-release-fc21-6.noarch.rpm
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$ sudo yum localinstall mysql-community-release-fc21-6.noarch.rpm
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Verify that "MySQL Tools Community" repository has been set up.
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$ yum repolis enabled
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Go ahead and install Workbench.
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$ sudo yum install mysql-workbench-community
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### Set up a Secure Remote Database Connection ###
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The next step is to set up a remote connection to your MySQL server running on a VPS. Of course you can connect directly to the remote MySQL server from Workbench GUI (after [enabling remote access][7] in the database server). However, it is a huge security risk to do so, as someone can easily eavesdrop on database access traffic, and a publicly-open MySQL port can be another attack vector.
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A better approach is to disable remote access of MySQL server (i.e., only allow access from 127.0.0.1 of a VPS). Then set up an SSH tunnel between a local client machine and a remote VPS, so that MySQL traffic can be securely relayed via their loopback interfaces. Compared to setting up SSL-based encrypted connections, configuring SSH tunneling requires little effort as it only requires SSH server, which is already deployed on most VPS instances.
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Let's see how we can set up an SSH tunnel for MySQL Workbench.
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In this setup, you don't need to enable remote access of a MySQL server.
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On a local client host where MySQL Workbench will be running, type the following command. Replace 'user' and 'remote_vps' with your own info.
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$ ssh user@remote_vps -L 3306:127.0.0.1:3306 -N
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You will be asked to type an SSH password for your VPS. Once you successfully log in to the VPS, an SSH tunnel will be established between port 3306 of local host and port 3306 of a remote VPS. Note that you won't see any message in the foreground.
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Optionally, you can set the SSH tunnel running in the background. For that, press Ctrl+Z to stop the command, type bg and press ENTER.
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The SSH tunnel will now be running in the background.
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### Manage a Remote MySQL Server with MySQL Workbench ###
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With an SSH tunnel established, you are ready to connect to a remote MySQL server from MySQL Workbench.
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Launch Workbench by typing:
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$ mysql-workbench
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Click on the plus icon at the top of the Workbench screen to create a new database connection. Fill in connection information as follows.
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- **Connection Name**: any description (e.g., My remote VPS database)
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- **Hostname**: 127.0.0.1
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- **Port**: 3306
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- **Username**: MySQL username (e.g., root)
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Note that since the tunnel's local endpoint is 127.0.0.1:3306, the hostname field must be 127.0.0.1, not the IP address/hostname of a remote VPS.
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Once you set up a new database connection, you will see a new box for the connection appear on Workbench window. Click on the box to actually establish a connection to a remote MySQL server.
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Once you are logged in to the MySQL server, you will see various administrative tasks in the left-side panel. Let's review some of common administrative tasks.
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#### MySQL Server Status ####
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This menus shows real-time dashboard of database server resource usage (e.g., traffic, connections, read/write).
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#### Client Connections ####
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The total number of client connections is a critical resource to monitor. This menu shows detailed information of individual client connections.
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#### Users and Privileges ####
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This menu allows you to manage MySQL users, including their resource limits and privileges.
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#### MySQL Server Administration ####
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You can start or stop a MySQL server, and examine its server logs.
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#### Database Schema Management ####
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You can view, change or inspect database schema visually. For that, choose and right-click on any database or table under "Schemas" heading.
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#### Database Query ####
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You can execute any arbitrary query (as long as your login privilege allows), and inspect its result.
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Note that performance statistics and reports are available for MySQL server 5.6 and higher. For 5.5 and lower, the performance section will be grayed out.
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### Conclusion ###
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The clean and intuitive tabbed interface, comprehensive feature sets, and open-source licensing make MySQL Workbench one of the best visual database design and administration tools out there. One known downside of Workbench is its performance. I notice that Workbench sometimes gets sluggish while running queries on a busy server. Despite its less than stellar performance, I still consider MySQL Workbench an essential tool for any professional MySQL database administrator and designer.
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Have you ever used Workbench in your work environment? Or do you recommend any other GUI tool? Feel free to share your experience.
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--------------------------------------------------------------------------------
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via: http://xmodulo.com/remote-mysql-databases-gui-tool.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://xmodulo.com/author/nanni
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[1]:http://xmodulo.com/go/digitalocean
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[2]:http://ask.xmodulo.com/install-phpmyadmin-centos.html
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[3]:http://xmodulo.com/set-web-based-database-management-system-adminer.html
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[4]:http://mysqlworkbench.org/
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[5]:http://dev.mysql.com/downloads/repo/apt/
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[6]:http://dev.mysql.com/downloads/repo/yum/
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[7]:http://xmodulo.com/how-to-allow-remote-access-to-mysql.html
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