The Citadel Groupware Server
First things first, and before you point your mail records to your new Citadel server, you have to tell it what domains to accept e-mail for. I much prefer Citadel's way of handling this as opposed to mucking about in configuration files. To specify the domains for which you're interested in handling e-mail, click on the Advanced menu option, and then the Domain names and Internet e-mail configuration link.
In the resulting page, enter the first domain for which you want to accept mail in the Local host aliases field. Click the Add button, and continue entering more domains as your situation requires (Figure 4).
The Local host aliases field is the only setting that absolutely has to be filled out, but you may want to integrate some more-advanced functionality within this screen as well. You can specify the domains to map to the Global Address List (GAL), indicate smart host addresses if your server isn't sending mail directly or point to a SpamAssassin or real-time blackhole list (RBL) host to scrub incoming mail before it's delivered.
That's it. You now can send and receive e-mail out of your Citadel installation.
There's no technical reason why a local client has to be set up at all. WebCit exposes all of the most-used groupware functionality via a Web interface, and users can begin using that immediately to organize their lives. However, local clients do bring some power to the table, and many users won't be satisfied with a Web interface. Therefore, onward we go.
Depending on the needs of your users, a variety of Linux clients can replace Microsoft Outlook. After many setups, we've found that KDE's Kontact is the easiest personal information manager to back onto a Citadel server, so that's what we use here.
Kontact is the KDE Project's all-in-one personal information manager. In a sense, Kontact simply provides a unified interface to access KMail, KOrganizer, KAddressbook and some notes and news components.
Setting up KMail is a rather intuitive process. If you've ever set up a mail client before, you'll be able to set up KMail without issue. As long as you've set up at least one of your Citadel server's IMAP or POP servers, you can set up KMail to use either. Simply plunk in the URL or IP of your Citadel server, your account credentials and be done with it (Figure 5).
Setting up the calendaring functionality of Kontact is a little more indepth. We've found that the GroupDAV protocol is the easiest and most powerful to set up, so that's what we do here.
One of the few things you need to know is how to construct your GroupDAV URL. Quite simply, your GroupDAV URL is the URL to your Citadel server (including the nonstandard HTTP port if you've told Citadel to listen on a port other than 80) with /groupdav appended to it. In my case, my GroupDAV URL is http://192.168.38.128/groupdav.
To enable KCalendar's groupware functionality, click on the Calendar icon in the left-side pane. At the bottom of the middle pane is a section labeled Calendar. Right-click anywhere in that pane, and select Add. In the resulting window, select the GroupDAV Server option. If you don't see the GroupDAV Server option, it's likely you don't have the kdepim-kresources package installed. Install it, restart Kontact, and you should be good to go.
The Resource Configuration window opens. Enter a name that means something to you in the Name field and your special GroupDAV URL into the URL field. Your user and password credentials are the same ones that you set up when you logged in to Citadel the first time. Click the Update Folder List button, and the bottom Folder Selection pane should populate with Calendar and Tasks radio buttons (Figure 6).
It seems that clicking the check boxes beside the Calendar and Tasks items would enable those items, but the system is a little buggy. In many cases, two instances of Calendar and Tasks show up, as shown in Figure 6. Further, to enable a Calendar or Tasks item, the only way that seems to work is to right-click each item and select Enable from the context menu.
Once you've enabled the Calendar, you can enter items either within Kontact or within WebCit, and the items synchronize as mail is checked or other server contact occurs (Figure 7).
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide