Archive for September, 2007

If Java and MySQL are consuming significant CPU (Make my own web site)

Sunday, September 30th, 2007

If Java and MySQL are consuming significant CPU and memory resources, then the installation is still in progress. Often the browser will regain consciousness after the install completes. You may need to hit the Reload button if the Continue button does not become active, but usually that is not required. If the browser will not respond, you may have to restart the browser and try again (from the beginning of the web-based installation). Restarting Tomcat versus Reloading OpenCms Tomcat includes an application for reloading individual servlets without restarting Tomcat. However, it is unclear whether all of the OpenCms classes are garbage-collected. Many users have reported on the opencms-dev list that simply reloading the OpenCms servlet causes strange errors, so it is always best to restart Tomcat rather than reload the individual servlet. MySQL User/Password Changes If you change the username or password for the MySQL database user that OpenCms uses, you will need to edit the following file: $CATALINA_HOME/webapps/opencms/WEB-INF/config/opencms.properties Change the value for the pool.default.user and pool.default.password variables, and restart Tomcat after saving your changes. Finding More Installation Help For more help on installation issues, try the OpenCms developers’ mailing list and archives available at: http://www.opencms.org/opencms/en/development/mailinglist.html. Summary At this point, OpenCms is up and running inside the Tomcat Servlet container with a MySQL database, and configuration is complete. In the next chapter, we’ll take a detailed look at the OpenCms Workplace, the primary tool for content management.
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While OpenCms should function fine without any modifications (Web hosting rating)

Sunday, September 30th, 2007

While OpenCms should function fine without any modifications to any of these files, there are a few changes to one file that are worth making at this time. Edit the opencms-system.xml file. In order to take advantage of email notifications in the Workplace, you will need to configure a few parameters in this file. Find the element. It will contain several mail configuration elements: nobody@nowhere.com Set to the username you want OpenCms to send from. This address will show up in the From: field of outgoing email messages. The element contains information about the SMTP mail server. The first attribute of this element is name. Set the value to the domain name of the SMTP server that it should contact. On Linux and UNIX machines that run Sendmail, this value can usually be set to localhost. The next attribute is protocol, which should be set to smtp for Simple Mail Transport Protocol the standard mail protocol used on the Internet. If your SMTP server requires authentication before a message can be sent (and this is increasingly common), you can use the user and password attributes to set the appropriate account information. If you want to set up “failover” mail hosts (so that if the first server is down, OpenCms can try another), you can simply create additional elements and configure them accordingly. Otherwise, you should delete the extra elements, since they will contain dummy data. Any time you change one of these files, you will need to restart Tomcat in order for OpenCms to pick up the changes. Installation Troubleshooting Not all installations go flawlessly. In this section, we will look at the most common installation problems and see how to fix them. Additionally, the OpenCms website particularly the developers’ mailing-list archives is a good resource for troubleshooting information. Crashes During Module Installation Occasionally, some browsers will hang (stop responding) during the lengthy module installation process. If this occurs, do not close the browser. Wait for twenty minutes (ample time for the process to complete) and then see if the browser will respond. You can often find out whether the installation is complete by checking the server’s resources.
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Manually Configuring Settings On occasion you (Web hosting company) may need

Saturday, September 29th, 2007

Manually Configuring Settings On occasion you may need to set or alter some of operating parameters of OpenCms manually. This section briefly describes the configuration files that OpenCms uses. The OpenCms configuration files are stored in a common directory: $CATALINA_HOME/ webapps/opencms/WEB-INF/config/. The opencms.properties file conforms to the Java standard for properties files. For the most part, the opencms.properties file contains database pool information, but it also contains the MAC address settings, the server name, and the property that determines whether the installation wizard is enabled (see above). The rest of the files in the config/ directory are in XML. Here is an overview of what each file contains: opencms.xml: This file contains information on which Java classes OpenCms should load when it is configuring the server (at startup). opencms-system.xml: Many of the main configuration parameters for OpenCms are stored in this file, including information on which locales are available, parameters for cache tuning, and site configuration parameters. (It is possible in OpenCms 6 to host multiple sites on one instance of OpenCms.) opencms-modules.xml: We already had our first encounter with the concept of modules during installation of OpenCms. Every module has its own configuration directives. This file is where all of the settings for all installed modules are stored. After a clean installation, my opencms-modules.xml file is over 2000 lines. Needless to say, it is tedious to edit this file. Fortunately, it is also rare that this file needs editing. opencms-workplace.xml: The OpenCms Workplace is the “back office” component of OpenCms. This configuration file stores settings for the Workplace. opencms-vfs.xml: OpenCms stores content in the database, but in such a way as to mimic a standard file system. Since this system looks and acts like a file system, though it is not part of the server’s actual file system, it is called the Virtual File System (VFS). The opencms-vfs.xml file stores configuration parameters for the VFS. opencms-search.xml: OpenCms has a built-in search engine one based on the fantastic Lucene Open Source search library. This file contains configuration parameters for OpenCms’s search engine. opencms-importexport.xml: Like any good content management system, OpenCms can import and export its contents (this is useful for upgrading, backing up, or even migrating to another platform). This file makes it possible to fine tune aspects of that process.
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If the window does not pop up, you (Email web hosting)

Friday, September 28th, 2007

If the window does not pop up, you will need to change the settings to your pop-up blocker in order to allow OpenCms to open new windows. Secondly, you may notice the warning message that says that the installer is now locked. That means that you (or anyone else, for that matter) cannot run the installer again without first unlocking it. If for some reason you need to reinstall, you will need to unlock the installer. To unlock the installer, you will have to edit the file $CATALINA_HOME/webapps/ opencms/WEB-INF/config/opencms.properties and change the value of the property wizard.enabled (located at the very bottom of the file) to true. Only enable this if you must reinstall OpenCms, since it is a major security risk to have this flag enabled. At all other times, leave the value set to false. Installation is now complete. You can safely continue on to the next chapter to learn about the Workplace. The remainder of this chapter contains information on advanced configuration and installation troubleshooting.
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Firstly, when this screen loads, a new window (Frontpage web hosting)

Thursday, September 27th, 2007

Firstly, when this screen loads, a new window should pop up as well one that looks like this:
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The information box describes the requirements for browsers (Adelphia web hosting)

Wednesday, September 26th, 2007

The information box describes the requirements for browsers that are going to access the online OpenCms Workplace (content authors, editors, and managers, as well as administrators will use the Workplace). OpenCms supports MS Internet Explorer 5.5 and up, as well as all browsers based on Mozilla 1.4 and up (that includes the Firefox browser). But you must enable JavaScript and cookies in your browser before you will be able to use Workplace. Additionally, you will need to allow popups from the OpenCms server. Select the yes radio button and click Finish. This will take you to the final screen of the installation wizard.
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Once the modules (Free web hosting with ftp) are installed, the Continue button

Tuesday, September 25th, 2007

Once the modules are installed, the Continue button at the bottom of the screen will be activated, and you can click it to go on to Browser configuration.
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$ ifconfig eth0 eth0 Link (Adelphia web hosting) encap:Ethernet HWaddr 4F:A1:F1:C2:36:BF

Tuesday, September 25th, 2007

$ ifconfig eth0 eth0 Link encap:Ethernet HWaddr 4F:A1:F1:C2:36:BF inet addr:10.12.7.14 Bcast:10.12.7.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8871 errors:0 dropped:0 overruns:0 frame:0 TX packets:1359 errors:0 dropped:0 overruns:0 carrier:1 collisions:0 txqueuelen:1000 RX bytes:1575038 (1.5 MiB) TX bytes:191763 (187.2 KiB) Interrupt:11 Base address:0xc000 Memory:cffff000-cfffffff The field HWaddr (in the highlighted line) contains the MAC address: 4f:A1:F1:C2:36:BF. Finding your MAC Address on Windows To find your MAC address on Windows, open a command prompt and type the following command: ipconfig /all. Look for the first line that begins Physical Address:…… The series of hexadecimal numbers at the end of that row is the MAC address for example, 4f:A1:F1:C2:36:BF. (If you have multiple Ethernet cards, you can use the MAC for any of them they are all unique.) If You Don’t Have a MAC Address… If you do not have a MAC address, you can leave the field blank and OpenCms will generate a fake one for you, but you could run into problems if your ID matches somebody else’s (though the chances of this are minuscule). Continuing Installation The next field instructs you to Enter the URL of your OpenCms site. It will attempt to generate a URL for you, usually with the domain name localhost. If your machine has a domain name, you may want to substitute that instead of localhost (e.g. http:// myhost.mydomain.com:8080). The following field is labeled Enter a name for your OpenCms server. This is used primarily for tagging log messages. If you are planning on running multiple instances of OpenCms on the same server, you should set this to a value that will identify this instance of OpenCms (e.g. MattsOpenCms), otherwise, you can leave this at its default. Click Continue to run the module installer. For the next several minutes, OpenCms will install and configure all of the modules you chose a few screens ago. This is processor, disk, and memory intensive, so the entire system will likely experience slowing.
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On this screen, you will be prompted to (Web hosting script)

Thursday, September 20th, 2007

On this screen, you will be prompted to enter or verify some basic information about OpenCms. For the first field, you are instructed to Enter your server s ethernet (MAC) address. A MAC (Media Access Control) address is an identifier assigned to Ethernet hardware by the manufacturer of the Ethernet card. Every Ethernet card has its own unique identifier. OpenCms uses this address to generate system-specific (and unique) identifiers (UUIDs Universally Unique Identifiers). While it is easy for you to get your MAC address, the Java security model prevents Java applications from accessing that information, so you have to enter this information manually. Finding your MAC Address on Linux To find your MAC address on Linux, you can use the command-line program ifconfig to give you information about the configuration of your Ethernet interfaces. Most of the time, you will want information about the first Ethernet card on your system, so you will use the following command:
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There are over fifty modules on the Module (Web server type)

Wednesday, September 19th, 2007

There are over fifty modules on the Module selection screen all of which are selected by default. A few of them provide crucial functions to OpenCms. Some just provide tutorials, example code, how-to documents, and manuals. For the first install, it is best to leave everything selected. On a production system, you may want to uncheck the Alkacon Documentation modules and the TemplateOne demo modules. A word of warning: Do not deselect a module unless you know what it does. Some modules provide tools that are necessary for a fully functional OpenCms installation. Click Continue to go on to the Settings screen.
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