Help. Cool stuff. Die Open Source Lösung XEN zur Virtualisierung im Vergleich mit. Editorial Impressum Aktuell Jubiläum: 15 Jahre ORDIX News Die ORDIX News feiert Geburtstag: 15 Jahre interessante Fachartikel, Praxisberichte und Produkttestberichte. Larry Ratlos: Datenbankblöcke optimal füllen ORDIX Ausbildung Dem Nachwuchs eine Chance 007 erobert das DOAG Casino Royal Rückblick DOAG Konferenz und Schulungstag 2006. Betriebssysteme Virtualisieren mit XEN Vertiefende Einblicke in die Open Source Virtualisierungslösung XEN und die Möglichkeiten von XEN im Vergleich zu kommerziellen Produkten. ZFS - Das ultimative Dateisystem Jetzt steht unter Solaris 10 das neue Feature ZFS zur Verfügung, das sowohl ein Dateisystem als auch ein Volumemanager mit völlig neuartigem Ansatz ist.
Datenbanken Komprimierung von Index Organized Tables Das Komprimieren von indexorganisierten Tabellen unter Oracle mit Hilfe der KEY COMPRESSION. Oracle Objekttypen von A - Z (Teil II): Typen mit "D" In diesem Teil der Reihe stellen wir Ihnen die Objekttypen DATABASE LINK, DIMENSION und DIRECTORY vor. XMLType. Mail Queue Monitoring. Mail Queue Overview Incoming and outgoing mail is processed by postfix in a series of queues; normally, mail moves from the incoming queue to the active queue, from which it is delivered. If delivery is deferred, mail is moved to the deferred queue, and automatically reprocessed later.
Additionally, mail can be put in the hold queue, which will prevent it from being delivered until it is manually removed from the hold queue. Monitoring Queues Queues can be monitored from within the admin console; select Manage Mail Queues from the left sidebar and your queue information will be shown. Troubleshooting Queue Monitoring Common Errors The most common problem is authentication to the mta server. Regenerating keys may very well fix this however, one other place to look is your /var/log/secure file. Sshd[16312]: Authentication refused: bad ownership or modes for directory /opt/zimbra It's possible you only need to fix your ownership and permissions. su - zimbra zmcontrol stop exit Regenerating Keys. Split DNS. Installations of Zimbra behind a firewall (or NAT Router) often require the creation of some form of split DNS, also called split-horizon or dual-horizon DNS. This is a DNS installation where machines receive different IP address answers to queries depending on whether they are (commonly) inside or outside a firewall and an IP address reply from the DNS server gives a Private Network IP address that is different than the Public IP of your internet connection.
For further information on Private Network IP addresses see the following article: This is because the Postfix mail system used by Zimbra performs a DNS MX lookup for the Zimbra server followed by a DNS A lookup when attempting to route email to the back-end message store. Frequently, this is the same physical host as Postfix. The DNS server frequently returns the external address of the mail host, not the internal address. Attention! Install Bind on Red Hat Enterprise Linux. Outgoing SMTP Authentication. Overview When you need to route all outgoing mail through your ISP's MTA, and that MTA requires that you authenticate, certain settings in postfix are required. For this example, we will use as the outgoing relay, as the port number (often 25 or 587), as the authentication user, as the password. The outbound destination should be the canonical address. postfix will resolve CNAMEs to canonical addresses and then use that to lookup the username and password .
Godaddy example: smtpout.secureserver.net is really smtp.starfieldtech.com, so make sure you enter smtp.starfieldtech.com nslookup smtpout.secureserver.net ... Setting a relay host see also Sending mail through an external relay Set the relay host in the admin console, MTA tab to point to your ISPs outgoing mail server. You may have to set the port, as well. Zmprov ms server.domain.com zimbraMtaRelayHost mailrelay.example.com Enabling SMTP authentication echo mailrelay.example.com > /opt/zimbra/conf/relay_password Create a postfix lookup table: A Single Command Install of Thunderbird 3 beta 3 on Ubuntu | Kab. Mozilla’s released a few weeks ago version 3 beta 3 of it Email Client, Thunderbird. This beta release still full of bugs and should not be used on a production box or as used as your principal email client. See the list of bugs in Thunderbird 3 beta 3 before going ahead to install.
Anyway, this installation guide does not replace Thunderbird 2.0.0, if you have it installed, instead you’ll be able to test Thunderbird 3 beta 3 alongside Thunderbird 2. First thing, backup your current Thunderbird profile — if you don’t have any version Thunderbird installed, then skip this line. Mozilla Thunderbird stores all your personal settings, such as your mail, passwords and extensions, in a profile.
You’ll find it in your ~/.mozilla-thunderbird folder. Copy and paste in a terminal The line of code above backs up your current profile in the thunderbird_backup directory in your Home Folder. Thunderbird 3 beta 3 was released in 43 different languages (Hebrew was dropped from this release). Fedora People. Fedora Navigation Home Name Last modified Size Parent Directory - repodata/ 03-May-2011 19:18 - kernel-2.6.32.39-175.xendom0.fc13.x86_64.rpm 03-May-2011 19:16 20M kernel-devel-2.6.32.39-175.xendom0.fc13.x86_64.rpm 03-May-2011 19:17 6.3M kernel-firmware-2.6.32.39-175.xendom0.fc13.noarch.rpm 03-May-2011 19:18 1.0M kernel-headers-2.6.32.39-175.xendom0.fc13.x86_64.rpm 03-May-2011 19:16 775K The Fedora Project is maintained and driven by the community and sponsored by Red Hat.
This is a community maintained site. Red Hat is not responsible for content. IP Subnet Rechner. Dieser IP-Rechner errechnet zu einer IP-Adresse und Netzmaske die zugehörige Broadcastadresse, die Cisco Wildcard Maske und den Hostbereich. Durch die Angabe einer weiteren Netzmaske können Sie Sub- und Supernetze errechnen lassen. Erklärung Dieser IP-Rechner errechnet zu einer IP-Adresse und Netzmaske die zugehörige Broadcastadresse, die Cisco Wildcard Maske und den Hostrange.
Durch die Angabe einer weiteren Netzmaske können Sie Sub- und Supernetze errechnen lassen. Geben Sie die Netzmaske in CIDR Schreibweise (/22) oder als "dotted decimals" (255.255.252.0) ein. Inverse Netzmasken werden erkannt. Achten Sie auf die Lücke zwischen den Bits der Adressen: Die ersten Bits gehören zum Netzwerkteil und der zweite Teil gehört zum Hostteil der Adresse.
Die Klasse eines Netzwerks wird über die ersten Bits identifiziert. diese sind durch eine andere Farbe gekennzeichnet. Wenn Ihr Netzwerk private Adressen nach RFC 1918 verwendet, wird dies entsprechend angegeben. Technik & Know-how: Wie Sie mit der Fritz Box zwei Netzwerke sic. Paravirtualization With Xen On CentOS 5.4 (x86_64) | HowtoForge. Version 1.0 Author: Falko Timme <ft [at] falkotimme [dot] com> Follow me on Twitter Last edited 12/09/2009 This tutorial provides step-by-step instructions on how to install Xen (version 3.0.3) on a CentOS 5.4 (x86_64) system. Xen lets you create guest operating systems (*nix operating systems like Linux and FreeBSD), so called "virtual machines" or domUs, under a host operating system (dom0). Using Xen you can separate your applications into different virtual machines that are totally independent from each other (e.g. a virtual machine for a mail server, a virtual machine for a high-traffic web site, another virtual machine that serves your customers' web sites, a virtual machine for DNS, etc.), but still use the same hardware.
This saves money, and what is even more important, it's more secure. If the virtual machine of your DNS server gets hacked, it has no effect on your other virtual machines. Plus, you can move virtual machines from one Xen server to the next one. 1 Preliminary Note. Welcome to toracat's CentOS Home Page! Meet OpenVPN. If your company has people on the road, such as sales or technical people, a VPN is a good method for letting them access data on the company network.
Many different VPN solutions can be bought, but many are free. Here, I discuss only solutions you can set up without buying a commercial VPN product. The main VPN solution used for more complex tasks is IPsec; some people use PPTP. Although PPTP is usable, security flaws have occurred in its past, and it simply does not match up to IPsec.
IPsec in tunnel mode would be a much better solution, were it not for the crippled Windows-client implementation: Windows XP/2000 clients can't use IPsec in tunnel mode without using L2TP. There is nothing wrong with L2TP security-wise, but it increases latency--through the need for both PPP and L2TP processes--and increases packet-overhead, slowing down connections. Open-source servers have not had much experience with L2TP yet, so using open source for it is problematic at this time. The Security Setup. OpenVPN - Fachschaft Informatik Wiki. Aus Hochschule Darmstadt - Fachschaft Informatik Wiki [ Bearbeiten ] OpenVPN Seit Juli 2008 gibt es die Möglichkeit sich in das studentische Netzwerk per OpenVPN einzuwählen.
Dies klappt über das WLAN, LAN aber auch von Extern. Das gibt die Möglichkeit auf Dienste mit IP-Adressenbeschränkung auch von zu Hause zuzugreifen (wie beispielsweise DBIS oder IPTV ) . [ Bearbeiten ] Einrichtung Host: vpn.fbihome.de Protokoll: tcp Port: 443 Type: tap (Bridge) Zugangsdaten: Benutzer+Passwort ( Studaccount oder USERV-Account) Kompression: lzo SSL/TLS Certificates: deutsche-telekom-root-ca-2.pem [ Bearbeiten ] Einrichtung unter Windows Fertige Konfiguration für Windows (für Linux einfach "Downgrade privileges after initialization" in der Datei aktivieren). [ Bearbeiten ] GUI für openvpn Wer gern die kalte Wahrheit hinter bunten Knöpfen versteckt, findet unter eine grafische Oberfläche für openvpn. . [ Bearbeiten ] Anmerkungen Durch Open-VPN wird ein neuer LAN-Adapter erstellt. PW.txt. OpenVPN. From Gentoo Linux Wiki Introduction There are as many advantages to VPN tunnels as there are different VPN scenarios.
One easy implementation is the " OpenVPN via tun-device" solution. Example: You work from home (your office) and have a server in a data centre, you want exclusive access to some services like ftp, mysql and sshd(the world of unethical hackers has grown to a very large unknown number, excluding “script kiddies” that we all love so much), a great precaution is not to run anything on default ports another being not to run any listening daemons open to the internet. A VPN is by far the best solution. Further more you can "dial in" when you need access to the VPN network, multiple clients can connect to the server too. Disclaimer : While this setup most likely will not cause any problems, it may not be perfect for your system.
Kernel Configuration Make Sure your kernel has been configured for TUN/TAP driver support. cd /usr/src/linux make menuconfig 2.6-based kernels reboot vi vars . . Liferay Portal 4 - Portlet development guide. Struts-path This option is only useful when using the Liferay StrutsPortlet framework. Suppose the struts-path value is "mail". This tells the portal that all requests with the path mail/* are considered part of this portlet's scope.
Users who request paths that match mail/* will only be granted access if they also have access to this portlet. Configuration-path The configuration-path value is a Struts path that allows users to configure the portlet at runtime. Indexer-class The indexer-class value must be a class that implements com.liferay.util.lucene.Indexer and is called to create or update a search index for the portlet. scheduler-class The scheduler-class value must be a class that implements com.liferay.portal.job.Scheduler and is called to schedule Quartz jobs for this portlet. portlet-url-class The portlet-url-class value must be a class that extends com.liferay.portlet.PortletURLImplWrapper. Portlet-data-handler-class smtp-message-listener-class preferences-company-wide maximize-edit.