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• My server freezes within a few hours of logging out. Staying logged in keeps the server running

  - by HappyEngineer

  I have an Ubuntu Godaddy server I use to host mail and webapps. It started having problems a couple months ago. It would lock up and stop responding to anything. I couldn't ssh into it, so I'd have godaddy power cycle the server. I have never seen anything that looked suspicious in the var logs (although I'm no expert at reading them). An fsck turned up no problems. Godaddy replaced the ram, but found no hardware problems. I started logging the output from "top" to a log file and found that even that stops running when the server freezes. Now, here is the crazy part: It got so bad that it would actually go down every few hours, but then it stopped going down. I eventually realized I had left an ssh terminal logged into the machine running top. This seemed unlikely to be a reason, but after the server was up with no problems for a full week (remember, it had been going down after just a few hours), I disconnected from the ssh session. Lo and behold, within a few hours the server froze again! I had them power cycle again and then left another ssh session open with top. It has been going without problems for 8 days now. I told others about this and they hardly believe me. I simply can't imagine what is going on. I don't know what else to try other than to just get a new server and reinstall everything. Does anyone have any ideas about what I can look for to determine what the cause is? Is it possible there's some sort of exploit on the server which only runs if everyone is logged out of the system? EDIT: The power management gone haywire sounds plausible, so I've modified the /boot/grub/menu.lst to boot with acpi=off and apm=off. It appears to have prevented kacpid and kacpid_notify from being in the process list, so I assume I did that right. I've disconnected all my sessions from the server. I'll check later tonight to see if it's still up. If it goes down then I'll try the pinging process idea. EDIT: It went down again. It lasted about a day. I've had them reboot, so now I'll try running "nohup ping -i 5 google.com &" and then disconnect. If it goes down again I'll come back. Hopefully someone will have some more ideas.

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• On a router, how do I block wan access for a particular machine without blocking its access to the local network?

  - by HappyEngineer

  On my tp-link TL-WR1043ND router I want to prevent a particular machine from having access to the WAN while still allowing that machine to access other machines on the LAN. My assumption is that I need to do something in the "Access Control" section, however the problem is that it wants an ip range or domain name for the target of the rule. The router uses DHCP to get an address from the WAN, so I don't have any guarantee what the ip address of the wan will be. If the answer is that it's not possible with this router, could someone describe how to do it using OpenWRT instead?

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• I have a WinXP machine with 2 ethernet ports. One is connected to a LAN, another is connected to a WAN. How do I make this work?

  - by HappyEngineer

  I have a WinXP machine which has 2 ethernet ports. The information I've found indicates that the first nic in the advanced settings list is the one that receives all traffic. I'd like to configure them so that all traffic destined for a particular IP range goes to one nic and the rest goes to the other nic. Is that possible? If so, do I need additional software like zonealarm to shape the traffic?

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• w3schools xsd example won't work with dom4j. How do I use dom4j to validate xml using xsds?

  - by HappyEngineer

  I am trying to use dom4j to validate the xml at http://www.w3schools.com/Schema/schema_example.asp using the xsd from that same page. It fails with the following error: org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'shiporder'. I'm using the following code: SAXReader reader = new SAXReader(); reader.setValidation(true); reader.setFeature("http://apache.org/xml/features/validation/schema", true); reader.setErrorHandler(new XmlErrorHandler()); reader.read(in); where in is an InputStream and XmlErrorHandler is a simple class that just logs all errors. I'm using the following xml file: <?xml version="1.0" encoding="ISO-8859-1"?> <shiporder orderid="889923" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="test1.xsd"> <orderperson>John Smith</orderperson> <shipto> <name>Ola Nordmann</name> <address>Langgt 23</address> <city>4000 Stavanger</city> <country>Norway</country> </shipto> <item> <title>Empire Burlesque</title> <note>Special Edition</note> <quantity>1</quantity> <price>10.90</price> </item> <item> <title>Hide your heart</title> <quantity>1</quantity> <price>9.90</price> </item> </shiporder> and the corresponding xsd: <?xml version="1.0" encoding="ISO-8859-1" ?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:simpleType name="stringtype"> <xs:restriction base="xs:string"/> </xs:simpleType> <xs:simpleType name="inttype"> <xs:restriction base="xs:positiveInteger"/> </xs:simpleType> <xs:simpleType name="dectype"> <xs:restriction base="xs:decimal"/> </xs:simpleType> <xs:simpleType name="orderidtype"> <xs:restriction base="xs:string"> <xs:pattern value="[0-9]{6}"/> </xs:restriction> </xs:simpleType> <xs:complexType name="shiptotype"> <xs:sequence> <xs:element name="name" type="stringtype"/> <xs:element name="address" type="stringtype"/> <xs:element name="city" type="stringtype"/> <xs:element name="country" type="stringtype"/> </xs:sequence> </xs:complexType> <xs:complexType name="itemtype"> <xs:sequence> <xs:element name="title" type="stringtype"/> <xs:element name="note" type="stringtype" minOccurs="0"/> <xs:element name="quantity" type="inttype"/> <xs:element name="price" type="dectype"/> </xs:sequence> </xs:complexType> <xs:complexType name="shipordertype"> <xs:sequence> <xs:element name="orderperson" type="stringtype"/> <xs:element name="shipto" type="shiptotype"/> <xs:element name="item" maxOccurs="unbounded" type="itemtype"/> </xs:sequence> <xs:attribute name="orderid" type="orderidtype" use="required"/> </xs:complexType> <xs:element name="shiporder" type="shipordertype"/> </xs:schema> The xsd and xml file are in the same directory. What is the problem?

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• How do I substitute an xsd when using dom4j?

  - by HappyEngineer

  I'm using dom4j to load an xml file which references an xsd. If the xml file references the xsd http://foo/bar.xsd, how can I tell dom4j to instead use an xsd file located in the classpath? I was hoping that I could open an inputstream to the local xsd and then pass that to dom4j to use when it encounters that url. The next best thing would be to just have dom4j use an alternate url that could point to a local file like file:///c:/foo/bar.xsd.

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• Using JSR 303 is it possible to generate validation.xml from annotations?

  - by HappyEngineer

  Let's say I have an annotation JSR 303 class like this: class A { @NotNull private String b; @Min(5) @Max(10) private int num = 3; @Pattern(regexp="[0-9]*") private String foo = "12345aa"; } How can I take that class and generate a validation.xml which contains the same constraints as those that are specified by the annotations?

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