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• Default maximum heap size -- Ubuntu 10.04 LTS, openjdk6-jre

  - by sachin

  I just installed openjdk6-jre on Ubuntu 10.04 java version "1.6.0_20" OpenJDK Runtime Environment (IcedTea6 1.9.2) (6b20-1.9.2-0ubuntu1~10.04.1) OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) Every time I run "java" I get this error: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. This can be solved by specifying a maximum heap size and running "java -Xmx256m" But is there anyway to permanently fix this error (i.e. set the default heap size to 256MB so that I do not need to specify the max heap size every time I run the command)

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• Linux foxboard network monitor

  - by het.oosten

  I want to use a Foxboard a simple network monitor for multiple routers (all routers are connected to the internet). Foxboard is a mini pc with an embedded version of Debian. My idea is to use multiple virtual network devices like this: eth0 192.168.2.10 eth0:1 192.168.3.10 eth0:2 192.168.4.10 I found a nice Python script to ping an external host here (the solution from Ryan Cox): http://stackoverflow.com/questions/316866/ping-a-site-in-python Is it possible to configure Debian to use eth0 when I ping www.site-a.com and eth0:1 when I ping www.site-b.com?

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• IIS slow response

  - by Martin Ševic

  I have developed ASP.NET 4.5 application which take infos about sensors from sqlite database every 3 seconds. This application runs nice on my local develop machine on IIS Express server. I have created virtual machine (4x 3,25 GHz CPU; 6GB RAM) where i have installed Windows Server 2012 and IIS 8 service in order to test application on real server because we will run it on production machine later. After installing VC++ 2010 x64 and VC++ 2010 x86 and set "Enable 32-bit application" to true in application pool website started to work but there is a large problem with response time. There is a for example 10 seconds delay before page loads. CPU utillization is about 10% and RAM about 1,5GB. I am new to configuring IIS server so i want to ask if there is some tip how to make it faster. I am sure, there will be some twist which will make it normal work. Many thanks.

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• Broadcasted networks appear cached with netsh? [on hold]

  - by Joe

  We have a company mandate to hide certain windows functions. I'm working on a company application which will allow my users to configure WiFi networks. The app is scanning broadcasted networks using: "netsh wlan show networks" it will return networks that have been turned off. For example: I will run the command and then unplug my wireless router with the SSID "Netgear". For several minutes after turning off the network, the show networks command will continue to return "Netgear". Does anyone know where this gets cached, how to clear it out, or how to force a fresh scan of "netsh wlan show networks"? Thanks all, J

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• Virtualbox, slow upload speed using nat

  - by user1622094

  Im running Virtualbox on a Ubuntu 12.04 server (host) and I'm running a Windows 7 as guest os. Im using the (virtual) Intel PRO/1000 MT network card. I get good network performance for download using both nat and bridged network settings but upload speed is really slow using nat. I have tied this on tow different servers, one brand new, and one a several years old, both gave the same result. If you can explain this behavior or have ideas of further test I can perform please let me know.

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• Is a computer's DRAM size not as important once we get a Solid State Drive?

  - by Jian Lin

  I am thinking of getting a Dell X11 netbook, and it can go up to 8GB of DRAM, together with a 256GB Solid State Drive. So in that case, it can handle quite a bit of Virtual PC running Linux, and Win XP, etc. But is the 8GB of RAM not so important any more? Won't 2GB or 4GB be quite good if a Solid State Drive is used? I think the most worrying thing is that the memory is not enough and the less often used data is swapped to the pagefile on hard disk and it will become really slow, but with an SSD drive, the problem is a lot less of a concern? Is there a comparison as to, if DRAM speed is n, then SSD drive speed is how many n and hard disk speed is how many n just as a ball park comparison?

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• Pages partially load on rapid refresh

  - by user101570

  I recently set up a VPS slice with 256MB to run a LAMP stack (Ubuntu 11.04, Apache2, Mysql, PHP5). So far I'm only running a simple Wordpress site on an IP-based virtual host I set up. The performance is excellent, but I've noticed that if I send multiple HTTP requests from the same IP in a short time period, only partial pages are rendered. Then if I wait a bit and refresh the page, the entire page loads again. I noticed this behaviour when accessing the site from two browsers from my office desktop, but it also presents itself if I quickly navigate the site from a single browser (any browser). I'm guessing this is an Apache phenomenon, as the pages are rendered correctly except under the conditions above, but perhaps I'm wrong here. Could it be my hosting company with some kind of DOS protection in place? As a relative Linux/server noob, I'd really appreciate any insight into what settings in Apache could explain this behaviour, and how I might go about changing it.

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• Starting VMs with an executable with as low overhead as possible

  - by Robert Koritnik

  Is there a solution to create a virtual machine and start it by having an executable file, that will start the machine? If possible to start as quickly as possible. Strange situation? Not at all. Read on... Real life scenario Since we can't have domain controller on a non-server OS it would be nice to have domain controller in an as thin as possible machine (possibly Samba or similar because we'd like to make it startup as quickly as possible - in a matter of a few seconds) packed in a single executable. We could then configure our non-server OS to run the executable when it starts and before user logs in. This would make it possible to login into a domain.

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• Windows 7 - XP Mode - Apache

  - by Howard

  I've setup Virtual PC and XP Mode on my Windows 7 Pro. Using Apache 2.0.52 I have no problems having my website up and running on the Windows 7 machine. But Under VPC/XP Mode the best I can do is Localhost mode. What do I need to do to enable http connections? I need the XP Mode as besides the website I also run a Web BBS and a Dos based (via telnet) BBS. Some of the apps in the Dos BBS just won't work under 64 bit, no matter what setting (capability) are used. Thanks in advance...

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• Proxy service likes Apache Http

  - by Aptos

  Currently I try to simulate my app as distributed servers, so I let them run on localhost:9000 and localhost:9001, i tried using apache load balancer but it is really hard to config on mac, my idea is the second server localhost:9001 will be kept ideal and the requests only be redirected to them when the first server is downed. Is there any good free program can do that ? (except Apache httpd). Extra functions: my application is written in java and maintain an in-memory object, is there any service that can synchronize that object between 2 servers so they can keep uptodate status of other (the second one takes state of the first one)? Is there any app can support that? Thank you very much.

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• Install ubuntu on MacBook Pro

  - by n179911

  Hi, Can you please tell me what is the preferred way to install Ubuntu on MacBook Pro? I have a MacBook Pro with MacOSX 10.5. I need a Linux environment some times. So what is the best way to achieve that? 1. Make it dual boot? (but I don't know if that is possible with MacBook) 2. Install Virtual Box and then put Ununtu on top of it? (But I am not sure if this configuration will be slow, so I need a Linux environment for coding, so it needs to do compiling and debugging and stuff). Thank you for any tips.

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• Overheating on Ubuntu 12.04

  - by mati

  I have a Dell Inspiron Q17R with two graphic cards and I noticed that it is overheating. I installed Bumblebee, Jupiter and Flashblock, and I followed this guide as well, but it still got up to 74C. Is there anything more I can do? It still doesn't really seem to be working well and the fan keeps spinning really fast. After performing the following test: sensors in the terminal, this is what I got: Adapter: Virtual device temp1: +75.0°C (crit = +100.0°C) temp2: +75.0°C (crit = +100.0°C) coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +68.0°C (high = +86.0°C, crit = +100.0°C) Core 0: +68.0°C (high = +86.0°C, crit = +100.0°C) Core 1: +65.0°C (high = +86.0°C, crit = +100.0°C) it doesn't look good.

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• MSSQL, ASP.NET, IIS. SQL Server perfmon log question

  - by Datapimp23

  Hi, I'm testing a web application that runs on a hypervisor. The database server and the webserver are seperate vm's that run on the same hypervisor. We did some tests and the functions perform ok. I want you guys to look at a screenshot of a permon log of the sql 2005 server on the busiest moment. The webserver perfmon log looks fine and it's obvious that we have enough resources to present the page in a timely fashion. http://d.imagehost.org/view/0919/heavyload http://d.imagehost.org/0253/heavyloadz.jpg Zoomed out The striped blue line maxing out is the Processor que length (scale 100,0) The green line at around value 30 is Available MBytes (scale 0,01) The rest of the counters are visible on the screenshot. The sql server machine has no CPU limitations on the hypervisor resources and has 5 vcpu's and 5 GB RAM. Can someone help me to interpret this log. Thanks

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• Strange PHP output buffering

  - by radek-k

  PHP: header('Content-type: text/plain'); for ($i=0; $i<10; $i++){ echo "$i\r\n"; ob_flush(); flush(); sleep(1); } I tried script above on 2 different servers. Both respond numbers 0...9 in every line. In case of first server each number is received every second. In case of second server there is no output for 10 seconds and entire output is displayed at once. What might be wrong int second case? I tried various uutput control Functions but it didn't help. Set of response headers in both cases is pretty much the same: HTTP/1.1 200 OK Date: Mon, 03 Jan 2011 19:21:21 GMT Server: Apache X-Powered-By: PHP/5.2.14 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/plain

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• Is WinRT really as secure as it's made out to be?

  - by IDWMaster

  Prior to releasing Windows 8, Microsoft claimed that all WinRT apps are cleanly removed from your computer after uninstalling them, and that WinRT apps should not interfere with other running applications, because they are ran in a "sandboxed" environment. Microsoft has also claimed numerous times on Channel9 that Windows 8 apps are not ran in a VM. So my question is; are these claims accurate? If the application is not running inside of a VM, how is it possible to protect the system against malicious code at runtime, assuming the attacker was able to bypass the screening process of the Windows Store system? Microsoft allows "native code" in WinRT apps, so wouldn't it be possible (using hand-coded assembly or some odd pointer manipulation trick to call functions outside of the sandboxed environment and interfere with the rest of the system, if it's really "native code" and not some VM?

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• VM: Windows 7 host, Linux guest, VT-d?

  - by chx

  I am sick of the driver issues of Linux. So I am planning to switch to Windows 7 as a host and virtualize my Linux into it. My laptop has integrated Intel graphics and supports VT-d. For speed reasons I would like to assign that card to Linux. Now, Parallels could do it but this page says Note: If you have only one PCIe video adapter, its name will be grayed out in the PCI Devices list and you will not be able to allocate it to your virtual machines. I would be perfectly fine with a headless Windows 7 (I can remotely admin from other computers or just the Linux guest) -- is there any VM software that doesn't have this restriction?

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• Set up Ubuntu in Virtualbox to have static ip

  - by Don H

  I frequently work in different locations, and need to have a virtualbox version of Ubuntu server running locally. While I was at home getting it set up, I was able to ssh into the server using the locally allocated IP address. However, now that I'm elsewhere, ifconfig is still showing the old 10.0.x.x ip address, but instead of being in the 10.0.x.x space, my laptop's ip starts with 192.168.x.x With that in mind, if there a straightforward way to set up the virtual box Ubuntu server in such a way that I can just connect using "ssh servername" regardless of it's ip address?

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• WebsitePanel 2 totally NOT working on Windows Server 2012 on Azure

  - by Carmine Giangregorio

  I’m having many troubles installing WebSitePanel on an Azure Virtual Machine, with Windows Server 2012. I followed the steps in http://www.websitepanel.net/documentation/deployment-guide/server-configuration/preparing-windows-server-2008-r2-for-websitepanel-installation/ and installed everything I needed. Then, I installed the WebSitePanel Standalone Server package with the installer. I opened the endpoint for the port 9002 on Windows Azure; so I pointed my browser to myhostname.cloudapp.net (note: in Azure you don’t have a static IP address, instead you have an hostname like [hostname].cloudapp.net). So, loading myhostname.cloudapp.net:9002 fails, and any browser shows something like “Unable to load page”. Notice: if I try to load the WebSitePanel Portal directly on the server, I get an error HTTP 400 Bad Request. How come? IIS works perfectly on the server, in fact the default website runs without problems on port 80.

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• ErrorDocument 404 not found in non-existent subdomain

  - by Question Overflow

  I am trying to get the apache server to issue a custom 404 error for invalid subdomains. The following is the relevant part of the httpd configuration: Alias /err/ "/var/www/error/" ErrorDocument 404 /err/HTTP_NOT_FOUND.html.var <VirtualHost *:80> # the default virtual host ServerName site_not_found Redirect 404 / </VirtualHost> <VirtualHost *:80> ServerName example.com ServerAlias ??.example.com </VirtualHost> What I get instead is this: Not Found The requested URL / was not found on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. I don't understand why a URL to non-existent-subdomain.example.com produces a 404 error without custom error as shown above while a URL to eg.example.com/non-existent-file produces the full custom 404 error. Can someone advise on this. Thanks.

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• Does nginx auth_basic work over HTTPS?

  - by monde_

  I've been trying to setup a password protected directory in a SSL website as follows: /etc/nginx/sites-available/default server { listen 443: ssl on; ssl_certificate /usr/certs/server.crt; ssl_certificate_key /usr/certs/server.key; server_name server1.example.com; root /var/www/example.com/htdocs/; index index.html; location /secure/ { auth_basic "Restricted"; auth_basic_user_file /var/www/example.com/.htpasswd; } } The problem is when I try to access the URL https://server1.example.com/secure/, I get a "404: Not Found" error page. My error.log shows the following error: 011/11/26 03:09:06 [error] 10913#0: *1 no user/password was provided for basic authentication, client: 192.168.0.24, server: server1.example.com, request: "GET /secure/ HTTP/1.1", host: "server1.example.com" However, I was able to setup password protected directories for a normal HTTP virtual host without any problems. Is it a problem with the config or something else?

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• Are Rackspace's Cloud Servers really cloud hosting?

  - by sopppas

  I may be confused about what cloud hosting really is... I asked Rackspace how its Cloud Server (CS) 256MB/10GB compares to Slicehost's 256slice VPS, and they said it's exactly the same (only different billing and BW). I know they are the same company. So, why do they call it Cloud Server? Isn't it just a collection of VPS (virtual private servers)? For me, cloud hosting would be: if I need any additional horsepower at any given time, the cloud would automatically stack more VPS and then charge me at the end of the month for the surplus of resources. Reading Rackspace's info, it looks like it's for me to decide when to stack more CS and that its Cloud Servers don't AUTOMATICLY scale up. Am I confusing things?

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• Cannot install VS Team System 2008 on Windows 7 Ultimate (64bit)

  - by systemX

  I am trying to install VS TS 2008 on W7 Ultimate (64bit), but I have run into errors during the setup. Please take note that I have tried to mount the iso to a virtual drive, and also extracted the iso contents to a local folder. Both methods have failed and produce the same error log below. [10/26/09,03:02:40] Runtime Pre-requisites: [2] Error: Installation failed for component Runtime Pre-requisites. MSI returned error code 1603 [10/26/09,03:02:42] VS70pgui: [2] DepCheck indicates Runtime Pre-requisites is not installed. [10/26/09,03:02:42] VS70pgui: [2] DepCheck indicates Microsoft Visual Studio 2008 64bit Prerequisites (x64) was not attempted to be installed. And the list goes on and on.. This is a fresh install of W7, and I have not installed Microsoft Office 2007 at all yet, not sure if it would be causing my errors right now.. I appreciate any help I can get thank you.

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• SSH disconnects active session after 20 minutes

  - by Paramaeleon

  I’ve just set up a new Linux box (OpenSuSE 12.3 on VmWare). Now I stated that my SSH shell sessions are disconnected exactly after 20 minutes, clearly with activity. (Putty: “Network error: Software caused connection abort”) I already set Putty to send keep alives every 64 sec. In sshd_config, I set ClientAliveInterval 50 ClientAliveCountMax 2 and did a deamon reload. Didn’t help. About two minutes after the link breakdown, ssh reports to /var/log/messages: … … sshd[…]: Timeout, client not responding. … … sshd[…]: pam_unix(sshd:session): session closed for user root I don’t encounter this behaviour when connecting to other virtual machines, so I guess the problem isn’t in the network. Any help is appreciated.

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• How do I now access my site for an installation

  - by user4524

  I have just rented a virtual private server with DirectAdmin. I have an ip address, lets say its: 178.239.60.18 Now I have made a new domain on the server. It resides in a folder called: example. Now when I would like to acces this in a browser, I type in 178.239.60.18/example or 178.239.60.18:example But this does not work. What am I doing wrong? When I look at the DNS record it does say the the ip address for example is 178.239.60.18

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• How to setup a simple Ubuntu Server Tomcat cluster on VirtualBox for testing?

  - by Alex Pakka

  I am looking for a step by step instructions to setup at leat two (and later more) simple Ubuntu Virtual Core 12.10 Server VMs on Oracle VirtualBox under Windows 7 64bit. The test setup would be: Apache HTTP server on the Windows host acting as a Load Balancer. The result will be that going to http://localhost:8080 would balance between two nodes and prove session replication. Two lean, small footprint Ubuntu Server guest nodes with Java 7 and Tomcat 7. The intention is to help everyone doing High Availability / Load Balancing development and testing to create a reasonable environment on the local workstation or mainstream notebook in as little time as possible.

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