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• OpenVPN on port 53

  - by TossUser

  I have an openvpn server setup on UDP port 53 on a public IP. All the connecting clients gets pushed external DNS servers such as 8.8.8.8 and opendns. Sometimes the resolution stops working on the connected vpn clients and I get strange packets in the openvpn log. Now my question is why is that? When a VPN client, let's say 192.168.1.22 does a DNS query that query should go to 8.8.8.8:53 and then an UDP response packet should be sent back to 192.168.1.22 on a high UDP port. Any ideas? Thanks

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• Dynamically changing one-node Cassandra cluster to two nodes

  - by Jason Axelson

  So I have an application that will be very dormant most of the time but will need high-bursting a few days out of the month. Since we are deploying on EC2 I would like to keep only one Cassandra server up most of the time and then on burst days I want to bring one more server up (with more RAM and CPU than the first) to help serve the load. What is the best way to do this? Should I take a different approach? Some notes about what I plan to do: Bring the node up and repair it immediately After the burst time is over decommission the powerful node Use the always-on server as the seed node My main question is how to get the nodes to share all the data since I want a replication factor of 2 (so both nodes have all the data) but that won't work while there is only one server. Should I bring up 2 extra servers instead of just one?

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• Slow Gmail attachment download over HTTPS

  - by Todd

  It only affects Gmail. I have tested other HTTP, FTP and HTTPS websites and downloading is fine, at the exact same time the problem is affecting a Gmail attachment download. The symptoms include both: High waiting time, before the download starts (on the order of 30 seconds); AND Very slow download transfer speeds (on the order of 1kbps) It's a very strange problem, and I didn't find any recent issues relating to Google Australia. The account works fine at another site with a different ISP, so it's either a computer configuration or ISP - I lean to the latter.

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• Is there a software like AutoCAD, but only 2D, not 3D?

  - by Saeed Neamati

  I love AutuCAD. It's powerful, easy to use, and fits engineering mind. It rocks when you want to draw 2D diagrams and shapes and one the cool features I like about it, is its snapping power. You draw a simple rectangle, then you can very easily create a circumscribe circle around it. However, new version of it are becoming really heavy (in size) and need high tech hardware, because of its powerful 3D capabilities, and rendering engines coming with it. I only want the 2D part of AutoCAD. Is there any software out there, which resembles AutoCAD (like having a console, where you can type L and get the line tool, or having snapping capability, etc.), but is small in size? In other words, what software can be named as AutoCAD 2D alternative?

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• VPS stops responding every now and again

  - by Or W

  I have a Linode vps that I use to host some of my websites on. It's Ubuntu based and it's up to date in terms of all packages. I don't have any cron jobs scheduled or any automatic processes. I host a few (up to date) wordpress blogs there that have very little traffic altogether. Every day (at a different time) my server stops responding, I can't SSH to it, web access is getting timed out and it just dies until I reboot it through the Linode manager. On the linode dashboard I can see that the CPU is not very high (2-3%) Incoming/Outgoing traffic is on 0 and the IO count has a spike just before the server stops responding (SWAP IO is at 2k and IO Rate is at 5k). When I reboot the server everything is just fine. I'm trying to figure out a way to analyze what's going on at these random times where the server freezes up. How can I determine the problem?

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• How to make my display Grayscale?

  - by Oldarney

  I want to reduce the saturation of my laptop monitor to the point that it is almost grayscale. That's the goal. Intel and Asus don't have an answer. Asus Splendid and the intel graphics control panel can increase the saturation, but not lower it. I would prefer a software solution, although I DIY'ed a vga grayscale adapter for my desktop. I have an Asus UL30A with an Intel GMA 4500MHD. I know that the latest ATI cards, windotosh's and high end nvidia cards all support control panel desaturation. Why? black and white makes me 3 times more productive.

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• mysql is not using multiple cpus

  - by mhost

  Our MySQL server has been using a lot of CPU lately (it's reached 100% several times and stays there for a while) and I noticed that it the CPU load is all on one core of one cpu. I was hoping to spread that out to all 4 on my server. I have been tweaking the MySQL settings to use more ram and less cpu, but it still occasionally reaches very high CPU usage. It seems like everything about the topic refers to thread_concurrency (which I've read is a solaris only setting). What can I do in Linux? Thanks.

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• config.nt not exist in windows server 2008 64bit

  - by user1853266

  i have a server with high traffic , it's about 20K request/sec at peak time and 5~10k request/sec at normal time but i have a serious problem i install nginx in windows server 2008 standard edition 64bit , but i get this error massage 2012/11/26 05:29:23 [error] 2496#2004: *3976 maximum number of descriptors supported by select() is 1024 while reading client request line, client: X.X.X.X, server: 0.0.0.0:8080 when i search , i found this problem is about dos application file handle limit , and i can be changed it on c:\windir\system32\Config.nt but config.nt not exist i also hear , in 64Bit os version , this file not exist so how can i change file handle in windows server 2008 - 64Bit ?

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• Any ramifications to disabling ClearPageFile

  - by user34710

  I am runing a Dell XPS 15z with a quad core I7, 8gb ram, 7200rpm hdd, windows 7 ultimate. My laptop was taking around 3 minutes to shut down, which seemed far too high to me. I did a bit of investigation, and it seemed that the ClearPageFile reg entry was set to 1, meaning that upon shutdown my pagefile.sys was being cleared before actually shutting the machine down. When I disable this setting, my laptop shuts down in about 20 seconds - clearly a big gain. My question is, are there any side effects of having this turned off (other than the security risk of the HDD being stolen, and still having any important info that was in the RAM up for grabs)?

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• Windows 7 unreasonable ram usage

  - by Deus Deceit

  I have a fresh install of windows 7, and my ram in normal startup goes up to 2.5 GB. I looked at task manager, and there's at least 1.5 GB missing from there and in resource monitor as well. No indication of what's using that ram. Can someone tell me how I can find out what's consuming my memory? I believe it's a virus but none of the free antivirus programs tracked it down. EDIT I added the pictures bellow. If this is normal usage of windows 7 as some answers imply... then I don't get this at all. P.S My windows 8 Installation was running bellow 2.5 gb actually it was 1. something, until recently that I transferred some files from another computer which had the same problem that mine has now. I deleted windows 8 and installed 7, since i would do that anyway. And now I'm getting high memory usage in windows 7 as well.

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• games and movies become too slow after some time

  - by ishaq

  On my gaming desktop, I was fixing my desktop's power supply when something seemed to burn (I got that stinging burning smell). However when I turned ON the computer (it was OFF before), everything seemed to be fine. However, I have noticed that now it becomes too slow if I play a game or movie on it. I am talking about the computer becoming painfully slow after about 5 minutes into the movie/game (it works fine otherwise e.g. browsing), it becomes so slow I can see individual frames from movies/games. What could be the problem? A fried video card? friend memory (RAM), something else? My system's configuration is: Intel Core i7 CPU 3.40GHz 8GB DDR3 RAM 2TB WDC HDD NVIDIA GeForece GT 220 (1GB) Thermal Take Commander MS1 Chassis ( http://www.thermaltakeusa.com/Product.aspx?S=1394&ID=2051 ) mainboard: Intel DH67CL AAG10212-208 Realtek High Definition Audio

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• Is there other usage of Comcast extension cable and splitter?

  - by Tim

  I have an unused Comcast high-speed internet self-install kit from 2006. It has two coils of extension cable, and a splitter, and some screws. The name of the cable is "extension cable" printed on the package. I wonder if that is its actual name? As ethernet cables are always useful, I wonder if the extension cables are totally worthless and should be tossed into a trash can? Or are they usable for some other purposes, or even sellable? Thanks! SVI Digital SV-2G Splitter (5/1000MHz): One interface of the cables: Screws

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• Advice for an EC2 Architecture and Deployment Strategy

  - by Mark

  My company is currently migrating several websites and PHP web applications (standard LAMP stack) from three in-house servers to Amazon EC2. Because we had only three servers, we clustered several low-traffic websites with perhaps one high-traffic web application, and served them from the same server. The server admin has pretty much copied the previous architecture wholesale onto the EC2 instances, simply upping the instance size to account for the highest traffic client that occupies that particular instance. This architecture might be okay if it wasn't for deployment. Any time one of these sites/apps changes, it means redeploying the entire instance, along with the 30 sites/apps it hosts, instead of just updating one. How can we architect our cloud in a more modular fashion? Should each app get its own appropriately-sized instance? What is the best strategy for deployment in this type of situation?

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• Home router for higher network loads

  - by Zizzencs

  I'm trying to find a replacement for my ASUS WL500GP router. Some constraints: my ISP now provides 120 Mbit bandwidth - the router must be able to handle it I have 3 computers and a laptop at home - the router must have at least 4 LAN ports and the WAN port I need to be able to do the following in parallel: use bittorrent with ~1000 connections transfer files from one home computer to another at high speed access one home computer from my workplace I don't really need wireless I don't really want two boxes to serve all these purposes. So I was searching for a router with 1 Gbit ports, jumbo frame support and good reviews, but haven't really found a promising candidate so far. Any suggestions?

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• mysql is not using multiple cpus

  - by helpmhost

  Hi, Our MySQL server has been using a lot of CPU lately (it's reached 100% several times and stays there for a while) and I noticed that it the CPU load is all on one core of one cpu. I was hoping to spread that out to all 4 on my server. I have been tweaking the MySQL settings to use more ram and less cpu, but it still occasionally reaches very high CPU usage. It seems like everything about the topic refers to thread_concurrency (which I've read is a solaris only setting). What can I do in Linux? Thanks.

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• How many nginx/fastcgi processes do you use?

  - by qliq

  I have a drupal-based website on a VPS with 1GB RAM and 1Ghz processor share. The webserver is nginx along with php-fastcgi. Currently I am using 10 nginx and 13 php-fastcgi processes. The server load is high most of the times while half of the RAM is unused. The CPU usage rarely reaches 80%. I have tried some other combinations of nginx/php-fastcgi but am not sure what is the optimal combination because I am quite ignorant about what's going on below the surface. So I appreciate if you could share your experience or give me some clues.

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• Specific apache + mysql settings for a light-weight site

  - by Good Person

  I have a small website with a Joomla and a Moodle set up. It seems that both of these are very slow. The server (CentOS release 5.5 (Final)) is a virtual dedicated server with about 2GB of ram. I don't expect to ever get more than 10-15 people on at the same time (and if that is high) What settings could I change in either apache, mysql, or even the OS to increase the performance of my site? I'm not concerned about running out of resources if I get too many visitors. If you need more specific data leave a comment and I'll edit the question.

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• openVAS - Microsoft RDP Server Private Key Information Disclosure Vulnerability - false Alarm?

  - by huebkov

  I performed a openVAS scan on a Windows Server 2008 R2 and got a report for a high threat level vulnerability called Microsoft RDP Server Private Key Information Disclosure Vulnerability. An remote attacker could perform a man-in-the-middle attack to gain access to a RDP session. Affected Software is Microsoft RDP 5.2 and below. My server uses RDP 7.1, is this alarm a false alarm? Security Advisor Pages say: Solution Status Unpatched, No remedy... References http://secunia.com/advisories/15605/ http://xforce.iss.net/xforce/xfdb/21954/ http://www.oxid.it/downloads/rdp-gbu.pdf CVE: CVE-2005-1794 BID:13818

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• Hardware recommendations for building an Ubuntu encrypted file server

  - by Robert Mashlan

  I would like to build a file server for my home network using Ubuntu. It will serve files from RAID1 configured disks, either in the OS or in hardware. It will be connected to a Gigabit ethernet LAN. The disks will use an encrypted file system. It will serve samba shares. I would like a recommendation on what kind of processing power/memory I would need to build a box that would be able to sustain the full capacity of the Gigabit ethernet connection in a file transfer for a single connection with the overhead of serving from an encrypted disk. I'm not looking to build a dream server, I just want enough processing capacity for high performance (and reliable) file sharing and spend as little as possible for it. This may be tangential, but what kind of hardware would I need to have a server be able to reliably go into a low power mode when no requests are being made of it?

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• Amazon EC2 as load balanced/failover solution

  - by sugiggs

  Hi All, I'm thinking of an idea but not sure the pros/cons of it. At the moment, we are hosting our website on a dedicated server. As a failover/load balanced solution, I'm thinking to use Amazon EC2+EBS. The files can be rsync and mysql can be setup as master-master replication When the load is high, I can up the machine, given sometime to "sync" and load balanced the traffic there. is it do-able? any link I can read more on this?

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• If a SQL Server Replication Distributor and Subscriber are on the same server, should a PUSH or PULL subsciption be used?

  - by userx

  Thanks in advance for any help. I'm setting up a new Microsoft SQL Server replication and I have the Distributor and Subscriber running on the same server. The Publisher is on a remote server (as it is a production database and MS recommends that for high volumes, the Distributor should be remote). I don't know much about the inner workings of PUSH vs PULL subscriptions, but my gut tells me that a PUSH subscription would be less resource intensive because (1) the Distributor is already remote, so this shouldn't negatively effect the Publisher and (2) pushing the transactions from the Distributor to the Subscriber is more efficient than the Subscriber polling the Distribution database. Does any one have any resources or insight into PUSH vs PULL which would recommend one over the other? Is there really going to be that big of a difference in performance / reliability / security?

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• MySQL keeps crashing due to bug

  - by mike

  So about a week ago, I finally figured out what was causing my server to continually crash. After reviewing my mysqld.log I keep seeing this same error, 101210 5:04:32 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295 Here is a link to the bug report, http://bugs.mysql.com/bug.php?id=35346 someone recommend that you set the max_join_size vaule in my.cnf to 4M, and I did. I assumed this fixed the issue, and it was working for about a week with no issues until today... I checked MySQL and the same error is now back, 101216 06:35:25 mysqld restarted 101216 6:38:15 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295 101216 6:38:15 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295 101216 06:40:42 mysqld ended Anyone know how I can really fix this issue? I can't keep having mysql crash like this. EDIT: I forgot to mention every time this happens I get an email from linode staying I have a high disk io rate Your Linode, has exceeded the notification threshold (1000) for disk io rate by averaging 2483.68 for the last 2 hours.

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• Auto restart server if virtual memory is too low

  - by Sukhjinder Singh

  There are quite number of software running on my server: httpd, varnish, mysql, memcache, java.. Each of them is using a part of the virtual memory and varnish was configured to be allocated 3GB of memory to run. Due to high traffic load which is 100K, our server ran out of memory and oom-killer is invoked. We've to reboot the server. We have 8GB of Virtual Memory and due to some reason we cannot extend to larger memory. My question is - Is there any automated script, which will monitor how much virtual memory left and based upon certain criteria, lets say if 500MB left than restart the server automatically? I do know this is not the proper solution but we have to do it, otherwise we don't know when server will get OOM and by the time we know and restart the server, we lost our visiting users.

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• How to disable screens turn off Windows 8.1

  - by Warpzit

  So recently my computer started turning my screen monitors off after a while without activity, if I move the mouse or hit the keyboard they turn back on. I just want them to stay on. My System is windows 8.1 64 bit, I have 2 screens with mini display port and 1 television with hdmi which often is in regular television mode when this issue happens. Now before you jump to conclusions this is what I've tryed: Disabled screen saver Power saving settings to high with following set: Turn of the display: Never Put the computer to sleep: Never Turn off hard disk after: Settings: Never Sleep: Sleep after: Settings: Never Display: Turn off display after: Settings: Never Display: Enable adaptive brightness: Settings: Off Multimedia settings: When sharing media: Settings: Prevent idling to sleep. Any pointers that get me in the right direction will be greatly appreciated.

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• Does "I securely erased my drive" really work with Truecrypt partitions?

  - by TheLQ

  When you look at Truecrypt's Plausible Deniability page it says that one of the reasons for partition with solely random data is that you securely erased your drive. But what about the partition table with full disk encryption? How can you explain why the partition table says there's a partition of unknown type (With my limited knowledge of partition tables I think that they store all the partition filesystem types) and with solely random data? It seems that if your going to securely erase the drive you would destroy everything, including the partition table. And even if you just wiped the partition, the partition table would still say that the partition was originally NTFS, which it isn't anymore. Does the "I securely erased my drive" excuse still work here? (Note: I know that there's hidden truecrypt volumes, but I'm avoiding them due to the high risk of data loss)

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