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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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• 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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• 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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• Graphing per-user CPU usage on a Linux machine

  - by mart1n

  I want to graph (graphical output would be great, i.e. a .png file) the following situation: I have users A, B, and C. I limit their resources so that when all users run a CPU intensive task at the same time, those processes will use 25%, 25%, and 50% of CPU. I know I can get the real-time stats using top but have no idea what to do with them. I've searched through the huge top man page but haven't found much on the subject of outputting data that can be graphed. Ideally, the graph would show a span of maybe 30 seconds. Any ideas how to achieve this?

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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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• Should we regularly schedule mysqlcheck (or databsae optimization)

  - by scatteredbomb

  We run a forum with some 2 million posts and I've noticed that if left untouched the overhead in the mySQL (as listed in phpMyAdmin) can get quite large (hundreds of megabytes). I'm wondering if scheduling a normal mysqlcheck to optimize the tables is good practice? Any reason not to do it, say, once a week at an off-peak hour? There was a time over the summer where our site was constantly crashing because mysql was using up all resources. That's when I noticed the huge amount of overhead and optimized the database and haven't had any problems since then with stability. I figured if that was helping alleviate the issues, I should just setup a cron to automatically do this.

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• New Servers Active Directory and Exchange

  - by user3164638

  I have 3 Dell PowerEdge server, each with 2 quad-core processors. I am going to bring this office out of the stone-age network (P2P, share files on a flash drive, emails through Google, etc) and set up Active Directory and Exchange 2013. Our needs are not that great at the moment - our staff consists of approximately 40 people, and our network may eventually be managed by an external company. We need only one domain for our emails (though we may serve emails for a few other partners domains as well). I was thinking of setting something up like this: Server 1: Primary DC. Active Directory and Exchange on separate virtual machines. Server 2: Redundant of server 1. Server 3: Shared resources, storage, backups, etc. How would you utilize 3 servers for an Active Directory / Exchange setup for a small/medium office? We do have plans to grow, so my solution must be scalable, though I'm not sure that I want to split permissions, though I'd consider it if that was something that could be changed on down the road.

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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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• 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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• Disable address bar in Internet Explorer 9

  - by token

  I'm trying to disable the address bar in IE9. I've done a significant amount of searching on this and just can't seem to find a way to make it happen. A lot of web resources discuss how to do it in IE8, but not IE9. The reason you might ask? I have an application being hosted in a remote desktop farm that links to web pages outside of the application into Internet Explorer. I need to ensure users are limited to just going to the pages the program pushes them to. I realize I could use a proxy server to limit where they can go, but I'm trying to find a really simple way to just disable the address bar instead. I can't use Kiosk mode because it puts the browser into full screen mode. This won't work for my situation as I need to give users what appears to be a regular browsing experience without an address bar.

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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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• Apache on Windows in production environment? Why not?

  - by tillda

  "Everyone" know that Apache is for Linux/Unix and on Windows IIS is the way to go. However, I'm not a pro at Linux and it would be an enormous relief for me to use just the same setup in the production environment that I use during development. I'm a solo developer and I'm trying to make things as simple as possible. I've already got rid of other issues like storage (-cloud) emails (-postmark). So, what are the real drawbacks that can happen when I just put Apache in Windows virtual private server from Rackspace and use it as the main production environment for a PHP project? Money for more VPS resources is not that big issue compared to the possibility of not having to learn a different OS. Super-heavy traffic is not expected. Also my PHP project can be quite optimized. There are some heavy scripts, but only for the inside (logged) users. All else can be served more or less statically.

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• Is virtual machine slower than the underlying physical machine?

  - by Michal Illich

  This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)? Did anyone measure performance difference of web server or db server (virtual VS physical)? If it depends on configuration, let's imagine two quad core processors, 12 GB of memory and a bunch of SSD disks, running 64-bit ubuntu enterprise server. On top of that, just 1 virtual machine allowed to use all resources available.

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• User cannot book a room resource

  - by bakesale

  Im having a problem with a specific user not being able to book a room resource. No error message is generated at all. The user attempts to add the room as a meeting resource and it simply doesnt register with the resources calendar. I have tested the resource with other accounts and other rooms for this user but it is only this room that is having issues for this user. This Exchange server was migrated from 2007 to 2010. All rooms except for the problem room were created back on Exchange 2007. This new room was created with Exchange 2010. Maybe this clue has something to do with the problem? This is a paste of the mailboxes folder permissions [PS] C:\Windows\system32Get-MailboxFolderPermission -identity cbr125:\calendar RunspaceId : 448ab44a-4c2a-4403-b46c-fce1106c0823 FolderName : Calendar User : Default AccessRights : {Author} Identity : Default IsValid : True RunspaceId : 448ab44a-4c2a-4403-b46c-fce1106c0823 FolderName : Calendar User : Anonymous AccessRights : {None} Identity : Anonymous IsValid : True

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• Chromium never stops loading iGoogle

  - by regulatethis

  I almost always keep a tab open on google.com/ig. Recently I've noticed that the "loading" animation for that tab never stops spinning, even though the page appears to be fully loaded. Even though there's no direct problem with this, I find the animation really distracting and to be honest it's driving me crazy. I've done a few things to try to figure this out. I've removed every single one of my gadgets (so my igoogle is blank), but that made no difference. I've disabled adblock and scriptno. nothing. I've watched the network console in developer tools to look for resources that haven't finished loading, but it looks like everything is done. I'm all out of ideas. For my sanity's sake, please help.

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• Trying to figure Windows 2008 Server and Active Directory - complete novice!

  - by Simon E

  I am a novice in networking and I want to learn more about Windows Server 2008 and Active Directory. Basically I have serveral Windows 7 PC's in my home and an IBM server with Win Server 2008 installed. I have enabled Active Directory and set the server to have a static IP. Thats as far as I have got and I feel a little overwhelmed at the moment as I am not sure what to do next. What I eventually want to do is have the Windows 7 PC's to be able to be authenticated by the server - basically a mock up of what most large or medium sized businesses/organisations run. Sorry if I sound a bit sketchy, but I understand some things but not the whole picture, I guess I just need confirmation that I am sort of on the right track :) Also what are some good resources out there you can point me to, what are the absolute basics I need to to get started so I can further my learning?

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• Windows 7 Built-In VPN - How to access network shares, printers, etc.?

  - by mbrion

  After I have successfully connected to a Windows 7 box via the built-in VPN: how do I access shares, shared printers, network appliances, etc.? So, call me bad at googling, but: I can find dozens of articles on "How to Set up a VPN Connection" and "How to connect to a VPN" for Windows 7... but I can't find a single article on how to access resources after connecting. I have a home VPN set up in Windows 7; I was able to connect to it from my friend's Windows 7 machine last night. I expected to be able to UNC into my shares; I also expected to be able to go to "Start Computer" and Click "Network" on the left side, and then see all of the devices on my home network (while the VPN was connected). Am I missing something obvious? How do I make this happen?

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• Windows 7 Built-In VPN - How to access network shares, printers, etc.?

  - by Mike Brion

  After I have successfully connected to a Windows 7 box via the built-in VPN: how do I access shares, shared printers, network appliances, etc.? So, call me bad at googling, but: I can find dozens of articles on "How to Set up a VPN Connection" and "How to connect to a VPN" for Windows 7... but I can't find a single article on how to access resources after connecting. I have a home VPN set up in Windows 7; I was able to connect to it from my friend's Windows 7 machine last night. I expected to be able to UNC into my shares; I also expected to be able to go to "Start Computer" and Click "Network" on the left side, and then see all of the devices on my home network (while the VPN was connected). Am I missing something obvious? How do I make this happen?

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• Hosing website on own server. What is Hardware requirement and Cost [closed]

  - by KuKu

  As i am about to finish my dream website, i need to host it on some server. I checked Amazon AWS Free Tier, i found it pretty complex. As i made full website in java(JSP + Servlet + mysql + Node.js), its been expensive to host. So i thought that why not to host on own server so that i will be fully dependent on my resources, not on any one else. And i know, in future i need to pay more and more to the other hosting company(because of uploading images and number of incoming users). So my question is, On initial stage what kind of hardware i will required. What can be the cost of that hardware? I already have 12MBPS broadband connection, will it be sufficient? It has static IP Address as well.

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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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• NAS device for distributed team

  - by user5959

  We are a distributed team spread across 5 locations. We have a shared drive (1 TB data) at our former location that we are currently accessing via Hamachi VPN. Our shared drive is a network folder on a Windows Server located at one of our locations. The current connection speed is terrible. The upload speed at the current location of the shared drive is very slow. We looking for a NAS device that we can host at another location with better upload speed that all of us can access. I am looking for a NAS device that has these features: Minimal Maintenance as we do not have dedicated IT resources Access data on the device from multiple locations. Ability to create network drive (On Windows Computers Map Network Drive) Upload data from random client computers without having to install software. (Right now, we use LogMeIn Rescue's file manager) Ability handle slow or dropped connections when transferring files (Maximum size 1.5 GB)

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