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• What to do for a 1 million concurrent web application? [duplicate]

  - by Amit Singh

  This question already has an answer here: How do you do load testing and capacity planning for web sites? 3 answers There are few things that I would like to know here. What server configuration do I need. And if I am deploying it on EC2 how many VMs do I need and what should be their configuration. What options do I have to do a load testing for 1 million concurrent users. Any pointer to (for php) how to code or what to keep in mind for such application. This is for sure that I don't exactly know what to ask because this is my first application on this scale. But one thing is clear that this application should pass a load test of 1 million concurrent request.

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• What kind of server do I need to handle 10 million requests and mySQL queries a day?

  - by Calvin

  I'm a new bie of server administration and I'm looking for a powerful hosting service to host my new website. This website is basically a back-end of an mobile online game, and it will: handle up to 10 million of HTTPS request and mySQL queries a day store up to 2000 GB file on the hard disk transfer probably 5000 GB data in and out per month it runs on PHP and mySQL have 10 million records in mySQL database, for each record there are 5-10 fields, around 100 bytes each I really don't know what kind of a server I need to handle these requirements, my question is: what cpu/ram do I need for a dedicated server or vps? what hosting companies are able to offer this kind of dedicated server or VPS? what about cloud computing? I've researched Amazon EC2 but it seems complicated to me. And I've contacted Rackspace but strangely they said Cloudsites is not suitable for my requirements. I wonder if there is other cloud hosting company. any other alternative method? thanks very much!

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• Where do I learn about IP blocks and subnets? Or is there just a calculator that does it all for me?

  - by cwd

  Amazon's elastic compute tool (among others) requires the ip block format for their command: ec2-authorize websrv -P tcp -p 80 -s 205.192.0.0/16 I may be doing this wrong, but as far as I can tell I need to use the block format even for a single IP address. 1) So, how would I do that for this IP? 71.75.232.132 Several years ago I took a CCNA class, and I remember going over IPs and subnets, masks, broadcast addresses, class a/b/c networks, etc. However a lot seems to have changed since then - for example I don't think you can tell what "class" a network is in just by looking at it anymore - sometimes they could be multiple classes. 2) Anyhow, my second question is where do I go to get a refresher on all these things? 3) Or should I just be using ipcalc or an online calculator to do it all for me - and if so, which one?

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• How does java permgen relate to code size

  - by brad

  I've been reading a lot about java memory management, garbage collecting et al and I'm trying to find the best settings for my limited memory (1.7g on a small ec2 instance) I'm wondering if there is a direct correlation between my code size and the permgen setting. According to sun: The permanent generation is special because it holds data needed by the virtual machine to describe objects that do not have an equivalence at the Java language level. For example objects describing classes and methods are stored in the permanent generation. To me this means that it's literally storing my class def'ns etc... Does this mean there is a direct correlation between my compiled code size and the permgen I should be setting? My whole app is about 40mb and i noticed we're using 256mb permgen. I'm thinking maybe we're using memory that could be better allocated to dynamic code like object instances etc...

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• Server 2012 GPO: PowerShell Script on Computer Startup not running

  - by Alex

  I've got a couple of Server 2012 instances on Amazon EC2 and I'm in the process of setting up the GPOs. All of the settings of the GPOs are being applied fine, except none of the PowerShell scripts specified on computer startup are actually being executed. The scripts are sitting on a UNC share which has Authenticated Users applied to it with full permissions. I'm assuming it probably has something to do with the Execution Policy, but I'm not sure how to automatically bypass it. I could just go in each instance and bypass the Execution Policy, but that's obviously not a good idea, plus I'm eventually going to connect Windows 7 computers that will be running the same scripts. How can I get the scripts to actually run? Google searches hasn't yielded a whole lot...

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• Fabric doesn't launch Nginx remotely

  - by endofu

  I want to be able to start and stop an nginx server on an Ubuntu EC2 instance with Fabric. I have this two scripts in my fabfile.py: def start_nginx(): sudo('/etc/init.d/nginx start') #also tried this: run('sudo /etc/init.d/nginx start') def stop_nginx(): sudo('/etc/init.d/nginx stop') The start_nginx() seemingly runs without errors (* Starting Nginx Server.../ ...done.) but doesn't start the server (or it dies immediately). If I SSH into the instance this starts nginx perfectly: sudo /etc/init.d/nginx start The stop_nginx() Fabric script stops the server remotely. I compiled nginx from source, using this http://nginx.org/download/nginx-1.1.9.tar.gz and using this script in /etc/init.d: https://github.com/JasonGiedymin/nginx-init-ubuntu/blob/master/nginx. The only thing I modified is this line: DAEMON=/usr/local/sbin/nginx to DAEMON=/usr/sbin/nginx because that's the path I used when I ./configure-d my compile. Does anyone have any idea why the init script behaves differently being called from Fabric?

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• Unable to access Citrix XenApp 6 published applications externally

  - by Christopher McCann

  We are trying to use a trial of Citrix XenApp 6 Fundamentals to virtualise a couple of applications as a proof of concept. We haven't ever used it before so I confess to be a noob with it. We can connect to the XenApp web interface, and the iPad app will connect and list the applications, but the applications themselves will not load. I discovered in the .ica file that it was attempting to connect to the internal IP address of the server instead of its static external. I have been following various threads on Citrix but nothing seems to have fixed it for me. The server is deployed on an EC2 instance with a static elastic IP. All the ports are opened and I can telnet into the XenApp server on 1493 and I get the ICA response. I have also run on ALTADDR and provided the external IP address. Does anyone have any ideas?

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• I can't access phpmyadmin on ubuntu after successfull installation

  - by Rana

  I have ready LAMP environment on my amazon Ec2 micro instance(Ubuntu). I have installed phpmyadmin distribution of ubuntu. selected apache2 as the server, then selected 'yes' for 'db-common-config' option. after its completed, I suppose to access it via http://server/phpmyadmin, right? But I can't access it. Is there any way to verify whether its been installed properly and running properly plz? Or do I have to do anything further? Thanks in advance.

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• Error "fileid changed" when accessing files over NFS

  - by Roman Prikhodchenko

  I have an nfs-kernel-server configured and running on Ubuntu 10.04 Server. /export THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) /export/ebs THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,nohide,insecure,no_subtree_check,async) I mounted the exported folder to the second server: mount -t nfs4 -o proto=tcp,port=2049 NFS_SERVER_IP_HERE:/ebs /ebs and it works just fine. I mounted it to the third server but I cannot access files from it. ls -l /ebs ls: reading directory /ebs: Stale NFS file handle total 0 The syslog on the third server says: kernel: [11575.483720] NFS: server NFS_SERVER_IP_HERE error: fileid changed kernel: [11575.483722] fsid 0:14: expected fileid 0x2, got 0x6e001 Some info: uname -r 2.6.32-312-ec2 uname -m i686

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• can't install sun jdk on ubuntu karmic 9.10

  - by pstanton

  i've just started using a new ec2 install of ubuntu karmic 9.10 and my first task was to install the jdk. when running apt-get install sun-java6-jdk i get the following: Reading package lists... Done Building dependency tree Reading state information... Done Package sun-java6-jdk is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package sun-java6-jdk has no installation candidate i've tried apt-get update as well as adding deb http://us.archive.ubuntu.com/ubuntu/ karmic universe to /etc/apt/sources.list any ideas fellas?

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• Create 301 Redirection in Amazon Route 53 for Wildcard Subdomains

  - by Eric Yin

  My domain name hosted on Route 53 DNS. Amazon has a guide to do 301 redirection for www. To naked domain by point www. version to a S3 static website with 301 setted up. My question is, how can I have *.domain.com all have 301 redirec to naked domain name. I guess either: Some way to get all wildcard subdomains end up into one S3 bucket, how? Or: Use CloudFront on the www. version S3 site and put wildcard subdomains on the CloudFront, but how? Or: There's some hidden settings just lies on Router 53, then where? Or: use EC2, better not suggest me this, too costing for this task. Please advice.

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• Photo Management Software for OS X That Supports Multiple Library Locations

  - by Lance Rushing

  I'm looking at the possibility of changing our photo management software. Thinking about Aperture or Lightroom. And want to know if either supports: Having folders/libraries on separate harddrives/Volumes. Tolerates having network folders occasionally connected Snappy interface A solid enough piece of software as not to crash or behave weirdly. [ so the wife doesn't get stuck and have to call me ;) ] Background The wife is photographer and I'm the computer programmer. Our current setup is Picasa, with a "Recent/Working" folder on the local iMac harddrive, and "Archive" folders on NFS mounted Linux Server, Raid 5, for redundant and extra storage capacity. (the Linux server also syncs with Amazon's EC2) Picasa is doing OK, but I get annoyed when it doesn't do behave properly. Usually around issues when the Linux disk isn't mounted. And overall, I wish Picasa seemed a little more polished and snappier. Thanks, Lance

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• knife server create- finding lists of flavors

  - by JohnMetta

  I'm new to Chef and I think I'm missing something in reading the docs. I want to create servers using knife server create (options) but can't seem to find fully complete documentation on the options. Specifically, how do I find a mapping of server flavors to whatever knife is looking for? Given the official wiki entry for "Launch Cloud Instances with Knife," the following is an example server creation on Rackspace: knife rackspace server create 'role[webserver]' --server-name server01 --image 49 --flavor 2 Likewise, on the Knife Man Page, there are commands for EC2 server images (using --d --distro DISTRO) and for Slicehost servers (using -f --flavor FLAVOR) However, what none of the documentation I've found describes is how to translate what I want to build on Rackspace ("I want Ubuntu 10.04 LTS") to what the integer entry that knife is seeking. It strikes me that, given the lack of a description in the documentation for how to find the flavor, this should be obvious. Thus, I think I'm missing something.

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• Network vulnerability and port scanning services

  - by DigitalRoss

  I'm setting up a periodic port scan and vulnerability scan for a medium-sized network implementing a customer-facing web application. The hosts run CentOS 5.4. I've used tools like Nmap and OpenVAS, but our firewall rules have special cases for connections originating from our own facilities and servers, so really the scan should be done from the outside. Rather than set up a VPS or EC2 server and configuring it with various tools, it seems like this could just be contracted out to a port and vulnerability scanning service. If they do it professionally they may be more up to date than something I set up and let run for a year... Any recommendations or experience doing this?

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• OpenSSL missing during ./configure. How to fix?

  - by P K

  I was trying to install node.js and found OpenSSL support missing during ./configure. How can I fix it? Is it a mandatory step? # ./configure Checking for gcc : ok Checking for library dl : not found Checking for openssl : not found Checking for function SSL_library_init : not found Checking for header openssl/crypto.h : not found /home/ec2-user/node-v0.6.6/wscript:374: error: Could not autodetect OpenSSL support. Make sure OpenSSL development packages are installed. Use configure --without-ssl to disable this message.

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• Improving server security [closed]

  - by Vicenç Gascó

  I've been developing webapps for a while ... and I always had a sysadmin which made the environment perfect to run my apps with no worries. But now I am starting a project on myself, and I need to set up a server, knowing near to nothing about it. All I need to do is just have a Linux, with a webserver (I usually used Apache), PHP and MySQL. I'll also need SSH, SSL to run https:// and FTP to transfer files. I know how to install almost everything (need advice about SSL) with Ubuntu Server, but I am concerned about the security topic ... say: firewall, open/closed ports, php security, etc ... Where can I found a good guide covering this topics? Everything else in the server... I don't need it, and I wanna know how to remove it, to avoid resources consumption. Final note: I'll be running the webapp at amazon-ec2 or rackspace cloud servers. Thanks in advance!!

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• Why aren't Heroku syslog drains logging to rsyslogd?

  - by Benjamin Oakes

  I'm having a problem using syslog drains as described in https://devcenter.heroku.com/articles/logging. To summarize, I have an Ubuntu 10.04 instance on EC2 that is running rsyslogd. I've also set up the security groups as they describe, and added a syslog drain using a command like heroku drains:add syslog://host1.example.com:514. I can send messages from the Heroku console to my rsyslogd instance via nc. I see them appear in the log file, so I know there isn't a firewall/security group issue.  However, Heroku does not seem to be forwarding log messages to the server that heroku drains lists. I would expect to see HTTP requests, Rails messages, etc. Is there something else I can try to figure this out? I'm new to rsyslogd, so I could easily be missing something.

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• getaddrinfo: command not found

  - by jebbie

  I've installed a new Ubuntu 12.04 on an AWS EC2 instance and everything worked fine till now. I followed the instructions in this great tutorial: http://www.exratione.com/2012/05/a-mailserver-on-ubuntu-1204-postfix-dovecot-mysql/ Now i'm on the point "installing monit" and when i restart the service i get this error message now: monit: Cannot translate '(none)' to FQDN name -- Name or service not known I started googling and someone is writing there, that monit uses getaddrinfo in his startup-process to determine the hostname. Ok, so i thought i try out on myself what is getaddrinfo delivering, and then i got: getaddrinfo: command not found I guess, something is missing on my system. Can anyone help?

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• FTP issue - VSFTPd and connecting to from FileZilla

  - by B Tyndall

  I'm trying to connect to a CentOS Linux box that I have hosted on EC2 and I think I have everything configured correctly but when I try to connect I get this series of messages Status: Connection established, waiting for welcome message... Response: 220 (vsFTPd 2.0.5) Command: USER tyndall Response: 331 Please specify the password. Command: PASS ********* Response: 230 Login successful. Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/home/tyndall" Command: TYPE I Response: 200 Switching to Binary mode. Command: PASV Error: Connection timed out Error: Failed to retrieve directory listing Not sure where to start troubleshooting this issue. Any ideas? Do I need to change any permissions? I would think this ID has the ability to see my own home directory. I am able to push/pull files from the command line version of FTP client working on Windows.

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• Web service not accessible from behind corporates firewalls - how come?

  - by Niro

  We run a Saas serving a widget which is embedded in customer websites. The service include static javascript code hosted on amazon S3 and dynamic part hosted on EC2 with Scalr (using scalr name servers). We received some feedback from users behind corporate firewalls that they cant access our service (while they can access the sites including the widget). This does not make sense to me since the service is using normal http calls on port 80 and our URL is quite new without any reason to be banned by firewalls. My questions are: 1. Why is the service is not accessible and what can I do about it? 2. Is it possible that one of the following is blocked by corporate firewalls: Amazon s3, the dynamic IP address provided by amazon, Scalr name servers. Any other possible reasons, way to check them and remedies for this? Thanks!

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• MySQL Daemon failed to start

  - by T. Brian Jones

  THE SETUP I'm running Linux CentOS on an Amazon EC2 instance. The MySQL data files are on an EBS Drive mounted at /data/ ( symlink - /var/lib/mysql /data/mysql ). Everything works fine in this setup. THE PROBLEM I'm trying to move everything from this EBS drive to a new drive. I umounted the /data/ drive, and mounted it at /data2/. Then I mounted the new drive at /data/ and copied everything over to it from /data2/. Everything on the system works great, except MySQL. Every time I try to start the MySQL daemon ( /etc/init.d/mysqld start ) I get a MySQL Daemon failed to start error.

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• Network Path not found while joining Active Directory

  - by Chiggins

  So I have an Amazon EC2 box running Windows Server 2008 with Active Directory installed on it. I also have a Windows 7 virtual machine, which is set to use the Active Directory box as its DNS and WINS server. I'm trying to join the virtual machine to the domain, and I'm asked for authentication. I give authentication, wait a minute, and I get an error saying: The following error occurred attempting to join the domain "ad.chigs.me": The network path was not found. How can I fix this so that I'll be able to join the domain?

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• Maximizing TCP connections on HAProxy load balancer

  - by imaginative

  I am currently using HAProxy in order to load balance tcp connections from clients to my Erlang app server. The connection is persistent, which means I'm limited to roughly 64K clients on an optimized server (I'm currently running HAProxy on an m1.large EC2 instance). My app server is designed to horizontally scale based on the number of TCP connections. What's worrying me though is I'll need an equal number of HAProxy servers as app servers since it's a 1:1 connection. Is there currently a way to "proxy" the tcp connection to the app server so that once HAProxy sends the client off to my Erlang server, it can free up the connection, ready to serve another client? Are there any papers, existing solutions out there I can read so that I only have to worry about the 64K limit on my app servers, and not on the load balancing servers themselves?

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• My server appears to have been hacked+ scanssh run by zabbix is it normal?

  - by Niro

  I'm running a few EC2/Scalr instances with zabbix monitoring. I received complaints about one of my servers port scanning other servers. the logs show it is accessing port 22 on consecutive IP addresses. I looked at the processes list and saw scanssh is running under the user Zabbix. My question is- Is scanssh part of zabbix? Is it suppesd to run? I have active autodiscovery on zabbix but it is looking at another IP addresses and definately not port 20. Is it possible that something in the config of zabbix agent is controlling it and not the settings on zabbix server? What can I do to find out if zabbix is somehow misbehaving or it is a hacker? Any advice is highly appreciated.

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• Challenges w.r.t. proximity between application hosted outside Amazon and Amazon persistence service

  - by Kabeer

  Hello. This is about hosting a web portal. Earlier my topology was entirely based on Amazon AWS but the price factor (especially for EC2) now makes me re-think. I'll now quickly come to what I have finally arrived at. I'll launch the portal that'll be hosted on Godaddy (unlimited plan on Windows). The portal uses SimpleDB for storing metadata and S3 for blobs. Locally available MySQL will be used for the ASP.Net provider services. Once the portal is profitable, I intent to move to Amazon in totality. Now considering the proximity between Godaddy & Amazon, would I face 'substantial' performance problems? Are there any suggestions to improve upon my topology.

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