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• Retrieve MS SQL database or table structure in XML

  - by clutch

  Is there a way to export the database schema in well formed XML of a MS 2000 SQL Server. I'm looking for just the structure not the data and the more detailed the better. The XML may be used in a migration processes. I'm more familiar with MySQL then with SQL Server so please be detailed if you have time. Thanks

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• Configuring memcached for a particular scenario

  - by pradeepchhetri

  I have a web application which queries opentsdb server(which in backend using Hbase cluster) for the datapoints of different metrics and using dygraph javascript graphing library, I am plotting those metrics. Since getting all the datapoints of past one day from opentsdb for a particular metric is itself taking nearly 2 seconds, my application which is plotting nearly 25 metrics is becoming very slow. In order to reduce this latency, I am thinking of using memcached module of php5 for caching all the queries. But I have few questions regarding memcached. Is there any way I can configure memcache to keep on updating its cache in the background by running some command line queries after particular interval of time. Is there any way I can configure memcache to always reply for a query using cache instead of first updating its cache because my application just plots datapoints for past one day. Missing out some datapoints is not that critical.

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• Should UNIX users have the same group

  - by jason

  I have a web server (Ubuntu 12.04 LTS if needed) multiple people use with Apache, PHP5, and MySQL installed. All users have access to SSH. All users home directory's are /home/USER I was wondering: What usergroup should users be in; or should they have their own usergroups()? What user and group should Apache run under? What file permissions should the users /home/USER/public_html and /home/USER directory's be, as well as subsequent files (including such PHP files w/ sensitive information such as DB passwords) Thanks :)

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• How to discover which name/address connections from one network to another uses?

  - by Jader Dias

  In MySQL you have to authorized a user based on the name of the origin network. From my network to a remote one all connections appear as sent from mail.mycompany.com. But connections to another remote network it appears with a different origin. How to discover which name/ip it is using? I tried tcpdump and netstat in the destination but it is difficult to find my connection among billions of others. In my case the destination is a Windows Server 2003

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• Can all-in-one desktops be good developer machines?

  - by user6900

  I was just going through some all-in-one desktop PCs (Dell Studio One, HP Touch Smart, Lenovo IdeaCenter, etc.) and their specs really look good (4 GB RAM, 2.x GHz Core 2 Duo, etc.) Are there any disadvantages of such PCs as a developer machine? I mostly do Java (Eclipse + MySQL + Tomcat / JBoss) or .NET (Visual Studio + MsSQL) development. Edit: One common question I could see is harddrive size and that's around 320 GB 7200 RPM.

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• What's a good tool for collecting statistics on filesystem usage?

  - by Kamil Kisiel

  We have a number of filesystems for our computational cluster, with a lot of users that store a lot of really large files. We'd like to monitor the filesystem and help optimize their usage of it, as well as plan for expansion. In order to this, we need some way to monitor how these filesystems are used. Essentially I'd like to know all sorts of statistics about the files: Age Frequency of access Last accessed times Types Sizes Ideally this information would be available in aggregate form for any directory so that we could monitor it based on project or user. Short of writing something up myself in Python, I haven't been able to find any tools capable of performing these duties. Any recommendations?

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• 256MB VPS on XEN

  - by user63410

  I am thinking of getting a 256MB server on XEN but not sure is it capable of handling this setup: Varnish + Nginx + Eaccelerator + PHP-FM + MySQL + Mail/FTP? I've tried this setup on OpenVZ and it was partly disastorous, especially with varnish in the equation, i've heard that XEN is better at memory management, sometimes shaving off 50mb or more in comparison to OpenVZ setups... if anyone has any helpful suggestions / input please let me know thanks

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• Postfix cleanup daemon access control

  - by Flimzy

  Is there any way to control which hosts are permitted to connect to the cleanup daemon over TCP? Our 'master.cf' contains: 2526 inet n - - - 0 cleanup This is necessary because we have a cluster of SMTP servers running custom code, and they can all inject mail to the centralized postfix server via the cleanup daemon. However, we want to allow only our authorized servers to connect to the cleanup daemon. The current configuration allows any host to connect to port 2526. Clearly we can use iptables to restrict access, but is there a way to do this within postfix itself?

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• virutal users in postfix

  - by facha

  Hello everyone, I'd like to setup postfix as an MTA for 2 domains, about 10 users each. I'm a bit confused with the documentation. Postfix has so many options for mail delivery. I'd like to have a simple file where I would store all the email addresses (and possibly their corresponding mailboxes). I wouldn't like neither system's passswd file nor mysql to be used for storing email users. What parts of documentation I should be focused on?

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• Forensics on Virtual Private servers [closed]

  - by intiha

  So these days with talks about having hacked machines being used for malware spreading and botnet C&C, the one issue that is not clear to me is what do the law enforcement agencies do once they have identified a server as being a source or controller of attack/APT and that server is a VPS on my cluster/datacenter? Do they take away the entire machine? This option seems to have a lot of collateral damage associated with it, so I am not sure what happens and what are the best practices for system admins for helping law enforcement with its job while keeping our jobs!

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• RSAT and double accounts

  - by Ryaner

  Since we are looking at migrating our domain admins to use non domain-admin accounts and runas for admin tasks a discussion has begun. How do others use RSAT with runas? I know you can Shift+RightClick run as other user to launch it with admin rights, but it looses the icon on the taskbar. The question also has been put, why do Microsoft release the RSAT tools if they recommend admins to run using non-domain accounts. Edit: Further to this, some of the initial testing with RSAT via the run as other user command hasn't worked out well. Few of the options don't function in the Hyper-V and Failover Cluster Manager.

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• var/www/ permissions

  - by mk_89

  I have purchases a server today and I am almost through configuring it, I have managed to install mysql and have enabled a firewall which allows access to ports 80, 22 and 443 I am trying to test out a simple php file to see whether all is well but I get a 404 Not found error, I am certain that this file exists which was created using vi as I have confirmed it using Filezilla. What am I missing? is there another step that I must take to allow a simple php file to work.

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• Can I recover files on a disk With 5% of start of disk completely wiped (overwritten with 1s)

  - by ARA

  Recently a virus attacked my pc and cleared 5% of my hard disk which has one partition I viewed the disk in a hex viewer program like active undelete ,cleared the virus data and overwrote it with 1s I want to recover a large file that is about 10gb, but no recovery tools seem to be able to recover any files. I want to know ,in theory, is this file recoverable ? I think that files are fragmented, researched about NTFS File System and i understand cluster information are just saved in MFT File ? Is there any way to recover file without a MFT structure ?

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• Why does this process keep showing up in my Apache server status?

  - by mmattax

  I keep seeing this "..reading.." process in my Apache Server Status, does anyone know what this is from? It seems when the server performance is degrading, I see a few of these, I would love to know what they mean and how (if possible) to prevent it. The servers (3 web servers) are running RHEL and are hosting a PHP/MySQL application.

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• Multiple public/private key pairs for the same user

  - by bruceb

  First, sorry if this question has already been asked/answered - I've searched but perhaps I haven't recognised the answer.... What we have is a cluster of servers which need to access a single remote server using sftp. We are migrating from one remote server to another at the same (remote) location. We also want to refresh the public/private key pairs on the configuration as part of an ongoing security review. My question is - can we have multiple public/private key pairs for the same user between server A and server B? I want to do this to allow for cutover testing - but am concerned that the software checking keys may only try one of each type (rsa/dsa?) before rejecting the connection method and moving to the next type of key. Hope it's a straightforward question - please let me know if I need to supply more details. Thanks in advance Bruce

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• Which guide do you recommend on setting up Nginx

  - by Saif Bechan

  I am setting up an LEMP (Nginx, MySQL, PHP on Linux) from scratch. There are a lot of guides available online in all different forms. Now I want a setup with virtual hosts, and only serve dynamic content (PHP). My static files(images,css,js) are on a CDN. Do you know of a good guide on setting up the LEMP installation.

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• MongoDB PHP EC2 Setup Configuration

  - by nathansizemore

  I am new to web development and server set up. I am looking for some advice or a link to a tutorial on setting up a production system up. Right now, I have a server (Ubuntu, Apache, MongoDB, and PHP). It receives a request, PHP queries Mongo, and PHP sends out the requested data. How do I make that work with more servers? I've read that you can make a cluster of a primary and two slave nodes which work as separate servers running Mongo, but do those also run PHP? Or is the primary the only one running the PHP? I have read some docs on Mongo site and a video of someone from 10gen going through it, but they are geared towards people that seem to already understand this stuff, I have no idea and need to start from a beginning stage. If anyone can help me understand where PHP (Acting as my API) lives in these clusters, that would be greatly appreciated! Thanks in advance for any help!

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• How to register rss for a website?

  - by domainking

  I am not sure if I ask this question in the right place, because I am new to it. What I want to ask is, do I need to register/create RSS for my website? I have a website, lets say: [http://blog.domain.com] = its a 2.9.2 wordpress blog So, if I want to display the latest content in another subdomain, for example: [news.domain.com], how do I do that? I know a little bit of php and mysql.

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• Restarting services shortcut on FreeBSD

  - by eugene y

  I want to start/stop services from /usr/local/etc/rc.d in the RHEL way, e.g. service apache restart service mysql restart How can I set this up on FreeBSD?

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• Windows 2012 Master & Ubuntu Bind 9 Slave & SOA

  - by RecentCoin

  I'm kinda like the maid... I don't do Windows. But thanks to new things we're implementing, I'm now attempting replicating a single zone from our AD cluster. We had this working just fine but someone had to "adjust" it. That broke the replication completely. We've gotten that restarted but now a different DC is showing as the SOA. Does it matter which of the domain controllers is listed as the SOA? The contents of the zone file appear to be correct. Part of me says "Good enough. Leave it be." but the rest of me doesn't want a 3AM phone call. So does anyone know if it matters which DC is listed as the SOA?

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• High Availability Clustering and Virtualization

  - by tmcallaghan

  I'm trying to understand how the various virtualization vendors (specifically Amazon EC2, but also VMware and Xen) enable software vendors to provide a real HA solution in the environment where the servers are virtualized. Specifically, if I'm running any HA application (exchange, databases, etc) I need to ensure that my redundant virtual "servers" aren't located on the same physical server. Using in-house virtualization solutions (VMware, Xen, etc) I can provision accordingly as well as check the virtual - physical arrangement. I could, however, accidentally "vmotion" to the same physical hardware. With EC2, I don't even have the ability at provision time to select different physical servers. Since their Cluster Compute Instances are 1 virtual server per physical server it seems to be the only way to guarantee I don't have a false sense of redundancy. Any ideas or thoughts would be helpful. What are others doing about this problem? If the vendors provided an API where I could get something as simple as a unique physical system identifier I could at least know if I'm going to have an issue. -Tim

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• Drop caches in Linux

  - by BerserkEVA

  I have an embedded Geode-based application server with 512MB RAM and I'm about to try to maximize free memory during applications workload, which uses MySQL database 5.5 with InnoDB quite aggressively. As part of the whole optimization I'd want to introduce echo 1 > /proc/sys/vm/drop_caches sleep 5 echo 0 > /proc/sys/vm/drop_caches in crontab. How often is it safe to execute something like this? Any other observation/suggestion is welcome.

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• Other processes take over port 80 when restarting Apache - why, and how to solve?

  - by user72149

  I have a CentOS 5.5 server running Apache on port 80 as well as some other applications. All works fine until I for some reason need to restart the httpd process. Doing so returns: sudo /etc/init.d/httpd restart Stopping httpd: [ OK ] Starting httpd: (98)Address already in use: make_sock: could not bind to address [::]:80 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs First I thought perhaps httpd had frozen and was still running, but that was not the case. So I ran netstat to find out what was using port 80: sudo netstat -tlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 *:7203 *:* LISTEN 24012/java tcp 0 0 localhost.localdomain:smux *:* LISTEN 3547/snmpd tcp 0 0 *:mysql *:* LISTEN 21966/mysqld tcp 0 0 *:ssh *:* LISTEN 3562/sshd tcp 0 0 *:http *:* LISTEN 3780/python26 Turns out that my python process had taken over listening to http in the instant that httpd was restarting. So, I killed python and tried starting httpd again - but ran into the same error. Netstat again: sudo netstat -tlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 *:7203 *:* LISTEN 24012/java tcp 0 0 localhost.localdomain:smux *:* LISTEN 3547/snmpd tcp 0 0 *:mysql *:* LISTEN 21966/mysqld tcp 0 0 *:ssh *:* LISTEN 3562/sshd tcp 0 0 *:http *:* LISTEN 24012/java Now my java process had taken over listening to http. I killed that too and could then successfully restart httpd. But this is a terrible workaround. Why will these python and java processes start listening to port 80 as soon as httpd is restarted? How to solve? Two other comments. 1) Both java and python processes are started by apache from a php script. But when apache is restarted, they should not be affected. And 2) I have the same setup on two other machines running Ubuntu and there's no problem there. Any ideas? Edit: The Java process listens to port 7203 and the python process supposedly doesn't listen to any port. For some reason, they start listening to port 80 when apache is restarted. This hasn't happened before. On Ubuntu it runs fine. For some reason, on my current CentOS 5.5 machine, this problem arises.

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• Apache + Passenger, requests not forwarded to Rails

  - by olalonde

  I'm trying to set up Apache + Passenger (mod_rails) and everything works fine except Apache won't forward requests to Rails. From my Apache log: File does not exist: /var/www/rails_apps/domain.com/public/controllerName My Rails app works fine with Mongrel and I also have some PHP/MySQL sites running fine. I have no .htaccess in my Rails app directory. What is going wrong? How could I troubleshoot this problem ?

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• How can I control WiFi clients that, authenticated with radius server (FreeRADIUS) and Active directory [on hold]

  - by Debian

  In order to Authenticate WiFi clients, I have FreeRadius server that works with Active Directory. My question is that, Now all users in Active Directory can connect to WLAN. How can I control them with FreeRradius server. I mean now all people can connect to network and I can not control them. Honestly I don't know how can I control them. FreeRadius was installed on CentOS 6.5 and I don't have mysql. Thanks,

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