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• How to set minimum SQL Server resource allocation for a database?

  - by Jeff Widmer

  Over the past Christmas holiday week, when the website I work on was experiencing very low traffic, we saw several Request timed out exceptions (one on each day 12/26, 12/28, 12/29, and 12/30) on several pages that require user authentication. We rarely saw Request timed out exceptions prior to this very low traffic week. We believe the timeouts were due to the database that it uses being "spun down" on the SQL Server and taking longer to spin up when a request came in. There are 2 databases on the SQL Server (SQL Server 2005), one which is specifically for this application and the other for the public facing website and for authentication; so in the case where users were not logged into the application (which definitely could have been for several hours at a time over Christmas week) the application database probably received no requests. We think at this point SQL Server reallocated resources to the other database and then when a request came in, extra time was needed to spin up the application database and the timeout occurred. Is there a way to tell SQL Server to give a minimum amount of resources to a database at all times?

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• Securely executing system commands as sudo from PHP

  - by Aydin Hassan

  Is it possible? I have written a command line tool in PHP for creating new environments for our company. It creates system users, directories, databases, VHosts and restarts apache, amongst other things. These commands require sudo privileges. I thought it might be a nice idea to have a web-interface for it, to make it easier for other non-developers to use. The web app would be behind authentication. When running from the command line I just run sudo tool.php, obviously I can't do this from a web app. How could I do this securely? Giving the apache user sudo access seems silly, as this would means all sites hosted on the box (eg all our environments) would have sudo access. Is it possible to make this tool run under a different user? this user could have sudo privileges for only the commands I need? How do things like plesk and cPanel do this? Any thoughts?

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• How to recover the plesk database?

  - by Kau-Boy

  When I try to launch the Plesk administration page of you server I get the following error: ERROR: PleskMainDBException MySQL query failed: MySQL server has gone away The MySQL Server is working well. Although it seems that the plesk database is somehow corrupt and any action on this database results in a restart of the mysql process, so even queries to other databases on the same MySQL server will be lost. If I try to connect to the plesk database using phpMyAdmin, I can only see the number of tables, the database had originally. But I am not able to open the tables listing. As soon as I try it, the mysql process crashes again. Trying to connect to the database using ssh works. I can even run a SELECT statement against any table an get a result. I don't know if it is an plesk error or an error of the psa database or even the MySQL server. Can you give me any tips on how to recover the plesk system. Should I try to repair the Plesk installation before. And if so, how can I do it and will all my settings get lost doing it? EDIT: Trying to dump the database, I get the following error: mysqldump: Got error: 2013: Lost connection to MySQL server during query when using LOCK TABLES

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• How to configure mod_proxy_balancer to gracefully fail under high load

  - by bramp

  We have a system which has one Apache instance in front of multiple tomcats. These tomcats then connect to various databases. We balance the load to the tomcat with mod_proxy_balancer. Currently we are receiving 100 requests a second, the load on the Apache server is quite low, but due to database heavy operations on the tomcats, the load there is roughly 25% (of what I estimate they can handle). In a few weeks there is an event happening and we estimate that our requests will jump significant, maybe by a factor of 10. I'm doing everything I can do reduce the load on our tomcats, but I know we are going to run out of capacity, so I would like to fail gracefully. By this I mean, instead of trying to deal with too many connections which all timeout, I would like Apache to somehow monitor average response time, and as soon as the response time to Tomcat is getting above some threshold, I would like a error page displayed. This means that users who are lucky still get a page rendered quickly, and those who are unlucky get a error page quickly. Instead of everyone waiting far too long for their page, and eventually everyone timing out, and the database being swamped with queries which are never used. Hopefully this makes sense, so I was looking for suggestions on how I could achieve this. thanks

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• Oracle logical standby fails with ORA-01919

  - by DCookie

  I have an Oracle logical standby database being managed via data guard. Just this morning the redo apply process began failing with an ORA-01919 error, indicating one of our application roles did not exist. However, I can see the role on both primary and standby databases. We also have a physical standby that has long since applied the redo where this is happening on the logical, without issue. I have opened an SR with Oracle. I was wondering if anyone out there has seen this before. I guess I should mention: Oracle 10.2.0.4, Win2003 Server SP2. UPDATE: So far, Oracle Support has not provided an answer. I thought I'd post here what I have learned so far. It appears that a grant of DBA on the primary host to a role works fine for users granted the role. It does not work on the logical standby. IOW: create role TEST; grant dba to TEST; grant TEST to auser; connect auser set role TEST; grant <existing role> to <existing user>; This works on the primary instance but fails on the logical. A workaround appears to be to grant each role on the primary to the role TEST with admin option in the logical: grant <existing role> to TEST with admin option; <== do this on the logical standby Then the command works on the logical standby.

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• Ubuntu karmic, chroot, Ubuntu server 8.04 LTS and Plesk

  - by morpheous

  I am pretty new to the Linux environment, and although I have been using Ubuntu Karmic desktop for development work, I have always prefered the GUI tools and very rarely use the terminal. I am about to launch a site (a VPS) which will be running Ubuntu server 8.04 LTS and Plesk. I want to install both the server (8.04 LTS) and Plesk in a 'chroot' on my Karmic desktop. I also want to test install some packages I have written for the server, and generally familiarize myself with the environment before I signup to the hosting service. I will be running a streamline server (no GUI), with only the following software: PHP Python mySQL PostgreSQL Apache Plesk Third party packages I developed In terms of mail, I think the hosting provider provides a mail service, so I dont know if I will need to run my own mail server. I will like some advice on the following: How can I install Ubuntu 8.0.4 server LTS in a chroot? How can I install Plesk in Ubuntu 8.0.4 server LTS (from the command line) Can anyone recommend how I back up the remote server when I go live (i.e. what tools to use)?. I will need to back up both databases, as well as some config data and installation packages

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• Best tool for monitoring backups, etc. and trending statstics from that data

  - by Randy Syring

  I have done some research on nagios, opennms, and zenoss but am not confident that I have found what I am looking for. The main driving force for me right now is being able to monitor backups. This includes mysql, mssql, and eventually some file system backups. We have a tool that wraps the backup process for these different systems and collects statistics. So, items like: number of databases backed up size of db backup file size of db backup file compressed time to make backup time to zip file I want to be able to A) have notifications if the jobs are not run according to schedule B) be able to set thresholds on the statistics which would trigger notifications C) I want to be able to trend and graph the statistics I am planning on sending this information to the monitoring application through an HTTP POST. Or, the monitoring application could pull it from a log file as well. However, we will have other processes with other "arbitrary" (from the monitoring system's perspective) statics that will want to monitor and trend, so flexibility is very important. The tool or tools should also be able to do general monitoring and trending of network interfaces, server load, etc. Once we get the backup monitoring in place, we will want to include those items as well. Thanks.

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• SQL Server Database In Single User Mode after Failover

  - by jlichauc

  Here is a weird situation we experienced with a SQL Server 2008 Database Mirroring Failover. We have a pair of mirrored databases running in high-availability mode and both the principal and mirror showed as synchronized. As part of some maintenance I triggered a manual failover of the principal to the mirror. However after the failover the principal was now in single-user mode instead of the expected "Principal/Synchronized" state we usually get. The database had been in multi-user mode on the previous principal before this had happened. We ended up stopping all applications, restarting the SQL Server instances, and executing "ALTER DATABASE ... SET MULTI_USER" to bring the database back to the expected "Principal/Synchronized" state in a multi-user mode. Question. Does anyone know where SQL Server stores information about whether a database should be in single-user mode or not? I'm wondering if there is some system database or table that has this setting recorded somewhere. In particular we had an incident once with the database on the original principal (the one I was failing over to) where when trying to detach the database it was put into single-user mode. I'm wondering if that setting is cached somewhere and is the reason that SQL Server put it back into single-user mode after a failover.

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• Testing realistic loads for new versions of existing web app

  - by David Cournapeau

  Assuming I have a relatively complex web application, I am interested in testing performances of a new version using a traffic as realistic as possible. Traffic is relatively complex (session-based, lots of internal logic which depends on incoming requests). The webapp depends on many servers (databases, frontends, etc...). I can think of two basic directions: Recording every incoming request with its timestamp in production in a centralized manner and replaying it from N clients to reproduce a load as close as possible as the original. Issue: because we have many servers, getting the centralized log is not trivial. having a system duplicating requests to a staging area so that I could "plug" a dev version of my webapp to it at anytime without affecting the production. Issue: I have not found much information about it expect this, which suggests to me that may not be the best solution. OTOH, it is realistic by definition. What is the standard way of doing this kind of testing ? I did not find much information about load testing with complex, realistic traffic.

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• OS X: Storing MySQL data securely, on an encrypted FileVault image using a soft link

  - by GJ

  I am trying to get a macports-installed MySQL to use a data directory stored inside my FileVault-protected home dir. I used sudo cp -a /opt/local/var/db/mysql5 ~/db/ (the -a to ensure file permissions remain intact) and then replaced the original mysql5 directory with a soft link: sudo ln -s ~/db/mysql5 /opt/local/var/db/mysql5 However, when I now try to start MySQL it fails. It follows the soft link at least to the extent that it modifies some files in the ~/db/mysql5 dir, notably the error log which gets appended to it this: 110108 15:33:08 mysqld_safe Starting mysqld daemon with databases from /opt/local/var/db/mysql5 110108 15:33:08 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead. 110108 15:33:08 [Warning] '--log_slow_queries' is deprecated and will be removed in a future release. Please use ''--slow_query_log'/'--slow_query_log_file'' instead. 110108 15:33:08 [Warning] '--default-character-set' is deprecated and will be removed in a future release. Please use '--character-set-server' instead. 110108 15:33:08 [Warning] Setting lower_case_table_names=2 because file system for /opt/local/var/db/mysql5/ is case insensitive 110108 15:33:08 [Note] Plugin 'FEDERATED' is disabled. 110108 15:33:08 [Note] Plugin 'ndbcluster' is disabled. /opt/local/libexec/mysqld: Table 'mysql.plugin' doesn't exist 110108 15:33:08 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 110108 15:33:09 InnoDB: Started; log sequence number 4 1596664332 110108 15:33:09 [ERROR] /opt/local/libexec/mysqld: Can't create/write to file '/opt/local/var/db/mysql5/mac.local.pid' (Errcode: 13) 110108 15:33:09 [ERROR] Can't start server: can't create PID file: Permission denied 110108 15:33:09 mysqld_safe mysqld from pid file /opt/local/var/db/mysql5/gPod.local.pid ended I can't see why MySQL can't create the pid file, since manually creating it using the _mysql user succeeds (sudo -u _mysql touch mac.local.pid from inside ~/db/mysql5) Any ideas how to resolve this?

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• How to configure mod_proxy_balancer to gracefully fail under high load

  - by bramp

  We have a system which has one Apache instance in front of multiple tomcats. These tomcats then connect to various databases. We balance the load to the tomcat with mod_proxy_balancer. Currently we are receiving 100 requests a second, the load on the Apache server is quite low, but due to database heavy operations on the tomcats, the load there is roughly 25% (of what I estimate they can handle). In a few weeks there is an event happening and we estimate that our requests will jump significant, maybe by a factor of 10. I'm doing everything I can do reduce the load on our tomcats, but I know we are going to run out of capacity, so I would like to fail gracefully. By this I mean, instead of trying to deal with too many connections which all timeout, I would like Apache to somehow monitor average response time, and as soon as the response time to Tomcat is getting above some threshold, I would like a error page displayed. This means that users who are lucky still get a page rendered quickly, and those who are unlucky get a error page quickly. Instead of everyone waiting far too long for their page, and eventually everyone timing out, and the database being swamped with queries which are never used. Hopefully this makes sense, so I was looking for suggestions on how I could achieve this. thanks

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• MAMP MySQL won't start

  - by Tony

  I uninstalled MAMP completely, downloaded fresh copy of MAMP 2 from the MAMP website, did a clean install. However, when I try to start mysql, I get the following error log 111120 21:37:49 mysqld_safe Starting mysqld daemon with databases from /Applications/MAMP/db/mysql 111120 21:37:50 [Warning] You have forced lower_case_table_names to 0 through a command-line option, even though your file system '/Applications/MAMP/db/mysql/' is case insensitive. This means that you can corrupt a MyISAM table by accessing it with different cases. You should consider changing lower_case_table_names to 1 or 2 111120 21:37:50 [Note] Plugin 'FEDERATED' is disabled. 111120 21:37:50 InnoDB: The InnoDB memory heap is disabled 111120 21:37:50 InnoDB: Mutexes and rw_locks use GCC atomic builtins 111120 21:37:50 InnoDB: Compressed tables use zlib 1.2.3 111120 21:37:50 InnoDB: Initializing buffer pool, size = 128.0M 111120 21:37:50 InnoDB: Completed initialization of buffer pool 111120 21:37:50 InnoDB: highest supported file format is Barracuda. 111120 21:37:50 InnoDB: Waiting for the background threads to start 111120 21:37:51 InnoDB: 1.1.5 started; log sequence number 1595675 111120 21:37:51 [ERROR] /Applications/MAMP/Library/bin/mysqld: unknown option '--skip-locking' 111120 21:37:51 [ERROR] Aborting 111120 21:37:51 InnoDB: Starting shutdown... 111120 21:37:51 InnoDB: Shutdown completed; log sequence number 1595675 111120 21:37:51 [Note] /Applications/MAMP/Library/bin/mysqld: Shutdown complete 111120 21:37:51 mysqld_safe mysqld from pid file /Applications/MAMP/tmp/mysql/mysql.pid ended I've no clue why this is happening. I googled around and made sure that no instance of MySQL is running. Nothing seems to help.

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• High load average due to high system cpu load (%sys)

  - by Nick

  We have server with high traffic website. Recently we moved from 2 x 4 core server (8 cores in /proc/cpuinfo), 32 GB RAM, running CentOS 5.x, to 2 x 4 core server (16 cores in /proc/cpuinfo), 32 GB RAM, running CentOS 6.3 Server running nginx as a proxy, mysql server and sphinx-search. Traffic is high, but mysql and sphinx-search databases are relatively small, and usually everything works blazing fast. Today server experienced load average of 100++. Looking at top and sar, we noticed that (%sys) is very high - 50 to 70%. Disk utilization was less 1%. We tried to reboot, but problem existed after the reboot. At any moment server had at least 3-4 GB free RAM. Only message shown by dmesg was "possible SYN flooding on port 80. Sending cookies.". Here is snippet of sar 11:00:01 CPU %user %nice %system %iowait %steal %idle 11:10:01 all 21.60 0.00 66.38 0.03 0.00 11.99 We know that this is traffic issue, but we do not know how to proceed future and where to check for solution. Is there a way we can find where exactly those "66.38%" are used. Any suggestions would be appreciated.

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• Backing up SQL NetApp Snapshots using TSM

  - by WerkkreW

  In our environment we have a 3 node SQL 2005 Cluster which is on NetApp storage. We are currently using SMSQL (NetApp SnapManager for SQL) to take Snapshot backups of the data. This works great, but due to some audit requirements we are also forced to maintain some copies on tape. We have used NDMP in other places across the enterprise but we do not want to use it in this specific instance. Basically what I need to do is, get the most recent snapshot copy of the databases on tape, via Tivoli Storage Manager (TSM). What I have done is, obtained a basic Windows Server 2003 VM with SnapDrive installed, which is SAN attached and zoned to the NetApp, and I have written a batch file to do the following: Mount the latest __RECENT snapshot lun to the host, using a specific drive letter Perform a TSM based incremental backup Dis-mount the LUN This seems to work fine, except sometimes the LUN's do not mount due to some sort of timeout. Also, due to my limited knowledge of windows batch scripting, I have no way to monitor the success or failure of these backups since I do not know how to send a valid return code back to the TSM scheduling service. Is there a more efficient/elegant way to accomplish this without NDMP?

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• How do I secure Sql Server 2008 R2

  - by Mark Tait

  I have both a dedicated and a VPS (from Fasthosts) virtual server - the web sites/applications I run on these, access Sql Server stored on the same web server. Until now, I have logged onto Sql Server on both the deidicated and VPS server, from Sql Server Management Studio - until I noticed in my server application logs, multiple attempts to logon to Sql Server using the 'sa' username, but failed password. So someone/bot is trying hard (repeatedly every couple of hours, for approx 20 attempts during each instance) to log on... so obviously I have to lock down access to Sql Sever remotely. What I have done is gone into Configuration Manager, and in Sql Server Network Configuration - Protocols for Sql2008 and also in Sql Native Client 10.0 Configuration - Client Protocols - I have diabled Named Pipes, TCP/IP (and VIA by default). I have left Shared Memory enabled. I also disabled in Sql Server Services, the Sql Server Browser. Now the only way I can manage the databases on these servers, is by logging on to them via Remote Desktop. Can anyone confirm if this is the correct way of stopping anyone maliciously logging on to Sql Server? (I'm not a DBA or security expert - and there are hundreds of articles advising all different ways - but I was hoping for the experts here to confirm, or otherwise, if what I've done is correct) Thank you, Mark

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• OS X: MySQL not dealing properly with data directory via soft link

  - by GJ

  I am trying to get a macports-installed MySQL to use a data directory stored inside my FileVault-protected home dir. I used sudo cp -a /opt/local/var/db/mysql5 ~/db/ (the -a to ensure file permissions remain intact) and then replaced the original mysql5 directory with a soft link: sudo ln -s ~/db/mysql5 /opt/local/var/db/mysql5 However, when I now try to start MySQL it fails. It follows the soft link at least to the extent that it modifies some files in the ~/db/mysql5 dir, notably the error log which gets appended to it this: 110108 15:33:08 mysqld_safe Starting mysqld daemon with databases from /opt/local/var/db/mysql5 110108 15:33:08 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead. 110108 15:33:08 [Warning] '--log_slow_queries' is deprecated and will be removed in a future release. Please use ''--slow_query_log'/'--slow_query_log_file'' instead. 110108 15:33:08 [Warning] '--default-character-set' is deprecated and will be removed in a future release. Please use '--character-set-server' instead. 110108 15:33:08 [Warning] Setting lower_case_table_names=2 because file system for /opt/local/var/db/mysql5/ is case insensitive 110108 15:33:08 [Note] Plugin 'FEDERATED' is disabled. 110108 15:33:08 [Note] Plugin 'ndbcluster' is disabled. /opt/local/libexec/mysqld: Table 'mysql.plugin' doesn't exist 110108 15:33:08 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 110108 15:33:09 InnoDB: Started; log sequence number 4 1596664332 110108 15:33:09 [ERROR] /opt/local/libexec/mysqld: Can't create/write to file '/opt/local/var/db/mysql5/mac.local.pid' (Errcode: 13) 110108 15:33:09 [ERROR] Can't start server: can't create PID file: Permission denied 110108 15:33:09 mysqld_safe mysqld from pid file /opt/local/var/db/mysql5/gPod.local.pid ended I can't see why MySQL can't create the pid file, since manually creating it using the _mysql user succeeds (sudo -u _mysql touch mac.local.pid from inside ~/db/mysql5) Any ideas how to resolve this?

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• Moving a lotus database causes incoming mail failure

  - by Logman

  Hey all, I moved a couple lotus note databases to another hd (ran out of space) by using a directory link/pointer on the domino server. USed a text file with the .DIR ext with the desired new path etc... well that works fine. I open up a lotus notes client, use the id and then OPEN the database. The directory link works fine, the new location of the db is opened with no problems. We found out that we couldnt FORWARD any mail: We did the following to make it work: Goto menu FILE|MOBILE|EDIT CURRENT LOCATION Goto tab MAIL and enter the correct path for "Mail File:" example: it should read "mail\morespace\flabor" and not "mail\flabor" "morespace" = directory link/pointer we can forward and reply to emails fine after that fix. The problem is that the user has no incoming email. Domino is still trying to send the incoming mail of that user to its old db location "mail\flabor" instead of "mail\morespace\flabor". Delivery error saying user does not exist. Is this a cache problem? We have reset the server ("Q" at the prompt), though we have not completely shut it down though. Thanks Frank

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• Log Shipping breaking daily on SQL Server 2005

  - by IT2

  I am facing a somewhat serious problem with Log Shipping on SQL Server 2005 and I am having trouble to correct it, so I will try some help from SF's experts. I have a Windows 2003 Server (PROD) that ships transactional log backups to another two servers: STAND1: Windows 2003 Server with SQL Server 2005. STAND2: Windows 2008 R2 Server with SQL Server 2005. The problem is that Log Shipping to STAND2 is breaking for ~ 90 minutes some times of the day and returning back without intervention. The breaking occur at times when the backup file is larger (after reindexing, etc). I can see the message below logged on the COPY job: *** Error: The specified network name is no longer available The copy agent was breaking dozens times a day only to STAND2 server, and after the changes below "only" breaks ~ two times a day: The frequency of the backup job was changed from 5 minutes to 10 minutes. Instead of backing up the 4 databases to the same folder, the log backups are now saved on separated folders for each database. The backup job doesn't run 24hs now, and only for 14 hours a day, when people are working on the database. I configured the SQL Server instances on the three servers to limit the memory, leaving more memory to the OS. Now I don't know what to do. Any help will be much appreciated! Thanks!

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• Copy one db diagram from one db to another on different servers? (Same db)

  - by sah302

  I used the copy database wizard to copy my database from our test server to our production server, the database copied everything fine except for the diagram. Okay no problem, first I make sure the target database on production has the support objects created to use database diagraming. Then I select to import data from the other database and chose the dbo.sysdiagrams.Go through with the rest of the import data wizard, but then I get the following error: Validating (Error) Messages Error 0xc0202049: Data Flow Task: Failure inserting into the read-only column "diagram_id". (SQL Server Import and Export Wizard) Error 0xc0202045: Data Flow Task: Column metadata validation failed. (SQL Server Import and Export Wizard) Error 0xc004706b: Data Flow Task: "component "Destination - sysdiagrams" (31)" failed validation and returned validation status "VS_ISBROKEN". (SQL Server Import and Export Wizard) Error 0xc004700c: Data Flow Task: One or more component failed validation. (SQL Server Import and Export Wizard) Error 0xc0024107: Data Flow Task: There were errors during task validation. (SQL Server Import and Export Wizard) So apparently it didn't like that. What's the problem? I am pretty beginner in SQL Server and only do stuff via the GUI usually so am not sure what to do at this point. The databases are the same, but on different servers. Thanks!

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• Backing up large network (~200 clients) -- Enough Bandwidth?

  - by mtkoan

  My company wants to institute a backup plan for all of the clients on our network, which is about 200. We back up our servers and SQL databases regularly, but its been our policy to not backup individuals. What is most critical for people is their Documents and PST files in Outlook. PST files can be very large, and most people's are ~1-1.5 GB around here. So with PST files alone that is 200-300 GB of data needing to be transferred daily to a sever for backup. Or compressing first, then transferring, but many of the machines are VERY old and such a task would grind their computer to a halt. Isn't this the reason networks use things like VMware -- to reduce network traffic and streamline backups? Or is this only to reduce hardware costs? Would this much network traffic everyday drastically slow down our network? Enough to the point we'd have to mandate it to be done at night only? Or could we stagger then through out the day? Really appreciate any input, thank you.

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• VMWare Setup with 2 Servers and a DAS (DELL MD3220)

  - by Kumala

  I am planning to use a VMWare based setup consisting of two VMWare servers (2 CPU, 256GB Memory) and a DAS (DELL MD3220 with 24x900GB disks). The virtual machines will be half running MS SQL databases (Application, Sharepoint, BI) and the other half of the VM will be file services, IIS. To enhance the capacity of the storage, we'll be adding a MD1220 enclosure with another 24x900GB to the MD3220. Both DAS will have 2 controllers. Our current measured IOPS is 1000 IOPS average, 7000 IOPS peak (those happen maybe twice per hour). We are in the planning phase now and are looking at the proper setup of the disks. The intention is to setup up both DAS one of the DAS with RAID 10 only and the other DAS with RAID 5. That will allow us to put the applications on the DAS that supports the application performance needs best. Question is how best to partition the two DASs to get best possible IOPS/MBps, each DAS will have to have 2 hot spares? For the RAID 5 Setup: Generally speaking, would it be better to have one single disk group across all 22 disks (24 - 2 hot spares) with both controllers assigned to the one disk group or is it better to have 2 disk groups each 11 disks, assigned to one of the two controllers? Same question for the RAID 10 setup: The plan is: 2 disks for logs (Raid 1), 2 Hotspare and 20 disks for RAID 10. Option 1: 5 * 4 disks (RAID 10), with two groups assigned to 1 controller and 3 groups to the other controller Option 2: One large RAID 10 across all the disks and have both controllers assigned to the same group? I would assume that there is no right or wrong, but it all depends very much on the specific application behaviour, so I am looking for some general ideas what the pros and cons are of the different options. IF there are other meaningful options, feel free to propose them.

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• Migrate openldap users and groups

  - by user53864

  I have an OpenLDAP server running on one of my ubuntu 8.10 servers. I used command-line only for OpenLdap installation and some basic configurations, everything else I'll configure with the Webmin gui tool. I'm trying to migrate to ubuntu 10.04 and I was able to migrate all other servies, application and databases but not the ldap. I'm an ldap beginner: I have installed OpenLDAP server and client on ubuntu 10.04 server using the link and used the following command to export and import ldap users and groups To export from 8.10 server slapcat > ldap.ldif To import to 10.04 server Stop ldap and slapadd -l ldap.ldif and Start ldap Then I accessed Webmin and checked in Ldap users and groups and I could see all the users and groups of my old ldap server.Whenever I create an ldap user from the webmin(in 8.10 or 10.04) a unix user is also created with the home directory under /home. But the imported users in 10.04 from 8.10 are not present as a unix user(/etc/passwd). How could I make the ldap users available as a unix user, is there any perfect way to export and import?. I also wanted to check the ldap users from the terminal that if password is exported properly but I don't know how to access the ldap users which are not available as unix users. On 8.10, I just use su - ldapuser and it is not working in the 10.04 as unix users are not created for the exported ldap users. If every thing works fine then the CVS works as it is using ldap authentication. Anybody could help me?

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• Redirect 301 fails with a path as destination

  - by Martijn Heemels

  I'm using a large number of Redirect 301's which are suddenly failing on a new webserver. We're in pre-production tests on the new webserver, prior to migrating the sites, but some sites are failing with 500 Internal Server Error. The content, both databases and files, are mirrored from the old to the new server, so we can test if all sites work properly. I traced this problem to mod_alias' Redirect statement, which is used from .htaccess to redirect visitors and search engines from old content to new pages. Apparently the Apache server requires the destination to be a full url, including protocol and hostname. Redirect 301 /directory/ /target/ # Not Valid Redirect 301 /main.html / # Not Valid Redirect 301 /directory/ http://www.example.com/target/ # Valid Redirect 301 /main.html http://www.example.com/ # Valid This contradicts the Apache documentation for Apache 2.2, which states: The new URL should be an absolute URL beginning with a scheme and hostname, but a URL-path beginning with a slash may also be used, in which case the scheme and hostname of the current server will be added. Of course I verified that we're using Apache 2.2 on both the old and the new server. The old server is a Gentoo box with Apache 2.2.11, while the new one is a RHEL 5 box with Apache 2.2.3. The workaround would be to change all paths to full URL's, or to convert the statements to mod_rewrite rules, but I'd prefer the documented behaviour. What are your experiences?

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• What kind of server attacks should i be aware of nowadays

  - by Saif Bechan

  I am recently running a web server, and there is a lot of information online, but it can all be a little confusing. I recently opened my logwatch logs and saw that i get attacked a lot by all sorts of bots. Now I am interested in a list with things I definitely should be aware of nowadays, and possible ways to prevent them. I have read stories about server crashed by floods, crashed by email, and all sorts of crazy stuff. Thing I already did: I have recently blocked all my ports, except for the http and email ports. I disabled IPv6, this was giving me a lot of named errors I have turned on spam DNS blackhole lists to fight spam - sbl.spamhaus.org; - zen.spamhaus.org; - b.barracudacentral.org; I installed and configured mod_security2 on apache There is no remote access possible to my databases That is all i did so far, further I am not aware of any other threats. I want to know if the following things have to be protects. Can I be flooded by emails. How can i prevent this Can there be a break in or flood of my databses Are there things like http floods or whatever Are there any other things i should know before i go public with my server I also want to know if there is some kind of checklist with must-have security protections. I know the OWASP list for writing good web applications, is there something for configuring a server.

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• Tools to manage sql 2008 database mirroring?

  - by lemkepf

  We are going to be moving about 20 databases that live on a single instance of sql 2000 to a sql 2008 r2 environment with database mirroring. What I'm looking for is a tool or scripts that will help me manage the conversion and management of those 20db's onto this new mirrored environment easily. There are many steps in setting each DB up and I want to automate as much as possible. Edit: Here are the steps I've been doing manually: Create the same username/passwords from the old sql 2000 server onto new sql 2008 server. Then sync those users/passwords onto the other sql 2008 server with the same SSID's so when we do the db backup and restore they match up. Take a backup of each sql 2000 db's. Copy them to server A. Restore the backup to server A. Backup from server a, copy to server b, restore there. Run the mirror "configure security" wizard. Start mirroring. I've love to be able to script this out or have a tool that does it for me. Thanks! Paul

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