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• Make a drive from one machine appear as a physical disk in another machine.

  - by Roberto Sebestyen

  I want to take a physical disk (or part of a disk) in one machine (call it machine-A) and I want to make it available in another machine (machine-B). But I don't want to map a network drive. I want it to appear in machine-B as a physical drive. Even though it is not a physical drive. The reason I want to do this is i want the ability to create shares in machine-B on that drive. Since I cannot do that on mapped drives, I need to use some utility that fools machine-B to think that it is a physical drive, and treat it as such. Both of these machines are windows server 2003. I heard about NFS, It sounds like what could be the solution to my problem. But isn't that a Linux/Unix protocol? What tools can I use to make this happen? Are there any open source solutions? I don't care what the solution is, as long as it achieves the end result, preferably open source solution though. Thanks for reading guys and gals!

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• How can I inject clips [ads] in a playlist every x minutes (even if previous clip is not over)

  - by azera

  Sorry for the title, I find it quite hard to describe what I want to do in a single sentence We have a few TV here linked to our computer, which we use to display clips about what we do in our sport center, what you should do to stay in good form ect ... It's running non stop, actually though vlc + playlist. Those main clips are 1-2 hours long and we have about 20 of them looping randomly all day. We would like to inject ads for some of our sponsiored products every now and then during the playlist, like say one ad every 15 minute. Does any one know how we can do that, while keeping the main clip random order ? I thought about encoding the whole thing as a single movie with ads inserted, but then it's not random. So we can put the ads in the playlist itself right ? Except clips are several hours long and we want that more often than that. Cutting the main clips in several pieces seems to work but that kind of sucks as new clips are made every month. If any one has an idea, thanks a lot

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• Joomla performance problems on AWS

  - by Bobby Jack

  I'm running a site on AWS with the following setup: Single m1.small instance (web server) Single RDS m1.small db Joomla 1.5 Generally, the site is performant, but is fairly low-traffic - say around 50-100 visits / hour. However, at peak time, we see about double that traffic. During peak time, pretty much every day: CPU usage on the web server slowly climbs to 100% CPU usage on the RDS server climbs quite quickly to about 30%, from an average of about 15 Database connections shoot up to about 140, from a normal average of about 2 or 3 The site is then occasionally unreachable, certainly according to pingdom monitoring. Does anyone recognise this behaviour? Can you point me in the right direction to begin investigating? Of course, RDS makes it difficult to do things like slow query logging, so I've started by regularly dumping the mysql process list into a file to see if there's anything I can spot there, but it would be good to have something more concrete to investigate. UPDATE At least, can someone confirm that I'm definitely right in saying that the level of traffic implies the problem must be a specific type of query taking way longer than it should to execute? This would happen if a table gets locked, and many queries need to write to it, right? For this very reason, I've already changed the __session table type to InnoDB.

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• when to upgrade server to include more cores, versus more processors, versus additional server?

  - by gkdsp

  The server hosting market is separated into single, double, qual, etc., processors, where each processor has several cores, or CPUs. My company will offer a Linux-based web application that relies on an Apache web server and a middle tier for business logic. The middle tier is used to crunch math, and return result to a client. Many clients may access the application simultaneously. The company will start with one processor having 4 cores. I'm trying to understand how the app uses the cores and then how to scale the application as business grows, in terms of servers/processors/cores. For example, I'd assume initially one core would be used for Apache, and the other 3 used to process client's requests for math crunching... Question 1: does that mean, with the 3 cores available, I can handle 3 separate client requests simultaneously (e.g. 1 for each of 3 cores)? I mean, except for the shared RAM, is this effectively like having 3 individual machines (from pt of view or processing client requests simulaneously)? Or, only one client's request may be processed at any one time, but that client's request is divided up into up to 3 cores depending on the type of process running that does the math crunching and whether or not it can take advantage of multi threading (so the # of cores impacts how fast any one client request completes)? I'm confused about what the cores mean to the application here. Question 2: As the business grows and more client requests need to be processed, should the server be upgraded to (A) a new machine with more cores, (B) a new machine with two processors, 4 cores each, or (C) keep the original server and add another server with a single processor? Which route provides the most efficient way to scale the application, in terms of processing more client requests per time interval? Is the choice, for example, limited by RAM (when you need more RAM than box can handle it's time to add another server), or something else? Question 3: Is the total number of client requests processed simultaneously equal to the number of cores times the number of servers (minus the one core for Apache)?

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• Formal separation marker of syslog events?

  - by Server Horror

  I've been looking at RFC5424 to find the formally specified marker that will end a syslog event. Unfortunately I couldn't find it. So If I wanted to implement some small syslog server that reacts on certain messages what is the marker that ends a message (yes commonly an event is a single line, but I just couldn't find it in the specification) Clarification: I call it event because I associate a message with a single line. An event could possibly be some thing like Type: foo Source: webservers whereas a message to me is this: Type: foo Source: webservers http://tools.ietf.org/html/rfc5424#section-6 defines: SYSLOG-MSG = HEADER SP STRUCTURED-DATA [SP MSG] neither STRUCTURED-DATA nor MSG tell me how these fields end. Especially MSG is defined as as MSG-ANY / MSG-UTF8 which expands to virtually anything. There's nothing that says a newline marks the end (or an 8 or an a for that matter). Given the example messages (section 6.5): This is one valid message, or 2 valid messages depending on wether you say that a HEADER element must never occur in any MSG element: literal whitespace <34>1 2003-10-11T22:14:15.003Z mymachine.example.com su - ID47 - <34>1 2003-10-11T22:14:15.003Z mymachine.example.com su - ID47 | is this an end marker? \t stands for a tab <34>1 2003-10-11T22:14:15.003Z mymachine.example.com su - ID47 -\t<34>1 2003-10-11T22:14:15.003Z mymachine.example.com su - ID47 | is this an end marker? \n stands for a newline <34>1 2003-10-11T22:14:15.003Z mymachine.example.com su - ID47 -\n<34>1 2003-10-11T22:14:15.003Z mymachine.example.com su - ID47 | is this an end marker? Either I'm misreading the RFC or there just isn't any mention. The sizes specified in the RFC just say what the minimum length is expected that I can work with...

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• Linux CentOS strange memory readings

  - by user2008937

  I am actually a young junior sys admin. I have a question - i am trying to understand how linux deals with memory... while playing around different monitoring programs I found some strange thing. When I run top on my laptop it shows me that FIREFOX process with pid 8778 takes 18,3% of memory (%MEM column). grep "MemTotal" /proc/meminfo Above command give me 1848336kb/1024 = 1805megs of memory (its ok - i have 2 gigs of ram). So if the firefox process takes 18,3% of MEM(according to tops %MEM column) then it takes 0.183 * 1805 which is approximately 325mb of memory. Quite a lot as for firefox... But well, in Linux there are lots of shared libraries that programs commonly uses (like famous libc). And those libraries are added to memory utilization of every process that uses it in the system, despite they are actually reading same file(single object in memory). So top may show too big mem utilization because of those shared libraries. Well, it is time to use PMAP which should show us the real mem utilization of process. But.. pmap -d $(pidof firefox) mapped: 983460K writeable/private: 757164K shared: 66416K so pmap shows that 983460/1024=993MB of memory is mapped to this process. It is in fact much bigger than mem utilization showed by top. Whats wrong here? How pmap can show more than top? even when top adds also the shared libraries (which in fact are single objects in memory) for each process that uses it? and pmap omits it? Regards Krzysztof

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• deploy git project and permission issue

  - by nixer

  I have project hosted with gitolite on my own server, and I would like to deploy the whole project from gitolite bare repository to apache accessible place, by post-receive hook. I have next hook content echo "starting deploy..." WWW_ROOT="/var/www_virt.hosting/domain_name/htdocs/" GIT_WORK_TREE=$WWW_ROOT git checkout -f exec chmod -R 750 $WWW_ROOT exec chown -R www-data:www-data $WWW_ROOT echo "finished" hook can't be finished without any error message. chmod: changing permissions of `/var/www_virt.hosting/domain_name/file_name': Operation not permitted means that git has no enough right to make it. The git source path is /var/lib/gitolite/project.git/, which is owned by gitolite:gitolite And with this permissions redmine (been working under www-data user) can't achieve git repository to fetch all changes The whole project should be placed here: /var/www_virt.hosting/domain_name/htdocs/, which is owned by www-data:www-data. What changes I should do, to work properly post-receive hook in git, and redmine with repository ? what I did, is: # id www-data uid=33(www-data) gid=33(www-data) groups=33(www-data),119(gitolite) # id gitolite uid=110(gitolite) gid=119(gitolite) groups=119(gitolite),33(www-data) does not helped. I want to have no any problem to work apache (to view project), redmine to read source files for project (under git) and git (doing deploy to www-data accessible path) what should I do ?

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• What are the typical methods used to scale up/out email storage servers?

  - by nareshov

  Hi, What I've tried: I have two email storage architectures. Old and new. Old: courier-imapds on several (18+) 1TB-storage servers. If one of them show signs of running out of disk space, we migrate a few email accounts to another server. the servers don't have replicas. no backups either. New: dovecot2 on a single huge server with 16TB (SATA) storage and a few SSDs we store fresh mails on the SSDs and run a doveadm purge to move mails older than a day to the SATA disks there is an identical server which has a max-15min-old rsync backup from the primary server higher-ups/management wanted to pack in as much storage as possible per server in order to minimise the cost of SSDs per server the rsync'ing is done because GlusterFS wasn't replicating well under that high small/random-IO. scaling out was expected to be done with provisioning another pair of such huge servers on facing disk-crunch issues like in the old architecture, manual moving of email accounts would be done. Concerns/doubts: I'm not convinced with the synchronously-replicated filesystem idea works well for heavy random/small-IO. GlusterFS isn't working for us yet, I'm not sure if there's another filesystem out there for this use case. The idea was to keep identical pairs and use DNS round-robin for email delivery and IMAP/POP3 access. And if one the servers went down for whatever reasons (planned/unplanned), we'd move the IP to the other server in the pair. In filesystems like Lustre, I get the advantage of a single namespace whereby I do not have to worry about manually migrating accounts around and updating MAILHOME paths and other metadata/data. Questions: What are the typical methods used to scale up/out with the traditional software (courier-imapd / dovecot)? Do traditional software that store on a locally mounted filesystem pose a roadblock to scale out with minimal "problems"? Does one have to re-write (parts of) these to work with an object-storage of some sort - such as OpenStack object storage?

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• iptables: How to combine DNAT and SNAT to use a secondary IP address?

  - by Que_273

  There are lots of questions on here about iptables DNAT/SNAT setups but I haven't found one that solves my current problem. I have services bound to the IP address of eth0 (e.g. 192.168.0.20) and I also have a IP address on eth0:0 (192.168.0.40) which is shared with another server. Only one server is active, so this alias interface comes and goes depending on which server is active. In order to get traffic accepted by the service a DNAT rule is used to change the destination IP. iptables -t nat -A PREROUTING -d 192.168.0.40 -p udp --dport 7100 -j DNAT --to-destination 192.168.0.20 I also wish all outbound traffic from this service to appear to come from the shared IP, so that return responses will work in the event of a active-standby failover. iptables -t nat -A POSTROUTING -p udp --sport 7100 -j SNAT --to-source 192.168.0.40 My problem is that the SNAT rule is not always run. Inbound traffic causes a connection tracking entry like this. [root]# conntrack -L -p udp udp 17 170 src=192.168.0.185 dst=192.168.0.40 sport=7100 dport=7100 src=192.168.0.20 dst=192.168.0.185 sport=7100 dport=7100 [ASSURED] mark=0 secmark=0 use=2 which means the POSTROUTING chain is not run and outbound traffic leaves with the real IP address as the source. I am thinking I can set up a NOTRACK rule in the raw table to prevent conntracking for this port number, but is there a better or more efficient way to make this work? Edit - Alternative question: Is there a way (in CentOS/Linux) to have an interface that can be bound to but not used, such that it can be attached to the network or detached when a shared IP address is swapped between servers?

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• How do I connect remotely to SQL Server from Windows client?

  - by humble_coder

  Hi All, Having a bit of an issue connecting to SQL SERVER remotely from Windows. I've verified that all of my settings are correct via SQL SERVER MANAGEMENT STUDIO EXPRESS and SQL SERVER CONFIGURATION MANAGER. I can connect remotely using ODBC drivers from other OSes (e.g. OS X, Linux, etc). However, when I connect with the same credentials from a remote Windows machine using "SQL SERVER" as the driver I am told that the system cannot connect. I've tried creating an ODBC Data Source and I get the same error: Connection failed: SQLState: '01000' SQL Server Error: 14 [Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]ConnectionOpen(InvalidInstance()). Connection failed: SQLState: '08001' SQL Server Error: 14 [Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]Invalid Connection From the non-windows machines I can use the IP address of the SQL Server just fine. However, on the remote Windows machine, neither IP address nor named instance works. FYI, I can create an ODBC Data Source using the named instance on the machine actually running the SQL Server (but this is, of course, nothing special -- just proof that it isn't completely hosed). One interesting note: If I use SQL STUDIO 2005 from a Windows client machine, I can use the IP address to connect remotely. Still, the whole reason I bring this up is because I need to use a software package I've written to connect to SQL Server remotely from Windows machines as well. Previously the solution was only needed to xfer data from SQL Server into a PostGRES or MySQL database on non-Windows machines (due to DBA preference). However, now they also want to move the data from the legacy software to MySQL even on Windows. Any assistance would be most appreciated. Feel free to provide a full example connection string. Best

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• S3sync not working

  - by user57833

  Hello, I managed to get s3sync to upload my test folder to Amazon S3 and can see it in the MWS Managment Console. Downloading the data back to a test folder results in the following error message: root@mybucketname:/var/s3sync# ./week_download.sh s3Prefix backups/weekly localPrefix /var/s3sync/testdown/weekly s3TreeRecurse mybucketname backups/weekly Creating new connection Trying command list_bucket mybucketname prefix backups/weekly max-keys 200 delimiter / with 100 retries le ft Response code: 200 prefix found: / s3TreeRecurse mybucketname backups/weekly / Trying command list_bucket mybucketname prefix backups/weekly/ max-keys 200 delimiter / with 100 retries l eft Response code: 200 S3 item backups/weekly/ s3 node object init. Name: Path:backups/weekly Size:0 Tag:d41d8cd98f00b204e9800998ecf8427e Date:Fri O ct 29 14:21:53 UTC 2010 local node object init. Name: Path:/var/s3sync/testdown/weekly/ Size: Tag: Date: source: dest: Update node s3sync.rb:638:in initialize': No such file or directory - /var/s3sync/testdown/weekly/.s3syncTemp (E rrno::ENOENT) from s3sync.rb:638:inopen' from s3sync.rb:638:in updateFrom' from s3sync.rb:393:inmain' from s3sync.rb:735 I am using the following download script: !/bin/bash script to download local directory upto s3 cd /var/s3sync/ export AWS_ACCESS_KEY_ID=nothing to see here export AWS_SECRET_ACCESS_KEY=nothing to see here export SSL_CERT_DIR=/var/s3sync/certs ruby s3sync.rb -r -v -d --progress --make-dirs mybucket:backups/weekly /var/s3sync/testdown copy and modify line above for each additional folder to be synced Any idea's? Does the download script need to download to the source of Amazon S3 i.e testup folder? Was hoping on the instance of a complete failure and the original folders won't exist that it would just download everything from me. Note: changed my bucket names to "mybucketname" so that it is not public!

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• How to start MSSQL Server with corrupt model db

  - by Jordan McGuigan

  After moving some databases around (restoring, deleting, etc) we experienced an issue creating new databases. Specifically, When trying to create a new database MSSQL Server it failed because the "The database 'model' is marked RESTORING and is in a state that does not allow recovery to be run". As some online solutions suggested, we tried to Start and Stop the MSSQL Service. Service would not restart because "Could not create tempdb. You may not have enough disk space available. Free additional disk space by deleting other files on the tempdb drive" (FYI: the drive has 100gb of free space). Tried restarting the machine the MSSQL Server is running on. When the server came back online, we received the same error. We have tried deleting tempdb.mdf and restoring the modeldb from the templates folder, but neither of these solved the issue. We are unable to connect to the database, even in single user mode. Many of the online solutions have us running SQL commands against the server, but we are unable to connect (even in single user mode) to the DB to run commands against the server. Specific error messages: Database 'model' cannot be opened. It is in the middle of a restore. (Microsoft SQL Server, Error: 927) The SQL Server (MSSQLSERVER) service is starting. The SQL Server (MSSQLSERVER) service could not be started. A service specific error occurred: 1814. We need the server up and running again ASAP.

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• TCP/UDP hole punching from and to the same NAT network

  - by Luc

  I was wondering if tcp/udp hole punching would still work when you are in the same network (behind a NAT), and what the packet's path would be. What happens when using hole punching on the same network, is that it will send a packet out with the same destination and source address. Only the source and destination port would differ. I imagine a router with NAT loopback enabled will handle this as it should, but how about other routers? Would they drop the packet, or would a router (the first?) from the ISP bounce the packet back after which it gets handled okay? I'm wondering because I was thinking about using this technique to circumvent a block between peers in a network (like a school network where clients can only access the internet, but any contact with each other is blocked). The only other option is to use a man in the middle as proxy (tunnel?). The disadvantage of this is that you have to have a server with significantly more bandwidth than one that would only do hole punching. Also the latency would increase significantly.

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• Splitting an HTTP request into multiple byte-range requests

  - by redpola

  I have arrived at the unusual situation of having two completely independent Internet connections to my home. This has the advantage of redundancy etc but the drawback that both connections max out at about 6Mb/s. So one individual outbound http request is directed by my "intelligent gateway" (TP-LINK ER6120) out over one or the other connection for its lifetime. This works fine over complex web pages and utilises both external connects fine. However, single-http-request downloads are limited to the maximum rate of one of the two connections. So I'm thinking, surely I can setup some kind of proxy server to direct all my http requests to. For each incoming http request, the proxy server will issue multiple byte-range requests for the desired data and manage the reassembly and delivery of that data to the client's request. I can see this has some overhead, and also some edge cases where there will be blocking problems waiting for data. I also imagine webmasters of single-servers would rather I didn't hit them with 8 byte-range requests instead of one request. How can I achieve this http request deconstruct/reconstruction? Or am I just barking mad?

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• Small maximum number of connections on a Linux router

  - by Eugene

  I have a Linux box acting as a router with no iptables or other firewall and no networking applications running on it, just pure router. I've put it in a test environment that generates many TCP connections, each having unique source and destination IP, and those connections go through this router. I'm observing that number of connections successfully created rise to approximately 500 and then no more connections can be created for several minutes, then another 100 connections can be created and there is another pause, and so on. If 10 connections for each source-destination pair are created, then maximum numbers go about 10 times up, so the problem is probably with many connections from different IPs. As traffic is simply routed, it doesn't have to do with number of file descriptors, iptables connection tracking and other things often proposed to check in similar cases. The box has plenty of free RAM and CPU, both NICs are gigabit. The kernel is 2.6.32. I've already tried increasing net.core.*mem_max, net.core.netdev_max_backlog and txqueuelen on both NICs, with completely no effect. What else should I check ? Is there some rate-limit in the kernel itself ?

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• What are the advantages of registered memory?

  - by odd parity

  I'm browsing for a few low-end servers for a startup and I'm a bit confused about the different memory types. The advantage of ECC is clear - single-bit error correction. When it comes to registered memory it seems more vague, especially in systems that support both registered and unbuffered memory. A Google search mostly finds copies of the Wikipedia article, which states that registered memory chips "...place less electrical load on the memory controller and allow single systems to remain stable with more memory modules than they would have otherwise". However I can't find any quantification of this. What I'm wondering about is: Is registered memory an improvement over unbuffered when it comes to soft error rate, or is it purely about the maximum number of modules supported? If yes, at what point (amount of modules or GB of memory) do these improvements start to become noticeable? For a specific example, the HP ProLiant DL 120 G6 server manual states that maximum supported memory configuration is 16 GB unbuffered (4x4GB) or 12 GB registered (6x2GB). In this case I'd rather have the extra 4GB of memory if the reliability difference is negligible.

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• Is it possible to trace someone using Google during an online exam?

  - by George

  I happen to be a professor at a reputed college. I want to design an online exam for over 1000 students via around 50 computers right after the vacation ends. Now the problem is that I have heard that many students use Google on a different tab to find answers when no invigilator is around. I want to know if there is a way to backtrace it after the exams via some kind of history or any other possible way. In our university there is a standard system. I am not good with computers but I will try to explain. Each computer uses mozilla to connect to a server centrally located via an IP. The students open it and enter a unique ID and password to start the exams. Many questions are jumbled and different groups of students give exam in a different time slot. Is there any way to trace it since I want to set an example for students so they won't cheat and give exams in an honest way. Additional details: Since the number of computers are less than the number of students, more than 10 students are going to use a single computer on a single day over a period of 10 hours. After this, if I check the history (and let's say someone even forgot to delete the history and I see it), will I able to figure out who among the 10 has done it? Moreover, is it even practical and feasible?

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• Wildcard subdomain setup ... want to change host IP throws off client A records... what to do...

  - by Joe

  Here is the current set up (in a nutshell). The site is set up with a wildcard subdomain, so *.website.com is accessible. Clients can then domain map their own domains with an A record to the server IP address and it will translate the to appropriate *.website.com with re directions and env variables in htaccess. Everything is working perfect... but now comes the problem. The site has grown larger than a single DQC Xeon server can handle at peak times. Looking at cloud options seems tempting, but clients are pointing their domains to a single IP address with the A record (our server). Now, this was probably bad planing from the start, but the question is, if this was to be done today, how would we set it up so that clients use a CNAME perhaps to point their domains to our server rather than an A record. And, if that is not possible for the root domain, how can we then use multiple IP addresses on our side to translate the incoming http request? Complex enough? Hope I've explained it well!

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• Why Are SPF Records Failing?

  - by robobobobo

  Ok I've been going through various different sites, resources and topics here trying to figure out what is wrong with my SPF records but no matter what I do they don't seem to pass. Here's what I have "v=spf1 +a +mx +ip4:217.78.0.92 +ip4:217.78.0.95 -all" I've tried multiple different tools to check my spf records, some give me a pass, some don't. But I can't send mail to certain google app accounts, they just bounce back all the time which is very annoying. Anyone got any ideas? I have noticed that the source IP address is not the IPV4 addresses I've defined, but Cpanel wouldn't let me add that address into it.. And here's the result of tests I'm getting back from port25.com. I'm running WHM by the way and have enabled spf and dkim. Summary of Results SPF check: fail DomainKeys check: neutral DKIM check: pass Sender-ID check: fail SpamAssassin check: ham Details: HELO hostname: server1.viralbamboo.com Source IP: 2a01:258:f000:6:216:3eff:fe87:9379 mail-from: ###@viralbamboo.com SPF check details: Result: fail (not permitted) ID(s) verified: smtp.mailfrom=###@viralbamboo.com DNS record(s): viralbamboo.com. SPF (no records) viralbamboo.com. 13180 IN TXT "v=spf1 +a +mx +ip4:217.78.0.92 +ip4:217.78.0.95 -all" viralbamboo.com. AAAA (no records) viralbamboo.com. 13180 IN MX 0 viralbamboo.com. viralbamboo.com. AAAA (no records) DomainKeys check details: Result: neutral (message not signed) ID(s) verified: header.From=###@viralbamboo.com DNS record(s): DKIM check details: Result: pass (matches From: ###@viralbamboo.com). ID(s) verified: header.d=viralbamboo.com Canonicalized Headers: content-type:multipart/alternative;'20'boundary="4783D1BE-5685-41CF-B91B-1F15E91DD1E3"'0D''0A' date:Mon,'20'1'20'Jul'20'2013'20'21:30:47'20'+0000'0D''0A' subject:=?utf-8?Q?test?='0D''0A' to:"[email protected]?="'20''0D''0A' from:=?utf-8?Q?Rob_Boland_-_Viralbamboo?='20'<###@viralbamboo.com'0D''0A' mime-version:1.0'0D''0A' dkim-signature:v=1;'20'a=rsa-sha256;'20'q=dns/txt;'20'c=relaxed/relaxed;'20'd=viralbamboo.com;'20's=default;'20'h=Content-Type:Date:Subject:To:From:MIME-Version;'20'bh=CJMO7HYeyNVGvxttf/JspIMoLUiWNE6nlQUg5WjTGZQ=;'20'b=;

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• Exchange 2003 inbound routing issue

  - by user565712

  Just recently we started experiencing inbound routing issues. Email adddressed to [email protected] is intermittantly translated to [email protected]. This is happening for several users and, as stated, is intermittant. I don't know where to start looking for the solution. Is this an Exchange issue? A DNS issue? We have a single Exchange server inside our network with an FQDN of server.domain.local with a single SMTP Virtual Server. The Advanced properties of the Delivery tab of the Virt Server has an empty Masquerade Domain textbox and the value for the FDQN text-box is set to the domain itself, domain.com. The DNS record for domain.com is a CNAME entry referencing www.domain.com. Is this somehow related to the problem? I checked the headers of the inbound messages that generated NDRs as a result of being sent to [email protected] and nowhere in the header is www.domain.com mentioned. To make my life even more difficult, we use Postini as a third-party SPAM filtering service. Our MX records point to the Postini servers and Postini delivers the messages to our server. Perhaps it is Postini that is mucking things up? sigh I'm having trouble with this one and the intermittent aspect is making it that much more difficult for me. Any ideas?

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• Constant crashes in windows 7 64bit when playing games

  - by yx.

  I've tried everything I can possibly think of in trying to fix this problem and I'm totally out of ideas, so any help would be appreciated: The problem: whenever I fire up a game, it works for a short while with no problems and then it would crash. Either its a hard crash, forcing me to reboot, or windows would report that the display driver has stopped working and recovered. Here is a list of things I've already tried: Drivers - tried the latest drivers (catalyst 9.12) as well as the stock drivers that came with the video card. Also have the latest BIOS/chipset Memtest - Ran Memtest86+ overnight, had no problems, the windows diagnostic tool also does not find any problems. Overheating - Video card/cpu temperatures are well below peak (42 and 31 Celsius receptively) PSU Voltage - CPUID shows that the voltage levels are all above what they should be. The PSU itself is only roughly 16 months old and is a good model. HDD - No errors when checked GPU - Brand new (replaced previous card since I thought it was the problem, apparently not) Overclocking - Everything is at stock levels, memory voltage is set to manufacturer's standard Specs: Motherboard: ASUS P5Q Pro CPU: Core 2 Duo E8400 3.0 ghz OS: Windows 7 home premium 64 bit Memory: Mushkin Enhanced 4GB DDR2 GPU: Sapphire HD 5850 1GB PSU: SeaSonic M12 600W ATX12V DirectX: DX11 Event Viewer after a crash always has these logged: A fatal hardware error has occurred. Reported by component: Processor Core Error Source: Machine Check Exception Error Type: Bus/Interconnect Error Processor ID: 1 The details view of this entry contains further information. A fatal hardware error has occurred. Reported by component: Processor Core Error Source: Machine Check Exception Error Type: Bus/Interconnect Error Processor ID: 0 The details view of this entry contains further information. A previous card that I had (4850x2) also had these errors, so I changed video cards, but the same thing is happening.

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• Service redirection on same network

  - by Unode

  I have a network on which I run multiple servers each dedicated to a given service. Because most services run on distinct ports I'm currently looking for a way of unifying "all" services into a single "proxy" machine. The idea is to abstract which machine is being accessed but still allow direct connection if needed/requested. This "proxy" machine has only one network interface which is part of the same network as all the other service providing machines. I've looked into Routing and NAT but I've so far failed to figure out how to make it work. I tried to achieve this using shorewall but couldn't find clear examples. However I'm not entirely sure this is the best/simplest strategy. With that said, what would be the best way of achieving this result? Example case: Proxy IP - Listening port - Send requests to 192.168.0.50 80 192.168.0.1:80 " 22 192.168.0.2:2222 " 3306 192.168.0.3:3000 " 5432 192.168.0.4:5432 " 5222 192.168.0.5:5222 PS: I'm not concerned with the single-point-of-failure nature of the proxy. Thanks

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• Auto-focus xdvi after running viewdvi in Emacs with AUCTeX.

  - by D Connors

  I've been using emacs with AUCTeX mode to edit my latex documents for a few days now, but there's something that's really bugging me. As it should be, whenever I do C-c C-c RET it compiles the file, and if repeat the command it views the output in xdvi. It's also set to the mini-mode TeX-source-specials-mode, so instead of opening a new window in xdvi it only reloads the window that's already open, brings it to the front, and sends me to wherever the pointer was in emacs (forward search). Now here's the problem: Even though the xdvi window is brought to the front, it's not focused. Instead, the emacs windows stays with focus (and that's where any keyboard input goes). And I keep forgetting about that, which leads me to accidentally editing the source file while trying to navigate in xdvi. Not to mention I'm forced to alt-tab in order to focus xdvi, and alt-tab twice if I just want to get back to emacs. Is there a way around this problem? I just want xdvi to be focused whenever I run the view command from emacs.

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• How to route outbound traffic to specific domain "XYZ.org" via a specific NIC or public/static IP?

  - by user139943

  Within the next week or so, I'll be setting up an AT&T U-verse modem with 5 usable static public IP addresses. I plan to register a domain name to 1 of the 5 static IPs (remaining 4 unregistered), and run a website from a single server setup in my home LAN. I'll skip the long winded reason why, but I need to somehow route outbound traffic (originating from my server) destined for one public domain (i.e. http://www.sample.org) through one of the UNREGISTERED static IP addresses ONLY. Basically, I want this public domain to see connections coming from an IP address and not my domain name. If it makes it easier, this can apply to all outbound traffic from my server as long as it doesn't impact users browsing my website! Inbound connections should go through the domain name / registered public IP. Can I accomplish this with my single server with one or multiple NICs? Do I need multiple servers and set one up as a proxy? Please help as my background is in software and not networking, and I don't think I can accomplish this at a software level (e.g. Java). Thanks.

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• Website and file/directory permissions

  - by mathiass

  I've been given a task to fix this one website. One of its issues is that on one page, the images have broken links - the images are not showing, and clicking on the image (i.e. direct link to the image file) results in a 403 (Forbidden) error. I am looking for some feedback on what could be the possible cause. The directory where the images are stored has the following permissions: drwxrws--- www "group" 10240 Aug 2008 "image directory name" I had to hide the names. I checked the page source code, and everything seems to be in place. The rest of the site, and other images outside that image directory are showing fine. I was told that recently there have been some changes to the server. I'm trying to assume that there is no fault in the source code, and the permissions are - or used to be - correct (since the site has been working before, and no recent changes to the site itself have been made). My only thoughts at the moment is that either: a) the directory permission should be: drwxrws--x (executable) for the other users, or b) there is a change in the server settings that I don't know of. Is there anything else I should check?

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