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• Why does Exim puts emails on hold if there are frozen messages in the queue?

  - by user51932

  I've a CentOS with CPanel server working as a SMTP server, which currently uses 20 different hostnames and IP addresses to deliver email for an email newsletter service. However, it's extremely slow in sending emails. It's sending like 10 emails per minute, which I check by running the "exim -bpc" command. What could be affecting this? One thing I'm supposing, is that there are frozen messages in the queue, which are slowing down the sending until they're sent out, and are putting new messages on hold. What are the most common reasons a message can get frozen? Also, would it be more efficient to use 20 different small VPSs to send out email rather than use one large VPS with the 20 different hostnames and IPs in it?

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• How to mount a iSCSI/SAN storage drive to a stable device name (one that can't change on re-connect)?

  - by jcalfee314

  We need stable device paths for our Twinstrata SAN drives. Many guides for setting up iSCSI connectors simply say to use a device path like /dev/sda or /dev/sdb. This is far from correct, I doubt that any setup exists that would be happy to have its device name suddenly change (from /dev/sda to /dev/sdb for example). The fix I found was to install multipath and start a multipathd on boot which then provides a stable mapping between the storage's WWID to a device path like this /dev/mapper/firebird_database. This is a method described in the CentOS/RedHat here: http://www.centos.org/docs/5/html/5.1/DM_Multipath/setup_procedure.html. This seems a little complicated though. We noticed that it is common to see UUIDs appear in fstab on new installs. So, the question is, why do we need an external program (multipathd) running to provide a stable device mount? Should there be a way to provide the WWID directly in /etc/fstab?

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• Computer only booting after POWER ON/OFF 10 times or more?

  - by Jan Gressmann

  Hi fellow geeks, recently my computer started to behave like an old car and won't start up anymore unless I flip the power switch repeatedly. What happens when I power it on: CPU fans spins briefly and very slowly, then it stops Same with GPU fan No BIOS beeps or HDD activity Screen stays black After turning it on and off for like 10 times, it'll eventually boot like normal and run smooth without any problems what-so-ever. But I'm worried it might eventually die completely. Anyone know the most common cause of this? Maybe I should just leave the computer powered on? :)

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• How to keep TightVNC client on Windows XP alive when connected to OS X?

  - by craibuc

  I'm using TightVNC on my Windows XP workstations to connect to a remote OS X box (10.5.x) using OS X's VNC support. I've noticed that the TightVNC will become unresponsive after a period of inactivity. Is this a common issue? Restarting TightVNC solves the problem, but can be a bit annoying. Is there a solution to this? I don't suppose copy & paste between the two systems can be made to work?

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• How can I get bash to perform tab-completion for my aliases?

  - by dstarh

  I have a bunch of bash completion scripts set up (mostly using bash-it and some manually setup). I also have a bunch of aliases setup for common tasks like gco for git checkout. Right now I can type git checkout dTab and develop is completed for me but when I type gco dTab it does not complete. I'm assuming this is because the completion script is completing on git and it fails to see gco. Is there a way to generically/programmatically get all of my completion scripts to work with my aliases? Not being able to complete when using the alias kind of defeats the purpose of the alias.

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• MapReduce job is hung after 1 of 5 reducers completed on single-node environment

  - by Marboni

  I have only one Data Node on my dev environment on EC2. I ran heavy MR job and in 6 hours noticed that 100% of mappers and 20% of reducers finished (1 of reducer shows 100% competition, other ones - 0%). Looks like job is hung between 2 reducer runs. I don't see any errors in log files. What it can be? P.S. Last logs of successfully finished reducer: 2012-11-09 11:29:21,576 INFO org.apache.hadoop.mapred.Task: Task:attempt_201211090523_0004_r_000000_0 is done. And is in the process of commiting 2012-11-09 11:29:22,692 INFO org.apache.hadoop.mapred.Task: Task attempt_201211090523_0004_r_000000_0 is allowed to commit now 2012-11-09 11:29:22,719 INFO org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter: Saved output of task 'attempt_201211090523_0004_r_000000_0' to /data/output/1352457275873/20121109-053433-common 2012-11-09 11:29:22,721 INFO org.apache.hadoop.mapred.Task: Task 'attempt_201211090523_0004_r_000000_0' done. 2012-11-09 11:29:22,725 INFO org.apache.hadoop.mapred.TaskLogsTruncater: Initializing logs' truncater with mapRetainSize=-1 and reduceRetainSize=-1

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• Bind dns server in Solaris 10 and win xp clients

  - by stevecomptech

  Hi, Added this in zone db file, i am running solaris 10 _ldap._tcp.mydomain.com. SRV 0 0 389 dc.mydomain.com. _kerberos._tcp.mydomain.com. SRV 0 0 88 dc.mydomain.com. _ldap._tcp.dc._msdcs.mydomain.com. SRV 0 0 389 dc.mydomain.com. _kerberos._tcp.dc._msdcs.mydomain.com. SRV 0 0 88 host.mydomain.com. Now i get this error when i try to join win xp to the domain The query was for the SRV record for _ldap._tcp.dc._msdcs.mydomain.com The following domain controllers were identified by the query: host.mydomain.com Common causes of this error include: Host (A) records that map the name of the domain controller to its IP addresses are missing or contain incorrect addresses. Domain controllers registered in DNS are not connected to the network or are not running. What do i need to change in order my win xp join the domain

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• Got root, now how should I configure my server?

  - by L. De Leo

  I've been a developer for years and by trade I had to know a little bit of server side configuration. But now I find myself needing to manage my own VPS instance (Amazon EC2) and I'm lost. I'd like to know what are the common ways to configure an Apache and MySQL server that is secure and efficient. For example right now I'm doing everything as root but I doubt that's the best way at all. My whole Apache is configured to serve 1 site when I'd like it to be able to serve multiple sites. Where do I start?

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• Restoring the Fonts folder by using a restore point

  - by ryalho

  I am an idiot. Who would have thought that installing 2 gigs of fonts would be detrimental to the boot up time for the most common design programs such as adobe illustrator. I would like to restore the font folder because I am no longer able to just delete the fonts. It takes too long. So when I right-click the fonts folder and select "Restore Previous Versions" I am able to find a restore point, but the "Restore" button is greyed out. this leads me to think that I cannot change the settings of files in the windows directory. Oh and there are 34,000 fonts I need gone. Thanks

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• What to do with old hard drives?

  - by caliban

  I have over 100+ old hard drives, ranging from 100MB Quantums to 200GB WDs, most of them PATA, some SATA. Most still working. The squirrel mentality runs in my family - hoard everything, discard nothing. Thus, and this is a relevant question - any suggestions on how to put these drives to use (anything) instead of them just being deadweights and space takers around the office? Hopeful objectives and suggestions to keep in mind when you post an answer : Should showcase your geekiness, or plain fun, or serve a social purpose, or benefit the community. You do not need to limit your answer to only one hard drive - if your project needs all 100++, bring it on! Your answer need not be limited to one project per hard drive - if one hard drive can be used for multiple projects, bring it on! If additional accessories need be purchased, make sure they are common. Don't tell me to get a moon rock or something. The projects you suggested should serve a utility, and not just for decoration purposes.

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• Broadband Traffic Question

  - by rutherford

  I have a broadband ADSL line with plus.net in the UK. Having checked the modem there is no firewall or any weird features enabled. But since I arrived at the apartment (the broadband already being installed), I cannot log into Twitter nor update any of my wordpress blogs (I can browse them and log in, but cannot save any edits or new posts). It only seems to affect these two sites in their unique ways. If I take the netbook I use in this place out to say a McDonalds or some other wifi access point then these sites work fine again. Anyone know what could possibly be preventing access of the pages in question? The only thing common to these pages are the POST response they are expecting. But POST form submission works fine on other sites...

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• Sharing / replicating EBS across AWS nodes

  - by skrat

  I would like to use single EBS storage across multiple EC2 nodes (web/app servers). I've read some articles on snapshot sharing, but that doesn't suit well for what we need. We use filesystem for storing DB record attachments, so if one such attachment gets created, we need it to be immediately available to all nodes (to serve). So far only NFS seem to be viable, but it's a pain to configure and maintain. Another option could be storing those attachments on S3 instead, but that would cut us of doing any analysis on that data. This must be quite common problem when scaling in AWS, what solutions are there?

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• Why does yum index get corrupted?

  - by TomOnTime

  Occasionally yum's cache gets corrupted and we see errors like this: error: db3 error(-30974) from dbenv->failchk: DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db3 - (-30974) error: cannot open Packages database in /var/lib/rpm The workaround is rm -f /var/lib/rpm/__db* and then the next "yum" command regenerates the data. My question is: what is likely to be causing this? Is there some common task that ignores locks or has other problem that causes this? We have hundreds of CentOS machines and there is no pattern to which see this problem. It could be a "one in a million" issue, which at large scale is seen often. NOTE: I realize this is a very "open ended" question, but if an answer finds the cause, I will go back and turn the question into something more canonical that directly relates to the specific issue.

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• A space-efficient filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• How to forward http traffic through a specific network adapter.

  - by user18129

  i have the following scenario. Two laptops are connected via a router through the Ethernet ports. These two computers need to be able to communicate together. One computer also needs to access the internet through a different adapter (i.e. we will taking these two laptops two various sites where by the most common type of internet access will be wireless).In isolation all of the various adapters work fine (i.e. the internal network works fine, and the wireless connects to the internet). However,we try to turn on all of the adapters at the same time,the following occurs: If we bridge the two network connections together on the "Server" -The internet connection doesn't work through the wireless If we don't bridge the connections The internet connections don't work It seems like http traffic is trying to be sent through the Ethernet adapter (which of course is not connected to an internet connection). How can we solve this?

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• Duplicate Name Exists error from virtual PC with NAT network configuration

  - by Phred

  Whenever I change the network configuration to NAT for a virtual machine running under Virtual PC 2007, I get "A duplicate name exists on the network." error. There is no other machine on my network with this name and running the VM in any other network configuration doesn't cause this error. This seems to be a common problem with Virtual PC 2007 based on a google search but no-one seems to have a solution to it. So far, I've discovered that turning off NETBIOS over TCP causes the problem to go away but I need to join this VM to a domain and you can't do that if NETBIOS over TCP is turned off.

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• How do I set up my home server to go directly to a port other than 80

  - by Kevin

  I'm using dyndns, a lynksis wt54g router, and tomcat 7 with spring to set up a web server. This is my first time to attempt this. I'm sure this is a very common question, but I don't know enough to find the answer after quite a bit searching. Dyndns is successfully forwarding to my ip. The main problem is, the router admin login is coming up when my url is used. I'm hosting my site on port 8080. I have port forwarding set up for port 8080 but my request times out when I attempt to use my url like this www.myurl1234.com:8080. I don't want users to have to type the port anyway. I also tried changing the management port to 82 and hosting on port 80, but I still get the router admin login when I use my url. Where am I going wrong? Can I set it up so that www.myurl1234.com goes straight to port 8080?

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• How are suspected DoS attacks handled by webservers?

  - by Jan Kuboschek

  I rent a server somewhere out in Canada or so that I'm using to host a website of mine. That website has close to 400,000 pages that I wanted to index today. For that, I wrote a crawler a while back (see JCrawler on Stackoverflow.com). Now, I'm greedy and didn't want it to take too long so I ran multiple threads resulting in some 60+ requests per second from my IP. A couple minutes later, my server locked me out. I can still FTP into it, but I can't HTTP it. As server administrator or user, do you have any idea how servers usually handle these situations? Is it common to place a permanent or temporary ban on the IP or what is typically done? Naturally, I'll re-run my software with fewer requests once I'm back on.

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• Grep /var/log for hacker/script kiddy activity and e-mail?

  - by Jason

  CentOS 6 Apache Server version: Apache/2.2.15 (Unix) Thinking about how to automatically, once a day, grep all the logs in /var/log/httpd for hacker, phishing, etc activity and e-mail it to myself so I can evaluate what I might need to do. But what are the patterns I can look for? IE, we dont run Wordpress and we see a lot of attempts to access Wordpress related content, obviously for an exploit. Same with PHPMyAdmin. I could do something like repeatedly, matching common patterns we see. # grep -r -i wp-content /var/log/httpd/ # grep -r -i php-my-admin /var/log/httpd/ How do I e-mail myself this the results of each grep command or better yet all Grep results in a single e-mail?

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• Disable CTRL + ALT + [LETTER] to produce accented variations

  - by Barney

  After an unknown config change, CTRL + ALT + [LETTER] has started producing common accented versions of [LETTER]. I'm not a big fan of this arrangement, seeing as I've memorized all my favourite ALT + [NUMPAD SEQUENCE] references and was used to using CTRL + ALT + [LETTER] for various other application-specific commands in my text editor. The prominent result from my searching suggests that this has something to do with a switch to an 'international keyboard', and says this can be removed in the control panel or toggled by hitting ALT + SHIFT, but I can't get my system to confirm this, and the solutions (or close approximations thereof) don't work. Specifically, I've been to Control Panel\Clock, Language, and Region\Language\Advanced settings and switched the override for default input method from 'language list' to English and I've been to Control Panel\Clock, Language, and Region\Language\Language options and made sure that I only have my one input method (UK). Other than that I'm not quite sure where to look. Any ideas?

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• USB drivers stopped working in Windows 8

  - by Maxim V. Pavlov

  I have installed an MSDN version of Windows 8 Professional (x64) RTM. For about 3 restarts everything worked well. But once I've rebooted again - USB drivers (all of them, inluding the USB 3 drivers) stopped working. Device Manager properties said that the USB driver is not compatible with the system. Gigabyte doesn't list Windows 8 drivers for my MB X58A-UD3R. Tried to reinstall windows 7 USB drivers - system said the current driver is fine and didn't want to reinstall. Is this the common Windows 8 problem? How can solve it or debug it even more?

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• Can't rename folders in Window 7/32bit after anti-virus change

  - by Tasos

  I recently started having the common, as I realized, problem of not being able to rename folders in Windows 7 (32 bit). I don't understand why it happened after almost a year of ideal use of Windows 7. I haven't removed the libraries nor can I think of anything else that could potentially cause this, at least as far as I know. The only thing I did recently was to change my anti-virus program from the freeware version of Avira to the freeware anti-virus Microsoft Security Essentials. Any idea on what the problem is and how to fix this?

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• Top causes of slow ssh logins

  - by Peter Lyons

  I'd love for one of you smart and helpful folks to post a list of common causes of delays during an ssh login. Specifically, there are 2 spots where I see a range from instantaneous to multi-second delays. Between issuing the ssh command and getting a login prompt and between entering the passphrase and having the shell load Now, specifically I'm looking at ssh details only here. Obviously network latency, speed of the hardware and OSes involved, complex login scripts, etc can cause delays. For context I ssh to a vast multitude of linux distributions and some Solaris hosts using mostly Ubuntu, CentOS, and MacOS X as my client systems. Almost all of the time, the ssh server configuration is unchanged from the OS's default settings. What ssh server configurations should I be interested in? Are there OS/kernel parameters that can be tuned? Login shell tricks? Etc?

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• can I make Excel always open a delimited text file with "text" translation?

  - by khedron

  Hi there, Opening a tab-delimited data file in Excel to view & manipulate the data is a very common operation around here. However, by default Excel (2003/4 or 2007/8) will read the columns in a "General" format, which occasionally does terrible things like turning "1/2" into "2-Jan". Is there a way to tell Excel never to do this, but always process the values as Text, without going through the format wizard, selecting all of the columns, and doing it manually? Extra points if this works in both Mac and Windows versions of Excel.

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• Windows and domain suffix addition

  - by grawity

  I have a DNS domain and host it on my own server. My desktop PC (Windows XP) is configured to have mydomain.tld as its primary DNS suffix. Now, when the system tries to resolve any domain - stackoverflow.com, for example - it tries with the suffix added first, even if the name has periods in it. In other words, it tries stackoverflow.com.mydomain.tld. before stackoverflow.com.. Is this valid according to DNS standards and common sense? Is there anything I can do to prevent it, other than removing the prefix completely? (I still want it to be appended to single-component hostnames. Currently I have two prefixes . and mydomain.tld. configured, but it isn't very fast when resolving foohost.)

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