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• How to boost playback volume in real time on media recorded with a very low volume.

  - by L Marksman

  I have never heard a satisfactory answer to this often misunderstood question, let me explain. Lets say I have a sound card and earphones/speakers that can play back audio loud enough in most cases. This is great but the problem is that you always find people who do not know how to record audio, from Youtube video's to music. So now you end up with a audio playback that only uses 10% or less of the capacity of your sound hardware, in vista/win 7 you will see this frequently in the mixer with the volume pushed up to max but the green sound level only goes up a millimeter or two. I am looking for (preferably free) software or a method to boost the sound level of any audio from any source in real time to use more of my hardware capacity similar to what VLC media player can do. Oh and please, do not tell me it is impossible. I am not trying to boost the volume past what my hardware is capable of, I am just trying to use my hardware's full capacity. Also please do not tell met to buy new hardware, I know I can use hardware amplification, I don't want to (like many others) spend money on a simple little problem like this. Thanks!

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• Network external hard drive reports not enough free space

  - by mzhang

  I'm running an Ubuntu (10.04) Samba server on a local network. The server has a 50GB internal drive with only 24MB free. I've shared a folder /samba from that drive. I also have a 1TB NTFS external hard drive mounted to the system. There is a symbiotic link from the Samba shared folder on the nearly-full internal drive to the plenty-of-free-space external drive (i.e. /samba/external_hd). I wish to copy a 3.25GB folder into the (remote) external hard drive, via a Mac (10.6.8). The Mac reports (correctly) that there's 24MB free on the server, and so will not let me copy the folder on the Mac over to the external drive (dragging the folder into /samba/external_hd), failing with a "server does not have enough free space" error. However, it seems that I can still scp the folder into the external drive, via the symbolic link. Is there a reason as to why this is happening (and are there any ways to prevent it)? Is this even good practice (to mount a drive and link into the directory)?

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• Are my web server permissions for uploading correct?

  - by user1699176

  I'm on debian and I have my website in the directory /srv/www/mysite.com/public_html I set chown for www-data:www-data on /srv/www. I have root disabled and created a sudo user which is id 1000:1000. I would also like to use this user to upload to /srv/www so I added my sudo user to the www-data group. I originally got a message saying that I didn't have permissions to upload a file to that directory. After playing around with multiple permissions for a while I finally was able to upload properly, but I'm not sure if this set up is correct. I'm hesitant to change it for now since it actually works, so I thought I'd ask for advice. I think what I ended up doing was this: sudo chown -R www-data:www-data /srv/www sudo chmod g+s /srv/www sudo usermod -aG www-data myuser sudo chgrp -R www-data /srv/www sudo chmod -R g+w /srv/www When I was finally able to successfully upload a file (with FileZilla) it showed the owner as myuser myuser. Shouldn't it have been www-data myuser? My question is whether this is correct and if there are any potential security issues? For example, I wasn't sure if I was actually supposed to use "myuser" to own the /srv/www directory instead sudo chown -R myuser:myuser /srv/www or maybe sudo chown -R www-data:myuser /srv/www If you need more info, let me know, thanks.

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• Google Sites (via Apps) setup questions

  - by Dave

  I thought that it would be a piece of cake to set up a Google site via Google Apps, but perhaps my previous (limited) experience with web development has given me unrealistic expectations. I have actually had a really tough time finding help with the exact question that I have, which is: How do I change the home page contents??? You see, I'm used to having hosting with someone like GoDaddy, where I can just ftp in and drop my HTML files in the www folder. From research I have found that this is simply not possible with any flavor of Google Sites. That's fine, I can live with it. So let's say I have www.mydomain.com. When I hit that URL, it redirects me to a very long URL (unfortunately) like https://sites.google.com/a/mydomain.com/sites/system/app/pages/meta/domainWelcome, which just says: Google Apps Welcome to mydomain.com If you are the domain administrator get started creating your home page with Google Sites Great! I want to do that. So I click on the "If you are the..." link and end up at a screen where I can choose a template, a name, and some visibility options. If I click on My Sites, there isn't a "default" site, i.e. the one that www.mydomain.com displays. I figured that maybe I just have to create a site first, so I went ahead and did that. My first test was to create a site that was publicly accessible. I thought that maybe if I did that, the Google would decide that this must be my home page since it's the only one. But it doesn't, and I still get the "Welcome to" page. Under "More Actions", I didn't see anything interesting except for "Manage site". I went in there and had a peek around, and didn't see anything about using this as the default home page. Am I looking for something that just doesn't exist? I can't believe there isn't a way to modify the "domain welcome to" page...

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• How to fix missing RAID1 drive

  - by Sodved

  I had to do some fiddling about with my cables inside thebox and now I am getting a "Critical Error" about the RAID disks during startup. I have a gigabyte GA-MA770T-UD3 motherboard. Aparently the RAID controller is an AMD SB710 chip. I'm pretty sure I know what happenned. The first time I rebooted I had forgotten the power cable on one of the disks in the RAID1 (mirror) and let it boot up. So I shut down and put the power back in. So now when it boots up I go into the RAID admin interface (between the BIOS screen and the OS loading): it shows the RAID1 as in error the logical device has one disk and says the other is disconnected or missing the other physical disk shows up as a single disk If I boot to the OS (Windows 7 32 bit) the data all seems to be there. If I go into computer management it says my partition is on a disk and working OK. But the other disk is offline because: "The disk is offline because it has a signature collision with another disk that is online" So I am guessing because I STUPIDLY booted up with only one of the disks powered on, the other disk fell out of synch with the mirror and so now cannot rejoin the mirror. How do I fix this? I want to get the RAID1 mirror working again. There does not appear to be any "Repair" option in the basic RAID admin tool which I get into during startup before the OS boots. I have not made any explicit changes to the online one (but I guess the OS has probably written some admin data).

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• How to upgrade iPhone 3G to iOS 5 now that iOS 6 is out? [closed]

  - by mmmshuddup

  My friend has an old iPhone 3G and I wanted to upgrade it to iOS 5 because I had read that the performance is actually better with iOS 5 on that phone in spite of the difference in processor power. The problem is that now that iOS 6 is out, iTunes only gives me the option to upgrade to that. I am a little more leery of iOS 6 knowing that it was launched mostly for the iPhone 5 and since that phone has a way faster processor, I would assume that performance would be an issue on the iPhone 3G. How can I, if possible, upgrade just to iOS 5? Note: I would like to avoid having to jailbreak the phone by all means possible. (It's not mine and I don't want to take the risk with a phone that doesn't belong to me.) EDIT: If anyone knows of a good site to get help on questions like this let me know. Apparently you're allowed to ask questions about iPhones here, just not this. Which is completely utter asinine, but oh well. Anyone with helpful ideas, post in the comments please.

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• DNS/Nameserver issue. Can't ping IP or domain

  - by Tar

  I get this when I ping an IP: 21:31:50.136623 IP SITE_IP > 173.194.33.4: ICMP echo request, id 14941, seq 1, length 64 21:31:51.136138 IP SITE_IP > 173.194.33.4: ICMP echo request, id 14941, seq 2, length 64 21:31:52.136118 IP SITE_IP > 173.194.33.4: ICMP echo request, id 14941, seq 3, length 64 21:31:53.136129 IP SITE_IP > 173.194.33.4: ICMP echo request, id 14941, seq 4, length 64 21:31:54.136102 IP SITE_IP > 173.194.33.4: ICMP echo request, id 14941, seq 5, length 64 21:31:55.136153 IP SITE_IP > 173.194.33.4: ICMP echo request, id 14941, seq 6, length 64 and when I ping a domain: 21:29:33.631583 IP 74.125.189.19.52085 > SITE_IP.domain: 28952 A? google.com.MY_DOMAIN. (42) 21:29:38.626553 IP SITE_IP.42280 > 8.8.4.4.domain: 52435+ A? google.com.MY_DOMAIN. (42) 21:29:38.652675 IP 74.125.189.22.63658 > SITE_IP.domain: 36178 A? google.com.MY_DOMAIN. (42) 21:29:43.631626 IP SITE_IP.48205 > 8.8.8.8.domain: 52435+ A? google.com.MY_DOMAIN. (42) The pinging of a domain is what worries me, because it looks like it is checking my DNS files for the resolution. Here is etc/resolv.conf nameserver 8.8.8.8 nameserver 8.8.4.4 /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 SITE_iP server.MY_DOMAIN.com server Will also add that I am seeing a number of 'SERVFAIL'.. I have no idea what could be causing this problem. If there is any other information I need to provide, let me know. I'm using CentOS.

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• How many bootable partitions are possible to have on one hard drive?

  - by draiden

  This may not be the correct place to post this; if that's the case, just let me know and point me in the right direction please! I'm thinking of building a box that needs to be lightweight and portable, and would need to be able to boot multiple installations of windows. I am needing to have multiple installations so that I can, for example, plug the box in to the network at one location, boot in to that location's partition, and have full access to everything I would normally need to do on a computer that has already been set up on that network. Then, when I go to the next client, I would be able to do the same thing, with the new location's partition, and have all of those network settings, drive mappings, etc., available there. Obviously I'd need to go through and set them all up on the different locations/networks, I'm not expecting it to magically know where I am and what I'm doing. It would be like I'm carrying around a computer that is configured for each place I need to go in one little box, instead of having to have multiple computers or having to reconfigure all the settings and such every time I go to another client. Or is there an easier way to do this that I haven't learned of?

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• Why did I loose access to the mailboxes on my old web/mail host after changing to a new one but keeping old MX values

  - by LaserBeak

  So I changed the NS records with registrar to point at the new webhosts DNS servers and edited the SOA record there, deleting the new hosts default MX records and instead putting in the old ones for the old web\mail hosts. The website A record is however pointing at the new webhosts servers and the site comes up fine. But none of this should cause me to loose access to mailboxes on my old hosts mail server right? I log into the control panel on the old host, all the mailboxes are there, all the passwords are fine but I can't log in using either webmail or pop3, says incorrect log-in/password. I even created a new mailbox and password for it respectively, but it would not let me log in. For what its worth I did not change\delete the records for 'A' on the old webhost zone file, since I am not hosting the site with them anymore and NS records are pointing to other hosts DNS servers/zone file so that shouldn't matter right? The old hosts mailserver is also not simply down, I can tell because through the control panel I setup a mail forward for one of the existing inboxes and when sending mail to it, it receives it and forwards it fine. So from this I can deduce that I have correctly inputted the old hosts MX records into the zone file hosted on the new hosts DNS and the mail is being sent to the old hosts mail server(s) and is successfully forwarded by it. But why can't I log into those account/inboxes anymore ?

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• What happened to 'Copy Public Gallery Link' for folders in Photos in Dropbox?

  - by Transgenic

  I've been trying to figure out how to use the 'Photos' folder properly, but it does not seem to contain the functionality that is mentioned on various websites. From what I've read, you are supposed to create a folder within the 'Photos' folder. At that point, it becomes a public gallery for which you can access the context menu item Copy Public Gallery Link. However, I do not have this context menu item. I found a topic on the DropBox forum, but it is 2 years old. Even the various website information mentioned is over a year old. I found a topic from this year on SuperUser that mentions about the Share link menu item. I understand that this functionality is basically the same as Copy Public Gallery Link, however, the key difference is that it opens the website for which I need to click 'Copy link to this page' link, which then adds it to the clipboard. My primary questions are: Did they phase out the Copy Public Gallery Link from the context menu entirely? If not, is there a way to re-enable this menu item? If not, am I using the Photos folder properly? Lastly, if there is no way to get this menu item, is there some kind of script or hack-around that will let me simplify the Shark link + Copy link to this page functionality without requiring it to open my web browser? Note: I had to edit my post to remove other website links that I mention since I'm considered a 'New User' here and am only able to post 2 hyperlinks. Sorry.

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• What's the proper way to prepare chroot to recover a broken Linux installation?

  - by ~quack

  This question relates to questions that are asked often. The procedure is frequently mentioned or linked to offsite, but is not often clearly and correctly stated. In an objective to concentrate useful information in one place, this question seeks to provide a clear, correct reference for this procedure. What are the proper steps to prepare a chroot environment for a recovery procedure? In many situations, repairing a broken Linux installation is best done from within the installation. But if the system won't boot, how do you fix it from within? Let's assume you manage to boot into an alternate system. Once there, you need to access your broken installation in order to fix it. Many recovery How-Tos recommend using chroot in order to run programs as if you are actually booted into the broken installation. What is the basic procedure? Are there accepted best-practices to follow? What variables need to be considered in order to adapt the basic preparation steps to a particular recovery task? As this is Community Wiki, feel free to edit this question to improve it as well.

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• Web Server slows down (ASP.NET)

  - by mfeingold

  below is a question I posted on stackoverflow . as suggested by Martin Clarke I also post it here. We have a really strange problem. One of the servers in the server farm becomes really slow. We see a number of timeouts in the logs and overall response time is not where it should be (and is on other servers in the farm). What is also strange is that it is not just the web app - Just logging into the server takes up to 1.5 min to show you the desktop. Once you are in, the system is as responsive as ever - unless you try to launch something, i.e. notepad - it takes another minute to launch and after launch it works fine. I checked a number of things - memory utilization is reasonable, CPU is below 15%, windows handles, event logs do not show anything. Recycling the aps.net process does not fix it - it still takes over a minute to log in. Rebooting the server helped, but now it started to slow down again. After a closer look we found out that Windows Temp directory is full of temp files - over 65k files. This is certainly something to take care of. But my question is could it be the root cause of the sluggishness, or there is still something else lurking in the shadows? Edit After more digging I am zeroing in on the issue related to the size of temp directories. This article: (see the original post this thing will not let me include a second link) describes something very similar. It still does not answer the question why the server is still slow even there is no activity.

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• Redirect without changing URL

  - by Coobadivin

  Here's the setup. We have a hardware load balancer with an http virtual cluster. Let's call this virtual cluster example1.com. This virtual cluster load balances between two squid reverse proxies which are also on the same physical servers as the web servers. Squid listens on 80 and points to itself as the cache_peer web server which listens on 81. We also have a standalone web server which we will call example2.com. What we are trying to do is create a subdirectory on example1.com called example1.com/example2. This will point to example2.com, but we want our users to stay at example1.com/example2 in their browser. So, it's like a redirect without actually being a redirect. How the hell do I go about doing this? Is this even possible? I'm looking at squid docs in the meantime. example1.com is running a proprietary web server - not Apache :( We can't host example2.com's content in example1.com's file system. These are two very different platforms.

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• Host to set up postfix to use external smtp server

  - by Leo

  I have a web server and a mail server. Both have the same domain name except, one points to mywebsite.com and the other is mail.mywebsite.com. They have different IPs. I'm trying to set up postfix on my web server so it uses my mail server as the server that sends e-mails. I followed this guide: http://www.howtoforge.com/postfix_relaying_through_another_mailserver I am getting this error in my logs: Oct 28 02:56:45 mywebsite postfix/smtp[1660]: warning: host mail.mywebsite.com[xxx.xxx.xx.xx]:25 greeted me with my own hostname mywebsite.com Oct 28 02:56:46 mywebsite postfix/smtp[1660]: warning: host mail.mywebsite.com[xxx.xxx.xx.xx]:25 replied to HELO/EHLO with my own hostname mywebsite.com I've searched around and I read that you can't use the same hostname when relaying to a separate smtp server. Is there a work around for this? Do I need to set up my mail server with a separate domain name? Also I have my MX records set up for both mywebsite.com and mail.mywebsite.com. I'm not that experienced with this so if I need to give more info let me know. Thanks!

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• HP LaserJet 1515: Disable "refill" warning

  - by Pekka

  I have a HP LaserJet 1515 connected to a Windows 7 PC. The Magenta cartridge is empty; the printer shows a warning to that effect, and won't let me print even black-and-white documents any more. I can't turn the warning off manually using the printer's small console: When I try to enter any menu, the display says "Menu access disabled". I have no idea why. There is a setting to override the warning, but it can't be changed using the Network interface in the browser (Although it is there on the status page) According to the manual,the HP printing tool is supposed to offer a switch for this, but it won't install on my Windows 7. It just rumbles about for half an hour, to magnificently exit with an "unknown error" requiring a reboot. On second look, the problem seems to be that Windows 7 just isn't supported. There is no download link for the tool when you specify Windows 7 as your OS. I just want to print a black-and-white-document on a printer whose black cartridge is still 65% full. Is this indeed impossible? On second thought, I'm cross-posting this on the HP support forum. I'll update here if anything comes up.

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• Computer Turns on Briefly then right back off again.

  - by goddamnyouryan

  So yesterday I came home from work and went to turn my computer on....it turned on for about 5 seconds then promptly turned right back off again...before I ever saw anything on the screen. I tried again, same result. After several attempts, I've found that the length at which it turns on differs. After trying multiple times in a row, it only stays on for about 3 seconds. If I let it rest for a bit it sometimes will stay on for up to a minute (though it never boots, the screen stays black the whole time). I'm not sure what is causing this issue...I built this computer a little more than 2 years ago and this is the first issue I have ever had with it. I did all the usual checks: -It's not the power switch -The capacitors on the motherboard all seem to be in working order -The PSU seems to be fine as it lights up, fan spins, and will sometimes stay on for about a minute period My hope is that the thermal paste on the cpu has degraded and just needs to be re-applied. Does that seem like a reasonable assumption? I'm going to tear the thing apart and do a minimum system build when I get home, but any heads up as to what I should be looking for would be much appreciated. Any thoughts?

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• Enterprise level Ticketing and inventory system reccomendations [closed]

  - by TrackingSystem

  My company is sort off at a stand still when it comes to our technician ticketing and inventory system. We currently use Numara TrackIt! - which isn't cutting it to say the least. Dell recommended KACE, but it's web based which is what we would like to avoid. We need a good ticketing and inventory system with the following: Server/Client setup Client supports XP/Windows 7 Ent. Web Based as well as Client is a plus Technician ticketing Active Directory integration Inventory System (Asset tag tracking etc/PO tracking) Exchange integrated - when tickets are made you have an option to send to the requester. Something that will scale well Please, if anyone is a Systems Admin or has knowledge regarding use of a great ticketing system please let me know. We have a large international corporation - price honestly isn't an issue. Keep in mind this will be mainly used for technicians to create tickets, enter inventory(track PCS) and possible even an option to track purchase orders. We want an enterprise level ticketing system with these capabilities please help! Thank you.

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• SSO to multiple websites from Sharepoint website

  - by Aico

  We have an intranet based on Sharepoint 2010. In this intranet we have several links to other webservers within the same Active Directory, for example a link to our Outlook Web Access site on our Exchange 2010 environment. We have three different setups which visit this Sharepoint environment and the other webservers: Windows 7 clients that are a member of the Active Directory Home pc's that connect through a SSL VPN appliance Standalone thin clients (Windows 7 embedded) within the corporate network The goal is to let people only sign in once. In the first group this isn't a problem because the AD Integrated Authentication works fine and the Windows logon is passed on to Sharepoint and the other webservers. The second group is also working fine because of the LDAP integration that the SSL VPN appliance uses. The third group is however experiencing issues. They need to enter their credentials everytime they click a link to another webserver. They first need to enter credentials for accessing the Sharepoint environment. When clicking the link for their webmail they have to re-enter their credentials, and so on. Can someone tell me what the best solution would be to also get SSO working fine for the third group? Some extra information: We also have a Forefront TMG server in our environment. I read somewhere that Forefront might be part of a solution for this problem, but not sure how. Maybe someone here can help me? Look forward to some help. Best regards, Aico

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• Could I have destroyed Partitioning-Scheme/Filesystem of HDDs with External Harddrive Case with builtin Raid-Controller?

  - by th3m3s

  I had just recently bought a Fantec QB-35US3R to have a nice box on my desk to make some backups to. Along with the HDD-Bay I had ordered some 4TB HDDs to let them run in Raid 5, which is handled by the hardware RAID controller of the Fantec HDD-Bay. The QB-35US3R arrived a few days before the hard drives, so I got impatient and had the idea to put three old 1TB disks in the Fantec device, just to test it... Long story short: I made a backup of the most important data on these three disks before they broke. I had set the configuration scheme to RAID 3 at the Fantec device. It seems, that the Fantec RAID controller has "somehow" destroyed the partitioning scheme or the file system, because when put into a HDD docking station, they get recognized by the OS (Ubuntu/Linux) but are not mountable anymore. I tried to recover the data from one HDD via gParted (parted), which ran some hours without success. Here I stopped, before trying other tools, cos I read that the longer a hard drive is running after a the partitioning got destroyed, the worse it gets. What could the HDD-Bay probably have done to my lovely hard drive disks? Is there some routine a RAID controller is executing, when it wants to create a RAID system? Like erasing the partition table (seems not plausible to me.) or writing some information to every hard drive in the RAID (seems more likely to me.)? Is there a chance to recover the data from these HDDs, or is the change a RAID controller makes so significant, that no software is of help?

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• OSX server setup suggestions

  - by Tom

  I am looking into the possibility to setup an OSX server for my employees, and would like some input on what is the best approach to meet my needs, and perhaps some suggestions if I am moving in the wrong direction. I am thinking of a Mac Mini OSX server, and are not sure if my needs will be met, and what possibilities are out there. I want these capabilities: - Groups/Users managed on server - Shared folders and private folders for users/groups - Access to activated services - Server hosting software for the users (developing tools ++) - Similar to Windows Terminal Server - Virtual desktop environment (both local and over internet/VPN) - Possible to access trough Mac and Windows The reason I am looking at OSX server is that my employees almost only work in OSX environment, and I want to offer the capabilities to logon to the server trough some kind of terminal software, and have full access to their work OSX environment and software on their mac or pc, from anywhere they might be. Instead of having to have multiple setups and need for spending alot of time installing and setting up needed software on every client. This is a small business, where some work on local network, and others from the internet, preferably trough VPN. But a terminal server solution, that are fast and easy to manage would be perfect for our needs. So if anyone have any experience with a similar setup, please let me know what you did, and your experiences with your setup.

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• Install KVM based Windows 2008 remotely over SSH on a headless, no graphics Ubuntu 10.04 server?

  - by taazaa

  Hi, I have a Dell server at a remote data center with Ubuntu 10.04 as the host. It is a minimal install with the necessary virtulization packages. There is no X and the machine is headless. I have the win2008 DVD in the machine and want to remotely install it. I tried: virt-install --connect qemu:///system -n vmwin2k8 -r 1024 --disk path=server2k8.qcow2,size=50 --cdrom /dev/sr0 --vnc --noautoconsole --os-type windows --os-variant win2k8 The qcow2 image get created However I don't understand how to connect to see the install via VNC. This is my first time doing it so it may be trivial or may not be possible. Remotely I have a Win 7 machine with Putty and RealVNC viewer. Where is the graphic output of VNC going? Do I have to have VNC server running on the host or some other machine and then connect to it from my VNC client? Please let me know or point me to the right direction. I have been searching the web for several days to figure out how this is suppose to work. Thanks!

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• Faster caching method

  - by pataroulis

  I have a service that provides HTML code which at some point it is not updated anymore. The code is always generated dynamically from a database with 10 million entries so each HTML code page rendering searches there for say 60 or 70 of those entries and then renders the page. So, for those expired pages, I want to use a caching system which will be VERY simple (like just enter a record with the rendered HTML and (if I need) remove it). I tried to do it file-based but the search for the existence of a file and then passing it through php to actually render it , seems like too much for what I want to do. I was thinking of doing it on mysql with a table with MEDIUMBLOBs (each page is around 100k). It would hold about 150000 such records (for now, at least). My question is: Would it be faster to let mysql do the lookup of the file and the passing to php or is the file-based approach faster? The lookup code for the file based version looks like this: $page = @file_get_contents(getCacheFilename($pageId)); if($page!=NULL) { echo $page; } else { renderAndCachePage($pageId); } which does one lookup whether it finds the file or not. The mysql table would just have an ID (the page id) and the blob entry. The disk of the system is a simple SATA raid 1 , the mysql daemon can grab up to 2.5GB of memory (i have a proxy running too, eating the rest of the 16GB of the machine. ) In general the disk is quite busy already. My not using PEAR cache, is because I think (please feel free to correct me on this) it adds overhead I do not need because the page rendering code is called about 2M times per day and I wouldn't want to go through the whole code each time (and yes, I have eaccelerator to cache the code too). Any pointer to what direction I should go, would be greatly welcome. Thanks!

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• What should I use to ping multiple IPs and get notified of time outs?

  - by HumanVirus

  I've been using MultiPing to ping hundreds of IPs (from access points and such) and check their performance (packet loss, latency) and uptime. The program is very easy to use, but I was wondering if someone could recommend me something that would work better and that would also work in Linux. The features I'm looking for are: Notification Types: At least desktop notifications and SMS, but it would be great if it also had e-mail, IM, or other types of notifications. (MultiPing has some of these, but they don't work too well.) Being notified about the root problem only: Since some devices are dependent on others, I'd like to be notified only about the root problem. E.g. Let's say I have A[x.x.x.222]B[x.x.x.33C[x.x.x.44]D[x.x.x.55], and B goes down, therefore C and D will also be down. Is it possible to get a notification only about B being down? Light on resources. Ideally multiplatform or at least available for both Linux and Windows. I've heard about Nagios and Shinken being used for monitoring. Would you recommend that I use something of the sort or would that be too much for my needs? If using Nagios, Shinken, or similar software is recommended, can anyone tell me what sites I should go to or what books I should get that would be good for someone who is totally new at this? I'd appreciate any suggestions.

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• Passive mode FTP file download hangs from specific machine

  - by chiptuned

  I have a server which is an AWS instance that just cannot download files from a specific FTP server. I can connect to the FTP server fine and run some commands, but when I request a file it just hangs. Here is the debug output of the base linux ftp client after login: ---> SYST 215 UNIX Type: Apache FtpServer Remote system type is UNIX. ftp> get outgoing/catalog.gz catalog.gz local: catalog.gz remote: outgoing/catalog.gz ---> PASV 227 Entering Passive Mode (64,156,167,125,135,191) ---> RETR outgoing/catalog.gz 150 File status okay; about to open data connection. Thats it. Then it just sits there and nothing transfers. I have verified that a data connection is made but the client gets no data. ? ss -nt dst 64.156.167.125 State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 0 10.185.147.150:41190 64.156.167.125:21 ESTAB 0 0 10.185.147.150:48871 64.156.167.125:48557 The FTP server is not in my control and downloads from other FTP servers in passive mode have worked. Active mode does not work as the system is behind a firewall. Every FTP client I've tried has the same problem. The download works from other systems, even from other AWS instances I have with the same Security Group. Not necessarily the same distro or config though. I understand it may be some issue on the server side, but I want to know what it is about my particular machine where the transfer hangs and where on every other machine I can get my hands on, it works. Please let me know what the culprit on the client side could be or ideas on what else to look at.

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• Sudo won't execute command as another user

  - by TOdorus

  I'm trying to get a unicorn server to start when the server boots. I've created a shell script which works if I log as the ubuntu user and run /etc/init.d/unicorn start Shell script #!/bin/sh case "$1" in start) cd /home/ubuntu/projects/asbest/current/ unicorn_rails -c /home/ubuntu/projects/asbest/current/config/unicorn.rb -D -E production ;; stop) if ps aux | awk '{print $2 }' | grep `cat ~/projects/asbest/current/tmp/pids/unicorn.pid`> /dev/null; then kill `cat ~/projects/asbest/current/tmp/pids/uni$ ;; restart) $0 stop $0 start ;; esac When I rebooted the server I noticed that the unicorn server wasn't listening to a socket. Since I ran the code succesfully as the ubuntu user I modified the script to let it always use the ubuntu user via sudo. #!/bin/sh case "$1" in start) cd /home/ubuntu/projects/asbest/current/ sudo -u ubuntu unicorn_rails -c /home/ubuntu/projects/asbest/current/config/unicorn.rb -D -E production ;; stop) if ps aux | awk '{print $2 }' | grep `cat ~/projects/asbest/current/tmp/pids/unicorn.pid`> /dev/null; then sudo -u ubuntu kill `cat ~/projects/asbest/current/tmp/pids/uni$ ;; restart) $0 stop $0 start ;; esac After rebooting unicorn still wouldn't start, so I tried running the script from the command line. Now I get the following error sudo: unicorn_rails: command not found I've searched high and low to what could cause this, but I'm afraid I've tapped my limited understanding of Linux. From what I can understand is that although sudo should use the ubuntu user to execute the commands, it still uses the environment of the root user, which isn't configured to run ruby or unicorn. Does anybody have any experience with this?

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