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  • How does one make sure or even guarantee server time are sync correctly between dozens of servers across multiple datacenter on different location?

    - by forestclown
    Currently our web applications contain a logic to check if the data sent to the web server is expired or not by comparing the timestamp of the data with the date/time of the server. Everything goes will, until some dude from data center accidentally modify one of the web server date/time and causes some disruptions in our web services. My managers are of course not happy with this, and said we shouldn't use timestamp to check expiry in the first place...anyway.... Network Time Protocol is implemented, because of data centers are spread across different continents so we have one NTP server in each data center. The servers within the data center will have cron jobs to check against the time with their NTP server from the same data center. If time is out of sync it will auto update the server date/time. But then with our managers not happy with it, and think it could still easily causes the same problem. e.g. what if someone accidentally modify the NTP date/time? what if all the NTP servers are out of sync with each other? which NTP servers we can really trust? and blah blah.. So my questions are: What are the current practice to sync date/time between servers across multiple data centers or locations? How does one manages time stamp between web apps? e.g. Server A send data (contain timestamp of Server A) to Server B (compare timestamp between Server B and the timestamp from the data to see if it has expired or not. This is to avoid HTTP replay) Should we really not use timestamp check? Thanks & Best Regards

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  • What's the fastest and automatic way to transfer 2GB of data between 2 PCs every night?

    - by phan
    While it's fast (less than 2 minutes) I hate having to copy files from PC #1 onto a USB stick, and then manually popping it in PC #2 to copy the files to PC #2. Dropbox is too slow in uploading and then downloading 2GBs (synching), it could take hours. Copying 2GBs over the network is also slow because we're dealing with 10,000 little files that totals 2GBs, and not just one, giant 2gb file. Not sure why, but dealing with 10,000 little files makes the copy process much longer. Is there any other method that I'm missing? Any ideas? I'm using Win7 on both PCs. Edit: These files change every single night.

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

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

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  • Homebrew large data cluster access for 2 user levels?

    - by Yegor
    The title probably makes little sense, so here is an example. I have a file hosting site, that serves a large amount of semi-randomly accessed files. The setup is as follows: High horsepower front-end +DB server that also does encoding for files that need encoding Fresh file server, which stores newly uploaded content, thats probably (and usually) rapidly accessible, which has 500GB of raided SSD storage, that can push over 3GBit of traffic. 3 cheap node servers, containing 2 x 750GB SATA drives in raid1, where files older than 2 weeks are archived, from the SSD server (mentioned above). Files on each server are accessed via subdomains (via modsec) in a straight forward fashion (server1.domain.com, server2.domain.com, etc) Where I have the problem is this. I introduced a "premium" service where people pay a small fee every month, and get ad-free, quick accesses to stuff on the site. Once they are logged in, they access same files via premium.server1.domain.com via a different modsec script, with a different pass phrase. That all works fine and dandy.... except the cheap node servers are all IO bound, so accessing the files on them via a different, unsaturated network makes no difference, since it cannot read off the drive fast enough. What would be a good way to make files on the site be accessible via 2 different network routes, 1 of which will be saturated (the "free network") while all other files are on an un-saturated "premium" network?

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  • How can I check whether a volume is mounted where it is supposed to be using Python?

    - by Ben Hymers
    I've got a backup script written in Python which creates the destination directory before copying the source directory to it. I've configured it to use /external-backup as the destination, which is where I mount an external hard drive. I just ran the script without the hard drive being turned on (or being mounted) and found that it was working as normal, albeit making a backup on the internal hard drive, which has nowhere near enough space to back itself up. My question is: how can I check whether the volume is mounted in the right place before writing to it? If I can detect that /external-backup isn't mounted, I can prevent writing to it. The bonus question is why was this allowed, when the OS knows that directory is supposed to live on another device, and what would happen to the data (on the internal hard drive) should I later mount that device (the external hard drive)? Clearly there can't be two copies on different devices at the same path! Thanks in advance!

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  • Does PHP *have* to serialize/unserialize session data between each HTTP request? Or is there a sett

    - by Pete Alvin
    I think I understand why sessions are evil but for snappy client user experience I don't want to have to re-query the database on each HTTP request. (As a comparision, Java servlets can effortlessly keep tons of session objects in memory.) Can PHP be set to do this or does it have to serialize because it runs from CGI/FastCGI and therefore by definition is a new process each time a request comes in? I will be running PHP using LAMP.

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  • Does the Fast Video Download addon share my data?

    - by Frost Shadow
    I've installed the Fast Video Download version 3.0.8 addon for Firefox to download flash videos, like from youtube. What I'm wondering is, how does the addon download it, and do other people see that i'm downloading the videos? For example, is all the software to download the video already on my computer, or does the addon contact someone else to get the video, or let them know? Can the webpage's administrator see I'm downloading the video?

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  • Laptop VGA Output Stopped Working

    - by Jack7890
    I regularly use an external monitor with my laptop. Today, when I booted up, the external monitor refused to work--it just keeps going into power save mode. I tried a different external monitor and had the same problem, so it must be a problem with the laptop itself. Things I've tried: Going into the Display Settings via the Control Panel (I'm running Vista) and attaching/unattaching/reattaching the external monitor. Turning the computer off, unplugging, plugging it back in, and rebooting Blowing into the VGA out to get rid of any dust Toggling through the Fn+F7 options I'm thinking maybe this is an issue with my video card? If necessary, I'm comfortable opening up my laptop and playing around with things, but I'm not sure what to look for. Does anyone have any suggestions?

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  • Laptop VGA Out Stopped Working

    - by Jack7890
    I regularly use an external monitor with my laptop. Today, when I booted up, the external monitor refused to work--it just keeps going into power save mode. I tried a different external monitor and had the same problem, so it must be a problem with the laptop itself. Things I've tried: Going into the Display Settings via the Control Panel (I'm running Vista) and attaching/unattaching/reattaching the external monitor. Turning the computer off, unplugging, plugging it back in, and rebooting Blowing into the VGA out to get rid of any dust Toggling through the Fn+F7 options I'm thinking maybe this is an issue with my video card? If necessary, I'm comfortable opening up my laptop and playing around with things, but I'm not sure what to look for. Does anyone have any suggestions?

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  • How to backup data on debian vps to dropbox?

    - by IBr
    I have really simple private VPS with some webpages and music server. I want to backup some configs and some scripts to dropbox or similar service. Server has no gui (except simple ssh X forwarding, which is neither convenient for constant usage and does not provide full desktop) everything is controlled through ssh. So my question would is it possible to setup dropbox client for command line use? How? Is there any alternatives for dropbox, which would have command line clients? Also is it possible to incorporate backup into script for cron job?

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  • Dell Latitude E6420 dual-boot Ubuntu + Windows 7 Optimus graphics problems

    - by Ryan
    I have a Dell Latitude E6420 laptop with Ubuntu 12.04 alongside Windows 7 (dual-boot) docked in a docking station with 2 DVI outputs. It took me a week of tinkering to get the dual external monitors to work in Ubuntu, and I had to disabled the "Optimus" feature in the BIOS. But now neither external monitor is detected in Windows, and the resolution is also very low. Do you know how I can successfully dual-boot Windows 7 and Ubuntu on this machine using my 2 external DVI monitors? I have an open question here too, trying to resolve this same issue: http://askubuntu.com/questions/146933/dock-with-dual-external-dvi-monitors-with-intel-nvidia-optimus

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  • How to change internal page numbers in the meta data of a PDF?

    - by YGA
    I have a pdf document I created through non-Acrobat means (printing to pdf, then merging a bunch of pdfs), but I'd like to manually change the page numbers (i.e. the first several pages are simply title pages, the page that is labeled "page 1" is really the 7th sheet of the pdf). What's the simplest (and ideally, free) way to do this? To be clear, I am not trying to change the numbers on the pages themselves, but the page numbers in the "metadata" that the pdf stores (the pages themselves are already numbered correctly; I just want "go to page 1" to go to the page labeled 1, which could be sheet 7). For what it's worth, I'm on Windows, though I have access to Macs as well.

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  • Should I use "Raid 5 + spare" or "Raid 6"?

    - by Trevor Boyd Smith
    What is "Raid 5 + Spare" (excerpt from User Manual, Sect 4.17.2, P.54): RAID5+Spare: RAID 5+Spare is a RAID 5 array in which one disk is used as spare to rebuild the system as soon as a disk fails (Fig. 79). At least four disks are required. If one physical disk fails, the data remains available because it is read from the parity blocks. Data from a failed disk is rebuilt onto the hot spare disk. When a failed disk is replaced, the replacement becomes the new hot spare. No data is lost in the case of a single disk failure, but if a second disk fails before the system can rebuild data to the hot spare, all data in the array will be lost. What is "Raid 6" (excerpt from User Manual, Sect 4.17.2, P.54): RAID6: In RAID 6, data is striped across all disks (minimum of four) and a two parity blocks for each data block (p and q in Fig. 80) is written on the same stripe. If one physical disk fails, the data from the failed disk can be rebuilt onto a replacement disk. This Raid mode can support up to two disk failures with no data loss. RAID 6 provides for faster rebuilding of data from a failed disk. Both "Raid 5 + spare" and "Raid 6" are SO similar ... I can't tell the difference. When would "Raid 5 + Spare" be optimal? And when would "Raid 6" be optimal"? The manual dumbs down the different raid with 5 star ratings. "Raid 5 + Spare" only gets 4 stars but "Raid 6" gets 5 stars. If I were to blindly trust the manual I would conclude that "Raid 6" is always better. Is "Raid 6" always better?

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  • Preventing 'Reply-All' to Exchange Distribution Groups

    - by Larold
    This is another question in a short series regarding a challenging Exchange project my co-workers have been asked to implement. (I'm helping even though I'm primarily a Unix guy because I volunteered to learn powershell and implement as much of the project in code as I could.) Background: We have been asked to create many distribution groups, say about 500+. These groups will contain two types of members. (Apologies if I get these terms wrong.) One type will be internal AD users, and the other type will be external users that I create Mail Contact entries for. We have been asked to make it so that a "Reply All" is not possible to any messages sent to these groups. I don't believe that is 100% possible to enforce for the following reasons. My question is - is my following reasoning sound? If not, please feel free to educate me on if / how things can properly be implemeneted. Thanks! My reasoning on why it's impossible to prevent 100% of potential reply-all actions: An interal AD user could put the DL in their To: field. They then click the '+' to expand the group. The group contains two external mail contacts. The message is sent to everyone, including those external contacts. External user #1 decides to reply-all, and his mail goes to, at least, external user #2, which wouldn't even involve our Exchange mail relays. An internal AD user could place the DL in their Outlook To: field, then click the '+' button to expand the DL. They then fire off an email to everyone that was in the group. (But the individual addresses are listed in the 'To:' field.) Because we now have a message sent to multiple recipients in the To: field, the addresses have been "exposed", and anyone is free to reply-all, and the messages just get sent to everyone in the To: field. Even if we try to set a Reply-To: field for all of these DLs, external mail clients are not obligated to abide by it, or force users to abide by it. Are my two points above valid? (I admit, they are somewhat similar.) Am I correct to tell our leadership "It is not possible to prevent 100% of the cases where someone will want to Reply-All to these groups UNLESS we train the users sending emails to these groups that the Bcc: field is to be used at all times." I am dying for any insight or parts of the equation I'm not seeing clearly. Thank you!!!

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  • Adaptec 2020SA RAID controller Set up in RAID5, one drive went down, can I still get data?

    - by SJaguar13
    I have 6 1tb drives in a RAID5. 1 drive went down. On the RAID was 2 virtual machines that I really need back up and running. The spare drive I have to put in the server is a 1.5tb drive, which exceeds the physical per drive limit of the 2020SA. The drive is found in the disk utility, but it is not found in the array management section. I cannot add the drive to the array to have it rebuild. I have a replacement drive along with some spares on their way from Newegg, but I am still looking at a few days of downtime. Is it possible to use the 5 working drives to get the VMs copied off and on to another server or do I just have to wait for the drives to get here?

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  • Standard for feeding test data to a Nagios plugin?

    - by chiborg
    I'm developing a Nagios plugin in Perl (no Nagios::Plugin, just plain Perl). The error condition I'm checking for normally comes from a command output, called inside the plugin. However, it would be very inconvenient to create the error condition, so I'm looking for a way to feed test output to the plugin to see if it works correctly. The easiest way I found at the moment would be with a command line option to optionally read input from a file instead of calling the command. if($opt_f) { open(FILE, $opt_f); @output = <FILE>; close FILE; } else { @output = `my_command`; } Are there other, better ways to do this?

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  • How can I transfer a logged in user's login data from one server to another?

    - by Martin
    I have one server "A" where users can login. Login is verified by an LDAP server "L". I have a different server "B" were users can log in, too. Login is verified by the same LDAP server as before. Both servers are standard web servers with PHP. My goal is: If a user is logged in to server "A", and if he clicks a link to log in to server "B", the user should automatically be logged in without re-entering username and password. What is a good and secure way to achieve this? I can't submit username and crypted password to server "B". I can't use the PHP session of server "A", because it does not exit on "B". Cookies won't work either. I think that there is a way, but I just can't see it. Any help is very much appreciated.

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  • How to properly backup mediawiki database (mysql) without messing up the data?

    - by Toto
    I want to backup a mediawiki database stored in a MySQL server 5.1.36 using mysqldump. Most of the wiki articles are written in spanish and a don't want to mess up with it by creating the dump with the wrong character set. mysql> status -------------- ... Current database: wikidb Current user: root@localhost ... Server version: 5.1.36-community-log MySQL Community Server (GPL) .... Server characterset: latin1 Db characterset: utf8 Client characterset: latin1 Conn. characterset: latin1 ... Using the following command: mysql> show create table text; I see that the table create statement set the charset to binary: CREATE TABLE `text` ( `old_id` int(10) unsigned NOT NULL AUTO_INCREMENT, `old_text` mediumblob NOT NULL, `old_flags` tinyblob NOT NULL, PRIMARY KEY (`old_id`) ) ENGINE=InnoDB AUTO_INCREMENT=317 DEFAULT CHARSET=binary MAX_ROWS=10000000 AVG_ROW_LENGTH=10240 How should I use mysqldump to properly generate a backup for that database?

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  • Why does squid reject this multipart-form-data POST from curl?

    - by keturn
    This fails: $ curl --trace multipart-fail.log -F "source={}" http://127.0.0.1:3003/jslint With a squid status 417 error, ERR_INVALID_REQ. trace of failing curl request trace of successful curl request that uses urlencoding (curl -d) instead of multipart (curl -F) formatted version of squid's error message I've never had this in practice through a web browser, so it's probably curl usage instead of squid, but if I tell curl not to use the squid proxy, the web application on the other end accepts it just fine. (If there's a more appropriate StackExchange site for this, please let me know.)

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  • How to make a persistent acknowledgment in Icinga/Nagios?

    - by blerontin
    I am using Icinga (Nagios fork) to also monitor uptime of external hosts and services. Currently when looking at the "Critical" count I find it difficult to decide if an internal service is affected (I should take immediate action) or an external service (I just acknowledge the problem). Is there a way to keep a problem acknowledgement for future down-times of the checked host/service? Is there some way to auto-acknowledge the state change of external hosts/services?

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  • Virtual PC 2007 Full Screen Resolution

    - by Swami
    I have a laptop (1440 x 900) and an external monitor (1920 x 1200), and I'm running Virtual PC 2007. Initially, my VPC could not switch to fullscreen mode on my external monitor because the max resolution for VPC was only 1600 x 1200. I installed a hotfix (http://support.microsoft.com/kb/958162) and after the hotfix, I was able to view VPC in fullscreen mode on my external monitor, but now I'm unable to view fullscreen on my laptop. It says "please check that the resolution of the guest is not higher than that of the host". I even tried to decrease the resolution of my Virtual PC to less than than of my laptop, but it always resets it back up. So now after the hotfix, I can view fullscreen mode only when my external monitor is plugged in. Any way I can resolve this?

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  • Separate brightness/power-saving settings for multiple monitors

    - by MariusMatutiae
    At home, I connect my laptop to an external monitor. Under Linux X server, it works perfectly. Occasionally I watch a movie on the external monitor. When I do, I would like to fold the laptop shut, and just relax. This however triggers my settings for dimming the screen after 10 minutes of inactivity, which in turn extends to the external monitor. I know I could solve the problem by setting dimming to "Never", but this is a waste, causes the laptop to overheat, and is bad for the normal laptop use. How can I set the power saving/brightness specs for the external monitor, independently of the onboard one? I run Debian or Arch, under KDE.

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