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• CentOS only detecting 50% of ram

  - by Devator

  I have 16GB ram in my machine. Before, free -m outputted the normal 16 GB ram, however now (after a reboot) it only detects 8 GB ram. Is one ram module damaged? grep -i memory /var/log/dmesg outputs Memory: 15621184k/16017200k available (2535k kernel code, 387120k reserved, 1748k data, 196k init). (Which looks like 16 GB to me). Free -m outputs: total used free shared buffers cached Mem: 7484 7415 68 0 6104 524 -/+ buffers/cache: 786 6697 Swap: 2055 0 2054 Anything I might be missing? Thanks in advance.

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• MySQL - Why would SHOW SLAVE HOSTS cause a binlog dump?

  - by Rory McCann

  We're getting loads of binlog files in our MySQL 5.0.x. We have a normal master/slave replication thing going with 1 master, 1 slave. Looking at /var/log/mysql.log, nearly 90% of the time the replicator connects and does a SHOW SLAVE HOSTS causes a bin log dump. For example: 7020 Query SHOW SLAVE HOSTS 7020 Binlog Dump Log: 'mysql-bin.029634' Pos: 13273 However when I do a SHOW SLAVE HOSTS on the mysql myself, I get no results. Occasionally when the replicator does a SHOW SLAVE HOSTS, mysql will hang for hours. I see nothing in the /var/log/syslog at the same time... What's going on here? How can I debug this more? For the record the MySQL master and slave servers are ubuntu dapper.

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• How to interpret output from Linux 'top' command?

  - by Ali

  Following a discussion made HERE about how PHP-FPM consuming memory, I just found a problem in reading the memory in top command. Here is a screenshot of my top just after restarting PHP-FPM. Everything is normal: about 20 PHP-FPM processes, each consuming 5.5MB memory (0.3% of total). Here is the aged server right before restart of PHP-FPM (one day after the previous restart). Here, we still have about 25 PHP-FPM with double memory usage (10MB indicating 0.5% of total). Thus, the total memory used should be 600-700 MB. Then, why 1.6GB memory has been used?

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• Debug Apache mod_status showing 151 requests/sec - 2.7 GB/second

  - by James Hackett

  One of my web servers went crazy this morning and showed "151 requests/sec - 2.7 GB/second - 140.7 MB/request" the normal is like "11.1 requests/sec - 65.6 kB/second - 5.9 kB/request" I don't even think that kind of through put is possible on my server. It was also listing odd symbols for the urls and the amount of data transfered for connections was off the meter 246-0 -1286402072 0/0/0 ? 0.00 -1444841118 0 -5416403825852416.0 0.00 0.00 °Rk³ 247-0 18 0/0/0 ? -13112985.76 2094967848 0 -5428200825946112.0 0.00 0.00 248-2 23437 0/0/2 _ 0.00 0 0 0.0 0.00 -5340330065920.00 74.53.23.134 web2.mydomain.com OPTIONS / HTTP/1.0 249-2 23279 0/2981898840/0 W 16673317.60 11 0 0.0 2844.06 0.00 201.144.221.245 www.mydomain.com GET /cb8ff49a2395a7b1accbbce1e4cf164f/view/256 HTTP/1.1 250-0 0 40600/3009863336/0 ? 3816369.92 910209710 0 2913775.3 -5323551899648.00 -5324315849947.28 èøϲ Has anyone seen anything like this before and know what might be causing it? I posted the full mod_status output here http://pastie.org/916066

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• how to best config for synflood setup in csf but web response still fast

  - by Binh Nguyen

  my server down random every day 4-5 time cause get high load very quick.. I have install csf and with some config server now stable.. load around 5. BUT the big isuse is : the real user very hard to access website specially from IE browser you can test at xaluan.com the flowing is config using in csf: SYNFLOOD = "1" SYNFLOOD_RATE = "100/s" SYNFLOOD_BURST = "10" CONNLIMIT = "80;30" PORTFLOOD = "80;tcp;70;5" CT_LIMIT = "29" # other config may same as default i playing around with this config for a week but still not work around.. If increase the rate SYNFLOOD_RATE = "140/s" or more.. the website response very fast.. be side have bad effect of server load increase so fast normal 20 and may be up to few hundred in peck time .. my need is response time fast but load still low.. please help thanks ps: server runing nginx frontend, apache, mysql, php ,, the home page has around 70 elements which will cached in browser in fist time access..

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• Why aren't connections released by the tomcat AJP connector

  - by Chris

  I have here a jboss with a web application. The tomcat is configured to use the ajp connector. Incoming connections are tunneled via an apache reverse proxy to the connector. Now I recognized that under heavy load the connector keeps a bunch of connections in "keep alive" mode for eternity and doesn't release them any more. With the normal HTTP connector the app did well, but now with the ajp connector we have regular app stallments. Can someone give me some advice where to start to look to resolve this issue? Why does the connector not release the connection again after idling for 300 secs? thanks, chris

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• Manage Upload Permissions, SFTP & Linux

  - by John R

  I'm new to Linux. I am working with a Redhat 5.5 server and am using a Java-based SFTP script that will allow multiple users to upload text files to a server. I am undecided if each user will have a separate directory or if I will use a naming convention that includes their customer ID. The files include some personal information about their LAN settings, so I prefer to use SFTP as apposed to FTP. It is my understanding that SFTP is encrypted (Also, I have a Java class configured to upload via SFTP, so I prefer not to switch protocols unless their is a very-good reason). The prototype is for a system that will support large numbers of customers and the thought of continually adding and removing clients through the command line seems highly impractical. (Again, I am new_to/learning Linux and Redhat). What are normal conventions for giving multiple users permission to SFTP upload files with a unique username and password for each.

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• Wireless networking on Gnome on Ubuntu 9 / 10

  - by WaveyDavey

  So here's my problem: I have some netbooks (ASUS eee, and ACER Aspire Ones) that I've been tasked to set up as kiosk machines, locked up tight for normal users. I am a command-line, server man, so this gnome malarkey is all a bit new to me. I found a lovely 9.04 kiosk livecd that installs and runs exactly as I want it to, but I can't get the wireless working. So I dropped on a full 10.4 distro, and wireless works straight out of the box (so hardware is good) - all I needed to do was right-click on the network connection icon, enter my SSID and password (WPA/WPA2) and away it went, perfect. Further investigation on 10.4 distro shows that /etc/networking/interfaces is virtually empty (just auto lo iface lo inet loopback in it), even after I have set up the wireless thru the gnome taskbar applet (is that the right word?). So where does gnome / ubuntu store the network settings to bring the blasted wireless connection up, and what do I need to do on the kiosk version to get wireless running?

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• Does Office365 for education have litigation hold? [closed]

  - by Neobyte

  Both Google and Microsoft fail me, so I'm hoping someone out there with an O365 education deployment (A1 or A2) could help. Do the education plans have options for litigation hold? What's the per-head cost? I find plenty of people asking this question but noone definitively answering it. I know the normal enterprise offerings support litigation hold, but I can find nothing on the education offerings. I'm concerned only with staff. If at all possible, a link to an online reference would be handy too. Many thanks!

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• AMD Phenom 2 is idling at 50°C, can I get it cooler?

  - by liam

  Is it possible to damage a CPU so that it works, but only at high temperatures? My Phenom 2 1090T is idling at 50°C and I have tried everything to get it down. I can play Deus Ex HR, Arkham City, or Dirt 3 and it hovers around 60. I have cleaned out all my fans: 2 intake (front and side), 1 exhaust (Arctic Freezer). My machine is a brand new Antec 520 high current gamer. Also: Extreme3 770 8 GB Kingston DDR3 (2x4 GB) 750 GB Seagate Barracuda ASUS Xonar DG Radeon HD 5670 New Arctic Freezer Pro Rev 2 (days old and mounted properly with Arctic Silver 5). I also dropped an Athlon 250 dual core into my rig and that ran at under 30. Is the CPU dying? I know that 50°C idle for an AMD is not normal.

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• Apache SSL Log Incomplete SSL Handshake

  - by Raymond Berg

  Scenario: We're running some experiments in our classroom around trusted connections and SSL, and I want to demonstrate the SSL handshake request on a man-in-the-middle attack. I have an Apache server with a self-signed cert. Everything works fine, but the logging seems incomplete as there is no way to get a list of SSL attempts. Once the client accepts the 'exception', I get normal access log messages for every request. However, I need to know what ssl request caused it to fail. Here are my log directives: LogLevel warn ErrorLog logs/ssl_error_log CustomLog logs/ssl_access_log combined #the combined is your average custom log My desire is a list of every SSL handshake attempted. What am I missing that could produce something like the following? (Obviously the exact words aren't needed, but in the ballpark) 0/0/0 00:00:00 - 192.168.1.10 - hijk.lmnop.edu - SSL Mismatch

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• PIN based Login in Windows 8.1 Missing

  - by WiredPrairie

  I installed a fresh copy of Windows 8.1 Pro using Hyper-V, and updated with all updates via Windows Update. It's not domain joined. I cannot however activate a PIN based login for the installation and I'm not sure why. I'm using a Microsoft account to login (not just a local login). I have even manually enabled the feature using group policy (which apparently only should have mattered for a domain joined workstation anyway), rebooted, and it's still not available. As far as I can tell, everything else seems normal and is working as expected. For Sign-in options, I only see Password as a choice:

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• How do I stop apps trying to use a dial-up connection?

  - by ProfKaos

  Every now and again, I might have to use a dial-up internet connection via another tethered phone, i.e. Bluetooth connection to the GPRS modem. Now I am back on 'ops normal', i.e. using a shared internet connection on my own phone, or on my 3G stick, but some apps, especially IE9, keep popping up a 'dialup connection' dialogue, which I cannot dismiss enough times ever, to make to stay away. How can I tell these idiot applications that I no longer need a dial-up connection?

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• Exchange 2010 - No Push notification when when deleting emails from Outlook

  - by ThinkTank

  Hi I'm setting up a Exchange 2010 server for our test environment. I'm running Windows 2008R2 enterprise on this machine. Iv'e also installed all updates available for windows and exchange 2010 including rollup 1 and 2 for exchange that include bugfixes regarding push notifications. My problem is when deleting mail or marking mail as read don't trigger a push notification. The happens when I use webgui, mobile phone and Outlook 2007. When deleting a email in Outlook 2007 the changes get sent to the server since the changes are visible in webgui but not on mobile phone. I get push notifications when I get new emails since new emails appear instantly on the mobile phone. Is this normal behaviour on Exchange 2010? For me it seems a bit funny. If i force sync on mobile phone the changes appear. Iv'e tested this on both iphone and HTC HD2(Running Windows Mobile 6.5) with same results.

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• How to install Mac OS X from Windows without a CD

  - by John Smith

  I have two partitions, one for windows the other for Mac OS X. Recently, my Mac OS X crashed and my partition rendered unbootable. When I insert Mac OS X's installation CD everything seems normal from startup, to choosing whether to boot from Windows or CD, until the CD boots. The screen flickers and it becomes extremely dark can barely see anything but I can see that it is booted correctly. I tried increasing brightness but that did not work. After hours of trying to read what is on the screen and guessing where to click the installation did not go through... It took more than a couple of hours so I restarted. Now the partition is accessible through Windows but is not bootable. TL;DR Is it possible to install Mac OS X on a visible partition without the CD through Windows XP?... Thanks

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• SLES 11 - ocfs2 - Locking does not appear to work

  - by Autobyte

  Hi I have two SLES 11 servers that are SAN attached to a Clarion CX-340. The SAN partition has been formatted with ocfs2 and I have both machines setup in a cluster and the cluster is running (all appears to be normal). I have a small java application as a locking test and when I run the application on both machines at the same time, I should get the lock on one server and the other should refuse the lock since the first already holds a lock on that file but in this case both servers get a lock on the same file. Basically my cluster.conf looks like this: node: ip_port = 7777 ip_address = 192.168.10.121 number = 1 name = osrsles10node1 cluster = osrsles10 node: ip_port = 7777 ip_address = 192.168.10.122 number = 2 name = osrsles10node2 cluster = osrsles10 cluster: node_count = 2 name = osrsles10 Please ask for any other info - I really need these locks to be exclusive to each server. Thanks.

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• Server Security

  - by mahatmanich

  I want to run my own root server (directly accessible from the web without a hardware firewall) with debian lenny, apache2, php5, mysql, postfix MTA, sftp (based on ssh) and maybe dns server. What measures/software would you recomend, and why, to secure this server down and minimalize the attack vector? Webapplications aside ... This is what I have so far: iptables (for gen. packet filtering) fail2ban (brute force attack defense) ssh (chang default, port disable root access) modsecurity - is really clumsy and a pain (any alternative here?) ?Sudo why should I use it? what is the advantage to normal user handling thinking about greensql for mysql www.greensql.net is tripwire worth looking at? snort? What am I missing? What is hot and what is not? Best practices? I like "KISS" - Keep it simple secure, I know it would be nice! Thanks in advance ...

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• How to tell X.org to reload input device module? (Working around suspend-to-ram crash on Acer laptop

  - by Vi

  When X.org boots up, Synaptics touchpad works well. But when I remove the module it falls back to /dev/input/mice and don't use normal driver even when touchpad is available again. Xorg.0.log: ... (II) XINPUT: Adding extended input device "Synaptics Touchpad" (type: TOUCHPAD) (--) Synaptics Touchpad: touchpad found # { rmmod psmouse && echo mem /sys/power/state && modprobe psmouse; } (WW) : No Device specified, looking for one... (II) : Setting Device option to "/dev/input/mice" ... How to tell X.org to try it's InputDevice again (without restarting X server)? P.S. rmmod psmouse is needed to prevent crashing of Acer Extensa 5220 when resuming from suspend-to-ram. Update: Found answer myself: Doing xinput set-int-prop "Synaptics Touchpad" "Device Enabled" 8 1 after reloading the kernel module reloads touchpad. Now suspend-to-ram works OK.

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• Adding multiple gradients to object in Adobe Illustrator

  - by Vass

  Hi, I have an object which is a path (a nose to be specific). Now I want both a linear gradient and a radial gradient to be added to the object. So these must be separate gradient objects I guess, and I can't find a way to add multiple separate gradients to a complete path so do I duplicate the object and then apply a new gradient to each object? And what would the layer transparency features look like? Would the 'normal' overlay of the layers work? I am afraid of multiple shadows creating double dark regions, but maybe that is as its supposed to be if you think in terms of classical art and draw shadows in terms of each light obstruction.

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• Laptop battery liftime from Dell specs?

  - by user26535

  Question: When I buy a Dell Laptop, I get the following choice for battery: (Lithium-Ion main battery with X cells and Y Wh [included in price/at additional $] Lithium-Ionen-Hauptakku mit 4 Zellen und 24 Wh [Im Preis enthalten] Lithium-Ionen-Hauptakku mit 9 Zellen und 85 Wh [zuzgl. CHF 120.01] Lithium-Ionen-Hauptakku mit 6 Zellen und 46 Wh [zuzgl. CHF 30.00 I figured that I can calculate that a 86 Wh offers +254% of the 24 Wh lifetime, but... Is there any way to calculate to what battery time this amounts in hours ? I mean how many hours will the 24 Wh last (at normal operation - eg. writing a document - not watching video), else the +254% is a pretty useless number... Also anybody knows whether 4 cells means 4 times 24 Wh, or 24 Wh in total?

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• Corrupt file indicative of corrupt hard drive?

  - by Elipsicon

  I have noticed that two files on my (almost full) 2 TB hard drive have been corrupted. One file has 20 kB (!) corrupted, i.e. consecutive 20 kB have changed, even though the modification date of the file hasn't changed and I haven't worked with this file for over a year. This tells me that something "below" the file system level has messed with the data and the only thing I can think of is hardware failure, most likely hard disk failure. I've tested my RAM already and it works flawlessly. I'm using ext4 on Linux, if that is of any help. Is this normal? Is it time to change my hard drive disk before something worse happens? What can I do to prevent that from happening in the future? Is there some built-in feature of, or extension to ext4 that includes additional error correcting code and/or watches files for changes that haven't been caused by the OS?

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• DLP projector has odd colors

  - by torbengb

  At my place of work, we have several different video projectors, but they all use DLP technology, and the colors are wrong: for instance, yellow looks more like green, and all other colors are similarly distorted. Any kind of presentation or collaborative work is hindered by these wrong colors. On the laptop screen, the colors are fine but on the projector (hooked up via normal short VGA cable, and showing the same image at the same time), the colors look wrong. This is not about one specific projector or one specific laptop; it seems that any combination of projector + laptop has the exact same problem. Someone said that DLP is poor technology, but that's not true. I'm using a DLP projector at home (regular PC connected via HDMI) and the colors are excellent. Still, there's some kind of curse on the machinery at work. How can we get decent colors?

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• Pure-FTPd linux upload problems - 500 Unknown command

  - by user1801273

  I'm running Centos with Kloxo CP and PureFTPd on VPS based on HyperVM. The problem - during the day, there are periods when FTP wors fine for hours, but sometimes it dies with "500 Unknown command" code. for files larger than 2Kb. This is really weird - with files less than 2472-2484 bytes everything would work fine, but with bigger files ftp would start writing file, would drop on 2Kb and would return "500 Unknown command" . This happens on Passive AND/OR Active connections for any filetypes. Logs are showing like the file was uploaded successfully , but the speed nearby the action would be 0.3 -0.5 Kb , when normal operation would report 70-150Kb/s speeds. I do have some Iptables firewalls on both HyperVM host,and VPS , however these are static, and most of the time it works just fine. Any suggestions on where to look for a solution would be appreciated :)

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• Is it possible to rate-limit an scp/sftp/rsync/etc transfer from the command-line? ie, manual QoS on

  - by warren

  Specifically, I am looking to rate-limit an scp or sftp session (or other arbitrary network call) in the call itself. For example, let's say I want to copy 100MB to one server, and 1GB to another. I'd like to be able to run both of these at the same time, but maintain a QoS for "normal" computer usage - somewhat similar to how you can rate-limit bittorrent. Is there a way to do this without touching the networking hardware? I'm envisioning something akin to: magic-qos-tool 'scp file user@host:/path/to/file' Or.. scp -rate 40kbps file user@host:/path/to/file

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• Can't figure out how to make Slitaz USB persistent

  - by Dennis Hodapp

  I installed Slitaz on my USB. However I can't figure out how to make it persistent automatically. There are different sources telling me different ways to make it persistent. One told me to add "slitaz home=usb" to the syslinux.cfg file like this: append initrd=/boot/rootfs.gz rw root=/dev/null vga=normal autologin slitaz home=usb but it didn't work for me. http://www.slitaz.org/en/doc/handbook/liveusb.html gave an example of how to do it manually but I didn't try it and I also want it to happen automatically. custompc.co.uk/features/602451/make-any-pc-your-own-with-linux-on-a-usb-key.html is an older article that also explains how to make the USB persistent but I don't want to try it cause it looks outdated (from 2008) does anyone know the best way to make the USB automatically persistent?

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