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  • Load Balancing Linux Web Services and Change Config Without Restart

    - by Eric J.
    What options are available to load balance web service traffic on Linux with the ability to add or remove servers from the server pool without restarting the load balancer? This post: http://serverfault.com/questions/71437/mod-proxy-change-without-restart looks like a very promising way to switch between two servers, but I don't know enough about mod_proxy and mod_rewrite to understand how/if I can use an external file to specify the BalancerMember entries for a section. Are there other open source load balancers that support reconfiguration without restart?

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  • How to access original files from before a symlink gets updated, which have since been moved to another dir

    - by Luke Cousins
    We have a website and our deployment process goes somewhat like the following (with lots of irrelevant steps excluded) echo "Remove previous, if it exists, we don't need that anymore" rm -rf /home/[XXX]/php_code/previous echo "Create the current dir if it doesn't exist (just in case this is the first deploy to this server)" mkdir -p /home/[XXX]/php_code/current echo "Create the var_www dir if it doesn't exist (just in case this is the first deploy to this server)" mkdir -p /home/[XXX]/var_www echo "Copy current to previous so we can use temporarily" cp -R /home/[XXX]/php_code/current/* /home/[XXX]/php_code/previous/ echo "Atomically swap the symbolic link to use previous instead of current" ln -s /home/[XXX]/php_code/previous /home/[XXX]/var_www/live_tmp && mv -Tf /home/[XXX]/var_www/live_tmp /home/[XXX]/var_www/live # Rsync latest code into the current dir, code not shown here echo "Atomically swap the symbolic link to use current instead of previous" ln -s /home/[XXX]/php_code/current /home/[XXX]/var_www/live_tmp && mv -Tf /home/[XXX]/var_www/live_tmp /home/[XXX]/var_www/live The problem we are having and would like help with is that, the first thing any website page load does is work out the base dir of the application and define it as a constant (we use PHP). If then during that page load a deployment occurs, the system tries to include() a file using the original full path and will get the new version of that file. We need it to get the old one from the old dir which has now moved as in: System starts page load and determines SYSTEM_ROOT_PATH constant to be /home/[XXX]/var_www/live or by using PHP's realpath() it could be /home/[XXX]/php_code/current. Symlink for /home/[XXX]/var_www/live get updated to point to /home/[XXX]/php_code/previous instead of /home/[XXX]/php_code/current where it did originally. System tries to load /home/[XXX]/var_www/live/something.php and gets /home/[XXX]/php_code/current/something.php instead of /home/[XXX]/php_code/previous/something.php I'm sorry if that is not explained very well. I'd really appreciate some ideas on how to get around this problem if someone can. Thank you.

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  • glusterfs mounts get unmounted when 1 of the 2 bricks goes offline

    - by Shiquemano
    I have an odd case where 1 of the 2 replicated glusterfs bricks will go offline and take all of the client mounts down with it. As I understand it, this should not be happening. It should fail over to the brick that is still online, but this hasn't been the case. I suspect that this is due to configuration issue. Here is a description of the system: 2 gluster servers on dedicated hardware (gfs0, gfs1) 8 client servers on vms (client1, client2, client3, ... , client8) Half of the client servers are mounted with gfs0 as the primary, and the other half are pointed at gfs1. Each of the clients are mounted with the following entry in /etc/fstab: /etc/glusterfs/datavol.vol /data glusterfs defaults 0 0 Here is the content of /etc/glusterfs/datavol.vol: volume datavol-client-0 type protocol/client option transport-type tcp option remote-subvolume /data/datavol option remote-host gfs0 end-volume volume datavol-client-1 type protocol/client option transport-type tcp option remote-subvolume /data/datavol option remote-host gfs1 end-volume volume datavol-replicate-0 type cluster/replicate subvolumes datavol-client-0 datavol-client-1 end-volume volume datavol-dht type cluster/distribute subvolumes datavol-replicate-0 end-volume volume datavol-write-behind type performance/write-behind subvolumes datavol-dht end-volume volume datavol-read-ahead type performance/read-ahead subvolumes datavol-write-behind end-volume volume datavol-io-cache type performance/io-cache subvolumes datavol-read-ahead end-volume volume datavol-quick-read type performance/quick-read subvolumes datavol-io-cache end-volume volume datavol-md-cache type performance/md-cache subvolumes datavol-quick-read end-volume volume datavol type debug/io-stats option count-fop-hits on option latency-measurement on subvolumes datavol-md-cache end-volume The config above is the latest attempt at making this behave properly. I have also tried the following entry in /etc/fstab: gfs0:/datavol /data glusterfs defaults,backupvolfile-server=gfs1 0 0 This was the entry for half of the clients, while the other half had: gfs1:/datavol /data glusterfs defaults,backupvolfile-server=gfs0 0 0 The results were exactly the same as the above configuration. Both configs connect everything just fine, they just don't fail over. Any help would be appreciated.

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  • USB sticks optimized for OS booting and virus removal [closed]

    - by Rupert
    I'm looking to buy some usb sticks which will mainly be used in tech support for the purposes of removing viruses and booting up various OS's. Therefore, I am looking for the following features: Write protected switch (so that they may be safely plugged in to potentially infected machines) As fast as possible (so that loading, for example, a windows recovery, doesn't take forever) At least 4GB in size Any other features that might be useful for the above purpose Price is no object but, of course, the cheaper the better.

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  • How to recover Google classic design from its new design?

    - by Steven
    I typed this into my address bar: javascript:void(document.cookie=”PREF=ID=20b6e4c2f44943bb:U=4bf292d46faad806:TM=1249677602:LM=1257919388:S=odm0Ys-53ZueXfZG;path=/; domain=.google.com”); However, I don't like the new design of Google. How to switch back? How to cancel this effect using Javascript? How to reverse by using Javascript?

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  • Slash after domain in URL missing for Rails site

    - by joshee
    After redirecting users in a Rails app, for some reason the slash after the domain is missing. Generated URLs are invalid and I'm forced to manually correct them. The problem only occurs on a subdomain. On a different primary domain (same server), everything works ok. For example, after logging out, the site is directing to https://www.sub.domain.comlogin/ rather than https://www.sub.domain.com/login I suspect the issue has something to do with the vhost setup, but I'm not sure. Here are the broken and working vhosts: BROKEN SUBDOMAIN <VirtualHost *:80> ServerName www.sub.domain.com ServerAlias sub.domain.com Redirect permanent / https://www.sub.domain.com </VirtualHost> <VirtualHost *:443> ServerAdmin [email protected] ServerName www.sub.domain.com ServerAlias sub.domain.com RailsEnv production # SSL Engine Switch SSLEngine on # SSL Cipher Suite: SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL # Server Certificate SSLCertificateFile /path/to/server.crt # Server Private Key SSLCertificateKeyFile /path/to/server.key # Set header to indentify https requests for Mongrel RequestHeader set X_FORWARDED_PROTO "https" BrowserMatch ".*MSIE.*" \ nokeepalive ssl-unclean-shutdown \ downgrade-1.0 force-response-1.0 DocumentRoot /home/usr/www/www.sub.domain.com/current/public/ <Directory "/home/usr/www/www.sub.domain.com/current/public"> AllowOverride all Allow from all Options -MultiViews </Directory> WORKING PRIMARY DOMAIN <VirtualHost *:80> ServerName www.diffdomain.com ServerAlias diffdomain.com Redirect permanent / https://www.diffdomain.com </VirtualHost> <VirtualHost *:443> ServerAdmin [email protected] ServerName www.diffdomain.com ServerAlias diffdomain.com ServerAlias *.diffdomain.com RailsEnv production # SSL Engine Switch SSLEngine on # SSL Cipher Suite: SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL # Server Certificate SSLCertificateFile /path/to/server.crt # Server Private Key SSLCertificateKeyFile /path/to/server.key # Set header to indentify https requests for Mongrel RequestHeader set X_FORWARDED_PROTO "https" BrowserMatch ".*MSIE.*" \ nokeepalive ssl-unclean-shutdown \ downgrade-1.0 force-response-1.0 DocumentRoot /home/usr/www/www.diffdomain.com/current/public/ <Directory "/home/usr/www/www.diffdomain.com/current/public"> AllowOverride all Allow from all Options -MultiViews </Directory> </VirtualHost> Please let me know if there's anything else I could provide that would help determine what's wrong here. UPDATE tried adding a trailing slash to the redirect command, but still no luck.

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  • Starting programs from terminal then exiting terminal exits started programs?

    - by sherrellbc
    I really was unsure how to phrase the question title. What I mean is that when I use the terminal to start a program, most of the time when the terminal is closed it also exits the programs started from it. Now this makes sense if we look at it from a hierarchical standpoint of the terminal being the parent process which spawns child processes, and any halt of the parent causes subsequent halting of the children as well. However, I've noticed this to not always be the case. For example, I downloaded Sublime Text Editor and created a symlink in PATH. I can start this program by issuing a sublime command from the terminal, but subsequent closure of the terminal program does nothing to sublime. However, other times either the child process that was started it also closed or it hangs up and causes problems. tl;dr: Is it always the case that programs started from a closed parent process will be closed when the parent is exited? And if so, is there way to start a program from the terminal and then close the terminal without exiting the started process? The whole point here is to start programs from the terminal so I do not overly-populate my desktop with symlinks.

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  • In APC+PHP, how much RAM is too much? Is it okay to set apc.shm_size to many GB?

    - by Jeremy Clarke
    On our server we have a LOT of RAM for our traffic levels (16GB). The HTTP processes regularly eat up all CPU and need to be restarted without even getting close to using swap memory, so I'm looking for ways to spend RAM to ease the load on Apache (and/or help the seperate MySQL server which may be breaking Apache). I have many WordPress installs on the HTTPD instance so APC sometimes uses as much as 900MB of ram (according to the apc.php charts). Just in case I have apc.shm_size set to 1600MB which is more than it needs but not more than I can spare. This means there is usually lots of extra RAM available to APC but also very little turnover and fragmentation is never more than 1%. Is this dangerous? Should I be slimming down APC to less than 1GB just on principle? Should I be expecting some turnover within APC in the name of bringing it's overall footprint down? Having so much memory devoted to APC means that in top/htop every single httpd process shows ~1.9GB in the VIRT memory column. Obviously this is shared memory and not used per-process, but could it be hurting our server? NOTE: The problem with the server remains unclear but the effect is that about 60 times a day all 8 CPU's fill up to 100% and everything stops working until Monit sees that Apache is broken and restarts it (Monin also saves the MySQL server). I'm not sure if APC is even part of the problem but I'm trying to optimize everything just in case.

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  • Chrome Open in New Tab/Window Menu Items

    - by Aequitarum Custos
    The problem is, both Firefox and Internet Explorer have "Open in New Tab" as the second option. This has become muscle memory for me by now, to the point that I don't use as often as I want to, solely because I can't open a page in a new tab without thinking about it. Is there a way to switch the position of "Open Link in new tab" and "Open link in new window", so that I can resume browsing as normal, or am I cursed by this user interface design nightmare by Google?

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  • Is there a standard method for assigning nameservers to servers in a Windows domain?

    - by HopelessN00b
    As the title asks, I'm wondering if there's any standard or "best practice" for how to actually assign nameservers (DNS) and manage the nameserver configuration for client servers on a Windows domain. I'm talking about the setting circled in the below image, in case the language of the question is not clear enough: This is for a large, multi-site environment, where ideally/hopefully all servers point at their site's Domain Controller as the primary DNS server, and a DNS server at a different site as the secondary DNS server. For simplicity's sake, we can say that the secondary server would be the Domain Controller at the home site for everyone, and there are no tertiary DNS servers (even though that's not actually the case). Try as I might, I can't seem to find a GPO setting for this (at least on FL 2003 R2, the Computer Configuration - Administrative Templates - Network - DNS Client - DNS Servers GPO is Supported on: Windows XP Professional only), and I find it rather hard to believe that the "best"/"standard" solution would therefore be either scripting up something to apply the DNS settings per site, or using a DHCP server to push those configurations out to the other servers via the DHCP Scope Options. So, is there a standard way of managing this configuration? (That's hopefully not "a script" or "DHCP Scope Option.)

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  • Media disconnected Acer Aspire Win 7 Starter

    - by RoadGlide
    Problem setting up wireless connection on my new ACER Netbook using Win 7 Starter. Works fine with LAN cable from NETGEAR WGT624V3 router with updated firmware. The NETGEAR does not see the ACER, but does see my XP Laptop. I'm also running a wireless, BlueRay DVD. When I run getmac I get hardware not pesent, my mac address, Hardware not present. Is there a switch that needs to be set?

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  • The plugin of munin is always timed out

    - by haoX
    I want to use munin to make a graph of ttyACM0 in Linux, but munin can not create the graph. I found some information in "munin-node.log". it shows that "Service 'temperature' timed out". So I changed timeout to 60 or 120 in /munin/plugin-conf.d/munin-node, but it does not work. It's also timed out. Here is part of my code: if [ "$1" = "config" ]; then echo 'graph_title Temperature of board' echo 'graph_args --base 1000 -l 0' echo 'graph_vlabel temperature(°C)' echo 'graph_category temperature' echo 'graph_scale no' echo 'graph_info This graph shows the temperature of board' for i in 1 2 3 4 5; do case $i in 1) TYPE="Under PCB" ;; 2) TYPE="HDD" ;; 3) TYPE="PHY" ;; 4) TYPE="CPU" ;; 5) TYPE="Ambience" ;; esac name=$(clean_name $TYPE) if [ "$TYPE" != "NA" ]; then echo "temp_$name.label $TYPE"; fi done exit 0 fi for i in 1 2 3 4 5; do case $i in 1) TYPE="Under PCB" VALUE=$(head -1 /dev/ttyACM0 | awk '{print $1}') ;; 2) TYPE="HDD" VALUE=$(head -1 /dev/ttyACM0 | awk '{print $2}') ;; 3) TYPE="PHY" VALUE=$(head -1 /dev/ttyACM0 | awk '{print $3}') ;; 4) TYPE="CPU" VALUE=$(head -1 /dev/ttyACM0 | awk '{print $4}') ;; 5) TYPE="Ambience" VALUE=$(head -1 /dev/ttyACM0 | awk '{print $5}') ;; esac name=$(clean_name $TYPE) if [ "$TYPE" != "NA" ]; then echo "temp_$name.value $VALUE" fi

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  • Debug/step into a Linux boot

    - by bean
    Is there a way to watch Linux boot as though it was a program compiled with GCC on a Linux environment using the -g switch so, say, I can step through the entire boot sequence from GRUB onwards, choosing to step through at C source level or assembly when necessary/desirable, by using GDB or a GDB-like tool? I suspect it would require a virtual machine at least, to watch the boot on a host environment. Any elaboration on this topic of observing a boot would be appreciated!

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  • Failed none and iptables

    - by Michael
    The problem is that when I ssh to my host with putty and enter user name, after that the password prompt delays. Found this is directly related to my iptables and can solve by changing default policy to ACCEPT. If default INPUT policy is ACCEPT, then password prompt is coming immediately. Mar 13 00:05:01 server-ubuntu sshd[6154]: Connection from 192.168.0.10 port 26304 Mar 13 00:05:06 server-ubuntu sshd[6154]: Failed none for acid from 192.168.0.10 port 26304 ssh2 However, if default INPUT policy is DROP, I got slight delay in getting password prompt after I enter username Mar 13 00:07:12 server-ubuntu sshd[6177]: Connection from 192.168.0.10 port 26333 Mar 13 00:07:35 server-ubuntu sshd[6177]: Failed none for acid from 192.168.0.10 port 26333 ssh2 For the second case, I tried to set default policy for FORWARD and OUTPUT chains to ACCEPT, but it didn't help. The only rule in this case is: -A INPUT -i eth1 -m mac --mac-source 00:26:XX:XX:XX:XX -j ACCEPT 00:26:XX:XX:XX:XX is the mac address from which I am trying to ssh to server's LAN(eth1). I'm sure there has to be some rule, which I can use while default INPUT chain policy is DENY in order to get password prompt immediately. I realize that the error message in the log is something normal and part of some verification procedure.

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  • Black Screen After Sleep (Win 8)

    - by Mark
    I have an SSD only, Intel HD Graphics only, Ultrabook running on Windows 8 64-bit and after I turn it back on, after a long sleep of a few hours, the screen remains black even though the power is on (the fan and keyboard backlight are on). I have to force a shut down and switch it back on to use it normally again. Hibernation and hybrid-sleep are turned off. It comes out of sleep of less than an hour just fine. Any advise? Mark

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  • How can I add more Android home screens?

    - by LKM
    It seems my HTC Magic running Android 1.5 (Cupcake) has three home screens I can switch between. I can't find any kind of option to add additional home screens (the "home screen" menu only lets me add Widgets, Shortcuts and Folders or change the Wallpaper). Is there any way I can add more?

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  • How can I stop Excel from eating my delicious CSV files and excreting useless data?

    - by atroon
    I have a database which tracks sales of widgets by serial number. Users enter purchaser data and quantity, and scan each widget into a custom client program. They then finalize the order. This all works flawlessly. Some customers want an Excel-compatible spreadsheet of the widgets they have purchased. We generate this with a PHP script which queries the database and outputs the result as a CSV with the store name and associated data. This works perfectly well too. When opened in a text editor such as Notepad or vi, the file looks like this: "Account Number","Store Name","S1","S2","S3","Widget Type","Date" "4173","SpeedyCorp","268435459705526269","","268435459705526269","848 Model Widget","2011-01-17" As you can see, the serial numbers are present (in this case twice, not all secondary serials are the same) and are long strings of numbers. When this file is opened in Excel, the result becomes: Account Number Store Name S1 S2 S3 Widget Type Date 4173 SpeedyCorp 2.68435E+17 2.68435E+17 848 Model Widget 2011-01-17 As you may have observed, the serial numbers are enclosed by double quotes. Excel does not seem to respect text qualifiers in .csv files. When importing these files into Access, we have zero difficulty. When opening them as text, no trouble at all. But Excel, without fail, converts these files into useless garbage. Trying to instruct end users in the art of opening a CSV file with a non-default application is becoming, shall we say, tiresome. Is there hope? Is there a setting I've been unable to find? This seems to be the case with Excel 2003, 2007, and 2010.

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  • Replacing the LCD panel in a netbook (Asus Eee PC 1005)

    - by neilfein
    Yesterday, I was cleaning up and dropped my Asus Eee 1005PE. The screen is cracked inside (i.e., cracks are visible only when on), and no longer works properly. I booted up with another monitor attached, and the computer itself is fine, but needs a new screen. Best Buy wants at least $250 to repair it (that includes their $150 fee to breathe in the same room as the unit), and Asus was of no help at all. (They're incredibly cagey and won't provide any money numbers at all, not even the cost of the part.) If replacing the LCD is no more trouble than replacing memory or a hard drive, I can do that. It's within my means to buy the part (18G241010402, a TFT LCD), but I'd like to know more about the procedure involved. My question: How does one replace the screen in this unit? Do I simply open the case and swap out the unit, or do I need to disassemble anything else to get to the screen? I don't want to order the part and then end up in a situation like this. Is the case screwed shut, or is it like an iPod where they glue things closed? I know enough about my abilities with a soldering gun to not attempt to solder tiny wires, would any of that be involved?

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  • Default setting for dual monitors (using Win+P)

    - by Tomek
    I have two displays (one monitor and one TV) connected to my card via DVI. I switch between them with Win+P (when I'm using XBMC I set "only projector"). Most of the time, I use it during late hours, so I just turn off the PC (with XBMC's option "shutdown") and go to sleep. All fine, but on the next day my display is changed (to "only projector"). Bottom line is - how can I set my Windows 7 to have "only monitor" each time system boots?

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  • Could a HomePlug be used to connect 2 routers?

    - by tigermain
    I have 2 routers that I would like to connect together (they are wireless but dont have an AP mode) could I simply buy a pair of homeplugs and connect them in order for all machines to have complete visibility of each other?! The DHCP will only be enabled on one, so the other will simply be acting as a switch

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  • Internet connection problem,ping ok , but outlook and browsers dont work

    - by Ashian
    Hi, From some days ago I have a big problem on my laptop( run windows xp sp3) When I connect to internet I can ping web sites but when try to browse them some times it work correctly and some times the connection to server intrupted and I have to refresh the page several times. in this case browser show a connection problem immediatly after I click on address bar or a link on page( wihtout any try to connect to server) I use FireFox and opera and both of them have this problem. try another ISP and still I have this problem. I didnt use any proxy server and check the proxy setting. In this case Outlook also can't connect to mail server. this problem anfter some time or after restart windows have been fixed for a while. I check for virus and can't find anything. Is there any idea how can I fix it? UPDATE: Thanks for your responses. I test them , also I use Open DNS setting and that dosent help me. last night I see that my local web application ( such as Adsl modem config web site , and sites that I set up on windows xo IIS ) aslo can't open and Internal Communication error apears ( Opera Message) that didnt relate to DNS settings or Internet connection.

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  • Is CloudLinux considered to be a stable webserver

    - by Saif Bechan
    I am currently running several websites on a CentOS 5.4 system. I have the choice to switch to Cloudlinux. It is said to be better at handling several websites. Does anyone have any information to share on CloudLinux. This can be on security, stability and just overall performance of the system.

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  • DNS: Forward domain to another host

    - by normmcgarry
    I was hoping some expert on here could quickly answer my question. I don't know much about DNS, so bare with me. I have a domain that is hosted with XO Communications. I want to host that domain at another web host, but I want to keep the mail at XO, so I'd like to keep the DNS managed by XO. What do I need to do in the DNS to switch it the website to the other host, but leave the mail unchanged? Thank you so much.

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