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• Photo managing software that supports network drives?

  - by musicfreak

  My dad is a photographer in his free time, and he's been using Lightroom to manage his photos. However, recently, we put all of our photos on a NAS drive to allow us to access them from any computer at any time. The problem with this is that Lightroom cannot load catalogs from network drives. We need support for network drives because we'd like to be able to browse the photos from any computer, and for any computer to be able to add photos to the collection. Right now we're just syncing the Lightroom catalog file between us, but the extra step is a pain, and doing it manually makes it error-prone. Is there any software (free or commercial) that has proper support for network drives? The only real feature I need is to be able to sort photos by date and by some sort of tags. I don't need any editing features like those found in Lightroom; my dad is comfortable using Photoshop to edit photos. Also, if there is another solution to this that I haven't thought of, feel free to share.

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• Host multiple domains with Apache on a VPS

  - by Kunal

  Hi I have recently bought a windows VPS and installed apache, mysql using xampp. All services are running fine. I can access the hosted site using the IP of VPS but what I need to do is host multiple domains on that server. Actually my requirement was to use htaccess on a php based site but the site had to access data from ms sql server as well. So needed to enable php_mssql.dll in the php.ini which no shared hosting was supporting. Had to go for this VPS. Plesk was installed by default but as htaccess wont work with IIS, I had to stop IIS service and install apache there. Now all is well, but I need to find a way to host multiple domains there. When I bought the VPS they hosting people sent me the dedicated IP of the server and also I have the 2 name servers required to host domains. What is the next step? Exactly which file I need to modify to get things done? Please help! Any kind of help is much appreciated. Thanks in advance for all of your kind help and time.

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• Finding matching columns in excel

  - by fakaff

  I've never used excel before so I need the simplest solution available, and this is a work assignment due this week so I didn't have time read much of the documentation. Basically, I have two tables, A and B, and they are both thousands of rows long. Description of my task: right now (since I don't know better) I'm manually doing this: Go to row i in table B. Select entries in columns B(a, b, c) of that same row. Look for a row in table A where column A(b) matches row B(a). Paste the entries of columns B(a) of row i at the end of the row found in the last step. Repeat for row i + 1. Example: row B(cat, dog, mouse) matches A(mammal, cat, Mr. Whiskers). So I would paste B after A and have A(mammal, cat, Mr. Whiskers, cat, dog, mouse). Note: I am not joining tables. I am merely extending table A by pasting row A(b) if row A(b) matches row B(a). Also, sometimes entries are spelled slightly differently. Using wildcards to search for candidates would be of help. As the description should let on, this task is very tedious and inefficient if I don't know how to automate some operations (there are thousands of entries). Any quick tips as to how to be more productive is a big help.

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• GNU screen, how to get current sessionname programmatically

  - by Jimm Chen

  [ This can be considered step 2 of my previous question Is it possible to change GNU screen session name after created? ] Actually, I'd like to write a script that can display current screen session name and change current session name. For example: sren armcross It will change the session name to armcross (ARM gcc cross compiler) and output something like: screen session name changed from '25278.pts-15.linux-ic37' to 'armcross' So, the key question now is how to get current session name. Not only for display the old session name, but according to Is it possible to change GNU screen session name after created? , I have to know it(pass to -d -r) before I can change it to something else. Can we use $STY for current session name? No. $STY will not change after you have changed the session name to a user-defined one. However, for command screen -d -r <oldsessname> -X sessionname armcross should be the user-defined name(if ever defined) instead of $STY, otherwise, screen spouts error "No screen session found." Maybe, there is a verbose way, use screen -list to list all sessions(user-defined name listed), then, match the pid part from $STY against those listed sessions and we will find current session's user-defined name. It should not be so verbose for such a straightforward question. Don't you think so? The -d -D and -r -R options seems to expose too much implementation detail to screen's user. It seems, to rename a session, you have to detach it, then do the rename, then reattach it. Right? My env: opensuse 11.3, GNU screen 4.00.03 (FAU) 23-Oct-06 Thank you.

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• Internet Problem: Wireless connected but no connection to internet

  - by Josh K

  Hey i have a interesting network setup on a laptop here and for some reason the internet isnt working. I am connected to a secure network via wireless router and taskbar says i am connected and with good signal strength but in my internet browser i cant connect to any websites, the error is: This webpage is not available. (Chrome) I am using Chrome, but websites dont work on IE either. Heres a little background on the setup i have. I have a Ethernet connected to the laptop with a static ip, and then i have the wireless setup with DHCP enabled. I am using the ethernet to connect to the network (for remote desktop) but the wireless for internet (to avoid the network firewalls). this set up has worked fine for a few months, but i cant figure out what is going on now. Might be worth it to note it is a Lenovo Thinkpad and i just uninstalled ThinkVantage Access Connections (as it was giving me ample problems prior to this one, which i consider a step up) Tried repairing connection as well, let me know if you guys have any ideas please! EDIT: Solved-Dead Modem in the server room.... Sorry guys didn't have access to that myself

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• ssh-add insists on passphrase

  - by Sam Walton

  I have a new ssh key problem. I have successfully used them for years with Heroku, Git and other servers so I can login without having to issue a passphrase. A few weeks ago, I was unable to push a git repository on my machine to my Heroku and it responded with Permission denied (publickey). Hmm. Everything else but this Heroku function still works. So I ssh-keygen -t rsa -C "newHeroku" with no passphrase (hit return so it would be empty). So I enter: sudo chmod 600 ~/.ssh/newHeroku* Then: ssh-add ~/.ssh/newHeroku.pub Returning return for the passphrase asked it exits without error. The next step is to: ssh-add /Users/sam/.ssh/newHeroku.pub To verify that it's "live" I enter: ssh-add -l To which the output is still The agent has no identities. Okay, to eliminate variables, I repeat the key generation process but entering in a passphrase for a new key. I ssh-add the new key and get the "Enter passphrase" as expected. Now this is why I'm posting here and not on a Heroku blog because ssh-add fails because the passphrase I used keeps getting rejected. It appears, even though I have no problem with my keys elsewhere, that something is wrong with passphrase because even though I get no errors, I get errors when on the one that expects a passphrase. One question, should I expect the Passphrase request for ssh-add when I have not generated a passphrase? It's been suggested that this is a clue and I offer it. Or maybe I have a poor understanding of what ssh-add is doing. Wouldn't be the first time I asked a stupid Q. Also, I'm on Lion and have updated no system updates in the few weeks of this period except application updates.

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• Problems installing Windows service via Group Policy in a domain

  - by CraneStyle

  I'm reasonably new to Group Policy administration and I'm trying to deploy an MSI installer via Active Directory to install a service. In reality, I'm a software developer trying to test how my service will be installed in a domain environment. My test environment: Server 2003 Domain Controller About 10 machines (between XP SP3, and server 2008) all joined to my domain. No real other setup, or active directory configuration has been done apart from things like getting DNS right. I suspect that I may be missing a step in Group Policy that says I need to grant an explicit permission somewhere, but I have no idea where that might be or what it will say. What I've done: I followed the documentation from Microsoft in How to Deploy Software via Group Policy, so I believe all those steps are correct (I used the UNC path, verified NTFS permissions, I have verified the computers and users are members of groups that are assigned to receive the policy etc). If I deploy the software via the Computer Configuration, when I reboot the target machine I get the following: When the computer starts up it logs Event ID 108, and says "Failed to apply changes to software installation settings. Software changes could not be applied. A previous log entry with details should exist. The error was: An operations error occurred." There are no previous log entries to check, which is weird because if it ever actually tried to invoke the windows installer it should log any sort of failure of my application's installer. If I open a command prompt and manually run: msiexec /qb /i \\[host]\[share]\installer.msi It installs the service just fine. If I deploy the software via the User Configuration, when I log that user in the Event Log says that software changes were applied successfully, but my service isn't installed. However, when deployed via the User configuration even though it's not installed when I go to Control Panel - Add/Remove Programs and click on Add New Programs my service installer is being advertised and I can install/remove it from there. (this does not happen when it's assigned to computers) Hopefully that wall of text was enough information to get me going, thanks all for the help.

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• Autounmounting USB keys with FAT filesystem on Linux (RHEL5)

  - by niXar

  For security reasons, I have two workstations i front of me, and I can only transfer data between them through a USB key. As you can imagine, it can get quickly tiresome, but the most annoying is having to unmount the things before removing them. Not umounting them results in missing files most of the time, even if I remove them a while after having last written to them. Now, since they're only used for transferring smallish files, and each are basically written once and read once, I don't need the fancy pansy caching infrastructure that makes clean unmounting a necessary step. And since the data is always a copy of something I have at hand, I don't care if the filesystem croaks from time to time. But anyway the system doesn't need to force that on me, it could simply make sure everything is committed with a second, and works synchronously. Then when I remove the key, nothing is lost. Is there a way to do this? I would appreciate any other tips on handling this situation. Edit: it appears the situation has changed between RHEL5 and Fedora up to F11 on one hand, and F12 on the other. The latter use DeviceKit-disk, and I haven't quite figured out how to do this. The method provided below in gconf does not work anymore.

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• SSH tunnel for socks5 proxy is slow with concurrent load

  - by RawwrBag

  I ssh to a remote AWS server using Ubuntu. I use ssh's port forwarding capabilities to do this. I have tried forwarding a dynamic port (ssh -D) or a single port (ssh -L with dante running as a remote socks server). Both are equally slow. I also tried different ciphers (ssh -c). Concurrent TCP connections pretty much do not work. For example, I can go to speedtest.net and start a test (which is fairly fast, probably maxes out my line speed) and if I try and do anything (i.e. load google.com) while the test is still running, all the additional connections seem to hang until the speed test is over. I realize OpenSSH is single-threaded. Is this the problem? It doesn't even show up on my top. Same goes for sshd on the remote server -- no processor hit. Is there anyway to bump ssh performance or should I step up to OpenVPN or something better suited for this?

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• How to organize deployment process in Chef-controlled environment?

  - by Alex

  I have a web Linux-based infrastructure which consists of 15 virtual machines and over 50 various services. It is fully controlled by Chef. Most of the services are developed internally. Basically the current deployment process is triggered by a shell script. A build system (a mix of Python and shell scripts) packages the services as .deb files and puts these packages into a repo. It runs apt-get update on all 15 nodes then because the standard Chef apt cookbook only runs apt-get once per day and we definitely do not want to run apt-get update unconditionally on each chef-client wake. The build system restarts chef-client daemons on all 15 nodes finally (we need this step because of pull Chef nature). The current process has a number of drawbacks we want to address. First off, it is asynchronous because the deployment script does not check chef-client logs after restart so we don't even know if the deployment was successful. It does not even wait for Chef clients to complete the cycle. Second, we definitely do not want to force chef-client restarts on all nodes because we usually deploy only a small number of packages. And third, I am not quite sure using chef-client for deployment is legitimate, probably we are just doing it wrong from the start. Please share your thoughts/experience.

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• Why is .htaccess not allowed in a directory but is allowed in another?

  - by John Isaacks

  I have apache2 installed on ubuntu 10.4 inside my var/www/ directory [amung others] I have a cakephp and a dvdcatalog directories. Each of which have CakePHP 1.3 installed. I can access them both via localhost/cakephp and localhost/dvdcatalog But the dvdcatalog shows up with no css styling. They both have these files: /var/www/cakephp/app/webroot/css/cake.generic.css /var/www/dvdcatalog/app/webroot/css/cake.generic.css But when I go to http://localhost/cakephp/css/cake.generic.css it sees the file but it does not see the file when I go to http://localhost/dvdcatalog/css/cake.generic.css I think this means the cakephp folder is able to use .htaccess and the dvdcatalog is not. I setup the cakephp directory last month when I was following in the blog tutorial. I am setting up the dvdcatalog directory now for a different tutorial. So I am not sure if I am missing a step. in my /etc/apache2/apache2.conf file I have this: <Directory "/var/www/*"> Order allow,deny Allow from all AllowOverride All </Directory> Which I thought gave .htaccesss to all. Does anyone have any ideas what the problem is?

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• Delete on windows vista and seven -- discovery process

  - by M'vy

  Hi SUs! I've recently encountered a problem. Using svn at work I needed to clear some space. As you may know svn directories are full of sub-directories and files. So the delete process begins with a step of discovering the items to be deleted (I guess this is for displaying the progress bar). But in my case it ended up to be still running after I watched Braveheart (Off-topic: good film in my opinion. On-topic: and it last 2h50) and counting 440 000+ files. I finally decided to cut off the process and use the good old cmd with a del <directory> to do the job. (Done in some minutes) So I'm wondering if someone know how to override the system to make it actually begins the process while scanning the other items? At the end, I just want the file to be deleted and I don't care the number of files to be deleted. On the contrary I care about the time it takes. Thanks

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• BIOS and Windows cannot detect CDROM device

  - by eman

  Hello! I have a HL-DT-ST RW/DVD GCC-4521B dvdrom device and a big problem. Some days ago everything worked fine. A friend installed some software and then the drives in winxp has been marked as corrupt. I uninstalled the software, but still corrupt drives. The next step I have done was running the current software GCC-4521B101(E).exe. When I ran this software again, the drives was automatically updated, but still marked as corrupt (in the Device Manager), even if I did a reboot. And then the big mistake: once more I tried to run this software, but during the update process, the machine restarted and boom! The DVDROM device doesn't work anymore. The led doesn't blink and if I push the eject button, nothing happens. Also bios and winxp doesn't recognize the optical drive. Then I plugged an other optical drive and it worked, but my old drive seems to be dead. So, what happened and how to solve this problem? Please help. Regards!

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• MySQL command appends '@localhost' to username

  - by Mikee

  I just can't seem to figure this one out. I want to use the command line to connect to a MySQL database residing on another server. I went ahead and created the username and password for the user. I have also granted all privileges on that user for that database. When using the command: mysql -h <hostname> -u <username> -p, I get the following error: ERROR 1045 (28000): Access denied for user '<username>'@'<local_machine_hostname>' (using password: YES) The problem is that it keeps appending the current machine's hostname into the username. Obviously, that user@<local_machine_hostname> is not correct. It doesn't matter what I type. For instance, if I type: mysql -h <hostname> -u '<username>'@'<hostname>' -p It does the same, only in the error output, it says: Access denied for user '<username>@<hostname>'@'<local_machine_hostname>' Is there a setting in a configuration file which is allowing this to happen? It's really quite annoying. I need to set up a tikiwiki server, and it cannot connect because during the step where you set up mysql, it keeps appending the local machine's hostname to the mysql login name.

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• Generalized strategy for file server virtualization in Xenserver

  - by Jamie

  I'm not shopping as much as I'm looking for some guidance on good idea / bad idea strategies. I'm sure I'm not in the "best practices" budget range. Currently, I have 3 dell poweredges running xenserver in a pool. Each node has a ubuntu file server, serving about 6TB. One is the primary, the other two are rsync targets for backup. The 6TB is stored on their respective local storage disks as an LVM of 3x2tb virtual disks. The fileserver VM disks are also stored on the node local disks. Each node also runs a smattering of light-weight VMs for web, development, windows VMs, and stuff like that. Several of those VM's disks reside on a QNAP NAS to play with live migration. These VM's are often clients of the primary file server (like all the mail, web content, user files are stored on the file server, not on the mail, web, and samba VMs). This all works fine, and is a major step up for us. The downside is that the QNAP is a single point of failure. And the only thing the QNAP is doing is serving migratable VM images, not client data. Someday the poweredge local arrays will be full, and we will have to reinvent ourselves again. Is it wise to have heavywieght vms (like the fileserver, with its 6+ TB disks) on a SAN or NAS? Would it be better to keep the VMs lightweight, have the VM images on a SAN or NAS, and use 2 or more NAS act as NFS-serving file appliances? A hybrid SAN/NAS that can serve iscsi for images and NFS for the client vms? It seems like live-magration would be a misnomer if you have to migrate a fileserver with its entire 6+ TB disk. I recognize there are plenty of ways to skin the cat. We've already skinned it a few ways. What makes sense?

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• Is there any way to limit the turbo boost speed / intensity on i7 lap?

  - by Anonymous

  I've just got a used i7 laptop, one of these overheating pavilions from HP with quad cores. And I really want to find a compromise between the temp and performance. If I use linpack, or some other heavy benchmark, the temp easily gets to 95+, and having a TJ of 100 Degrees, for a 2630QM model, it really gets me throttling, that no cooling pad or even an industrial fan could solve. I figured later that it is due to turbo boost, and if I set my power settings to use 99% of the CPU instead of 100%, and it seems to disable the turbo boost, so the temp gets better. But then again it loses quite a bit of performance. The regular clock is 2GHz, and in turbo boost it gets to 2.6Ghz, but I just wonder if I could limit it to around 2.3Ghz, that would be a real nice thing. Also there is another question I've hard time getting answer to. It seems to me that clocks are very quickly boosting up to max even when not needed, eg, it's ok if the CPU has 0% load, the clocks get to their 800MHz, but even if it gets to about 5% it quickly jumps to a max and even popping up turbo, which seems very strange to me. So I wonder if there is any way to adjust the sensitivity of the Speed Step feature. I believe it would be more logical to demand increased clock if it hits let's say 50% load. I do understand that most of these features are probably hardwired somewhere in the CPU itself or the MB, which has no tuning options just like on many laptops. But I would appreciate if you could recommend some thing, or some software. Thanks

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• Synchronize Active Directory to Database

  - by Tommy Jakobsen

  We are in a situation where we would like to offer our customers to be able to manage their users themselves. It is around 300 customers with up to a total of 10.000 users. Besides creating, updating and removing users, they will very often read information about users for statics and other useful informations available. All this functionality, should be available from an Intranet web page (.NET Framework 4) that the users will access through Citrix or similar. Now the problem is that we would really like the users not to query AD directly for each request, but rather make them hit a database that is synchronized with AD. It would be sufficient to run this synchronization a few time each day (maybe every 5. hour). When they create a user, it should not be available right away, but reviewed and then created within two days (the next step would be to remove this manual review, but that's out of scope for this question). What do you think about this synchronization of AD? Does anyone have any experience with it and is it something that is done in other organizations, where you will have lots of requests which is better handled by a database than AD (I presume)? Are there any techniques out there for writing such a script that synchronizes AD with database tables? My primary concern is the groups/members relations which can be rather complicated. Or are there software that synchronizes AD with a database? Any comments will be much appreciated. Thank you.

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• ldapsearch against Active Directory fails

  - by Guacamole

  I am using ldapsearch from OpenLDAP tools to search our corporate Active Directory for my email and phone number. This query is a test to ensure that I can authenticate against the domain so I can set up a linux wiki with NTLM authentication. My theory is that if I can successfully query the AD for information, then I am a step closer to getting my wiki to authenticate against AD (I have instructions to set up moin wiki under ActiveDirectory). The problem is that I can't seem to get the ldapsearch query right. I have seen many tutorials on the net that indicate that -D should be something like -D "Americas\John_Marsharll"; however, I keep getting ldap_bind: Invalid credentials (49) error messages when I use Americas\John_Marshall. The only time I get sensical results is when I query with the parameters below. However, even then, I can't figure out how to get email and phone number. [John_Marsharll@WN7-BG3YSM1 ~]$ ldapsearch -x -h 10.1.1.1 \ -b "cn=Users,dc=Americas" mail telephonenumber -D "cn=John_Marshall,dc=Americas" # extended LDIF # # LDAPv3 # base <cn=Users,dc=Americas> with scope subtree # filter: (objectclass=*) # requesting: mail telephonenumber -D cn=John_Marshall,dc=Americas # # search result search: 2 result: 32 No such object # numResponses: 1 [John_Marshall@WN7-BG3YSM1 ~]$ Can someone give me pointers on what I'm doing wrong with the ldapsearch query above? Our AD ldap server is 10.1.1.1 and the AD domain is "Americas".

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• Moving a site from IIs6 to IIS7.5

  - by Sukotto

  I need to move a site off of IIS6 (Win Server 2003) and onto IIS7.5 (Win Server 2008) as soon as possible. Preferably tomorrow. The site itself is a delightful mix of classic asp (vbscript) and one-off asp.net (C#) applications (each asp.net app is in its own virtual dir and has a self-contained web.config). In case it's relevant, this is a sort of research site made up of 40 or 50 unconnected microsites. Each microsite is typically a simple form allowing a user to submit a form, which then runs a Stored Proc on a sqlserver db and displays a chart and/or table of the results. There is very little security to worry about. The database connection info is in a central file (in the case of the classic asp) or app's individual web.config (lots of duplication there) To add a little spice to the exercise... I have no idea how to admin IIS The company no longer employs the sysadmin or the guys who set this thing up. (They're not going to employ me much longer either but my sense of professional pride does not permit me to just walk away from this task). The servers are on mutually firewalled networks and I have to perform a convoluted, multi-step process to copy anything from one to the other. Would someone please point me to a crash-course tutorial for accomplishing the above? I have: a complete copy of the site's filesystem on the new box installed the 3rd party charting tool on the new system a config.xml file from the "all tasks - save configuration to a file" right click menu. There doesn't seem to be a way to import it on the new system however. The newer IIS manager has a completely different UI and I'm totally lost. Please help.

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• Debian Wheezy 7.5 64bit xfce4 install error ( no desktop environment installed already )

  - by GeoMind

  i wrote a CD with an iso-image from debian.org. the debian-7.5.0-amd64-CD-1.iso from this folder. Debian Wheezy 7.5 stable 64bit There was an error at Select and install software step. It said Retrieving file 770 from 800 and then it failed the installation. I continued the instal and when i opened the computer it doesn't work the Ctrl + Alt + F7 as i waited. It starts at tty1 and after logging in i edited config file cause it had a lot of errors and said E: Unable to correct problems, you have held broken packages or Couldn't found the package. FILE: /etc/apt/sources.list # deb cdrom:[Debian GNU/Linux 7.5.0 _Wheezy_ - Official amd64 CD Binary-1 20140426-13:37]/ wheezy main #deb cdrom:[Debian GNU/Linux 7.5.0 _Wheezy_ - Official amd64 CD Binary-1 20140426-13:37]/ wheezy main deb http://security.debian.org/ wheezy/updates main contrib non-free deb-src http://security.debian.org/ wheezy/updates main contrib non-free deb http://ftp.us.debian.org/debian/ squeeze main contrib non-free deb-src http://ftp.us.debian.org/debian/ squeeze main contrib non-free After that i tried to install xfce4 as desktop environment. Guide found at Linux Panda But it print at terminal: What i sould do? How i can fix this problem?

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• How to make an x.509 certificate from a PEM one?

  - by Ken

  I'm trying to test a script, locally, which involves uploading a file using a Java-based program to a FileZilla FTPES server. For the real thing, there is a real certificate on the FZ server, and the upload step (tested alone) seems to work fine. I've installed FileZilla Server on my dev box (so it'll test uploading from localhost to localhost). I don't have a real certificate for it, of course, so I used the "Generate new certificate..." button in FZ. It works fine from an interactive FTPES program (as long as I OK the unknown cert), but from my Java program it throws a javax.net.ssl.SSLHandshakeException ("unable to find valid certification path to requested target"). So how do I tell Java that this certificate is OK with me? (I know there's a way to change the Java program to accept any certificate, but I don't want to go down that route. I want to test it just as it will happen in production, and I don't want to ignore unknown certificates in production.) I found that Java has a program called "keytool" that seems to be for managing this sort of thing, but it complains that the certificate file that FZ generated is not an "x.509" file. A posting from the FZ side said it was "PEM encoded". I have "openssl" here, which looks like it's perfect for converting between certificate formats, but I think my understanding of certificate formats is wrong because I'm not seeing anything obvious. My knowledge of security certificates is a bit shaky, so if my title is stupidly wrong, please help by fixing that. :-)

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• When modern computers boot, what initial setup of RAM do they execute, and how does it exactly work?

  - by user272840

  I know the title reeks of confusion, and some of you might assume I am just wondering about how the computer boots in general, but I'm not. But I'll sort this out for you people now: 1.Onboard firmware is how mostly all modern computer devices work, whether or not with EFI/UEFI(even without "onboard firmware", older computers still employed bank switching, or similar methods with snap-in firmware, cartridges, etc.) 2.On startup there is no "programs" running in the traditional sense yet, i.e. no kernel, OS, user-applications; all of the instructions, especially the very first instruction, is specified by the Instruction Pointer, I am guessing. How is the IP/PC/etc. set to first point to an address for a BIOS/firmware/etc. instruction, and how do the BIOS instructions map themself out in memory prior to startup? 3.Aside from MMIO, BIOS uses certain RAM addresses to have instructions. The big ? comes in when I ask this ... how does BIOS do this? Conclusion: I am assuming that with the very first instruction there is an initial hardware setup for BIOS prior to complete OS bootup. What I want to know is if it's hardware engineered to always work this way, if there's another step in this bootup method I am missing, a gap of information I am unaware of, or how this all works from the very first instruction, and the RAM data itself.

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• When a server IP changes, do exising TCP (e.g. http/mysql) connections remain running

  - by Luke Cousins

  We have some PHP-FPM servers and when they need a database connection, they connect to an HAProxy server which selects them a database server to use and the connection opens. When we then want to perform some maintenance on the HAProxy servers (such as config changes requiring an HAProxy restart), the process is as follows: Shutdown Keepalived on the HAProxy server Wait for the floating IP to transfer to the backup HAProxy server (also running Keepalived) Wait until HAProxy stats is reporting just one connection (us checking how many connections there are) Restart HAProxy Restart Keepalived As step 2 occurs, what will happen to the open mysql connections at that point? According to this TCP Sessions and IP Changes question the connections will be dropped. Is this really the case? If so, what, if anything, can be done to prevent this happening? Can the connection be in some way forced to use the main (non-floating) IP of the server? We also have a similar setup with two Nginx servers with Keepalived running on them and we were planning on doing the equivalent process. If we do, the same question applies - what happens to the existing http connections when the IP moves to the other server? I appreciate your help.

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• how to rewrite '%25' in url

  - by nn4l

  My website software replaces space characters with '+' characters in the URL, A proper link would look like 'http://www.schirmacher.de/display/INFO/How+to+reattach+a+disk+to+XenServer' for example. Some websites link to that article but somehow their embedded editor can't handle the encoding, so what I see in the httpd log files is actually GET /display/INFO/How%2525252bto%2525252breattach%2525252ba%2525252bdisk%2525252bto%2525252bXenServer which of course leads to a 404 error. It seems that the '+' character is encoded as '%2b' and then the '%' character is encoded as '%25' - several times. Since there are many such references to different pages from different websites, I would like to rewrite the url so that the visitors get the correct page. Here's my attempt which does not work: RewriteRule ^(.*)%25(.*)$ $1%$2 [R=301] What it is supposed to do is: take everything before the %25 string and everything after it, concat those strings with a '%' in between, then redirect. With the example input URL the rule should rewrite to /display/INFO/How%25252bto%2525252breattach%2525252ba%2525252bdisk%2525252bto%2525252bXenServer followed by a redirect, then it should rewrite to /display/INFO/How%252bto%2525252breattach%2525252ba%2525252bdisk%2525252bto%2525252bXenServer and again to /display/INFO/How%2bto%2525252breattach%2525252ba%2525252bdisk%2525252bto%2525252bXenServer and so on. Finally, after a lot of redirects I should have left /display/INFO/How%2bto%2breattach%2ba%2bdisk%2bto%2bXenServer which is a valid url equivalent to /display/INFO/How+to+reattach+a+disk+to+XenServer. My problem is that the expression does not match at all, so it does not even replace a single occurrence of %25. I understand that there is a limit in the number of redirects and I should really use the [N] flag however I don't even get the first step right.

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• Merely installing PHP5 causes my AWS Ubuntu server to die minutes later from a massive CPU spike

  - by Mark Amery

  I have an AWS server with Ubuntu 11.04 as the OS that is running an Apache2 webserver (incidentally Python-based and using Django). We recently needed to add support for php5 to let us use a third party PHP library (incidentally for serving minified versions of js and css files). However, for no reason any of us can discern, if we simply run sudo apt-get install php5 on the server, then the install appears to finish successfully but, without us taking any further action (including not yet running sudo apt-get install libapache2-mod-php5, which I think would be the next step for us if everything worked), or actually running any PHP scripts on the server, a few minutes later the server becomes impossible to connect to, and looking at the 'Monitoring' tab for the server in the EC2 Management Console reveals that a while after the installation, CPU usage spikes to 100% and stays there permanently (until we reboot the server from the AWS Console). After rebooting, the server also reliably dies within a few (between 0 and 10) minutes. We restored the server to a pre-PHP state from an AMI Image, observed that it was stable, and then tried installing PHP5 again and observed the server die in exactly the same way, so we're pretty much certain that installing PHP5 is what causes the symptoms. What on earth could be causing this behaviour, and how can we get PHP installed on the server without it dying?

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