marc hughes - Page 8 - Developer IT

Connect an iPhone to OpenVPN

- by Marc

Is there any way to connect an iPhone to our company OpenVPN server?

Best way to monitorize a Grid of computers?

Hello, I've installed sun grid in 10 nodes, and one virtual master host. Now I have to monitorize all the resourses prior to launch it to production, but I don't know which is the best way. I've tried using xml-qstat, but it seems unstable. Any tips or suggestions? Anyone got experience on this? thanks.

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Location of Opera cookies set to expire after restart (time 0)

- by marc

Where does Opera store cookies that are destroyed or expire after the browser is restarted? I'm looking for information on where these temporary cookies, with time expire (0), and that are deleted after a browser restart. I tested a file "cookies4.dat" using a hex editor and it doesn't have the temporary cookies stored inside. Does Opera create a temporary file for these cookies and delete them after restart? If that was so, where are they? Or does it store them in RAM?

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Why do I get a My Disney window when installing VMWare Workstation?

- by Marc Esher

I'm assuming this is a virus, though my virus checker can't find it. I downloaded the latest vmware workstation 7 installer. I'm running Windows 7 64bit. I go to install it, and the installer window is a Disney website. Upon further investigation, what's happening is that the vmware installer extracts/writes a bunch of files to a temp directory. One of those files is an index.htm file. When I open it, sure enough it's the Disney file. I used sysinternals Process Monitor to look for anything fishy, but the only thing I see touching that index.htm file is the vmware installer and explorer.exe

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Where opera store cookies set by expire after restart (time 0)

- by marc

Welcome, I'm looking for information where opera store temporary cookies with time expire (0), what's mean - cookie should be deleted after restart browser. Do opera create temporary file for these cookies and delete after restart (if yes what file), or store them in memory (RAM). I'm tested file "cookies4.dat" by hex-editor and it don't have that "temp" 0 cookies stored inside. regards

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How to bypass vpn talking to VMWare Guest?

- by marc esher

Greetings. Network/VPN n00b question here. I'm running VMWare Workstation with a Guest Windows 2003 Server. It has SQL Server 2000 installed. The sole purpose for this Guest is to house SQL Server... it needn't have internet access or access to any other resources on the network other than the host. When launch Check Point VPN software, the host routes through the company network before it connects to the guest ... i.e. it's no longer a direct connection. I assume this is just how things are supposed to work. However, what's happening is that the connection between my host and the SQL Server instance on the guest intermittently drops. It's not consistent, and some databases on the server will be responsive while others aren't. It appears that the databases with the most traffic on the guest (the ones I'm hitting with load tests) are the ones that become intermittently unresponsive. This problem only manifests when VPN is on; when it's off, I can pound away on this database with no troubles. Thanks for any advice!

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AVCHD MTS h264 1080p file with choppy playback in Linux

- by marc

When I'm trying play video files from my camera: Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1) -> 50.00 (50/1) Input #0, mpegts, from '00027.MTS': Duration: 00:00:38.88, start: 2.884289, bitrate: 16945 kb/s Program 1 Stream #0.0[0x1011]: Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 50 tbc Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s … on my Linux computer (Ubuntu 12.04), I get choppy playback. It's completly unusable... I tried: Totem VLC mplayer The result is always same issue. I sent the same video file to a friend who has ubuntu 10.04 to test, and he also has the same issue. He has Windows 7, and confirms that on Windows, the video work well. I have an Intel® Core™2 CPU 6300 @ 1.86GHz × 2 with GF 9600 GT, with closed NVIDIA drivers. This is not any kind of issue with big files playing slow from an HDD issue. I have an SSD drive! I spent the last days and nights, trying hundreds of commands for ffmpeg, handbrake, mencoder... Any of them won't let me create a file with enough quality. I downloaded few movies from YouTube in 1080p, and playback worked well without any big pixels and choppiness. I would like have highest possible quality, I will put following files onto a Blu-ray disk so I don't need to compress them to get a smaller size. I just want smoth playback on my Linux box. On Windows, the same file is working well.

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Fujitsu siemens V6535 - crash when going standby ?

- by marc

Welcome, I trouble with my laptop fujitsu siemens model V6535. My siemens work under Windows 7, and from upgrade time (vista to 7) notice something what make me really angry. When my siemens go to standby mode (when i don't use it for some time), power diode change to red and start blinking (standbay mode). When i push power button (wake up it), blinking diode change to green but nothing else happend (nothing on display, no sound of HDD). When i press power button few second and try turn it on again... it wont display anything... i have unplug charger and then shutdown and power on again without power cable. Then he start working... Few days ago i done upgrade bios to nevest version... but it don't help... Anyone have idea what can be wrong ?

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Disallow root to su on a user which is not listed in /etc/passwd

- by marc.riera

Hello, on linux we autenticate users against AD. The AD users are not listed on /etc/passwd. We are about to deploy a NFS solution to mount some extra space for each group of users. If a user(A) with sudo su privileges goes to root, then he can impersonate user(B) just by su user(B) and going to the NFS. Is there any way to disallow root to su user if the user is not listed on /etc/passwd ? Thanks.

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Which is the fastest way to move 1Petabyte from one storage to a new one?

- by marc.riera

First of all, thanks for reading, and sorry for asking something related to my job. I understand that this is something that I should solve by myself but as you will see its something a bit difficult. A small description: Now Storage = 1PB using DDN S2A9900 storage for the OSTs, 4 OSS , 10 GigE network. (lustre 1.6) 100 compute nodes with 2x Infiniband 1 infiniband switch with 36 ports After Storage = Previous storage + another 1PB using DDN S2A 990 or LSI E5400 (still to decide) (lustre 2.0) 8 OSS , 10GigE network 100 compute nodes with 2x Infiniband Previous experience: transfered 120 TB in less than 3 days using following command: tar -C /old --record-size 2048 -b 2048 -cf - dir | tar -C /new --record-size 2048 -b 2048 -xvf - 2>&1 | tee /tmp/dir.log So , big problem here, using big mathematical equations I conclude that we are going to need 1 month to transfer the data from one side to the new one. During this time the researchers will need to step back, and I'm personally not happy with this. I'm telling you that we have infiniband connections because I think that may be there is a chance to use it to transfer the data using 18 compute nodes (18 * 2 IB = 36 ports) to transfer the data from one storage to the other. I'm trying to figure out if the IB switch will handle all the traffic but in case it just burn up will go faster than using 10GigE. Also, having lustre 1.6 and 2.0 agents on same server works quite well, with this there is no need to go by 1.8 to upgrade the metadata servers with two steps. Any ideas? Many thanks Note 1: Zoredache, we can divide it in two blocks (A)600Tb and (B)400Tb. The idea is to move (A) to new storage which is lustre2.0 formated, then format where (A) was with lustre2.0 and move (B) to this lustre2.0 block and extend with the space where (B) was. This way we will end with (A) and (B) on separate filesystems, with 1PB each.

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I used my ntfs formatted hard drive, copied files from a mac using a bridge program, but now i can't

- by Marc

I used my ntfs formatted hard drive, copied files from a mac using a bridge program, but now i can't see any of the files on my pc help? I brought it from home, (NTFS HD) found that it was only read only.. so i got a bridge program (don't remember) and was able to copy files from the mac to the hard drive. I took it home and went to get into those files, and they do not even show up.. it copied, and did everything it was supposed to do to let me know it was working, but now i can't find any of those files. am I FUBAR? :(

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Correctly configure nameservers with cPanel

- by Marc-Antoine

I just bought a VPS with cPanel/WHM. My hosting provider gave me 3 dedicated IP addresses with my plan. I read on the internet that I should use 2 IPs for my nameservers and the other one as the main IP for all my shared accounts. Could you tell me why I should do that ? What are the advantages of using IP addresses only for nameservers and another one only for my shared accounts instead of using the same IP for all my nameservers and shared account ? I'm asking because I don't want to use an IP for nothing. Thank you.

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Fujitsu Siemens V6535 laptop doesn't wake up - crash when going into standby?

- by marc

I'm having trouble with my laptop (Fujitsu Siemens model V6535). It runs Windows 7, and after I upgraded from Vista I've noticed something that makes me really angry. When my laptop goes into Standby, the power LED changes to red and starts blinking (standby mode). When I push the power button to wake it up it, the blinking LED changes to green but nothing else happens. Nothing on the display, no HDD sound. When I press the power button for a few seconds and then try turn it on again, it doesn't display anything. I have to unplug the charger, shut it off, and power it on again without the power cable. Then it starts working. A few days ago I upgraded the BIOS to the newest version, but it doesn't help. Does anyone have any idea what can be wrong?

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Multiple servers acting like a single one with all the hardware?

- by marc.riera

Hello, by now I have 10 servers for hpc, power computing oriented. My users need to launch several processes using qmake. The users are used to work with ubuntu 9.10, and the software from the repositories is switable for them. I've deployed ubuntu 9.10 to all 10 servers (pxe rocks). By now we work with parallel-ssh and cluster-ssh, which allows as to launch the same process to all servers. With this tools this tools the servers remain as independent but with the same software and the same launched command. Now we would like to go to next step and see all the servers as a single one with all the resources from the other 9 as if was its resources. The difference would be substantial in time to process and also time to design the command to launch. Any advice on wich software to use will be very useful? Thanks

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How to retrieve the size of a database in restoring mode

- by Marc Wittke

With pure SQL - how to do it? I doubt it is possible, since even the SQL Management Studio fails to show the size of such a database in the UI. Already tried: exec sp_helpdb 'DbInRecMode' ...won't show anything; exec sys.sp_helpfile 'DbInRecMode' ... something like file not found (Msg 15325) Main pitfall seems to be the issue, that select * from DbInRecMode.dbo.sysfiles won't work when the database is in restoring mode. Any ideas?

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ubuntu 12.10/linux mint 14 ssh-copy-id doesn't work and returns Ambiguous output redirect

- by Marc

I recently got a new computer and I'm trying to use ssh-copy-id to put my keys on another server so I can login without password. but when I try ssh-copy-id -i ~/.ssh/id_rsa.pub user@server and after inputting the correct password it returns Ambiguous output redirect. There are no other messages after that. I thought it was maybe just Ubuntu 12.10 so I installed Linux Mint 14 and sure enough exact same thing happens. I've tried removing authorized_keys from the remote server but that didn't change anything.

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Are there any tests I can run on a network to simulate 100 heavy network users?

- by marc.gayle

I will be hosting a Ruby on Rails workshop at a small hotel in the near future, and while they have 'Wifi' everywhere on the property, and the property normally hosts 150 - 300 people, I am not 100% confident that they have hosted 150 tech people that tend to have heavy web surfing habits/needs. Their tech department is also 1 or 2 guys. Are there any automated tests I can download and run from my laptop, on the network, that would simulate 100 'heavy users' on the network at the same time? Their broadband pipe is a 15mbps cable connection. Would that suffice for the general surfing needs of 100 - 150 techies? I know all it takes is 1 or 2 bit torrenters to kill the entire network, but assuming we can at the very least block those ports or encourage the attendees not to file share on the network, would that speed suffice for general surfing needs? What are good resources online that would allow me to quickly get up to speed on the IT related issues, so that I can ask their sysadmins the right questions? Edit: Note that I am fairly technical, so assume I can get up to speed quickly even with technical manuals, etc.

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Apache availability with the two front-ends on diferent locations. Is it possible?

- by marc.riera

Hello, I have to locations (office and service providers). One DNS(bind) serving our domain as authoritative, and a service provider webserver with our corporate web on a private server. So.. Now we are planing to upgrade our server on the ISP to a new one, and I would like to use this situation to improve our service. Is it possible to mount a high availability apache/mysql/php within to different locations? I will install a bind slave on the same new server, so I hope it will make things easier, but I need some hints and tips on how to ride it. THanks.

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How do I email all users and their relevant domains in a UNIX system?

- by Marc Behiels

I need to mail all users on my shared hosting platform. I need to be able to do this on a regular basis. Any thoughts?

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/usr/bin/sshd isn't linked against PAM on one of my systems. What is wrong and how can I fix it?

- by marc.riera

Hi, I'm using AD as my user account server with ldap. Most of the servers run with UsePam yes except this one, it has lack of pam support on sshd. root@linserv9:~# ldd /usr/sbin/sshd linux-vdso.so.1 => (0x00007fff621fe000) libutil.so.1 => /lib/libutil.so.1 (0x00007fd759d0b000) libz.so.1 => /usr/lib/libz.so.1 (0x00007fd759af4000) libnsl.so.1 => /lib/libnsl.so.1 (0x00007fd7598db000) libcrypto.so.0.9.8 => /usr/lib/libcrypto.so.0.9.8 (0x00007fd75955b000) libcrypt.so.1 => /lib/libcrypt.so.1 (0x00007fd759323000) libc.so.6 => /lib/libc.so.6 (0x00007fd758fc1000) libdl.so.2 => /lib/libdl.so.2 (0x00007fd758dbd000) /lib64/ld-linux-x86-64.so.2 (0x00007fd759f0e000) I have this packages installed root@linserv9:~# dpkg -l|grep -E 'pam|ssh' ii denyhosts 2.6-2.1 an utility to help sys admins thwart ssh hac ii libpam-modules 0.99.7.1-5ubuntu6.1 Pluggable Authentication Modules for PAM ii libpam-runtime 0.99.7.1-5ubuntu6.1 Runtime support for the PAM library ii libpam-ssh 1.91.0-9.2 enable SSO behavior for ssh and pam ii libpam0g 0.99.7.1-5ubuntu6.1 Pluggable Authentication Modules library ii libpam0g-dev 0.99.7.1-5ubuntu6.1 Development files for PAM ii openssh-blacklist 0.1-1ubuntu0.8.04.1 list of blacklisted OpenSSH RSA and DSA keys ii openssh-client 1:4.7p1-8ubuntu1.2 secure shell client, an rlogin/rsh/rcp repla ii openssh-server 1:4.7p1-8ubuntu1.2 secure shell server, an rshd replacement ii quest-openssh 5.2p1_q13-1 Secure shell root@linserv9:~# What I'm doing wrong? thanks. Edit: root@linserv9:~# cat /etc/pam.d/sshd # PAM configuration for the Secure Shell service # Read environment variables from /etc/environment and # /etc/security/pam_env.conf. auth required pam_env.so # [1] # In Debian 4.0 (etch), locale-related environment variables were moved to # /etc/default/locale, so read that as well. auth required pam_env.so envfile=/etc/default/locale # Standard Un*x authentication. @include common-auth # Disallow non-root logins when /etc/nologin exists. account required pam_nologin.so # Uncomment and edit /etc/security/access.conf if you need to set complex # access limits that are hard to express in sshd_config. # account required pam_access.so # Standard Un*x authorization. @include common-account # Standard Un*x session setup and teardown. @include common-session # Print the message of the day upon successful login. session optional pam_motd.so # [1] # Print the status of the user's mailbox upon successful login. session optional pam_mail.so standard noenv # [1] # Set up user limits from /etc/security/limits.conf. session required pam_limits.so # Set up SELinux capabilities (need modified pam) # session required pam_selinux.so multiple # Standard Un*x password updating. @include common-password Edit2: UsePAM yes fails With this configuration ssh fails to start : root@linserv9:/home/admmarc# cat /etc/ssh/sshd_config |grep -vE "^[ \t]*$|^#" Port 22 Protocol 2 ListenAddress 0.0.0.0 RSAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys ChallengeResponseAuthentication yes UsePAM yes Subsystem sftp /usr/lib/sftp-server root@linserv9:/home/admmarc# The error it gives is as follows root@linserv9:/home/admmarc# /etc/init.d/ssh start * Starting OpenBSD Secure Shell server sshd /etc/ssh/sshd_config: line 75: Bad configuration option: UsePAM /etc/ssh/sshd_config: terminating, 1 bad configuration options ...fail! root@linserv9:/home/admmarc#

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How to bypass vpn talking to VMWare Guest?

- by marc esher

Greetings. Network/VPN n00b question here. I'm running VMWare Workstation with a Guest Windows 2003 Server. It has SQL Server 2000 installed. The sole purpose for this Guest is to house SQL Server... it needn't have internet access or access to any other resources on the network other than the host. When launch Check Point VPN software, the host routes through the company network before it connects to the guest ... i.e. it's no longer a direct connection. I assume this is just how things are supposed to work. However, what's happening is that the connection between my host and the SQL Server instance on the guest intermittently drops. It's not consistent, and some databases on the server will be responsive while others aren't. It appears that the databases with the most traffic on the guest (the ones I'm hitting with load tests) are the ones that become intermittently unresponsive. This problem only manifests when VPN is on; when it's off, I can pound away on this database with no troubles. Thanks for any advice!

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networked storage for a research group, 10-100 TB

- by Marc

this is related to this post: http://serverfault.com/questions/80854/scalable-24-tb-nas-for-research-department but perhaps a little more general. Background: We're a research lab of around 10 people who do a lot of experiments that involve taking pictures at one of several lab setups and then analyzing it an one of several lab computers. Each experiment may produce 2 or 3 GB of data, and we are generating data at the rate of about 10 TB/year. Right now, we are storing the data on a 6-bay netgear readynas pro, but even with 2 TB drive, this only gives us 10 TB of storage. Also, right now we are not backing up at all. Our short term backup plan is to get a second readynas, put it in a different building and mirror the one drive onto the other. Obviously, this is somewhat non-ideal. Our options: 1) We can pay our university $400/ TB /year for "backed up" online storage. We trust them more than we trust us, but not a whole lot. 2) We can continue to buy small NASs and mirror them between offices. One limit, although stupid, is that we don't have an unlimited number of ethernet jacks. 3) We can try to implement our own data storage solution, which is why I'm asking you guys. One thing to consider is that we're a very transient population and none of us are network administration experts. I will probably be here only another year or so, and graduate students, who are here the longest, have a 5-6 year time scale. So nothing can require expert oversight. Our data transfer rates are low - most of the data will just sit on the server waiting for someone to look at it once or twice - so we don't need a really high speed system. Given these contraints, can someone recommend a fairly low-cost, scalable, more or less turn key shared data storage system with backup in a separate physical location. Does such a thing exist or should we just pay the university to take care of it for us? As a second question, our professor just got tenure and is putting together a budget. Here the goal is to ask for as much as you can and hope you get a fraction of it. So the same question, minus the low-cost. Without budget constraints, can you recommend a scalable turn-key backed up storage system. Thanks

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Disable CD eject button on Windows laptop

- by Marc Gravell

Most laptops have a CD eject that is very sensitive, and placed such that it regularly gets triggered when handling the laptop. This is in particular a problem (for clumsy-handed me) when picking up the laptop to stow in in a laptop bag; I've lost count of the number of times it has ejected just as I am lowering it into the case! I rarely use a CD, but I am wondering whether some crafty software hack (or other trick) might be possible to make it less vulnerable. Perhaps trying to fool it into thinking it is busy (but ideally without destroying my battery). Otherwise, I might as well bow to the inevitable and snap the darned thing off. I'm not making this brand-specific, as I've seen this problem on a range of both branded and re-badged laptops. I am, however, mainly interested in windows-friendly solutions.

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Set character_set_results UTF8 in MySQL my.cnf

- by Marc

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Add separate domain name to Wordpress admin area with htaccess

- by Marc

I have a Wordpress installation in a seperate folder on my server (meaning it is not in the root folder). I have a htaccess rewrite rule that maps Domain A to folder A. Inside folder A is the Wordpress admin folder, let's call it folder A.B. I tried mapping Domain B to folder A.B., but I can't get it to work properly. When you log in to Wordpress via /admin, you get redirected to /wp-login.php (so from folder A.B. to folder A), maybe that is where I get into trouble. So what I would like to do is this: Domain A folder A Domain B folder A.B Note that this is not for security purposes, I just like the idea of www.domainb.com instead of www.domaina.com/wp-admin. Can this be done with Wordpress?

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