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  • What kind of “sysadmin stuff” should I show to students during a talk?

    - by Gregory Eric Sanderaon
    A teacher asked me If I could talk about my job as a linux sysadmin in his class. The course is called "Introduction to Operating systems" and i've been given 45 minutes to talk. The students are beginning their second year, so they've had a bit of experience with programming in different languages. What i'm like to do is show a series of hands-on examples of the kinds of things I do on a regular basis. I've already got a few ideas jotted down, but I'm afraid that they might be either too advanced or too simple for the students to appreciate. Another concern is that a topic might be too long to explain and use too much time overall. Here are a few ideas : Program deployment using version control (git in my case) filtering apache logs using grep, awk, uniq, tail A couple of bash scripts that i've made for various stuff on servers live montitoring (htop, iotop, iptraf) creating databases and assigning roles in mysql/postgresql So, are these ideas any good ? Do you have better ideas ? are the ideas too simple and should I go for more "advanced" stuff ?

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  • OpenVpn Iptables Error

    - by Mook
    I mean real newbie - linux here.. Please help me configuring my openvpn through iptables. My main goal here is to open port for regular browsing (80, 443), email (110, 25), etc just like isp does but i want to block p2p traffic. So I will need to open only few port. Here are my iptables config # Flush all current rules from iptables # iptables -F iptables -t nat -F iptables -t mangle -F # # Allow SSH connections on tcp port 22 (or whatever port you want to use) # iptables -A INPUT -p tcp --dport 22 -j ACCEPT # # Set default policies for INPUT, FORWARD and OUTPUT chains # iptables -P INPUT DROP #using DROP for INPUT is not always recommended. Change to ACCEPT if you prefer. iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT # # Set access for localhost # iptables -A INPUT -i lo -j ACCEPT # # Accept packets belonging to established and related connections # iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # #Accept connections on 1194 for vpn access from clients #Take note that the rule says "UDP", and ensure that your OpenVPN server.conf says UDP too # iptables -A INPUT -p udp --dport 1194 -j ACCEPT # #Apply forwarding for OpenVPN Tunneling # iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -s 10.8.0.0/24 -j ACCEPT #10.8.0.0 ? Check your OpenVPN server.conf to be sure iptables -A FORWARD -j REJECT iptables -t nat -A POSTROUTING -o venet0 -j SNAT --to-source 100.200.255.256 #Use your OpenVPN server's real external IP here # #Enable forwarding # echo 1 > /proc/sys/net/ipv4/ip_forward iptables -A INPUT -p tcp --dport 25 -j ACCEPT iptables -A INPUT -p tcp --dport 26 -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 110 -j ACCEPT iptables -A INPUT -p tcp --dport 443 -j ACCEPT iptables -L -v But when I connect to my vpn, i can't browsing and also got RTO on pinging yahoo, etc

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  • Vista logs into black screen, "Application Error 0xc0000022" for explorer.exe

    - by IMAPC
    Whenever I attempt to log into a Windows Vista computer (the only account on it), I'm presented with a black screen & a cursor. I can open Task Manager, and from there I can launch applications. It seems to be using Aero Basic (instead of the full Aero which I had set as default before the problem started). When attempting to launch "explorer.exe" I get "explorer.exe - Application Error 'The application failed to initialize properly (0xc0000022). Click OK to terminate the application.'" Every now and then I get an error along the lines of "the application has failed to start because its side by side configuration is incorrect please see the application event log for more detail." I can boot into safe mode successfully, but I still get the black screen when I log into it in regular mode. I've tried most of the suggestions here, but did not work. I'm attempting to back up everything right now in case the only fix is to reinstall Windows. Has anyone seen this before?

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  • Configuration management in support of scientific computing

    - by Sharpie
    For the past few years I have been involved with developing and maintaining a system for forecasting near-shore waves. Our team has just received a significant grant for further development and as a result we are taking the opportunity to refactor many components of the old system. We will also be receiving a new server to run the model and so I am taking this opportunity to consider how we set up the system. Basically, the steps that need to happen are: Some standard packages and libraries such as compilers and databases need to be downloaded and installed. Some custom scientific models need to be downloaded and compiled from source as they are not commonly provided as packages. New users need to be created to manage the databases and run the models. A suite of scripts that manage model-database interaction needs to be checked out from source code control and installed. Crontabs need to be set up to run the scripts at regular intervals in order to generate forecasts. I have been pondering applying tools such as Puppet, Capistrano or Fabric to automate the above steps. It seems perfectly possible to implement most of the above functionality except there are a couple usage cases that I am wondering about: During my preliminary research, I have found few examples and little discussion on how to use these systems to abstract and automate the process of building custom components from source. We may have to deploy on machines that are isolated from the Internet- i.e. all configuration and set up files will have to come in on a USB key that can be inserted into a terminal that can connect to the server that will run the models. I see this as an opportunity to learn a new tool that will help me automate my workflow, but I am unsure which tool I should start with. If any member of the community could suggest a tool that would support the above workflow and the issues specific to scientific computing, I would be very grateful. Our production server will be running Linux, but support for OS X would be a bonus as it would allow the development team to setup test installations outside of VirtualBox.

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  • Configuration management in support of scientific computing

    - by Sharpie
    For the past few years I have been involved with developing and maintaining a system for forecasting near-shore waves. Our team has just received a significant grant for further development and as a result we are taking the opportunity to refactor many components of the old system. We will also be receiving a new server to run the model and so I am taking this opportunity to consider how we set up the system. Basically, the steps that need to happen are: Some standard packages and libraries such as compilers and databases need to be downloaded and installed. Some custom scientific models need to be downloaded and compiled from source as they are not commonly provided as packages. New users need to be created to manage the databases and run the models. A suite of scripts that manage model-database interaction needs to be checked out from source code control and installed. Crontabs need to be set up to run the scripts at regular intervals in order to generate forecasts. I have been pondering applying tools such as Puppet, Capistrano or Fabric to automate the above steps. It seems perfectly possible to implement most of the above functionality except there are a couple usage cases that I am wondering about: During my preliminary research, I have found few examples and little discussion on how to use these systems to abstract and automate the process of building custom components from source. We may have to deploy on machines that are isolated from the Internet- i.e. all configuration and set up files will have to come in on a USB key that can be inserted into a terminal that can connect to the server that will run the models. I see this as an opportunity to learn a new tool that will help me automate my workflow, but I am unsure which tool I should start with. If any member of the community could suggest a tool that would support the above workflow and the issues specific to scientific computing, I would be very grateful. Our production server will be running Linux, but support for OS X would be a bonus as it would allow the development team to setup test installations outside of VirtualBox.

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  • Unconvert Text File from Binary Format

    - by Hammer Bro.
    I've got a rather large CSV file (~700MB) which I know to consist of lines of 27-character alpha-numeric hashes; no commas or anything fancy. Somehow, during its migration from Windows to Linux (via winSCP and then a few regular SCPs), it has converted into some kind of binary format I am unfamiliar with. If I open the file in vi, everything appears fine, and it says [converted] at the bottom, although I know it's not a line endings issue (and dos2unix doesn't help). If I 'head' the file, it looks proper except for a "ÿþ" at the beginning of the first line. If I open up the file in nano, however, I see the "ÿþ" at the start and then "^@" before every character (even newlines and EoF). If I try to re-save or copy the file (say via: head file.csv short.txt), this special encoding is preserved. I copied the first ten lines out of vi (which displays it properly) into my Windows clipboard via my SSH client, then pasted it into a new text file, test.txt. This file is visually identical when opened in vi (and similar through 'head', minus the "ÿþ"), although it's roughly half of the filesize. Additionally, file test.txt test.txt: ASCII text file short.txt short.txt: I have no idea what format this once-text file got converted to (it's notoriously hard to search the internet for symbols), but surely there must be some way to convert it back. Any ideas?

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  • SSH Tunnel for Remote Desktop via Intermediary Server Part II

    - by Mihai Todor
    I asked previously how to configure 2 SSH tunnels using an intermediary server in order to run Remote Desktop through them and I managed to make it work. Now, I'm trying to do the same, using the same machines, but in reverse order. Here's the setup: Windows 7 PC in a private network, sitting behind a firewall. Public access Linux server, which has access to the PC. Windows 7 laptop, at home, on which I wish to do Remote Desktop from the PC. I use Putty on the laptop to create a reverse tunnel from it to the Linux server: R60666 localhost:3389. I use Putty on the PC to create a regular tunnel from it to the Linux server: L60666 localhost:60666. I SSH to the Linux sever and I run telnet localhost 60666 and it seems to produce the expected output, as described in the debugging tips that I received here. I try to connect Remote Desktop from the PC to the laptop: localhost:60666. It asks for my username and password, I click OK and it locks my current session on the laptop (so I see the welcome screen on the laptop instead of my desktop), it shows the "Welcome" message in the Remote Desktop screen and then it just goes black. It doesn't disconnect, it doesn't provide any error and I'm not able to perform any actions in the Remote Desktop screen. I tried the same setup with a Windows XP laptop and I'm experiencing the same symptoms. I also tried to use different ports than 60666, but nothing changed. Does anybody have any idea what I'm doing wrong? Update: As pointed out by @jwinders, I'm not able to run telnet PC 3389 from the Linux server directly. Since Windows Firewall has a rule to allow all connections on port 3389, I have no idea what is blocking it. Fortunately, I'm able to create a SSH tunnel from the Linux machine to the PC ssh 3389:localhost:3389 'domain\user'@PC.

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  • Setting up Git / Apache on Windows

    - by yodaj007
    I'm following this tutorial to set up a personal Git server on Apache on my Windows 7 box. However, when I add the following to my httpd.conf, Apache throws an error when I try to start it. Can anyone assist in fixing whatever is wrong? SetEnv GIT_PROJECT_ROOT C:/Repositories SetEnv GIT_HTTP_EXPORT_ALL ScriptAliasMatch "(?x)^/(.*/(HEAD | info/refs | objects/(info/[^/]+ | [0-9a-f]{2}/[0-9a-f]{38} | pack/pack-[0-9a-f]{40}.(pack|idx)) | git-(upload|receive)-pack))$" "C:/Program Files (x86)/git/libexec/git-core/git-http-backend.exe/$1" This is a fresh install of Apache. The only other change I've made to the config file is telling Apache to listen on port 9000 (IIS is listening on 80). This is the error from my event logs: The Apache service named reported the following error: ScriptAliasMatch takes two arguments, a regular expression and a filename . I tried putting all of the text on one line, like so: ScriptAliasMatch "(?x)^/(.*/(HEAD | info/refs | objects/(info/[^/]+ | [0-9a-f]{2}/[0-9a-f]{38} | pack/pack-[0-9a-f]{40}.(pack|idx)) | git-(upload|receive)-pack))$" "C:/Program Files (x86)/git/libexec/git-core/git-http-backend.exe/$1" But nada.

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  • Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you

    - by nickf
    I've been trying to upgrade my installation of Ubuntu 9.04 to 9.10, but all of the instructions I've found haven't been helping. They mostly say to run the update manager and it'll tell you that there's a new distribution ready. Well, mine doesn't say that. Things I've run or checked: update-manager -d says: Your system is up-to-date The package information was last updated less than one hour ago. I've set it to get all new distributions, not just LTS $ cat /etc/update-manager/release-upgrades [DEFAULT] # default prompting behavior, valid options: # never - never prompt for a new distribution version # normal - prompt if a new version of the distribution is available # lts - prompt only if a LTS version of the distribution is available Prompt=normal I'm definitely running 9.04 $ lsb_release -r Distributor ID: Ubuntu Description: Ubuntu 9.04 Release: 9.04 Codename: jaunty Even running the release upgrade from console doesn't help: $ sudo do-release-upgrade Checking for a new ubuntu release No new release found This is running from behind a proxy, but I've set it up such that the regular upgrades and apt-get etc doesn't complain. (export http_proxy=http://myuser:mypass@myserver:8080/) Could you think of anything else which might be stopping me from upgrading?

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  • Install Ubuntu on a new netbook?

    - by torbengb
    I'm planning to buy a netbook, and I am considering to install Ubuntu on it. It would mainly be used by my wife at home for web browsing and email at home (lightweight is important, hence a netbook!), and we'd occasionally bring it along on travels (mostly as digital photo dropzone). I want to use Ubuntu instead of Windows because I'm sick of all the Windows hassle and updates. I'm not concerned about Windows applications; I'd switch to native alternatives as far as possible because really only Firefox and something like Picasa are needed. I'm considering an ASUS Eee PC 1001P or an MSI Wind U100 or an Point of View Mobii II (click the links for specs; nevermind that the rest is German). I'm not in the USA. Whatever I buy will most likely have Windows 7 on it but no optical drive. I would also buy a large-ish USB stick but not an external optical drive. Should I (and can I) install Ubuntu alongside Windows 7, or remove Windows? If I remove Windows first, how would I be able to reinstall it if I change my mind? Can I make a backup? Is a recovery CD usually provided? Should I choose the regular Ubuntu, or the Ubuntu Netbook Remix (UNR)? Does UNR allow me to install additional applications just as easily? Note: I'm asking about Ubuntu vs. Windows; let's skip the hardware discussion for now. Edit: I'm assuming that Windows is already installed; if it isn't then I would only install Ubuntu and this question is irrelevant.

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  • USB Hardware vs. Software Write Lock

    - by TreyK
    I'm in the market for a USB flash drive, and remember this cool feature a tiny 32MB flash drive of mine had: a write lock switch. This seemed like it would be an amazing feature to have as a shield against any nastiness happening to the drive on an unfamiliar computer. However, very few drives on the market offer this feature. Instead, it seems that forms of software protection are the more prominent method. This software protection causes me a bit of uneasiness, as it seems like this software wouldn't be nearly as bulletproof as a physical switch. Also, levels of protection seem to vary from product to product. Being able to protect certain folders from reading and/or writing would be nice, but is the security trade-off worth it? Just how effective can this software protection be? Wouldn't a simple format be able to clean any drive with software protection? My drive must also be compatible with Windows XP, Vista, and 7, as well as Linux and Mac. What would be the best way forward for getting a well-sized (~8GB) flash drive with a strong write protection implementation, for little or no more than a regular drive? Thanks.

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  • Configure ApacheDS 1.5 with accessControlEnabled=true for authenticated access

    - by cmyers
    I need to set up an apacheDS instance. I am using standalone 1.5.5 on Linux. I have removed the example partition and added two of my own, each with their own suffixes. I have imported LDIFs for the two partitions and everything looks correct data-wise. I need to configure ApacheDS to disallow anonymous access. I was able to do that by following some of the directions here: http://directory.apache.org/apacheds/1.5/145-enable-and-disable-anonymous-access.html http://directory.apache.org/apacheds/1.5/32-basic-authorization.html Now only the administrator account (uid=admin,ou=system) can log in and make queries. I need to establish an admin account, and a "regular user" account which can read and write only certain entries within each partition. I tried to read the above docs and I got nuthin'. The second page "basic authorization" is completely incomprehensible to me. When I tried to add a "prescriptiveACI" to it using Apache Directory Studio, I get: Administration point 2.5.4.11=abc,2.5.4.10=efg does not contain an administrativeRole attribute! An administrativeRole attribute in the administrative point is required to add a subordinate subentry. where my partition is "ou=abc,o=def". I have no clue what is going on and the docs are really not helping, I am at a complete loss here. How can it possibly be this hard to just restrict access? P.S. can someone with proper rep please change the tag "apache" to the new tag "ApacheDS"?

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  • Login box not shown on Ubuntu

    - by Alexandre
    I've installed Ubuntu 10.04 (64bit) as a guest OS in VirtualBox, using Windows7 Professional (64bit) as host. After Ubuntu install, I did installed Xfce4 (sudo apt-get install xfce4). Logged in using a Xfce session, and when I logged out, I couldn't see the login box anymore, only the regular gnome background from login screen. Then I restarted the virtual machine, and now I'm not able to see the login box anymore, only the gnome background. Does someone knows how to solve this? Thanks in advance Update: I've tried to use Xubuntu, that comes with Xfce. And I'm facing the same problem. As a common denominator from the two cases, now I see the problem arises after I've updated the system, and then installed curl (via apt-get), zlib (make process), git (make process). But I'm not sure this can be the cause for this ... Update: I isolated the problem. The bad guy is zlib, but I don't have a clue why. In fact, it does crash not only ubuntu and xubuntu, but also Debian (Yes, I've tested all). I'll keep this question in case someone have the same problem, but I think my initial question is not valid anymore.

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  • Java Plugin a huge security risk? How to preseve Java plugin from privilege escalation?

    - by Johannes Weiß
    Installing a regular Java plugin is IMHO a real security risk for non-IT people. Normally Java applets run in a sandbox and the applet cannot do anything harmful to your computer. If an applet, however, needs to do something like read-only accessing your filesystem e.g. uploading an image, you have to give it more privileges. Usually that's ok but I think not everyone knows that you give the applet the same privileges to your computer as your user has! And that's everything Java asks you: That looks as 'harmful' as a self-signed SSL certificate on a random page where no sensitive data is exchanged. The user will click on Run! You can try that at home using JyConsole, that's Jython (Python on Java)! Simply type in python code, e.g. import os os.system('cat /etc/passwd') or worse DON'T TYPE IN THAT CODE ON YOUR COMPUTER!!! import os os.system('rm -rf ~') ... Does anyone know how you can disable the possibily of privilege escalation? And by the way, does anyone know why SUN displays only a dialog as harmless as the one shown above (the self-signed-SSL-certificate-dialog from Firefox 3 and above is much clearer here!)? Live sample from my computer:

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  • Java plugin in the browser doesn't work even though it is enabled

    - by Pratyush Nalam
    I installed the Java Development Kit (64-bit) recently and saw it includes the JRE plugin for 64-bit as well. But, since Firefox is 32-bit, I also installed JRE 32-bit version. This is what is shown in Programs and Features. Now, the problem is, the other day, I opened a site which required the Java plugin. The frame showed the regular Java loading animation and hung. Nothing happened after that. Like this: I checked Firefox's plugins section and it shows Java is enabled, so no issue there I tried other browsers - IE10 and Chrome but to no avail. It doesn't work anywhere. I saw another question which said that you have to install 64-bit then 32-bit. That's what I actually did as well. First, installed JDK 7 64-bit (which includes JRE 7 64-bit) and then installed JRE 7 32-bit. I even tried the Java website's Do I have Java? section and over there too, it just keeps spinning for ages (I have waited for more than 10-20 seconds). How do I go about now? This never happened to me in Windows 7. I am on Windows 8 Pro.

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  • How do I improve my incremental-backup performance?

    - by Alistair Bell
    I'm currently using the traditional rsync+cp -al method to create incremental/snapshot backups of our server tree. The backups are going onto a pair of eight-disk towers connected to the backup machine (a Sandy Bridge machine with 16 GB of RAM, running CentOS 5.5) via four eSATA connections (four disks per connection). Each disk is a regular 2 TB disk, so we have 32 TB of disk space connected to the backup machine. We're backing up about 20 TB of data on the servers with this. The problem is that each daily backup is taking more than 24 hours, and the real time-killer isn't the actual rsync, but the time it takes to perform a cp -al of the tree locally on the backup machine. It's taking more than 12 hours just to make the shadow copy of the tree, and as far as I can tell the performance backlog is at the disk (top shows the cp using a lot of RAM but not a lot of CPU and mostly in uninterruptible-sleep state) We have the server data split into four major volumes (and a few minor ones), and each of these backups runs in parallel (with some offsets in the cron to try to get some disks' cp done first). There are two volumes on the backup drive, both striped LVM volumes of 16 TB each. So obviously I need to improve the performance because it's unusable as it stands. The first question is: when CentOS 6 comes out, with support for btrfs, will making snapshots of subvolumes with btrfs substantially increase this performance? The second is: is there a way, with ext3 or something else supported in CentOS 5 or 6, to 'encourage' it to put the directories/inodes in one part of a volume (which could happen to be the part that's on an SSD, via LVM) and the files in another? That would presumably solve the problem, but I don't know of ways to hint ext3 like that.

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  • mdadm+zfs vs mdadm+lvm

    - by Alex
    This may be a naive question since I'm new to this and I cannot find any results about mdadm+zfs, but after some testing it seems it might work: The use case is a server with RAID6 for some data that is backed-up somewhat infrequently. I think I'm well served by any of ZFS or RAID6. Platform is Linux. Performance is secondary. So the two setups I am considering are: A RAID6 array plus regular LVM and ext4 A RAID6 array plus ZFS (without redundancy). Is this second option that I don't see discussed at all. Why ZFS+RAID6? It's mainly because the inability of ZFS to grow a raidz2 with new disks. You can replace disks with larger ones, I know, but not add another disk. You can accomplish 2-disk redundancy and ZFS disk growth using mdadm as the redundancy layer. Besides that main point (otherwise I could go directly to raidz2 without RAID under it), these are the pros-cons that I see for each option: ZFS has snapshots without preallocated space. LVM requires preallocation (might be no longer true). ZFS has checksumming (very interested in this) and compression (nice bonus). LVM has online filesystem growth (ZFS can do it offline with export/mdadm --grow/import). LVM has encryption (ZFS-on-Linux has not). This is the only major con of this combo I see. I guess I could go RAID6+LVM+ZFS... seems too heavy, or not? So, to close with a proper question: 1) Is there anything that inherently discourages or precludes RAID6+ZFS? Anyone has experience with a setup like this? 2) Are there possibilities for checksumming and compression that would make ZFS unnecessary (maintaining the possibility of filesystem growth)? Because the RAID6+LVM combo seems the sanctioned, tested way.

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  • Why do AWS spot-instance prices spike above the "on demand" pricing?

    - by Laykes
    Amazon Pricing on Spot Instance Inconsistencies This is something which will be best explained through screenshots of a historical chart of instance pricings. If you look at a lot of the instance prices for spot instances, you will notice regular patterns of spikes. See here: As you can see, the price for this compute medium instance, regularly spikes above the on demand price. A c1.medium instance (on demand), would only cost $0.186 per hour. But for a period of a few weeks, in zone B, the price would regularly spike to $1.20. This is some 6 times the actual on demand price. It's also not isolated. If you look at zone-b again for small instances, there is a similar, spike frequently. Which goes 4x the on demand pricing. Does anyone know why this happens? Here are a few suggestions Someone entered $1.2 instead of $0.12 (I would discount this since it happened 20 times over the space of 3 weeks). Amazon regularly artifically inflate their prices by bidding on their own instances to get the most bang for their buck. (I would discount this since it would be ridiculous and bad business) Some company launched 1000 servers at once, and wants to make sure that they all launch. (I would discount this since they would presumably launch them at a price which would be below the minimum on demand price. Why would you pay above on demand for a single server?). It's a bug in their reporting?

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  • VMware databursts to vCenter

    - by Erwin Blonk
    [edit Nov.16th 2009: Thank you for the responses. I'm no longer on this project so the problem is out of my hands. Be sure I will return with other problems :-) ] I have a strange occurence of regular databursts over my WAN links from 2 sites to a site with vCenter. What happens is that a vCenter server is managing local ESX 3.5 servers and 2 from 2 sites across a WAN link. Each server sends an approximately 3MB worth of TLS data (less than 10% of the time it varies to higher or lower) every 15 minutes (with a margin of 2 minutes). So far, I've not been able to single out a process that causes it. I looked through all applications on each site. So far, it seems to originate from one server on each site. Although it may be coincidence and therefore not relevant, I found that one server, with very few exceptions, does a burst at 00:00 on the hour. The other 3 during the hour are a bit off the 15 minute mark but back at the top of the hour, you can sync your watch on it. The other server follows 5 minutes after that with no such precision. But, as said, it never differs more than 2 minutes. Servers are ESX 3.5, vCenter is 2.5.

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  • How to disable all bounce back email in exim 4.69

    - by liame
    I have set up an email server to send out solicited newsletters. There should be no "regular" users of this server, so it is not desirable to send bounce notifications back to the recipient. Especially so since I am tracking bounces myself by parsing the log files periodically. What I want is to unconditionally prevent exim from ever sending a bounce notification email back to a sender. How can I do this? Thank you! (I accidentally posted this to superuser before posting it here, disregard that if you come across) What I want is an email server that will accept all incoming emails, deliver it accordingly (that is remotely or locally) and not send a bounce notification the sender upon bounce. I log bounces myself, in a database. The only function bounce messages have in my setting is to waste resources and bandwidth. I need to send emails fast, using exiwhat during a run, I see a significant number of deliveries to [email protected]. I could potentially increase my email productivity by 10~20% if all bounce emails are eliminated.

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  • Windows Server 2008 Create Symbolic Link, updated Security Policy still gives privilege error

    - by Matt
    Windows Server 2008, RC2. I am trying to create a symbolic/soft link using the mklink command: mklink /D LinkName TargetDir e.g. c:\temp\>mklink /D foo bar This works fine if I run the command line as Administrator. However, I need it to work for regular users as well, because ultimately I need another program (executing as a user) to be able to do this. So, I updated the Local Security Policy via secpol.msc. Under "Local Policies" "User Rights Management" "Create symbolic links", I added "Users" to the security setting. I rebooted the machine. It still didn't work. So I added "Everyone" to the policy. Rebooted. And STILL it didn't work. What on earth am I doing wrong here? I think my user is even an Administrator on this box, and running plain command line even with this updated policy in place still gives me: You do not have sufficient privilege to perform this operation.

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  • Fedora-13 not detecting USB HDD enclosure (with HDD)

    - by Ramy
    I recently purchased this enclosure: http://www.amazon.com/Inland-2-5-Inc.../dp/B003SZ2Y12 and this HDD: http://www.amazon.com/Seagate-Barrac...3811667&sr=8-1 Now, I let my brother in law use the enclosure with his 160GB disk to back some stuff up. He then gave me that disk in my enclosure and I backed up my computer and my fiances computer. So...obviously, i had no problem mounting that disk. I plan on keeping this disk as my "natural disaster backup" (in case my apartment building burns down, i still have that disk with my stuff backed up). I want to use the 1.5T disk as my regular/more frequent backup device, but it doesn't seem to be mounting to my F-13 machine. I searched through this forum and found someone advising to run the following: # mount -t vfat /dev/sda1 /mnt this is the output i get when I run that: mount: /dev/sda1 already mounted or /mnt busy mount: according to mtab, /dev/sda1 is mounted on /boot Thing is, shouldn't this disk automatically mount just like the LAST disk in the same enclosure with the same USB cable and power supply? Any help would be greatly appreciated. THANKS!

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  • Can't remotely connect through SQL Server Management Studio

    - by FAtBalloon
    I have setup a SQL Server 2008 Express instance on a dedicated Windows 2008 Server hosted by 1and1.com. I cannot connect remotely to the server through management studio. I have taken the following steps below and am beyond any further ideas. I have researched the site and cannot figure anything else out so please forgive me if I missed something obvious, but I'm going crazy. Here's the lowdown. The SQL Server instance is running and works perfectly when working locally. In SQL Server Management Studio, I have checked the box "Allow Remote Connections to this Server" I have removed any external hardware firewall settings from the 1and1 admin panel Windows firewall on the server has been disabled, but just for kicks I added an inbound rule that allows for all connections on port 1433. In SQL Native Client configuration, TCP/IP is enabled. I also made sure the "IP1" with the server's IP address had a 0 for dynamic port, but I deleted it and added 1433 in the regular TCP Port field. I also set the "IPALL" TCP Port to 1433. In SQL Native Client configuration, SQL Server Browser is also running and I also tried adding an ALIAS in the I restarted SQL server after I set this value. Doing a "netstat -ano" on the server machine returns a TCP 0.0.0.0:1433 LISTENING UDP 0.0.0.0:1434 LISTENING I do a port scan from my local computer and it says that the port is FILTERED instead of LISTENING. I also tried to connect from Management studio on my local machine and it is throwing a connection error. Tried the following server names with SQL Server and Windows Authentication marked in the database security. ipaddress\SQLEXPRESS,1433 ipaddress\SQLEXPRESS ipaddress ipaddress,1433 tcp:ipaddress\SQLEXPRESS tcp:ipaddress\SQLEXPRESS,1433

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  • Time drift in Cloud Server - need to mainpulate GRUB config

    - by Aditya Advani
    We are hosting a VPS on a popular host and are experiencing a regular time drift of several minutes a day forward (approx 7). Linux Kernel: 2.6.18-164.11.1.el5 GNU/Linux Distro: CentOS release 5.4 (Final) We reached out to our hosting provider and their support advised us " This is a known issue with Cloud Servers. To fix this you will need to add one line to your grub config located at: /boot/grub/menu.lst The line you need to add is: noapic nolapic divider=10 nolapic_timer This should correct this issue. You will need to restart after this is added in. " Because I am wary of manipulating grub, mostly I'm terrified that our server may fail to restart - I ask you guys, the pro *nix admins - where exactly in this file does the recommended insertion below: # line from 1&1 for time syncing issue (Case 5163) noapic nolapic divider=10 nolapic_timer go? Please specify where exactly, and whether the order of commands is or is not important. Why is the block below "title CentOS ..." indented? If someone could give me an overview of how this works or point me to a resource that's easy to follow, that's what I'm looking for immediately, a light overview or basic understanding of what I;m doing. If GRUB and bootloaders are a deep dark treasure trove of kernel hacking or something, that's great well-recommended in-depth resources are also very welcome. This is my current /boot/grub/menu.lst # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file #boot=/dev/sda # serial --unit=0 --speed=57600 terminal --timeout=5 serial console timeout=5 title CentOS (2.6.18-164.11.1.el5) root (hd0,0) kernel /boot/vmlinuz-2.6.18-164.11.1.el5 ro root=/dev/hda1 console=tty0 console=tty initrd /boot/initrd-2.6.18-164.11.1.el5.img MOST IMPORTANT: I need to know where in the file above it is appropriate to paste the suggested line so I can confidently restart my VPS after manipulating GRUB config

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  • Installing MySQL on Ubuntu Natty with Shell Script

    - by Obi Hill
    I'm trying to install MySQL on Ubuntu Natty from a shell script. However, I keep running into one major issue: when I try to define the password outside of the shell script. Below is the code to my shell script (which I have saved in /etc/init.d/install_mysql: export DEBIAN_FRONTEND=noninteractive echo mysql-server-5.1 mysql-server/root_password password $dbpass | debconf-set-selections echo mysql-server-5.1 mysql-server/root_password_again password $dbpass | debconf-set-selections apt-get -y install mysql-server So what I enter in the terminal is: dbpass="mysqlpass" chmod +x /etc/init.d/install_mysql /etc/init.d/install_mysql MySQL installs, but it installs without a password, so I can just do something like mysql -uroot to access mysql (which I don't want). The funny thing is if I put the password in the shell script as regular text, it works ok. So if I my install script is as follows, everything works (i.e. I must specify a password to access mysql): export DEBIAN_FRONTEND=noninteractive echo mysql-server-5.1 mysql-server/root_password password mysqlpass | debconf-set-selections echo mysql-server-5.1 mysql-server/root_password_again password mysqlpass | debconf-set-selections apt-get -y install mysql-server Is there a way I can use a shell script variable to define my password in the shell script, instead of entering the password literally?! Thanks in advance. EDIT I've found the answer to this. The following is what I should have entered in the terminal: dbpass="mysqlpass" export dbpass chmod +x /etc/init.d/install_mysql /etc/init.d/install_mysql It works like a charm now.

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