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  • Ubuntu 10.04 freezing and Ctrl + Alt + Backspace does nothing but music keeps playing

    - by Bryce Thomas
    I'm having intermittent problems where the screen will freeze in Ubuntu. I've tried using Ctrl + Alt + Backspace to restart the X-server, though this does nothing. When the freeze occurs, there's a small square of black dashes around the mouse pointer - maybe 1 inch in size. These dashes look a lot like a 2d barcode. The rest of the screen looks normal, but I can't move the mouse and none of the keyboard shortcuts work to do anything. However, music that I begin playing before the freeze continues to play, which seems to indicate it hasn't stalled up completely. I've noticed a similar freezing problem when I'm using Windows 7. That is, I see the same barcode like dashes around the mouse pointer when it freezes up. So I'm guessing it's either a driver or hardware problem. I thought if it was a hardware problem though, the whole computer might stop working (i.e. music would stop playing)? The video card I am using is an Nvidia, and I believe it's in the 7600 range. In Ubuntu I have the drivers for the card set to the latest available (proprietary). Ideally I'd like to be able to continue using the proprietary drivers. Is there any known issues with the drivers for this model graphics card, or has anyone experienced the same problem and knows how to fix it?

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  • MySQL open files limit

    - by Brian
    This question is similar to set open_files_limit, but there was no good answer. I need to increase my table_open_cache, but first I need to increase the open_files_limit. I set the option in /etc/mysql/my.cnf: open-files-limit = 8192 This worked fine in my previous install (Ubuntu 8.04), but now in Ubuntu 10.04, when I start the server up, open_files_limit is reported to be 1710. That seems like a pretty random number for the limit to be clipped to. Anyway, I tried getting around it by adding a line like this in /etc/security/limits.conf: mysql hard nofile 8192 I also tried adding this to the pre-start script in mysql's upstart config (/etc/init/mysql.conf): ulimit -n 8192 Obviously neither of those things worked. So where is the hoop that has been added between Ubuntu 8.04 and 10.04 through which I must jump in order to actually increase the open files limit?

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  • Shell script to control user initiated processes

    - by Gnanam
    Hi, I'm not a shell script expert. I'm looking for a shell script which checks for maximum number of Java processes (MyJavaStandalone) running in the system before starting/executing the current Java process. Example: Script: /home/myfolder/script.sh script.sh contains /usr/java/jdk1.6.0/bin/java MyJavaStandalone >> $DATE.log & Here, before executing "MyJavaStandalone", if there are already 10 processes running, then this current process should not be started.

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  • rc.local is not executed on bootup ubuntu

    - by Alexander
    Im on Ubuntu 10.04. I want to execute script on system boot. I added it to rc.local. If I execute rc.local manually it works fine. If I boot system in recovery mode(2nd string in boot menu) it also works fine. But if I boot normally it is not executed. However i added sleep 20 to my script and there is a pause at the end of boot process, but nothing more is executed. Thanks I think, it soesnt depend on contents of the script but anyway #!/bin/sh -e sleep 20 sudo service ssh start su -c 'service pgsql start' postgres sudo svnserve -d su -c 'hamachi start' root su -c 'hamachi login' root exit 0

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  • openSSL tutorial not fully working - Can sign but cannot restore original file

    - by djechelon
    I'm writing, and testing, a little tutorial for my groupmates involved in an openSSL homework. We have a bunch of PDF files, I'm the CA and each one should send me a signed PDF for me to be verified. I've told them to do the following (and tried to do it by myself) Request and obtain a certificate (I'll skip this part) Create a MIME message with the PDF file in it makemime -c "text/pdf" -a "Content-Disposition: attachment; filename=”Elaborato.pdf" Elaborato.pdf > Elaborato.pdf.msg Sign with openSSL openssl smime -sign -in Elaborato.pdf.msg -out Elaborato.pdf.p7m -certfile ca.pem -certfile nomegruppo.crt -inkey nomegruppo.key -signer nomegruppo.crt Verify with openssl smime -verify -in Elaborato.pdf.p7m -out Elaborato-verified.msg -CAfile ca.pem -signer nomegruppo.crt Extract attachment with munpack Elaborato-verified.msg View with Acrobat Reader The problem is that even if I get a file that (from its binary content) resembles a PDF file my current Ubuntu PDF viewer doesn't read it. The XXXElaborato.pdf extracted by munpack is a little bit smaller than the original. What's the problem with this procedure? In theory, they should send me the signed S/MIME message and I should be able to read the PDF within it. Why can't I restore the original content of the PDF file?

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  • Where is the encfs volume key stored?

    - by Waldorf
    I am trying to use encfs in reverse mode. I understand that the passphase is used to encrypt a key which is then stored encrypted into the encfs6.xml file. What I do not understand is the following. Create en encrypted virtual fs of a folder by using passphrase A unmount this folder. Delete all contents including the encfs6.xml file If you then try to do the same with another passphrse I would expect that a new encfs6.xml would be created. However I get the following error message: "Error decoding volume key, password incorrect" So I wonder, what volume key is incorrect, I thought it was in the encfs6.xml file ?

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  • Prevent udev / uevents looking up DVD at boot time

    - by Sampo
    Problem: Boot time delay caused by udev. Early after initscripts starts there is message saying waiting for uevents to be processed and causing delay on boot, it seems that udev is looking if there is disc in dvd tray. After udev has found disc, boot process continues normally. Main question: How to prevent udev dvd lookup at boot time? Maybe there is some way to skip some udev related stuff and let boot process continue and then later instruct udev to do stuff that may cause some delay (delay in uevents, but not in main boot process, is acceptable after udev is initially loaded).

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  • How to automaticaly mount luks-partition only when disk is plugged in

    - by Frederick Roth
    I have the following scenario: I want to automatically backup some data from my Laptop(Fedora Core 17) to a external encrypted(luks) hard disk. The disk can be opened by a key file, which lies on the also encrypted root partition of my laptop. The hard disk is attached to my docking station and therefore only "present" when I am at home (which is approximately 1/2 of the time the Laptop runs) I have everything set up the way I want it with one exception. I don't get a decent way to mount the hard disk automatically at boot if and only if it is present. If I add it to crypttab and fstab without noauto it tries to mount it at boot and takes a lot(!) of time and error messages when it is not present. If I add noauto, well it does not mount automatically ;) Is there a way to configure luks/crypttab to do the following: check whether the disk is present if yes: decrypt/mount if no: just don't

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  • Http to https behavior for visits from Internet Explorer client

    - by Emile
    My website has an SSL cert (example url: https://subdomain.example.com). Under Apache it's set up for both port 80 and port 443. So under the following configuration, anyone who goes to http://subdomain.example.com is sent to https://subdomain.example.com . But for visits from Internet Explorer, the redirect doesn't happen. Instead, http visits get a "Internet Explorer cannot display the web page." with a list of client-side solutions to try. Any ideas on how to fix the config so IE visits have the same behavior as the other browsers (that is, send http to https automatically)? NameVirtualHost *:443 <VirtualHost *:80> DocumentRoot /var/www/somewebroot ServerName subdomain.example.com </VirtualHost> <VirtualHost *:443> DocumentRoot /var/www/somewebroot ServerName subdomain.example.com # SSL CERTS HERE </VirtualHost> *Tested IE8, IE9 beta

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  • How would I force Debian to use the physical sector size on a hard disk?

    - by Confused User
    I just purchased a few new 3TB WD drives. These have physical 4k sectors, but there is some sort of layer which is providing 512B logical sectors (see the partition table below). In order to attempt to get some more speed out of my hard drives, I would like to get rid of this logical layer and actually use the physical 4k sectors. However, I can't figure out how to do this (or even if it's possible) from the man pages of fdisk and parted, or from searching Google. Does anybody know how this could be done? As to why this is relevant, this page demonstrates that meerly aligning the sectors properly can already make up to a 25% speed difference for reads, and more than 2500% for writes in some cases! Getting rid of the logical sectors in favor of the physicals ones should improve speeds even more. Thanks! $ parted /dev/sdc GNU Parted 2.3 Using /dev/sdc Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) print Model: ATA WDC WD30EZRX-00M (scsi) Disk /dev/sdc: 3001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 3001GB 3001GB zfs 9 3001GB 3001GB 8389kB P.S. I don't care about the data on the drives, I was just playing with different file systems. Also, this is my first time posting here, so please let me know if my posts should be formatted differently, etc.

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  • Tips and tricks to make NX server more stable

    - by gareth_bowles
    My shop has been using the FreeNX server on Fedora 11 for a while now and mostly getting good results, especially with performance, but we have some annoying problems with client connections. There are two main issues: Client sessions sometimes freeze after a long time (seems to be at least 2 hours of having the session active) We often have to make multiple attempts to start a new client session, especially if a previous session was suspended rather than terminated. In qwuite a few cases, we've had to restart the NX server to get around this. Our NX server configuration is the default except that we've enabled logging level 7 to /var/log/nxserver.log, and set the font server to "unix:/7100" so that it uses xfs. Does anyone have any ideas for making things more stable ?

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  • Ubuntu init.d script not being called on startup

    - by Mike
    I've got a script in ubuntu 9.04 in init.d that I've set to run on start on with update-rc.d using update-rc.d init_test defaults 99. All of the symlinks are there and the permissions appear to be correct -rwxr-xr-x 1 root root 642 2010-10-28 16:44 init_test mike@xxxxxxxxxx:~$ find /etc -name S99* | grep init_test find: /etc/rc5.d/S99init_test find: /etc/rc4.d/S99init_test find: /etc/rc2.d/S99init_test find: /etc/rc3.d/S99init_test The script runs through source and ./ without issue and behaves correctly. Here is the source of the script: #!/bin/bash ### BEGIN INIT INFO # Provides: init test script # Required-Start: $remote_fs $syslog # Required-Stop: $remote_fs $syslog # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: Start daemon at boot time # Description: Enable service provided by daemon. ### END INIT INFO start() { echo "hi" echo "start called" >> /tmp/test.log return } stop() { echo "Stopping" } echo "Script called" >> /tmp/test.log case "$1" in start) start ;; stop) stop ;; *) echo "Usage: {start|stop|restart}" exit 1 ;; esac exit $? When the machine starts, I don't see "script called" or "start called" in the test.log at all. Is there anything obvious I'm messing up?

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  • iptables not writing rules.

    - by Darkmage
    im running these two rules as root, but when doing a iptables -L it dosent show any rules, any one have an idea of what the problem can be? iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 --source 84.244.145.135 -j REDIRECT --to-port 1222 iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 --source 243.134.97.194 -j REDIRECT --to-port 1222 duno@Virtual-Box:/home/glennwiz# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination

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  • Are these mySQL user settings vulnerable?

    - by Kavon Farvardin
    I'm using myphpadmin to manage the databases and I'm new to SQL in general. Am I suppose to keep an open anonymous user on localhost so things like drupal can access mySQL? It seems like having a non-passworded root on my server's hostname is retarded but I don't know what I'm doing with this in general. The user who's name starts with a b is the one I use to login and do things like make a database.

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  • Using public interfaces on a server connected through a GRE tunnel

    - by Evan
    I'm pretty new to networking so please forgive any terminology mistakes. I have 2 servers connected with a GRE tunnel. Server1 (10.0.0.1) ---- Server2 (10.0.0.2) I want to be able to bind to the public IPs on Server2 using Server1. To do this, I setup virtual interfaces with Server2's public IPs on Server1 and then used routing rules on Server1 to route the packets through the GRE tunnel. On Server1: ip rule add from [Server2's first public IP] table gre ip rule add from [Server2's second public IP] table gre ip route add default via 10.0.0.2 dev gre1 table gre This works great and I can see the packets arriving via GRE on Server2. I can see the packet exiting the tunnel on Server2's gre1 device as shown: From Server1: ping -I [Server2's public ip] google.com tcpdump from Server2's GRE tunnel device: 12:07:17.029160 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84) [Server2's public ip] > 74.125.225.38: ICMP echo request, id 6378, seq 50, length 64 This is exactly the packet I want. However, I'm not seeing it go out at all on eth0:0 (where Server2's public IP is bound to). I've tried to use routing rules to get packets coming from Server2's public IP (which would be coming out of dev gre1) to go through dev eth0 on the public default gateway and that doesn't work either. I'm at a loss, thank you to anyone who can help.

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  • How to view bad blocks on mounted ext3 filesystem?

    - by Basilevs
    I've ran fsck -c on the (unmounted) partition in question a while ago. The process was unattended and results were not stored anywhere (except badblock inode). Now I'd like to get badblock information to know if there are any problems with the harddrive. Unfortunately, partition is used in the production system and can't be unmounted. I see two ways to get what I want: Run badblocks in read-only mode. This will probably take a lot of time and cause unnecessary bruden on the system. Somehow extract information about badblocks from the filesystem iteself. How can I view known badblocks registered in mounted filesystem?

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  • How to prevent unison syncronize file when file process uploading

    - by user134600
    I use CentOS 5.8 Final. My situation is I running unison with cron where script below : */1 * * * * /usr/bin/unison /dev/null 2&1 and default profile like below : root = /var/www root = ssh://web02.example.com//var/www auto=true batch=true confirmbigdel=true fastcheck=true group=true owner=true prefer=newer silent=true times=true So in every minutes will syncronized www folder . My problem are : I upload file with size bigger than 10 MB to www from client with user1 permission where www folder is user1 owner. file in processing uploading then unison running in that minute and suddenly file upload owner changed to root:root When I editing file in www folder then I save when unison running, file owner changed to root:root where should be user1:user1 Is there anyone know about this problem?

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  • Exploratory Question for Security Admins (/etc/passwd + PHP)

    - by JPerkSter
    Hi everyone, I've been seeing a few issues lately on a few of my servers where an account gets hacked via outdated scripts, and the hacker uploads a cPanel / FTP Brute forcing PHP script inside the account. The PHP File reads /etc/passwd to get the usernames, and than uses a passwd.txt file to try and brute force it's way in to 127.0.0.1:2082. I'm trying to think of a way to block this. It doesn't POST anything except "GET /path/phpfile.php", so I can't use mod_security to block this. I've been thinking of maybe changing permissions on /etc/passwd to 600, however I'm unsure how this will result in regards to my users. I was also thinking of rate-limiting localhost connections to :2082, however I'm worried about mod_proxy being affected. Any suggestions?

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  • How can I configure Cyrus IMAP to submit a default realm to SASL?

    - by piwi
    I have configured Postfix to work with SASL using plain text, where the former automatically submits a default realm to the latter when requesting authentication. Assuming the domain name is example.com and the user is foo, here is how I configured it on my Debian system so far. In the postfix configuration file /etc/main.cf: smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = $mydomain The SMTP configuration file /etc/postfix/smtpd.conf contains: pwcheck_method: saslauthd mech_list: PLAIN The SASL daemon is configured with the sasldb mechanism in /etc/default/saslauthd: MECHANIMS="sasldb" The SASL database file contains a single user, shown by sasldblistusers2: [email protected]: userPassword The authentication works well without having to provide a realm, as postifx does that for me. However, I cannot find out how to tell the Cyrus IMAP daemon to do the same. I created a user cyrus in my SASL database, which uses the realm of the host domain name, not example.com, for administrative purpose. I used this account to create a mailbox through cyradm for the user foo: cm user.foo IMAP is configured in /etc/imapd.conf this way: allowplaintext: yes sasl_minimum_layer: 0 sasl_pwcheck_method: saslauthd sasl_mech_list: PLAIN servername: mail.example.com If I enable cross-realm authentication (loginrealms: example.com), trying to authenticate using imtest works with these options: imtest -m login -a [email protected] localhost However, I would like to be able to authenticate without having to specify the realm, like this: imtest -m login -a foo localhost I thought that using virtdomains (setting it either to userid or on) and defaultdomain: example.com would do just that, but I cannot get to make it work. I always end up with this error: cyrus/imap[11012]: badlogin: localhost [127.0.0.1] plaintext foo SASL(-13): authentication failure: checkpass failed What I understand is that cyrus-imapd never tries to submit the realm when trying to authenticate the user foo. My question: how can I tell cyrus-imapd to send the domain name as the realm automatically? Thanks for your insights!

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  • Setting up NFS server on Gentoo

    - by StackedCrooked
    I'm trying to set up an NFS server on a Gentoo VM. I've installed nfs-utils-1.2.2 and added the following line to the /etc/exports file: /root/svn 10.0.0.0/255.0.0.0(rw,sync,no_subtree_check) However, when I try to start the nfs service I get the following errors: gentoo-amd64-francis orig # /etc/init.d/nfs start FATAL: Could not load /lib/modules/2.6.24-9-pve/modules.dep: No such file or directory * Exporting NFS directories ... [ ok ] * Starting NFS mountd ... [ !! ] * Starting NFS daemon ... [ !! ] * Starting NFS smnotify ... [ ok ] It complains about not finding the /lib/modules/2.6.24-9-pve/modules.dep file, but the /lib/modules directory doesn't even exist on this machine. Can anyone help me getting it to work?

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  • What does this RPC error message mean?

    - by user161834
    I have OS RHNL release 6.2 and use the NFS service (nfs-utils-1.2.3) to connect to NFS server, And found a lot of messages in a file /var/log/messages: Apr 1 11:08:35 XXX rpc.idmapd[3010]: nss_getpwnam: name '2' does not map into domain 'XXXX.com' Apr 1 11:14:26 XXX rpc.idmapd[3010]: nss_getpwnam: name '0' does not map into domain 'XXXX.com' Apr 1 11:18:36 XXX rpc.idmapd[3010]: nss_getpwnam: name '2' does not map into domain 'XXXX.com' Apr 1 11:24:27 XXX rpc.idmapd[3010]: nss_getpwnam: name '0' does not map into domain 'XXXX.com' Apr 1 11:28:37 XXX rpc.idmapd[3010]: nss_getpwnam: name '2' does not map into domain 'XXXX.com' Apr 1 11:34:27 XXX rpc.idmapd[3010]: nss_getpwnam: name '0' does not map into domain 'XXXX.com' Apr 1 11:38:37 XXX rpc.idmapd[3010]: nss_getpwnam: name '2' does not map into domain 'XXXX.com' Apr 1 11:44:28 XXX rpc.idmapd[3010]: nss_getpwnam: name '0' does not map into domain 'XXXX.com' Apr 1 11:48:37 XXX rpc.idmapd[3010]: nss_getpwnam: name '2' does not map into domain 'XXXX.com' What does this message mean ?

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