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• FreeNX Server w/ nxagent 3.5 not able to create shadow sessions

  - by Jenna Whitehouse

  I am running a FreeNX server on Ubuntu 11.10 and am unable to do session shadowing. I get the authorization prompt, but the shadow client crashes after. The NX server log in the user's .nx directory is as follows: Error: Aborting session with 'Server is already active for display 3000 If this server is no longer running, remove /tmp/.X3000-lock and start again'. Session: Aborting session at 'Mon Oct 1 14:26:44 2012'. Session: Session aborted at 'Mon Oct 1 14:26:44 2012'. This then deletes the lock file, which is the lock file for the initial Unix session and crashes out. Everything works for a normal session, and shadowing works up to the authorization prompt. I am using this software: Ubuntu 11.10 freenx-server 0.7.3.zgit.120322.977c28d-0~ppa11 nx-common 0.7.3.zgit.120322.977c28d-0~ppa11 nxagent 1:3.5.0-1-2-0ubuntu1ppa8 nxlibs 1:3.5.0-1-2-0ubuntu1ppa8 Any help is appreciated, thanks!

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• Problems using wondershaper on KVM guest

  - by Daniele Testa

  I am trying to limit bandwidth on one of my KVM guest using Wondershaper. Doing something like this works fine: wondershaper br23 9000 9000 Doing a wget with the setting above gives a download speed of about 1MB/sec like it should. However, it seems this is the highest setting I can use, because setting it to this does not work: wondershaper br23 10000 10000 Doing the same wget with the setting above downloads with full speed, about 70MB/sec in my case. Running a status-check returns the following: qdisc cbq 1: root refcnt 2 rate 10000Kbit (bounded,isolated) prio no-transmit Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 qdisc sfq 10: parent 1:10 limit 127p quantum 1514b divisor 1024 perturb 10sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc sfq 20: parent 1:20 limit 127p quantum 1514b divisor 1024 perturb 10sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc sfq 30: parent 1:30 limit 127p quantum 1514b divisor 1024 perturb 10sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc ingress ffff: parent ffff:fff1 ---------------- Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 class cbq 1: root rate 10000Kbit (bounded,isolated) prio no-transmit Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 class cbq 1:1 parent 1: rate 10000Kbit (bounded,isolated) prio 5 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 class cbq 1:10 parent 1:1 leaf 10: rate 10000Kbit prio 1 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 class cbq 1:20 parent 1:1 leaf 20: rate 9000Kbit prio 2 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 class cbq 1:30 parent 1:1 leaf 30: rate 8000Kbit prio 2 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 What am I doing wrong? Does wondershaper have some kind of upper limit?

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• black backgrounds appear grey on gnome-terminal

  - by Martin DeMello

  Running gnome under Ubuntu Lucid $ env | grep TERM TERM=xterm COLORTERM=gnome-terminal I had to edit both my .muttrc and my vim colorscheme to change the background color from black to none in order to get a proper black background (or, more accurately, to retain the terminal's default black background). Setting it to black resulted in a dark grey background. This only happens with gnome-terminal; konsole, xterm and rxvt are fine.

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• Second DocumentRoot for certain URLS

  - by scrr

  Hello, I have the following setup in my apache-config: <VirtualHost 1.2.3.4:80> ServerName example.com:80 ServerAlias www.example.com DocumentRoot /var/www/page <Location "/blog"> DocumentRoot /var/www/blog </Location> RailsBaseURI / RailsEnv development </VirtualHost> However, Apache tells me, I am not allowed to have a second DocumentRoot. How can I make "www.example.com/blog" point to "/var/www/blog"? I'm sure this is basic, but I just can't find the proper documentation online.

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• How to change permission of my centos if I don't have the root password?

  - by Ali

  I've setup server on mac using virtualbox and my server is centos. but the guy who did it for me he forgot the root password that he setup at the beginning and what happen now is my website have a lot of problem due to the permission issues. So what can I do in order to retrive the password or even to change my permission without using root? The group for my website is apache and I believe I'm not in the same group.

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• lighttpd start/stop/restart script doesn’t work

  - by Claudiu

  Hi, I want to restart lighttpd using */lighttpd restart command, but nothing happens, no message, error, just a new cli line waiting for command. I've examined lighttpd file and lighttpd.conf and they seem to be ok.. What should I do more ?

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• How do hdparm's -S and -B options interact?

  - by user697683

  These two options seem confusing. For example: according to the man page -B 254 "does not permit spin-down". However, testing with -B 254 -S 1 the drive does spin down after 5 seconds. -B Query/set Advanced Power Management feature, if the drive supports it. A low value means aggressive power management and a high value means better performance. Possible settings range from values 1 through 127 (which permit spin-down), and values 128 through 254 (which do not permit spin-down). The highest degree of power management is attained with a setting of 1, and the highest I/O performance with a setting of 254. A value of 255 tells hdparm to disable Advanced Power Management altogether on the drive (not all drives support disabling it, but most do). -S Put the drive into idle (low-power) mode, and also set the standby (spindown) timeout for the drive. This timeout value is used by the drive to determine how long to wait (with no disk activity) before turning off the spindle motor to save power. Under such circumstances, the drive may take as long as 30 seconds to respond to a subsequent disk access, though most drives are much quicker. The encoding of the timeout value is somewhat peculiar. A value of zero means "timeouts are disabled": the device will not automatically enter standby mode. Values from 1 to 240 specify multiples of 5 seconds, yielding timeouts from 5 seconds to 20 minutes. Values from 241 to 251 specify from 1 to 11 units of 30 minutes, yielding timeouts from 30 minutes to 5.5 hours. A value of 252 signifies a timeout of 21 minutes. A value of 253 sets a vendor-defined timeout period between 8 and 12 hours, and the value 254 is reserved. 255 is interpreted as 21 minutes plus 15 seconds. Note that some older drives may have very different interpretations of these values.

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• Raid 5 GPT Partitioning

  - by user39325

  Hi, i have a Dell Poweredge r710 server with five 1 TB disks. All of them are in RAID 5. I was trying to install Centos but it sais "Your boot partition is on disk using GPT Partition...". I read somewhere that centos cant install on 2TB disk, so i made some partiotions smaller, but it's not workin. any idea? p.s. i am going to install Proxmox on that, but Proxmox same doesnt accept 2TB disks...

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• virtual disk image - file or partition

  - by tylerl

  I'm looking at the differences between using a file versus a partition to store a virtual disk image in VM use. The common knowledge is that partition-based images are faster than file-based images because of a decreased overhead. It makes sense, but I've never seen any actual numbers. My own testing bears out a different result. When I benchmark a direct-to-partition virtual disk, then format that same partition with ext4, create a virtual disk image stored on that ext4 filesystem, and then benchmark that, I see no speedup at all for the direct-to-partition virtual disk. Instead on some systems the file-based image is even faster (possibly due to host OS caching or something like that). This test was repeated many times on many systems, with fairly consistent results. So perhaps throwing out the performance justification, is it still considered better to use a partition rather than a virtual disk image? Is there some other reason why direct partition access is better than image files? Or perhaps is there some reason to go the other way around? Perhaps an advantage in one of the virtual disk file formats that you don't get with raw partition images?

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• Run a pool of processes in shell

  - by viraptor

  I'm looking for an easy method to run N selected processes at the same time with one command. It should put all the output on my terminal and shut down all of them when I exit with ctrl+c. Is there any existing app that does this? I'm thinking of some thing like exec_many 10 foo - it should keep 10 foos running and respawn any that dies.

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• Why Ubuntu could treat hosts file so strange?

  - by z4y4ts

  I have almost fresh Ubuntu desktop box. OS was installed two weeks ago and updated from karmic repositories. Last week I had no problems with DNS. But this week something had changed. I'm not sure what and when, and not sure whether I changed any configs. So now I have some really weird situation. According to logs name resolving should work normally. /etc/hosts 127.0.0.1 localhost test 127.0.1.1 desktop /etc/host.conf order hosts,bind multi on /etc/resolv.conf # Generated by NetworkManager search search servers obtained via DHCP nameserver 192.168.0.3 /etc/nsswitch.conf passwd: compat group: compat shadow: compat hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis But if fact it is not. user@test ~ping test PING localhost (127.0.0.1) 56(84) bytes of data. [skip] Pinging is ok. user@test ~host test test.myviacube.com has address xx.xxx.161.201 But pure I suspect that NetworkManager might cause this misbehavior, but don't know where to start to check it. Any thoughts, suggestions?

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• pdo_mysql installation

  - by Arsenal

  Hello, On my server I'm trying to instal PHP Projekt (6). This requires pdo_mysql however. I thought this installation of pdo_mysql would be rather straightforward... I tried using pecl (pecl install pdo_mysql) after installing devel etc, but this came up with a permission denied error. I solved this by using directories that were accessible. It then came up with a cant run C compiled programs however. It also says to check config.log for more details but ironically config.log is automatically removed if the installation process fails... When I try to compile and output a "hello world".c however, it works perfectly. I then tried to download the pdo_mysql stuff and install in myself (using configure and make install). This seemed to do the job, but when I restarted my apache ... no sign of pdo_mysql anywhere even though I adjusted my php.ini file I have read somewhere that you need to recompile PHP with the option pdo_mysql enabled. But how does one do that (I'm using CentOS4). And isn't there any other way than that??? Thanks!

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• Screen Resolution only displaying 800x600 in xubunutu

  - by youeee

  I am running Sun Virtual box in a windows 7 64 bit machine. I have installed xubuntu 10.4 as a virtual machine, however I cannot seem to find an easy way of altering the screen resolution. I have looked around at forums however cannot seem to find an answer.

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• Grepping grep output fails

  - by viraptor

  I'm trying to grep the output of ngrep. Unfortunately when I add another grep to the pipeline, I get no output at all. It can be some other command too - cat / grep / tee - everything breaks the chain. Example: # this works: $ ngrep -l -q -T -Wbyline -d any udp and port 5060 | egrep -B1 '^SIP/2.0 180' -- U +1.469535 xxx:5060 -> xxx:5060 SIP/2.0 180 Ringing. -- U +0.001384 xxx:5060 -> xxx:2048 SIP/2.0 180 Ringing. but #these don't: $ ngrep -l -q -T -Wbyline -d any udp and port 5060 | egrep -B1 '^SIP/2.0 180' | egrep '^U' $ ngrep -l -q -T -Wbyline -d any udp and port 5060 | egrep -B1 '^SIP/2.0 180' | cat $ ngrep -l -q -T -Wbyline -d any udp and port 5060 | egrep -B1 '^SIP/2.0 180' | tee test If I use cat somefile instead of ngrep at the start, everything works as expected. Any ideas what could go wrong here?

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• "No route to host" with ssl but not with telnet

  - by Clemens Bergmann

  I have a strange problem with connecting to a https site from one of my servers. When I type: telnet puppet 8140 I am presented with a standard telnet console and can talk to the Server as always: Connected to athena.hidden.tld. Escape character is '^]'. GET / HTTP/1.1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>400 Bad Request</title> </head><body> <h1>Bad Request</h1> <p>Your browser sent a request that this server could not understand.<br /> Reason: You're speaking plain HTTP to an SSL-enabled server port.<br /> Instead use the HTTPS scheme to access this URL, please.<br /> <blockquote>Hint: <a href="https://athena.hidden.tld:8140/"><b>https://athena.hidden.tld:8140/</b></a></blockquote></p> <hr> <address>Apache/2.2.16 (Debian) Server at athena.hidden.tld Port 8140</address> </body></html> Connection closed by foreign host. But when I try to connect to the same host and port with ssl: openssl s_client -connect puppet:8140 It is not working connect: No route to host connect:errno=113 I am confused. At first it sounded like a firewall problem but this could not be, could it? Because this would also prevent the telnet connection. As Firewall I am using ferm on both servers. The systems are debian squeeze vm-boxes. [edit 1] Even when I try to connect directly with the IP address: openssl s_client -connect 198.51.100.1:8140 #address exchanged connect: No route to host connect:errno=113 Bringing down the firewalls on both hosts with service ferm stop is also not helping. But when I do openssl s_client -connect localhost:8140 on the server machine it is connecting fine. [edit 2] if I connect to the IP with telnet it also is not working. telnet 198.51.100.1 8140 Trying 198.51.100.1... telnet: Unable to connect to remote host: No route to host The confusion might come from IPv6. I have IPv6 on all my hosts. It seems that telnet uses IPv6 by default and this works. For example: telnet -6 puppet 8140 works but telnet -4 puppet 8140 does not work. So there seems to be a problem with the IPv4 route. openssl seems to only (or by default) use IPv4 and therefore fails but telnet uses IPv6 and succeeds.

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• cannot resolve DNS server's own domain name

  - by sims

  I have a DNS server (mega.dude - 123.123.123.123) running bind 9.4. When I: dig mega.dude I get no answer section. I have nameserver 123.123.123.123 in /etc/resolv.conf Here is my zone file: $TTL 1W @ IN SOA mega.dude. names.mega.dude. ( 2009081502 ; serial 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum NS ns1 NS ns2 MX 10 mail.mega.dude. A 123.123.123.123 @ A 123.123.123.123 ns1 A 123.123.123.123 ns2 A 123.123.123.123 www CNAME @ mail A 123.123.123.123 It didn't used to look like this. I read that it's evil to have an mx record pointing to a CNAME. So I changed that. Then I thought maybe that was also the case for NS. So I changed those too. Still no good. The ports are open. I can't figure it out. Oh by the way, all the other zones return fine. But not the servers own domain. So I know I'm doing something stupid. Thanks for your help all!

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• How to prevent samba from holding a file lock after a client disconnects?

  - by Jean-Francois Chevrette

  Here I have a Samba server (Debian 5.0) thats is configured to host Windows XP profiles. Clients connects to this server and work on their profiles directly on the samba share (the profile is not copied locally). Every now and then, a client may not shutdown properly and thus Windows does not free the file locks. When looking at the samba locking table, we can see that many files are still locked even though the client is not connected anymore. In our case, this seems to occur with lockfiles created by Mozilla Thunderbird and Firefox. Here's an example of the samba locking table: # smbstatus -L | grep DENY_ALL | head -n5 Pid Uid DenyMode Access R/W Oplock SharePath Name Time -------------------------------------------------------------------------------------------------- 15494 10345 DENY_ALL 0x3019f RDWR EXCLUSIVE+BATCH /home/CORP/user1 app.profile/user1.thunderbird/parent.lock Mon Nov 22 07:12:45 2010 18040 10454 DENY_ALL 0x3019f RDWR EXCLUSIVE+BATCH /home/CORP/user2 app.profile/user2.thunderbird/parent.lock Mon Nov 22 11:20:45 2010 26466 10056 DENY_ALL 0x3019f RDWR EXCLUSIVE+BATCH /home/CORP/user3 app.profile/user3.firefox/parent.lock Mon Nov 22 08:48:23 2010 We can see that the files were opened by Windows and imposed a DENY_ALL lock. Now when a client reconnects to this share and tries to open those files, samba says that they are locked and denies access. Is there any way to work around this situation or am I missing something? Edit: We would like to avoid disabling file locks on the samba server because there are good reasons to have those enabled.

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• How to configure vmware in this situation?

  - by Yousui

  Hi guys, Now I'm using a router to connect my computer to the Internet. I installed VMware Workstation 7 on my computer and installed a guest OS which is CentOS 5.3. Now I want to using putty to connect to the guest OS in my host computer, and I need the guest os can access the Internet too. How can I configure my host's network, guest os and my router? I have little knowledge about network, can you guys give me a step by step direction or something similar? Great thanks!

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• Firefox crash on first load on Ubuntu Linux on Windows Laptop

  - by Ira Baxter

  I've had a Dell Latitude laptop since about 2000 without managing to destroy it. A month ago the Windows 2000 system on it did something stupid to its file system and Windows was completely lost. No point in reinstalling Windows 2000, so I installed an Ubuntu Linux on the laptop. Everything seems normal (installed, rebooted, I can log in, run GnuChess, poke about). ... but ... when I attempt to launch Firefox from the top bar menu icon, I get a bunch of disk activity, the whirling cursor icon goes round a bit and then everything stops: disk, icon, mouse. Literally nothing happens for 5 minutes. Ubuntu is dead, as far as I can tell. A reboot, and I can repeat this reliably. So on the face of it, everything works but Firefox. That seems really strange. The only odd thing about this system when Firefox is booting is that while it has an Ethernet port (that worked fine under Windows), it isn't actually plugged into an Ethernet. As this is the first Firefox boot since the Ubuntu install, maybe Firefox mishandles Internet access? Why would that crash Ubuntu? (I need to go try the obvious experiment of plugging it in).

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• How can I move my partition in GParted?

  - by reprogrammer

  The following is a screenshot of GParted run on my system. There is a small unallocated space at the beginning of the list. This 1 MiB space is kind of annoying and I'd like to merge with any other partition except /dev/sda1, /dev/sda6 and /dev/sda4. When I right click on the unallocated partition, the only available operation is "New". And, if I click on "New", I get the following error message. It is not possible to create more than 4 primary partitions Any ideas of how to go about merging the small unallocated space with other partitions?

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• Clonezilla-SE with another DHCP Server in LAN

  - by aleroot

  I want to install Clonezilla-Server(192.168.1.100) in a network that already have a DHCP Server (dd-wrt with dnsmasq - 192.168.1.1). I've installed Clonezilla-SE on ubuntu Server 10.10, once installed and configured Clonezilla Server i've removed the DHCP-Server and set pxe server address in dnsmasq configuration on DHCP Server : dhcp-boot=pxelinux.0,,192.168.1.100 When i try to start from PXE a Computer in the network clonezilla start, but give me an error that the ipddress of the machine is not given by the clonezilla server and can't continue ... Someone has already tried to configure Clonezilla-SE in a similar enviroment? Is there some configuration on DRBL server of Clonezilla that i need to do ?

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• Sub-process /usr/bin/dpkg returned an error code (1)

  - by rohit

  Hey friends i am getting the following error when i am trying to purge shorewall root@aptosid:/etc# apt-get purge shorewall Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED: shorewall* 0 upgraded, 0 newly installed, 1 to remove and 3 not upgraded. 1 not fully installed or removed. After this operation, 1,843 kB disk space will be freed. Do you want to continue [Y/n]? (Reading database ... 212702 files and directories currently installed.) Removing shorewall ... : not found/shorewall: 25: /etc/default/shorewall: :q Stopping "Shorewall firewall": not done (check /var/log/shorewall-init.log). invoke-rc.d: initscript shorewall, action "stop" failed. dpkg: error processing shorewall (--purge): subprocess installed pre-removal script returned error exit status 1 configured to not write apport reports Errors were encountered while processing: shorewall E: Sub-process /usr/bin/dpkg returned an error code (1) root@aptosid:/etc# please help me out ...........?

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• How to automate kinit process to obtain TGT for Kerberos?

  - by tore-

  I'm currently writing a puppet module to automate the process of joining RHEL servers to an AD domain, with support for Kerberos. Currently I have problems with automatically obtain and cache Kerberos ticket-granting ticket via 'kinit'. If this were to be done manually, I would do this: kinit [email protected] This prompts for the AD user password, hence there is a problem with automate this. How can i automate this? I've found some posts mentioning using kadmin to create a database with the ad users password in it, but I've had no luck. Thanks for input

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• downgrade the system

  - by deddihp

  hello, actually i have some business to downgrade the kernel. I downgrade from kernel 2.6.31-14 (ubuntu 9.10) to 2.6.26.8. And then i got the following error in my boot process : warning: unable to find a suitable fs in /proc/mounts, is it mounted ? use --subdomainfs to override what is that mean anyway ? thanks.

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• Firefox being really sluggish on php.net website?

  - by Rory

  Is it just me, or is firefox (3.5 on Ubuntu 9.10 karmic) really sluggish when opening the PHP.net website? When I have several tabs open with just the PHP.net website, and I tab up and down (with Control-PageUp/Down), it's slow to change tab. If I do it quickly, then firefox freezes for a few seconds (I know because it goes grey, which is a compiz feature to show unresponsive windows). The CPU usage also goes up when I'm tabbing to PHP.net pages. UPDATE: This appears to happen for all PHP.net webpages. For other pages, on other sites, Firefox is fine (for me).

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