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• Wireless performance on Ubuntu 9.10

  - by Brian

  Is there something I should do to my networking configuration in Ubuntu to better the performance of my wireless connection? I'm on a netbook dual-booting Windows 7 and Ubuntu 9.10. I pick up much stronger wifi signal when in Windows than Ubuntu. As soon as I boot Ubuntu, it will connect to the network with a stronger signal, and then loses signal very quickly. After it dies, I can't reconnect. I've tested this on a couple of different networks with the same outcome.

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• How to write rules for persistent net names?

  - by ndemou

  I know that a process generates persistent network card names based on rules found in /lib/udev/rules.d/75-persistent-net-generator.rules. I also know how to completely disable this process with a simple echo '#' > /etc/udev/rules.d/75-persistent-net-generator.rules but I've read that I "could also write my own rules file to give the interface a name — the persistent rules generator ignores the interface if a name has already been set" (/etc/udev/rules.d/README confirms that this is possible). Do you have any pointers to documentation about how to write such rules? (I mostly care about Debian/Ubuntu and a bit less for CentOS) As a specific example of why I want to write custom rules: I have two identical servers with one onboard LAN and one PCI LAN. In case of HW failure I want to be able to move disks from HW#1 to HW#2 and it's important for eth0 to continue pointing to the onboard card and eth1 to the PCI card (no one wants to mess with cabling in the middle of a HW failure panic). My current workaround works but is a lot of work[1] so I wonder if writing custom rules would allow me to express something simple like this: cards with MAC A or B should be named eth0 cards with MAC C or D should be named eth1 follow default naming scheme for anything else [1] install the OS in HW#1 and keep a copy of /etc/udev/rules.d/70-persistent-net.rules. Move the disks to HW#2 and keep a second copy of the same file. Concatenate the two copies and manually edit the NAME="ethX" part. Replace /etc/udev/rules.d/70-persistent-net.rules with my version. Finally disable auto-creation of a new 70-persistent-net.rules using echo '#' > /etc/udev/rules.d/75-persistent-net-generator.rules

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• What can inexperienced admin expect after server setup completed seemingly fine? [closed]

  - by Miloshio

  Inexperienced person seems to have done everything fine so far. This is his very first time that he is the only one in charge for LAMP server. He has installed OS, network, Apache, PHP, MySQL, Proftpd, MTA & MDA software, configured VirtualHosts properly (facts because he calls himself admin), done user management and various configuration settings with respect to security recommendations and... everything is fine for now... For now. If you were directing horror movie for server admin above mentioned what would you make up for boogieman that showed up and started to pursue him? Omitting hardware disaster cases for which one cannot do anything 'from remote', what is the most common causes of server or part-of-server or server-related significant failure when managed by inexperienced admin? I have in mind something that is newbie admins very often missing which is leading to later intervention of someone with experience? May that be some uncontrolled CPU-eating leftover process, memory-related glitch, widely-used feature that messes up something unexpected on anything like that? Newbie admin for now only monitors disk-space and RAM usage, and number of running processes. He would appreciate any tips regarding what's probably going to happen to his server over time.

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• How do i install apache on my ubuntu 12.04 where it has virtualhost

  - by YumYumYum

  According to the docs https://help.ubuntu.com/10.04/serverguide/httpd.html i have done following, and that is almost how i do always in my Fedora, but Ubuntu looks like its not working. a) DNS to IP $ echo "127.0.0.1 a" > /etc/hosts $ echo "127.0.0.1 b" > /etc/hosts b) Apache virtualhost $ ls 1 2 default default.backup default-ssl $ cat 1 <VirtualHost *:80> ServerName a ServerAlias a DocumentRoot /var/www/html/a/public <Directory /var/www/html/a/public> #AddDefaultCharset utf-8 DirectoryIndex index.php AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost> $ cat 2 <VirtualHost *:80> ServerName b ServerAlias b DocumentRoot /var/www/html/b/public <Directory /var/www/html/b/public> #AddDefaultCharset utf-8 DirectoryIndex index.php AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost> c) load into Apache and restart the service $ a2ensite 1 $ a2ensite 2 $ a2dissite default $ /etc/init.d/apache2 restart d) Browse the new 2 hosts $ firefox http://a Does not work it goes always with http://a or http://b to /var/www/html How do i fix it so that it goes to its own directory e.g: http://a goes to /var/www/html/a/public not /var/www/html?

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• How do I get rid of sockets in FIN_WAIT1 state?

  - by Gert M

  I have a port that is blocked by a process I needed to kill. (a little telnet daemon that crashed) The process was killed successfully but the port is still in a 'FIN_WAIT1' state. It doesn't come out of it, the timeout for that seems to be set to 'a decade'. The only way I've found to free the port is to reboot the entire machine, which is ofcourse something I do not want to do. $ netstat -tulnap | grep FIN_WAIT1 tcp 0 13937 10.0.0.153:4000 10.0.2.46:2572 FIN_WAIT1 - Does anyone know how I can get this port unblocked without rebooting?

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• Basic connectivity issues between Win 7 and XP mixed wired/wireless network. [Solved]

  - by Pulse

  Setup: Windows 7 x64 Ultimate desktop hard wired to Asus WL500gp router (WL500gpv2-1.9.2.7-d-r1445 firmware) Several Bridged VirtualBox VM's running XP, 7, ubuntu server 10.04, Mint 9 and SuSE 11.2 Win XP Pro SP3 notebook with D-Link Airplus wireless network card. No firewall or other security software currently running on either platform (at least for the duration of the test) Situation: Router is acting DHCP server Clients are receiving correct addresses and additional parameters Internet connectivity is available from all clients Windows 7 sharing is set to Network type = work (not home group) NetBT is disabled on all clients using smb over TCP What I can do: I can ping the router and internet addresses from the wireless XP notebook I can ping the Win 7 desktop and any VM from the XP wireless notebook I can ping all devices from the router All VM's and 7 can ping each other and the router as well as Internet addresses What I can't do: I cannot ping the XP wireless notebook from either the Win 7 desktop or the VM's; it always returns a destination host unreachable error. Tracert resolves the name or the XP notebook but also returns a destination host unreachable. From the above it would seem that something is blocking connectivity in a single direction (from the Win 7 box to the Win XP notebook) only but the router can ping the XP notebook. Some fresh input would be most welcome, as this is beginning to drive me batty. Thanks

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• How do I host multiple domains on Ubuntu Server (Hardy Heron)?

  - by markle976

  I am trying to figure out the best way to host multiple domains on my Ubuntu server. I have tried multiple options, but I can't get everything to work the way I want it to. I want to be able to add domains without having to restart Apache each time. I tried using mod_vhost_alias (see below), but that maps www.domain.com and domain.com to different folders. I also need to be able to use mod_rewite to map requests for domain.com/app/* to domain.com/somescript.php current httpd.conf: UseCanonicalName Off VirtualDocumentRoot /var/www/%0 Any thoughts?

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• sudoer scheme to allow useful access to another web developer yet retain future control of a virtual

  - by Tchalvak

  Background: Virtual Private Server I have a virtual private server that I'm looking to host multiple websites on, and provide access to another web developer. I don't care about putting too many constraints on him, though I wouldn't mind isolating the site that he'll be developing from other sites on the server that I will develop. The problem: retain control Mainly what I want is to make sure that I retain control over the server in the future. I want to reserve the ability to create/promote/demote and other administrative functions that don't deal with web software. If I make him an admin, he can sudo su - and become root and remove root control from me, for example. I need him not to be able to: take away other admin permissions change the root password have control over other security/administrative functions I would like him to still be able to: install software (through apt-get) restart apache access mysql configure mysql/apache reboot edit web development configuration type files in /etc/ Other Standard Setups would be happily considered I've never really set up a good sudoers file, so simple example setups would be very useful, even if they're only somewhat similar to the settings that I'm hoping for above. Edit: I have not yet finalized permissions, so standard, useful sudo setups are certainly an option, the lists above are more what I'm hoping I can do, I don't know that that setup can be done. I'm sure that people have solved this type of problem before somehow, though, and I'd like to go with something somewhat tested as opposed to something I've homegrown.

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• I'm trying to set up a LAMP server so it's totally anonymous, any suggestions?

  - by flexterra

  I'm going to set up a web service which will use the LAMP stack. One of the most important features of the site is that it should be anonymous. We thought that a cool thing will be if the server didn't made any logs that could potentially identify a user. I'm working on a web app for a news organization. They want a site to allow people to sumbit news leads and tips (text / files) to journalists. We think if we can provide good anonymity people will be more inclined to provide information. We will also teach how to use stuff like TOR as an extra precaution for whistleblowers Is this even possible? Any suggestions of obscure things we should look into?

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• rsync without password, none of google (server fault) tutorials worked

  - by Jake Armstrong

  I need to use rsync for a daily backup operation and in the past (on different servers) I managed to just use a rsa key etc, but now none of google (serverfault) tutorials work at all. It keeps asking me for a password. I have webmin and ssh/root access to both servers. My steps: create a key on server 1 send key.pub to server 2 add key.pub to .ssh/authorized_keys chmod 700 .ssh/authorized_keys go back to server 1 and try rsync and it keep asking for password... rsync command: rsync -avz -e ssh file.txt root@server2:/root EDIT: well, I cleaned up everything and this time, instead of inserting a custom name to the key I used the standard one on server1. sent the .pub to server2 and it worked as a charm... So the answer is that server1's ssh wasn't even using the right key...

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• How to make a non-root user to use chown for any user group files?

  - by user1877716

  I would like to make a user super powerful, with almost all root rights but unable to touch a the root user (to change the password of the root). My goal is to user "B" to manage my web server. The problem is user B need to able to run the chown and chmod commands on some files belonging to other users. I tried to put B in root group or use visudo, but it's not enough. I'm working an Centos 6 system. If some body have ideas!

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• VMware - Broadcom 1000Gbps NIC does not link at 100Mbps to a Cisco switch port

  - by Spirit

  Today we've stumbled on a very awkward situation with our VMWare Server. The server is with ESX 3.5 that has a 1Gbps NIC. We bought a brand new managed Cisco Linksys switch with 10/100Mbps interface ports but when we plugged the cable in one of the ports the link simply does not wanted to activate :S... Does anyone with more VMware experience have ever had similar problem? From what I know is that 1Gbps NICs are backwards compatible with 100Mbps switches. This is what we've tryed so far but with no success: Tryed: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004089 Tryed to modify the /etc/modules.conf folowing the guide from this article http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=813 After the changes I have restarted the networking services using # service network restart, # service mgmt-vmware restart and # service vmware-vpxa restart It seems that no matter how many times, or whatever approach/method (GUI or Shell) we try to change the speed and duplex of the network adapter and to force it to 100mbps it only accepts 1Gbps .. I am starting to go nuts :@

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• Creating own Amazon Machine Image - Kernel panic

  - by amra

  I have created own AMI and registered it on Amazon EC2. But while AMI startup I receive following error: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1) The image is running locally without any problems. fstab contains: proc /proc proc defaults 0 0 /dev/sda1 / ext3 relatime,errors=remount-ro 0 1 thx for help

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• How to configure sendmail to relay through a specific server

  - by ErebusBat

  I have a tiny home server setup behind my cable modem (bresnan communications). I want to be able for this box to send out email (not receive) for notifications and whatnot. What I have already done: I have installed and configured sendmail. I have added mail.bresnan.net as my SMART_HOST directive. What I belive the problem is When I attempt to send an email I get the following in my mail log: Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: from=aburns, size=140, class=0, nrcpts=1, msgid=<[email protected]>, relay=aburns@localhost Dec 22 10:24:17 batcave sm-mta[1531]: oBMHOHWZ001531: from=<[email protected]>, size=397, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1] Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: to=<[email protected]>, ctladdr=aburns (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30140, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (oBMHOHWZ001531 Message accepted for delivery) Dec 22 10:24:18 batcave sm-mta[1517]: oBMH9mVv001357: to=<[email protected]>, ctladdr=<[email protected]> (1000/1000), delay=00:14:30, xdelay=00:00:42, mailer=relay, pri=300339, relay=pmx0.bresnan.net. [69.145.248.1], dsn=4.0.0, stat=Deferred: Connection timed out with pmx0.bresnan.net. You can see where the message is accepted for delivery by my sendmail server, then where it attempts to hand off to bresnan's server and it timesout. This is where my question is. Asstute readers will notice that pmx0.bresnan.net is not what I have my SMART_HOST directive set as. This is the (outside?) MX server for the bresnan.com/net domain. Apparently bresnan has their network configured so that you can not access this server from within their own network and instead must use the mail.bresnan.net server (which I can connect to). The problem is that I don't know how to tell sendmail to use this server and not the domain. What I have tried Setting a hosts entry so that the pmx0 server points to the mail IP address. This doesn't work, which makes sense as sendmail is obviously doing an MX query to find the server which returns the IP so there is never a need to do a 'normal' DNS resolve so the hosts file never gets involved.

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• Sending a file to uCLinux

  - by Mike

  I have a board running uClinux, and I need to send a file to it, but I'm not sure how... I have a RS232 port, and Ethernet port with an IP address at my disposal, I can telnet to the board, but uCLinux doesn't have a built in FTP client. What sort of options do I have here for transferring files from my Windows 7 (or OpenSUSE) machine(s) to this board? EDIT I just found I have a TFTP server on it: # tftp BusyBox v0.60.5 (2012.07.09-14:05+0000) multi-call binary Usage: tftp [OPTION]... HOST [PORT] But I can't find any good information on how to use TFTP. And looking around google I'm seeing it's good for loading binary images, so I'm assume anything could be sent, but I'm not sure.

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• Can't mount hard drive. Ubuntu 12.04

  - by Sam

  I am trying to recover some pictures on my 320 GB Hard Disk, so I put in a Live Ubuntu CD and am in that right now. In the devices list, it shows my USB drive, but not my 320 GB Hard Disk. I can see the disk in Disk Utility (it says it's on /dev/sda), but it's not mounted, and it says it has a few bad sectors but it is OK. In Disk Usage Analyzer, it says my maximum capacity is 13.4 GB, so it's definitely not using the 320 GB Hard Disk. I tried the following: sudo mkdir /media/newhd (worked) sudo mount /dev/sda /media/newhd (didn't work. it says I must specify the filesystem type) I then tried: fsck.ext4 -f /dev/sda (didn't work. Said: Superblock invalid, trying to backup blocks. then: Bad magic number in super-block while trying to open /dev/sda. The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock) Does anyone have any ideas? The whole problem started when my Windows Vista said "Can't find operating system". Any ideas on how I can get on to my hard drive at /dev/sda?

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• Tracing out going connections

  - by Tiffany Walker

  Jan 24 07:00:49 HOST kernel: [875997.380464] Firewall: *TCP_OUT Blocked* IN= OUT=eth0 SRC=108.60.11.15 DST=74.80.225.32 LEN=52 TOS=0x00 PREC=0x00 TTL=64 ID=18789 DF PROTO=TCP SPT=64823 DPT=81 WINDOW=14600 RES=0x00 SYN URGP=0 Jan 24 07:00:50 HOST kernel: [875998.378321] Firewall: *TCP_OUT Blocked* IN= OUT=eth0 SRC=108.60.11.15 DST=74.80.225.32 LEN=52 TOS=0x00 PREC=0x00 TTL=64 ID=18790 DF PROTO=TCP SPT=64823 DPT=81 WINDOW=14600 RES=0x00 SYN URGP=0 I run fcgid so everything runs as a user. But is there a way to trace and figure out who is running an out going script? The sites all share the same IP so it's hard to know which site it is or where the script is located at.

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• Linus Torvalds qualifie le disque dur de "Satan", le père du noyau Linux critique la latence du support de stockage

  Linus Torvalds qualifie le disque dur de « Satan » le père du noyau Linux critique la latence du support de stockage et opte pour les mémoires Flash Linus Torvalds n'a pas la langue dans sa poche. Le créateur du noyau Linux vient une fois de plus de faire l'une de ses déclarations qui lui sont caractéristiques, lors d'un entretien avec les amateurs de technologie du blog Slashdot. Après avoir qualifié les développeurs du système d'exploitation OpenSuse de « crétin » et plus récemment le fabricant Nvidia de « pire société ayant travaillé avec la fondation Linux », Torvalds a déversé son courroux sur les disques dur...

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• NFS host is not exporting the "share"

  - by user1345260

  I have a NFS Server: usanfsd01 And a remote machine: usafssd01 I tried mounting a directory from usafssd01 onto usanfsd01 by adding the following line to /etc/fstab as root usanfsdo1:/home/dblogs /home/data/dblogs nfs rw 0 0 And when I run the following command to see if NFS is exporting the share, it's not shown showmount -e usanfsdo1 Can someone please help? Also, a point of interest would be there is another mount that works on the same servers and thats defined as below in the /etc/fstab usanfsdo1:/home/files /home/data/files nfs rw 0 0 /etc/exports /nfs/home/dblogs 'IPADDRESS'(rw,no_root_squash)

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• NAT via iptables and virtual interface

  - by Alex

  I'm trying to implement the following scenario: One VM-host, multiple guest VMs, each one gets its own IP-address (and domain). Our server has only one physical interface, so the intended use is to add virtual interfaces on eth0. To complicate our situation the provider uses port-security on their switches, so I can't run the guest interfaces in bridged mode, because then the switch detects a "spoofed" MAC-address and kills the interface (permanently, forcing me to call the support, which I'm sure will get them a little bit angry the third time ;) ). My first guess was to use iptables and NAT to forward all packages from one virtual interface to another one, but iptables doesn't seem to like virtual interfaces (at least I can't get it to work properly). So my second guess is to use the source IP of the packages to the public interface. Let's assume libvirt creates a virbr0-network with 192.168.100.0/24 and the guest uses 192.168.100.2 as IP-address. This is what I tried to use: iptables -t nat -I PREROUTING --src public_ip_on_eth0:0 -p tcp --dport 80 -j DNAT --to-destination 192.168.100.2:80 That doesn't give me the intended results either (accessing the server times out). Is there a way to do what I'm trying to do, or even to route all traffic to a certain IP on a virtual interface to the VM's device?

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• File permissions to run mysqld in chroot

  - by Neo

  I'm trying to run mysqld inside chroot environment. Herez the situation. When I run mysqld as root, I can connect to my databases. But when I run mysql using init.d scripts, mysql gives me an error. $ mysql --user=root --password=password ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) So I guess, I need to change file permissions of some files. But which ones? Oh and in case you are wondering '/var/run/mysqld/mysqld.sock' is owned by 'mysql' user. EDIT: strace output looks something like this [pid 20599] <... select resumed> ) = 0 (Timeout) [pid 20599] time (NULL) = 12982215237 [pid 20599] select(0, NULL, NULL, NULL, {1, 0} <unfinished ...>

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• Error when sending mail to an external mail server from Postfix on CentOS

  - by yankitwizzy

  I just installed Postfix. i have not yet done any configuration on it. Each time I try to use it to sendmail from another application, it keeps telling me that COnnection was refused from the ip I want to connect to. This is the error I get [root@localhost /]# telnet mail.abuse.org Trying 69.43.160.153... telnet: connect to address 69.43.160.153: Connection refused telnet: Unable to connect to remote host: Connection refused COuld someone please help me the problem

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• Ubuntu 64-bit vs 32-bit

  - by tukushan

  Is it worth installing the Ubuntu 9.10 64-bit version over the 32-bit x86 version? I will get the ability to address more than 4 GB of memory, but other than that, how does the 64-bit version fare in terms of performance and stability?

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• Failed dependency while installing browser Iron(A google chrome clone)

  - by Krishnadas PC

  Installation failed while trying to install Iron browser. [root@localhost softwares]# rpm -ivh iron64.rpm error: Failed dependencies: libc.so.6(GLIBC_2.15)(64bit) is needed by iron64-29.0.1600-2.x86_64 libudev.so.1()(64bit) is needed by iron64-29.0.1600-2.x86_64 libudev.so.1(LIBUDEV_183)(64bit) is needed by iron64-29.0.1600-2.x86_64 and when tried to install using yum it failed also.

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• Any good resources on setting up an ubuntu virtual machine for web development?

  - by Relequestual

  I'm currently on my placement year at uni with 4 months left. Before working at my current place, I have not used a nix environment for web development and have used WAMP. Over the past year I have found some very interesting new tech that requires a bit more than my shared hosting even to play with (eg node.js, RoR 3). At work we use a Virtual Machine for development, but that's all been set up and configured to match the live servers, and is managed with a Puppet server. Are there any really good resources for setting up and configuring an Ubuntu VM as a web server? Work currently uses Ubuntu so I would assume this is a good OS to use. I do of course know how to use google, but the noise ratio is just too big, so thought I'd ask here, as I know many of you will have a ton of bookmarks. Cheers.

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