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• DNS propagation

  - by Paddington

  I have 1 primary DNS server (ns1.mydomain.com) running on Fedora and 2 secondary ones (ns2 and ns3). DNS changes made on my web servers first goes to the primary name server and then propagates to the secondary servers. After making a DNS change on a domain on the web server, I can't see the new dns information on my ns1 when I perform: dig @ns1 A blahblah.com I then went to the master records on the names server (uses named) in the directory /var/named/run-root/var/named/masters and I see the A record has been updated appropriately. Tailing the logs /var/log/messages is not showing any errors. What could be the issue?

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• Problem with Ubuntu 10.04 and ATI

  - by Maximilinao

  I'm having a problem installing the drivers from the video card. Just finished installing the driver, reboot my OS, and my monitor is starting off in energy saving mode and does not boot Ubuntu. What I can do? Sorry for my English. I used the Google translator.

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• Explanation of command to uppercase the first letter of a file

  - by hazielquake

  Hi I'm trying to learn to rename files with the command line, and after browsing around a lot of pages I finally found a command that uppercases the first letter of a file, but the problem is that I want to understand the meaning of each command. The command is: for i in *; do new=echo "$i" | sed -e 's/^./\U&/'; mv "$i" "$new";done I understand the 'for' kinda... but not the 'echo' or '`' and especially the sed command. if someone has a little patience to explain the meaning of each thing that'd be awesome! Thanks!

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• Rules for setting hostname [duplicate]

  - by Ilia Rostovtsev

  This question already has an answer here: Hostnames - What are they all about? 5 answers Setting the hostname: FQDN or short name? 6 answers It's thought that for the hostname should be used FQDN. I have a doubts about whether using: host.domain.ltd and domain.ltd for the hostname is the same thing and will be equally correct / acceptable? I'm willing to use domain.ltd for the hostname. Is it alright?

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• Formatting pwd/ls for use with scp

  - by eumiro

  I have two terminal windows with bash. One is local on the client computer, another one has an SSH-session on the server. On the server, I am in a directory and seeing a file I would like to copy to my client using scp from the client. On the server I see: user@server:/path$ ls filename filename I can now type scp in the client shell, select and copy the user@server:/path from the server shell and paste to the client shell, then type slash and copy and paste the filename and append a dot to get: user@client:~$ scp user@server:/path/filename . to scp a file from the server to the client. Now I am searching for a command on the server, that would work like this: user@server:/path$ special_ls filename user@server:/path/filename which would give me the complete scp-ready string to copy&paste to the client shell. Something in the form echo $USER@$HOSTNAME:${pwd}/$filename working with relative/absolute paths. Is there any such command/switch combination or do I have to hack it myself? Thank you very much.

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• Gnome, open with, custom command, filename reference

  - by Tergiver

  I want to execute this custom command on a file from the Gnome File Browser: hexdump -C $f > $f.dump That would create a hexdump of the file with the file's name + .dump in the directory that the file exists in. When I say $f above I mean something that would substitute the name of the file that was opened. So I've tried "Open with", "Use a custom command". I can't get it to work. I've tried a number of symbols in place of $f. Is it even possible? Before you suggest getting a GUI hexdump program, this is just one example. I have the need to do this sort of thing for many terminal-type programs. Am I the only person on Earth who wishes for a hybrid File-Browser-slash-Command-Terminal? That would be a file browser which contained a terminal pane who's current directory always matched that of the file browser. One could execute shell commands in the context of what they were viewing in the browser.

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• How to know my wireless card has injection enabled?

  - by shrimpy

  I am playing around with aircrack. And was trying to see whether my wireless card on my laptop can pass the injection test And I end up seeing the following... does it mean my wireless card is not able to run aircrack? root@myubuntu:/home/myubuntu# iwconfig lo no wireless extensions. eth0 no wireless extensions. eth1 IEEE 802.11bg ESSID:"" Nickname:"" Mode:Managed Frequency:2.437 GHz Access Point: Not-Associated Bit Rate:54 Mb/s Tx-Power:24 dBm Retry min limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=5/5 Signal level=0 dBm Noise level=-57 dBm Rx invalid nwid:0 Rx invalid crypt:781 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 root@myubuntu:/home/myubuntu# aireplay-ng -9 eth1 ioctl(SIOCSIWMODE) failed: Invalid argument ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211, ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make sure RFMON is enabled: run 'airmon-ng start eth1 <#>' Sysfs injection support was not found either. root@myubuntu:/home/myubuntu#

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• VirtualBox error with Ubuntu virtual machine

  - by user2985363

  I am trying to work on a coding project and cannot open my Ubuntu virtual machine with Oracle VM VirtualBox. I took a snapshot yesterday at about 11, and it was working fine. Several times I closed and reopened it. Today when I tried to open it, I kept getting the error below. Failed to open a session for the virtual machine Ubuntu 12.04 32-bit. VM cannot start because the saved state file 'C:\Users\Tyler\VirtualBox VMs\Ubuntu 12.04 32-bit\Snapshots\2014-01-30T19-59-05-976647800Z.sav' is invalid (VERR_FILE_NOT_FOUND). Deleted the saved state prior to starting the VM. I tried deleting the file as it said, but none of the snapshots would open still. The file is still in my recycling bin. What can I do? Also, I took the 1/31 snapshot today before I deleted the previous one.

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• My server keeps sending emails to [email protected]

  - by xtrimsky

  When I type mailq on my server, I get: BB523653A62 4025 Wed Jun 4 10:40:07 MAILER-DAEMON (delivery temporarily suspended: host p3smtpout.secureserver.net[208.109.80.54] refused to talk to me: 554 p3plsmtpout002.prod.phx3.secureserver.net : DED : AJeb1o0334uf1Y801 : DED : You've reached your daily relay quota - IP.ADDRESS) [email protected] B33AD653A4A 4025 Wed Jun 4 08:20:07 MAILER-DAEMON (delivery temporarily suspended: host p3smtpout.secureserver.net[208.109.80.54] refused to talk to me: 554 p3plsmtpout002.prod.phx3.secureserver.net : DED : AJeb1o0334uf1Y801 : DED : You've reached your daily relay quota - IP.ADDRESS) [email protected] B77DF653A63 4025 Wed Jun 4 10:50:07 MAILER-DAEMON (delivery temporarily suspended: host p3smtpout.secureserver.net[208.109.80.54] refused to talk to me: 554 p3plsmtpout001.prod.phx3.secureserver.net : DED : AJvF1o00L4uf1Y801 : DED : You've reached your daily relay quota - IP.ADDRESS) [email protected] B943C653A3C 4025 Wed Jun 4 06:40:07 MAILER-DAEMON (delivery temporarily suspended: host p3smtpout.secureserver.net[208.109.80.54] refused to talk to me: 554 p3plsmtpout001.prod.phx3.secureserver.net : DED : AKBv1o00P4uf1Y801 : DED : You've reached your daily relay quota - IP.ADDRESS) [email protected] (there is probably about 50 of these, and I've cleared the queue today), do you know where these could be coming from ? is it my server sending some logs to "hostmaster" ? I've replaced my actual domain, with "MYDOMAIN". How can I find what could be sending these emails ? The server has recently been hacked so I'm also a bit worried. Thanks!

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• In Bash, how can I obtain the directory path from the previous command's last argument

  - by Beaming Mel-Bin

  I frequently have to do this. For example: $ vim /etc/pam.d/sudo $ vim /etc/pam.d/sudo-i $ cd /etc/pam.d/ # Figure I should just go to the directory Now, is there a way I could obtain the directory of the last argument when it's a file path? I'm asking this cause I recently became aware of the $_ variable that has become useful. Was wondering if there's some other commandline fu that might come in handy.

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• Server not resolving after restart

  - by DomainSoil

  I restarted our server today, and now cannot for the life of me get anything to resolve... I suspect it has something to do with our routes. I've tried numerous Google results to no avail. Here is as far as I've gotten: [root@www ~]# route -n Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.101 0.0.0.0 255.255.255.255 UH 0 0 0 eth1 0.0.0.0 192.168.1.101 0.0.0.0 UG 0 0 0 eth1 Things you need to know: Our server (CentOS 6.3) runs two virtual machines, one live, and one development. They mirror each other as much as possible, but I can't find where I've went wrong with the live server. The dev server works fine. [root@www ~]# ifconfig eth1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx inet6 addr: xxxx:xxx:xxxx:xxxx:xxxx/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:118206 errors:0 dropped:0 overruns:0 frame:0 TX packets:165 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:7825749 (7.4 Mib) TX bytes:7146 (69.2 KiB) Interrupt:28 [root@www ~]# /etc/init.d/network status Configured devices: lo Auto eth0 Currently active devices: lo eth1 If there is any other information you need, please don't hesitate to ask!

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• Why does deleting from the command line take significantly less time than from a GUI?

  - by Jordan Plahn

  So this is probably the dumbest question you'll read today, but it's something I just wondered about as I was deleting a dozen or so images from my computer. With a quick rm -rf command on the directory's contents, all the images were gone in a snap. When I drag the same dozen or so images to a trash can/recycle ban, it takes sometimes 10 seconds or more. Now I'm sure some of it comes from the overhead of the GUI and such, and some of it may be the fact that the file still "exists" in some form if it's put into the recycle bin, but is there anything else that accounts for such a huge time disparity? Are "rm" and "delete" just such fundamentally different commands so I'm trying to compare apples and oranges? Enlighten me, please!

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• nagios ldap-group based front end login permission issues

  - by Eleven-Two

  I want to grant users access to the nagios 3 core frontend by using an active directory group ("NagiosWebfrontend" in the code below). The login works fine like this: AuthType Basic AuthName "Nagios Access" AuthBasicProvider ldap AuthzLDAPAuthoritative on AuthLDAPURL "ldap://ip-address:389/OU=user-ou,DC=domain,DC=tld?sAMAccountName?sub?(objectClass=*)" AuthLDAPBindDN CN=LDAP-USER,OU=some-ou,DC=domain,DC=tld AuthLDAPBindPassword the_pass Require ldap-group CN=NagiosWebfrontend,OU=some-ou,DC=domain,DC=tld Unfortunately, every nagios page just shows "It appears as though you do not have permission to view information for any of the services you requested...". I got the hint, that I am missing a contact in nagios configuration which is equal to my login, but creating one with the same name as the domain user had no effect on this issue. However, it would be great to find a solution without manually editing nagios.conf for every new user, so the admins could grant access to nagios by just putting the user to "NagiosWebfrontend" group. What would be the best way to solve it?

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• yum update with shared cache

  - by Sammitch

  We've got a big batch of RHEL6 machines that are due for patching, and for some reason the process here does not involve a local repo. I'm new here, I've asked why, ["it just didn't work"] and I don't have enough time to make it work before the window that's already scheduled. So the usual method is to install yum-downloadonly and run yum update --downloadonly --downloaddir=/mnt/cifs_share and then yum update /mnt/cifs_share/*.rpm which just does not look right to me since not all of these machines have the same set of installed packages. The method I tried today was mounting the share to /var/cache/yum/x86_64/6Server/rhel-x86_64-server-6/packages/ which worked, but then yum automatically deleted everything once it finished. I've looked over the yum man page, but I don't see any flag I can feed it to stop it from deleting everything, nor a flag like up2date's --tmpdir=/mnt/cifs_share. Can anyone out there help me kludge this together until I can get a local repository working?

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• Locale misconfig. Debian

  - by JakeTheFish

  perl -e 'print "Hello\n";' perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LC_CTYPE = "UTF-8", LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Hello I'v tried to do export LC_ALL=en_US.UTF-8 export LANGUAGE=en_US.UTF-8 And it workis, till I log out. Is there any permanent solution?

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• How to open port 25 on the server

  - by liuxingruo

  I'm using centOS. I want to implement a smtp mail server, and I have installed postfix and dovecot(both have been set correctly). I tried to telnet the 25 port, but it returns Unable to connect to remote host: Connection refused So, How can I open the 25 port? Thanks!

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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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• 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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• [ Ubuntu ] How to know the corresponding command line cmd for the UI click?

  - by smwikipedia

  I can click the "movie player" from the GUI of Ubuntu, but how could I know the corresponding command line cmd. I want to run the movie player from commmand line. Many thanks.

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• vim: remove previous code indentation and convert to another

  - by ramgorur

  I have a c project with multiple files (more than 100), the codes are written in Whitesmiths style, but I want to change them into K&R style indentation. Is it possible to do using vim in an automated way ? For example I have a emacs-lisp script to achieve this -- (progn (find-file "{}") (mark-whole-buffer) (setq indent-tabs-mode nil) (untabify (point-min) (point-max)) (indent-region (point-min) (point-max) nil) (save-buffer)) I was wondering if there is a similar trick that could be done with vim.

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• Full Apache config migration

  - by Victor Rashkov

  I searched alot and didn't find an applicable answer. I have a working LAMP setup on Ubuntu machine and I have to migrate to a new server in a different country. The old server is 11.10, the new server is 12.04LTS. My problem is that I simply can not remember the steps I followed when I configured the current server which is not the basic LAMP install. It is Apache with FastCGI, SuEXEC, a GD library, worker MPM and all sitting on top of a mhddfs system. There are also other configs I've changed and I can not recall what they are. Because of the complexity of the setup, my attempts to migrate to the new server fail. I get permissions errors, cgi problems etc. Therefore my question is : Is there a sane way to simply tar a full backup of the current web server installation, including MySQL, Php amd the apache server with all configs, and then move it to the new machine? I shall be forever thankful on any advise. So far non of thise I found here gave me an answer. Thanks!

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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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• Tuning MySQL to consume less memory

  - by Alex

  I have a VM which has 2GB Ram, (full specs) And I am setting up a site which has one table in particular with over a million records. There's little or no usage of this particular database (perhaps once or twice a day) but simply running mysql grinds the whole server to a halt. I've looked through the top results but nothing is really denting the CPU however the memory seems to be the issue. The site isnt even live of taking requests yet. the memory situation looks like this: # free -m total used free shared buffers cached Mem: 2006 1880 126 0 3 53 -/+ buffers/cache: 1823 183 Swap: 2047 345 1702 Are there any good pointers to tune mysql to stop hogging the system memory? Thanks very much EDIT: (requested by 8bit): http://tny.cz/b41a0b12

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• How do I make sure that BOTH my server and MYSQL have the same timezone?

  - by Alex

  Because when I create a time in Python scripts..I want it to match MYSQL's time. How do I make BOTH of them pacific time?

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• Router that allows custom Dynamic DNS server [closed]

  - by Thuy

  I've made my own DDNS service and it works fine using an application running on clients to update the IP. But if for some reason I don't have the choice of using my software and instead I need to use a router to update the IP, it becomes troublesome. For example, I needed to setup IPsec from a customer to me and the customers router/firewall (netgear srx5308) has a dynamic IP which is given from the ISP which can't offer static IPs. So it needs to use dynamic dns for it to work. In this case there really isn't a client to run the software on since it's a router/firewall. Unfortunately it seems that most routers are rather unfriendly towards custom DDNS solutions and most offer only dyndns.com or similar templates. Which was the case with this router too. Leaving me with no way to use my own dynamic dns server IP. I have the option of switching out the customers router and I've been looking around for alternatives and other routers/solutions and I was wondering if anyone on this great site might have been in a similar situation or might just know about some router/firewall that is more friendly towards custom ddns solutions that I might be able to use. Thanks in advance for any help or guidance!

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