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  • Migrating users and mailboxes from postfix / Maildir to Postfix with Mysql backend [closed]

    - by Chrispy
    Possible Duplicate: Migrating users and mailboxes from postfix / Maildir to Postfix with Mysql backend So I've got 60 or so users on a hand rolled postfix installation on openbsd and I'd like to move their mailboxes to our new mail server running iRedMail (postfix, vmail/mysql back end) Does anyone know of a good way to do this? Preferably a script I can run to keep syncing the users mailboxes as MX records get updated? I presume one way (though I don't have all their passwords!) would be to have a command line imap client that simulated the users copying their mail themselves but I'm sure there must be a shell / php script to migrate users? Anyone got any bright ideas? Chris.

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  • Dealing with SMTP invalid command attack

    - by mark
    One of our semi-busy mail servers (sendmail) has had a lot of inbound connections over the past few days from hosts that are issuing garbage commands. In the past two days: incoming smtp connections with invalid commands from 39,000 unique IPs the IPs come from various ranges all over the world, not just a few networks that I can block the mail server serves users throughout north america, so I can't just block connections from unknown IPs sample bad commands: http://pastebin.com/4QUsaTXT I am not sure what someone is trying to accomplish with this attack, besides annoy me. any ideas what this is about, or how to effectively deal with it?

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  • Input traffic shaping

    - by whitequark
    I know that I can shape output traffic with tc or a similar tool. However, I want to shape the input traffic now—actually, I want to prioritize downloading of files of certain type through a slow lossy connection. I know the reason tc can only shape output traffic: the host itself has no direct control over the amount of input traffic. On the other hand, TCP has some measures built in it which prevent the TCP traffic from overflowing a slow connection. So, can I mangle something in TCP header so that the remote host will think my connection is slower than it thinks? Suppose that I am able to set the corresponding mark on both types of connections with iptables. Is there any way to reduce the input bandwidth of connections of first type, but only if connections of second type are present?

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  • Timeout ssh sessions after inactivity?

    - by Insyte
    PCI requirement 8.5.15 states: "If a session has been idle for more than 15 minutes, require the user to re-enter the password to re-activate the terminal." The first, and most obvious, way to deal with ssh sessions that are idling at the bash prompt is by enforcing a read-only, global $TMOUT of 900. Unfortunately, that only covers sessions sitting at the bash prompt. The spirit of the PCI spec would also require killing sessions running top/vim/etc. I've considered writing a */1 cron job that parses the output of "/usr/bin/w" and kills the associated shell, but that seems like a blunt instrument. Any ideas for something that would actually do what the spec requires and just lock the terminal? I've looked at away and vlock; they both seem great for voluntarily locking your terminal, but I need a cron/daemon task that will enforce locking.

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  • Tar dereference only 1 level

    - by Bart van Heukelom
    I use the following pseudo-script to create a TAR of my installed software mkdir tmp ln -s /path/to/app1/bin tmp/app1 ln -s /and/path/going/to/the-app-2 tmp/app2 tar -c --dereference -f apps.tar tmp I need the --dereference option here to follow the links I just made in tmp. The reason I make the links in the first place is to store the directories with a different name in the archive than they have on the filesystem. Until now it has worked fine. However, I now have the situation that /path/to/app1 also contains links, and those I don't want to follow. Is this possible with some changes to the tar command? Or do I need to completely switch around the way I build the archive?

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  • Fastest reliable way to open the terminal?

    - by meder
    I actually had my SUPER_L ( left windows key ) binded to gnome-terminal, but for whatever reason ever since upgrading to 9.04 Ubuntu from 8.10 Intrepid it seemed to break the key binding. It was very handy because I could throw open the terminal with one key ( sorry but alt-f2 and typing gnome-terminal isn't practical for me ). Or perhaps it reset all the keybindings? I remember using xev and some gui type interface that was akin to Win32 registry editor. Anyway, I'm curious as to what you guys use to open the terminal.

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  • ubuntu 12.04 - keep getting "Server not found" for some websites

    - by android developer
    ever since last week , i've noticed that many websites cannot be accessed , and it doesn't matter if i use firefox or chromium as a web browser . as an example of such a website is: http://tutorials-android.blogspot.co.il/2011/05/layout-animation-in-android.html all i get is a "Server not found" error page . sometimes after a few refreshes it works just fine . i've checked it on a windows OS machine that is connected to the exact same LAN network , and the website is shown just fine . i've also checked the /etc/hosts file and it doesn't contain anything suspicious . what is going on? how can i fix it?

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  • winbind not working

    - by Yon
    I'm trying to set up winbind with an Active Directory running on Win2003. This works: net rpc user -S SOMEDOMAIN -U Administrator Password: Administrator ASPNET Demo Guest IUSR_SERVER20 IWAM_SERVER20 krbtgt RemoteUser SUPPORT_388945a0 This does not: wbinfo -u Error looking up domain users From the winbindd log: [2012/05/31 16:45:38, 1] nsswitch/winbindd_ads.c:ads_cached_connection(128) ads_connect for domain SOMEDOMAIN failed: Operations error [2012/05/31 16:46:38, 1] nsswitch/winbindd_util.c:trustdom_recv(230) Could not receive trustdoms ADS is not working with this domain. Why is winbind trying to use it instead of RPC? How can I force it to use only RPC and for all of this to work?

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  • Do background processes get a SIGHUP when logging off?

    - by Massimo
    This is a followup to this question. I've run some more tests; looks like it really doesn't matter if this is done at the physical console or via SSH, neither does this happen only with SCP; I also tested it with cat /dev/zero > /dev/null. The behaviour is exactly the same: Start a process in the background using & (or put it in background after it's started using CTRL-Z and bg); this is done without using nohup. Log off. Log on again. The process is still there, running happily, and is now a direct child of init. I can confirm both SCP and CAT quits immediately if sent a SIGHUP; I tested this using kill -HUP. So, it really looks like SIGHUP is not sent upon logoff, at least to background processes (can't test with a foreground one for obvious reasons). This happened to me initially with the service console of VMware ESX 3.5 (which is based on RedHat), but I was able to replicate it exactly on CentOS 5.4. The question is, again: shouldn't a SIGHUP be sent to processes, even if they're running in background, upon logging off? Why is this not happening? Edit I checked with strace, as per Kyle's answer. As I was expecting, the process doesn't get any signal when logging off from the shell where it was launched. This happens both when using the server's console and via SSH.

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  • IP to IP forwarding with iptables [centos]

    - by FunkyChicken
    I have 2 servers. Server 1 with ip 1.1.1.1 and server 2 with ip 2.2.2.2 My domain example.com points to 1.1.1.1 at the moment, but very soon I'm going to switch to ip 2.2.2.2. I have already setup a low TTL for domain example.com, but some people will still hit the old ip a after I change the ip address of the domain. Now both machines run centos 5.8 with iptables and nginx as a webserver. I want to forward all traffic that still hits server 1.1.1.1 to 2.2.2.2 so there won't be any downtime. Now I found this tutorial: http://www.debuntu.org/how-to-redirecting-network-traffic-a-new-ip-using-iptables but I cannot seem to get it working. I have enabled ip forwarding: echo "1" > /proc/sys/net/ipv4/ip_forward After that I ran these 2 commands: /sbin/iptables -t nat -A PREROUTING -s 1.1.1.1 -p tcp --dport 80 -j DNAT --to-destination 2.2.2.2:80 /sbin/iptables -t nat -A POSTROUTING -j MASQUERADE But when I load http://1.1.1.1 in my browser, I still get the pages hosted on 1.1.1.1 and not the content from 2.2.2.2. What am I doing wrong?

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  • How do I allow users to execute commands via ssh without allocating a pseudo-terminal

    - by Dani El
    I need to allow users to run a limited set of commands. But not to allow them to create interactive sessions. Just like GitHub does. If you try to ssh without a command it greetings you and close the session. I can acquire this by using ForceCommand some-script But getting in some-script i then need to eval user's input. Perhaps any other NoTTY-like option in sshd_config? --- UPDATE --- i'm looking for a pure SSH / Bash solution, not Perl/Python/etc. hacks.

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  • What is the best log rotator for Python wsgi applications ?

    - by Low Kian Seong
    I am running a wsgi based application that has concurrent users accessing it. For my logs needs I tried logrotate but found that logrotate is not too friendly to Python applications, so I tried using RotatingFileHandler and even worse found my logs all chopped up and part of it went missing! I am considering ConcurrentRotatingFileHandler, my question is, has anyone out there experienced the same thing and better yet do you have any battle tested solution for Python wsgi, concurrently accessed applications?

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  • what to do when ctrl-c can't kill a process?

    - by Dustin Boswell
    Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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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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  • Rendering a frame is producing noise from speakers in Windows and Linux

    - by Robber
    When any hardware accelerated application is rendering a frame (or many of them) a very short noise is coming from my speakers. This can be a game, a WebGL application or XBMC. When the application/game is rendering many frames per second (like most of them do) the noise is a continuous buzzing that gets higher pitched with higher framerates. This applies to Linux and Windows, so I'd assume it's a hardware problem. The current hardware in the PC is: CPU: Core2Quad Q9550 GPU: Radeon HD 5770 RAM: 2x2GB DDR2 Motherboard: Asus P5QLD PRO PSU: be quiet! Pure Power 530W Screen and speakers: Old 720p LCD TV connected via VGA and aux cable Muting the TV stops the noise, muting Windows doesn't. I tried replacing the PSU first (used a Tagan 700W PSU before) because I thought it was a power problem. It wasn't. I tried replacing the motherboard (used a ASUS P5B SE before) next because I thought it was a sound card problem. It wasn't. I tried the GPU in a different PC because I thought it was a broken graphics card. It worked perfectly fine in the other PC. I thought it might be interference, but moving the audio cable around changes absolutely nothing. I tried using an HDMI cable instead and that did work, but is not an option since my TV has only one HDMI input and I need that for my PS3.

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  • Need advice in setting up server. fastCGI, suExec, speed, security, etc.

    - by lewisqic
    I am running my own dedicated server with centOS 5 and WHM/cPanel. I would like to configure my server to meet my needs but I need a little help. It will only be my own websites being run on this server. I'm still a little green when it comes to server administration so please forgive my ignorance. What I Would Like to Have: I need some public directories to be writable (for user image uploads and things like that) but I don't want those directories to have 777 permissions. I need individual accounts to have the ability to set custom php settings for their own account without affecting other accounts, whether through a php.ini file or through .htaccess or any other method. I would like things to run as fast as possible, whether that means using a php optimizer or cacher, such as eaccelerator or xcache or anything else. I need things to be as secure as possible. Here Are My Questions What should I use for my php handler? DSO? CGI? fastCGI? suPHP? Other? Should I be using suEXEC? What are the benefits or downfalls of this? What php optimizer/cacher is best to use? Are there any other security tips I need to know about all of this? I'd appreciate any advice or direction that can be offered. Thanks!

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  • Kill program after it outputs a given line, from a shell script

    - by Paul
    Background: I am writing a test script for a piece of computational biology software. The software I am testing can take days or even weeks to run, so it has a recover functionality built in, in the case of system crashes or power failures. I am trying to figure out how to test the recovery system. Specifically, I can't figure out a way to "crash" the program in a controlled manner. I was thinking of somehow timing a SIGKILL instruction to run after some amount of time. This is probably not ideal, as the test case isn't guaranteed to run the same speed every time (it runs in a shared environment), so comparing the logs to desired output would be difficult. This software DOES print a line for each section of analysis it completes. Question: I was wondering if there was a good/elegant way (in a shell script) to capture output from a program and then kill the program when a given line/# of lines is output by the program?

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  • A way to auto cycle (close) through all screen sessions

    - by JBWhitmore
    I frequently use screen when I log into the interactive nodes to a supercomputer that I have access to -- and I often run things and move on. There are about 20 separate nodes that I can log into; and if I check any one of them I'll have something like 4 detached sessions. Each of those sessions will have maybe 5 screen sessions within that. Is there a quick way to cycle through all of these and close them down if they are not running any processes? My current process is to screen -ls and then screen -r #### then type exit until I'm back to the base screen.

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  • Add the "SAMBA File Server" role to a server running SCO Unix?

    - by I.T. Support
    We're trying to get network access to a hard drive on a server running SCO Unix from Windows Servers. I beleive we need to add the role "SAMBA File Server" to the server so we can mount the drive as a network share that we can access from Windows. Is it possible to add the SAMBA role to a SCO Unix operating system? Are there any gotchas or concerns? Thanks

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  • I can't write to a folder which I'm a member of

    - by user3265472
    I'm trying to setup folder access to a group so that all members of that group can create/edit/delete files within the folder. # create my group and add a member sudo addgroup dev sudo adduser martyn dev Now, logged in as "martyn", check my user has been added to "dev" group groups martyn martyn : martyn dev Now I want to change the group ownership of my project folder so all members of that group can edit it and files/folders within it. sudo chgrp -R dev myproject Just to check: martyn@localhost:/var/www$ ls -l total 4 drwxrwxr-x 3 dev dev 4096 May 31 15:53 myproject Now here's where it fails. I want to create a file within myproject (logged in as "martyn", a member of "dev"): vi myproject/test ..but when I try to save the file I get the following error: "myproject/test" E212: Can't open file for writing Why, as user "martyn" which is a member of "dev", can I not write this file? Even if I create the file so it exists, change the ownership to "dev" then try to edit and save - I get the same error.

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  • How do I run vino-server without a monitor attached in Ubuntu 10.04

    - by Ole
    I just upgraded to Ubuntu 10.04 yesterday on a headless home server. I use the server for a variety of purposes, and what I don't know how to do via SSH I've alway been able to do through VNC. However, since the upgrade vino-server will no longer run if there isn't a monitor attached. Before it used to start up without a problem. Even by attempting to run the server via SSH gives me a "could not load display" error. Summary: I need to get vino-server running at boot time on a server with Ubuntu 10.04, without a monitor attached.

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