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  • "pull" process/job into the background

    - by Mustafa Ismail Mustafa
    I know of terminating a command with & and then moving it into the background by pressing Ctrl-Z and then bg [pid], and I also know of nohup. But say you started a process that turned out to take much longer than one expected, is there a way of pulling, so to speak, this process from another terminal screen into the background so that even if I log off from the server the process would continue?

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  • Running resize2fs on /

    - by Paul Steckler
    I'm trying to resize an ext4 filesystem on a Fedora 11 box. Using fsdisk and lvm, I was able to grow the partition and logical volume containing the filesystem. When I try to run resize2fs on the device containing the filesystem (/dev/sda2 in this case), I get: "Device or resource busy while trying to open /dev/sda2, Couldn't find valid filesystem superblock" I've tried this from a rescue disk that doesn't have the filesystem mounted, no joy. Maybe resize2fs doesn't know about ext4?

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  • Configure postfix to filter email into hold queue

    - by Ian
    Hey, I would like postfix to send all emails received on SMTP off to an external process, which will decide whether to allow them through as normal, or whether to put them into the hold queue (or another quarantine area), where they have to wait for admin approval. I was thinking of doing this with an after-queue content filter, which uses pipe(8) to run a script on each message, and the script itself will spawn "postsuper -h " if it decides to put the message on hold. Then the admin can do postsuper -d or -r to delete or pass the message on as appropriate. So, my questions are - a) will this work, and b) is this the best way to do it? Would a milter or another type of content filter be a better approach?

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  • fail2ban block ports rules iptable

    - by J Spen
    I just installed Ubuntu Server 14.04 and don't have much experience with IPtables. I am trying to get a basic setup going where I only accept SSH connections on port 22 and 2222. I actually have that working with no problem using fail2ban ssh. Then I wanted to block all other ports except 423 and 4242 but either method of DROPing all connections that are not listed seems not to work and it blocks me out of everything. Below is the setup that works: -P INPUT ACCEPT -P FORWARD ACCEPT -P OUTPUT ACCEPT -N fail2ban-ssh -A INPUT -p tcp -m multiport --dports 22,2222 -j fail2ban-ssh -A fail2ban-ssh -j RETURN I tried to change it either to: -P INPUT DROP -P FORWARD ACCEPT -P OUTPUT ACCEPT -N fail2ban-ssh -A INPUT -p tcp -m multiport --dports 22,2222 -j fail2ban-ssh -A fail2ban-ssh -j RETURN or: -P INPUT ACCEPT -P FORWARD ACCEPT -P OUTPUT ACCEPT -N fail2ban-ssh -A INPUT -p tcp -m multiport --dports 22,2222 -j fail2ban-ssh -A INPUT -j DROP -A fail2ban-ssh -j RETURN I have noticed that the rules for fail2ban-ssh are automatically added to my iptables on boot because if I save them with iptables-persistant they are entered twice. How do I go about blocking everything accept those 2 ports using fail2ban? Is it a bad fail2ban configuration or do I need to add the fail2ban-ssh -j Return somewhere else in my code.

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  • Recovering/Creating NewWorld Partition on Mac G4 (PPC) after botched Debian Install

    - by Luis Espinal
    I was trying to install Debian 5.04 on a Mac G4, and in typical geek tradition, I didn't RTFM. During installation, I nuked all existing partitions, creating new to my liking. But as I learned later during the installation process, yaboot needed a NewWorld partition, so I can't boot the installation. I don't have any OSX CDs with me (this is a used G4 I purchased of craigslist) with which to create a HFS partition. I've re-run the Debian installer, which lets me create a partition that is supposed to be of type 'NewWorld', but the installer does not seem to like it or recognizes it. Any ideas how to proceed from here? Thanks.

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  • Sftp via shell - how it is possible

    - by Tomasz Zielinski
    (Moved from StackOverflow: http://stackoverflow.com/questions/4589725/sftp-via-shell-how-it-is-possible) How is it possible for tools like http://mysecureshell.sourceforge.net/ to provide SFTP access by merely specifying them as shell by typing: usermod -s /bin/MySecureShell myuser ? I'm on Debian Lenny, with default sshd/OpenSSH. Is this e.g. a feature of SSH protocol that allows user shell to handle sftp commands? I can't wrap my head around this because usually OpenSSH needs sftp-server module (or the internal one in newer versions) - and this makes me think that sftp commands don't even hit the shell and are handled earlier or by different code path..

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  • If I exchange the CPU, must I reinstall the OSes? (swapping cpus from one *nix-like to another)

    - by dag729
    Hi, as suggested by the title, I want to change CPU: actually I have two computers, one with Ubuntu running on an AMD Athlon 64 dual core 5200+ and the other with FreeBSD running on an AMD Sempron single core LE-1250. I would like to swap (I am not sure that this is the correct term...) the CPUs from one computer to the other one, that is take the dual core from the ubuntu pc and put it inside the freebsd pc and viceversa. The mobo is the same. Do you think I will encounter problems?

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  • My new Intel X25-M G2 and the alignment thingy

    - by Oli
    I just bought a new SSD for my laptop, which is going to be a server running ArchLinux with grub2, GPT and btrfs. My layout should look like this: (grub-partition?) /boot ext2 75MB / btrfs 15GB /home btrfs remaining What do I need to do to create these partitions in a correctly aligned fashion using parted? Do I need to consider alignment when formatting each partition with the desired file system?

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  • freeradius maximum session time problem

    - by haw3d
    hello I'm using openvpn and free-radius for control user accounts. for maximum session time for an user, free-radius has sqlcounter.conf that control that, but after a connection has disconnected that is useful and cannot destroy a connection. for control account time dynamically i need another script that do that. but should anytime that a connection has established a trigger run. is anyway to fire a custom trigger or script when a connection has established? or any way to control session time dynamically?

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  • Monit can't detect MySQL, but I can

    - by Matchu
    Monit is configured to watch MySQL on localhost at port 3306. check process mysqld with pidfile /var/lib/mysql/li175-241.pid start program = "/etc/init.d/mysql start" stop program = "/etc/init.d/mysql stop" if failed port 3306 protocol mysql then restart if 5 restarts within 5 cycles then timeout My application, which is configured to connect to MySQL via localhost:3306, is running just fine and can access the database. I can even use MySQL Query Browser to connect to the database remotely via port 3306. The port is totally open and possible to connect to. Therefore, I'm pretty darn certain that it's running. However, running monit -v reveals that Monit cannot detect MySQL on that port. 'mysqld' failed, cannot open a connection to INET[localhost:3306] via TCP This happens consistently, until Monit decides not to track MySQL anymore, as configured. How can I begin to troubleshoot this issue?

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  • How to determine the Kerberos realm from an LDAP directory?

    - by tstm
    I have two Kerberos realms I can authenticate against. One of them I can control, and the other one is external from my point of view. I also have an internal user database in LDAP. Let's say the realms are INTERNAL.COM and EXTERNAL.COM. In ldap I have user entries like this: 1054 uid=testuser,ou=People,dc=tml,dc=hut,dc=fi shadowFlag: 0 shadowMin: -1 loginShell: /bin/bash shadowInactive: -1 displayName: User Test objectClass: top objectClass: account objectClass: posixAccount objectClass: shadowAccount objectClass: person objectClass: organizationalPerson objectClass: inetOrgPerson uidNumber: 1059 shadowWarning: 14 uid: testuser shadowMax: 99999 gidNumber: 1024 gecos: User Test sn: Test homeDirectory: /home/testuser mail: [email protected] givenName: User shadowLastChange: 15504 shadowExpire: 15522 cn: User.Test userPassword: {SASL}[email protected] What I would like to do, somehow, is to specify per-user basis to which authentication server / realm the user is authenticated against. Configuring kerberos to handle multiple realms is easy. But how to I configure other instances, like PAM, to handle the fact that some users are from INTERNAL.COM and some from EXTERNAL.COM? There needs to be an LDAP lookup of some kind where the realm and the authentication name is fetched from, and then the actual authentication itself. Is there a standardized way to add this information to LDAP, or look it up? Are there some other workarounds for a multi-realm user base? I might be ok with a single realm solution, too, as long as I can specify the user name - realm -combination for the user separately.

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  • What are "build-essential" & "build-dep"?

    - by Adam Siddhi
    I am researching how to install Ruby 1.9.1 in Xubuntu 10.04 and I came across the command build-essential and build-dep multiple times. Sometimes it is followed by packages and sometimes it is both preceded and post-ceded by packages. The 2 examples I am looking at are: sudo apt-get install build-essential zlib1g zlib1g-dev zlibc libruby1.9 libxml2 libxml2-dev libxslt-dev sudo apt-get build-dep ruby1.9 and sudo apt-get install ruby irb ri rdoc ruby1.8-dev libzlib-ruby libyaml-ruby libreadline-ruby libncurses-ruby libcurses-ruby libruby libruby-extras libfcgi-ruby1.8 build-essential libopenssl-ruby libdbm-ruby libdbi-ruby libdbd-sqlite3-ruby sqlite3 libsqlite3-dev libsqlite3-ruby libxml-ruby libxml2-dev

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  • /etc/init.d/libvirtd start fails but service libvirtd start works. Why?

    - by Gregg
    CentOS 6.3, running as root (Shush). Can you please tell me why I would get initialisation failures from the init scripts but the service command works a treat? There was nothing in /var/log/messages or /var/log/libvirt/* all I have it the Terminal output: /etc/init.d/libvirtd start Starting libvirtd daemon: libvirtd: initialization failed [FAILED] I changed the libvirtd logging level to 1, the highest, but saw nothing in messages after another failure.

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  • tile a window with a hotkey on Ubuntu

    - by Eli Bendersky
    On Windows I use an AutoHotKey script to tile the active window to the left half of the screen, the right half, or a few other options. Does Ubuntu/Gnome have a program that would allow me to do that? If not, do you have an idea how to create this programmatically, or at least can point me to a resource?

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  • how to disable these logs on the screen?

    - by user62367
    using Fedora 14: http://pastebin.com/raw.php?i=jUvcfugw i mount an anonym Samba share [checks it in every 5 sec] it's working, ok, great! But: when i shut down my Fedora box, i can see the lines containing this scripts lines! Many times, about ~50x on the screen. How could i disable these lines when shutting down? I [and other people] don't want to see those lines for about ~ 5 sec Thank you!

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  • Bacula Director and Storage in LAN

    - by B14D3
    I have two networks LAN and DMZ.. Machines in DMZ are accesible from internet ( only over http). In LAN I have servers that see all LAN and all DMZ machines but machinse from DMZ don't see any LAN servers. Machines in LAN have access only to all LAN and DMZ, no direct access to internet and no access from internet. DMZ <------ LAN DMZ ----X--->LAN I'm planning to configure Bacula as major backup system. My plan is to install Bacula Director and Storage deamon on the same server in LAN for safety reasons. So my question is: Will this configuration work, is it posible for bacula director and storage deamon installed on server in LAN to makes backup servers that are in my DMZ? Or in this network configuration Bacula should be in DMZ? (If yes will I can backup with it servers in LAN ?)

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  • Centos Server/MySQL server problem

    - by Jake
    Hello all, I currently run a website we get about 15,000-20,000 hits a day. We currently run a very active forum, that is hosted using Vbulletin software. We have 4.5 Million Posts, 80,000 Threads, with about 11,000 members of which just under a third is active all the time. Now I am running a Intel Xeon Quad Core (2.13Ghz) with 4GB of RAM, Centos 5.5 and running DirectAdmin on the box to manage it. I also run the current stable version of Apache, MySQL, and php. This is the only site that is hosted on this machine. Now during random times of day sometimes when it gets busy the server load can get to like 20, but this can also happen when we only have like 200 users active too. I dont understand what is causing these problems. Sometimes I get pages that can generate in .2 seconds other times it takes like 5-8 seconds. I have customized the my.cnf file and that has not helped out anything, I didnt know where else to turn so if anyone has any suggestions please let me know. Thank You In advance.

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  • Can enabling a RAID controller's writeback cache harm overall performance?

    - by Nathan O'Sullivan
    I have an 8 drive RAID 10 setup connected to an Adaptec 5805Z, running Centos 5.5 and deadline scheduler. A basic dd read test shows 400mb/sec, and a basic dd write test shows about the same. When I run the two simultaneously, I see the read speed drop to ~5mb/sec while the write speed stays at more or less the same 400mb/sec. The output of iostat -x as you would expect, shows that very few read transactions are being executed while the disk is bombarded with writes. If i turn the controller's writeback cache off, I dont see a 50:50 split but I do see a marked improvement, somewhere around 100mb/s reads and 300mb/s writes. I've also found if I lower the nr_requests setting on the drive's queue (somewhere around 8 seems optimal) I can end up with 150mb/sec reads and 150mb/sec writes; ie. a reduction in total throughput but certainly more suitable for my workload. Is this a real phenomenon? Or is my synthetic test too simplistic? The reason this could happen seems clear enough, when the scheduler switches from reads to writes, it can run heaps of write requests because they all just land in the controllers cache but must be carried out at some point. I would guess the actual disk writes are occuring when the scheduler starts trying to perform reads again, resulting in very few read requests being executed. This seems a reasonable explanation, but it also seems like a massive drawback to using writeback cache on an system with non-trivial write loads. I've been searching for discussions around this all afternoon and found nothing. What am I missing?

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  • Remapping characters in xmodmap

    - by Jacob R
    I am using a Swedish keyboard, and I want to be able to type braces easier. I planned to map AltGr + å to '}' and AltGr + ä to '{'. However, nothing really changes. I have some other stuff in my .Xmodmap so I know that it gets loaded allright. Here's what I have so far: keycode 35 = slash asciitilde dead_ogonek section dead_ogonek section keycode 49 = asciicircum onehalf keycode 66 = F10 clear Lock keycode 34 = aring Aring braceleft keycode 48 = adiaeresis Adiaeresis braceright where the 2 last lines are the one that should be related to this. What could I be doing wrong?

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  • 3 monitors, 2 X screens, Twinview not working as expected

    - by mononym
    Hi Guys, I have 3 monitors on 2 graphics cards (both nvidia) to get all 3 working i set 2 as twinview and one to have its own x screen. but when i do this, the twinview screens (which previously worked like 2 seperate screens) now work as one, ie a maximised window is across both screens How can i get the twinview to work as 2 seperate screens again?

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  • Installing Apache to CentOs 5.7 (problems with repo)

    - by C.S.Putra
    I'm installing Apache on CentOS 5.7, I followed instructions here : http://www.if-not-true-then-false.com/2010/install-apache-php-on-fedora-centos-red-hat-rhel/ I've installed this also : Remi Dependency on CentOS 5 and Red Hat (RHEL) 5 ## rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm When I install this, there's warning: /var/tmp/rpm-xfer.Bqu2xo: Header V3 DSA signature: NOKEY, key ID 217521f6 But it says that the package is alread installed. Then I move on to 3rd steps: yum --enablerepo=remi install httpd php php-common But it says: error getting repository data for remi, repository not found. Why is it like that?

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  • sSMTP Configuration Question

    - by SevenCentral
    I've installed sSMTP on Ubuntu 10.04 via: sudo apt-get install ssmtp My configuration file is: # # Config file for sSMTP sendmail # # The person who gets all mail for userids < 1000 # Make this empty to disable rewriting. [email protected] # The place where the mail goes. The actual machine name is required no # MX records are consulted. Commonly mailhosts are named mail.domain.com mailhub=smtp.gmail.com:587 # Where will the mail seem to come from? #rewriteDomain= # The full hostname hostname=somedomain.com # Are users allowed to set their own From: address? # YES - Allow the user to specify their own From: address # NO - Use the system generated From: address #FromLineOverride=YES [email protected] authpass=**** usestarttls=yes Am I transmitting my credentials in clear text? Is calling ssmtp a secure operation? Thanks.

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