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  • DHCP server inside a virtual machine can't see other machines

    - by William
    Hi, I setup a private network from virtual machines and one of the machines is the DHCP server for the group. I want to specify a next-server for the DHCP server but I'm having trouble connecting to any of the machines that I lease IPs to. I'm just trying to do a simple ping/ssh to 10.0.0.252 (a machine with a lease) but it doesn't seem to respond. Any advice? I'm assuming I need to be able to connect to my next-server but maybe I'm wrong. Thanks.

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  • After my laptop wakes up from sleeping/hibernating, the LCD/brightness is very low. How can I set it to default?

    - by meder
    In Power Management Preferences, On AC Power tab, I have brightness to 100%. "Dim display when idle" is not checked. I know for sure my LCD brightness is capable of going higher, because if I hit Fn and F7 then it resets the monitor brightness and settings for a few seconds, but the resolution breaks and then the brightness goes back. PS: OS is Debian Lenny ( I set the tags but for clarification ) and laptop is a Thinkpad.

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  • What is the best vfat driver for FUSE? (Lightweight, not mountlo)

    - by Vi
    FUSE filesystem list show some FuseFat and FatFuse. Both are old, FatFuse is read-only , FuseFat is non-buildable and probably depends on glib. Now I'm using mountlo for the task (mounting USB drives in generic way without root access or suid things (except of fusermount itself)), but it looks too big for such task. Is there good vfat FUSE driver?

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  • Set LD_LIBRARY_PATH and CLASSPATH on cluster nodes before running a hadoop job

    - by Ashish Sharma
    I need to set LD_LIBRARY_PATH and CLASSPATH before running a job a cluster. In LD_LIBRARY_PATH i need to add location of some jars which are required while running the job, As these jars are avaiable at my cluster, similar with CLASSPATH. I have a 3 NODE cluster, I need to set this LD_LIBRARY_PATH and CLASSPATH for all the 3 data nodes so that the following jar are available while running the job

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  • Gentoo+urxvt+terminus: How do I change font version?

    - by gaidal
    In my Debian installation I can type extended ASCII characters such as åäö by default using the terminus font, however in Gentoo I can't get it to work so far. Nothing happens when I hit those keys, like in this thread: Missing glyphs in Terminus font, how to setup a fallback font ? But in this case I know terminus supports those characters in at least some of its versions, since it's works in Debian. So what I want is to find out how to see and choose which of the many different terminus font files is being used. I set the font in the same way on both Debian and Gentoo, using URxvt*font: xft:terminus:size=xx in .Xdefaults. Both systems use en_US.UTF-8 as default locale.

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  • Why isn't passwordless ssh working?

    - by Nelson
    I have two Ubuntu Server machines sitting at home. One is 192.168.1.15 (we'll call this 15), and the other is 192.168.1.25 (we'll call this 25). For some reason, when I want to setup passwordless login from 15 to 25, it works like a champ. When I repeat the steps on 25, so that 25 can login without a password on 15, no dice. I have checked both sshd_config files. Both have: RSAAuthentication yes PubkeyAuthentication yes I have checked permissions on both servers: drwx------ 2 bion2 bion2 4096 Dec 4 12:51 .ssh -rw------- 1 bion2 bion2 398 Dec 4 13:10 authorized_keys On 25. drwx------ 2 shimdidly shimdidly 4096 Dec 4 19:15 .ssh -rw------- 1 shimdidly shimdidly 1018 Dec 4 18:54 authorized_keys On 15. I just don't understand when things would work one way and not the other. I know it's probably something obvious just staring me in the face, but for the life of me, I can't figure out what is going on. Here's what ssh -v says when I try to ssh from 25 to 15: ssh -v -p 51337 192.168.1.15 OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to 192.168.1.15 [192.168.1.15] port 51337. debug1: Connection established. debug1: identity file /home/shimdidly/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/shimdidly/.ssh/id_rsa-cert type -1 debug1: identity file /home/shimdidly/.ssh/id_dsa type 2 debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024 debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024 debug1: identity file /home/shimdidly/.ssh/id_dsa-cert type -1 debug1: identity file /home/shimdidly/.ssh/id_ecdsa type -1 debug1: identity file /home/shimdidly/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: sending SSH2_MSG_KEX_ECDH_INIT debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ECDSA 54:5c:60:80:74:ab:ab:31:36:a1:d3:9b:db:31:2a:ee debug1: Host '[192.168.1.15]:51337' is known and matches the ECDSA host key. debug1: Found key in /home/shimdidly/.ssh/known_hosts:2 debug1: ssh_ecdsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Offering RSA public key: /home/shimdidly/.ssh/id_rsa debug1: Authentications that can continue: publickey,password debug1: Offering DSA public key: /home/shimdidly/.ssh/id_dsa debug1: Authentications that can continue: publickey,password debug1: Trying private key: /home/shimdidly/.ssh/id_ecdsa debug1: Next authentication method: password

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  • QNAP TS-419p as a VPN Gateway?

    - by heisenberg
    Hello, I am hoping one of you might be able to help. I want to make files stored on shared folders on a QNAP TS-409p available to users over a VPN link. How is the possible? Can someone explain what I need to do. What do I need to do at the router and what do I need to do on the QNAP NAS? Effectively, what I want do do is use the built in Windows vpn client to connect to my home network and then be able to browse the shared folders. Thanks in advance.

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  • GRUB2 not detecting OS on raid partitions

    - by sleeves
    I have recently added a drive to a system and have successfully raid'ed (RAID-1) the paritions, with the exception of the boot partition. I have it ready and mirrored, but can't get GRUB2 (update-grub) to find it. System: Ubuntu 11.04 Raid Metadata: 1.2 If I run update-grub, it finds the kernel images on the /dev/sda2 partition (present root) but not the images on /dev/md127. /dev/md127 is composed of "missing" and "/dev/sdb2". fdisk on /dev/sdb confirms that sdb2 is of type fd (raid autodetect) and is also flagged bootable. I have two things I want to do. Make the boot.cfg on /dev/sdb2 have a menu option to have the root be /dev/md127 Install grub onto /dev/md127 so the actual boot.cfg from there is being used. Thanks!

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  • Free Hosting control panel

    - by John Maxim
    Hello All, I'm in the mid of researching for one of the best hosting control panels. The server I run is Ubuntu and I have some experience with ISPConfig 2 & 3. Since I haven't explored any others available, what are the recommended ones for an Ubuntu server? I asked because I find that there seems to be some disabling and modifications required for an Ubuntu server if I need to use ispconfig which causes the server to change its actual way of running. It's quite good though, but any more recommended ones ? Something more organic? which doesn't require much breaking and changing. I'm not asking for the simple one, I don't mind going extra mile to install a powerful one but just try sticking with most Ubuntu's conventions will be an ideal one for me. And of course, if there happens to be something that meets the requirement as mentioned "Ubuntu conventions" and also simple to install at the same time, that'd be a bonus. Thanks in advance.

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  • Hadoop Rolling Small files

    - by Arenstar
    I am running Hadoop on a project and need a suggestion. Generally by default Hadoop has a "block size" of around 64mb.. There is also a suggestion to not use many/small files.. I am currently having very very very small files being put into HDFS due to the application design of flume.. The problem is, that Hadoop <= 0.20 cannot append to files, whereby i have too many files for my map-reduce to function efficiently.. There must be a correct way to simply roll/merge roughly 100 files into one.. Therefore Hadoop is effectively reading 1 large file instead of 10 Any Suggestions??

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  • Is there a version of Debian-Lenny that is legal for export from the US?

    - by molecules
    I wanted to bundle my application in a Debian-Lenny Virtual Machine so others could download it and run it without having to configure anything. However, I don't want to have to worry about US legal issues. Many of the packages in a default Debian installation include encryption algorithms. Are all default versions export-safe?    If not, is there an export-safe version?       If not, is there an easy way to make one?

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  • rsnapshot stats

    - by Obscur Moirage
    I'd like to retrieve the following stats from rsnapshot files synced added files modded files deleted files Is there a feature to retrieve these in rsnapshot, or is there another product that's able to do it? EDIT: As requested, I'll try to show that I'm not just asking what I want to do without any research. I wasn't able to locate any rsnapshot feature doing this. Maybe I'm searching in a wrong direction. So, I've built a not very pretty script, called each time before rsnapshot is ran. This Perl script stores each file MD5, in order to compare backup files structures between rsnapshot updates. I'm pretty sure it's worthless to show this code here. I think that keeping an eye on what change on a server, for example, is a useful feature. So, I'm asking. @pauska Most of the time, I'm trying to search for an answer myself, which is not the case here. Thanks

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  • How to set up a server without a hosting control panel

    - by A4J
    I have always used a control panel on my dedicated servers - from cPanel to Plesk to Virtualmin, and I am now considering ditching a CP altogether and manually editing config files. My requirements are fairly simple, I will host multiple sites on the server; some Apache with PHP & Mysql and some Passenger with Rails & Postgres. All will require email smtp/pop. FTP/Stats will not be required. Could someone please give me a quick run-down of what I would need to do - in terms of installing software and configuration? My server will come with a base install of CentOS 6.4 minimal. My thoughts so far: Install/update latest versions of MySQL & Postgres (are they 'safe' out of the box? Or do I need to do anything else like set up root passwords etc?) Install Apache & PHP (again, are the base installs good to go or do they require security tweaks?) Set up nameservers/hostnames/reverse DNS etc (Any guides on how to do this please?) Install Rubygems Install and configure Dovecot and Postfix (any tips on doing this? Or links to how-tos that cover it please?) Set up each website - any links to guides on how to do this? Install/configure firewall (or is the default install good to go?) Any other tips or advice would be greatly appreciated, as would links to guides or how-tos.

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  • Why does my CentOS logrotate run at random times?

    - by Mike Pennington
    I put a logrotate configuration file in /etc/logrotate.d/ and expected the logs to rotate at a consistent time; however, they do not... log rotation times are seemingly random +/- one hour. Why are the log rotation start times random, and how can I change this? Informational: my logrotate config file looks like this... /opt/backups/network/*.conf { copytruncate rotate 30 daily create 644 root root dateext maxage 30 missingok notifempty compress delaycompress postrotate ## Create symbolic links in daily/ PATH=`/usr/bin/dirname $1`; FILE=`/bin/basename $1`; /bin/ln -s $1 $PATH/daily/$FILE endscript }

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  • Iptables - forward email ports?

    - by Emmet Brown
    im trying to open some local ports (LAN) and then re-direct them to another server (WAN) using iptables. Here is my config: #WAN allow-hotplug eth1 auto eth1 iface eth1 inet static #Tarjeta red WAN address 192.168.2.2 gateway 192.168.2.1 netmask 255.255.255.0 #LAN allow-hotplug eth0 auto eth0 iface eth0 inet static address 192.168.16.6 netmask 255.255.255.0 network 192.168.16.0 broadcast 192.168.16.255 I try this: iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 110 -j DNAT --to 200.40.30.218:110 iptables -A FORWARD -p tcp -i eth0 -o eth1 -d 200.40.30.218 --dport 110 -j ACCEPT iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 25 -j DNAT --to 200.40.30.218:25 iptables -A FORWARD -p tcp -i eth0 -o ethq -d 200.40.30.218 --dport 25 -j ACCEPT but, it did not work. i also try changeing eth0 to eth1 (and eth1 to eth0) but nothing happened. Starting Nmap 5.00 ( http://nmap.org ) at 2011-10-03 14:44 UYST Interesting ports on 192.168.16.6: Not shown: 997 closed ports PORT STATE SERVICE 22/tcp open ssh 111/tcp open rpcbind 8080/tcp open http-proxy Im running debian. Can u guys help me to check what is happening? edit: IPTABLES-SAVE # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *mangle :PREROUTING ACCEPT [139993:77867651] :INPUT ACCEPT [139385:77761761] :FORWARD ACCEPT [186:12071] :OUTPUT ACCEPT [173556:74341650] :POSTROUTING ACCEPT [173734:74352988] COMMIT # Completed on Mon Oct 3 15:43:14 2011 # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *nat :PREROUTING ACCEPT [1649:190626] :POSTROUTING ACCEPT [6729:339646] :OUTPUT ACCEPT [6697:337660] -A PREROUTING -i eth0 -p tcp -m tcp --dport 110 -j DNAT --to-destination 200.40.30.218:110 -A PREROUTING -i eth0 -p tcp -m tcp --dport 25 -j DNAT --to-destination 200.40.30.218:25 COMMIT # Completed on Mon Oct 3 15:43:14 2011 # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *filter :INPUT ACCEPT [138307:77066136] :FORWARD ACCEPT [168:11207] :OUTPUT ACCEPT [172288:73655708] -A FORWARD -d 200.40.30.218/32 -i eth0 -o eth1 -p tcp -m tcp --dport 110 -j ACCEPT -A FORWARD -d 200.40.30.218/32 -i eth0 -o ethq -p tcp -m tcp --dport 25 -j ACCEPT COMMIT # Completed on Mon Oct 3 15:43:14 2011 Regards

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  • Ubuntu 12.04 as router with 2 nic

    - by Blue Gene
    I have been trying this setup for weeks and still can not make this to work... ubuntu 12.04 64 bit with 2 nic nic1: eth0:192.168.2.33 -static ip with internet access (connected to modem) nic2: eth1:192.168.1.2 -static ip connected to LAN. enabled ip_forward on ubuntu box net_ip_forward = 1 on the LAN with ip address 192.168.1.5 specified gateway as 192.168.1.2 and able to ping gateway.But can not ping public address.What am i missing? on router box: route -n Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.2.1 0.0.0.0 UG 100 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 tried ip route add 192.168.2.0/24 via 192.168.1.2 dev eth0 route -n on LAN 192.168.1.5 Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.2 0.0.0.0 UG 100 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.2.0 192.168.1.2 255.255.255.0 UG 0 0 0 eth0 iptables default policy is to accept all. tracepath 8.8.8.8 from LAN 1: 192.168.1.5 0.060ms pmtu 1500 1: 192.168.1.2 3.367ms 1: 192.168.1.2 3.764ms 2: no reply Is there a way to make this work,other than NAT ing.

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  • Apache on Ubuntu very slow on inital calls, very fast afterwards

    - by papakost
    I own an Ubuntu 10 VPS Server with Apache 2 hosting a Magento website. The first hit to the site from any client takes about 15-20 sec, while the subsequent hits from the same client take 0-1 sec. I suppose it doesn't have to do with Magento caching, because this happens also when the first call is on a very light page and the next calls are on heavy ones. Does anyone have an idea on what is going wrong here?

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  • Weird nfs performance: 1 thread better than 8, 8 better than 2!

    - by Joe
    I'm trying to determine the cause of poor nfs performance between two Xen Virtual Machines (client & server) running on the same host. Specifically, the speed at which I can sequentially read a 1GB file on the client is much lower than what would be expected based on the measured network connection speed between the two VMs and the measured speed of reading the file directly on the server. The VMs are running Ubuntu 9.04 and the server is using the nfs-kernel-server package. According to various NFS tuning resources, changing the number of nfsd threads (in my case kernel threads) can affect performance. Usually this advice is framed in terms of increasing the number from the default of 8 on heavily-used servers. What I find in my current configuration: RPCNFSDCOUNT=8: (default): 13.5-30 seconds to cat a 1GB file on the client so 35-80MB/sec RPCNFSDCOUNT=16: 18s to cat the file 60MB/s RPCNFSDCOUNT=1: 8-9 seconds to cat the file (!!?!) 125MB/s RPCNFSDCOUNT=2: 87s to cat the file 12MB/s I should mention that the file I'm exporting is on a RevoDrive SSD mounted on the server using Xen's PCI-passthrough; on the server I can cat the file in under seconds ( 250MB/s). I am dropping caches on the client before each test. I don't really want to leave the server configured with just one thread as I'm guessing that won't work so well when there are multiple clients, but I might be misunderstanding how that works. I have repeated the tests a few times (changing the server config in between) and the results are fairly consistent. So my question is: why is the best performance with 1 thread? A few other things I have tried changing, to little or no effect: increasing the values of /proc/sys/net/ipv4/ipfrag_low_thresh and /proc/sys/net/ipv4/ipfrag_high_thresh to 512K, 1M from the default 192K,256K increasing the value of /proc/sys/net/core/rmem_default and /proc/sys/net/core/rmem_max to 1M from the default of 128K mounting with client options rsize=32768, wsize=32768 From the output of sar -d I understand that the actual read sizes going to the underlying device are rather small (<100 bytes) but this doesn't cause a problem when reading the file locally on the client. The RevoDrive actually exposes two "SATA" devices /dev/sda and /dev/sdb, then dmraid picks up a fakeRAID-0 striped across them which I have mounted to /mnt/ssd and then bind-mounted to /export/ssd. I've done local tests on my file using both locations and see the good performance mentioned above. If answers/comments ask for more details I will add them.

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  • Remotely enter encryption key?

    - by Jason Swett
    This might be a really dumb question but here goes, anyway. I just bought a couple servers. I already installed Ubuntu with encrypted LVM on one and I'm planning on doing the same with the other. This means that every time I boot up each of these machines, I have to enter the passphrase. And I'll have to do this every morning because I'll power each machine off each night for security reasons. Here's the problem: I don't have monitors or keyboards for these servers. It seems to me I have two options: Somehow enter the passphrase remotely Buy a KVM switch I doubt #1 is an option but I want to make sure it's not before I buy a KVM. Is it possible to enter the passphrase remotely? AND is it a good idea?

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  • Moving directories full of files over the top

    - by JavaRocky
    I took a backup of a directory which has a number directories and files inside them. Recently some files have gone missing. I would like to just move over the missing files. I prefer moving files instead of just copying as space is a premium on this particular box and the files are quite large. How can i achieve this?

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  • Launch script after SFTP disconnect

    - by Mates
    I'm currently using Caja (basically the same as Nautilus) to connect using SSH to my server and work with files. What I'm looking for is a way to launch a simple script when I disconnect - I can launch a script after disconnecting from the TTY by putting it into ~/.bash_logout file, but that is not executed when disconnecting from a file manager. The only idea I have is to set up a cronjob which would be checking for existing sftp-server or sshd processes periodicaly and launched the script when there's no such process running. Is there any easier way to do this?

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  • How to change font size on display

    - by Tim
    My laptop is Lenovo T400, whose screen size is 14.1 inches and default resolution is 1440 x 900. My main OS is Ubuntu 10.10. The default font size on the display is somehow small, which might contribute to the fatigue of my eyes. My previous laptop is Acer 5000, whose screen size is 15.4 inches and the default resolution is 1024 x 768. I like reading on my old laptop better than on my new one. Is it possible to change the setting of my new one to look like reading my old one? What are the parameters that control the font size? Are screen size, resolution part of them? In Windows, there are choices for font size, while in Ubuntu I haven't find out where I can change the setting and would like know if someone here knows about it. I also wonder if I can use a separate bigger display (perhaps just like a desktop display) as the display of my laptop, in case I don't want to enlarge font size at the cost of sacrificing the amount of the content to display, and how I shall do it? Thanks and regards!

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