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• How to add a broadcast address to loopback with ifconfig on a OS/X?

  - by chrisapotek

  I am trying to use ifconfig to turn on broadcast on my loopback interface. It currently reads: lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 As you can see, no broadcast address! :( :( :( I tried this on OS/X but it did not work and it did not give any error or feedback: ifconfig lo0 broadcast 127.255.255.255 Any guru would know that? I have one server that sends one packet. I have two clients running on the same machine as the server. I need them to pick up the packet WITHOUT having to force the server to send it twice.

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• How does one delete a directory filled with files and other subdirectory permanently, bypassing the trash, from the command line in OS X?

  - by Jon

  So my command line skills are a little rusty and I'm having trouble remembering the differences between the meanings of flags in different distro's os's. I also don't really remember all my technical lingo so manpages seem really unclear. Basically I'm on Mac OS X and want to delete a directory along with all of its contents. What I'm mainly concerned about, I suppose, is that it'll delete literally ALL of the references within the directory, including ../ and ../<everything else, including ../'s own ../> and then just totally screw up my entire system. Which of these do I want to run? $ rm -R dir-name/ or $ rm -r

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• How do I force a specific MTU for only certain TCP ports?

  - by Dave S.

  Background I have a set of embedded hardware deployed in the field. These remote machines connect back to my servers at AWS running Ubuntu and I use the iptables mangle chain to lower the MTU to 500 so these devices are happy. For reference, this is the iptables rule I am using: -A POSTROUTING -p tcp --sport 12345 --tcp-flags SYN,RST SYN -o eth0 -j TCPMSS --set-mss 500 Current Problem I'm trying to spin up some servers on the Joyent Cloud using SmartOS, but I can't find any information on selectively changing the MTU like I can on Linux (e.g. all info I've found is on changing it globally, which is not what I want). How would I do it so that all connections on TCP port 12345 get the MTU I want?

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• NTFS write speed really slow (<15MB/s)

  - by Zulakis

  I got a new Seagate 4TB harddrive formatted with ntfs using parted /dev/sda > mklabel gpt > mkpart pri 1 -1 mkfs.ntfs /dev/sda1 When copying files or testing writespeed with dd, the max writespeed I can get is about 12MB/s. The harddrive should be capable of atleast 100MB/s. top shows high cpu usage for the mount.ntfs process. The system has a AMD dualcore. This is the output of parted /dev/sda unit s print: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 7814037168s Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 2048s 7814035455s 7814033408s pri The used kernel is 3.5.0-23-generic. The ntfs-3g versions I tried are ntfs-3g 2012.1.15AR.1 (ubuntu 12.04 default) and the newest version ntfs-3g 2013.1.13AR.2. When formatted with ext4 I get good write speeds with about 140MB/s. How can I fix the writespeed?

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• Mounting LVM2 volume with XFS filesystem

  - by Chris

  Unfortunately I'm not able to access the data on my NAS anymore. I can't figure out why this is the case as I haven't changed anything. So I plugged one of the harddisks in my computer to access the data. What I did: kpartx -a /dev/sdc Now I should be able to access /dev/mapper/vg001-lv001 When trying to mount it I get: sudo mount -t xfs /dev/mapper/vg001-lv001 /home/user/mnt mount: /dev/mapper/vg001-lv001: can't read superblock Now I did a parted -l which gave me Modell: Linux device-mapper (linear) (dm) Festplatte /dev/mapper/vg001-lv001: 498GB Sektorgröße (logisch/physisch): 512B/512B Partitionstabelle: loop Number Begin End Size Filesystem Flags 1 0,00B 498GB 498GB xfs Does anybody have a solution how to recover the data?

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• Add "secure" in cookie by httpd server

  - by Abhishek

  How do I have to configure my httpd server to add "Secure" in the cookies? I tried the one in the below link, http://blog.modsecurity.org/2008/12/fixing-both-missing-httponly-and-secure-cookie-flags.html but this did not seem to be working. I inspected the cookie via firebug and found that the cookies have "HttpOnly" but not "Secure". I double checked the configurations and they the same as mentioned in the link. I also noticed that the server response time goes bit high when doing it by mod_security. Is there a better way to do it? Any ideas or pointers to configurations would be helpful

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• kernel warning disk error for command write - solaris svm

  - by help_me

  Recently this warning came up on my message logs, scsi: [ID 107833 kern.warning] WARNING: /pci@1c,600000/scsi@2/sd@0,0 (sd0): Oct 27 00:14:44 Error for Command: write(10) Error Level:Retryable Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Requested Block: 101515828 Error Block: 101515828 Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Vendor: SEAGATE Serial Number: 0441B9B5H Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Sense Key: Hardware Error Oct 27 00:14:44 scsi: [ID 107833 kern.notice] ASC: 0x19 (defect list error), ASCQ: 0x0, FRU: 0x2 This is showing signs of disk failing in my opinion. I have not seen the messages re-occurring. This is on a Solaris 9 Sparc system V240. The disks are managed by SVM and "metadb" is showing the flags as "a" Are there any tests or indications as to check/see if the disk is actually failing or was that error message initiated by something else. Thank you!

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• How to set which IP to use for a HTTP request?

  - by GetFree

  This is probably a silly question. I'm doing some http requests using wget from the command line, and I want those connections to be made through one specific IP of the 4 IPs my server has. Those http requests go to one specific range of IPs so I only want those to be routed differently. The 4 interfaces in my server are eth0, eth0:0, eth0:1, eth0:2. I tried with the following command: route add -net 192.164.10.0/24 dev eth0:0 But when I see the routing table it says: Destination Gateway Genmask Flags MSS Window irtt Iface 192.164.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 The interface is set to eth0 not eth0:0 as my command says. What am I doing wrong?

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• How to list down hosts with nmap 5.51

  - by Wild Bill

  I was using nmap 5.21 with the -PN, -F and --reason flags in version 5.21. I was outputting the results to an XML file. It would list ALL hosts (say I gave it a /24 subnet to scan. I then updated to 5.51 and ran the exact same command, but it no longer lists down hosts, just ones that are up. Is there a new flag to list down hosts? OR did this get removed in 5.51? My full options are: -sS -n -PN -SV -F --reason I've also used and removed --open but it will not list down hosts in my XML output.

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• Unable to access internet if wireless enabled

  - by balki

  The following is my route output. eth0 is my wired network and eth1 is my wireless network. Only wired one has access to internet. If I enable wireless, I am not able to access internet, it tries to access via eth1 and I get 404 page of the wireless router. Why does eth1 have higher preference though default is eth0 (link)? [balakrishnan@mylap ~]$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 10.26.0.1 0.0.0.0 UG 0 0 0 eth0 10.26.0.0 * 255.255.192.0 U 1 0 0 eth0 link-local * 255.255.0.0 U 1000 0 0 eth0 192.168.1.0 * 255.255.255.0 U 9 0 0 eth1

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• Ubuntu 12.04 3.2 Kernel showing incorrect "cache size" in cpuinfo?

  - by Tom G

  2x Xeon E5620 . 16 Cores altogether. /proc/cpuinfo shows cache is only @ 4096kb According to intel this should have 12MB of "smart cache". Doing searched for E5620 and CPUinfo shows the correct number: cache size : 12288 KB However mine shows this: processor : 15 v endor_id : GenuineIntel cpu family : 6 model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz stepping : 2 microcode : 0x1 cpu MHz : 2400.104 cache size : 4096 KB fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx bogomips : 4800.20 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual Any idea on why it shows like it's missing 8MB in CPU cache? .

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• DPM - Monitoring is green, Protection has error and Latest rec point is old. How do I interpret that?

  - by LosManos

  How do I read the DPM info in this case? Monitoring says Failed but Protection shows Ok while having a Latest recovery point from last year. Under Monitoring tab I have Failed for Source | Computer | Protection group | Start time Computer\System Protection | MyServerName | Recovery point | 2014-06-09 19:00:00 which shows me that something happened last night. But under Protection tab everything is green. Here I have Protection group member | | Protection status Protection group ..name.. Computer: MyServerName Computer\System protection Bare metal recovery OK ... Latest recovery point: 2013-12-12 06:32:54 My guess is that backup failed last night once, but succeeded later. It then found out that there hasn't been any change since sometime last year and leave it be and flags Ok.

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• Extracting httpdocs from Plesk Panel 9.5.4 Webserver backup file

  - by Paddington

  Good day, I am having problems manually extracting domains from Plesk 9.5 backup that was FTPed onto my back up server. I have followed the article http://kb.parallels.com/en/1757 using method 2. The problem is here: zcat DUMP_FILE.gz DUMP_FILE My backup file CP_1204131759.tar is a tar archive and zcat does not work with it. So I proceed to run the command: cat CP_1204131759.tar CP_1204131759. But when I try # cat CP_1204131759 | munpack I get an error that munpack did not find anything to read from standard input. I went on to extract the tar backup file using the xvf flags and got a lot of files (20) similar to these ones: CP_sapp-distrib.7686-0_1204131759.tgz CP_sapp-distrib.7686-35_1204131759.tgz CP_sapp-distrib.7686-6_1204131759.tgz How best can I extract the httpdocs of a domain from this server wide Plesk 9.5.4 backup?

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• Ubuntu 10.10 and Windows 7 (TrueCrypt) Multi-boot Problems

  - by Samuel Taylor

  I have now been searching days for a solution but have found nothing. I have Ubuntu 10.10 and Windows 7 with TrueCrypt as a multi-boot. It was working fine for a few weeks until I needed to reinstall Ubuntu. If I have the boot flag on the partition where Windows 7 is install (This is where the boot flags was when working before.), it boots fine in to Windows 7 but when pressing Esc it can't find grub2. If I have the boot flag on the partition where Ubuntu is install, it boots fine in to Ubuntu (by pressing Esc or typing the password) but unable to access Windows. I have tried reinstalling TrueCrypt Boot loader and repairing the header but it have no affect. My Partitions: sda1 - Windows 7 Recovery (GRUB2) sda2 - Windows 7 (TrueCrypt Boot Loader) sda3 - Ubuntu 10.10 (/) sda4 - Extended sda5 - Swap sda6 - Ubuntu (/home) Does anyone have any ideas? Thanks Sam

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• rsync to ONLY keep files in destination that have been removed from source

  - by David Corley

  We use rsync to copy filesystem contents from one machine to another as a backup. We first run MACHINE-X-MACHINE-Y rsync for a straight backup with the --delete and --delete-excluded switches We also run an internal Rsync between the MACHINE-Y destination, and another folder on MACHINE-Y with either of the delete flags. This maintains a non-destructive copy in the event someone inadvertently deletes a file on MACHINE-X. However, it also has the overhead of being a complete copy of what has already been synchronized. Ideally I want to be able to run the non-destructive rsync in such a way that the destination ONLY receives the deleted files and so avoids unnecessary duplication . Is there any way to do this?

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• LXC Container Networking

  - by digitaladdictions

  I just started to experiment with LXC containers. I was able to create a container and start it up but I cannot get dhcp to assign the container an IP address. If I assign a static address the container can ping the host IP but not outside the host IP. The host is CentOS 6.5 and the guest is Ubuntu 14.04LTS. I used the template downloaded by lxc-create -t download -n cn-01 command. If I am trying to get an IP address on the same subnet as the host I don't believe I should need the IP tables rule for masquerading but I added it anyways. Same with IP forwarding. I compiled LXC by hand from the following source https://linuxcontainers.org/downloads/lxc-1.0.4.tar.gz Host Operating System Version #> cat /etc/redhat-release CentOS release 6.5 (Final) #> uname -a Linux localhost.localdomain 2.6.32-431.20.3.el6.x86_64 #1 SMP Thu Jun 19 21:14:45 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux Container Config #> cat /usr/local/var/lib/lxc/cn-01/config # Template used to create this container: /usr/local/share/lxc/templates/lxc-download # Parameters passed to the template: # For additional config options, please look at lxc.container.conf(5) # Distribution configuration lxc.include = /usr/local/share/lxc/config/ubuntu.common.conf lxc.arch = x86_64 # Container specific configuration lxc.rootfs = /usr/local/var/lib/lxc/cn-01/rootfs lxc.utsname = cn-01 # Network configuration lxc.network.type = veth lxc.network.flags = up lxc.network.link = br0 LXC default.confu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:12:30:f2 brd ff:ff:ff:ff:f #> cat /usr/local/etc/lxc/default.conf lxc.network.type = veth lxc.network.link = br0 lxc.network.flags = up #> lxc-checkconfig Kernel configuration not found at /proc/config.gz; searching... Kernel configuration found at /boot/config-2.6.32-431.20.3.el6.x86_64 --- Namespaces --- Namespaces: enabled Utsname namespace: enabled Ipc namespace: enabled Pid namespace: enabled User namespace: enabled Network namespace: enabled Multiple /dev/pts instances: enabled --- Control groups --- Cgroup: enabled Cgroup namespace: enabled Cgroup device: enabled Cgroup sched: enabled Cgroup cpu account: enabled Cgroup memory controller: /usr/local/bin/lxc-checkconfig: line 103: [: too many arguments enabled Cgroup cpuset: enabled --- Misc --- Veth pair device: enabled Macvlan: enabled Vlan: enabled File capabilities: /usr/local/bin/lxc-checkconfig: line 118: [: -gt: unary operator expected Note : Before booting a new kernel, you can check its configuration usage : CONFIG=/path/to/config /usr/local/bin/lxc-checkconfig Network Config (HOST) #> cat /etc/sysconfig/network-scripts/ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=dhcp ONBOOT=yes #> cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 ONBOOT=yes TYPE=Ethernet IPV6INIT=no USERCTL=no BRIDGE=br0 #> cat /etc/networks default 0.0.0.0 loopback 127.0.0.0 link-local 169.254.0.0 #> ip a s 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:12:30:f2 brd ff:ff:ff:ff:ff:ff inet6 fe80::20c:29ff:fe12:30f2/64 scope link valid_lft forever preferred_lft forever 3: pan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether 42:7e:43:b3:61:c5 brd ff:ff:ff:ff:ff:ff 4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 00:0c:29:12:30:f2 brd ff:ff:ff:ff:ff:ff inet 10.60.70.121/24 brd 10.60.70.255 scope global br0 inet6 fe80::20c:29ff:fe12:30f2/64 scope link valid_lft forever preferred_lft forever 12: vethT6BGL2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether fe:a1:69:af:50:17 brd ff:ff:ff:ff:ff:ff inet6 fe80::fca1:69ff:feaf:5017/64 scope link valid_lft forever preferred_lft forever #> brctl show bridge name bridge id STP enabled interfaces br0 8000.000c291230f2 no eth0 vethT6BGL2 pan0 8000.000000000000 no #> cat /proc/sys/net/ipv4/ip_forward 1 # Generated by iptables-save v1.4.7 on Fri Jul 11 15:11:36 2014 *nat :PREROUTING ACCEPT [34:6287] :POSTROUTING ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE COMMIT # Completed on Fri Jul 11 15:11:36 2014 Network Config (Container) #> cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp #> ip a s 11: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 02:69:fb:42:ee:d7 brd ff:ff:ff:ff:ff:ff inet6 fe80::69:fbff:fe42:eed7/64 scope link valid_lft forever preferred_lft forever 13: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever

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• ffmpeg error while segmenting

  - by Tommy Ng

  I'm using ffmpeg and segmenter on Ubuntu 10.04 to create the transport stream from flv/h264 video files and then segment the ts segments for ipad streaming. Some ts files show an error with segmenter - Output #0, mpegts, to '29': Stream #0.0: Video: 0x0000, yuv420p, 480x360, q=2-31, 90k tbn, 25 tbc Stream #0.1: Audio: 0x0000, 0 channels, s16 [mpegts @ 0x11f4ac0]sample rate not set Could not write mpegts header to first output file my ffmpeg command for creating the ts file - ffmpeg -i 1.flv -f mpegts -acodec libfaac -ar 48000 -ab 64k -s 480x360 -vcodec libx264 -b 192k -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate 192k -bufsize 192k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -aspect 480:360 -g 30 -async 2 -y 1.ts my segmenter command - segmenter 1.ts 10 1 1.m3u8 path/to/streams/

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• Where to set java heap options (e.g. -Xmx) for Tomcat 6 under Ubuntu 9.04?

  - by Chris

  I'm running Tomcat using the tomcat6 package from Ubuntu 9.04, which makes a daemon out of Tomcat using jsvc. I'd like to know the proper way to set Java heap options like -Xmx for Tomcat. I'd like to put the configuration wherever is most stylistically correct, and wherever is least likely to be overwritten by Ubuntu package updates. The options I see right now: Hard-code them somewhere in /etc/init.d/tomcat6. Hard-code them somewhere in /usr/share/tomcat6/bin/catalina.sh. Create a line in /usr/share/tomcat6/bin/startup.sh to set CATALINA_OPTS to have the desired flags, and then export CATALINA_OPTS as an environment variable. (This looks like it will get picked up by catalina.sh.) The last option sounds like the best one, and it's advocated (without explanation of why) at http://serverfault.com/questions/121038/increasing-javas-heapspace-in-tomcat-startup-script. But I wanted to get a second opinion. Anyone want to confirm that there isn't a better way?

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• Filtering ToDo List in Outlook 2010 with multiple Exchange accounts

  - by David LaRocque

  I'm trying to figure out how to get the ToDo list filtered for just one account? I've tried customizing the view, and using the advanced filter to get just one Oulook Data file, but once I do that the filter goes bonkers and I get all sorts of results! I know it's a combination of email flags and true tasks, and tried combining filters to pull those conditions together, and simply can't get it to cooperate. Before 2010, when the only way to get multiple mailboxes was to add additional mailboxes to the primary account, the task list pulled from just the primary account - but of course, the secondary accounts are not cached and available offline.

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• Partition and mount my secondary hard drive on CentOS 5.5 64bit?

  - by Andrew Fashion

  I am trying to prepare my second hard drive for user image uploads. Here is the current layout: # sudo parted /dev/sda print Model: ATA WDC WD2500KS-00M (scsi) Disk /dev/sda: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 8595MB 8488MB primary linux-swap 3 8595MB 10.7GB 2147MB primary ext3 4 10.7GB 250GB 239GB extended 5 10.7GB 250GB 239GB logical ext3 Information: Don't forget to update /etc/fstab, if necessary. I am assuming #4 is my secondary drive? How do I partition and mount it so I can begin using it? And how do I add to fstab? I understand if it's to many questions in one, just help me with whatever you can I guess :) Thank you for any help!

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• Cant remove/delete symlink

  - by user477519

  I have tried to create a symlink and it threw this error: ln: accessing `.test': Permission denied Now I can't unlink or delete the symlink file. Tried Googling for help but could not find a solution. Please find the results of following commands. stat .test : File: `.test'stat: cannot read symbolic link `.test': Permission denied Size: 26 Blocks: 0 IO Block: 16384 symbolic link Device: 1fh/31d Inode: 312075453 Links: 1 Access: (0777/lrwxrwxrwx) Uid: (11160/ chatt) Gid: (11307/ pgr) Access: 2012-11-12 11:36:51.167327500 +0000 Modify: 2012-11-12 11:36:51.163331700 +0000 Change: 2012-11-12 11:36:51.163331700 +0000 Birth: - chattr -i .test: chattr: Permission denied while trying to stat .test lsatter .test lsattr: Operation not supported While reading flags on .test Any help would be appreciated. Thanks

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• Linux- passwordless ssh from system (root) script

  - by redmoskito

  What's the easiest way to have a system script (running as root) execute remote commands over ssh? I've written some scripts that execute commands remotely via ssh, and they work great when I run them as myself, as I've set up ssh-agent and keys for passwordless login. I'd like to call these when my laptop docks and undocks. I've been successful at running arbitrary scripts when docking/undocking, but since the ACPI event scripts run as root, trying to run my ssh script fails during authentication. I tried using sudo with the -u and -i flags to simulate running the script as my user, e.g.: sudo -u redmoskito -i /home/redmoskito/bin/remote_command which successfully finds my private key and tries to use it, but the ssh-agent credentials are still missing, so it still needs my passphrase.

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• How to turn on/turn off leds by terminal?

  - by GarouDan

  I would like turn on/turn off some of my leds running a command on linux. I use Ubuntu 12.04 LTS. I tried xset led named "Scroll Lock" xset led named "Num Lock" xset led 2 (this is the number of Scroll Lock as `xset q` says) xset led 1 but nothing works. Tried setleds +num setleds +scroll but I got a error message saying Error reading the current settings of flags. Maybe you're not on the console? (I was in a terminal). So, how can I perform this?

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• Change MacOS X guest screen resolution for VirtualBox

  - by Pymoo

  I have tried all alternatives and resources that I found on internet to achieve to change screen resolution in my MacOS X guest. I have the latest VirtualBox version (4.1.22) and I have MacOS X 10.6.3 Snow Leopard running in a vm guest. Some solutions that don't work for me are: Tuning virtual machine settings: Adding and in the .vbox file, or running these two commands: vboxmanage setextradata "MAC OS X" "CustomVideoMode1" "1360x768x32" vboxmanage setextradata "MAC OS X" "GUI/CustomVideoMode1" "1360x768x32" Editing Guest OS boot configuration: Modify /Library/Preferences/SystemConfiguration/com.apple.boot.plist with these lines: <key>Kernel Flags</key> <string>"Graphics Mode"="1360x768x32"</string> <key>Graphics Mode</key> <string>1360x768x32</string> Any other suggestion, something that I was missing. Thanks in advance,

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• Spambot Infection Detection

  - by crankshaft

  My server has been blocked by CBL for participating in curtwail spambot. Initially we suspected that it was coming from a PC and not from the server, but the router is blocking all packets on 25 except those coming from the server. I have just executed the tcpdump command and every 5 minutes I see a flurry of activity on port 25 that is very suspicious and I am sure that there is some process running on the server: 13:02:30.027436 IP exprod5og110.obsmtp.com.53803 > ubuntu.local.smtp: Flags [S], seq 171708781, win 5744, options [mss 1436,sackOK,TS val 3046699707 ecr 0,nop,wscale 2], length 0 I have stopped postfix, and yet there is still traffic on port 25 above. But how can I find what process is actually communicating on port 25 as it only rund for a few seconds and so for example lsof -i :25 will never catch it. I have been working on this now for 2 days, it is a live server and I cannot simply shut it down, any suggestion on how I can detect the source of this email bot process ?

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