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  • Extract part of a image from a big image

    - by rajat
    I have a 6 images , and each image has a certain section that i want to save as a separate image , the problem is that it has to be accurate because i am doing some animation using the sub-image so they should exactly . so I want to accurately extract a that part from each of the 6 images , i can't do it using a image editor in which i have to make the bounding box myself because it will not be accurate , is there any program that lets me do this by like defining a box using numerical values. PS: I don't want to write matlab or opencv program for this .

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  • Can't add Samba users in Ubuntu

    - by petersohn
    I am using (K)Ubuntu 10.10, and I'm trying to set up Samba shares. When I try to add a Samba user in the KDE samba configuration, exit the configuration dialog, then enter it again, I see that the user is not added. Then I tried it using the command line (running as root): smbpasswd -a peet 'peet' is my normal user name. It asks for a password, then does something on my hard drive, but I can see no password file created in /etc/samba, and neither does the date of my smb.conf file change. I also don't see the samba user when I open the samba configuration dialog.

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  • Yum install packages to an alternate directory, without chroot?

    - by Stefan Lasiewski
    I would like to use the Foswiki yum repository to install Foswiki (296 packages). The default installation path is /var/lib/, but I want to install it to an alternate location at /opt/www/. In the future, I still want to use yum to check for and apply updates to the packages. Is it possible to use yum to install packages to an location which is different then the default location provided by RPMs? Does Yum provide anything similar to ./configure --prefix=/usr/local/ or rpm --install --prefix=/opt/local? Yum provides the --installroot option, but that appears to primarily for chroot environments.

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  • NIC is receiving, but not transmitting at all?

    - by Shtééf
    I'm trying to fix a very strange problem remotely on a machine at a customer site. The machine is a Dell PowerEdge, I believe a 1950 (haven't verified, but the lspci output matches specs I found.) The machine has two similar NICs, identified as Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet (rev 12) by lspci, and using the bnx2 driver. (I suspect these are on-board and on the same controller, which is what I'm accustomed to for this type of machine.) The primary interface eth0 works perfectly, and is in fact how I am ssh'd in. However, the secondary interface eth1 is not transmitting. I can see this in ifconfig output, for example, where the TX field is always 0. However, it is receiving, and tcpdump shows ARP requests coming from the ISP's gateway on the other side. The interface is physically connected to a Siemens BSTU4 modem, configured by the ISP. The link is properly set to 10MBps and full duplex, without negotation, as the ISP requested. A small /30 subnet is configured. For the sake of anonimity, let's say the machine is 3.3.3.2/30, and the ISP's gateway .1. The machine has no firewall settings whatsoever. Even running something like arping -I eth1 3.3.3.1, and running tcpdump alongside, shows no traffic whatsoever being transmitted on the interface. (But the other side keeps steadily sending ARP requests, and that is all that can be seen.) What could be causing this? Here's some output, anonymized, which may hopefully help: $ ethtool eth1 Settings for eth1: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: Not reported Advertised auto-negotiation: No Speed: 10Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: off Supports Wake-on: d Wake-on: d Link detected: yes $ ip link show eth1 3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:15:c5:xx:xx:xx brd ff:ff:ff:ff:ff:ff $ ip -4 addr show eth1 3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000 inet 3.3.3.2/30 brd 3.3.3.3 scope global eth1 $ ip -4 route show match 3.3.3.0/30 3.3.3.0/30 dev eth1 proto kernel scope link src 3.3.3.2 default via 10.0.0.5 dev eth0

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  • Routing table with two NIC adapters in libvirt/KVM

    - by lzap
    I created a virtual NAT network (192.168.100.0/24 network) in my libvirt and new guest with two interfaces - one in this network, one as bridged (10.34.1.0/24 network) to the local LAN. The reason for that is I need to have my own virtual network for my DHCP/TFTP/DNS testing and still want to access my guest externally from my LAN. On both networks I have working DHCP, both giving them IP addresses. When I setup NAT port forwarding (e.g. for ssh), I can connect to the eth0 (virtual network), everything is fine. But when I try to access the eth1 via bridged interface, I have no response. I guess I have problem with my routing table - outgoing packets are routed to the virtual NAT network (which has access to the machine I am connecting from - I can ping it). But I am not sure if this setup is correct. I think I need to add something to my routing table. # ifconfig eth0 Link encap:Ethernet HWaddr 52:54:00:B4:A7:5F inet addr:192.168.100.14 Bcast:192.168.100.255 Mask:255.255.255.0 inet6 addr: fe80::5054:ff:feb4:a75f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:16468 errors:0 dropped:27 overruns:0 frame:0 TX packets:6081 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:22066140 (21.0 MiB) TX bytes:483249 (471.9 KiB) Interrupt:11 Base address:0x2000 eth1 Link encap:Ethernet HWaddr 52:54:00:DE:16:21 inet addr:10.34.1.111 Bcast:10.34.1.255 Mask:255.255.255.0 inet6 addr: fe80::5054:ff:fede:1621/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:34 errors:0 dropped:0 overruns:0 frame:0 TX packets:189 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4911 (4.7 KiB) TX bytes:9 # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.34.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1003 0 0 eth1 0.0.0.0 192.168.100.1 0.0.0.0 UG 0 0 0 eth0 Network I am trying to connect from is different than network the hypervisor is connected to: 10.36.0.0. But it is accessible from that network. So I tried to add new route rule: route add -net 10.36.0.0 netmask 255.255.0.0 dev eth1 And it is not working. I thought setting correct interface would be sufficient. What is needed to get my packets coming through?

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  • Convert Ubuntu 10.04 into a server?

    - by letseatfood
    Hello, I have Ubuntu 10.04 Lucid Lynx Desktop version installed and am interested in running it as a server. I have already installed Apache, PHP, and MySQL. I am completely new to server administration. Would somebody please point me in a good direction to setting this up? I am sure there are numerous tutorials online, but I just can't seem to find one. Thanks!

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  • some novice questions about VPS

    - by Camran
    I have ordered a VPS today, and I am still setting it up. I have some Q though: Also, I have just installed apache, php and mysql. 1- I don't understand which folder my website should be in. Is it the 'www' folder or the htdocs folder I should upload my site to? Because they are in entirely different directories. 2- How do I even upload files? FTP program? How do I install one, and which one? Thanks

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  • IPtables Traffic Quota - up and down

    - by Nick
    I've been trying to set up traffic quotas for users on a shared server and i believe [with my limited knowledge] that iptables --quota and ports which have been selected for each user [--dport] is the way to do this... iptables -A OUTPUT --dport 1,2,3,4... --quota 123412341234 -j ACCEPT iptables -A OUTPUT --dport 1,2,3,4... -j DROP I think something like this would work to limit the traffic [and reset every month] but its only for traffic going out. Is there something I could do to combine -A OUTPUT and -A INPUT into one quota? Or, is there a different method I could use to achieve the same thing more efficiently? OS is debian squeeze Thanks.

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  • Is CSF overkill?

    - by A4J
    My server runs just my own sites (vBulletin forums - which are always patched with security fixes) and Rails sites using the latest version) so do I really need CSF? (http://configserver.com/cp/csf.html) Or is it unnecessary for this kind of server set-up? I have already done the usual (disable SSH login, pub-key auth, very strong passwords everywhere else etc) It was often recommended by users over at the cPanel forums - but I guess most of them are hosts there.

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  • mdadm - Recovering a 'split' RAID1 array

    - by Hamza
    I have two drives that used to be part of a single RAID1 volume but it appears that one of them went offline for some time, something I've noticed just now when I rebooted my system. I now seem to have two RAID volumes, as reported by: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md126 : active raid1 sdc[1] 2096116 blocks super 1.2 [2/1] [_U] md127 : active (auto-read-only) raid1 sdb[0] 2096116 blocks super 1.2 [2/1] [U_] unused devices: <none> Not exactly sure where to go from here. How can I merge and re-sync these volumes without data loss? Thanks.

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  • SSH issues: Read from socket failed: Connection reset by peer

    - by nitins
    I compiled OpenSSH_6.6p1 on one of our server. I am able login via SSH to the upgraded server. But I am not able to connect to other servers running OpenSSH_6.6p1 or OpenSSH_5.8 from this. While connecting I am getting an error as below. Read from socket failed: Connection reset by peer On the destination server in the logs, I am seeing it as below. sshd: fatal: Read from socket failed: Connection reset by peer [preauth] I tried specifying the cipher_spec [ ssh -c aes128-ctr destination-server ] as mentioned in here and was able to connect. How can configure ssh to use the cipher by default? Why is the cipher required here?

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  • Encrypt EC2 API call

    - by Frank
    I have to host an AMI in the Amazon Marketplace. i need to get the type of instance, whenever some user launches the AMI., like if its small medium or large. based on that i need to make some changes in the AMI when its created. I can do this with Amazon API call, to get the instance type, but the problem is that the instances created with the AMI will be started by other users, and i cannot use my AWS Credentials in the Amazon API. Is there any way that i can create an anonymous readonly user to make only specific type of EC2 API Calls? Or can i encrypt my EC2 API credentials, so no one can use it?

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  • Samba does not reload user group members

    - by xato
    I am running a simple samba server setup where users connect to a share which contains folders for specific user groups. The folders are chmod 2770, so only users which are in the correct group can read/write in them. The problem is that if I change group memberships (i.e. remove user from group / add user to group; changes are in sync between clients and server!) samba does not automatically reload the group memberships for the user, so they can still write to groups that they are no longer a member of etc. I either have to reconnect to the share or to restart samba to apply the changes. Is there any way to prevent group caching and/or enable group membership reload in samba? My smb.conf: https://gist.github.com/anonymous/ca7c10a3b3e2168d7a03

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  • How to connect with MySQL server if it won't connect via the socket?

    - by cwd
    I have an account on a shared server. I have jailshell access and also PhpMyAdmin. I want to run mysql commands via SSH but I'm getting an error: $ mysql -u mySqlUser -p mySqlPw Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' I can connect with PHP and phpMyAdmin, so would it be possible to call mysql from the shell and have it connect via an ip and port instead of the socket? The file /var/lib/mysql/mysql.sock does not exist - maybe that is intentional, and the only thing in /etc/my.cnf is [mysqld] skip-innodb More Info I don't have access to change system settings. I did a search in /var for mysql.sock but found nothing. However, phpMyAdmin might be connecting via a socket somehow: Really it would just be great if I could connect via IP. Also tried these two syntaxes: $ mysql -u mySqlUser -p mySqlPw -h localhost $ mysql -u mySqlUser -p mySqlPw -h localhost -P 3306 Both with the same result: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

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  • Connect through SSH and type in password automatically, without using a public key

    - by binary255
    A server allows SSH connections, but not using public key authentication. It's not within my power to change this at the moment (due to technical difficulties, not organizational) but I will get on it as soon as possible! What I need now is to execute commands on the server using plain old account+password authentication from a script. That is, I need to do it in a non-interactive way. Is it possible? And how do I do it? The client which will be executing the script runs Ubuntu Server 8.04. The server runs Cygwin and OpenSSH.

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  • How to force rsync to use destination directory as root

    - by thepurplepixel
    I have a simple script to one-way-sync files/folders within a directory: #!/bin/bash HOST='<hostname>' USER='<username>' DIR='/downloads/' SOURCE='/srv/torrents' rsync -e "ssh -l $USER" --remove-source-files -h -4 -r --stats --progress -i $SOURCE $HOST:$DIR find $SOURCE -type d -empty -prune -exec rmdir -p \{\} \; However, when this rsync operation runs, it creates a folder, torrents in /downloads on the destination machine. How can I force rsync to put all folders & files from /srv/torrents (remote) into /downloads/ (local) instead of creating /downloads/torrents as a separate directory?

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  • dhclient append settings from multiple DHCP servers

    - by Brian
    I have a server with two interfaces connected to two separate networks, using DHCP for both. When dhclient is writing /etc/resolv.conf, I would like it to append settings that aren't already there. For instance, if I receive from one DHCP server: nameserver 10.0.0.1 search one.mydomain.com and from another: nameserver 10.1.1.254 search two.mydomain.com Then resolv.conf should look like this: search one.mydomain.com two.mydomain.com nameserver 10.0.0.1 nameserver 10.1.1.254 At the moment, it seems the last dhclient overwrites whatever was there. I know I can preconfigure settings in dhclient.conf using supercede or append, but then I have to hard-code the values. I've scoured the man page for dhclient, but it seems like dhclient prefers to work alone (i.e. not in conjunction with any other dhclients)...or am I missing something?

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  • SSH stops at "using username" with IPTables in effect

    - by Rautamiekka
    We used UFW but couldn't make the Source Dedicated ports open, which was weird, so we purged UFW and switched to IPTables, using Webmin to configure. If the inbound chain is on DENY and SSH port open [judged from Webmin], PuTTY will say using username "root" and stops at that instead of asking for public key pw. Inbound chain on ACCEPT the pw is asked. This problem didn't happen with UFW. Picture of IPTables configuration in Webmin: http://s284544448.onlinehome.us/public/PlusLINE%20Dedicated%20Server,%20Webmin,%20IPTables,%200.jpgThe address is to the previous rautamiekka.org. iptables-save when on INPUT DENY: # Generated by iptables-save v1.4.8 on Wed Apr 11 16:09:20 2012 *mangle :PREROUTING ACCEPT [1430:156843] :INPUT ACCEPT [1430:156843] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1415:781598] :POSTROUTING ACCEPT [1415:781598] COMMIT # Completed on Wed Apr 11 16:09:20 2012 # Generated by iptables-save v1.4.8 on Wed Apr 11 16:09:20 2012 *nat :PREROUTING ACCEPT [2:104] :POSTROUTING ACCEPT [0:0] :OUTPUT ACCEPT [0:0] COMMIT # Completed on Wed Apr 11 16:09:20 2012 # Generated by iptables-save v1.4.8 on Wed Apr 11 16:09:20 2012 *filter :INPUT DROP [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1247:708906] -A INPUT -i lo -m comment --comment "Machine-within traffic - always allowed" -j ACCEPT -A INPUT -p tcp -m comment --comment "Services - TCP" -m tcp -m multiport --dports 22,80,443,10000,20,21 -m state --state NEW,ESTABLISHED -j ACCEPT -A INPUT -p tcp -m comment --comment "Minecraft - TCP" -m tcp --dport 25565 -j ACCEPT -A INPUT -p udp -m comment --comment "Minecraft - UDP" -m udp --dport 25565 -j ACCEPT -A INPUT -p tcp -m comment --comment "Source Dedicated - TCP" -m tcp --dport 27015 -j ACCEPT -A INPUT -p udp -m comment --comment "Source Dedicated - UDP" -m udp -m multiport --dports 4380,27000:27030 -j ACCEPT -A INPUT -p udp -m comment --comment "TS3 - UDP - main port" -m udp --dport 9987 -j ACCEPT -A INPUT -p tcp -m comment --comment "TS3 - TCP - ServerQuery" -m tcp --dport 10011 -j ACCEPT -A OUTPUT -o lo -m comment --comment "Machine-within traffic - always allowed" -j ACCEPT COMMIT # Completed on Wed Apr 11 16:09:20 2012 iptables --list when on INPUT DENY: Chain INPUT (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere /* Machine-within traffic - always allowed */ ACCEPT tcp -- anywhere anywhere /* Services - TCP */ tcp multiport dports ssh,www,https,webmin,ftp-data,ftp state NEW,ESTABLISHED ACCEPT tcp -- anywhere anywhere /* Minecraft - TCP */ tcp dpt:25565 ACCEPT udp -- anywhere anywhere /* Minecraft - UDP */ udp dpt:25565 ACCEPT tcp -- anywhere anywhere /* Source Dedicated - TCP */ tcp dpt:27015 ACCEPT udp -- anywhere anywhere /* Source Dedicated - UDP */ udp multiport dports 4380,27000:27030 ACCEPT udp -- anywhere anywhere /* TS3 - UDP - main port */ udp dpt:9987 ACCEPT tcp -- anywhere anywhere /* TS3 - TCP - ServerQuery */ tcp dpt:10011 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere /* Machine-within traffic - always allowed */ The UFW rules prior to purging on INPUT DENY: 127.0.0.1 ALLOW IN 127.0.0.1 3306 DENY IN Anywhere 20,21/tcp ALLOW IN Anywhere 22/tcp (OpenSSH) ALLOW IN Anywhere 80/tcp ALLOW IN Anywhere 443/tcp ALLOW IN Anywhere 989 ALLOW IN Anywhere 990 ALLOW IN Anywhere 8075/tcp ALLOW IN Anywhere 9987/udp ALLOW IN Anywhere 10000/tcp ALLOW IN Anywhere 10011/tcp ALLOW IN Anywhere 25565/tcp ALLOW IN Anywhere 27000:27030/tcp ALLOW IN Anywhere 4380/udp ALLOW IN Anywhere 27014:27050/tcp ALLOW IN Anywhere 30033/tcp ALLOW IN Anywhere

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  • How do I limit concurrent sftp / port forwarding logins

    - by Kyoku
    I have ssh set up so my users can only access sftp and port forwarding, how can I limit the number of concurrent logins on a per user basis? In my sshd_config I have UsePAM set to yes and in /etc/security/limits.conf I have: username - maxlogins 1 I also tried: username hard maxlogins 1 Neither of these works and the users can still log in multiple times.

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  • Remote Program (via ssh) suspends when leaving client computer

    - by Philipp F
    I'm working with MATLAB on a remote computer logging in via ssh -X remotepc and running matlab like matlab &. When I start a long-running process and leave the computer, it seems to suspend the process (after like 30mins being away) such that there is nearly no progress over night. As soon as I come back and wake up the client, the remote process continues with the calculation. I can see this from the load-average values (uptime) Why is that and how can I change this behaviour?

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  • Skip kernel module at boot

    - by Gris
    Hello. There is a broken kernel module, due to which I can not even load the OS, so I can not delete or fix it. Is it possible to skip this module at boot, using the kernel's parameters or something? Thanks.

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