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• Unable to open websites that use HTTPS on linux

  - by negai

  I have the following network configuration: My PC 192.168.1.20/24 uses 192.168.1.1/24 as a gateway. Dlink-2760U router with Local address 192.168.1.1/24 has a VPN connection open with the provider using PPTP. Whenever I'm trying to open some web-sites that has some authorization (e.g. gmail.com, coursera.org), I'm getting a request timeout. This problem is observed mostly on linux (Ubuntu 12.04 and Debian 6.0), while most of such websites work correctly on windows XP. Could you please help me diagnose the problem? Could it be related to NAT + HTTPS? Thanks

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• set a global environment variable in linux that sticks when going root

  - by Scott

  When I SSH into a linux box, I want to have the /etc/profile file save the results of the whoami command to a global environment variable. if I were to go root with the command sudo su -, I do not want that command to run again when gonig root, I want it to stick with the result of whoami as my regular username from before I went root, and I need to access that variable as the root user even though it will run the /etc/profile file again when I go root. What can I do to only run that command once in the /etc/profile command?

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• Best way to partition 1 TB (Linux and Windows 7)

  - by Simon

  Is there an intelligent way to partition 1 TB and be prepared for resizing/adding/deleting partitions? I was thinking about LVM, but as far as I remember, Windows 7 can't be installed on logical volume right? For now my plan is: - ~150 GB for Windows 7 and other stuff (Visual Studio..., maybe I'll split it 100/50 or something like that) - simple NTFS - 850 GB = LVM - disk for Linux (Ubuntu) and other stuff virtual machines, etc. I'm mostly interested in how and what tools should I use to get easy in maintain partitions for both systems.

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• about Linux read/write only permissions

  - by Bimal

  My question looks similar to another thread: Linux directory permissions read write but not delete Here, I want to create a directory where I can give the permissions like: A user can create/upload any files. A user can re-upload and overwrite the files. A user cannot remove the file anymore. I am on CentOS 5.5, basic user only. How can I do that? Or is there any third party software that can be installed to do this? Or, create a new process which will lock the permissions right after a new file is uploaded via ssh?

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• linux system problem

  - by snakec

  very first thanks to u all for Ur support. I'm quite new to Linux .i know how to install software but i don't know 1: how to install library .a or .so files i: how to install tar.gz i use the method like ./configure. make make install but most of the time i got the message nothing to make .in lots of tar.gz there is no installation document no make file no .configure file that make me quite confused how to install them or run them now i got sample source code of cuda i got them in tar.gz form when i extract them i found a folder in folder i found folder like c ,doc,shared etc when i open each folder i found more folder n file like that src, doc common ,lib, in these folder i found source code file header files libraries file make files i don't know how to run this kind of project can the be installed on the system how to run them they don't have .run file or script they don't have configure file can any one explain me how to compile them ,how to run them & how to install them

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• why run a Linux shell command with &?

  - by George2

  I am using Red Hat Linux Enterprise version 5. Sometimes I notice people run command with a couple of & options. For example, in the below command, there are two &-signs. What are the function of them? Are they always used together with nohup? nohup foo.sh <parameters to specific the scripe> >& <log_file_name> & thanks in advance, George

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• Syncronize Linux /etc/ directory

  - by entend

  I have virtual machine with Linux (Ubuntu server) which is used as prototype for other machines. Sometimes I make changes in prototype system and want to import this changes at some other machine. I know about Puppet, cfengine and FAI but want something easy for example rsync script which will work through ssh when it needed. Main goal is /etc/ directory. But I don't want to syncronize some private files for example /etc/passwd /etc/shadow and so on. I don't know all of it. Are there tips for my task ? May be someone have such rsync script.

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• Best linux distribution for Java build server & ...

  - by ashkanr

  Hi all, we are trying to setup a build server for building our Java projects. Following software will be installed: * Subversion * Jira/Confluence/Crucible/Fisheye ... * Bamboo (continuous integration solution) I have 2 questions: 1. Which dist of linux is better suited in your opinion? Our current candidates are: openSUSE, CentOS, Gentoo, Mandriva. 2. Is it possible to build something like an image after finishing setup process and burn it on hard drive for next customers without need to repeat all installation and config process? Thanks in advance,

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• Queue emails under linux

  - by md1337

  I have a slow distant mail relay server and a web application I'm using locks up when sending e-mails to that distant mail server, until the e-mail is sent. After the e-mail is sent the page comes back and the application is snappy again. SO I'm trying to set up a differed mail queue locally on the application server (linux) so that the application uses that instead of the distant mail server. My rationale is that e-mails would get queued up locally until they are processed by the distant mail server, but at least the application doesn't lock up. I have installed postfix and set up the relayhost setting to the distant mail server, but performance has not improved. What appears to happen is that postfix just forwards my SMTP instructions in real time and doesn't really queue them? What can I do? Thanks!

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• Sync Linux to Windows 2003/2008 Natively

  - by user26753

  Without using any external packages for Windows, can Linux synchronise it's clock to a Windows 03/08 Server natively? I've tried it using various NTP packages for Windows but would like to use just Windows software for this. EDIT: I've tried the below however it doesn't work. I've put TimeSource in /etc/hosts, stated server TimeSource in /etc/ntp.conf however when I do a service ntpd start it doesn't sync (it's 3 minutes out at the minute). I then stopped the NTPD and did a ntpdate TimeSource, thinking it would sync and then I'd start the NTPD once it's got the time, and it says: no server suitable for synchronization found. Though I can ping it. Any thoughts?

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• Tricking Linux apps about current time with environment variables

  - by geek

  Sometimes it is possible to trick a Linux app by calling it like this: HOME=/tmp/foo myapp This would make myapp think /tmp/foo is the home directory, it won't try to get the user id, find its home directory via getpwent(). This is useful when myapp must be forced to dump some of its config files into a non-standard location different than ~. A similar trick can be done like this: LANG=foo LC_ALL=bar myapp This is useful when myapp needs to be called once with a different locale without having to make the change persistent by using the export bash built-in or even modify stuff in /etc/profile. Is it possible to pull the same trick with time and date? The goal is to make an app use another time than the system ones. The final goal - to make timestamps that appear in logs/commit messages not being tied to the system time.

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• Editing files on linux server from windows

  - by celicni

  I want to edit text files on Linux server from Windows, using text editor like Notepad++ or UltraEdit. I've managed to do so using WinSCP. It can edit files remotely and offers me to choose local application to open those files. That is exactly what I need, but when I hit ctrl-s (not every time, in about 50% cases), it waits for around 10 seconds, alerts that connection has failed, and offers me to "abort". When I click abort, it instantly reconnect and save file. So does anybody knows any other way to edit files remotely without this annoying waiting period.

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• Linux/Solaris replace hostnames in files according to hostname rule

  - by yael

  According to the following Perl command ( this command part of ksh script ) I can replaced old hostnames with new hostnames in Linux or Solaris previos_machine_name=linux1a new_machine_name=Red_Hat_linux1a export previos_machine_name export new_machine_name . perl -i -pe 'next if /^ *#/; s/(\b|[[:^alnum:]])$ENV{previos_machine_name}(\b|[[:^alnum:]])/$1$ENV{new_machine_name}$2/g' file EXPLAIN: according to perl command - we not replaces hostnames on the follwoing case: RULE: [NUMBERS]||[letter]HOSTNAME[NUMBERS]||[letter] my question after I used the Perl command in order to replace all old hostnames with new hostnames based on the "RULE" in the Perl command how to verify that the old hostnames not exist in file ? for example previos_machine_name=linux1a new_machine_name=Red_Hat_linux1a more file AAARed_Hat_linux1a verification should be ignore from this line @Red_Hat_linux1a$ verification should be match this line P=Red_Hat_linux1a verification should be match this line XXXRed_Hat_linux1aZZZ verification should be ignore from this line . . . .

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• Back up Linux environment

  - by joesavage

  I'm currently in the process of installing a bunch of stuff I need and getting setup my Linode that I recently purchased. Being a Linux newbie, I'm doing pretty well - but one small mistake can screw everything up for me. I've currently got apache2 and some other things successfully installed and setup how I want them, and DO NOT want this to be ruined by some newbie mistake. What is the easiest way to backup the actual environment itself so that I can restore the backed up environment (with apache2 and things fully working) if I mess up?

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• Understanding RAM usage on Linux

  - by stebbo

  I'm completely new to Linux and I'm just trying to understand where all my RAM is going. I've got a pretty fresh install of Xubuntu running as a VMWare guest, and I've given it 1.5GB RAM to play with. After only running two apps starting up Tomcat servers and also running Firefox, I've got hardly anything left. 160MB according to free -m. Looking at the output from Top, I see Java appearing twice, each stealing about 1/2 Gig resident memory. Both Tomcat instances use the same jdk, I would have thought I'd only see Java there once. What's the story? I had a screenshot but unfortunately couldn't post it being under 10 rep. Update The free -m output requested: total used free shared buffers cached Mem: 1419 1380 39 0 8 111 -/+ buffers/cache: 1259 160 Swap: 509 68 441 Top (coming)

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• Best way to have linux setup for changing distros

  - by Wizard

  Hi there. I am currently using Fedora and looking at switching to Linux Mint Debian Edition. What is the best way to have the machine setup, so changing distro causes the least issues. In that I mean; people usually say having /home on it's own partition is good because then you just format the other partitions and you don't loose anything in home. However what happens then with say Evolution (or other program) configs etc with one version and then when you move to another distro it has other files, this could cause issues? Is there another way to have machine setup?

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• Wait for linux machine to be rebooted

  - by Theo

  I have a small script to install on my remote machine an update. I would like to reboot the machine remotely and if it is rebooted, continue with some more commands. What I currently do is: ssh root@myMachine << COMMANDS_ISSUED ###... Tasks init 6 COMMANDS_ISSUED sleep 180s ssh root@myMachine << POST_REBOOT_COMMANDS ###.... More stuff POST_REBOOT_COMMANDS Is there a more elegant way to do it? Like pinging the machine all 5 seconds up to a maximum of 4 minutes? I play with a few linux machines which have different boot up times and if my script would continue immediately after reboot, this could safe quite some time for me. (Note: I don't want to parallelize execution over all machines as I want to see for each machine if everything worked fine)

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• Connect a linux server to network and access it from another computer browser

  - by user1732451

  I had a server in a hosting company and I took it home. I need to connect him to a local network (not wifi) and access to the server from another computer in the network via browser, like I did it when it was in the hosting company. I don't have any knowledge in linux, I just know how to type in the command line :) I thinks all the IP configuration of the server is one big mess, because it passed from more then one hosting company to another... I tried a lot of tutorials that I found in the web, but nothing works - mainly because I don't know how to check if I did something wrong. I just need to know how to connect to local network ( D-Link router) and then access the server from another computer browser. thanks update: the server os is: CentOS release 4.8 (Final)

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• How to compare differences between directories (linux)

  - by Phil

  I have two directories - one from earlier backup and second from newest backup. How do i compare what changes were made to files in directory from newest backup on Linux? Also how do i display changes in for example text and php files - i'm thinking about something like revision history on wikipedia where you see old version on one side of the screen and newest version on other and changes are highlighted. How do i achieve something like that? edit: How do i also compare remote dir with local?

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• What do "Unknown SSAP" and "Unknown DSAP" mean in tcpdump?

  - by lacker

  While trying to fix a problem with intermittently losing internet connection on a machine with a wireless connection to a router, I ran tcpdump and noticed packets with "Unknown SSAP" and "Unknown DSAP" errors coming at a rate of a few per second. 20:27:21.703178 00:24:a5:af:24:f6 (oui Unknown) Unknown SSAP 0xde > 1c:65:9d:48:38:95 (oui Unknown) Unknown DSAP 0xe2 Information, send seq 0, rcv seq 16, Flags [Response], length 171 20:27:21.724726 00:24:a5:af:24:f6 (oui Unknown) Unknown SSAP 0xde > 1c:65:9d:48:38:95 (oui Unknown) Unknown DSAP 0xe2 Information, send seq 0, rcv seq 16, Flags [Response], length 104 20:27:21.746449 00:24:a5:af:24:f6 (oui Unknown) Unknown SSAP 0xde > 1c:65:9d:48:38:95 (oui Unknown) Unknown DSAP 0xe4 Information, send seq 0, rcv seq 16, Flags [Response], length 88 20:27:21.970963 00:24:a5:af:24:f6 (oui Unknown) Unknown SSAP 0xde > 1c:65:9d:48:38:95 (oui Unknown) Unknown DSAP 0xe8 Information, send seq 0, rcv seq 16, Flags [Response], length 76 20:27:22.016565 00:24:a5:af:24:f6 (oui Unknown) Unknown SSAP 0xde > 1c:65:9d:48:38:95 (oui Unknown) Unknown DSAP 0xea Information, send seq 0, rcv seq 16, Flags [Response], length 88 20:27:22.038471 00:24:a5:af:24:f6 (oui Unknown) Unknown SSAP 0xde > 1c:65:9d:48:38:95 (oui Unknown) Unknown DSAP 0xea Information, send seq 0, rcv seq 16, Flags [Response], length 171 What does the "Unknown SSAP" and "Unknown DSAP" mean, and does it indicate a problem?

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• VirtualBox error VERR_SUPDRV_COMPONENT_NOT_FOUND

  - by ant2009

  I am using Fedora 12, with kernel stv-fedora 2.6.31.12-174.2.22.fc12.i686 I have install VirtualBox OSE v3.1.4-1.fc12. When I start VirtualBox I get the following error: Failed to start the virtual machine WinXP32. Failed to open/create the internal network 'HostInterfaceNetworking-eth0' (VERR_SUPDRV_COMPONENT_NOT_FOUND). One of the kernel modules was not successfully loaded. Make sure that no kernel modules from an older version of VirtualBox exist. Then try to recompile and reload the kernel modules by executing '/etc/init.d/vboxdrv setup' as root (VERR_SUPDRV_COMPONENT_NOT_FOUND). However, if I run /etc/init.d/vboxdrv setup I get this error: -bash: /etc/init.d/vboxdrv: No such file or directory How do I get rid of the error and run VirtualBox?

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• DNS lookup failures while accessing my website some proxy error

  - by Bond

  Here is a situation until today morning,every thing has been working perfectly fine with me. From past 6 months many of my domains wer accessible as http://site1.myserver.com http://site2.myserver.com http://site3.myserver.com http://site4.myserver.com All these were Reverse Proxy configurations. I have some applications on each of them. until today morning some people reported me that http://site1.myserver.com/app1 is not working but http://site1.myserver.com is accessible but http://site2.myserver.com is accessible but http://site3.myserver.com is accessible but http://site4.myserver.com not accessible In past 6 months I have not changed any of these Apache configurations (things were working perfectly so) The error which can be seen in browser are while accessing http://site1.myserver.com/app1 Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /app1. Reason: DNS lookup failure for: myserver.com and same is the error for http://site4.myserver.com So what should I check in I have checked all the apache logs to an extent which I could see and 192.168.1.25 - - [10/Jan/2011:14:50:48 +0530] "GET /app1 HTTP/1.1" 502 531 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3" Mon Jan 10 14:27:42 2011] [error] (113)No route to host: proxy: HTTP: attempt to connect to 192.168.1.3:80 (192.168.1.3) failed [Mon Jan 10 14:27:42 2011] [error] ap_proxy_connect_backend disabling worker for (192.168.1.3) [Mon Jan 10 14:27:44 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:44 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:44 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:45 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:45 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:45 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:45 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:46 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:47 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:48 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:48 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:27:48 2011] [error] proxy: HTTP: disabled connection for (192.168.1.3) [Mon Jan 10 14:35:29 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: myserver.com returned by /app1 [Mon Jan 10 14:35:30 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: myserver.com returned by /app1 [Mon Jan 10 14:35:30 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: myserver.com returned by /app1 [Mon Jan 10 14:50:30 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: myserver.com returned by /app1 [Mon Jan 10 14:50:48 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: myserver.com returned by /app1 and for site4.myserver.com I get [Mon Jan 10 14:57:40 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: site4.myserver.com returned by /favicon.ico [Mon Jan 10 14:57:40 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: site4.myserver.com returned by /favicon.ico [Mon Jan 10 14:57:43 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: site4.myserver.com returned by /favicon.ico [Mon Jan 10 15:02:38 2011] [error] [client <some external IP>] proxy: DNS lookup failure for: site4.myserver.com returned by / [Mon Jan 10 15:03:04 2011] [error] [client <some external IP>] proxy: DNS lookup failure for: site4.myserver.com returned by /, referer: http://site4.myserver.com/ [Mon Jan 10 15:03:04 2011] [error] [client <some external IP>] proxy: DNS lookup failure for: site4.myserver.com returned by /favicon.ico [Mon Jan 10 15:03:08 2011] [error] [client <some external IP>] proxy: DNS lookup failure for: site4.myserver.com returned by /, referer: http://site4.myserver.com/ [Mon Jan 10 15:03:08 2011] [error] [client <some external IP>] proxy: DNS lookup failure for: site4.myserver.com returned by /favicon.ico [Mon Jan 10 15:03:10 2011] [error] [client <some external IP>] proxy: DNS lookup failure for: site4.myserver.com returned by /, referer: http://site4.myserver.com/ [Mon Jan 10 15:06:21 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: site4.myserver.com returned by / [Mon Jan 10 15:06:31 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: site4.myserver.com returned by /, referer: http://site4.myserver.com/ [Mon Jan 10 15:26:03 2011] [error] [client 192.168.1.25] proxy: DNS lookup failure for: site4.myserver.com returned by /

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• bonding module parameters are not shown in /sys/module/bonding/parameters/

  - by c4f4t0r

  I have a server with Suse 11 sp1 kernel 2.6.32.54-0.3-default, with modinfo bonding i see all parameters, but under /sys/module/bonding/parameters/ not modinfo bonding | grep ^parm parm: max_bonds:Max number of bonded devices (int) parm: num_grat_arp:Number of gratuitous ARP packets to send on failover event (int) parm: num_unsol_na:Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event (int) parm: miimon:Link check interval in milliseconds (int) parm: updelay:Delay before considering link up, in milliseconds (int) parm: downdelay:Delay before considering link down, in milliseconds (int) parm: use_carrier:Use netif_carrier_ok (vs MII ioctls) in miimon; 0 for off, 1 for on (default) (int) parm: mode:Mode of operation : 0 for balance-rr, 1 for active-backup, 2 for balance-xor, 3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, 6 for balance-alb (charp) parm: primary:Primary network device to use (charp) parm: lacp_rate:LACPDU tx rate to request from 802.3ad partner (slow/fast) (charp) parm: ad_select:803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2) (charp) parm: xmit_hash_policy:XOR hashing method: 0 for layer 2 (default), 1 for layer 3+4 (charp) parm: arp_interval:arp interval in milliseconds (int) parm: arp_ip_target:arp targets in n.n.n.n form (array of charp) parm: arp_validate:validate src/dst of ARP probes: none (default), active, backup or all (charp) parm: fail_over_mac:For active-backup, do not set all slaves to the same MAC. none (default), active or follow (charp) in /sys/module/bonding/parameters ls -l /sys/module/bonding/parameters/ total 0 -rw-r--r-- 1 root root 4096 2013-10-17 11:22 num_grat_arp -rw-r--r-- 1 root root 4096 2013-10-17 11:22 num_unsol_na I found some of this parameters under /sys/class/net/bond0/bonding/, but when i try to change one i got the following error echo layer2+3 > /sys/class/net/bond0/bonding/xmit_hash_policy -bash: echo: write error: Operation not permitted

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• Duplicate ping packages in Linux VirtualBox machine

  - by Darkmage

  i cant seem t figure out what is going on here. The Linux machine I am using is running as a VM on a Win7 machine using Virtual Box running as a service. If i ping the win7 Host i get ok result. root@Virtual-Box:/home/glennwiz# ping -c 100000 -s 10 -i 0.02 192.168.1.100 PING 192.168.1.100 (192.168.1.100) 10(38) bytes of data. 18 bytes from 192.168.1.100: icmp_seq=1 ttl=128 time=1.78 ms 18 bytes from 192.168.1.100: icmp_seq=2 ttl=128 time=1.68 ms if i ping localhost im ok root@Virtual-Box:/home/glennwiz# ping -c 100000 -s 10 -i 0.02 localhost PING localhost (127.0.0.1) 10(38) bytes of data. 18 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.255 ms 18 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.221 ms but if i ping gateway i get DUP packets root@Virtual-Box:/home/glennwiz# ping -c 100000 -s 10 -i 0.02 192.168.1.1 PING 192.168.1.1 (192.168.1.1) 10(38) bytes of data. 18 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.27 ms 18 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.46 ms (DUP!) 18 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=22.1 ms 18 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=22.4 ms (DUP!) if i ping other machine on same LAN i stil get dups. pinging remote hosts also gives (DUP!) result root@Virtual-Box:/home/glennwiz# ping -c 100000 -s 10 -i 0.02 www.vg.no PING www.vg.no (195.88.55.16) 10(38) bytes of data. 18 bytes from www.vg.no (195.88.55.16): icmp_seq=1 ttl=245 time=10.0 ms 18 bytes from www.vg.no (195.88.55.16): icmp_seq=1 ttl=245 time=10.3 ms (DUP!) 18 bytes from www.vg.no (195.88.55.16): icmp_seq=2 ttl=245 time=10.3 ms 18 bytes from www.vg.no (195.88.55.16): icmp_seq=2 ttl=245 time=10.6 ms (DUP!)

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• Specify IPSEC port range using ipsec-tools

  - by Sandman4

  Is it possible to require IPSEC on a port range ? I want to require IPSEC for all incoming connections except a few public ports like 80 and 443, but don't want to restrict outgoing connections. My SPD rules would look like: spdadd 0.0.0.0/0 0.0.0.0/0[80] tcp -P in none; spdadd 0.0.0.0/0 0.0.0.0/0[443] tcp -P in none; spdadd 0.0.0.0/0 0.0.0.0/0[0....32767] tcp -P in esp/require/transport; In setkey manpage I see IP ranges, but no mention of port ranges. (The idea is to use IPSEC as a sort of VPN to protect internal communications between multiple servers. Instead of configuring permissions basing on source IPs, or configuring specific ports, I want to demand IPSEC on anything which is not meant to be public - I feel it's less error-prone this way.)

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