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• How can I create persistent SSH connection to "stream" commands over a period of time?

  - by Darth

  Say that I have an application running on one PC that is sending commands via SSH to another PC on the network (both machines running Linux). For example every time something happens on #1, I want to run a task on #2. In this setup, I have to create SSH connection on every single command. Is there any simple way to do this with basic unix tools without programming custom client/server application? Basically all I want is to establish a connection over SSH and then send one command after another.

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• What do you use to loadbalance IPv6 services?

  - by Michael Renner

  Hi, the current Linux software environment for IPv6 load balancing looks a bit grim. IPVS has rudimentary support for IPv6 but it's far from complete. NAT for IPv6 seems to be a no-go. Are there any other projects which aim for this goal? Does the IPv6 support in other OS look better? Are there any commercial products which have been successfully used in production environments with non-trivial load patterns? Or is it just that the time for IPv6 hasn't come... yet? ;) best regards, Michael

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• Problem with kickstart

  - by user70523

  Hi, I created a kickstart file ks.cfg and then I have put that in the bootable disk*(Ubuntu 10.04)* and then added the following line to the isolinux.cfg linux ks=ks.cfg and have not removed any other lines from the isoconfig.cfg file and then while installing the installation is not automated,again it is asking for language and all. If i removed include menu.cfg or any other line from isolinux.cfg i am getting a boot error. What should i do now to automate the installation.Where should i add the boot parameters so that installation will start from the ks.cfg . Thanks and Regards Ravi Kumar

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• Changing startup parameters for MySQL

  - by RN

  I need to remove skip-networking from MySQL startup parameters I am running MySQL on Linux on Centos on a VPS Can someone please tell a newbie how to do this ? I suppose to start and stop the mySQL server, I have to do something like this /etc/init.d/mysqld stop /etc/init.d/mysqld start ps -ef|grep 'mysql' root 11331 20220 0 10:53 pts/0 00:00:00 grep mysql root 32452 1 0 Apr02 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe --skip-grant-tables --skip-networking mysql 32504 32452 0 Apr02 ? 00:00:18 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --socket=/var/lib/mysql/mysql.sock --skip-grant-tables --skip-networking

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• nagios-nrpe-unable-to-read-output [closed]

  - by Bill S

  Oracle Linux; Icinga; Nagios plugins I did all the easy steps command runs fine standalone through my normal login; looked at /var/log/messages to see if any clues there Trying to run plugin under nrpe login - cant login don't know password; does this password matter? can I reset it? clone id? Any way to have shell being executed log all commands and output to somewhere? Trying to run this shell script plugin "nqcmd OBIEE plugin for Nagios" from this URL: http://www.rittmanmead.com/2012/09/advanced-monitoring-of-obiee-with-nagios/ I went through script and made sure that everything obvious was set to 755 Any help would be appreciated

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• Compiling to a binary from source

  - by Chords

  I'm using WKHTMLTOPDF on a 64-bit Linux server and I'm running into problems with the version. Seen here: http://code.google.com/p/wkhtmltopdf/downloads/list There's slim pickins when it comes to pre-compiled binaries. I started with version 0.9.9 which has a few bugs. I upgraded to 0.11.0 RC 1 to find a slew of new problems, namely the following: http://code.google.com/p/wkhtmltopdf/issues/detail?id=730 I think 0.10 RC 2 would work, and the thread above suggests compiling from the source has a fix for the error I'm getting, but I don't know how to do that. Can anyone explain how I can create a static binary myself, or would anyone be willing to create and post one for the countless people waiting for this fix?

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• Webserver security, intrusion detection, and file intregrity

  - by enfield

  I would like to add some type of tracking / alerting on some linux webservers running PHP and Apache. In doing searches I have come across a lot of info from 2006-2009. Would like to revisit things and see what others are doing now. The main purpose here is to track when any files are changed and if so alert me somehow. The same goes for IDS and hopefully something that can reside on same server? Since some of these are small scale projects I would prefer opensource/free solutions that are really effective. Although I would still like to hear of other alternatives if someone has the experience and the cost can be justified.

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• Segfault with rtorrent on Debian Lenny

  - by digital

  Hi, My debian lenny server keeps segfaulting with rtorrent, it happens once every 24 hours. Libcurl has been recompiled to the latest version and it still seems to happen. I'm not the best when it comes to linux server admin but if you require more info about the system I'll try and get it for you. lib/rtorrent are 0.8.5/0.12.5 Any help would be appreciated as I'd like rtorrent up 24/7 Caught Segmentation fault, dumping stack: 0 rtorrent [0x439686] 1 rtorrent [0x43e06a] 2 /lib/libc.so.6 [0x7f73ce780f60] 3 /usr/lib/libcurl.so.4 [0x7f73d04f4431] 4 /usr/lib/libcurl.so.4 [0x7f73d04f47da] 5 /usr/lib/libcurl.so.4(curl_multi_remove_handle+0x341) [0x7f73d050acb1] 6 rtorrent [0x480221] 7 rtorrent [0x482915] 8 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1f95] 9 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1fea] 10 /usr/local/lib/libtorrent.so.11 [0x7f73d02b4cfc] 11 rtorrent [0x48058a] 12 rtorrent [0x439f49] 13 /lib/libc.so.6(__libc_start_main+0xe6) [0x7f73ce76d1a6] 14 rtorrent(_ZNSt8ios_base4InitD1Ev+0x71) [0x40ea99]

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• Kickstart virtual console: No 'Shell prompt' at Alt-F2

  - by Stefan Lasiewski

  I am installing Scientific Linux 6.1 via kickstart, and I am trying to debug a problem. According to Tips and tricks for anaconda and kickstart, I should have several virtual consoles available: What the different terminals display Alt-F1 The installation dialog when using text or cmdline Alt-F2 A shell prompt Alt-F3 The install log displaying messages from install program Alt-F4 The system log displaying messages from kernel, etc. Alt-F5 All other messages Alt-F7 The installation dialog when using the graphical installer The Virtual Consoles Alt-F1, F3, F4 & F5 all work and show various logging information. However, the Virtual Console at Alt-F2 does not do anything. I could really use access to the shell prompt (Alt-F2), however there is no Shell prompt available at the second virtual console (Alt-F2). All I have is a blinking '_'. Can I forge Alt-F2 to show me a shell prompt?

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• Automatically encrypting incoming email

  - by user16067

  I have a small website and would like to encrypt incoming email using gpg. Is there a way to force sendmail to check email and encrypt it if its not already encrypted? I'm using GPG on a linux server. Thanks [added]Someone asked what I hope to accomplish. My intent is for the users of the email to become more familiar with seeing thier own email encrypted and losing that fear of the unknown. The side benefit is that the email can't be looked at later down the road. If the email isn't encrypted on its way in, I'm unable to do anything about it. I'm assuming most email would be nosed around with once its already on my hard drive, so GPG would protect against those issues.

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• Make own dial-up ISP using broadband connection [on hold]

  - by SkylarMT

  So, I see no reason why this wouldn't be possible. I have a Linux server (a Raspberry Pi to be exact) connected via Ethernet to a broadband ISP. I want to be able to dial a number, have it go through the normal telephone network, onto the Internet via a VoIP provider (I know you can call a Skype user from a landline), to my Raspberry Pi, and then have the Pi connect me to the Internet. I've found guides on making your own ISP, but they all involve a dedicated phone line on the server end. Is there a way to do this with no modem on the server end? I live in an area with a lot of people still on dialup, and if I pull this off I could make some extra money. Thanks!

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• apache server not working after installing zend server

  - by kamal

  i have apache installed in my redhat 5.3 server machine. and i was trying to install zend server. i installed zend server with install.sh file in directory /var/zend. in my windows machine after installling zend server community edition i was able to access apache server as well as zend server. but in my linux machine localhost displays nothing and localhost:10081 shows zend server. what can i do to run my localhost? or should i seperately install apache?

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• Using rsync to take backup of folder

  - by Ali

  Hi, I have a server (Linux) with NAS which is mounted as folder "mount" I have website in "public_html" folder. I want to take backup of website in mount folder automatically at certain intervals for e.g. every hour. I read that there is something called "rsync" which is used to make two folders sync. And it doesn't copy all files every time and instead matches if the file has been changed and then only update changed files. How do I use it to make automatic backups? I have root access to server. Thanks

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• List of MD /Raid/LVM (Devices) = How to mount them without any further information available?

  - by Jens

  Hello Expets, I do not have much skills in linux and installed a system two years ago that I now had to reboot, but it seems I did not automate everything with start-scripts... My Problem: I miss some mountpoints. I have a list of my raids (excerpt:) md3 : active (auto-read-only) raid1 sda6[0] sdb6[1] 97659008 blocks [2/2] [UU] md4 : active (auto-read-only) raid1 sda7[0] sdb7[1] 250099776 blocks [2/2] [UU] and it seems md3 and md4 are NOT mounted. However i do NOT have any entries for them fstab file. What should I do next. I do NOT know which filesystem they have (most likely ext3). =Can I savely try to mount them with (mount -t ext3 /dev/md3 /mnt/mymntpoint) or will the lead to corrupted data, in case they are not ext3? What should I do next (based on the information given above). The goal is to remount these Devices again, but I do not know anything about them anymore... Thank you very much Jens

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• Automatically updating routing table on server

  - by bramp

  I have a LAN with three routers on it, one connected to the Internet, one VPN router connected to a few remote sites, and a final route connected to a private network (using BGP to get prefix advertisements). On the same LAN I have multiple Linux servers which needs access to the networks behind each router. I have achieved this by configuring static routes on the server, pointing the different network prefixes to the correct router. This has worked well, but every time we connect to a new remote VPN, we have to change all the servers to be aware that the network is now accessible via the VPN, and not via the default Internet route. What I want is a way to automatically update the routes on all of the servers, when the route is added to a routers. Now, I could install Quagga or something similar on all the servers to receive router advertisements, but that seems like overkill. So my question is what is the easiest/simpliest way to update the routing tables on the server automatically, and what protocol is best suited for this purpose. thanks

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• Ways for managing the installation and configuration of various software applications and settings i

  - by EmpireJones

  What are some ways for managing the installation and configuration of various software applications and settings in group of linux development and server computers? Is a set of basic scripts a good means of attack? I was thinking about just having a ton of scripts, such as: setup_dev_env [install|uninstall|reinstall] setup_nfs [...] setup_nfs_share [...] setup_http [...] setup_memcache_node [...] Is there any better method? It would be nice to be able to "upgrade" an installation script too, for example, to change common development settings.

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• Can I use dmraid instead of md (mdadm) to make software RAID-1 and RAID-1+0 volumes?

  - by Don MacAskill

  On a related question about SSDs and TRIM (see: Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux? ), it turns out that dmraid may now (or shortly) support TRIM on RAID-1. Typically, we've used md (via mdadm) to create our RAID-1 volumes, then used LVM to create volume groups, then formatted with the file system of our choice (ext4 lately). We've been doing this for years, and Google & ServerFault searches seem to confirm this is the most common way of doing software RAID with volume management. Google searches seem to suggest that dmraid is use for so-called 'fakeRAID' configurations where there's some level of hardware 'help' in the form of RAID BIOS in the controller, which we don't have (and don't want to use - we'd like a fully software solution). Since we'd like to use TRIM on our SSDs, and since md doesn't seem to (yet?) support TRIM, I'm wondering if it's possible to use dmraid instead of md to create RAID-1 (and RAID-1+0) volumes in software, with no hardware support (ie, just plugged into a dumb SATA/SAS bus)?

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• How to share files between cPanel accounts?

  - by Darren

  I am setting up a multi-site/multi-store Magento installation, and I want each site to have its own cPanel account so I can setup the SSL and dedicated IP properly. I have tried to create a linux group called 'magento' and changed the files I need to share to that group (even added the users to that group), however when I try to access files through my scripts on those accounts it doesn't acknowledge the files exist. I first made a soft symbolic link which didn't work and then including them to their real location but it didn't work. Am I missing a step in allowing which users can access which files? I added the users to the magento group and like I said changed the group of the files I need to share to them but it's still not working. Thanks, Darren

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• information about /proc/pid/sched

  - by redeye

  Not sure this is the right place for this question, but here goes: I'm trying to make some sense of the /proc/pid/sched and /proc/pid/task/tid/sched files for a highly threaded server process, however I was not able to find a good explanation of how to interpret this file ( just a few bits here: http://knol.google.com/k/linux-performance-tuning-and-measurement# ) . I assume this entry in procfs is related to newer versions of the kernel that run with the CFS scheduler? CentOS distro running on a 2.6.24.7-149.el5rt kernel version with preempt rt patch. Any thoughts?

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• SSH broken, segfault error 4

  - by trampi

  i cannot connect to my server via ssh, it throws me a "server unexpectedly closed connection" after entering the password. in var/log/messages the only noteable message is: Apr 14 17:41:23 s15410270 kernel: sshd[3602]: segfault at c0 ip 7f0801acbdb0 sp 7fff0adff860 error 4 in libc-2.8.so[7f0801a87000+14f000] Apr 14 17:41:29 s15410270 kernel: sshd[3606]: segfault at c0 ip 7f75f9463db0 sp 7fff027971f0 error 4 in libc-2.8.so[7f75f941f000+14f000] This message appears after a log in attempt via ssh or via sftp Its a SuSE Linux server. I'm looking for help where to start to search for the error, i can still act as root via a serial console. edit: "server unexpectedly closed connection" only appears if i enter the correct password!

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• apache server mapping to tomcat issues

  - by Karthick

  I am working on the flex application. Back end is spring/Hibernate. The application is working fine in my local XP system. When i am trying to deploy in the server i'm facing the issue. The issue is how to map the java in apache when i am by passing the apache & works in tomcat my application is working good. But not in the apache.. This can be fixed by mapping the java in apache. I don't know how to map this. can u help me out My server properties Linux lumiin.ch 2.6.18-028stab095.1 i686 Regards Karthick

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• SNMP bytes received disagrees with ifconfig

  - by NightFalcon

  SNMP ifInOctets = 2145342796 - about 2GB. ifconfig: RX bytes:174302710687 (174.3 GB) Interestingly, the sent bytes agree almost perfectly: ifOutOctets: 1002415050 - about 1GB ifconfig: TX bytes:1002418728 (1.0 GB) It's not an SNMP discontinuity: snmpwalk -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.19 iso.3.6.1.2.1.31.1.1.1.19.1 = Timeticks: (0) 0:00:00.00 iso.3.6.1.2.1.31.1.1.1.19.2 = Timeticks: (0) 0:00:00.00 iso.3.6.1.2.1.31.1.1.1.19.3 = Timeticks: (0) 0:00:00.00 Anyone have an idea for this discontinuity in the sent data numbers? Thanks so much! (net-snmp, Ubuntu Linux, 12.04 LTS)

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• How to stop ethernet interface in bridge configuration from obtaining IP address via DHCP

  - by user71061

  Hi! I'm trying to configure openvpn in bridging configuration. First step of doing this requires creating bridge interface (br0), bridging together physical ethernet interface (eth0) and logical tap0 interface. This can be done with simple script but I want to use less popular approach, configuring bridge interface entirely via /etc/network/interfaces file (on Debian linux). So I have removed all eth0 definitions form /etc/network/interfaces and replaced if with following br0 definition: auto br0 iface br0 inet static pre-up openvpn --mktun --dev tap0 address 10.0.0.1 netmask 255.255.255.0 bridge_ports eth0 tap0 post-down openvpn --rmtun --dev tap0 This works as I expected, but there is only one problem: interface eth0 is part of bridge interface br0 AND it also receive it's own IP address from my DHCP server (located on same LAN where eth0 is connected). My questions is: how to stop eth0 interface from obtaining it's own IP address? (It should only be part of br0 bridge).

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• Best way to replicate servers

  - by Matthew

  I currently have two servers both with linux software RAID1 configurations. They use heartbeat and DRBD to create a shared DRBD device that hosts a a exported NFS directory. The servers run Ubuntu Server with a LXDE GUI and some IP These servers are going to be placed on fishing vessels to act has redundant storage for IP cameras. My boss wants me to figure out the most efficient way to create these servers. We might be looking at pushing out several systems a week. Each configuration will be almost identical besides IP addressing. What would be the best method to automate the configuration process? We are trying to cut down on labor costs to set these up. Imaging and Proceeding are both on my mind right now

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• MySQL Daemon failed to start

  - by T. Brian Jones

  THE SETUP I'm running Linux CentOS on an Amazon EC2 instance. The MySQL data files are on an EBS Drive mounted at /data/ ( symlink - /var/lib/mysql /data/mysql ). Everything works fine in this setup. THE PROBLEM I'm trying to move everything from this EBS drive to a new drive. I umounted the /data/ drive, and mounted it at /data2/. Then I mounted the new drive at /data/ and copied everything over to it from /data2/. Everything on the system works great, except MySQL. Every time I try to start the MySQL daemon ( /etc/init.d/mysqld start ) I get a MySQL Daemon failed to start error.

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