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• SSH session becomes unresponsive when logged into Ubuntu Server virtual machine using VirtualBox

  - by nickbart

  Hi everyone, I'm really at my wits end here, so I'm hoping someone here can help me. I have a virtual machine running Ubuntu Server 9.10. It's just a small development environment so I can keep my code separate from the test and production environments. I am running it through VirtualBox 3.1.6 on a laptop running Ubuntu Desktop 9.10. I have it set up with a bridged network connection and it is bridged to my laptop's wireless adapter. We have no wired connections in this office. I boot up the VM and everything is fine. I can SSH into it using gnome-terminal and for a while everything is Kosher. Then seemingly randomly, the SSH terminal session with hang. No error message, nothing; it just becomes unresponsive. If I go to the VirtualBox terminal I find the VM itself is perfectly fine. It can ping and I can SSH out with it. If I restart the networking on the VM the SSH session in my gnome-terminal will most of the time become responsive again. Here's an interesting point, the SSH session will sometimes die right in the middle of me typing something (this points to it not being an idle session issue) and if I go to the VirtualBox terminal and restart the networking and then return to my gnome-terminal SSH session I find that it will come back to life and what I typed when the session hung originally will magically type itself in to the buffer. So, my input is getting stored somewhere and just can't make its way to the VM until the networking on the VM is restarted. I've tried different versions of VirtualBox and used vmdk images and vdi images and nothing seems to work. I can't tell if the problem is with my laptop, VirtualBox, or the Ubuntu Server VDI. Is there anyway to debug this issue? Or has anyone out there seen anything similar? Your help is much appreciated. Nick

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• IP queue buffer

  - by summerbulb

  I seem to have an issue with IP queue. I have a linux machine that I am using to run some experiments. The linux machine is configured to be a router, having two NICs, connecting two other computers, and managing their network traffic. All incoming packages are captured, using iptables, and analyzed by a C application. The application analyzing the packets has a built-in delay, as part of the experiment. So I have one very fast computer sending packets through my linux-router and a (relatively) slow linux-router that analyses and deals with the packets, one by one. This situation leads to the fact that when I fire up a sender application on one of the computers connected to the linux-router, my IP queue on the linux-router gets filled up (almost) instantaneously. The IP queue's max length is currently set to 1024, and if it overflows, the packets are dropped. This is expected and i'm OK with it. But, (and this is where it gets interesting), every now and then I get the following error: "Failed to receive netlink message: No buffer space available" At start, I thought this was due to the IP queue overflow, but after some analysis i found that sometimes I get the error even if the IP queue buffer did not overflow, and sometime I DON'T get the message even though the buffer DID overflow. When I run > cat /proc/net/ip_queue, I get the following table (also used to monitor the IP queue overflow): Peer PID : 27389 Copy mode : 2 Copy range : 65535 Queue length : 0 Queue max. length : 1024 Queue dropped : 1166875 Netlink dropped : 2916 Looking at the last two values, Queue dropped seems to refer to packets that did not manage to get into the IP queue because the buffer was full. I can see this value rise as I bombard the linux-router. Netlink dropped ( as it's name implies :) ) seems to have to do with the error i'm getting. I did my best to search for material on this error, but wasn't able to find anything that seemed to point me in the required direction. Bottom line: Why am I getting this error and what can I do to avoid it?

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• Adding custom service to nagiosgraph

  - by ravloony

  I have successfully added nagiosgraph to our nagios installation. I also added a memory checker plugin, from here : http://blog.vergiss-blackjack.de/2010/04/nagios-plugin-to-check-memory-consumption/. However I can't seem to get the graph of this service to be output by nagiosgraph. The plugin returns a single line like this: 31% (3785 of 11903 MB) used so i added a rule like this to the map file: /output:(\d+)% \((\d+) of (\d+) MB\) used/ and push @s, ['Mem', ['Percentage', 'GUAGE', $1], ['Used', 'GUAGE', $2], ['Total', 'GUAGE', $3] ]; I have also read this : http://www.mail-archive.com/[email protected]/msg36835.html and made sure that process_performance_data=1 in the nagios conf file. So far I have no graph for the Mem service on any host, and no rrd file either. I am unsure how to proceed to get this working. The documentation is rather difficult to follow and I haven't managed yet to understand it enough to do this. Can anyone point me to a tutorial, or some documentation which explains the steps needed to get a service noticed and graphed by nagiosgraph?

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• How to find out what is causing a slow down of the application on this server?

  - by Jan P.

  This is not the typical serverfault question, but I'm out of ideas and don't know where else to go. If there are better places to ask this, just point me there in the comments. Thanks. Situation We have this web application that uses Zend Framework, so runs in PHP on an Apache web server. We use MySQL for data storage and memcached for object caching. The application has a very unique usage and load pattern. It is a mobile web application where every full hour a cronjob looks through the database for users that have some information waiting or action to do and sends this information to a (external) notification server, that pushes these notifications to them. After the users get these notifications, the go to the app and use it, mostly for a very short time. An hour later, same thing happens. Problem In the last few weeks usage of the application really started to grow. In the last few days we encountered very high load and doubling of application response times during and after the sending of these notifications (so basically every hour). The server doesn't crash or stop responding to requests, it just gets slower and slower and often takes 20 minutes to recover - until the same thing starts again at the full hour. We have extensive monitoring in place (New Relic, collectd) but I can't figure out what's wrong; I can't find the bottlekneck. That's where you come in: Can you help me figure out what's wrong and maybe how to fix it? Additional information The server is a 16 core Intel Xeon (8 cores with hyperthreading, I think) and 12GB RAM running Ubuntu 10.04 (Linux 3.2.4-20120307 x86_64). Apache is 2.2.x and PHP is Version 5.3.2-1ubuntu4.11. If any configuration information would help analyze the problem, just comment and I will add it. Graphs info phpinfo() apc status memcache status collectd Processes CPU Apache Load MySQL Vmem Disk New Relic Application performance Server overview Processes Network Disks (Sorry the graphs are gifs and not the same time period, but I think the most important info is in there)

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• Is there a limit setting a php_admin_value in php-fpm?

  - by PeeHaa

  I am trying to set a large value in the configuration of a pool in php-fpm, but at some point it just doesn't start anymore. php_admin_value[disable_functions] = dl,exec,passthru,shell_exec,system,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source,pcntl_exec,include,include_once,require,require_once,posix_mkfifo,posix_getlogin,posix_ttyname,getenv,get_current_use,proc_get_status,get_cfg_va,disk_free_space,disk_total_space,diskfreespace,getcwd,getlastmo,getmygid,getmyinode,getmypid,getmyuid,ini_set,mail,proc_nice,proc_terminate,proc_close,pfsockopen,fsockopen,apache_child_terminate,posix_kill,posix_mkfifo,posix_setpgid,posix_setsid,posix_setuid,fopen,tmpfile,bzopen,gzopen,chgrp,chmod,chown,copy,file_put_contents,lchgrp,lchown,link,mkdi,move_uploaded_file,rename,rmdi,symlink,tempnam,touch,unlink,iptcembed,ftp_get,ftp_nb_get,file_exists,file_get_contents,file,fileatime,filectime,filegroup,fileinode,filemtime,fileowne,fileperms,filesize,filetype,glob,is_di,is_executable,is_file,is_link,is_readable,is_uploaded_file,is_writable,is_writeable,linkinfo,lstat,parse_ini_file,pathinfo,readfile,readlink,realpath,stat,gzfile,create_function When trying to restart php-fpm it fails with the following message: Stopping php-fpm: [ OK ] Starting php-fpm: [20-Oct-2013 22:31:52] ERROR: [/etc/php-fpm.d/codepad.conf:235] value is NULL for a ZEND_INI_PARSER_ENTRY [20-Oct-2013 22:31:52] ERROR: Unable to include /etc/php-fpm.d/codepad.conf from /etc/php-fpm.conf at line 235 [20-Oct-2013 22:31:52] ERROR: failed to load configuration file '/etc/php-fpm.conf' [20-Oct-2013 22:31:52] ERROR: FPM initialization failed [FAILED] When I remove the last disabled function (create_function) it start again. I also tried with other functions, but this gives the same error so it's not related to the create_function function. The string currently is just over 1KB in size so it looks like I have hit a limit here? Is my assumption correct? Is there a way to overcome this limit? I also tried to add another php_admin_value[disable_functions] underneath it (hoping it would be appended), but that didn't work (it just used the first one).

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• Router drops internet connection if I connect an additional pc

  - by BluePerry

  Hey, I'm using a SMC2804WBRP-G router connected to my ADSL-modem. Usually there are two computers connected to this router: a win7 ultimate desktop(wired) and a macbook air (wireless). Both working absolutely fine and never caused any connection drops as far as I know. A new room mate moved in last month and each time she starts up her win7 home laptop the router looses the internet connection. The laptop is on a wired connection. The first time she connected to my router, the connection dropped every 2 mins. To find out whats wrong with her machine I disabled all unnecessary services etc. besides the anti virus software. That helped to eliminate almost all of those periodic connection drops. But the start up drop remained and I've got the feeling that the router is still loosing connection from time to time. I haven't had the time to find out what service caused the periodic drops. But I'm more concerned about is that start up drop. Can anyone point me in the right direction to look for the problem? I would be very thankful for any hints or tips!

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• FWBuilder DNS Object Run Time - when exactly does it resolve the DNS name?

  - by Jakobud

  In Firewall Builder, when you use the DNS Object and set it to run time, when exactly does the firewall (iptables in our case) actually resolve the DNS name? Is it whenever a call is made to that DNS name in the firewall? So the firewall would resolve the name on the fly whenever someone/something tries to access that DNS name? Or is it when you execute the fw script to load the rules into iptables? So in this case, it would resolve the DNS name that one time and then hard-code the resulting ip address into the iptable rules? From what I read, I think its #1, but it's just not 100% clear to me. We have two servers for a certain function on our network. One is the primary server and one is backup. alpha0.domain.com alpha1.domain.com In DNS we have this: alpha.domain.com -> alpha0.domain.com If the primary server goes down and we need to switch to the backup, I just change our local DNS record to point to alpha1.domain.com instead. So back to the firewall, if I just put in a Domain Object as alpha.domain.com, do I have to reload the firewall rules every time we switch to the backup alpha server and change the DNS record? Or will the firewall automatically resolve to the correct address even after the switch?

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• How to encourage Windows administrators to pick up scripting?

  - by icelava

  When I worked as an administrator in my first job, I was frustrated that our administration processes with Windows servers were a series of point-and-clicks; we could never match the level of efficiency with the Unix servers which had a group of shell scripts to automate a lot of the work. I soon read about WSH and ADSI and wasted no time learning just how much automation I was able to achieve with scripting. There was a huge problem though - almost none of my Windows colleagues were really interested in learning scripting. They seemed happy with the manually mouse-clicking chores and were never excited at the prospect of using scripts to do the work on their behalf. I struggled to convince them to pick up scripting skills despite the evident increases in efficiency. I left that job in pursuit of a full-time software development career thereafter. Almost a decade on working in various environments and different customers, I still encounter Windows administrators mainly possessing this general "mood" where they would avoid scripting as much as possible. Despite the increasing level of accessibility Windows server technologies are opening up for scripting and automation. I am almost certain the majority of administrators are administrators precisely because they absolutely hate performing any kind of programming duties. What are some means to encourage and motivate administrators that scripting can really help them in the long run?

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• How do I reinitialise a failed RAID 5 drive using terminal on Ubuntu Server

  - by Stephen

  I've currently put together a new system and part of that has been creating a software RAID 5 using 'mdadm' in Ubuntu Server. I successfully got to the point where I create the array using: sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=4 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 I left it to do its thing overnight then used the following command to check on it: watch cat /proc/mdstat To which the following was returned: Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid5 sdd1[4](S) sdc1[2] sdb1[1] sda1[0](F) 5860535808 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/2] [_UU_] unused devices: <none> It appears that one has failed (and I'm not too savvy with why another is a spare). So, just to be sure that something else isn't amiss I wanted to try and re-engage the failed drive. Can someone explain how I can do that and what I should do with the spare (if anything). And also how do I know when synchronisation is complete? The tutorial I used to get this far is located here: http://sonniesedge.co.uk/2009/06/13/software-raid-5-on-ubuntu-904/ Many thanks! p.s. Here is some extra information that may help: sudo mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Mon Jun 18 21:14:21 2012 Raid Level : raid5 Array Size : 5860535808 (5589.04 GiB 6001.19 GB) Used Dev Size : 1953511936 (1863.01 GiB 2000.40 GB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Update Time : Mon Jun 18 21:50:26 2012 State : clean, FAILED Active Devices : 2 Working Devices : 3 Failed Devices : 1 Spare Devices : 1 Layout : left-symmetric Chunk Size : 512K Name : myraidbox:0 (local to host myraidbox) UUID : a269ee94:a161600c:fb1665e7:bd2f27b3 Events : 13 Number Major Minor RaidDevice State 0 0 0 0 removed 1 8 17 1 active sync /dev/sdb1 2 8 33 2 active sync /dev/sdc1 3 0 0 3 removed 0 8 1 - faulty spare /dev/sda1 4 8 49 - spare /dev/sdd1

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• Connect to Nonencrypted Wireless Network Using Ubuntu Commands

  - by Tim

  I failed to connect to an open i.e. nonencrypted wireless network using Ubuntu command lines. Here is what I did: $ sudo /etc/init.d/NetworkManager stop * Stopping network connection manager NetworkManager [ OK ] $ sudo /sbin/ifconfig wlan0 up $ sudo iwconfig wlan0 essid "Cavalier High-Speed 866-4-CAVTEL" $ sudo dhclient wlan0 There is already a pid file /var/run/dhclient.pid with pid 10812 killed old client process, removed PID file Internet Systems Consortium DHCP Client V3.1.1 Copyright 2004-2008 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ wmaster0: unknown hardware address type 801 wmaster0: unknown hardware address type 801 Listening on LPF/wlan0/00:0e:9b:cd:4e:18 Sending on LPF/wlan0/00:0e:9b:cd:4e:18 Sending on Socket/fallback DHCPREQUEST of 192.168.1.67 on wlan0 to 255.255.255.255 port 67 DHCPREQUEST of 192.168.1.67 on wlan0 to 255.255.255.255 port 67 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 21 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6 No DHCPOFFERS received. Trying recorded lease 192.168.1.67 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. --- 192.168.1.1 ping statistics --- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms Trying recorded lease 192.168.1.45 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. --- 192.168.1.1 ping statistics --- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms No working leases in persistent database - sleeping. $ sudo /sbin/iwconfig wlan0 wlan0 IEEE 802.11bg Mode:Managed Frequency:2.422 GHz Access Point: Not-Associated Tx-Power=27 dBm Retry min limit:7 RTS thr:off Fragment thr=2352 B Encryption key:off Power Management:off Link Quality:0 Signal level:0 Noise level:0 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 I was wondering what the problem is and how I can do it right? Thanks and regards!

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• Does MySQL have some kind of DoS protection or per-user query limit?

  - by Ghostrider

  I'm a bit at a loss. I'm running a MySQL database that's roughly 1GB data in indices combined on a dedicated Linux server. DB version is '5.0.89-community'. Configuration is controlled via cPanel. PHP actually runs elsewhere on a shared hosting. IP addresses are static and don't change. Access from remote IP address is properly configured. Website gets around 10K hits per day with each hit generating a a database query. Some of these queries are expensive (~1 sec execution time). All is fine and well until at some point DB server starts refusing connections from the client, claiming that specific user can't access the server from that IP. Resetting the server will always fix the problem for a day or two and then the same thing happens. There are some other DBs on that server, some of which are hit pretty hard on occasion but constantnly. One of the apps maintains several persistent connections since it does couple of updates per minute. Though I don't think it's related. What's driving me mad is that I can't figure out why server would start refusing connections. There is nothing in the logs. This server is a hosted dedicated server so hosting company created the OS image and I didn't write or go over every line of configuration. I'd do it but I'm at a loss as to where start looking. Any advice is appreciated.

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• apache2 server running ruby on rails application has go daddy cert that works in chrome/firefox and ie 9 but not ie 8

  - by ryan

  I have a rails application up on a linode ubuntu 11 server, running apache2. I have a cert purchased from godaddy, (where we also bought our domain) and the cert is installed on my server. Part of my virtual host file: ServerName my_site.com ServerAlias www.my_site.com SSLEngine On SSLCertificateFile /path/my_site.com.crt SSLCertificateKeyFile /path/my_site.com.key SSLCertificateChainFile /path/gd_bundle.crt The cert works fine in Chrome, FireFox and IE 9+ but in IE 8- I get this error: There is a problem with this website's security certificate. The security certificate presented by this website was issued for a different website's address. I'm hosting multiple rails apps on this same server (4 right now plus some old php sites that don't need ssl). I have tried googling every possible combination of the error/situation that I could think of but at this point I'm shooting in the dark. The closest I could come up with is that some versions if IE don't support SNI. But that doesn't apply here because I am getting the warning on windows 7 machines running IE 8, and the SNI only seemed to apply to IE 8 if the operating system was windows XP. So why is this cert being accepted by all browsers but giving me a warning in IE 8? Edit: So doing a little more digging and I figured out some more. It turns out this is effecting IE 9 as well. However the problem seems to be that IE is not traversing the ssl chain to get to the right cert. FireFox and Chrome when I go to view certificate show the correct one, but IE is showing one of our other sites certificates. REAL QUESTION HERE: That being the case why is IE not getting the right certificate when others are and how do I fix it?

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• Apache Virtual host (SSL) Doc Root issue

  - by Steve Hamber

  I am having issues with the SSL document root of my vhosts configuration. Http sees to work fine and navigates to the root directory and publishes the page fine - DocumentRoot /var/www/html/websites/ssl.domain.co.uk/ (as specified in my vhost config) However, https seems to be looking for files in the main apache document root found further up the httpd.conf file, and is not being overwritten by the vhost config. (I assume that vhost config does overwrite the default doc root?). DocumentRoot: The directory out of which you will serve your documents. By default, all requests are taken from this directory, but symbolic links and aliases may be used to point to other locations. DocumentRoot "/var/www/html/websites/" Here is my config, I am quite a new Linux guy so any advise is appreciated on why this is happening!? NameVirtualHost *:80 NameVirtualHost *:443 <VirtualHost *:443> ServerAdmin root@localhost DocumentRoot /var/www/html/websites/https_domain.co.uk/ ServerName ssl.domain.co.uk ErrorLog /etc/httpd/logs/ssl.domain.co.uk/ssl.domain.co.uk-error_log CustomLog /etc/httpd/logs/ssl.domain.co.uk/ssl.domain.o.uk-access_log common SSLEngine on SSLOptions +StrictRequire SSLCertificateFile /var/www/ssl/ssl_domain_co_uk.crt SSLCertificateKeyFile /var/www/ssl/domain.co.uk.key SSLCACertificateFile /var/www/ssl/ssl_domain_co_uk.ca-bundle </VirtualHost> <VirtualHost *:80> ServerAdmin root@localhost DocumentRoot /var/www/html/websites/ssl.domain.co.uk/ ServerName ssl.domain.co.uk ErrorLog /etc/httpd/logs/ssl.domain.co.uk/ssl.domain.xo.uk-error_log CustomLog /etc/httpd/logs/ssl.domain.co.uk/ssl.domain.xo.uk-access_log common </VirtualHost>

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• How to correctly set GNU Screen to display currently running program in hardstatus

  - by johnny_bgoode

  I posted this question on SuperUser but it's hardly getting any views, so I thought I'd ask here as well. In bash, to display the name of the current program in the GNU Screen hardstatus line takes only two configuration lines. First, tell screen what the end of your prompt normally looks like, and supply a default title for a window when you are sitting at in the shell: shelltitle "$ |bash" Next, place this escape sequence in the PS1 variable, before the characters that normally terminate the prompt '$ ' in this case: \033k\033\\\ This technique works, to a point. The hardstatus window title is updated to the name of the currently running program, and then switches back to the default title shortly after execution is finished. One major problem, however, is that this escape string is not escaped itself, causing line-wrapping problems with commands longer than the initial line. This was annoying, so I set out looking for a solution. Turns out, simply escaping the previous escape sequence corrects line wrapping: [\033k]\[\033\\\] Great! My hardstatus window title still updates to the name of the currently running program, and now my longer commands wrap to the second line correctly. However, with this new escape sequence in my PS1, screen updates the window title to the actual command I am typing, not simply the name of the current program once it is executed. I am wondering, has anyone gotten this working correctly - i.e. line wrapping and proper updating of the hardstatus window title? Thanks!

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• How to correctly set GNU Screen to display currently running program in hardstatus

  - by johnny_bgoode

  In bash, to display the name of the current program in the GNU Screen hardstatus line takes only two configuration lines. First, tell screen what the end of your prompt normally looks like, and supply a default title for a window when you are sitting at in the shell: shelltitle "$ |bash" Next, place this escape sequence in the PS1 variable, before the characters that normally terminate the prompt '$ ' in this case: \033k\033\\ This technique works, to a point. The hardstatus window title is updated to the name of the currently running program, and then switches back to the default title shortly after execution is finished. One major problem, however, is that this escape string is not escaped itself, causing line-wrapping problems with commands longer than the initial line. This was annoying, so I set out looking for a solution. Turns out, simply escaping the previous escape sequence corrects line wrapping: \[\033k\]\[\033\\\] Great! My hardstatus window title still updates to the name of the currently running program, and now my longer commands wrap to the second line correctly. However, with this new escape sequence in my PS1, screen updates the window title to the actual command I am typing, not simply the name of the current program once it is executed. I am wondering, has anyone gotten this working correctly - i.e. line wrapping and proper updating of the hardstatus window title?

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• How do I setup JBoss 5.1.0.GA to run multiple instances?

  - by djangofan

  Does anyone have any experience or advice in setting up multiple JBoss 5.1.x instances on the same machine that has 1 network card? Here is what I did: Installed JBoss 5.1.0.GA into c:\myjboss 1.5. I copied the server/default directory to server/ports-01 and server/ports-02 so they have their own config. did I assume correctly? Ran .\run.bat -c ports-01 Ran .\run.bat -c ports-02 At this point there are 2 instances but the second instance doesn't load correctly because of what is probably a few port conflicts. For example: the http port ends up being 8080 for both instances, which it gets from line #49 in the C:\myjboss\server\all\conf\bindingservice.beans\META-INF\bindings-jboss-beans.xml file. Earlier in the server load it clearly gets the value from line#63 in that same file. I don't know why it gets part of the port config from line #49 and the other part from line#63. Confused. I also tried: .\run.bat -Djboss.service.binding.set=ports-01 -c ports-01 and it made little difference. Any ideas on what I am doing wrong?

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• How do I uncompress vmlinuz to vmlinux?

  - by Lord Loh.

  I have already tried uncompress, gzip, and all other solutions that come up as google results and these have not worked for me. To get just the image search for the GZ signature - 1f 8b 08 00. > od -A d -t x1 vmlinuz | grep '1f 8b 08 00' 0024576 24 26 27 00 ae 21 16 00 1f 8b 08 00 7f 2f 6b 45 so the image begins at 24576+8 => 24584. Then just copy the image from the point and decompress it - > dd if=vmlinuz bs=1 skip=24584 | zcat > vmlinux 1450414+0 records in 1450414+0 records out 1450414 bytes (1.5 MB) copied, 6.78127 s, 214 kB/s Got these instructions verbatim from a forum online: http://www.codeguru.com/forum/showthread.php?t=415186 This process does not work for me and end up giving errors that states file not found 0024576 and all subsequent numbers. How do I proceed extracting vmlinux from vmlinuz? Thank you. EDITED: This is a reverse engineering question. I have no access to the distro to install any RPM or recompile. I start with nothing but vmlinuz.

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• IIS6 Multiple SSL websites to a single HTTP website?

  - by docflabby

  Running a IIS6 server on Windows 2003. All the websites use ASP.NET I have a number of websites all running separate HTTP websites: www.domain1.com www.domain2.com www.domain3.com I have a separate HTTPS website www.secure.com These websites are all running on the same server. I now wish to intergrate the content of www.secure.com into each of the domains in a transparent way. Such that each website despite having its own SSL connection displays the same website. The complicatrion is www.secure.com needs to know which website the connection has come from to apply the appropriate branding. The idea behind this is to have only one website, and location, but it keeps the core website brand. https://domain1.com looks alot better from a marketing point of view (and avoids users getting confused about what our secure website is) SSL www.domain1.com/secure - displays www.secure.com (branded domain1) SSL www.domain2.com/secure - displays www.secure.com (branded domain2) SSL www.domain3.com/secure - displays www.secure.com (branded domain3) How would the best way of achieving this, i'm open to using additional software if necessery. Would a reverse proxy be sutible for this situation?

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• Number of routers in small community lock up and require reboot.

  - by Anthony Hiscox

  I live in a small town which has one primary ISP. Lately I have noticed that a number of wireless routers have been locking up and requiring a reboot before allowing any connections. This has affected two of my routers, my work router, and a few others. In all cases wired continued to function as usual. Often wireless clients can see the SSID but simply won't connect. I can only think of a few possibilities and was hoping someone here might be able to point me in the right direction: Our ISP is well known to be flaky, something they are doing is causing this, what that might be I have no clue it as seems to affect the wireless only. There's a power issue in town, given our remote location and reputation for crap electrical, this seems reasonable. Only one router was plugged in to a UPS, and I'm not sure of the quality. There is some bug in all the different firmware for every one of these routers (all different). That doesn't seem reasonable, unless; it's an unknown (or known) exploit or DoS of some sort being launched by a massive team of ninjas hell bent on forcing us all to be tethered to our walls by ethernet cables or; it's just been a coincidence and I'm just paranoid (this has some weight, I mean read 4 again). Anyone else experience similar issues and have some tips?

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• Is Cherokee (probably) the best static content server for beginner sysadmins?

  - by Bad Learner

  I have read the pros and cons of most of the popular web servers and have come to a conclusion that Apache would (probably) be the best web server for serving dynamic content - - no wonder YouTube, Flickr and Facbook, among many others, use it. I do not know if that C10K problem applies to Apache even when serving dynamic content only, but I think any web server used to serve dynamic content needs some good tweaking for optimized performance, and the fact that nothing beats Apache when it comes to documentation, resources and support on the web, I think should will go with Apache for dynamic content. That apart, the confusion begins when it comes to choosing web servers for static content (including streaming videos). I see that Nginx, Cherokee and Lighttpd are among the best (I am not considering non-open source or non-linux stuff here). So, which too choose? I know one cannot go wrong with any of the three (Nginx, Cherokee, Lighttpd). Lighttpd's development has evidently gotten slower than it was a good time ago. The documentation is pretty good for all the three, and hopefully, so are the resources (knowledge of these among the users of Stackoverflow/Serverfault sites, the web etc). Precisely, and noting point [2] and [3], if I am not wrong, I should either go with Nginx or Cherokee. I would love to see someone clarify these... is Cherokee just as fast (mb/s), performant (connections/s), and reliable (think downtime/restarting server) as Nginx for serving static content and load balancing, for small, medium to large (and really large) websites and applications? (Think, the size of YouTube, Apache or Facebook.) if the answer for the Q above is a big "hell, yes!" then, I should probably prefer Cherokee, right? Because, since I am a beginner, it would a lot easier to setup Cherokee as it has a graphical admin user interface + really good documentation. Yes? I could be wrong, I could be right. I put down what I know so that you can offer most relevant advise. Pardon if anything I've said is offensive.

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• nginx reverse proxy to apache mod_wsgi doesn't work

  - by user11243

  I'm trying to run a django site with apache mod-wsgi with nginx as the front-end to reverse proxy into apache. In my Apache ports.conf file: NameVirtualHost 192.168.0.1:7000 Listen 192.168.0.1:7000 <VirtualHost 192.168.0.1:7000> DocumentRoot /var/apps/example/ ServerName example.com WSGIDaemonProcess example WSGIProcessGroup example Alias /m/ /var/apps/example/forum/skins/ Alias /upfiles/ /var/apps/example/forum/upfiles/ <Directory /var/apps/example/forum/skins> Order deny,allow Allow from all </Directory> WSGIScriptAlias / /var/apps/example/django.wsgi </VirtualHost> In my nginx config: server { listen 80; server_name example.com; location / { include /usr/local/nginx/conf/proxy.conf; proxy_pass http://192.168.0.1:7000; proxy_redirect default; root /var/apps/example/forum/skins/; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } } After restarting both apache and nginx, nothing works, example.com simply hangs or serves index.html in my /var/www/ folder. I'd appreciate any advice to point me in the right direction. I've tried several tutorials online to no avail.

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• BIOS not detecting working SATA hard drive.

  - by Evan

  Some time ago my power supply died. It's a long story from then till now, but the important bit is that I ended up with a new hard drive and a new power supply. I tested to see if my original hard drive was still alive, and it booted and worked perfectly until I turned it off. When I started it again it would not boot. I bought new SATA cables, assuming that the one I had was not seating properly (it was cheap and wobbly), but no dice. Upon start-up I am presented with a message telling me to insert boot media into the selected drive or add a drive and restart. Neither the new or the old drive is detected by BIOS, my Vista install disk, or from my bootable Linux USB drive. When I remove all of the RAM the computer ceases outputting visual information, and upon reinstalling the ram and starting up again gives me a "failed overclock" error. So, does anyone have an idea as to what might be going on? I'm completely lost at this point.

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• Additional Security Measures for Syslog over SSH

  - by Eric

  I'm currently working on setting up some secure syslog connections between a few Fedora servers. This is my currently setup 192.168.56.110 (syslog-server) <---- 192.168.57.110 (syslog-agent) From the agent, I am running this command: ssh -fnNTx -L 1514:127.0.0.1:514 [email protected] This works just fine. I have rsyslog on the syslog-agent pointing to @@127.0.0.1:1514 and it forwards everything to the server correctly on port 514 via the tunnel. My issue is, I want to be able to lock this down. I am going to use ssh keys so this is automated because there will be multiple agents talking to the server. Here are my concerns. Someone getting on the syslog-agent and logging into the server directly. I have taken care of this by ensuring that syslog_user has a shell of /sbin/nologin so that user can't get a shell at all. I don't want someone to be able to tunnel another port over ssh. Ex. - 6666:127.0.0.1:21. I know my first line of defense against this is to just not have anything listening on those ports and it's not an issue. However I want to be able to lock this down somehow. Are there any sshd_config settings on the server that I can use to make it where only port 514 can be tunneled over ssh? Are there any other major security concerns I'm overlooking at this point? Thanks in advance for your help/comments.

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• Mysterious Windows 7 slowdown problem

  - by cletus

  I have a fairly beefy machine: Intel Q9450 8GB DDR2800 (4x2) Intel X25-M G2 80GB SSD Several other hard drives Windows 7 Ultimate 64 In the last month I've gotten a mysterious slowdown problem. When I start my IDE (IntelliJ IDEA) it usually takes about 20 seconds on the SSD. If my machine has been on for a day or two (as far as I can tell this is the only pattern) and I try to start the IDE, it brings my machine to a halt. CPU usage goes up to 25% per core (so it's basically 100% usage) and it takes up to 5 minutes to start. Other things I've noticed: iTunes will start to skip and stutter (my music is running off a second hard drive). The only persistent things I'm running are: AVG Anti-Virus Spybot (the slowdown predates this) Hamachi and Murmur (again the slowdown predates this) Apple Airport Base Agent HP OfficeJet 8500 driver/manager The browser I use is Chrome. I can't think why that'd be relevant but it's always on so I thought I'd mention it. When this happens I can't see a reason for it in the process list. No CPU hogs. No spikes in IO activity that I can see. Basically I'm at a loss to explain it and need to reboot, at which point everything returns to normal (for awhile). FWIW the Intel SSD is about 75-80% full. I know being too full can really degrade performance. I don't believe that's the issue here. Does anyone have any ideas on what I can do to fix this or at least help find what's going wrong? This same machine (sans SSD) could run Win XP and stay up fine for a month or two.

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• Router not connecting to the internet

  - by Peter

  I had a weird problem this morning with my router - it's an Alice Gate VoIP 2 Plus WI-FI - not connecting to the internet after more or less 1 hour online (I'm always connected with the ethernet cable). The led status lights for Power, WI-FI, ADSL, Internet, Service should be on in order to be connected and navigate online. The problem was that the leds ADSL, Internet were off and I did not know why because it never happened before. I looked at the stats in the settings and the numbers for Bytes/Packages for both Sent/Received were there and increasing but I couldn't connect to the internet. I called tech support, they checked and told me to keep the router on for 48 hours because they were checking it. I've reset it twice before and after I called tech support and it still did not work so after about 2 hours of waiting I tried connecting using WI-FI and the leds 'magically' turned on, first the ADSL and Internet(Internet led always turns on last). At this point I'm curious what could of caused this and I'm doubting that the tech-support guys did something. What could of been the problem with the ethernet cable not connecting in the first place? It always works. What do the tech support guys normally do when they tell me to keep the router on so they can 'check it'? PS: I'm using ubuntu 32 bit

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