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• cloud computing ? Eucalyptus

  - by neolix

  Hi Greeting!! I want to setup small cloud computing using our old 2 core server system? we are new to cloud system we have google for the same. We are looking host VM's on top any one has done pls share me doc or how to ? we have 50 plus server which we are not using. 2 core each 4GB RAM, 1TB HDD centos is my base os we looking host windows. Right now we can use this server only paravirtualization ignore my english Thanks

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• Weird behaviour/rendering of backspace in Terminal.app when SSHing into zsh

  - by Nils Riedemann

  Hi there, I just stumbled upon a weird problem. When I SSH into my server (centos, zsh) and I type some stuff and hit backspace It looks like a space - but internally it really deleted the characters. ls -l a Note that the space between land a is actually when I hit backspace. When I now hit return ls -a gets executed. This is only in zsh, in bash it works fine. Hope anyone has an idea what this is all about and how to fix this.

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• Simple one-way synchronisation of user password list between servers

  - by Renaud Bompuis

  Using a RedHat-derivative distro (CentOS), I'd like to keep the list of regular users (UID over 500), and group (and shadow files) pushed to a backup server. The sync is only one-way, from the main server to the backup server. I don't really want to have to deal with LDAP or NIS. All I need is a simple script that can be run nightly to keep the backup server updated. The main server can SSH into the backup system. Any suggestion? Edit: Thanks for the suggestions so far but I think I didn't make myself clear enough. I'm only looking at synchronising normal users whose UID is on or above 500. System/service users (with UID below 500) may be different on both system. So you can't just sync the whole files I'm afraid.

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• OpenLDAP User Home Directory

  - by Bo Zhou

  I'm trying to install OpenLDAP on CentOS 6.2 . I manually added the LDAP accounts on server, and I had been successful to login the server by the LDAP username/password, but I found that the Home on Desktop of GNOME still points to a local user's Home folder, at the same time, the LDAP user's Home folder was created under /home as expected. So my question is how should I map the Home folder of desktop to the path set on LDAP server ? Thanks ! And how should I use ldapadd command, it always tells me the SASL error, but I really do not know why. Thanks !

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• puppet service not stopping service

  - by Gregg Leventhal

  notice ("This should be echoed") service { "iptables": ensure => "stopped", } This does not stop iptables, I am not sure why. service iptables stop works fine. Puppet 2.6.17 on CentOS 6.3. UPDATE: /etc/puppet/manifests/nodes.pp node 'linux-dev' { include mycompany::install::apache::init include mycompany::config::services::init } /etc/puppet/modules/mycompany/manifests/config/services/init.pp class mycompany::config::services::init { if ($::id == "root") { service { 'iptables': #name => '/sbin/iptables', #enable => false, #hasstatus => true, ensure => stopped } notice ("IPTABLES is now being stopped...") file { '/tmp/puppet_still_works': ensure => 'present', owner => root } else { err("Error: this manifest must be run as the root user!") } }

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• Dedicated Server emails ending up in Junk

  - by Pasta

  I have a dedicated server that works fine. Recently I added a new domain with a new dedicated IP address. The emails from the webserver gets sent out from the primary IP address which is different from the IP address of the domain. This causes the emails to end up in the Junk email folders. Is there anything I can do changing the SMTP server to the new IP address or configuring send mail? I need this for my php server on centos.

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• SSL issue with emails

  - by JackWillDavis

  OK, so I have somebody hosting a site on my CentOS 5.8 Plesk 11 control panel. He has a EV SSL which is validating the site fine however he has failed the PCI check because it is saying his email servers (SMTP, IPAM, POP) have the wrong name on the servers. This is because his SSL certificate is not a wildcard certificate and the email servers are flagging the default Plesk SSL certificate. Is there a way to stop Plesk automatically connecting emails via the default SSL? I'm fairly new to things like this so I hope I've written everything I need, let me know if any more details are needed. Jack

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• FTP issue - VSFTPd and connecting to from FileZilla

  - by B Tyndall

  I'm trying to connect to a CentOS Linux box that I have hosted on EC2 and I think I have everything configured correctly but when I try to connect I get this series of messages Status: Connection established, waiting for welcome message... Response: 220 (vsFTPd 2.0.5) Command: USER tyndall Response: 331 Please specify the password. Command: PASS ********* Response: 230 Login successful. Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/home/tyndall" Command: TYPE I Response: 200 Switching to Binary mode. Command: PASV Error: Connection timed out Error: Failed to retrieve directory listing Not sure where to start troubleshooting this issue. Any ideas? Do I need to change any permissions? I would think this ID has the ability to see my own home directory. I am able to push/pull files from the command line version of FTP client working on Windows.

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• Python multithreading not working on VPS server

  - by Sabirul Mostofa

  I am running an python multithreaded application with multiple processes which scrapes data from some websites. While running on my localhost It works great, but on the vps server I am using( Centos 5.8, 2.6 GHZ with 4 cores) performs very slow. From the nethogs command I get the network usage too low. I get around 8KBps with 15 threads. On other hand, in my PC I get the usage around 100-120KBPS. I have read about the Python GIL and threading limitations. It seems GIL never releases the lock on the VPS though it should while doing I/0 Is there any configuration in the VPS that I need to change for the threading to work properly?

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• Apache security for multi-user development web server.

  - by mrmartinblue

  I've been searching and reading through documents all morning and understand that I need to use some combination of chown and probably 'jailing' to securely give programmers access to directories on my centos webserver. Here's the situation: I have an apache web server that has any number of virtual sites located in /var/www/site1 /var/www/site2 etc.. I have different developers that need full access both ssh and vsFTP to only the site they are working on. What is the best way to create and maintain security in this scenario. My thought would be to create a new user for each coder, jail that user to the website directory they are allowed to work in, add their user to a group and set the webroot's owner to that group. Any thoughts? Good, bad, ugly? Thanks!

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• Encrypt connection between apache web server and mysql server.

  - by microchasm

  I'm setting up a local webapp. I have a CentOS-5 box that will be the webserver (Apache 2.2). I have another box (RHEL5) that will be used only for MySQL. The data will be encrypted on the webserver via PHP before being sent to the MySQL box and inserted into the db. All web-based connections to the webserver will be encrypted via SSL. From the research I've done, it's not totally clear on whether or not there is a need to encrypt the connection to the db from webserver (NB paranoia level: Orange). If it is not overkill, or even if it is (unless it is a really bad idea for some reason), any advice or pointers on the direction to take to get this done would be appreciated.

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• Iptables based router inside KVM virtual machine

  - by Anton

  I have KVM virtual machine (CentOS 6.2 x64), it has 2 NIC: eth0 - real external IP 1.2.3.4 (simplified example instead of real one) eth1 - local internal IP 172.16.0.1 Now I'm trying to make port mapping 1.2.3.4:80 = 172.16.0.2:80 Current iptables rules: # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE -A PREROUTING -p tcp -m tcp -d 1.2.3.4 --dport 80 -j DNAT --to-destination 172.16.0.2:80 COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *mangle :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 But there is nothing works, I mean it does not forwards that port. Similar configuration without virtualization seems to be working. What am I missing? Thanks!

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• error on remote connection to mysql

  - by Ahmet vardar

  Hi, I ve been trying to connect my dedicated server mysql db from my computers localhost my code is here; $dbhost = 'domain.com'; $dbuser = 'username'; $dbpass = 'pass'; $conn = mysql_connect($dbhost, $dbuser, $dbpass) or die('Could not connect: ' . mysql_error()); $dbname = 'dbname'; mysql_select_db($dbname); I get that error Could not connect: Lost connection to MySQL server at 'reading initial communication packet', system error: 61 Dedicated server is Linux centos 64 bit, php 3.2.4, mysql 5.1.54 Is there any workaround that ? Thanks

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• FTP transfer timeouts while uploading small files

  - by Hamed Momeni

  I have this problem that when I need to transfer some files (mostly small files < 100KB) the connections time out. Well actually it uploads one file and it fails on the next until my client reconnects to the server and the same thing happens over and over again. I googled the problem and some said that switching from passive mode to active mode could solve the it but it didn't work for me. Even continuously pinging the server to keep the connection alive was to no avail. P.S. I have root access to the server. Update: I'm running ProFTPD on a CentOS vps. I tried a few clients (FireFTP, FileZilla) all having the same problem.

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• VPS for Glassfish

  - by Harry Pham

  Our small startup company plan to deploy a web application on Glassfish, I and wonder if some of the experience user out there can answer me couple question. When I shopping for server, I usually look at RAM amount, as GF does required good amount of RAM to run, below are the two sites with significant price different for the same amount of RAM. I wonder why?? Godaddy: http://www.godaddy.com/hosting/virtual-dedicated-servers.aspx?ci=9013 Versus http://entic.net/Servers Does below plan from Godaddy consider good to run GF application. OS: Linux CentOS • RAM: 4 GB • Storage: 60 GB • Bandwidth: 2,000 GB/mo Our web application is a social network, expected to have 2000-4000 users to start with

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• vPopmail / xinetd.

  - by Lorren Biffin

  I'm attempting to setup vpopmail on my CentOS server (Media Temple). Everything is working like a charm, with the exception that I cannot login to the server from any pop3 client. Upon trying to login I get the following error: Sending of password did not succeed. Mail server mail.(mydomain).com responded: Login failed. I'm running qmail (of course) with xinetd (not tcpserver). I've placed a file called pop3 into the folder /etc/xinetd.d with the content: service pop3 { disable = no socket_type = stream protocol = tcp wait = no user = root server = /var/qmail/bin/qmail-popup server_args = mail.(mydomain).com /home/vpopmail/bin/vchkpw /var/qmail/bin/qmail-pop3d Maildir log_type = FILE /var/log/xinetd.log log_on_success = HOST log_on_failure = HOST RECORD } Can anybody offer any guidance here? I've been unsuccessfully trying to make this happen for over a week.

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• MySQL replicate multiple places

  - by Frederik Nielsen

  Very trick task to find a good title for this question, but here goes the q: I have a few development machines, where I develop my PHP applications on, and testing via a local webserver. This works out pretty well for each machine. However, I would like to replicate the DB from my machines to a central location. So, to sum up: DEV1 - CENTRAL DEV2 - CENTRAL DEV3 - CENTRAL CENTRAL - DEV1 CENTRAL - DEV2 CENTRAL - DEV3 I hope this makes sense, as I cannot find an easy way to tell it. Basically, it is a 2-way replication, where all 4 databases contain the same info, and each of them can be updated locally, to then be pushed out to the others. Is this actually doable? All my dev machines are running Windows 7, and my central DB server is running CentOS 6.

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• Nginx/FPM/PHP all php files say 'File not found.'

  - by Boon

  i just installed nginx 1.1.13 and php 5.4.0 on a centos 5.8 final 64bit machine. Nginx and PHP/Fpm are running, and I can run php scripts via ssh command line, but in the browser I keep getting 'File not found.' errors on all my PHP files. This is how I have my nginx.conf handle PHP scripts: location ~ \.php$ { root /opt/nginx/html; fastcgi_pass unix:/tmp/fpm.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /opt/nginx/html$fastcgi_script_name; include fastcgi_params; } This is a direct copy/paste from my other servers, where it works fine with this setup (but they run older versions of php/fpm). Why am I getting those errors?

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• Outgoing mail from linux not being delivered

  - by Jason

  I can't seem to send mail through my php scripts or through the linux console on my Centos 5.5 LAMP server, when the email is addressed to go to a domain that is hosted by my box. I think it is something to do with the email routing internally, or the DNS servers that the box uses not reporting the correct MX records. Basically my box doesn't host any mail, it's all hosted on google apps. My name servers are hosted by a 3rd party provider and I am using webmin. Webmin doesn't recognise the settings on the 3rd party provider. I'm unsure how to fix this. Previously when I had this problem on a cpanel server, I would edit the remotedomains and localdomains files, moving domains from one file to another and it would fix the problem. What information do I need to provide for anyone to work out what the issue is? Thanks

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• sasl and tls with dns load balancing

  - by achal tomar

  I am using DNS load balancing in my centOs 5 server.The mail sent to the load balancer server are balanced by sending them to 4 more servers who then pass the mails to their destinations in the network.The mails are generated by a Php script which gives all the mail to the load balancer server. Now i want sasl and tls authentication in the load balancer server so that i can prevent the mail server from spammers,Can anyone tell me how to do this. The load balancer pass the mails to other servers based on equal mx record preference,so i want sasl authentication with Dns load balancing.

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• Starting with administering a linux box

  - by Josh K

  I'm rather new to this, and I'd like to play with administering a linux box. Things I need to know how to do: Setup subdomains Setup FTP accounts Setup full domains / add domains MySQL setup / install / management LAMP setup / install / management This is probably going on a CentOS distro. I'd like links or a break down on how I can learn to do this. I am comfortable with a command line, but I'm trying to move from shared hosting to a VPS and would like to have some idea on how deep the water is before I do.

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• curl installation and upgrade

  - by user26202

  On a centos 5.7 machine we had curl 7.15 installed . We also have PHP installed in it as some of the PHP libraries are linked to curl. We wanted to upgrade curl to 7.19 but yum update was failing . Then we manually installed 7.19 with the sources. Now we have two curl versions /usr/bin/curl points to 7.15 /usr/local/bin/curl points to 7.19 And PHP still uses curl 7.15 .How to do delete curl 7.15 without removing the dependency (like PHP and make PHP start using curl 7.19?

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• rm command not ask before delete

  - by apis17

  i have centos VPS created using XEN + OpenVZ virtualization. -bash-3.2# uname -a Linux host.domain.com 2.6.18-274.7.1.el5.028stab095.1xen #1 SMP Mon Oct 24 22:10:04 MSD 2011 i686 i686 i386 GNU/Linux there are no question asked when i want to delete file(s) -bash-3.2# vi test.txt -bash-3.2# rm test.txt -bash-3.2# the main server (not virtualized one) is asking me first before delete any files. [root@main ~]# vi test.txt [root@main ~]# rm test.txt rm: remove regular file `test.txt'? y [root@main ~]# how to configure virtualized environment to prompt me before deleting any file(s)? thank you.

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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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• How to recover data from software RAID 5 disk partition

  - by Ali n

  I have CentOS 5.8 on my computer, with 5x 1TB hard drives. I used software RAID. (RAID 1 as a boot partition md0, RAID 0 as a root partition md1 and RAID 5 as /home partition md3). Unfortunately one of these hard drives failed lately and I want to replace it with a new one. I want to know that is it possible to change this hard drive without data loss? The important partition is RAID 5 so in theory if one of hard drives failed I should be able to recover its data without any problem. But in practice how can I do that?

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