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• Nagios and rrd on a old server

  - by Pier

  I have an old server (P4 based) on which nagios (and all the other tools to monitor) is running. In the last few weeks we are seeing a strange behavior. In the /var/spool/pnp4nagios (where temporary files are stored before getting processed by pnp4nagios daemon) we have many files like perfdata.1274949941-PID-18839 and we get an error in npcd.log: [05-27-2010 11:17:46] NPCD: ThreadCounter 0/15 File is perfdata.1274951306-PID-27849 [05-27-2010 11:17:46] NPCD: File 'perfdata.1274951306-PID-27849' is an already in process PNP file. Leaving it untouched. Sometimes some graph are not drawn. The server is pretty loaded (around 5-6 normally) and i suspect that npcd goes in timeout and leave those files behind. What could I do (apart from change the server)? Few infos about the system: centos 5.5 nagios 3.2.1 pnp4nagios 0.6 (from sources) Thanks

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• MySQL replication/connection failing over SSL

  - by Marcel Tjandraatmadja

  I set up two MySQL servers where one is replicating from the other. They both work perfectly, but once I turn on SSL I get the following error: ERROR 2026 (HY000): SSL connection error I get the same error running from command line like so: mysql --ssl=1 --ssl-ca=/etc/mysql/certificates/ca-cert.pem --ssl-cert=/etc/mysql/certificates/client-cert.pem --ssl-key=/etc/mysql/certificates/client-key.pem --user=slave --password=slavepassword --host=master.url.com Both MySQL servers are running on version 5.0.77. There is a difference that MySQL in the master server was compiled under x86_64 while in the slave server under i686. Also both machines are running CentOS 5. Plus I generated certificates as per this page. Any idea for finding a solution?

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• Tab title is wrong with ssh/screen on osx

  - by sds

  I am doing ssh -t host screen -D -RR in OS X (10.9) terminal tabs. My ~/.screenrc is identical on all remote hosts and contain the following line: hardstatus string "%H(%n:%t)$USER %h" My ~/.bashrc is also identical on all hosts. When I login to host host_u (Ubuntu 12.04.3 LTS) running Screen version 4.00.03jw4 (FAU) 2-May-06, the tab title on the OS X terminal is host_u(1:bash)sds ~, as expected. When I login to host host_c (CentOS release 6.3 (Final)) running Screen version 4.00.03 (FAU) 23-Oct-06, the tab title on the OS X terminal is ~/FooBar (which is the local OS X directory from which I ran the ssh/screen command. Problem: the hardstatus line does not work on host_c.

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• Manage MS SQL server over SSH (putty)

  - by adopilot

  There is great implementation of PuttY for Symbian S60 devices, and last versions of Nokia phones with full QWERTY keyboard offers comfort for using Putty and SSH goodies. I start wondering is there a way to access MSSQL over SSH and send T-SQL commands. I am able to connect my router which running on FreeBSD OS, also other CentOS server with MYSQL are able to me over SSH. I want to try access MS-SQL-2005 from my mobile phone, Probably this is not going to have daily use, it is just for geeky and justification to myself: why I had to buy so expensive a toy

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• Ask a DNS server what sites it hosts - and how to possibly prevent misuse

  - by Exit

  I've got a server which I host my company website as well as some of my clients. I noticed a domain which I created, but never used, was being attacked by a poke and hope hacker. I imagine that the hacker collected the domain from either hitting my DNS server and requesting what domains are hosted. So, in the interest of prevention and better server management, how would I ask my own DNS server (Linux CentOS 4) what sites are being hosted on it? Also, is there a way to prevent these types of attacks by hiding this information? I would assume that DNS servers would need to keep some information public, but I'm not sure if there is something that most hosts do to help prevent these bandwidth wasting poke and hope attacks. Thanks in advance.

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• Forward the Wan IP to another Wan IP without changing the source address

  - by user195410

  I have tried this case by using the NAT function in iptables but fail example. PC A IP is 1.1.1.1 (Win7) My Server IP is 2.2.2.2 (CentOS 6.2) target Server B is 3.3.3.3 (Windows server 2003) Flow: PC A WanIP -- My Server A -- Server B (WanIP) My iptables rules: 1. iptables -t nat -A PREROUTING -d 2.2.2.2 -p tcp --dport 80 -j DNAT --to-destination 3.3.3.3:80 2. iptables -t nat -A POSTROUTING -d 2.2.2.2 -j MASQUERADE finally, i can access server B website by enter 2.2.2.2:80 but when i checked the access log at Server B i found it's source address had been changed to src:2.2.2.2 dst:3.3.3.3 please help me to do how to get the real address is src:1.1.1.1 dst:3.3.3.3

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• Sending mail in localhost:25 with Ssmtp

  - by Juan

  I already have Ssmtp installed and working in a Centos 5.7 machine with Gmail configured. I can send mails in th shell without problems. Now i want to use the ssmtp to allow a web app (installed in the same machine) to send mails but for do this i have to find a way to ssmtp "hears" in the port 25 (or any other). There is a way to do this? There is another simple alternative to ssmtp who allows to send mail using localhost:25? Thanks.

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• PostgreSQL: performance descrease due to index bloatper

  - by Henry-Nicolas Tourneur

  I'm running a PgSQL 8.1 on a CentOS 4.4 system (not upgradable unfortunately). There's a Java app running on top of the PgSQL daemon and we got to reindex the database every 2 months or so. Also important: the database isn't growing. It looks like the bloat is now coming faster than before and this tends to increase. My config is available here, autovacuum daemon is enabled and running quite often: pastebin.com/RytNj7dK You can also find the output of this query wiki.postgresql.org/wiki/Show_database_bloat 3 hours after running reindex: http://pastebin.com/raw.php?i=75fybKyd 72 hours after running reindex: http://pastebin.com/raw.php?i=89VKd7PC Does anyone have any idea what should I tweak to get rid of that growing bloat? Thanks for your help PS: due to antispam prevention system, I had to remove the first 2 http:// prefixes for my two first links.

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• Cannot see http (apache) server outside home network

  - by user165155

  Ive been racking my brain with this all evening. Power went out with a tstorm today, started back up my server... running apache and a team speak server on it. TS is great, cant see my web page outside my network! Firewall is disabled on the pc running it (centos btw), apache is running and working. correct ports are forwarded on my router (my isp blocks port 80). Ive tried changing ports, pretty much everything i can think of. httpd.conf is pointing to the correct addy and port, and my domain is pointing to the correct external ip. Im at a loss, any ideas out there?

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• Loggon to Internet Hotspot from within Linux Terminal

  - by Saif Bechan

  For internet I use a local Hotspot service. I have internet when I start my browser and fill in my username and password. This stays as long as I do not shut down my PC for a while. I run some virtual machines, centos, debian, from the command line. I run these just for small test purposes, nothing special, and security is not an issue for me at all. I want to have these VM's connect directly to the hotspot if this is possible. So they each have there own IP. I have enough hotspot accounts to do so. I can do this with a bridged connection in VMware which works find with a GUI. But I run these OS's from the command line. I only need to know a way how to get the hotspot to validate my credentials. Is there a way of doing this without having a gui.

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• What is the best package repository for Debian ?

  - by Dan Sosedoff

  Hello everybody I have a question regarding packages repository in Debian (Lenny). A new server at rackspace cloud service comes with nothing (plain system) so i had to upgrade system and install all necessary packages by myself. But the problem is that default repositories does not provide newer versions of software i need (PHP is 5.2.6, comparing to 5.2.13). In CentOS i used to get all new packages from third-party sources, which works really well till now. I have talked to guys from rackspace about it and looks like they cant provide anything except kernel headers. And i dont really want to build from source. So, whats the way to get newer software ? Any good third party sources? Thanks.

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• Apache is running; however, it reports that it is not, and it will not restart.

  - by solo

  Apache is running; however, it reports that it is not, and it will not restart. # /etc/init.d/httpd status httpd.worker is stopped # /usr/sbin/lsof -iTCP:80 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME httpd.wor 1169 root 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1211 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1213 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1215 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1352 daemon 3u IPv6 2974 TCP *:http (LISTEN) #/etc/init.d/httpd restart Stopping httpd: [FAILED] Starting httpd: [Wed Mar 24 10:33:51 2010] [warn] module proxy_ajp_module is already loaded, skipping (98)Address already in use: make_sock: could not bind to address [::]:80 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs [FAILED] OS: Linux DISTRO: CENTOS 5 Restarting the server didn't help, nor did killing apache and starting it. Any idea what is causing this inconsistency?

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• Compiling the Linux kernel, how much size is needed?

  - by ant2009

  I have downloaded the newest most stable Linux kernel, 2.6.33.2. I thought I would test this using VirtualBox. So I create a dynamically sized harddisk of 4 GB. And installed CentOS 5.3 with just the minimum packages. I setup the make menuconfig with just the default settings. After that I ran make and got the following error: net/bluetooth/hci_sysfs.o: final close failed: No space left on device make[2]: *** [net/bluetooth/hci_sysfs.o] Error 1 make[1]: *** [net/bluetooth] Error 2 make: *** [net] Error 2 The amount of space I have left is: # df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 3.3G 3.3G 0 100% / /dev/hda1 99M 12M 82M 13% /boot tmpfs 125M 0 125M 0% /dev/shm My virtual size is 4 GB, but the actual size is 3.5 GB. $ ls -hl total 7.5G -rw-------. 1 root root 3.5G 2010-04-13 14:08 LFS.vdi How much size should I give when compiling and installing a Linux kernel? Are there any guidelines to follow when doing this? This is my first time, so just experimenting with this.

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• yum / rpm / make | When to use which one

  - by Saif Bechan

  I am new to Linux and am running CentOs. When I want to update or install certain software I came across three ways. Sometimes it's: yum install program rpm -i program.rpm wget program.tar.gz unpack ./configure make make install That last one is a real pain, esp when you come from windows where a program install is usually one click and then a nice guide. Now can someone please explain to me: Why are there so many different ways to do this? Which one do you recommend to use and why? Are there any other ways for installing programs?

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• Monitoring Maximum Process Network Activity

  - by user125973

  We have a collocated server on which we run some OpenVZ hosts. Recently, we have had to pay a lot extra we keep exceeding our bandwidth quota. Our quota is 5 Mb/s but we have spike to almost 50. I looked at the graphs and there are some spikes happening at some intervals. I want to know which process is causing this so I need a tool that monitors the processes and gives me the one with the maximum instant traffic (It doesn't matter how much traffic we have as long as we don't exceed the 5Mb/s quota). Does anyone have a recommendation for this? My hosts are CentOS 5 with OpenVZ so I can see all the containter processes from the host, if that helps in any way.

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• Start a screen through svcadm with Solaris 11

  - by Sephreph

  I am running into a problem when trying to start a detached screen through a Solaris 11 service. This service controls nginx. When I reboot the system, the screen doesn't start, but if I issue svcadm disable nginx then svcadm enable nginx manually, it does. The rest of the init script functions correctly on a reboot (the nginx daemon starts, etc). The part of the service that triggers the screen looks like this: case "$1" in start) echo "Starting Nginx Logger: \c" /usr/bin/screen -S nginxLogger -d -m /opt/php-5.3.10/bin/php $loggingProg LogRetVal=$? [ $LogRetVal -eq 0 ] & echo "ok" || echo "failed" .... The log (/var/svc/log/network-nginx\:default.log) shows that $LogRetVal is returning 0, and $loggingProg is just pointing to a PHP script. If it matters, when I manually restart the service, I'm logged in as root. I'm unsure how to check if it's a permission issue (I'm new to Solaris, I've recently switched from CentOS/RHEL).

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• VPS nameserver setup?

  - by user41010

  Hi, I bought a VPS a few days back and had a domain name registered. It gave me 2 nameservers. I only have shell access (no Cpanel/WHM) and it's running CentOS 5. I can visit my site with http://IP/ but not with http://domain.com. What changes do I need to make so that I can visit my site with http://domain.com. I'm really new at this and any help would be greatly appreciated. Thanks.

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• Subversion problem, repo has moved

  - by Rudiger

  Hi, I've set up subversion on a CentOS fresh install. Web view works fine and gives no errors and requests password but when I try and access it through svn client (xcode) it gives the error 175011 (Repository has been moved). I've tried some of the solutions out there but no success. My subversion.conf: <Location /repos> DAV svn SVNParentPath /var/www/html/repos # Limit write permission to list of valid users. # Require SSL connection for password protection. SSLRequireSSL AuthType Basic AuthName "Authorization Realm" AuthUserFile /etc/svn-auth-conf Require valid-user </Location> My Apache DocumentRoot: /var/www/html I've only set up one svn repository so far so there shouldn't be any conflicts there. If you need any more info let me know. Thanks

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• Help about NAT with virtual server

  - by Thanh Tran

  I have a dedicated server running Linux CentOS 5.3 with 2 IP addresses. I've installed a virtual machine using VMware Server. The host and the guest have a host-only network. Now I want to map the 2nd IP address to the virtual machine so that it can run as a second dedicated server for me. Here is what I do: modprobe iptable_nat echo "1" > /proc/sys/net/ipv4/ip_forward iptables -t filter -A FORWARD -s 192.168.78.128 -d 64.85.164.184 -j ACCEPT iptables -t nat -A PREROUTING -d 64.85.164.184 -i eth0 -j DNAT --to-destination 192.168.78.128 iptables -t nat -A POSTROUTING -s 192.168.78.128 -o eth0 -j SNAT --to-source 64.85.164.184</p> But it not working as intended. What is the matter?

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• Where does Rundesk execute local tasks from

  - by Leon Stafford

  I'm trying to interact with the nodejs Azure sdk from a CentOS installation of Rundeck. If I try from the "run" adhoc virtual shell, I am able to after running azure account import <mykey> and can then also execute other Azure commands inside of jobs if I set them as Rundeck node tasks and not selecting "dispatch to nodes" in the job settings. Trying to run the Azure sdk commands as commands to be dispatched to the node (local) fails with the error: localhost1-NodeDispatch-localexec 04:53:04 /usr/bin/env: node: No such file or directory 04:53:04 Failed: NonZeroResultCode: Result code was 127 I am not able to "jumpstart" the same environment by running azure account import <mykey> I am assuming this is a permissions/environmental issue, though not sure how to fix it. UPDATE: Executing whoami from the same job returns rundeck, so I assume I will need to either modify that to execute tasks as my system user or grant permissions to get the rundeck user into the node environment the Azure sdk is running in?

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• MySQLi Extension with phpMyAdmin

  - by user1062058

  I just unpacked the latest phpMyAdmin into /var/www/html/phpMyAdmin and it is giving me "The mysqli extension is missing." - how do I install this? I'm on Centos. I checked php.ini and it seems to be "unlocked". when I type in php -i |grep -i mysqli ... it looks to be enabled. Also this is PHP Version 5.3.8 php -m apc ctype curl date dom filter ftp gd hash iconv json libxml mcrypt memcache mysql mysqli openssl pcre PDO pdo_sqlite posix REflection session SimpleXML soap SPL SQLite standard tokenizer xml xmlreader xmlwriter zlib Thanks.

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• objectClass in openldap.

  - by garden air

  I am working on openldap in my linux box (centos) as testing.I create a base file to discuss with you about objectClass functionality & its impact if we not write.I write objectClass two times i.e top and domain .What does it mean ? The 2nd one is drived from the firect objectClass like parents child relation ? [root@srv1 openldap]# vim base.ldif base.ldif dn: dc=test,dc=local dc: test objectClass: top objectClass: domain Now I create add two OUs and does not add objectClass:top in both sales and marketing. To add two OUs i.e Sales and Marketing dn: ou=Sales,dc=test,dc=local ou: Sales objectClass:organizationalUnit dn: ou=Marketing,dc=test,dc=local ou: Marketing objectClass: organizationalUnit The confusion is should use all the parent objectClass and chield objectClass ? If we not add what impact will be on the structure ? In the following I use objectClass top and organizationalunit dn: ou=Sales,dc=test,dc=local ou: Sales objectClass: top objectClass:organizationalUnit dn: ou=Marketing,dc=test,dc=local ou: Marketing objectClass: top objectClass: organizationalUnit Please guide me which one is correct ? thanks garden

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• How to Enable geoip on magento with varnish page cache

  - by molleman

  I currently have 3 stores online with 3 different domains, running magento with Apache and varnish (using Phoenix page cache extension) running on centos One store is for uk, another for Ireland and another for USA Trouble is (Example) If an US user hits the uk store , I would like the user to be notified to go to the correct store on the page, (I do not want them automatically redirected) I was able to php-pecl-geoip with maxmind database to get this to work, but as users on my website have increased I had to begin using varnish. how could I implement this functionality on with varnish so I know what country the user is from so I can display a message to the user to view their relevant website?

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• arcserve vs backup exec vray

  - by Luigi

  I have to buy one backup software to backup a vmware environment with the following server/applications: mixed microsoft windows 2003/2008/2012 server standard environment sql server 2005/2008 mixed linux centos/ubuntu servers postgresql sap environment exchange 2007 linux fileservers windows fileservers active directory random applications/sqlserver/fileserver on workstations xp/7/8 my hardware is: 5 blades on ibm bladecenter, various san, lto4 on 4gbit fiber channel connected to a windows2003 blade where I will install the backup software (backupexec or arcserve). What are your advice and comments over backupexec vray or arcserve choice ? I know that arcserve have a lower price. I used backup exec for some years but I found it pretty complicated. Thank you.

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• I want to replace Windows Server by Samba 4 for authentication purpose [closed]

  - by garden air

  I am using windows Server 2008 in a mediam size organization. I have 200 clients at the moment. I have learn that Samba4 has a remarkable changes for windows clienmts. I want to use Samba 4 to authenticate my windows xp and windows 7 clients machines. In my home based pc I am using vmware to test samba 4. For that purpose I am using CentOS 6.3 with Samab4. Kindly guide me taht it is possible that I replace windows server as a PDC controller and use samba4 to onlu authenticate my clients. I does not want Group Policy only and only authentication . So what u suggest me. Is it good to use samba 4 instaled of windows server. thanks, gardenair

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