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• Why does Exim puts emails on hold if there are frozen messages in the queue?

  - by user51932

  I've a CentOS with CPanel server working as a SMTP server, which currently uses 20 different hostnames and IP addresses to deliver email for an email newsletter service. However, it's extremely slow in sending emails. It's sending like 10 emails per minute, which I check by running the "exim -bpc" command. What could be affecting this? One thing I'm supposing, is that there are frozen messages in the queue, which are slowing down the sending until they're sent out, and are putting new messages on hold. What are the most common reasons a message can get frozen? Also, would it be more efficient to use 20 different small VPSs to send out email rather than use one large VPS with the 20 different hostnames and IPs in it?

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• crontab still sending emails even with > /dev/null

  - by user2344668

  I have a crontab (root) that runs a script and output is set to /dev/null but I always get the emails whenever it runs. I only want to receive error emails. # Rackspace driveclient update (12pm MST) 0 12 * * * /root/scripts/driveclient-update > /dev/null The only way I can get it to turn off is to use /dev/null 2&1 but then I won't get error emails. This is happening on three different CentOS servers, two are 6.3 and one is 6.4. NOTE: I have read over and over that /dev/null is supposed to send stdout there and prevent the email if there is nothing but stdout from the script, so at works for at least some people; I cannot figure out why it is not working on these servers. Here's an example of where /dev/null is supposed to work: http://www.alphadevx.com/a/384-Suppressing-Cron-Job-Email-Notifications

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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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• exim sending mail to wrong mail server

  - by Chris Bull

  I have recently taken over management of a server running centos and whm. It has several websites and domains running under reseller accounts. Email has always been on a server at our actual office. I have recently changed our email from our local email server to gapps for business (our local email server was pretty archaic). However, when any email is sent from the web server (such as wordpress etc) to our domain - it still routes it to the IP of our old email server. I am not very familiar with WHM or exim so don't really know how to address this. Email to other domains works fine and the gapps is working perfectly. Any help is much appreciated.

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• Specific cron at time point [closed]

  - by ARTI

  I have a very specific task, but can't handle it. I am not a programmer and totally n00b on bash scritps. So the question is, how to create a cron job like this: Script A.sh could be called at any time by hands, and it should create cron job to run script B.sh once at the nearest time point. For example I will have 4 time points: 10.00pm, 10.15pm, 10.30pm, 10.45pm. So if trigger a script A.sh at 10.07pm it should creat cron job to run ONCE script B.sh at 10.15h, because 10.15h is the nearest time point in future. Is it possible? How can I write such script A.sh? I use Centos 6 It is very important and urgent for me. Thank you very much.

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• WHM Backup recommended?

  - by user77284

  I have a VPS (CentOS) with WHM, about 25 GB. It has about 20 accounts on it. I am looking to effectively back it up. My thoughts: Back it up with WHM Backup locally. Use Rsync to mirror it to another server. My questions: Is WHM Backup a good solution? How can I keep several backups while keeping a minimal amount of space? Is there a different solution, I should consider? I am not an expert, so I want something simple that works with minimal maintenance. Thanks.

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• Cant get sub-domain created by Plesk working

  - by RN.

  Apache 2.2 CentOS Plesk 9.x I am using Plesk to manage my domain names on my virtual host.and GoDaddy for DNS I have created a new sub-domain blog using Plesk. I can see the httpd.include for example.com has a new virtualhost entry - blog.example.com I can also see folders have been created for the subdomain blog vhost\example.com folder But when I try to go to blog.example.com in the browser- I get an error - basically the host is not getting resolved. My site - example.com is working fine otherwise Any idea what could I be missing ? I did try restarting the apache web server as well

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• Tools to manage bunches of servers

  - by Stan

  Platform: most of them are Windows Server 2003, some are CentOS 5 Say if there're many game servers, is there any tools for engineers to easily manage? Below are some requirements. allow RDP (remote desktop) to servers. has group/permission setting. Classify by different functionality. So for people has permission to access certain group, they don't need further enter pwd to RDP servers, the tool will automatically log on the server. log activities: history about who has log on what server. Thanks.

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• Linux mdadm software RAID 6 - does it support bit corruption recovery?

  - by user101203

  Wikipedia says "RAID 2 is the only standard RAID level, other than some implementations of RAID 6, which can automatically recover accurate data from single-bit corruption in data." Does anyone know if the RAID 6 mdadm implementation in Linux is one such implementation that can automatically detect and recover from single-bit data corruption. This pertains to CentOS / Red Hat 6 if those are different from other versions. I tried searching online but didn't have much luck. With SATA error rates being 1 in 1E14 bits, and a 2TB SATA disk containing 1.6E13 bits, this is especially relevant to preventing data corruption. Thanks!

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• Mail Secure & Stable Open Source Mail Server

  - by Fanar ALHAYALI

  I have asked question on http://stackoverflow.com/questions/9868426/i-need-to-know-which-email-server-i-have-to-use and someone tell me my question would be better on serverfault. I know that this is a common question and asked many times. but there are so many available mail servers that i am not able to decide the one. Kindly tell that which is the Secure, Stable and fast open source mail server for Centos or Redhat Server. Is there any guide which can be used to deploy the mail server with all its components e.g. smtp, pop3, imap, spam, calender server, antivirus, DNS Setting. Currently I'm using sun messaging V6 which installed on Solaris 10 and my boss ask me to make a report for the best mail server today in the marketing? I tried to have a look on Google but I couldn't find interesting information for my report. Any advice would be appreciated.

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• Someone try to hack my site, want to understand the log

  - by garconcn

  I have a wordpress site hosted on CentOS 6. After see the following access log, I checked the server, it seems ok. Can anyone explain what does this guy trying to do? Did they get what they want? I have disabled allow_url_include, and restricted open_basedir to web dir and tmp(/etc is not in the path). 190.26.208.130 - - [05/Sep/2012:21:24:42 -0700] "POST http://my_ip/?-d%20allow_url_include%3DOn+-d%20auto_prepend_file%3D../../../../../../../../../../../../etc/passwd%00%20-n/?-d%20allow_url_include%3DOn+-d%20auto_prepend_file%3D../../../../../../../../../../../../etc/passwd%00%20-n HTTP/1.1" 200 32656 "-" "Mozilla/5.0"

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• Looking for an open source real-time network analysis program

  - by JrSysAdmin

  Can somebody recommend an open source real-time network analysis program? What I'm looking for the program to do is display a graph of bandwidth usage by IP within our internal network that can quickly be viewed any time we need to (typically when we want to quickly find out who is utilizing high amounts of bandwidth and slowing down the network). We ideally simply want to hook up a monitor on the wall of our server room to a system whose NIC will be in permissive mode to log all network activity in a visual manner which can easily be seen and running 24/7. Prefer open source as I do not have a budget for this project and prefer open source projects in general. I'd also prefer for this to be available for CentOS but any linux distro or Windows OS would be acceptable. Thanks!

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• How do I find out when and by whom a particular user was deleted in linux?

  - by executor21

  I've recently ran into a very odd occurrence on one system I'm using. For no apparent reason, my user account was deleted, although the home directory is still there. I have root access, so I can restore the account, but first, I want to know how this happened, and exactly when. Inspecting the root's .bash_history file and the "last" command gave nothing, and I'm (well, was) the only sudoer on the system. How would I know when this deletion happened? The distro is CentOS release 5.4 (Final), if that helps.

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• Why is the "file" command get confused on .py files?

  - by pythonic metaphor

  I have several python modules that I've written. Randomly, I used file on this directory, and I was really surprised by what I saw. Here's the resulting count of what it thought the files were: 1 ASCII Java program text, with very long lines 1 a /bin/env python script text executable 1 a python script text executable 2 ASCII C++ program text 4 ASCII English text 18 ASCII Java program text That's strange! Any idea what's going on or why it seems to think python modules are very often java files? I'm using CentOS 5.2.

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• Top causes of slow ssh logins

  - by Peter Lyons

  I'd love for one of you smart and helpful folks to post a list of common causes of delays during an ssh login. Specifically, there are 2 spots where I see a range from instantaneous to multi-second delays. Between issuing the ssh command and getting a login prompt and between entering the passphrase and having the shell load Now, specifically I'm looking at ssh details only here. Obviously network latency, speed of the hardware and OSes involved, complex login scripts, etc can cause delays. For context I ssh to a vast multitude of linux distributions and some Solaris hosts using mostly Ubuntu, CentOS, and MacOS X as my client systems. Almost all of the time, the ssh server configuration is unchanged from the OS's default settings. What ssh server configurations should I be interested in? Are there OS/kernel parameters that can be tuned? Login shell tricks? Etc?

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• How do I get my 192.168.* Linux server accessible via http://hostname/?

  - by rfrankel

  (Sorry if this question isn't worded well and/or is duplicate. I'm not a networking guy and I'm probably not using the right terms...this also makes it hard to see if this has already been answered.) I'm running a CentOS server in VirtualBox, Windows host, and I can see access Apache-hosted pages at http://192.168.1.109/ from machines on my LAN. But what I'd like is for people to be able to type http://hostname/ ...both because it's easier and primarily because I'm not sure that local IP is static. I'm not really sure how to proceed - could someone point me in the right direction? Thanks.

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• PHPMyAdmin running very slow over internet but fine locally

  - by columbo

  I connect to PHPMyAdmin remotely on a Centos server using my local PC via Firefox. Usually it's fine but today it's really slow (2 minutes to load a page), sometimes timing out. Other connections to the server are fine. The SSH command line is as fast as ever as is the GNOME dekstop over SSH. In fact on the GNOME desktop I can run PHPMyAdmin locally from its browser and it's as quick as ever (which is a solution to the problem of course). I've checked the various log files and seen nothing unusual, I've logged into the MySQL command line and the database is running fine without any slowing what so ever. So it just seems to be slow when I access PHPMyAdmin on the server from the browser on my remote PC (I've tried IE and Firefox, both are slow). Has anyone experienced this or have any ideas what the issue could be. Connecting via CLI through tunnel works OK - problem is in phpMyAdmin for sure. Cheers

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• Setup mail server on VPS?

  - by user41010

  This is a n00b question, sorry. I have a site running on a VPS, now I want to be able to receive mails at [email protected]. How do I need to set up the server? And how should I set up the mail client on my PC to receive those mails? The server is running CentOS/RHEL. I'll really appreciate if someone shed some light on the steps that need to be taken. It will be really helpful. Thanks in advance!

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• Web Server Setup

  - by gustyaquino

  Hello, In my workplace, we want to implement your own web server for at leat 100 Apache/PHP/MySQL web pages. My boss is opposed to hiring skilled personnel, he think we can do ourselves. Currently, we are working with hostgator reseller account. I chose CentOS as the operating system, but I don't know the best hardware solution. HP, Dell ? What about the setup on these platforms? Thanks. PS: sorry for my bad english Edit: The purpose of this migration isn't related to performance issues. But independence.

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• How to make all of my IPs works in HyperVM XEN?

  - by user758667

  I've installed HyperVM on CentOS 5.8 final to make XEN VPS. I have 5 IPs, and added them to an IPPool. They are from *.123 to *.126. But when I add Virtual machines, just the first one (which indicate to *.123 ip) works well. I mean I can ssh to it by "works well" and when I want ssh to the other ones ( *.124 *.125 ...) it says : ssh: connect to host *.124 port 22: Connection timed out after a while. I alos set gateway and netmask as it shows in my server IPAdresses for device eth0 (it doesn't make any difference if I set these or not, I get same error). What should I do now? Thanks.

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• Can I split one RAID1 partition in two?

  - by Prosys

  I have a linux box with CentOS 6.2 and a RAID1 (2x 2Tb) configuration: /dev/md1 -> / (10G) /dev/md2 -> /home (1.9T) I want to split the md2 in two different partitions, so I can get the following configuration: /dev/md1 -> / (10G) /dev/md2 -> /home (1T) /dev/md3 -> /example (900G) How can I achieve this? I already know that I can resize the partition, but that doesn't alter the real partition table (only the md device), so how can I do this?

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• Iptables - Open Port Only for one Server IP (allow connections from a specific range)

  - by user1015314

  My server has multiple IPs, 1.1.1.1 1.1.1.2 and i have a service which listens to a port e.g. 88 Now i want, when somebody from outside, wants to connect to the port, that he can only connect, to that port, if he connects to the ip 1.1.1.2:88 but if he tries to connect to 1.1.1.1:88 it should not react and it should look like that it dont exists and drops all connections. Ok, than i need for 1.1.1.2:88 that only allows a specific ip range outside connecters. for example only 9.*.*.* can connect to that port and ip. I'm using Centos. Thank you for your help.

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• What is a Dynamic way to Connect to a Virtual Machine's Webserver from its Host Machine? [closed]

  - by Jonnybojangles

  As a Web-Developer what is the most efficient (automated) way to connect to a Virtual Machine (VM) running a development webserver from it’s Host Machine (the machine running the VM) when you do not have control over the networks (home, Startbucks, work, etc) you are connected to? Currently I start my VM (a VirtualBox VM running CentOS), run ifconfig to determine the VM’s current IP. I then take that IP and map it my Host machine’s host file so that I can access the VM’s webserver from the Host. I feel that this is not an efficient way to connect to my VM’s webserver because each time I connect to a new network (a few times a day) I need to repeat the IP look up and host file update, and sometimes restart the VM's network service.

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• Apache httpd + FreeTDS hangs until restarted

  - by Jordan Reiter

  Every so often requests to a Linux server (say, linux.example.org) where the web app (Django) pulls in data from a SQL Server database via FreeTDS will hang. Requests on other servers pointing to the database still work, as do requests on linux.example.org that use local MySQL databases. Only the server plus FreeTDS appear to be affected. Restarting httpd makes the database connections work correctly again. What could cause this problem? Using: Centos 5.9 freetds 0.91 Apache httpd 2.2.3 /etc/obdc.ini: [DSN] Description = SQL Server 2005 Driver = FreeTDS ;Database = dbname Servername = SERVERNAME ;TDS_Version = 8.0 /etc/freetds.conf: [SERVERNAME] driver = /usr/lib64/libtdsodbc.so host = db.example.org port = 1433 tds version = 8.0 client charset = UTF-8

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• What is the best way to shutdown hard disk?

  - by Sunil

  Right Now I'm using hdparm command in unix to shut down the hard disk but there are few issues with it. when it wakes back up it consumes lots power. Is there any other way to do it? Many times when I put my hard disk to sleep, I can see few bursts at the beginning and then after a while it goes to sleep. I think its because of the journaling system in ubuntu (which I use) Have anybody encountered that? What would be the best linux/unix operating system (eg: ubuntu/centos/redhat) to work on extensive hard disk operations? I would highly appreciate if you could share the problems you encountered while doing this operation.

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