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• Hadoop Rolling Small files

  - by Arenstar

  I am running Hadoop on a project and need a suggestion. Generally by default Hadoop has a "block size" of around 64mb.. There is also a suggestion to not use many/small files.. I am currently having very very very small files being put into HDFS due to the application design of flume.. The problem is, that Hadoop <= 0.20 cannot append to files, whereby i have too many files for my map-reduce to function efficiently.. There must be a correct way to simply roll/merge roughly 100 files into one.. Therefore Hadoop is effectively reading 1 large file instead of 10 Any Suggestions??

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• Weird nfs performance: 1 thread better than 8, 8 better than 2!

  - by Joe

  I'm trying to determine the cause of poor nfs performance between two Xen Virtual Machines (client & server) running on the same host. Specifically, the speed at which I can sequentially read a 1GB file on the client is much lower than what would be expected based on the measured network connection speed between the two VMs and the measured speed of reading the file directly on the server. The VMs are running Ubuntu 9.04 and the server is using the nfs-kernel-server package. According to various NFS tuning resources, changing the number of nfsd threads (in my case kernel threads) can affect performance. Usually this advice is framed in terms of increasing the number from the default of 8 on heavily-used servers. What I find in my current configuration: RPCNFSDCOUNT=8: (default): 13.5-30 seconds to cat a 1GB file on the client so 35-80MB/sec RPCNFSDCOUNT=16: 18s to cat the file 60MB/s RPCNFSDCOUNT=1: 8-9 seconds to cat the file (!!?!) 125MB/s RPCNFSDCOUNT=2: 87s to cat the file 12MB/s I should mention that the file I'm exporting is on a RevoDrive SSD mounted on the server using Xen's PCI-passthrough; on the server I can cat the file in under seconds ( 250MB/s). I am dropping caches on the client before each test. I don't really want to leave the server configured with just one thread as I'm guessing that won't work so well when there are multiple clients, but I might be misunderstanding how that works. I have repeated the tests a few times (changing the server config in between) and the results are fairly consistent. So my question is: why is the best performance with 1 thread? A few other things I have tried changing, to little or no effect: increasing the values of /proc/sys/net/ipv4/ipfrag_low_thresh and /proc/sys/net/ipv4/ipfrag_high_thresh to 512K, 1M from the default 192K,256K increasing the value of /proc/sys/net/core/rmem_default and /proc/sys/net/core/rmem_max to 1M from the default of 128K mounting with client options rsize=32768, wsize=32768 From the output of sar -d I understand that the actual read sizes going to the underlying device are rather small (<100 bytes) but this doesn't cause a problem when reading the file locally on the client. The RevoDrive actually exposes two "SATA" devices /dev/sda and /dev/sdb, then dmraid picks up a fakeRAID-0 striped across them which I have mounted to /mnt/ssd and then bind-mounted to /export/ssd. I've done local tests on my file using both locations and see the good performance mentioned above. If answers/comments ask for more details I will add them.

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• sendmail appends server name to external domains when relaying

  - by Chris

  My server is set to send all email to a corporate relay server. For the company domain, it works perfectly. I've recently found emails being sent to an outside domain are getting the hostname of my server appended to the email prior to being sent. Here is the log entry for one such attempt. Nov 6 09:46:45 myservername sendmail[45023]: rA6EkjiI045023: [email protected], delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30590, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (rA6Ekj2g045037 Message accepted for delivery) Nov 6 09:46:45 myservername sendmail[45061]: rA6Ekj2g045037: to=<[email protected]>, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=120885, relay=relay.company.com [x.x.x.x], dsn=2.0.0, stat=Sent (ok: Message 342335947 accepted) Notice the email address difference between it being accepted by my server for delivery (correct email address), and being sent and accepted by the corporate relay (incorrect with server name appended). To make it more interesting, the application on my server uses email for user account verification/activation. In August, this particular user was able to register his account and activate it. I have made no configuration changes to mail since setting the server up over a year ago. DNS is also a corporate service. I've never touched my /etc/resolv.conf configuration. domain company.com nameserver <ip1> nameserver <ip2> search myservername Thanks!

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• How does Heartbeat determine when to switch to the secondary? Can you force it to switch?

  - by John

  I've been trying to understand exactly how Heartbeat works - I understand how when one server dies, it switches to the backup. But, for me, it also switches when the primary has a large increase in workload. But, it doesn't always switch at the same value. There doesn't seem to much information on the web about how it works. The best I've found is this article. How does Heartbeat determine when to switch to the secondary, and how does it determine when it switch back to the primary? Is this an editable setting, and can I force it to switch between one and the other? Sometimes when Heartbeat will switch to the secondary, it takes a few days or I've even seen two weeks before it switches back to the primary. This is well after the primary traffic has gone down. I'm currently using BlueOnyx, and my Heartbeat settings are: Auto Failback: on Keepalive: 1 seconds Warntime: 10 seconds Deadtime: 20 seconds Initdead: 30 seconds

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• blocking port 80 via iptables

  - by JoyIan Yee-Hernandez

  I'm having problems with iptables. I am trying to block port 80 from the outside, basically plan is we just need to Tunnel via SSH then we can get on the GUI etc. on a server I have this in my rule: Chain OUTPUT (policy ACCEPT 28145 packets, 14M bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * eth1 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED And Chain INPUT (policy DROP 41 packets, 6041 bytes) 0 0 DROP tcp -- eth1 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED Any guys wanna share some insights?

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• Free Hosting control panel

  - by John Maxim

  Hello All, I'm in the mid of researching for one of the best hosting control panels. The server I run is Ubuntu and I have some experience with ISPConfig 2 & 3. Since I haven't explored any others available, what are the recommended ones for an Ubuntu server? I asked because I find that there seems to be some disabling and modifications required for an Ubuntu server if I need to use ispconfig which causes the server to change its actual way of running. It's quite good though, but any more recommended ones ? Something more organic? which doesn't require much breaking and changing. I'm not asking for the simple one, I don't mind going extra mile to install a powerful one but just try sticking with most Ubuntu's conventions will be an ideal one for me. And of course, if there happens to be something that meets the requirement as mentioned "Ubuntu conventions" and also simple to install at the same time, that'd be a bonus. Thanks in advance.

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• Setup Webmail server unable to receive mails

  - by user26516

  I installed centos and configured email server and if I send email goes perfectly but if i reply from email that email i am getting this kind of error. Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain example.com by mx00.1and1.com. [74.208.5.3]. I have bought domain in 1and1.com and i successful parked the domain. But i have doubt shall i need to add anything in MX record for other mail server. Please anyone help.

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• QNAP TS-419p as a VPN Gateway?

  - by heisenberg

  Hello, I am hoping one of you might be able to help. I want to make files stored on shared folders on a QNAP TS-409p available to users over a VPN link. How is the possible? Can someone explain what I need to do. What do I need to do at the router and what do I need to do on the QNAP NAS? Effectively, what I want do do is use the built in Windows vpn client to connect to my home network and then be able to browse the shared folders. Thanks in advance.

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• What is the best vfat driver for FUSE? (Lightweight, not mountlo)

  - by Vi

  FUSE filesystem list show some FuseFat and FatFuse. Both are old, FatFuse is read-only , FuseFat is non-buildable and probably depends on glib. Now I'm using mountlo for the task (mounting USB drives in generic way without root access or suid things (except of fusermount itself)), but it looks too big for such task. Is there good vfat FUSE driver?

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• Is there good FAT driver for FUSE? (Lightweight, not mountlo)

  - by Vi

  FUSE filesystem list show some FuseFat and FatFuse. Both are old, FatFuse is read-only , FuseFat is non-buildable and probably depends on glib. Now I'm using mountlo for the task (mounting USB drives in generic way without root access or suid things (except of fusermount itself)), but it looks too big for such task. Is there good vfat FUSE driver?

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• running a web server with encrypted file system (all or part of it)

  - by Carlos

  Hi, I need a webserver (lamp) running inside a virtual machine (#1) running as a service (#2) in headless mode (#3) with part or the whole filesystem encrypted (#4). The virtual machine will be started with no user intervention and provide access to a web application for users in the host machine. Points #1,#2 and #3 are checked and proved to be working fine with Sun VirtualBox, so my question is for #4: Can I encrypt the all filesystem and still access the webserver (using a browser) or will grub ask me for a password? If encrypting the all filesystem is not an option, can I encrypt only /home and /var/www ? will apache/php be able to use files in /home or /var/www without asking for a password or mounting these partitions manually? Thanks

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• Moving directories full of files over the top

  - by JavaRocky

  I took a backup of a directory which has a number directories and files inside them. Recently some files have gone missing. I would like to just move over the missing files. I prefer moving files instead of just copying as space is a premium on this particular box and the files are quite large. How can i achieve this?

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• File descriptor linked to socket or pipe in proc

  - by primero

  i have a question regarding the file descriptors and their linkage in the proc file system. I've observed that if i list the file descriptors of a certain process from proc ls -la /proc/1234/fd i get the following output: lr-x------ 1 root root 64 Sep 13 07:12 0 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 1 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 2 -> /dev/null lr-x------ 1 root root 64 Sep 13 07:12 3 -> pipe:[2744159739] l-wx------ 1 root root 64 Sep 13 07:12 4 -> pipe:[2744159739] lrwx------ 1 root root 64 Sep 13 07:12 5 -> socket:[2744160313] lrwx------ 1 root root 64 Sep 13 07:12 6 -> /var/lib/log/some.log I get the meaning of a file descriptor and i understand from my example the file descriptors 0 1 2 and 6, they are tied to physical resources on my computer, and also i guess 5 is connected to some resource on the network(because of the socket), but what i don't understand is the meaning of the numbers in the brackets. Do the point to some property of the resource? Also why are some of the links broken? And lastly as long as I asked a question already :) what is pipe?

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• I've executed a command "mv *.2 *" in home dir. How can I get my files back? :)

  - by life-warrior

  After executing command above, I've got all the files and dirs missing (except the hidden one). Where are they and how can I get them back ? Please help :)

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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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• Samba domain controller: remove 1 Windows client

  - by K B

  my domain is controlled by a Samba domain controller running on openSUSE 11.3. It manages other openSUSE boxes and some Windows 7 boxes. Now one harddisk of a Windows 7 computer crashed and I had to reinstall. I wasn't able to get the computer name ("Win26") of the broken PC out of the domain and so I couldn't add the reinstalled "Win26" to the domain again. So how can I remove the entry of the old "Win26" computer out of the domain controller, so that I can add the new "Win26" to the domain again? Is it one configuration file I have to edit and restart Samba? Which file would this be? Thanks in advance for your help! Regards, KB

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• Mark packets across computers?

  - by eudemo

  I use Transmission on Ubuntu and I'm having this issue, which basically says that QoS is broken because there is no way to limit which outgoing ports uses. I was thinking of doing a dirty and ugly hack and create an interface alias and define QoS based on source address, but was wondering if is there another way. Is it possible to mark the packets on the original machine in some way, using the owner and mark modules of iptables and sending this to the router who does the QoS? From what I understand, mark on iptables only applies to the local machine, so this will not work, but is there another way?

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• How to execute a command whenever a file changes?

  - by Denilson Sá

  I want a quick and simple way to execute a command whenever a file changes. I want something very simple, something I will leave running on a terminal and close it whenever I'm finished working with that file. Currently, I'm using this: while read; do ./myfile.py ; done And then I need to go to that terminal and press Enter, whenever I save that file on my editor. What I want is something like this: while sleep_until_file_has_changed myfile.py ; do ./myfile.py ; done Or any other solution as easy as that. BTW: I'm using Vim, and I know I can add an autocommand to run something on BufWrite, but this is not the kind of solution I want now. Update: I want something simple, discardable if possible. What's more, I want something to run in a terminal because I want to see the program output (I want to see error messages). About the answers: Thanks for all your answers! All of them are very good, and each one takes a very different approach from the others. Since I need to accept only one, I'm accepting the one that I've actually used (it was simple, quick and easy-to-remember), even though I know it is not the most elegant.

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• ip route add HOMEIP via SERVERIP disconnects me from ssh

  - by Arya

  I want to use a vpn connection on my Debian server but I get disconnected from ssh if I connect to the vpn. I thought by using the "ip route add" I can prevent getting disconnected from my server and it will continue to use the main connection for communication between my computer and the server, and the vpn for communication with other ips. This is the command I use ip route add PUBLICHOMEIP via PUBLICSERVERIP But I get disconnected after the "ip route add" command too. Am I making a mistake anywhere?

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• Title: Better logging for cronjob output

  - by Stefan Lasiewski

  I am looking for a better way to log cronjobs. Most cronjobs tend to spam email or the console, get ignored, or create yet another logfile. In this case, I have a Nagios NSCA script which sends data to a central Nagios sever. This send_nsca script also prints a single status line to STDOUT, indicating success or failure. 0 * * * * root /usr/local/nagios/sbin/nsca_check_disk This emails the following message to root@localhost, which is then forwarded to my team of sysadmins. Spam. forwarded nsca_check_disk: 1 data packet(s) sent to host successfully. I'm looking for a log method which: Doesn't spam the messages to email or the console Don't create yet another krufty logfile which requires cleanup months or years later. Capture the log information somewhere, so it can be viewed later if desired. Works on most unixes Fits into an existing log infrastructure. Uses common syslog conventions like 'facility' Some of these are third party scripts, and don't always do logging internally.

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• How to troubleshoot this memory usage?

  - by Camran

  I have a classifieds website. I use PHP, MySql, and SOLR. Solr uses a Servlet Container, in my case JETTY, which is java application. I just noticed that something was terribly wrong on my website. I opened the terminal and entered the "top" command and noticed that JAVA was EATING all the cpu and mem. Now I thought "Ok, maybe I need more mem and cpu" So I increased it. But along with the increase the java app started eating more. This has never happened before, and it is either a bug, or a hack of some kind. Anyways, I need to troubleshoot this now, and so I wonder how do I do this? Can I somehow pinpoint exactly when the memory usage started to go up from some error log? How does one troubleshoot this? How do I prevent it? Is it possible to prevent too many requests somehow, if they are within a timeline? Thanks

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• setting up a samba PDC -error with testparm

  - by Rungano

  Hi guys I have installed a samba PDC but when I test the samba configurations file I am getting errors like these, "Invalid combination of parameters for service homes. Map system can only work if create mask includes octal 010 (S_IXGRP)." My Configuration file is as follows [homes] comment = Home Directories path = /home_srv1/%u valid users = %S read only = No create mask = 0660 directory mask = 0770 browseable = No I tried to google but with no luck, Serverfault is always my best hope. Thanks for helping out.

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• Execute script before shutting down in Ubuntu

  - by juanefren

  When I shut down my computer I want to show some pending tasks that I have to do before leaving the office... I did a local application to manage those tasks, so basically I just want to run a command, and shut down after I kill the app executed. I have already tried with these options: * /etc/gdm/PostSession/Default -- this works only when I select LogOut option instead Shutdown. * /etc/rc0.d/K01mycustomscript -- execute script after X is killed * $HOME/.bash_logout -- This looks like does nothing. * ./app-to-run && sudo shutdown -h now -- Don't like it for 2 reasons, prompts for sudo password, and can't use my laptop shutdown button. I am using Ubuntu 10.04

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• Raid 5 GPT Partitioning

  - by user39325

  I have a Dell Poweredge r710 server with five 1 TB disks. All of them are in RAID 5. I was trying to install Centos but it says "Your boot partition is on disk using GPT Partition..." I read somewhere that centos can't install on a disk larger than 2TB, so I made some partitions smaller, but it's not working. PS, I am going to install Proxmox on that, but Proxmox also won't accept disks larger than 2TB.

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• Postifix SMTP Load Balance

  - by user103373

  I want to load balance outbound emails between 3 post-fix gateways for sending mails only reason is to use multiple different source IPs to increase throughput & inbox delivery. Each gateway should receive an approximately equal amount of outbound messages. How is it possible please suggest. +---------- smtp A --------- Internet | clients -------- smtp lb ----- smtp B --------- Internet | +---------- smtp C --------- Internet

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