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• Best practice for administering a (hadoop) cluster

  - by Alex

  Dear all, I've recently been playing with Hadoop. I have a six node cluster up and running - with HDFS, and having run a number of MapRed jobs. So far, so good. However I'm now looking to do this more systematically and with a larger number of nodes. Our base system is Ubuntu and the current setup has been administered using apt (to install the correct java runtime) and ssh/scp (to propagate out the various conf files). This is clearly not scalable over time. Does anyone have any experience of good systems for administering (possibly slightly heterogenous: different disk sizes, different numbers of cpus on each node) hadoop clusters automagically? I would consider diskless boot - but imagine that with a large cluster, getting the cluster up and running might be bottle-necked on the machine serving the OS. Or some form of distributed debian apt to keep the machines native environment synchronised? And how do people successfully manage the conf files over a number of (potentially heterogenous) machines? Thanks very much in advance, Alex

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• Running php and java in parallel on the same server

  - by manni

  I have got a java server from Rackspace. and I am already running a java application on the server. Now I want to run a php application on the same server. What should I do? When I asked Rackspace people, they said, apache is already installed on the server so I can run the php on it. I have also tried installing php on the server and then copied my php files in var/www/xxx but when I hit the url it is saying giving the page not found error. They have given me the ssh server root username and password. Thanks in advance.

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• Cisco: changing VTP mode server/client to transparent

  - by J. Smith

  I have around 40 L2 switches (2960, 3560, 3500, 3750) running in VTP client mode and one L3 switch (6500) running in VTP server mode, all connected together. I would like to switch everything in VTP transparent mode without any interruption of service. I've already test on a poc version with 3 switches (Catalyst 2950, 3560 and 3750). Using serial and SSH connection, it is seems working but i'm not sure it is enough representative compare to the real network. Knowing that the VTP Pruning is enabled, I am wondering what would be the best procedure to proceed the changement. I've read that we could lost connection by keeping it enabled. Should I change the server or clients first? Is it important to change the VTP domain and VTP Pruning parameters?

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• What is the best Linux distro for a php web server? [on hold]

  - by benjisail

  We are planning to upgrade our hardware and at the same time we plan to reinstall all our web server from a fresh OS. Currently our web server is running on CentOS 4.7 on a dedicated server. We are using Apache, Mysql, PHP, SVN, FTP and all the needed tools for a web server managed through SSH. We plan to use a cloud server for the new web server. I don't know which Linux distro to take for this new server. Should I stay with Centos and just take the latest release 5.4 or should I switch to something else like a Debian base distro (Ubuntu Server)? The thing that I didn't like with CentOS was the none availability of the latest version of PHP and Apache on Yum. This make it harder to keep our webserver updated with the latest technologies... Thanks for your help!

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• ubuntu server refusing connections via port forwarding

  - by Matt

  Getting some really weird behavior from our Ubuntu server... it's behind a Verizon router firewall with port forwarding (port 8080 to port 80 on the server), and we've been having issues accessing it via this external IP. From within the network, it appears to respond normally (I can access it via web browser and SSH), but refuses connections through port forwarding (using our static external IP). The strangest thing is that it actually responds to external port-forwarded connections right after being restarted, but quickly lapses back into this pattern of refusing external connections. I'm a bit of a server newbie (I'm actually a programmer in a small startup that just lost their server ops guy, urgh) so this is all trial by fire for me. Does anyone have any advice on what could be going wrong here? Any help would be appreciated, thanks.

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• Amazon EC2 Socket connection not being accepted

  - by Joseph

  I am trying to run a java application on my EC2 instance. The application accepts socket connections on port 54321. If I try and connect to it, it times out. My Security Group is set as: TCP Port (Service) Source Action 21 0.0.0.0/0 Delete 22 (SSH) 0.0.0.0/0 Delete 80 (HTTP) 0.0.0.0/0 Delete 20393 0.0.0.0/0 Delete 54321 0.0.0.0/0 Delete Is there anything else I need to do? # iptables -nvL Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination # iptables -nvL -t nat Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination #

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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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• Finding the length of files and file path of directory structure in a Linux file system.

  - by Robert Nickens

  I have a problem on a Linux OS running a version of SMB where if the absolute path to a directory within a Shared Folder is greater than 1024 bytes and the filename component is greater than 256 bytes the SMB service crashes and locks out all other services for network access like, SSH and FTP rendering the machine mute. To keep the system for crashing I’ve temporarily moved a group of folders where I think the problem path may be located outside of Shared Folder. I need to find the file and file path that exceeded this limitation and rename them or remove them allowing me to return a bulk of the files to the Shared Folder. I’ve tried the find and grep commands without success. Is there a chain of commands or script that I can use to hunt down the offending files and directory? Please advise.

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• Build Advise for Home Web/NAS Server with Ubuntu Server 12.04 [closed]

  - by razor7

  I need to have a personal Webserver with NAS capabilities. The Webserver to test some LAMP projects I develop for clients, and also NAS to be able to stream media to local network. I want to have full control of the box, so I'm planning to build it with some spare parts and Ubuntu Server. The services/software that will run are (remember, is for personal and testing use only): SAMBA/CIFS SSH Server Apache 2 MySQL 5 Mercurial Repo PHP 5.3 Ruby on Rails OwnCloud Dovecot Webmin Postfix PureFTPd ClamAV The Hardware: Intel Dual Core E2180 2.0 GHz MSI P35 Neo Kinkston 1GB DDR2, 667 MSI Nvidia 7300le PCIe x16 256mb RAM HDD SATA WD Green 2TB x2 (RAID-1 with MDADM RAID Controller) 16 GB USB Pendrive (For server system installation) My idea is to build this system, using the pendrive for the Ubuntu Server software, and packages, and the RAID-1 for gross data storage. What do you think? Thanks a lot!

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• Load on Ubuntu 8.04 LTS high

  - by Paddington

  My Ubuntu 8.04 LTS server periodically has a high load avg spike(once every 2 days) resulting in Apache timing out and virtualy everything even SSH to the server is not possible. When I am on the console and run TOP is see that The load avg increases from less than 1 to above 60 in 15 mins. How can I isolate the cause? top - 09:21:51 up 37 days, 20:18, 6 users, load average: 5.41, 5.53, 5.36 Tasks: 160 total, 2 running, 156 sleeping, 0 stopped, 2 zombie Cpu(s): 65.0%us, 8.8%sy, 0.0%ni, 1.0%id,24.6%wa, 0.3%hi, 0.3%si, 0.0%st Mem: 3989468k total, 3444984k used, 544484k free, 360460k buffers Swap: 11687248k total, 178168k used, 11509080k free, 881772k cached

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• Server stop responding, where to look to know what happened?

  - by Cid

  I have a server that has been running for well over 5 months and suddently it stop responding. I couldn't ssh into it or anything else so I decided to reboot it and the reboot fixed it. I'm trying to figure out what happened and I'm not sure exactly where to look. I started to look in /var/log but there are tons of files in there and I'm not sure which one I should pay attention to. I'm slowly going through each one of them but if anyone can point me in the right direction, it would be great. Thanks!

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• VPS stops responding every now and again

  - by Or W

  I have a Linode vps that I use to host some of my websites on. It's Ubuntu based and it's up to date in terms of all packages. I don't have any cron jobs scheduled or any automatic processes. I host a few (up to date) wordpress blogs there that have very little traffic altogether. Every day (at a different time) my server stops responding, I can't SSH to it, web access is getting timed out and it just dies until I reboot it through the Linode manager. On the linode dashboard I can see that the CPU is not very high (2-3%) Incoming/Outgoing traffic is on 0 and the IO count has a spike just before the server stops responding (SWAP IO is at 2k and IO Rate is at 5k). When I reboot the server everything is just fine. I'm trying to figure out a way to analyze what's going on at these random times where the server freezes up. How can I determine the problem?

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• How to avoid trailing spaces when you copy something from terminal?

  - by Michael Härtl

  I often copy a code snippet from a SSH terminal session where i'm logged in to some remote server and have a file opened in vim, for example to paste it here into an answer at SO. It frequently happens, that the code is padded with trailing spaces to match the terminal width. Whereas i've seen this on both, my Ubuntu and Windows machines (using putty) i think, it doesn't happen always. I was not able to figure out when it happens, though. So i wonder how i can avoid those trailing spaces which i have to remove manually all the time in the textarea, where i copy it to. Note, that the files do not have trailing spaces on the server! It only happens if i select and copy some text.

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• centos 5.6, virtual on Vsphere

  - by Glasnhost

  suddenly my virtual centos server (5.6 on VMWare-VSphere) is not working... It started with the url not responding, nor the ip. (NO HTTP response, no ping). When I entered on the server via ssh to start troubleshooting I noticed that most of commands don't work anymore: top- machine hangs (it's not slow anyway) ps - machine hangs (funny enough apache server and web app are running and sending me emails) on some directory ls -l - machine hangs after first file, if ls l.txt the file show only the first file "more" command, also hangs on some file. So there are very little things I can try. I recovered my virtual machine from yesterday and before yesterday, and they show the same behaviour, it hangs on commands (but yesterday they were working). There is no firewall on the machine, there is on the host though. I can connect with ftp but I can't download files nor list directory apart the user top directory... Working hard right now, any idea appreciated

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• Configuring MPI on 2 nodes

  - by Wysek

  I'm trying to create really simple "cluster" from 2 multicore computers using openmpi. My problem is that I can't find any tutorials on that matter. I don't want to use torque because it's not necessary in my case nevertheless all tutorials give configuration details either about torque or mpd (which doesn't exist in openmpi implementation). Could you give me some tips or links to appropriate manuals? Steps I've already completed: - openmpi installation - network configuration (computers see each other) - ssh password-less login to second computer I tried using machinefiles without further configuration and with just 2 IPs in it. But jobs don't seem to start at all after initialization part. (MPI seems to work because I'm able to scatter jobs on multiple cores of both computers without communication between them).

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• How do I ask screen to behave like a standard bash shell?

  - by thornomad

  Just learned about the screen command on linux - it is genius. I love it. However, the actual terminal/prompt in screen looks and behaves differently than my standard bash prompt. That is, the colors aren't the same, tab completion doesn't seem to work, etc. Is there a way I can tell screen to behave just like a normal (at least, normal as in what I am used to) bash prompt ? Additional Information I am connecting via ssh from a Mac (Terminal) to a headless linux box (Ubuntu). After logging in, I have TERM=xterm-color and when I run screen I have TERM=screen. Am going to try the suggestions below to see if I can change the $TERM value first.

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• forward all ports via htaccess to new address

  - by user875933

  I have a chat server running on my local machine that listens to different ports. I want to use the sub-domain of one of my accounts to access it. I intend to manually change the redirect whenever my local machine gets a different ip address. So: chat.example.com:123 would redirect to dynamic.ip.address:123 I am trying to accomplish this with .htaccess and RewriteRule I have tried: RewriteEngine on RewriteRule ^(.*) http://dynamic.ip.address/ [L, R=302] but this doesn't work. When I try chat.example.com:123 nothing happens. When I input chat.example.com into the web browser, I get dynamic.ip.address Is .htaccess the right tool for this? I am using a simple web host that gives me ssh access, but not much more.

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• Encrypting absolutely everything, even within the LAN

  - by chris_l

  Has anybody tried that approach already? I'm really considering it: Instead of relying on network based IDS etc., every packet must use encryption which was initiated by a certificate issued by my own CA. Every client gets a unique client certificate Every server gets a unique server certificate Every service additionally requires to login. Both SSL and SSH would be ok. Access to the internet would be done via an SSL tunnel to the gateway. Is it feasible? Does it create practical problems? How could it be done and enforced? What do you think?

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• DHCP server can't see other machines

  - by William

  Hi, I setup a private network from virtual machines and one of the machines is the DHCP server for the group. I want to specify a next-server for the DHCP server but I'm having trouble connecting to any of the machines that I lease IPs to. I'm just trying to do a simple ping/ssh to 10.0.0.252 (a machine with a lease) but it doesn't seem to respond. Any advice? I'm assuming I need to be able to connect to my next-server but maybe I'm wrong. Thanks.

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• How to combine with openvpn, dynamic-ip?

  - by asfasdv

  Dear everyone, I am currently using openvpn to surf online to bypass censorship. Let me show you the initial scenario: before openvpn is turned on: IP: 1.2.3.4 (hypothetical, checked by visiting whatismyip.com/) after openvpn is turned on IP: 10.2.3.4 (this is also checked with whatismyip.com/, I assume this is where the vpn's exit point's IP ) Situation: Once I enable openvpn, I can still ssh into this computer by sshing into 1.2.3.4, even though visiting whatismyip.com/ says it's 10.2.3.4. However, I am on dynamic IP, I run a website, and am using tools (inadyn in particular) which pings the freedns.afraid.org (my dns server) and updates my ip. The messed up part is when inadyn does so, my dns changes the ip to 10.2.3.4, which is presumably the exit point of my vpn. How do I get around this? (Note that sshing into 1.2.3.4 STILL works).

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• Can't get iptables firewall working correctly

  - by Jay

  I'm setting up a new Centos 5.6 system and can't get my iptables firewall to work correctly. it won't let me use SSH through it. I'm new to Centos but not to Linux or iptables. I've been removing things until I have isolated the problem. I set up the firewall with a default ACCEPT rule for the INPUT chain. I can connect through to the server fine. If I change the command to only allow traffic from the interface connecting to my trusted network it stops working. Working: iptables -A INPUT -s 0/0 -d 0/0 -j ACCEPT Failing: iptables -A INPUT -i eth0 -s 0/0 -d 0/0 -j ACCEPT I've double checked the ip address I'm using corresponds to eth0 using ifconfig. Any ideas where I went wrong?

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• freebsd dev server on virtualbox over windows

  - by g_kaya

  I need a unixy environment for development purposes. I hate doing things on windows but it is more stable for daily use and I don't have a mac, so I'm having to use windows (7). I want to run freebsd in a virtual machine, configure it to be the localhost server, be able to connect using ssh (within my home-network) and be able to install vbox guest addons. If guest additions aren't the best, I can use solaris or linux flavours. I need no gui. I don't know anything about network stuff, so I need a detailed explanation from vise people here, or a nice doc to read. Edit : To be more specific as requested, I use following on unices: *django 1.4 *apache *python (2.7) *emacs *mysql *probably node.js *bash scripting I use windows to be able to do daily things easily, like connecting to my tablet, browsing and learning java. And I don't want to use linux as my desktop os, beacuse it gets broken a lot, it's annoying to maintain wlan problems and some more.

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• How to set/keep directory permissions?

  - by Dylan

  I'm using CwRsync to connect from my Windows development machine to a linux webserver : rsync -avuz -e ./ssh --exclude=".svn" /cygdrive/c/xampp/htdocs/project123/ [email protected]:/home/user123/public_html This syncs my development project directory nicely and fast to the server. But after doing this, all directory properties are reset to the local user user123 only, so the website is not available anymore. I need to manually reset those properties. Why is this happening, and how to prevent it? PS. coming from a Windows environment I'm having a really hard time understanding rsync. I copied the above command from some examples... just need to get this one small thing working too...

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• Triggering GDM login on a remote machine

  - by creator

  I have to briefly describe the situation. We are planning to make a computer classroom with workstations running Ubuntu 10.04. Since making accounts for each student has not been considered reasonable, we decided to make accounts for each student group. We don't want students to share their passwords between groups so the solution would be not to give them passwords at all, but let the teacher log them in instead. Obviously he shouldn't go from one machine to another typing in credentials by hand, so we need some script that will connect to a remote machine by ssh and make GDM (or probably any other login manager if GDM cannot serve this purpose) log in specified user. I couldn't find any solutions, as well as I haven't noticed anybody in similar situation asking for help, so my question will be: can the scheme described be realized and if yes, then how? Thanks in advance.

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• Public key repository - does this exist?

  - by allegroconmolto

  This is one of those "Surely this already exists, and if not, I damn well better build it!" moments. Here's my problem: I run a devteam, of around 10 individuals. Each of us has our own private key(s). When I go set up a new server for us, I have to import all of their keys to it. And if we start working with a contractor, I have to get his or her key too, and then import it and place it in .ssh/authorized_keys on the server. Ideally I'd like to be able to do something along the lines of: import_key allegroconmolto And it would contact a public repository of public keys, see if there was a user named allegroconmolto, and if so, import their key and add it to my authorized_keys. Adding future users would then be as simple as running import_key for them. I could then scp the authorized_keys file to all my servers and be done! This seems so obvious that I feel like it surely must exist somewhere.

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