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• Choosing a monitoring system for a dynamically scaling environment: Nagios v. Zabbix

  - by wickett

  When operating in the cloud and scaling boxes automatically, there are certain monitoring issues that one experiences. Sometimes we might be monitoring 10 boxes and sometimes 100. The machines will scale up and down based on a demand. Right now, I think the best solution to this is to choose a monitoring solution that will instantiation of targets via calls to an API. But, is this really the best? I like the idea of dynamic discovery, but that is also a problem in the cloud seeing that the targets are not all in the same subnet. What monitoring solutions allow for a scaling environment like this? Zabbix currently has a draft API but I have been unable to fund a similar API for Nagios. Is there a similar API for Nagios? Anyone have any alternate suggestions besides Nagios and Zabbix?

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• Super simple high performance http server

  - by masylum

  I´m building a url shortener web application and I would like to know the best architecture to do it in order to provide a fast and reliable service. I would like to have two separate servicies in different machines. The first machine will have the application itself with a apache, nginx, whatever.. The second one will contain the database. The third one will be the one that will be responsible to handle the short url petitions. For the third machine I just need to accept one kind of http petition (GET www.domain.com/shorturl), but it have to do it really fast and it should be stable enough. Which server do you recommend me? Thank's in advance and sorry for my english

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• What is the best time to schedule regular updates on inhouse production server?

  - by akira

  Given an inhouse server running in production mode I would like to keep the impact on the users as low as possible when deploying regular updates (to the server itself, not the user machines .. but that would be a pretty similar problem). The obvious answer to my question is "at night, when the users are at home". But "night" is a long period of time. Should one start early in the evening to perhaps catch problems with the update early on and be ready to rollback? Or is it better to start early in the morning and use the first users as "guinea pigs" to faster trigger the problems? Or in the middle of the night when the concentration of the one overseeing the update is pretty low but it is guaranteed to have no open file handles of some late working users? Are there any research papers on the topic?

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• Distributed website server redundancy

  - by Keith Lion

  Assume a website infrastructure is very complicated and is fully distributed (probably like most large web companies). Am I right in thinking that although there are all these extra web servers to handle multiple client requests, there is still a single "machine" whereby users must enter? I am guessing this machine will be the one physically associated to the IP address? I ask because I need to know whether, in places where distributed systems exist, there is still a single point of failure- usually the control node or, in this example, the machine connected to the public internet? Surely there cannot be two machines connected to the internet, as they would have to have different IP addresses? This "machine" may not be a server per se, but maybe it is a piece of cisco equipment. I just need to know whether, in the real world, these distributed systems still have a particular section where they depend on the integrity of one electronic device?

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• Using rsyslog to create different log files for different processes

  - by user80203

  Scenario: I am running a cluster of machines. Each machine runs various python programs with a unique (across the cluster), but dynamically set, ID. Right now, they are all logging locally. So, I might have logs that look like: process_5.log process_6.log for processes that had ID's 5 and 6. Another machine may have: process_20.log process_25.log I wish to forward these logs to a logserver running rsyslogd. Python's logging facility has a nice syslog handler, so I understand how I could connect to the remote server. What I haven't figured out is how to use templating/DynFile to maintain log separation. e.g. on the logserver, I will want to see: process_5.log process_6.log process_20.log process_25.log which correspond to the logs of the same name on the sending machine. Is there a way to pull this off with rsyslogd templating?

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• Exploring other windows 8 machine's root

  - by moswald

  (Note, this is without a domain.) I used to be able to type start \\other_machine\c$ in PowerShell and explorer would pop up with a login dialog. Then I'd type other_machine\moswald and my password (the account is a local admin, of course) and I'm in. Now both machines have Windows 8 installed, and this no longer works (the dialog re-prompts with an "Access is denied" displayed). I've verified (through whoami) that the user is named other_machine\moswald, and I'm positive I'm typing the correct password. So what gives? (edited to include specific result)

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• Windows 7 + Bind on Ubuntu - DNS keeps stopping

  - by fistameeny

  I have a Bind DNS server running from Ubuntu 12.04 LTS Server 64 bit. In there, I've setup some local A records for internal websites, e.g. wiki.domain.local. Everything works fine, except that every so often (a few times a day), the DNS stops responding on client machines (running Windows 7). The only way I've found to fix it is to stop/start the dnscache service on the Windows machine. Sometimes if I just wait for a few minutes, the DNS will start to work again. I've checked the Windows event log and can't see anything relevant. I've also had a look in the Bind logs and can't see anything there. Has anyone experienced this before?

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• Operating Systems supported by the Intel SR1435VP2 Server Platform?

  - by Xspence

  I recently had two Intel SR1435VP2 Servers (with SE7320VP2 server boards) donated to me from a colleague. Google hasn't yielded much more than user manuals when searching for OS-compatibility answers. I have worked with flavors of Linux such as Ubuntu and Debian, but Intel only documents that they have tested proprietary operating systems such as SuSE, Solaris and Red Hat as documented on their driver downloads page. Has anyone worked with these machines before, and if so, do you know if the SR1435VP2/E7320 chipset supports OS's such as CentOS, Debian or Ubuntu? If you need more information or clarification, let me know. This is all new for me. Thanks in advance.

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• Is Tomcat Shared Session / Cluster between two machine possible?

  - by Snorri

  I have a setup of several Tomcat servers distributed between a few servers, all running the same thing. Apache is on top of Apache and a loadbalancer in front of the Apache servers. I want to cluster the Tomcats using Shared Session to minimize downtime and user interruption while deploying apps. I know clustering works within the same server but is it possible to setup Tomcat in a way that it shares sessions between servers on different machines? = Server 1 == Apache 1 === Tomcat 1 = Server 2 == Apache 2 === Tomcat 2 When Server/Tomcat 1 would be taken down, users and their sessions would transfer over to Server/Tomcat 2 and vice versa.

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• How secure is cloud computing?

  - by Rhubarb

  By secure, I don't mean the machines itself and access to it from the network. I mean, and I suppose this could be applied to any kind of hosting service, when you put all your intellectual property onto a hosted provider, what happens to the hard disks as they cycle through them? Say I've invested million into my software, and the information and data that I have is valuable, how can I be sure it isn't read off old disks as they're recycled? Is there some kind of standard to look for that ensures a provider is going to use the strictest form of intellectual property protection? Is SAS70 applicable here?

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• Server 2003 slow share.

  - by G V

  I am running an 03 box with shares active. When uploading to the share, the speed is average. About 15-20 mbps.. But when you think about it, it is bad because it is a direct connection to a couple machines. When uploading to another server the connection speed is twice that of the direct storage. When uploading s massive folder, 250 GB, the upload will start as normal, but as it progresses it drops in speed. Now it is sitting at around 2-7 Mbps. Any ideas on how i can boost the transfer rate? On a side note, the download speed is great. It is a speed that you would expect from this setup, the main problem is uploading and what is causing the extreme slowness in speeds. Any help would be great.

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• Getting Started with windows server 2008/2012

  - by hbrock

  First let me say, I am a programmer(not a super star) but I want to get more into the system/network administration side of things. This because there are more jobs for system/network administrators in the area I live. Right now I am using virtual machines to learn how windows 2008/2012 works and to build labs with. But how would I prove to an employer what my skill set is with windows 2008/2012? As a programmer I would point to my past projects, code samples, and so on. Thanks for any help.

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• Several devices in Device Manager have Code 3 error

  - by John Straka

  One of our users' machines (Dell Optiplex 380 running Windows 7 32-bit) is having a weird driver issue. A bunch of devices have Error Code 3: The driver for this device might be corrupted, or your system may be running low on memory or other resources. (Code 3) The system isn't low on memory (only 1GB in use out of whatever the max for 32-bit is.) Here's a screenshot of the affected devices: I tried reinstalling the chipset and audio drivers to no avail. I have no idea what prompted it, and I'm not sure how the basic Windows Generic PnP Monitor driver could even be corrupted. What might be causing this error?

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• what's the difference between /etc/init.d/sshd start and /usr/sbin/sshd?

  - by jasono

  I'm having issues with passwordless ssh. I've checked, double checked and checked again that I have everything set up correctly. Both machines are RHEL6 and when the destination machine first boots up passwordless ssh does not work. If I stop ssh (service sshd stop or /ect/init.d/sshd stop) and then start it directly (/usr/sbin/sshd) passwordless ssh works fine. If I start ssh via the service (service sshd start or /etc/init.d/sshd start) passwordless ssh does not work. Just for testing I've tried commenting out the entire start() function in /etc/init.d/sshd and replace it with /usr/sbin/sshd - that still fails to allow passwordless ssh. I believe that this means that something in the /etc/init.d/sshd file is causing the screw up but I don't know enough about linux to narrow the issue down.

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• Cygwin creates files with special (shared) icons on windows

  - by barjonah

  I use cygwin to transfer files between linux and windows machines. Everytime I transfer a file to a windows machine it adds an extra shared user icon on the file's or folder's icon itself. This also happens if I create a file from cygwin on windows using pretty much any command: echo, vim, nano, cat. This is what the cygwin-created folders (and files) look like. This is what a normal folder (or file) looks like. I'm thinking it has to do with permission, because I'd have to chmod it everytime if I want other applications to access the files or folders on windows. How can I tell cygwin to create regular ol' files just like a user or any program would?

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• better options for screen?

  - by lonestar21

  OK. So I love screen. It has saved my bacon a few times when machines crash or get disconnected from the network. However, there are enough reasons keep keep me from using screen for everything, which include: Pain in the butt scrolling. Why can't I just interact as though this is a normal bash shell? My keyboard shortcuts are gone. I have a number of things customized in my bash environment, is there a way to get them to work in screen as well? Are there any tools our tips that I can use to make my screen-using experience as high quality as my bash using experience?

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• Saving small text files is slow over Win Server 2008 R2 VPN

  - by Buckers

  We have a VPN connection to our Windows Server 2008 R2 machine, and the connection works fine. Large files go back and forth fairly quickly, but we use the connection mainly for working on small text files (.aspx, .asp, .php etc). What we find very annoying is that even the smallest of files, there is a noticeable delay of between 2-5 seconds when saving any changes. As we often make changes to code and are constantly saving, this is becoming a problem. Is there anything that might be causing this delay? Or is there anything we can do to speed it up? The connection is definitely not the issue as we have a constant 5Mb upload from our server, and 20Mb+ down on the remote machines. Thanks, Chris.

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• Using DNS entries to determine location

  - by Raphink

  I'm trying to think of a clean way to determine the location of machines (mainly, which datacenter they belong to) based on their network settings. I would like it to be dynamic, and I'm thinking of using special DNS records that would be specific to the DNS server in each datacenter. For example, you could have: root@machine1# dig TXT mysite ... mysite 3600 IN TXT "DC1" ... root@machine2# dig TXT mysite ... mysite 3600 IN TXT "DC2" ... etc. I know that DNS has a special LOC record for location, but it takes coordinates, so it doesn't help in my case. Is there a standard way of addressing this issue, another special type of record for it, or some standard entries in TXT records?

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• Set up an Email server on intranet without domain

  - by Devdatta Tengshe

  I work in a small office with about 35 people and we are all on a intranet. This network is not connected to the internet. Is it possible to set up an email server, with which we could send emails to each other? (We don't need to send emails outside our network.) I cannot use a messenger service like Openfire, since the messages could be asynchronous, and we'd like to get those emails in a email client like Thunderbird. Another obstacle we have is that we do not have a domain name. Any ideas on which free (as in beer) software could be used? We have both Windows and Linux machines.

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• Windows Internet Connection sharing with Mobile Broadband

  - by PaoloFCantoni

  Due to circumstances, I have only got mobile broadband where I am living. I have a small network with a ADSL Router (but which isn't connected to the Internet. I want to use ICS to allow one machine (with the MBB modem) to act as the Internet interface and allow other machines connected to the ADSL router (including a new Android tablet by WiFi) to use the single mobile broadband connection. I've a feeling that my configuration is not valid - as it stands, but I'm not sure. Can some kind soul lead me "by the nose" to getting this working? FWIW The mahcines are all running Windows 7 TIA, Paolo

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• Cannot access Samba Share that is on Linux

  - by doug

  I have 3 virtual machines; Windows Server 2012, Windows 8, and CentOS Linux. The Server is configured with active domain. The CentOS VM has a Samba Share which has rights for the domain Administrator. Now, the Windows Server 2012 DC can successfully locate the share, but cannot access it (with Admin) ? Is it not possible for the Server to have access to it has Domain Client Admin, not Server Admin ? Hope this is clear? Thanks

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• What would cause a single working website to not work on 1 out of 5 devices on a network?

  - by th3dude

  There is a specific website that loads up without problem on all machines on my network (both wired and wireless) except one laptop. This laptop is a Windows 7 machine that was just recovered using the recovery partition, so it is fresh. The site will not load in Firefox 3.6 or IE 8. The website is http://www.weightwacthers.com The site loads fine on my desktop, iPhone, and Droid, but not the laptop. In all my years in this business I've honestly never seen this happen. Also, 'Is it down for me or everyone' reports that it is indeed only me. What would cause this to happen?

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• Is anyone working on an encfs client for windows?

  - by snth

  I've been looking into encfs as a solution to encrypt my personal data. However I want to access this data both on Linux and Windows on different machines (synced through Dropbox). So far all Google searches have brought up pages which specify that there is no Windows client that reads encfs. Therefore my question is: is anyone working on a Windows client for encfs? It would be really useful if someone was and it seems to be a common enough issue raised that I have a glimmer of hope that someone might be working on it.

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• Setting up a transparent proxy with only one box.

  - by Scott Chamberlain

  I am playing around with transparent proxies, unfortunately I do not have two machines to test it out with. The current way I am doing things is the program makes a request to a computer on port 80, I use iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234 to redirect to my proxy that I am playing with. the proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy so I want to do something like iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80 The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip? Or am I doing this setup completely wrong, I am learning after all and constructive criticism is definitely appreciated. The machine I am using is pretty low end so I would like not not have to create a VM with a second box unless absolutely necessary.

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• git-receive-pack : command not found.

  - by Philippe Mongeau

  I made a git repo on a local machine with "git init --bare" and added it as the remote origin on the project on my main computer with ssh: git add remote origin [email protected]:repoName.git I was able to make a commit and push from my main computer to the other computer the day I created the repo, but today i tried and it didn't work. When I did "git push origin" it returned this error: bash: line 1: git-receive-pack: command not found fatal: The remote end hung up unexpectedly The two machines are mac the main one running Leopard and the server one running Tiger. I think it may be realted to the $PATH of git on the server but I'm not sure. i used theses instrution to create my git server: http://blog.commonthread.com/2008/4/14/setting-up-a-git-server

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