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• when to upgrade server to include more cores, versus more processors, versus additional server?

  - by gkdsp

  The server hosting market is separated into single, double, qual, etc., processors, where each processor has several cores, or CPUs. My company will offer a Linux-based web application that relies on an Apache web server and a middle tier for business logic. The middle tier is used to crunch math, and return result to a client. Many clients may access the application simultaneously. The company will start with one processor having 4 cores. I'm trying to understand how the app uses the cores and then how to scale the application as business grows, in terms of servers/processors/cores. For example, I'd assume initially one core would be used for Apache, and the other 3 used to process client's requests for math crunching... Question 1: does that mean, with the 3 cores available, I can handle 3 separate client requests simultaneously (e.g. 1 for each of 3 cores)? I mean, except for the shared RAM, is this effectively like having 3 individual machines (from pt of view or processing client requests simulaneously)? Or, only one client's request may be processed at any one time, but that client's request is divided up into up to 3 cores depending on the type of process running that does the math crunching and whether or not it can take advantage of multi threading (so the # of cores impacts how fast any one client request completes)? I'm confused about what the cores mean to the application here. Question 2: As the business grows and more client requests need to be processed, should the server be upgraded to (A) a new machine with more cores, (B) a new machine with two processors, 4 cores each, or (C) keep the original server and add another server with a single processor? Which route provides the most efficient way to scale the application, in terms of processing more client requests per time interval? Is the choice, for example, limited by RAM (when you need more RAM than box can handle it's time to add another server), or something else? Question 3: Is the total number of client requests processed simultaneously equal to the number of cores times the number of servers (minus the one core for Apache)?

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• How can I convert and repair MPEG-TS (DVB-S captures) for better playback?

  - by SofaKng

  I have a lot of MPEG-TS video files (H.264 video with AC3 or MP3 in a .TS container) captured from a DVB-S capture card. When I play these videos it's much slower to seek in the video (ie. skip 30 seconds, etc) than with other files. I'm not sure if the problem is the H.264 encoding (reference frame count?) or the MPEG-TS container, or if the MPEG-TS file contains sync errors, etc. Does anybody have a good workflow for converting and repairing these files?

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• Sharepoint 2010 moving site collection to different database error

  - by Brandon Ulasiewicz

  I am trying to move a site collection from one content database to another content database. First I used the following PowerShell command: New-SPContentDatabase -Name New_DB -WebApplication http://portal/ I confirmed that this did in fact create the DB in the SQL Server. I then used the following command: Move-SPSite http://portal/sites/hr -DestinationDatabase New_DB This generates an error stating that the "Operation is not valid due to the current state of the object" Can anyone help point me in the right direction with this? Thanks

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• USB Wireless adapter that works with Windows 7 (32 and 64bit)

  - by Kjensen

  Can anybody recommend a USB wireless network adapter, that has Windows 7 drivers for both 32 and 64 bit? It also needs to reconnect to the network when the computer is brought out of sleep. I have three of these from earlier (from Allnet, trendnet and linksys), and just one of them has working drivers for Win7 64bit - but fail to return from sleep in a working state.

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• Xen domU mem-set issue

  - by Casper Langemeijer

  I'm running into a problem on my xen 4.0.1 server (debian squeeze) My host has 32G of memory, Domain-0 has 2048 M assigned to it. (scaled down with xm mem-set Domain-0 2048) top in Domain-0 confirms this. I created a virtual machine config file (using xen-tools) with the following options: memory = '512' maxmem = '2048' Both host and guest machines are running the standard 2.6.32-5-xen-amd64 debian kernel. 'xm create' creates a virtual machine with 512MB of memory as expected. Then 'xm mem-set domU 1024' will not expand the memory to 1024MB running 'xm mem-set domU 400' does set the memory to about 400MB Then 'xm mem-set domU 1024' will expands the memory back to 512MB Based on this, you would say that xm ignores the maxmem and silently sets maxmem to 512, but in the output of xm top the MAXMEM column reads 2G. the MEM column will not go over 512M. The output of xm list tells another story, it shows 1024 when I 'xm mem-set domU 1024'. I've googled myself all away around the internet for this issue and found that most people don't scale back Domain-0. I know I've seen a bugreport about the issue I'm experiencing, but can't find it anymore. Does anyone see what I'm doing wrong here? Hmm.. I just upgraded my kernel to the one provided by debian backports. The issue has gone.

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• Can Dovecot IMAP automatically create Maildir folders for new (virtual) users?

  - by user233441

  everyone. I am learning to set up a dovecot home IMAP server using a virtual Ubuntu 12.04 machine. My intention is eventually to have a home server that uses POP3 to take email from several addresses and remove them from my ISP's servers, while making them accessible through a home IMAP server (this is similar to the setup described at https://help.ubuntu.com/community/POP3Aggregator, which explains how to set up the system with dovecot version 1, and is thus outdated). I intend to use the ISP's server directly when sending messages, and to BCC all sent messages to myself. I've completed the basic set up of the test server: getmail uses POP3 to fetch messages from two test email accounts, and successfully delivers them to the respective Maildir-style new folders on the virtual machine. Dovecot then successfully sees these messages. I have two questions: 1) I had to set up new, cur, and tmp folders for both of the test accounts manually to get this setup to work. Is there a way to get dovecot to create these Maildir folders automatically when I create a new virtual user account (e.g., when I add a user and password combination to my dovecot password file), or is it expected that I write a bash script to automate that task? 2) I would welcome any comments you have on how this approach could be improved as I learn to set it up. My motivations with this approach are 1) to enable archiving/storing emails from several hosting providers that impose a cap on server storage, and 2) to give me somewhat greater control over email storage without requiring that I set up and administrate a mail server from scratch (which I'm not yet prepared to do) (this follows the recommendations at https://ssd.eff.org/tech/email). Thank you!

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• Rescue system running TFS that BSODs, into vmware esxi

  - by 3molo

  Hi, After moving to new facilities, one of our old Dell servers running Windows Server 2003 R2 on PowerEdge 2650 HW BSODs with 0x8e. The server runs Team Foundation Server, so we have a few guys dependent on it. No one here knows TFS, so we have no idea how difficult it would be to setup from scratch. We have the MSSQL database(s) backed up, recent and fresh copy. Tried removing/refitting memory modules, but with no success. The system boots into safe mode but hangs occasionally. I booted a linux livecd and did a dd of both c: and d:, so I have all the data in compressed images on a vmware machine. For the guest, I created a 38G (actually it became 40GB) partition to act as C:, and booted a live cd. I then uncompressed the compressed disk image of c: and dd'd it to the new c: using 'gunzip -dc c.img.gz | dd of=/dev/sda1 bs=1M'. The operation ran for about 1000 seconds, and completed successfully. I assumed it would at least try to boot windows (but most likely BSOD due to not having correct drivers), but the Vmware ESXi guest does not seem to recognize it as a bootable disk. We don't have the vmware enterprise license, so the vmware converter cold cloning is not an option. Did I do something wrong in my dd's etc with the ISOs, or why would it not (try to) boot? Am I wasting my time? What other approach is there? Will continue to try to remove services and drivers to make the physical machine at least work reasonably well in safe mode. What do you suggest? 1. Continue to get the dd'd images to the virtual disk and get it to boot. 2. Install a new windows server, get team foundation server and restore from backup. 3. Focus on the old problematic hardware Any help appreciated

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• VPC SSH port forward into private subnet

  - by CP510

  Ok, so I've been racking my brain for DAYS on this dilema. I have a VPC setup with a public subnet, and a private subnet. The NAT is in place of course. I can connect from SSH into a instance in the public subnet, as well as the NAT. I can even ssh connect to the private instance from the public instance. I changed the SSHD configuration on the private instance to accept both port 22 and an arbitrary port number 1300. That works fine. But I need to set it up so that I can connect to the private instance directly using the 1300 port number, ie. ssh -i keyfile.pem [email protected] -p 1300 and 1.2.3.4 should route it to the internal server 10.10.10.10. Now I heard iptables is the job for this, so I went ahead and researched and played around with some routing with that. These are the rules I have setup on the public instance (not the NAT). I didn't want to use the NAT for this since AWS apperantly pre-configures the NAT instances when you set them up and I heard using iptables can mess that up. *filter :INPUT ACCEPT [129:12186] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [84:10472] -A INPUT -i lo -j ACCEPT -A INPUT -i eth0 -p tcp -m state --state NEW -m tcp --dport 1300 -j ACCEPT -A INPUT -d 10.10.10.10/32 -p tcp -m limit --limit 5/min -j LOG --log-prefix "SSH Dropped: " -A FORWARD -d 10.10.10.10/32 -p tcp -m tcp --dport 1300 -j ACCEPT -A OUTPUT -o lo -j ACCEPT COMMIT # Completed on Wed Apr 17 04:19:29 2013 # Generated by iptables-save v1.4.12 on Wed Apr 17 04:19:29 2013 *nat :PREROUTING ACCEPT [2:104] :INPUT ACCEPT [2:104] :OUTPUT ACCEPT [6:681] :POSTROUTING ACCEPT [7:745] -A PREROUTING -i eth0 -p tcp -m tcp --dport 1300 -j DNAT --to-destination 10.10.10.10:1300 -A POSTROUTING -p tcp -m tcp --dport 1300 -j MASQUERADE COMMIT So when I try this from home. It just times out. No connection refused messages or anything. And I can't seem to find any log messages about dropped packets. My security groups and ACL settings allow communications on these ports in both directions in both subnets and on the NAT. I'm at a loss. What am I doing wrong?

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• Copy an existing OS X install from another drive

  - by Kevin Burke

  I just bought a new solid state drive, and I'd like to copy all of the files and setup from my current Mac OS X hard drive onto it. What is the best way to do this? I have a 1TB external hard drive, my drive backed up on Time Machine, and Snow Leopard on a DMG, but no external mount for the SSD, and no install DVD (it's at my parents house, promise). I'm familiar with the command line and booting up Mac OS X from a hard drive.

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• Servers - Buying New vs Buying Second-hand

  - by Django Reinhardt

  We're currently in the process of adding additional servers to our website. We have a pretty simple topology planned: A Firewall/Router Server infront of a Web Application Server and Database Server. Here's a simple (and technically incorrect) diagram that I used in a previous question to illustrate what I mean: We're now wondering about the specs of our two new machines (the Web App and Firewall servers) and whether we can get away with buying a couple of old servers. (Note: Both machines will be running Windows Server 2008 R2.) We're not too concerned about our Firewall/Router server as we're pretty sure it won't be taxed too heavily, but we are interested in our Web App server. I realise that answering this type of question is really difficult without a ton of specifics on users, bandwidth, concurrent sessions, etc, etc., so I just want to focus on the general wisdom on buying old versus new. I had originally specced a new Dell PowerEdge R300 (1U Rack) for our company. In short, because we're going to be caching as much data as possible, I focussed on Processor Speed and Memory: Quad-Core Intel Xeon X3323 2.5Ghz (2x3M Cache) 1333Mhz FSB 16GB DDR2 667Mhz But when I was looking for a cheap second-hand machine for our Firewall/Router, I came across several machines that made our engineer ask a very reasonable question: If we stuck a boat load of RAM in this thing, wouldn't it do for the Web App Server and save us a ton of money in the process? For example, what about a second-hand machine with the following specs: 2x Dual-Core AMD Opteron 2218 2.6Ghz (2MB Cache) 1000Mhz HT 16GB DDR2 667Mhz Would it really be comparable with the more expensive (new) server above? Our engineer postulated that the reason companies upgrade their servers to newer processors is often because they want to reduce their power costs, and that a 2.6Ghz processor was still a 2.6Ghz processor, no matter when it was made. Benchmarks on various sites don't really support this theory, but I was wondering what server admin thought. Thanks for any advice.

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• Can I disable OS X Lion Autosave and Versions?

  - by Philip

  OK I'm going there: I want to turn off a new feature in OS X that's so infuriating I could swear it was designed by Microsoft, namely, Autosave / Versions. I just don't want it. I have a workflow that involves my trigger finger on cmd-S, I use my own VCS when necessary, I save as compulsively and I open applications like TextEdit and Preview as temporary notepads without wanting any changes saved automatically and without a stupid unlock dialog that then records my changes when I only want to see the changes and not record them. So: please tell me how I can turn off Versions without rolling back to 10.6, and you will be my new personal hero. Thanks! PS: Just asking how to disable, not for a discussion of the pros and cons of the features.

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• Uninstall Glassfish and metro completely

  - by user775829

  I thought of updating my Glassfish server from 2.1 to 3.1.1 in a Linux machine. I downloaded the .ZIP package. However during uninstalling of Glassfish v2.1 I did not find the uninstall.sh file in "bin" directory. Following are a few steps which I did... I removed the glassfish folder (rm -rf ...) After removing files in the end it gave me a notification that it could not remove 2 files used by Metro. I cant recollect those file names, but I manually deleted that folder. I made a mistake by first not uninstalling Metro. I uninstalled metro completely after that. but it seemed pointless (it uninstalled successfully :P ) I transfered the Glassfish 3.1.1 ZIP file and unzipped and configured it. FOllow are a few Problems I am facing I cannot deploy any of my WAR file. Its giving errors saying " Error creating bean,Instantiation of bean failed etc etc." (However the WAR file is getting deployed successfully in other Linux Machine) When I try installing Metro v2.1 separately, it does not show the admin console or it timesout while starting the domain. The Log File of the Domain says it has started the domain successfully and the process is also created. But after running the command (asadmin) it takes like forever and times out without showing Domain Started Successfully, There is no uninstall.sh in Glassfishv3.1.1 bin directory. How do I completely uninstall Glassfish v 3.1.1 and Metro 2.1 ??? What are the files which I will have to manually remove?

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• Full Apache config migration

  - by Victor Rashkov

  I searched alot and didn't find an applicable answer. I have a working LAMP setup on Ubuntu machine and I have to migrate to a new server in a different country. The old server is 11.10, the new server is 12.04LTS. My problem is that I simply can not remember the steps I followed when I configured the current server which is not the basic LAMP install. It is Apache with FastCGI, SuEXEC, a GD library, worker MPM and all sitting on top of a mhddfs system. There are also other configs I've changed and I can not recall what they are. Because of the complexity of the setup, my attempts to migrate to the new server fail. I get permissions errors, cgi problems etc. Therefore my question is : Is there a sane way to simply tar a full backup of the current web server installation, including MySQL, Php amd the apache server with all configs, and then move it to the new machine? I shall be forever thankful on any advise. So far non of thise I found here gave me an answer. Thanks!

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• Physical Debian to VMWare: vmware-converter, dd-image or otherwise?

  - by Dabu

  we have two debian Lenny production machines, both running larger commercial websites. Now these machines need to be moved, and in the process, they need to be virtualized to VMWare ESX. If you believe the internet information, there are several ways to accomplish this. The easiest for us would be to use our weekly dd backup where the whole disk, however, I have no experience with this kind of technology and if it is really possible. The second best way would be via an application on the source machine virtualizing it and generating an ESX compatible VM. However, the software is beta and unsupported, and after installation, nothing really works (the /etc/init.d/vmware-converter script doesn't actually do anything, start and stop reply with success messages, yet ps shows that there are no new processes). The worst way with the most work would be to install a new machine and set it up manually, copying files and databases as needed. This part is clear in it's execution, and my question(s) do not touch this. Is my 1st way possible? Has anyone done this yet, or better, has a page with instructions? Or is there a help page that explains how to correctly install, run and use the vmware-converter tool using a Debian installation (it's possible that I dod something wrong during installation already)? Thank you.

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• Audio server with best API?

  - by Wintermute

  I'm a web dev, working in a small studio with a couple of other devs and some crayon-munchers (or, "designers"). Like all the best and trendiest creative studios, we have tunes. Our tunes consists of a set of speakers that whoever wants to can plug into their machine, and DJ their little socks off via iTunes, Spotify, VLC or whatever their music player of choice happens to be. Obviously, this lacks finesse. What we WANT is this: a single, dedicated machine running some sort of audio player (ideally Win-based, but a Linux flavour isn't impossible), that exposes an API. We (ie: me and the other devs) want to write a web-based client onto it, that'll let us remotely do all sorts of funky stuff like generating on-the-fly genre-based playlists, and voting for tracks, and making tea. My question - and please forgive me if this isn't the place for such a question, I was going to ask on Stackoverflow but that didn't seem right either - is this: what's the best player to start with? What can do all of this? I know VLC can function as a streaming server, but know nothing of any API it may have. I'd rather chop my pinky off than use iTunes, but if it does what we want, then... Anyhow, thanks for reading. All comments and suggestions gratefully received.

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• MySQL writing to net

  - by seengee

  I have a server that has been running at high CPU load due to MySQL activity, when i run the command mysqladmin pr i often see a few queries with the state "writing to net". I had a look around and couldn't find much out about this other than the fact i read somewhere that this shouldnt be expected in usual MySQL activity. Any ideas what this could mean? Running MySQL 5.0.91-community on CentOS 4.8

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• Ubuntu inside VirtualBox is slow

  - by Kapsh

  I am running an Ubuntu instance on VirtualBox inside XP. Here are the details: Host: Windows XP Pro Guest: Ubuntu 8.10 Total RAM: 3GB RAM For VM: 1GB Total Video Memory: 128MB Video Memory for VM: 40MB Hard Drive: 200GB Hard Drive for VM: 30GB Processor: 2.80GHz Core Duo The problem is that whenever I am inside the virtual machine, things seem so much slower in general. For example Firefox, Eclipse take longer to load, dragging windows show a lag etc. I have tried running Ubuntu before (not inside a VM) and it seemed fantastically fast. So I am disappointed to have to deal with this situation. But I need access to the XP partition without having to reboot and hence the attempt. I am surprised with the perceived slowness since the whole world seems to be doing virtualization and I cannot imagine everyone works on slow systems knowingly. My question is - is there something I should be doing to boost performance? Am I doing something wrong? This is my home machine and I am not sure if this is the right forum to ask. Thanks.

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• linux shutdown hang with wifi cifs mounts

  - by Sirex

  Since fedora 15 (and now with 16) it seems that wireless clients take a long while to shutdown when they have network filesystems mounted at shutdown time. I've pushed out a cifs mount via puppet, and all clients have it, including those on wireless. If say a laptop is on a wired connection it shuts down just fine, but if its on the wifi at the time (and no wired connection) it'll hang at the fedora f logo. I'm not sure if its indefinite or just a really long while, but ill give it a test when i shut this machine down in a second. Needless to say its pretty annoying, so is there a way of causing the machine to shutdown even if network connectivity has been lost at unmount time, -- or an official way to reorder events so the wireless card is kept up until after the unmount happens during the shut down process (short of writing a custom script for shutdowns which is a bit of a kludge) ? It does this on multiple machines, and all started doing it when we went from fedora 14 to 15. It was such an obvious issue i'd kind of assumed someone must have reported it or there was an easy fix, but i've not discovered anything yet. Additional info: I can confirm that manually unmounting the mounts then shutting down (sudo shutdown or the xfce shutdown button) will shutdown just fine, it only hangs if the mounts are still mounted The puppet config that sets the mount looks like this (now with the _netdev entry that is indeed pushed to clients successfully, but makes no difference): file { "/mnt/share": ensure = directory,} mount { "/mnt/share": atboot = true, ensure = mounted, remounts = false, fstype = cifs, device = "//srv/share", options = "user,gid=shareusers,uid=${user},file_mode=0700,dir_mode=0700,credentials=/root/.smbcreds,_netdev", require = [ File["/mnt/share"], Group["shareusers"] ], } }

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• As an admin, what tools do you use to log what you do to your boxes?

  - by Jerry

  I am more of a linux applications developer than an admin. Over time, I've built servers and maintained them, sometimes to offer services, mostly just to develop the applications I work on. Way back when I would create a file in my account to keep notes on what I did on each machine, so that I could replicate that when I migrated to other machines. Nowadays, I install something a private trac installation, install it's blog plugin, and then use that to make notes of everything I install, and most commands that I run, as well as the output. This provides me a combination wiki and blog that I find very useful as a "captain's log". I do this mostly so that when I migrate to a new clean machine, I have a much easier time in bringing it up. And yet, I am always amazed when I see others just install this, delete that, run this, setup this config, ... without seeming to use any way to actually note what they are doing. What do YOU do, and what tools are available? I am especially interested in the transition between maintaining a few machines for a few people and maintaining several to dozens of machines providing a real service. What are the best practices, and where can I find good resources? Thanks!

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• JBoss naming service port conflict

  - by Kramer

  I am having trouble getting JBoss started. I am running JBoss 5.1.0 on Mac OSX (yes, I know it is an old version, but that’s what the application is certified on for now). I am using Apple’s JVM 1.6.0_37. I get the following error when trying to use JBoss (there are some more exceptions, but these are the first few): Error installing to Start: name=jboss:service=Naming state=Create mode=Manual requiredState=Installed java.rmi.server.ExportException: Port already in use: 1098; nested exception is: java.net.BindException: Can't assign requested address at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:310) at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:218) Caused by: java.net.BindException: Can't assign requested address at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:383) 16:57:15,596 ERROR [AbstractKernelController] Error installing to Real: name=vfsfile:/Users/home/server/jboss-5.1.0.GA/server/myserver/conf/jboss-service.xml state=PreReal mode=Manual requiredState=Real org.jboss.deployers.spi.DeploymentException: Error deploying: jboss:service=Naming at org.jboss.deployers.spi.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:49) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:118) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46) Caused by: java.rmi.server.ExportException: Port already in use: 1098; nested exception is: java.net.BindException: Can't assign requested address at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:310) Caused by: java.net.BindException: Can't assign requested address at java.net.PlainSocketImpl.socketBind(Native Method) Now I know what you are thinking, that I am running something that conflicts with that port, but I have used lsof and there is nothing listed on that port. I have tried changing the port in conf/bindingservice.beans/META-INF/bindings-jboss-beans.xml: <bean class="org.jboss.services.binding.ServiceBindingMetadata"> <property name="serviceName">jboss:service=Naming</property> <property name="bindingName">RmiPort</property> <property name="port">5098</property> <property name="description">Socket Naming service uses to receive RMI requests from client proxies</property> </bean> Unfortunately, I then get the name errors with the new port number. I also installed a network monitoring tool on my box and it doesn't look like any ports are being opened when I start jboss, but it is possible, that the tool might be missing a port that is opened and then closed quickly. Any ideas what could be the problem or how to fix it?

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• How to diagnose issue between mobo, RAID, and SSD cache drive? [migrated]

  - by goober

  Background This issue is happening on my custom-built desktop. Relevant specs: Motherboard: ASUS P8Z68-V PRO Utilizing Intel RST technology (application that uses unused SSD as cache) Processor: Intel core i7-2600k (not overclocked) HDDs: RAID1 of 2x Seagate Barracuda 1TB (ST31000524AS) (RAID performed via z68 chipset) Machine has run fine for ~1 year with no issues, and has been well-maintained (dust, etc.) What Happened Random Freezing issues -- intermittent Looked at the RST application screen to see that the acceleration cache was listed as "unavailable" -- recommended that I power down and reconnect the drive. Reconnected the drive to no avail. Attempted to move the drive to another SATA port. Acceleration option disappeared from RST software. Now, the freeze happens whenever loading something particularly data-driven (a video, a game, etc.) Steps Attempted Reconnected the drive to no avail. Updated Intel RST software to v. 11.6.0.1030 to see if that made a difference. Attempted to move the drive to another SATA port. Acceleration option disappeared from RST software. Connected the drive as its own volume. Formatted it, ran disk check errors -- all seems fine. Reconnected the drive and selected it again as the cache drive. Now, what happens when there is a freeze: Machine freezes I am unable to perform any command Screen then goes black I hit the reset button During boot, all drives show as "Disabled" and I am told no volume can be found I then hit the reset button (or power off/on) again. Either the next time (or sometimes after repeating this once more), the metadata cache is reconstructed and the system boots fine, showing the SSD as a cache. Question I believe this is an issue with the SSD itself, but how can I be sure since connecting it separately appeared to show no problems? I want to make sure it's not an issue with the motherboard, SATA ports, etc.

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• How can I make Bash (or Zsh) run a particular command before each entered command?

  - by Peeja

  I'd like to configure Bash to run a particular command before running each command line I enter at the prompt. Specifically, I'd like to tell Vim (which is running in another terminal) to write all open buffers, because in my workflow if anything's unsaved when I leave Vim it's a mistake. Is there an option for this in Bash? If not, is there an option in Zsh? (There is a readline-based solution that somewhat fits this problem on another question, but it feels a bit hacky. It'll take it as a last resort.)

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• Mounting fuse sshfs fails when invoked by Cron on FreeBSD 9.0

  - by Tal

  I have a remote server filesystem that I'm attempting to mount locally on a FreeBSD 9 machine via FUSE sshfs, and Cron for a backup routine. I have ssh keys between the boxes setup to allow for passwordless login as the root user on the local machine. Cron is set to run the following script (in Root's crontab): #!/bin/sh echo "Mounting Share" /usr/local/bin/sshfs -C -o reconnect -o idmap=user -o workaround=all <remote user>@<remote domain>.com: /mnt/remote_server As root, I can run this script on the command line without issue, and without being asked for a password the share mounts successfully. Yet, when run by Cron the script fails. The path to sshfs is identical to the value of which sshfs Here is the email root receives from the Cron Daemon: X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <HOME=/root> X-Cron-Env: <PATH=/usr/bin:/bin> X-Cron-Env: <LOGNAME=root> X-Cron-Env: <USER=root> Mounting Share fuse: failed to exec mount program: No such file or directory fuse: failed to mount file system: No such file or directory I'm stumped as to why I'm receiving No such file or directory in this instance. It further seems odd given that the paths appear to be correct. I've also attempted to compare the output of env on the shell with env inserted into the script. I don't see any environment variables that should cause this trouble. At bootup, FUSE reports its version as: fuse4bsd: version 0.3.9-pre1, FUSE ABI 7.8 Help me ServerFault wizards, you're my only hope!

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• Any ideas why Ettercap filters aren't seeing packet data?

  - by Bryan

  I'm using an Ettercap filter to detect a query response coming back from a particular service on a remote machine. When I see a response from the service, I'm searching through the data in the packet to see if an offset is a specific value, and if so I'm changing the value at another offset. Trouble is, when I try this on a new virtual machine I built my Ettercap filter's no longer getting any data in the DATA.data variable available to it. if(ip.proto == TCP && tcp.src == 17867) { msg("Response seen!\n"); if(DATA.data + 2 == "\0x01") { msg("Flag detected!\n"); DATA.data + 5 = 0x09; } } The filter's getting applied to the traffic because "Response seen!" messages get printed out by Ettercap. However, "Flag detected!" messages do not. I think DATA.data is indeed empty because if I change my second "if" statement to check for DATA.data == "" then the "Flag detected!" message gets printed. Any ideas why this may be happening?! Also, if this is the wrong site to be asking questions like this, please let me know. I wasn't sure if it fit better here or somewhere like superuser or serverfault. By the way, this is a cross-post from StackOverflow... I should have posted on this forum instead I think. :)

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• Advanced Terminal / Console apps for Mac OS X?

  - by Jakob Egger

  I use a lot of command line programs, very often with similar arguments. Can anyone recommend an application or a workflow that allows me to store often used shell commands and search through my recent commands, using a GUI? I have commands that I use very often (eg. rsync a specific directory to a server) and other commands that I use less often. Creating shell scripts for every code snippet I might reuse seems a bit awkward. Especially for programs that I use seldomly, I end up reading the docs over and over again, because I forgot to write down the exact shell command. Ideally I would like an app that's just like Terminal.app, but provides some kind of history and snippet management. What do you use to keep track of shell commands?

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