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• How to store 250TB of data and develop a backup/recovery plan?

  - by luccio

  I'm really new to this topic, so big apology for stupid questions. I have a school project and I want to know how to store 250TB of data with life-cycle for 18 months. It means every record is stored for 18 months and after this period of time can be deleted. There are 2 issues: store data backup data Due to amount of data I will probably need to combine data tapes and hard drives. I'd like to have "fast" access to 3 month old data, so ~42TB on disk. I really don't know what RAID should I use, or is here any better solution than combining disk and data tapes? Thanks for any advice, article, anything. I'm getting lost.

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• Share one monitor with another user and display their screen as well

  - by Xiong Chiamiov

  My housemate and I just started playing the original RollerCoaster Tycoon again - what a nostalgia trip! Anyways, we both have two monitors, and would like to view the other's game on the secondary monitor while playing, since we're in different rooms. VNC-like applications sorta work, but they require two separate instances running (one to share each direction), and as a whole are rather slow and clumsy. We don't need any remote control at all, just viewing. I'm using XP, he Win7. We could probably get it to run through some means in Linux, if necessary.

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• How can I upgrade bash to >= 4.1 on CentOS 5.5?

  - by Agvorth

  I have a CentOS 5.5 VPS server. I want to use RVM. According to the console output when I run the RVM installer, RVM requires bash = 4.1. I just ran yum update. My bash version is now 3.2.25. If I understand how yum works, that means that 3.2.25 is sort of the version of bash that "belongs with" my CentOS version, and it's the latest version I can get using yum. (Right? Or am I wrong about this?) How can I get that on my CentOS 5.5 system? To clarify, I understand that I can just download the source and install, but I'm hesitant to break out of yum's version management system. Is there a way to upgrade bash without disrupting yum?

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• How to change internal page numbers in the meta data of a PDF?

  - by YGA

  I have a pdf document I created through non-Acrobat means (printing to pdf, then merging a bunch of pdfs), but I'd like to manually change the page numbers (i.e. the first several pages are simply title pages, the page that is labeled "page 1" is really the 7th sheet of the pdf). What's the simplest (and ideally, free) way to do this? To be clear, I am not trying to change the numbers on the pages themselves, but the page numbers in the "metadata" that the pdf stores (the pages themselves are already numbered correctly; I just want "go to page 1" to go to the page labeled 1, which could be sheet 7). For what it's worth, I'm on Windows, though I have access to Macs as well.

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• PostgreSQL disaster recovery options

  - by Alex

  My customer has quite a large (the total "data" folder size is 200G) PostgreSQL database and we are working on a disaster recovery plan. We have identified three different types of disasters so far: hardware outage, too much load and unintentional data loss due to erroneously executed bad migration (like DELETE or ALTER TABLE DROP COLUMN). First two types seem to be easy to mitigate but we can't elaborate a good mitigation plan for the third type. I proposed to use ZFS and frequent (hourly) snapshots but "ZFS" means "OpenIndiana" these days and our Ops engineers do not have much expertise in it, so using OpenIndiana imposes another risk. Colleagues try to convince me that restoring from PostgreSQL PITR backup can be as fast as restoring from a ZFS snapshot but I highly doubt that replaying, say, 50G of archived WALs can be considered "fast". What other options are we missing? Is ZFS an only viable alternative? Can we get a fast Pg DB restore time in the Linux environment?

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• Minimizing windows to tray in xfce

  - by Gryllida

  For XFCE (v. 4.8), I'm searching for possible options to minimize windows to tray (iconify). This means that 1) they're not in the window listing and 2) they're not in the alt+TAB menu and 3) when closed, the window hides (it disappears from window listing but still stays running). "alltray" has some weird GTK-related bug (https://bugs.launchpad.net/alltray/+bug/589831; windows hide but unhiding doesn't do anything; they stay in the tray icon until the user undocks them). "trayer" complains that "another systray is already running" and there's no obvious workaround. This question here is to ask about possible minimalistic (as everything in XFCE is) solutions which don't involve manual compiling, and aren't an overkill like cairo-dock is (a rather bloated gnome-style application which creates a new large 'tray' instead of using the existing one). Thanks!

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• SQL 2008 Memory Usage

  - by Danilo Brambilla

  I have a SQL Server 2008 (ver 10.0.1600) running on a Windows Server 2008 R2 Enterprise server with 8 GB of physical ram. If I open Task Manager I can see on 'Physical Memory' section of 'Performance' tab that only 340 MB are Available of 8191 Total, but I can't see any process using such amount of memory. Please note SQL Server is memory limited to 6GB (Maximum Server Memory = 6000). If I open Sysinternals Process Explorer, I can see sqlsrvr.exe process has: Private Bytes: 227.000 K Working Set: 140.000 K Virtual Size: 8.762.000 K What does this means? Is there any way to free up this memory for other process? Why Virtual Size figure as allocated memory? I thought that Virtual Size was 'reserved memory' only.

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• How to mount remote samba share from local host with multiple groups?

  - by Dragos

  I am using mount.cifs to mount a remote samba share (both client and server are Ubuntu server 8.04) like this: mount.cifs //sambaserver/samba /mountpath -o credentials=/path/.credentials,uid=someuser,gid=1000 $ cat .credentials username=user password=password I mounted a user from local system with username and password with mount.cifs but the problem is that the user is part of multiple groups on the remote system and with mount.cifs I can only specify one gid. Is there a way to specify all the gids that the remote user has? Is there a way to: Mount the remote samba with multiple groups on the local system? Browse the mount from 1) with the terminal since I want to pass some files from samba as arguments to local programs. Other solutions would be: nautilus sftp:// which runs through gvfs; but the newer gnome does not write to disk the ~/.gvfs anymore so I can't browse it in terminal. And the last solution would be NFS but that means that I have to synchronize the uids and gids on the local system with the ones from the server.

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• How to manage a home-grown YUM package repo?

  - by TomOnTime

  There are plenty of websites that explain how to manage a mirror of YUM repos. I want to run a repo for my home-grown packages. Is there a good way to manage such repos? What I need to do: Manage 3 repos: unstable, testing, stable Self-service functions that let users add/remove/promote packages (promote means moving a package unstable?testing or testing-stable). ACLs that control which users/groups may add/remove/promote packages. Automatically re-sign packages as they move repo to repo (since the GPG key for "stable" should be different than "unstable") Automatically run "createrepo" to update repodata when needed. Suggestions?

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• AC/battery laptop issues(not a simple charging fix)

  - by Deric Hatchett

  Is it possible to run a laptop off the battery while the AC is plugged in? I can play games no problem while just the battery is plugged in, but obviously that means I have to let it charge after every hour or so. But, when I plug it in to charge, it can't handle any video games anymore. I thought it was the brick in the power cord going out, but I just bought a new one and it still doesn't work. The specs are actually better than the old cord. I think the problem is an over heating problem in the AC outlet, but if it charges the battery while I play, it would work just fine running solely off the battery.

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• FTP Access Denied when uploading to server

  - by Albert

  Ok, here's the story. I have a server running FTP 'out there' I can connect to it using the admin account, browse files, download files. When I try to upload files, I get 550 Access Denied. I have tried through FileZilla and command line. I have windows firewall turned off (on my machine) I can UPLOAD files from another machine (using the same admin account) on our local network (that means, same public IP) what is the problem? I am running Windows 7, Build 7100 and the other machine on the network is running XP SP3 The thing that gets me though, is that this worked for the last probably 4 months, without a problem, I get back in the office after a weekend today and it won't work...

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• how can I discover what keys are being sent when I press a mouse button?

  - by jcollum

  I'd like to map my Logitech MX Revolution keys in Visual Studio. More importantly, I'd like to do it without installing any software. Is this possible? I specifically want to map the two side buttons to View.NavigateBackward and View.NavigateForward. But I'm not sure what those keys are mapped to right now. I thought they were mapped to Ctrl-Tab and Shift-Ctrl-Tab, since they seem to behave that way in Notepad++, but that isn't working in VS. I'm on the work computer, which means 2 problems: I'm in Windows XP and installing software is frowned upon/monitored.

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• SGE: downtime planning

  - by mousee

  I need to plan a downtime for a maintenance of my environment (or some part of my environment) by means of Sun Grid Engine. Is it possible to somehow use backfilling information to tell the grid engine to plan only those jobs on cluster which are able to finish (i have backfilling information) till let's say 10 am next day? Can I then at 10 am rely on the fact that all compute nodes are clean, jobs are only queued, no job is planned and so that I can start maintenance? Thank you for your time. mousee

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• Apache on Mac Mavericks issue

  - by Michael

  Trying to run Apache so that I can create a testing server on my mac.When I start apache it starts, but it doesn't run (no connection to local host. Ill upload the unix,you'll see that after starting there is no processes, and I did a check to show you what was running on my port 80... I don't entirely know that means. Michaels-MacBook-Pro-3:~ michaelramos$ sudo apachectl start Michaels-MacBook-Pro-3:~ michaelramos$ ps aux | grep httpd michaelramos 348 0.0 0.0 2442000 624 s000 S+ 8:51AM 0:00.00 grep httpd Michaels-MacBook-Pro-3:~ michaelramos$ sudo apachectl start org.apache.httpd: Already loaded Michaels-MacBook-Pro-3:~ michaelramos$ sudo lsof -i ':80' COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ocspd 96 root 18u IPv4 0x8402f926599c58df 0t0 TCP dhcp-92-67.radford.edu:49267->108.162.232.196:http (ESTABLISHED) ocspd 96 root 20u IPv4 0x8402f926599c58df 0t0 TCP dhcp-92-67.radford.edu:49267->108.162.232.196:http (ESTABLISHED) ocspd 96 root 21u IPv4 0x8402f926599c50f7 0t0 TCP dhcp-92-67.radford.edu:49268->108.162.232.206:http (ESTABLISHED) ocspd 96 root 23u IPv4 0x8402f926599c50f7 0t0 TCP dhcp-92-67.radford.edu:49268->108.162.232.206:http (ESTABLISHED)

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• What is a SIP 'Gateway' and how is different from a SIP Proxy/Registrar?

  - by Shrey

  Recently I started looking at SIP implementation for a future work. I was reading (Googling) about what SIP means and how to go about implementing a end-to-end SIP enabled VoIP network. What I did not get is what use does a SIP Gateway is for? How different is it with respect to SIP proxy servers or a SIP DNS/Locator like server? I understand probably QoS would be one primary factor - like dedicating a set bandwidth for SIP/VoIP specific I/O over a network. Anything else? Can anyone help me with any other hints/pointers? I fully understand that is quite a basic question - but I really couldn't find any text which could clear my doubt about what 'Gateway' would mean in SIP context and what differentiates it from other SIP based network components (like Softphones, Proxies etc). Thanks a lot.

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• SSL certificates with password encrypted key at hosting provider

  - by Jurian Sluiman

  We are a software company and offer hosting to our clients. We have a VPS at a large Dutch datacenter. For some of the applications, we need an SSL certificate which we'd like to encrypt with a password protected keyfile. Our VPS reboots now and then because of updates whatsoever, but that means our apache doesn't start right away because the passwords are needed. This results in downtime and is of course a real big problem. We can give the passwords to our VPS datacenter, or create certificates based on keyfiles without passwords. Both solutions seem not the best one, because they compromise the security of our certificates. What's the best solution for this issue?

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• Keeping rackspace vserver alive

  - by mit

  It appears to me that rackspace somehow freezes cloud VMs after some idle time. This means the first page request to a php page takes much longer to respond than the subsequent requests. I am actually querying a machine with wget from a different host now to keep it "alive". But I wonder what frequency would be necessary. Does anyone know the time period after which they send a VM to "sleep"? I guess it would be some minutes. EDIT: There is no caching involved on the php site. It just recently moved from another vhost and there was never such latency on the first request.

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• Access permission /opt/ in Ubuntu

  - by user1201239

  I want to access my /opt/ folder I have found following commands for giving access permission. But not sure what is the purpose of this commands which one is the better to use it to maintain security and access permission both. Please explain me the purpose or what this different numbers means in security permission ? here are they , sudo chmod 755 -R /opt/ sudo chmod 755 /opt/ sudo chmod 775 /opt/ sudo chmod 777 /opt/ I dint know these commands so what I use to do previously was "gksudo nautilius" then rightclick- change the owner from root to current usergroup But now as I have found this commands I would like to know Which one should i use ? and what they do ?

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• Redundant Router and Load Balancing vs. DDoS attack

  - by colgatta

  With a small server farm at a hoster with great support and conditions, I worry about the increasing number of DDoS attacks against this hoster (not my web project, but other clients on the same location). I have booked a redundant router and load balancer as managed service with this hoster to share the load with all the dedicated servers. However, I was lost again today because another one's project was attacked with DDoS for hours :-( Each hour means hundreds of dollars loss whenever my adserver and tracking is not reachable. Even time-out advertising have to be paid by me but can not be resold to my clients without the servers being available. All the time, the servers, the load and traffic is OK and health, but no chance to keep this stable/online if the hoster is vulnerable. Anyone has ideas or suggestions how to protect - even against DDoS?

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• Laptop charger dying after plugging in?

  - by Corey

  My laptop charger's transformer has a green light on it that indicates that it's plugged in and working. When I plug it into the wall, the light goes on as expected. As soon as I plug it into the laptop, the light immediately turns off and my laptop doesn't get any charge. After that, the charger's light doesn't turn green again, even though it is still plugged into an outlet. I need to unplug it from the wall and wait a few minutes. It's strange - unplugging and immediately re-plugging it does not bring back the charge; I have to wait. Is this a charger issue or a laptop issue? Edit: Hooked the charger into a voltmeter and power went through fine. I guess this means that it's a short in my laptop itself. What are my options now?

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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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• txt file descriptor in lsof

  - by wfaulk

  In my experience, files that have the file descriptor of txt in lsof output are the executable file itself and shared objects. The lsof man page says that it means "program text (code and data)". While debugging a problem, I found a large number of data files (specifically, ElasticSearch database index files) that lsof reported as txt. These are definitely not executable files. The process was ElasticSearch itself, which is a java process, if that helps point someone in the right direction. I want to understand how this process is opening and using these files that gets it to be reported in this way. I'm trying to understand some memory utilization, and I suspect that these open files are related to some metrics I'm seeing in some way. The system is Solaris 10 x86.

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• How to efficiently dump a huge MySQL innodb database?

  - by Jagbir

  I got an Ubuntu 10.04 production MySQL database server where total size of database is 260 GB while size of root partition is itself 300 GB where DB is stored, essentially means around 96% of / is full and there's no space left for storing dump/backup etc. No other disk is attached to server as of now. My task is to migrate this database to other server sitting in different datacenter. Question is how to do that efficiently with minimum downtime? I'm thinking in line of: Request to attach an extra drive to server and take a dump in that drive. Transfer dump to new server, restore it and make new server slave of existing one to keep data in sync When migration is needed, break replication, update slave config to accept read/write requests and make old server read-only so it won't entertain any write requests and tell app developers to update there config with new IP address for db. What's your suggestions to improve this or any alternate better approach for this task?

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• How do I launch a process as a specific user at startup on OS X?

  - by Scott Bonds

  I would like to run a script as a particular user on startup (not on login). I thought a launchd LaunchDaemon would do it, but 'man launchd' says: "If you wish your service to run as a certain user, in that user's environment, making it a launchd agent is the ONLY supported means of accomplishing this on Mac OS X. In other words, it is not sufficient to perform a setuid(2) to become a user in the truest sense on Mac OS X." They aren't kidding--when I try to run my script as a LaunchDaemon it doesn't work. In particular I'm trying to automate some keychain operations using the 'security' command, and it won't let me change the default keychain when I run the script through LaunchDaemon, though the script works fine when run using sudo from a shell. A LaunchAgent won't work, because the goal is for the proces to run without a user logging in and LaunchAgents only run when someone logs in. I looked at cron and the @reboot directive and that looks promising, but I read that cron is deprecated on OSX.

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• What do I need to connect a hard disk to my laptop via non powered eSata?

  - by Ludo

  Hi there. I'm looking at getting a hard disk for my laptop (OCZ Vertex 2 SSD) which I would like to connect via eSata. My laptop has an eSata port, but it's not powered (Thinkpad T410). I presume this means I need more than just an eSata to eSata cable as it needs power, so does this mean I need a caddy for the hard disk as well which will provide power to the drive, or do I need one of them eSata cables that has a USB attachment too? I don't think the drive will come with a power supply. I realise this seems simple but I can't find an obvious answer online. Thanks for any assistance! Ludo.

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