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• Potential issues to consider when using debootstrap for different Ubuntu distros

  - by BrainCore

  We currently run Lucid on top of Xen. Using debootstrap, we have created many jailed environments for Lucid (10.04), Maverick (10.10) and Natty (11.04). We're considering creating an Oneiric environment as well. However, we're beginning to wonder what the consequences of doing so are. What incompatibilities should we watch out for? The Lucid base runs on the 2.6.32 Kernel, and happens to be running on Amazon EC2 (Xen). We realize that Oneiric when installed from scratch comes with the 3.0 Kernel. Also, if we were to upgrade the Lucid base to Oneiric (including the Kernel), what would we have to watch out for to ensure that the Lucid, Maverick, and Natty jailed environments still work fine?

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• Disable remote session timeout on Win Server 2012 R2

  - by Sarchophagi

  For botting purposes, I have to keep my Win Server 2012 R2 running without logging-off after I disconnect from Remote Session. Found information about it here: http://technet.microsoft.com/en-us/library/cc754272.aspx but I just its for Win Server 2008 and doesn't seem to work on 2012 version. Could you guys help me setting infinite timout? EDIT: Tried this answer Changing the login timeout for Windows Remote Desktop Services but without results.. MORE DETAIL ABOUT WHAT I NEED: I connect to Amazon ECL Istance with "Remote Desktop Conection". I need to put remote server to keep running as if an user was normally remotely logged in, and prevent it from going to that log-out stand-by screen, usually blue coloured @ winserver2012, because i'm using macros that take screenshots of screen and find bitmap positions, do clicks, move mouse and stuff..

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• How do I get a hold of the Reply-To header and remunge it in postfix

  - by Mikhail

  I have a legacy application that emails via php. 5% of the emails aren't going through. The solution is to route all email through a fancy verified mail server like Amazon's SES. I am having some trouble implementing this functionality. It seems this guy had a similar problem. My question is where in postfix can I set a filter that will take as input the the message headers, so that I can manually set the From field and the Reply-To field to [email protected] and [email protected], respectively. Where whatever_php_wants is dictated by the php program and the users registration email. I know where to set the noreply portion, but I don't know the exact place in postfix's configuration files where I can intercept complete emails and pass them to a script. Edit So I want emails to look like: FROM: [email protected] REPLY-TO: the_users_address@their_email_service.com

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• Transition domain to new web host without waiting for DNS propagation

  - by jcmoney

  I was considering switching to Amazon EC2 to host my website to handle more traffic. It seems like I would have to update DNS records to point to the new server but I was wondering if there was a way to avoid having to wait for the new DNS record to propagate. Putting the code on both hosts would not work for me since the app writes to a database pretty frequently. I thought about just using a meta redirect or php redirect on the old host to redirect to the new host ip but was wondering if there's a better more accepted way of doing this.

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• Is it possible to a VM inside a VM (e.g., KVM on Vmware)?

  - by lorin

  I'd like to do some development on Eucalyptus, an open source project which provides an Amazon EC2 interface for launching virtual machine instances on a collection of privately managed nodes. I'd really like to be able to do some of the development on my desktop, rather than having to deploy Eucalyptus on our shared local cluster each time I make a change to the source code. (Especially since there are a group of us sharing that test cluster). Unfortunately, my desktop machine is a Mac, which won't run Eucalyptus natively. I do have VMWare Fusion, and it would be really nice if I could do my Eucalyptus testing inside a VMWare instance. The problem is, to test out Eucalyptus, it will have to launch (KVM or Xen) VM instances. I've got no idea if it's possible to actually launch a KVM or Xen instance inside a VMWare instance.

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• Postgres 9.0 locking up, 100% CPU

  - by Jake

  We are having a problem where our Postgres 9.0 server occasionally locks up and kills our webapp. Restarting Postgres fixes the problem. Here's what I've been able to observe: First, usage of one CPU jumps to 100% for a few minutes Disk operations drop to ~0 during this time Database operations drop to 0 (blocks and tuples per sec) Logs show during this time: WARNING: worker took too long to start; cancelled WARNING: worker took too long to start; cancelled No Queries in logs (only those over 200ms are logged) No unusually long-running queries logged before or during Then the second CPU jumps to 100% The number of postgres processes jumps from the usual 8-10 to ~20 Matched by a spike in Postgres Blocks per second (about twice normal) Logs show LOG: could not accept SSL connection: EOF detected Queries are running but slow Restarting postgres returns everything to normal Setup: Server: Amazon EC2 Large Ubuntu 10.04.2 LTS Postgres 9.0.3 Dedicated DB server Does anyone have any idea what's causing this? Or any suggestions about what else I should be checking out?

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• Digital Blue Digital Movie Creator 3.0 driver

  - by hjdx

  I'm having a complete 'mare of a time trying to use my schools Digital Blue cameras. We've got the model 3 ones, but can't find the driver disc and using the Windows Hardware Installation Wizard gets me no where! Can you help me to find the driver? When I've used it at my old school it had a piece of software called the Digital Movie Creator, which I've heard you can use to make stop-motion films, which is what I want to do! This is what it looks like http://www.amazon.co.uk/Digital-Movie-Creator-1GB-Card/dp/B000LP30LA/ref=sr_1_2?ie=UTF8&s=software&qid=1265928833&sr=1-2

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• vsftp login errors 530 login incorrect

  - by mcktimo

  Using Ubuntu 10.04 on an aws ec2 instance. I was happy just using ssh but then a wordpress plugin needs ftp access...I just need ftp access for one site www.sitebuilt.net which is in /home/sitebuil. I installed a vftpd and pam and followed suggestions that got me to the following state /etc/vftpd.conf listen=YES anonymous_enable=NO local_enable=YES write_enable=YES dirmessage_enable=YES use_localtime=YES xferlog_enable=YES connect_from_port_20=YES xferlog_file=/var/log/vsftpd.log secure_chroot_dir=/var/run/vsftpd/empty pam_service_name=vsftpd rsa_cert_file=/etc/ssl/private/vsftpd.pem guest_enable=YES user_sub_token=$USER local_root=/home/$USER chroot_local_user=YES hide_ids=YES check_shell=NO userlist_file=/etc/vsftpd_users /etc/pam.d/vsftpd # Standard behaviour for ftpd(8). auth required pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed # Note: vsftpd handles anonymous logins on its own. Do not enable pam_ftp.so. # Standard pam includes @include common-account @include common-session @include common-auth auth required pam_shells.so # Customized login using htpasswd file auth required pam_pwdfile.so pwdfile /etc/vsftpd/passwd account required pam_permit.so session optional pam_keyinit.so force revoke auth include system-auth account include system-auth session include system-auth session required pam_loginuid.so /etc/vsftpd_users sitebuil tim /etc/passwd ... sitebuil:x:1002:100:sitebuilt systems:/home/sitebuil:/bin/sh ftp:x:108:113:ftp daemon,,,:/srv/ftp:/sbin/nologin /etc/vsftpd/passwd sitebuil:Kzencryptedpwd /var/log/vftpd.log Wed Feb 29 15:15:48 2012 [pid 20084] CONNECT: Client "98.217.196.12" Wed Feb 29 15:16:02 2012 [pid 20083] [sitebuil] FAIL LOGIN: Client "98.217.196.12" Wed Feb 29 16:12:33 2012 [pid 20652] CONNECT: Client "98.217.196.12" Wed Feb 29 16:12:45 2012 [pid 20651] [sitebuil] FAIL LOGIN: Client "98.217.196.12"

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• Server high memory usage at same time every day

  - by Sam Parmenter

  Right, we moved one of our main sites onto a new AWS box with plenty of grunt as it would allow us more control that we had before and future proof ourselves. About a month ago we started running into issues with high memory usage at the same time every day. In the morning an export is run to export data to a file which is the FTPed to a local machine for processing. The issues were co-inciding with the rough time of the export but when we didn't run the export one day, the server still ran into the same issues. The export has been run at other times in the day since to monitor memory usage to see if it spikes. The conclusion is that the export is fine and barely touches the sides memory wise. No noticeable change in memory usage. When the issue happens, its effect is to kill mysql and require us to restart the process. We think it might be a mysql memory issue, but might just be that mysql is just the first to feel it. Looking at the logs there is no particular query run before the memory usage hits 90%. When it strikes at about 9:20am, the memory usage spikes from a near constant 25% to 98% and very quickly kills mysql to save itself. It usually takes about 3-4 minutes to die. There are no cron jobs running at that time of the day and we haven't noticed a spike in traffic over the period of the issues. Any help would be massively appreciated! thanks.

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• Nginx & Passenger - failed (11: Resource temporarily unavailable) while connecting to upstream

  - by Toby Hede

  I have an Nginx and Passenger setup that is proving problematic. At relatively low loads the server seems to get backed up and start churning results like this into the error.log: connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream My passenger setup is: passenger_min_instances 2; passenger_pool_idle_time 1200; passenger_max_pool_size 20; I have done some digging, and it looks like the CPU gets pegged. Memory usage seems fine passenger_memory_stats shows at most about 700MB being used, but CPU approaches 100%. is this enough to cause this type of error? Should i bring the pool size down? Are there other configuration settings I should be looking at? Any help appreciated Other pertinent information: Amazon EC2 Small Instance Ubuntu 10.10 Nginx (latest stable) Passenger (latest stable) Rails 3.0.4

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• Web browser being selective about the sites that it will visit.

  - by Andrew Doran

  I've been trying to help my father-in-law with this problem but haven't been able to get anywhere. Since the weekend the web browsers on his computer (Chrome and Internet Explorer on Windows XP) will only let him get to certain sites - for example, he is able to conduct his online banking but he cannot visit www.bbc.co.uk, www.amazon.co.uk or www.ancestry.com. There is another computer in the house that goes via the same router and this can connect to both, which suggests it is his machine. I tried running a tracert to www.bbc.co.uk and managed to get through, but the web browser hangs with a message that it is waiting for a response. I tried using the WinSockFix tool in case it was anything to do with a recent registry change but that didn't work either. He can't think of anything that he recently did on his machine to cause the problem. Can anyone help?

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• How to change MySQL data directory?

  - by Jonathan Frank

  I want to place my databases in another directory, so I can store them in an ESB (elastic block storage, just a fancy name for a virtualized harddisk) together with my web-apps and other persistent data. I have tried to walk through a tutorial at http://crashmag.net/change-the-default-mysql-data-directory-with-selinux-enabled. Everything seems fine until I type this command: # semanage fcontext -a -t mysqld_db_t "/srv/mysql(/.*)?" Then the command fails and tells me that mysqld_db_t is an invalid SELinux context even if the default MySQL data directory is labelled with this context. I am running Fedora 15 on Virtualbox (behaves like an ordinary x86-compatible box) and Amazon EC2 (based on Xen) so the tutorial should be compatible. It is also worth to mention that turning off SELinux globally or just for the MySQL process is not an option, because such a solution will decrease the security of the system if a hacker gains access to the system via the MySQL server. I have never seen this problem before I changed to the Redhat/Fedora architecture, so it could be a distribution specific issue. Any help is highly appreciated

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• What are the licensing differences between Windows 8 Professional x64 fqc-05955 and fqc-05956?

  - by Razvan Panda

  If I do a search for Windows 8 Professional x64 in my country, the only version I can find is having the code fqc-05955 and is labeled OEM. If I perform same search on amazon.com, the only version I can find is having the code fqc-05956 and is labeled System Builder. There's not much information about licensing of Windows 8 that I could find. According to this article when using System Builder it can be transferred from one computer to another. What are the differences in licensing between those 2? Is fqc-05955 transferable from one hardware to another like System Builder is? Can I install fqc-05955 on a computer I already own that has no prior windows licensing? I am asking this, since many stores that sell fqc-05955 say it can only be bough with a computer. Thanks for your help!

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• How can a Linux Administrator improve their shell scripting and automation skills?

  - by ewwhite

  In my organization, I work with a group of NOC staff, budding junior engineers and a handful of senior engineers; all with a focus on Linux. One interesting step in the way the company grows talent is that there's a path from the NOC to the senior engineering ranks. Viewing the talent pool as a relative newcomer, I see that there's a split in the skill sets that tends to grow over time... There are engineers who know one or several particular technologies well and are constantly immersed... e.g. MySQL, firewalls, SAN storage, load balancers... There are others who are generalists and can navigate multiple technologies. All learn enough Linux (commands, processes) to do what they need and use on a daily basis. A differentiating factor between some of the staff is how well they embrace scripting, automation and configuration management methodologies. For instance, we have two engineers who do the bulk of Amazon AWS CloudFormation work, and another who handles most of the Puppet infrastructure. Perhaps a quarter of the engineers are adept at BASH shell scripting. Looking at this in the context of the incredibly high demand for DevOps skills in the job market, I'm curious how other organizations foster the development of these skills and grow their internal talent. Scripting doesn't seem like a particularly-teachable concept. How does a sysadmin improve their shell scripting? Is there still a place for engineers who do not/cannot keep up in the DevOps paradigm? Are we simply to assume that some people will be left behind as these technologies evolve? Is that okay?

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• Where can I compare monitors with a given VESA mount?

  - by Dan Rasmussen

  I am looking into purchasing a dual-monitor setup, and need to purchase two monitors with VESA MIS-D mounts. My only problem is that that information doesn't seem to be readily available on most shopping websites. Neither Amazon nor Newegg seem to have the information searchable or filterable. I could shop for monitors, then Google around to see if they support VESA MIS-D, but is there a better way? Is there a resource (not necessarily a store - once I find a monitor I can shop elsewhere) where I can browse a variety of monitor specs and reviews while only looking at monitors with a certain VESA mount?

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• What is a good and safe way of sharing certificates?

  - by Kaustubh P

  I have a few certificates, that are used as authentication, to ssh into my servers on the Amazon cloud. I rotate those certificates weekly, manually. My question is, I need to share the certificates with some colleagues, a few on the LAN, and a few in another part of the country. What is the best practice to share the certificate? My initial thoughts were Dropbox and email. We dont host dedicated email servers with encryption and all, and dont have a VPN. Thanks.

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• 0 connected nodes in datastax opscenter

  - by gansbrest

  Installed opscenterd on the separate node outside of the cluster, but within firewall ( aws security group ). Tested all possible ports between agents and opcenter server. No errors in the log.. 2013-10-30 01:07:23+0000 [FC_Cluster] INFO: Initializing event storage. 2013-10-30 01:07:23+0000 [FC_Cluster] INFO: Attempting to load all persisted alert rules 2013-10-30 01:07:23+0000 [FC_Cluster] INFO: Done loading persisted alert rules 2013-10-30 01:07:23+0000 [FC_Cluster] INFO: Done initializing event storage. 2013-10-30 01:07:23+0000 [FC_Cluster] INFO: Done loading persisted scheduled job descriptions 2013-10-30 01:07:23+0000 [FC_Cluster] INFO: OpsCenter starting up. 2013-10-30 01:07:23+0000 [] INFO: Finished starting new cluster services for FC_Cluster 2013-10-30 01:08:04+0000 [FC_Cluster] INFO: Agent for ip 10.34.10.185 is version u'3.2.2' 2013-10-30 01:08:04+0000 [FC_Cluster] INFO: Agent for ip 10.32.37.251 is version u'3.2.2' 2013-10-30 01:08:04+0000 [FC_Cluster] INFO: Agent for ip 10.82.226.252 is version u'3.2.2' The most interesting part that I can see some data in the opscenter UI, when I stop agents, there is no data displayed, when I start - it show up again, but at the same time it shows 0 connected nodes. Storage capacity is even funnier - 3 of 0 nodes.. Any ideas why that could be happening?

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• "Couldn't resolve host" for any external content

  - by scatteredbomb

  On our site we run a few different scripts for various sites (uploading to amazon s3, data from chartbeat, script to count twitter followers) and all of them just stop working from time to time. They work most days, but then some days (like today) they all just stop working. This simple script to get follower count into PHP $url = "http://twitter.com/users/show/username"; $response = file_get_contents ( $url ); $t_profile = new SimpleXMLElement ( $response ); $count = $t_profile->followers_count; Just sits there for a couple minutes, then finally spits out an error that says "Couldn't resolve host". Any script we use for an external site gives us this error. I'm not really sure where to check what's blocking these connections all of a sudden, and why it seems to work most times, then doesn't for a day or so, then works again. Any tips? Update: Contents of resolv.conf search 147.225.210.rdns.ubiquityservers.com nameserver 72.37.224.5 nameserver 72.37.224.6

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• Has anyone used products by StorSimple? [closed]

  - by AlamedaDad

  Their products are storage systems similar to NetApp, but their "hook" is they provide automated tiered storage with the third tier being Cloud providers like Amazon and Azure. They have an interesting story in which they provide primary SAN/iSCSI storage to VMWare and Exchange and at the same time do snaphots to the Cloud. This provides a possible DR option if you have a second system at an alternate location. I was impressed, but I've never heard of them so I'm looking for input and advise on the product. Thanks in advance...

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• ubuntu 12.04 copy whole server

  - by Jiechao Li

  all. My company host all the software, including application and website in one local ubuntu server. But recently we start to use Amazon EC2, and want to move the whole server to cloud. Is there anyway to copy the entire server to EC2? OS is the same, ubuntu 12.04, and just one server, and one user account. On EC2 is also one instance, one account. I don't know whether there is a simple and quick way to do that. Thanks a lot!!

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• IE8 Windows 7 (64bit) security certificate problem

  - by Steve

  Hi, We have just received some new computers for use in the office (Dell Vostro). They seem to work fine in the main. When we use IE8 to go to some web pages such as yahoo mail it tells us: “There is a problem with this websites security certificate” If we have a look at the details it says: “This certificate cannot be verified up to a trusted certification authority” This however works correctly in Firefox. I don't understand why I should get such an error message, should this not just work? I don't think its anything to do with the certificate itself as this is happening on www.yahoo.co.uk and other commercial (amazon I think?) sites. I think there is something off with the PCs setup. The PC has Windows 7 (64 bit) and Norton Internet Security installed. Any ideas as to why this is happening? Thanks

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• Digital Blue Digital Movie Creator 3.0 driver

  - by user27977

  I'm having a complete 'mare of a time trying to use my schools Digital Blue cameras. We've got the model 3 ones, but can't find the driver disc and using the Windows Hardware Installation Wizard gets me no where! Can you help me to find the driver? When I've used it at my old school it had a piece of software called the Digital Movie Creator, which I've heard you can use to make stop-motion films, which is what I want to do! This is what it looks like http://www.amazon.co.uk/Digital-Movie-Creator-1GB-Card/dp/B000LP30LA/ref=sr_1_2?ie=UTF8&s=software&qid=1265928833&sr=1-2

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• Looking for FTP server that allows user management from database

  - by hughesdan

  I'm planning a server application that will handle files uploaded via FTP. The application must parse text documents that it receives and write them to a database (most likely a document-oriented database like Mongo). And the application must also relay all large binary files it receives to Amazon S3 for storage and hosting. I'd like to manage all aspects of the FTP server programmatically. For example, when a user registers via a web page the application should be able to create the user account in the database and provision a directory on the server for receiving files. I'm using a Linux server but am otherwise open to considering any programming language or framework. I experimented with VSFTPD but didn't like the way the application relies on config files and the creation of users and directories via the command line. Can someone please recommend what server framework I should consider? I'm a little biased toward solutions that leverage Javascript/Nodejs or Python. However, I'm open to anything that can run on a Linux box.

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• How to handle server failure in an n-tier architecture?

  - by andy

  Imagine I have an n-tier architecture in an auto-scaled cloud environment with say: a load balancer in a failover pair reverse proxy tier web app tier db tier Each tier needs to connect to the instances in the tier below. What are the standard ways of connecting tiers to make them resilient to failure of nodes in each tier? i.e. how does each tier get the IP addresses of each node in the tier below? For example if all reverse proxies should route traffic to all web app nodes, how could they be set up so that they don't send traffic to dead web app nodes, and so that when new web app nodes are brought online they can send traffic to it? I could run an agent that would update all the configs to all the nodes, but it seems inefficient. I could put an LB pair between each tier, so the tier above only needs to connect to the load balancers, but how do I handle the problem of the LBs dying? This just seems to shunt the problem of tier A needing to know the IPs of all nodes in tier B, to all nodes in tier A needing to know the IPs of all LBs between tiers A and B. For some applications, they can implement retry logic if they contact a node in the tier below that doesn't respond, but is there any way that some middleware could direct traffic to only live nodes in the following tier? If I was hosting on AWS I could use an ELB between tiers, but I want to know how I could achieve the same functionality myself. I've read (briefly) about heartbeat and keepalived - are these relevant here? What are the virtual IPs they talk about and how are they managed? Are there still single points of failure using them?

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• Green System Administrator looking for helpful tips

  - by Joshua Anderson

  I have just been promoted to Systems Administrator for our product. We are designing a application that communicates with the cloud(Amazon EC2). I will be in charge of maintaining all Instances and their underlying components. So far this involves a set of load balanced services instances that connect to a central DB in a multi-tennant DB design. Im interested in what other Sys. Admins have discovered as invaluable tools or practices. Any resources provided will be greatly appreciated.

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