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• Ubuntu Software RAID 0 on AWS Does Not Survive Reboot

  - by Eric J.

  I'm experimenting with creating a software RAID 0 device from 4 EBS volumes on Ubuntu 9.10 running at Amazon AWS following this guide: http://alestic.com/2009/06/ec2-ebs-raid The device appears (and according to SysBench is 3.5x faster than a regular attached EBS volume). Problem is, when I reboot the instance, all files on the RAID device are gone. The device is available and mounted where expected, but contains no files. I am able to write new files to it, which survive until the next reboot.

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• How to reliably recieve message from AWS that my instance was rebooted / terminated / stopped?

  - by Andrew Smith

  I have Nagios, and I want it to stop monitoring instances when they are stopped from the console. The requirements are: The message passed from AWS is 100R% reliable, e.g. when Nagios is down, and the message cannot be delivered, it will be re-delivered promptly when Nagios is up The message will pass quickly There is no need to scan status of all instances via EC2 API all the time, but only once a while Many thanks!

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• EBS with RAID0 (striping) and restoring snapshots

  - by grourk

  We have a MySQL database on EC2 and are looking at the disk IO performance there. Currently we have a single EBS volume with XFS and take snapshots for backup. It seems that a lot of people have seen significant performance gains by striping across multiple EBS volumes with software RAID. If this is done, how does one take snapshots and ensure the consistency of the file system? It seems to me that restoring the file system from multiple snapshots could be tricky.

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• Does AWS resolve same-datacenter hostnames to 10.* addresses for different customer accounts?

  - by Scott Ritchie

  If I bring up two Amazon EC2 instances and run nslookup on one for the other's hostname, amazon will return a 10.* address. This is routable within amazon, and works just fine. But does this work between different accounts? If I use one of my nodes to nslookup a hostname belonging to another customer (but still in the same datacenter) will it resolve as a 10.* address or will it give the standard public IP?

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• How to move S3 bucket to different location

  - by skrat

  We use S3 for storing millions of entries in our webapp, now we move the whole thing to EC2, EU servers, and we also want to move that S3 data to EU. But the bucket we use is in US, and there seem to be no tool to move whole bucket content to different bucket. There is also problem on how to synchronize the data later on when we switch to EU bucket, the data that will be created meanwhile while the migration was running.

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• Auto re-attach EBS volume on start-up?

  - by Phillip Oldham

  I'm setting up a database server on EC2, and I need to ensure that an EBS volume is automatically attached and is available before the database service starts up. I'm using SMF so I can test whether a particular filesystem is available before starting the db service, so there's no problem from that perspective, however I'm not quite sure how to tell the server to auto-attach the EBS volume during/after boot. What would be the best strategy for this?

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• Windows Server not installing audio drivers properly

  - by user34322

  I am trying to install a dummy sound card on a Windows Server machine (in Amazon EC2 cloud) in order for one of my application to work. I'm trying to accomplish that with Virtual Audio Cable and REAUDIO3. Both tools managed to install a new device on my Windows XP machine, but on Windows Server, no new devices appear. Windows Audio and Plug and Play services are Started and Automatic. ANY ideas are greatly appreciated.

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• Differences between Fedora servers

  - by Yarin

  I'm using Amazon EC2 and trying to choose a machine image (AMI) for my project. It seems all their LAMP AMIs are Fedora Core 4, but this seems like quite an old version, considering the current release is apparently Fedora 12, and < 10 releases are no longer supported. My question is how significantly different are the early fedora releases- is it crazy to be on versions 4 or even 8? (I realize this is probably a broad question)

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• Windows Server not installing audio drivers properly

  - by Adrian

  I am trying to install a dummy sound card on a Windows Server machine (in Amazon EC2 cloud) in order for one of my application to work. I'm trying to accomplish that with Virtual Audio Cable and REAUDIO3. Both tools managed to install a new device on my Windows XP machine, but on Windows Server, no new devices appear. Windows Audio and Plug and Play services are Started and Automatic. ANY ideas are greatly appreciated.

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• How can I match an AWS account number to a key and secret

  - by iwein

  My client gave me a key and a secret to manage his EC2 things, but to make one of my AMI's available to run I have to fill in the Account Number. Is it possible to deduce the account number from the key and the secret? Obviously I also asked the client for this information, but since it's weekend and I'm not fond of waiting I wanted to see if I could figure it out myself. Have you done this before?

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• ls hangs after NFS server reboot

  - by Apikot

  I've got server A and server B. B acts as an nfs server, A mounts from B. Both are running on EC2. Sometimes I have to shut down B and start a new instance (identical instance). After B is back up, trying to do anything inside the mounted directory on A (ls for example) just hangs. I'm trying to set up a cron that checks the status of the mount, and remounts if anything is wrong. Is there any way to check the status of a mount?

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• AWS Free Usage Tier + Cloudflare... possible?

  - by crashintoty

  If I throw my MySQL/PHP app up on a Amazon EC2 instance (using their AWS Free Usage Tier program) and couple it with CloudFlare (the free plan of course) roughly how many daily visitors can I comfortably handle before performance starts to suffer? Just looking for a rough estimate or educated guess - I understand this setup might be less than ideal but I'm still very curious nonetheless. Thanks in advance

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• Amazon Elastic Compute Cloud: how to set up a small and persistent test machine?

  - by mjustin

  Hello, is there a short tutorial available which shows how I can set up a small Linux server on Amazon EC2 so that I can configure it and launch it when needed? I understand that there is EBS to provide a persistent storage and that an image can be booted right from EBS. There are also existing images which are perfect starting points, with Linux installed, so I simply have to 'copy' somehow an existing image to EBS, and configure it there. Is there some article which guides through these steps?

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• Creating own Amazon Machine Image - Kernel panic

  - by amra

  I have created own AMI and registered it on Amazon EC2. But while AMI startup I receive following error: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1) The image is running locally without any problems. fstab contains: proc /proc proc defaults 0 0 /dev/sda1 / ext3 relatime,errors=remount-ro 0 1 thx for help

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• What happens when a load balancer fails?

  - by CowKingDeluxe

  Let's say I'm using Amazon's EC2 load balancer. I have it hooked up to two instances (excuse me if my terminology isn't correct). What happens if the load balancer fails? Do both instances fail to work now?

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• DNS Setting keeps changing on me

  - by Chiggins

  So on my Windows Server 2008 box, I have a DNS server installed on it. For some reason, every ten minutes or so, the Host (A) address for the computer keeps on changing to its internal private IP address. I want it to have its public address for Active Directory purposes, but it keeps changing itself back to the private IP address. Any idea as to why, and how to change it? If it makes a difference, this is an Amazon EC2 server. Thanks

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• Service to automatically restart an instance that terminates unexpectedly?

  - by Phillip Oldham

  We have a DB server running on EC2 which we'd like to ensure stays up. Are there any services, or packages/software I can install somewhere, to monitor and restart servers if they terminate unexpectedly?

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• IPtables AWS EC2 NAT/Reverse NAT - For Reverse Proxy style setup but with IPtables

  - by Mark

  I was thinking initially needing to do a reverse proxy or something so I could get some SSL/TLS traffic look like it is being terminated at a server and IP address in the AWS cloud, and then that traffic is forwarded onto our actual web servers that aren't in the cloud... I've not done much iptables pre and post routing before Dnat or Snat which I know are the things I need or a combination of the things I need in order achieve what i'm trying. Things to note:- Client/User - Must not be able to see backend IP address and only see the IP address of the cloud box https (TLS/SSL) - connection shouldn't be terminated at the cloud box, it should act like a router almost EC2 instance - Has only one network interface available to play with... this is thus an (internet <- internet) type of routing going on. EC2 instance IP address is already more or less behind a NAT that I have no control over, for example... Public ip address could be 46.1.1.1 but instance IP will be 10.1.1.1. Connections from client will go to 46.1.1.1 which will end up at the instance and on interface 10.1.1.1. The connection from the client then needs to be forwarded (DNAT) onto the backend web servers which are back out on the internet (SNAT). Possibly a part of the problem could be that the SNAT will need to be set to the external interface of the instance and I wonder if this makes it harder for IPtables to track the connection? So looking to basically, have it look as though connections are terminating at this server and its IP address. Whereas all that's really happening is the https request and connection is being forwarded straight onto another internet facing web server. How possible does that sound?

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• growing EBS RAID volume

  - by Ryan Fernandes

  I've created a RAID0 configuration with two 1GB EBS volumes, mounted at /dev/md0 using mdadm and formatted with XFS Next, I copied some files over to fill the volume to around 30% of its capacity (of 2GB) I then created snapshots of the volumes using ec2-consistent-snapshot and created volumes of the said snapshots but specified the volume size to be 2GB (effective doubling the capacity on each disk) I then spun up a new instance, assembled the RAID0 configuration on /dev/md0 from the 2 volumes mentioned above and mount it to /vol df -hT showed /vol as 2GB (as expected) Now I ran sudo xfs_growfs -d /vol. The command completed normally but reported blocks changed from 523776 to 524160 (only!) and df -hT still showed /vol as 2GB (instead of the expected 4GB) I rebooted, remounted, reassembled the RAID but it still reports the old size. Any clue as to what went wrong?

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• How to get nginx to serve up on an elastic IP

  - by geekbri

  I have an EC2 instance which is serving up PHP pages with nginx and php-fpm. This works perfectly fine when accessed through the public DNS for the instance. However if I try to access the site with the Elastic IP which is bound to it, it serves up a generic "Welcome to nginx" page, even though in my server block i have listen 80 (which i thought listened on all incoming IPs on port 80). Here is my nginx config. server { listen 80; access_log /var/log/nginx/access.log; root "/var/www/clipperz/"; index index.html index.php; # Default location location / { try_files $uri $uri/ index.html; } # Parse all .php file in the $document_root directory location ~ .php$ { include fastcgi_params; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } }

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• Error after installing mysqlnd_ms

  - by user997226

  I am working on Amazon EC2 using the Amazon Linux AMI which is based on CentOS. I have installed php54 and php54-mysqlnd. I then do a "sudo pecl install myslqnd_ms" This installs fine. I add the extension into the php.ini file. Then I start httpd, and when I do in the error log I see: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysqlnd_ms.so' - /usr/lib64/php/modules/mysqlnd_ms.so: undefined symbol: mysqlnd_globals in Unknown on line 0 Googling this lead me to: https://bugs.php.net/bug.php?id=62276&edit=1 and http://forums.famillecollet.com/viewtopic.php?id=242 neither of which helped me much. I am trying to stick to stock pre built binaries from the main YUM repo if possible. What would be the best solution here? Thanks in advance

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• Why does Amazon release private keys instead of public keys?

  - by S37H

  My brain is wrapped around the axle on public and private keys. When you create a cloud server (instance) on Amazon's EC2 service and then want to connect to it via SSH, Amazon requires you to download private a key to make the connection. Doesn't the idea behind public/private key suggest that Amazon should be require you to download a public one? Further, if I set up an SFTP server for a customer to use, should I be installing their key on the server or giving them a key from the server? In either case, should it be a public or private key?

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• How to deploy local project to Amazon

  - by Nai

  I have a small webapp written in Python/Django which works fine on my local machine. I've been tinkering and setting up my server on the free tier of Amazon EC2 by following online tutorials. However, the tutorials I have found so far shows you how to setup your instance and stops there. So my question is, how do I get my local webapp onto my Amazon instance? FYI, I'm a sys admin/web dev. noob. Thanks.

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• Linux halts every few seconds

  - by Zeppomedio

  We're having an issue where one our Linux boxes (Ubuntu 10.04 LTS, running on EC2 with a quadruple-large size, 68GB of RAM and 8 virtual cores with 3.25GHz each) freezes up every few seconds. Typing in an ssh session will freeze, and running strace on one of the Postgresql processes that's running usually shows: 02:37:41.567990 semop(7831581, {{3, -1, 0}}, 1 for a few seconds before it proceeds (it always gets stuck at that semop). OProfile shows that most of the time is spent in the kernel (60%) versus 37% in Postgresql. The result of these halts (which began suddenly a day ago) is that load on the box has gone from 0.7 to 10+, and causes our entire stack to slow done. Any ideas on how to track down what's going on? iostat doesn't show the disks being particularly slow or overloaded, and top shows user cpu % spike from 8% to about 40% whenever these back-ups happen.

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• jetty crash trouble shooting

  - by user886356

  Recently I switch to amazon ec2 + jetty9 + oracle jdk7_u45 for cost saving. I found the jetty server is very unstable. It crash randomly without any jvm dump file. Tried to enable stdout with the dumpBeforeStop=TRUE. It won't append the dump messages to stderrout.log before crash. Seems it isn't related to OutOfMemoryError as I have enabled the gc verbose options and found it still has many available memory before crash. : 162604K-3340K(176960K), 0.2240040 secs] 248332K-89101K(373568K), 0.2736860 secs] [Times: user=0.01 sys=0.01, real=0.28 secs] Tried to downgrade to jetty8 with different jdk combination (jdk6 / jdk7). Still got the same problem. Tried to remove all jvm options and using "sudo java -jar start.jar" to run jetty. Still crash. Any other way to shoot the problem?

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