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• How should I host a site that could potentially get a short spike in traffic of 1000%+

  - by James Simpson

  This is a purely theoretical question, but what if I had a site that would normally only get a couple thousand hits a day, but for a few days each month that could shoot to several hundred thousand or even several million hits over the period of 1-3 days. The site would be pretty bare-bones (as in, 2-3 total pages with 1-2 max MySQL queries on each page and some PHP), so bandwidth wouldn't be the issue, but sheer volume taking down the site would be the main concern. Cloud hosting seems like the best way to go, but would something like Amazon EC2, MediaTemple, or something else be the right choice in this case?

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• Postgresql 9.2 where is the initdb located on Ubuntu

  - by thanikkal

  I am trying to install postgres on EC2 / EBS. I am following this article and stuck at the following step. sudo su - su postgres - /usr/pgsql-9.0/bin/initdb -D /pgdata I cant find the initdb command located at the stated location, matter of fact i cant find the pgsql* directory at all under /usr folder. Was this changed for Postgres 9.2 or is there an alternate command that would help me initdb? edit 1: I know the folder pgsql-9.0 is version specific, so i was expecting to see more like pgsql-9.2 or similar.

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• Auto-Attach EBS-volume to a New Spot Instance?

  - by Jeff

  I am experimenting with EC2 spot instances, and am needing some data to be retained between terminations. Now as I understand it, when the current price goes above my max. bid, it will be automatically terminated. I assume any init scripts I have will be run on shutdown so I can push data off to the EBS before unmounting. My question is, how can I automatically mount the same EBS volume on the new spot instance once the price goes down, since it won't have any of my init scripts that I would've loaded onto the root volume the first time? Do I have to create a custom AMI, or is there some other way to achieve this?

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• Strongswan and OpenVPN together

  - by cmorgia

  I have an host in Amazon EC2 which is configured with an OpenVPN Access Server. The only client to this server is acting as a gateway from a private network. I installed StrongSWAN 5 on the same host to allow windows 7 and iOS clients to connect using IPSEC. Both services works but what I cannot figure out is how to configure StrongSWAN to consider the OpenVPN tunnel endpoint as the only gateway available to clients. Basically I want all the traffic that comes from IPSEC clients to be entirely forwarded to the OpenVPN tunnel. The remote OpenVPN client that is exposing the private network has forwarding enabled and appropriate masquerading configured. The only missing point is to have the OpenVPN tunnel as the gateway for IPsEC clients

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• Amazon mount EBS

  - by William

  I'm trying to mount /vol to a EBS volume on an Amazon EC2 instance. I'm formatting the device to xfs, adding "/dev/sdh /vol xfs noatime 0 0" to my /etc/fstab file, making the /vol dir and mounting it and whenever I try to do anything with that volume (create a file in /vol, cd, ls, anything) or I try to run df the server just freezes. Anyone have any idea what this might be? It's driving me crazy. Edit: It seems to freeze after I mount, has nothing to do with doing any commands to the volume it's self.

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• PHP cannot connect to AWS RDS server

  - by Eugene Lim

  I have a EC2 Instance with apchane, PHP and phpmyadmin. I have connect phpmyadmin to manage the aws RDS server. they are in the same security group. But when i try to use a php script to connect to the AWS rds server, it gave me SQLSTATE[HY000] [2003] Can't connect to MySQL server on (xxx.xxx.xxx.xxx). I did some researched, and most of them says use setsebool -P httpd_can_network_connect=1 reference: http://www.filonov.com/2009/08/07/sqlstatehy000-2003-cant-connect-to-mysql-server-on-xxx-xxx-xxx-xxx-13/ But i have no idea which server to configure? and how to?

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• How do I expose a webapp on :8090, even though firewall allows only :80 and :22

  - by Kaustubh P

  I am a noob in Server related stuff, so bear me. I use amazon webservices (EC2) on which I have a webapp running on jetty, which runs on port 8090. I deploy the webapp through the usual method of java -jar start.jar So then to access the app, I have to add a port in the URL, like this: someIP:8090/app But just typing someIP in the browser takes me to a page that shows It works! This is the default web page for this server. The web server software is running but no content has been added, yet. which I assume is apache. I have apache, tomcat and jetty installed. What can I do so that I dont have to specify the port? Do I have to perform port-forwarding? Thanks a lot.

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• How to persist changes to instances in the cloud.

  - by Peter NUnn

  Hi folks, I must be missing something here, but can someone clue me in on how to persist changes (such as software installs etc) on machines in the cloud (either EC2 or my own Eucalyptus cloud). I have instances running.. can attach extra disks to them etc., but every time I terminate the instance, all of my changes are lost the next time I run them. Now, this sort of makes sense in that the instances are virtual, but, there must be some way to make these changes persist. I'm just missing how its done. Thanks. Peter.

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• Amazon EBS root volume persistence

  - by hipplar

  When I launch a new Windows EC2 instance I am given a 30 gig root EBS volume. I'm trying to make sure I understand the EBS terminology and want to make sure I understand this correctly: Q: What happens to my data when a system terminates? The data stored on a local instance store will persist only as long as that instance is alive. However, data that is stored on an Amazon EBS volume will persist independently of the life of the instance. What exactly does "instance is alive" mean? If I write files to the root volume and reboot the instance will the files remain? Or do I physically have to terminate (delete) the instance for the root volume to go away? Thanks

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• Database modularity with EBS volumes

  - by Eclyps19

  I would like to add modularity to my websites on EC2 instances by encapsulating the site files and the mysql files in their own EBS volumes. The end result that I'm going for is the ability to quickly mount a volume or two to different servers running the same AMI (for testing/development/emergency maintenance, etc), as well as maintain separate snapshots of each. I'm able to do this fairly easily with a single database by symlinking my mounted database EBS to the appropriate places (/var/lib/mysql, /etc/my.cnf, /var/log/mysqld.log), but I'm not sure if it would even be possible be possible to have multiple databases on different EBS volumes running concurrently. Example: /website1/www.website.com /database1/ /website2/www.otherwebsite.com /database2/ Could anybody shed some light on this for me? Is it possible? Is it a bad idea? Thanks.

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• How to configure squid for retrieving (and caching) directly my static resources?

  - by fabien7474

  I have an Apache/Tomcat/Spring tc Server running on CentOS EC2 VM. I would like to install squid on the same machine as a proxy for retrieving (directly i.e. without forwarding the request to Apache/Tomcat) and caching static content ONLY identified by URIs : /images, /css or /js. Other URIs should be forwarded to the normal Web Server and not cached. Since I am a newbie, I didn't find from squid documentation how to configure squid for this desired behavior (and if it is even possible). Could you please help me and tell me how should I configure squid for this purpose? Thank you.

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• EBS+RAID10+XFS slower than EBS+RAID10+EXT3 using MySQL?

  - by Johann Tagle

  We're currently using EC2 with 16 EBS volumes in RAID10 configuration for our MySQL data. I know some people don't recommend to put EBS volumes to RAID but that's not what I'm concerned about at the moment. Current format is ext3, but we're experimenting with moving to xfs, given many reports that it is faster. However, we're actually experiencing a performance degradation when the partition was converted to xfs - a benchmark run with inserts, updates, selects and deletes was more than 10 seconds slower using xfs. Any idea what could be the problem? Below is the fstab entry (really only changed ext3 to xfs). Database tables are innodb and we are using innodb_file_per_table. /dev/mapper/vg_data-lv_data /data xfs noatime 0 0 Thanks.

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• AWS Elastic load balancer doesn't decrease instances from Alarm Trigger

  - by jchysk

  I have a load balancer that I created an auto-scaling-group and launch-config for. I created the auto-scaling-group with a min-size of 1 and max size of 20. I have a scaledown policy: as-put-scaling-policy SBMScaleDownPolicy --auto-scaling-group SBMAutoScaleGroup --adjustment=-1 --type ChangeInCapacity --cooldown 300 Then I set up an alarm: mon-put-metric-alarm SBMLowCPUAlarm --comparison-operator LessThanThreshold --evaluation-periods 1 --metric-name CPUUtilization --namespace "AWS/EC2" --period 600 --statistic Average --threshold 35 --alarm-actions arn:aws:autoscaling:us-east-1:policystuffhere:autoScalingGroupName/SBMAutoScaleGroup:policyName/SBMScaleDownPolicy --dimensions "AutoScalingGroupName=SBMAutoScaleGroup" When average CPU usage over 10 minutes is under 35, in CloudFront the alarm shows up as "In Alarm State" but doesn't decrease the number of instances. Also, if there's only one instance running it'll spin up another to 2 even if a scale up alarm isn't hit. It seems like the default value is just set to 2 somehow. How can I change this?

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• Elastic Load Balancer & SSL termination

  - by Aaron Scruggs

  I am setting up a Rails app on AWS that: 1) all traffic must ssl encrypted 2) will highly fluctuate in traffic on a weekly basis 3) will by maintained by someone that is a stronger coder than sysadmin, but will be responsible for both I am thinking that SSL termination on an elastic load balancer backed by small ec2 instances running nginx and unicorn A small subset of the requests will take longer than 10s, because of this I am also debating using 'thin' instead of 'unicorn'. My question is this: Is this sane? I am stepping into a quagmire of cost, maintainability, security or performance problems?

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• Reverse Proxy Wordpress with Lighttpd

  - by Jonah

  I am deploying an application and a Wordpress installation on AWS. I have Wordpress set up under Apache on an EC2, and my application under Lighttpd, and I want to reverse-proxy Wordpress through the application node. This works fine, I just set up the reverse proxy in Lighttpd as so: $HTTP["url"] =~ "^/blog" { proxy.server = ( "/blog" => ( "blog" => ( "host" => "123.456.789.123", "port" => 80 )) ) } url.rewrite-once = ( "^(.*?)$" => "/index.php/$1" ) However, the issue is in the rewrite. When I enable rewriting, it catches it before the reverse proxy, and routes to index.php on the application server. I need it to not rewrite if it's going to the blog. I tried various regex matches and other configurations, but I haven't been able to get it to support rewriting and proxying at the same time. How can this be done?

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• vpn/Openvpn as a cloud service

  - by 8pipe

  I am working on creating a small cloud (any number of EC2 instances that can be deployed based on load) implementing a VPN as a service for the company I'm working for. This is basically a project gathering together various vpn resources under one aegis as a cloud based service. As a user of openvpn, I'm somewhat familiar with being able to connect, but I'm looking for resources to start this project. Essentially I need to be able to: run a certificate authority and manage keys to distribute to coworkers build an ami that handles openvpn as a service balance the load if necessary among machines instances as needed Any suggestions for tutorials, things to avoid, roadblocks I might not be seeing from a novice perspective, etc. or just help in visualizing this is appreciated.

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• Which AMI should I use as a base for a Django application?

  - by Edan Maor

  I'm starting development of a Django application, on Amazon's Web Services. I'm looking to build an instance that will serve the Django. I don't have much experience with such things, having only used a shared host before (WebFaction). So I'm wondering, which AMI should I use as a base? I'm assuming I want an Ubuntu AMI, possibly with certain things like Apache pre-installed? One minor point: I'm planning to serve several different Django projects from the same instance. I use virtualenv on my dev machine right now to separate the different projects, I'm assuming I'll do the same on EC2. Thanks!

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• OSSEC is not running

  - by batman

  I have an two ec2 instances. In one I have installed ossec server and in other I have installed ossec agent. Here are my server config INBOUND (security group/firewall) : port:514 source:0.0.0.0/0 port:1514 source:0.0.0.0/0 But it seems to be not working. In my agent log file I keep on getting: 2012/08/28 06:52:52 ossec-agentd: INFO: Using IPv4 for: x.x.x.x.x.x . 2012/08/28 06:53:13 ossec-agentd(4101): WARN: Waiting for server reply (not started). Tried: 'x.x.x.x.x'. Edit: Running sudo netstat --inet -nlp | grep ossec. I'm getting: udp 0 0 0.0.0.0:1514 0.0.0.0:* 26027/ossec-remoted Where I'm making the mistake?

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• Disable disk caches in AWS EBS for PostgreSQL?

  - by Alexandr Kurilin

  It's my understanding that, without correctly disabling OS-level and drive-level caching, there is a chance that in case of system failure the Write-Ahead Log might not be saved correctly and in fact might get corrupted, possibly preventing data recovery. I've already made sure that wal_sync_method=fdatasync however I was unable to make any configuration changes with hdparm since I get the following: $ sudo htparm -I /dev/xvdf /dev/xvdf: HDIO_DRIVE_CMD(identify) failed: Invalid argument Looks like that option is not available in the kind of setup you get in EC2. Am I missing anything here? Are there any other obvious caches I have to disable to ensure the WAL's safety?

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• Mounting both /dev/sda and /dev/sda1 - how can this be?

  - by itsadok

  I work on an Amazon EC2 instance that somebody else set up. We have an EBS volume mounted on /dev/sda, even though the root device is already on /dev/sda1, and we're also using `/dev/sda2' user@server:~$ mount /dev/sda1 on / type ext3 (rw) ... (snip) /dev/sda2 on /mnt type ext3 (rw) /dev/sda on /vol type xfs (rw,noatime) ... This doesn't seem to fit with what I know about the way /dev/ works. How is this possible, and more importantly: will this cause trouble in the future? I'm running ubuntu 9.04 jaunty.

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• DNS settings for SaaS in the cloud?

  - by Jeremy

  I am building a SaaS product. When a user signs up for an account they must select an alias for their site --------.getlaunchpoint.com. Right now I have an A record *.getlaunchpoint.com that points to the ip address server. However, with Azure I am not given an IP address. The suggested implementation is to make use of a CNAME. I need to create a CNAME for *.getlaunchpoint.com - getlaunchpoint.cloudapp.net GoDaddy does not support CNAME wildcards. Searching on Google I'm getting conflicting information... is CNAME wildcard a bad practice? I run into the same problem with Amazon EC2 if I want to make use of load balancers because you cannot tie a public IP address to an Amazon Load Balancer. Amazon also suggests the use of a CNAME. Any help would be appreciated.

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• How to upgrade a single instance's size without downtime

  - by Justin Meltzer

  I'm afraid there may not be a way to do this since we're not load balancing, but I'd like to know if there is any way to upgrade an EC2 EBS backed instance to a larger size without downtime. First of all, we have everything on one instance: both our app and our database (mongodb). This is along the lines i'm thinking: I know you can create snapshots of your EBS and an AMI of your instance. We already have an AMI and we create hourly snapshots. If I spin up a new separate instance of a larger size and then implement (not sure what the right term is here) the snapshots so that our database is up to date, then I could switch the A record of our domain from the old ip address to the new one. However, I'm afraid that after copying over the data from the snapshot, by the time it takes to change the A record and have that change propagate, the data could potentially be stale. Is there a way to prevent this, and is there a better way to do this than I am suggesting?

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• zlib/libxml2 duplicate package?

  - by Fusion

  I've been updating my amazon ec2 micro instance every month till now. when i try to "yum update" i receive this error : zlib-1.2.5-7.11.amzn1.x86_64 has installed conflicts libxml2 < ('0', '2.7.7', None): libxml2-2.7.6-4.12.amzn1.x86_64 zlib-1.2.5-7.11.amzn1.x86_64 is a duplicate with zlib-1.2.3-27.9.amzn1.x86_64 yum update output: http://pastebin.com/Dfq0yphN I've tried to update separately zlib and libxml2 zlib: same "duplicate" error. libxml2: Transaction Check Error: package libxml2-2.7.8-10.24.amzn1.x86_64 is already installed what can i do?

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• Easy way to update apache on a server cluster with shared NFS conf?

  - by Simon

  we have a server setup where a server cluster connected with a db/files/conf server shared by nfs serve our sites, behind an Elastic Load Balancer at Amazon EC2. The setup works correctly, but keeping it up to date is becoming like hell, because the apache/php conf that webservers use is shared through NFS. So, if we try to run an apt-get upgrade on a server on the cluster, it will abort it due to the webserver is not able to write back the configuration to the nfs server. Every time we want to update the machines, or install a package like php-curl, we need to create a new ami, so the changes will reflect on the new launched amis. Could it be another way of doing the things simpler? Thanks in advance!

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• Address already in use - Amazon AWS

  - by Peter

  I've run into a really weird issue. I was debugging a server 500 error script on our EC2 instance and found that we didn't have ioncube loaders installed. So I went to go install them and I created a new file at /etc/php.d/zend.ini and initially I inserted the value of extension=/usr/local/ioncube/ioncube_loader_lin_5.3.so and restarted httpd at which point it told me: The ionCube Loader is a Zend-Engine extension and not a module Please specify the Loader using 'zend_extension' in php.ini PHP Fatal error: Unable to start ionCube Loader module in Unknown on line 0 So I changed the contents of zend.ini to zend_extension=/usr/...etc. Now when I attempt to restart httpd I get this error: Starting httpd: (98)Address already in use: make_sock: could not bind to address [::]:80 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs I can't even run /etc/init.d/httpd stop without it erroring. I've since removed zend.ini to see if that's what caused it and it doesn't seem to be. Any ideas?

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