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• Amazon EC2 Elastic Load Balancing - strategy for zero downtime server restart

  - by Yoga

  I have 5 web servers (Apache/mod_perl) behind Amazon EC2 Elastic Load Balancing, when I deploy codes to the web servers, I am doing this.. For each machine, shutdown the Apache Update the code Start over the server and proceed to the next server I think when my server is shutdown, ELB will not distribute request to my server, but how about the request still serving? I think a better approach is Stop accepting new request from ELB Sleep for sometimes, shutdown web server only if all requests are responded Update the codes Start the server again But how to perform (1) and (2) from my local sever? Do I need to use AWS API? or other easy way to do it? Thanks.

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• Find out what resource is triggering bad password attempt?

  - by Craig Tataryn

  Background: Have a problem at work where I am constantly being locked out of my computer. We are in an environment that has a Domain Controller and we use Active Directory for authentication. By going through my normal workflow while on the phone with Desktop Support we were able to track the bad password attempts that were causing the lockouts to an application: "Eclipse". This is the application I use to do software development. I immediately thought it was a cached password for our SVN server that's the culprit, however the desktop support person couldn't tell me which resource the password attempt was being made against (i.e. which URL for instance). Question: Is there a way that I can monitor bad authentication requests made by an application on my desktop and find out what resource they are attempting it against?

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• Can Squid 2.7 proxy gzipped content

  - by Tom Styles

  We have a forward proxy for our network which is Squid 2.7. This is managed for us by a third party. We noticed recently that http requests going from our network to the web were having the Accept-Encoding header removed. This was resulting in all web traffic across our network (approx 8000+ PCs) being uncompressed even though the browsers and server on each end were capable. We have asked the third party to look into this and they have said it is because Squid 2.7 does not support compression. I understand this to be true but I was under the impression that the compression happened on the webserver rather than the proxy. So... Can Squid 2.7 proxy and/or cache content that is gzipped? If it can, how/why might it be configured such that the Accept-Encoding header is being removed?

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• Using command line to connect to a wireless network with an http login

  - by Shane

  I'm trying to connect to a wifi network where it hijacks all requests and redirects you to a page where you have to agree to a terms of use before it lets you connect to the actual outside world. This is a pretty common practice, and usually doesn't pose much of a problem. However, I've got a computer running Ubuntu 9.10 server with no windowing system. How can I use the command line to agree to the terms of use? I don't have internet access on the computer to download packages via apt-get or anything like that. Sure, I can think of any number of workarounds, but I suspect there's an easy way to use wget or curl or something. Basically, I need a command line solution for sending an HTTP POST request essentially clicking on a button. For future reference, it'd be helpful to know how to send a POST request with, say, a username and password if I ever find myself in that situation in another hotel or airport.

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• Dhcp clients fail after successful import of server to new machine (win2k3)

  - by Tathagata

  I transfered the configs of a dhcp server from one server to another both running Windows Server 2003 R2 following http [://] support.microsoft.com/kb/325473. The new server has a statically configured ip(outside the scope) like the old one. Stopped the server on the old, and started up in the new server (authorized too) - but when I ipconfig /renew from a client its network interface fails with all 0.0.0.0 (or 169...*). I read somewhere I need to reconcile the scope to sync the new registry values ('ll try this tomorrow). What other troubleshooting steps can I take other than these (which didn't help)? Things work fine when the old server resurrects and the new one is taken down. The new server showed there was no requests for offer.

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• Make a socket as an user but make it readable and writable by another

  - by user1598585

  I have a software that is run under user A, this software creates a socket in /sockets and the socket should be readable and writable by user B. I have tried setting the directory to have ownership A:A or A:B but when user A creates the socket, it ends up with uid A and gid A. Using ACLs has not helped so far, the default mask is preventing the rights to be effective. rw permisions for B will always turn into jusr r. If what I make is not a socket it will work fine. How can I best accomplish this task? (It is for a web-server where the web-application makes the socket and the web-server software forwards requests to it)

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• Wireshark Not Displaying Packets From Other Network Devices, Even in Promisc Mode

  - by eb80

  System Setup: 1. MacBook running Mountain Lion. 2. Wireshark installed and capturing packets (I have "capture all in promiscuous mode" checked) 3. I filter out all packets with my source and destination IP using the following filter ("ip.dst != 192.168.1.104 && ip.src != 192.168.1.104") 4. On the same network as the MacBook, I use an Android device (connecting via WiFi) to make HTTP requests. Expected Results: 1. Wireshark running on the MacBook sees the HTTP request from the Android device. Actual Results: 1. I only see SSDP broadcasts from 192.168.1.1 Question: What do I need to do so that Wireshark, like Firesheep, can see and use the packets (particularly HTTP) from other network devices on the same network?

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• Unable to get to remote samba share

  - by tubaguy50035

  I have a remote VPS that I would like to setup samba on and only allow my IP access to it. I currently have in my smb.conf: [global] netbios name = apollo security = user encrypt passwords = true socket options = TCP_NODELAY printing = bsd log level = 3 log file = /var/log/samba/log/%m debug timestamp = yes max log size = 100 [hosting] path = /hosting/ comment = Hosting Folder browseable = yes read only = yes guest account = yes valid users = nick I have the ports (137,138,139,445) open in iptables (they're open to everyone right now while I debug) and I see nothing in the syslog about iptables blocking my requests. When I try to open a file browser to my address \\ipaddress, it hangs for a good thirty seconds, and then opens a log in box. I enter my user name and password for the server, hit okay. It then opens the same box, I enter my credentials again and hit enter. Windows then tells me it could not connect. My user account is added to Samba already. Anybody have any suggestions what I can do to get this working?

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• Pages partially load on rapid refresh

  - by user101570

  I recently set up a VPS slice with 256MB to run a LAMP stack (Ubuntu 11.04, Apache2, Mysql, PHP5). So far I'm only running a simple Wordpress site on an IP-based virtual host I set up. The performance is excellent, but I've noticed that if I send multiple HTTP requests from the same IP in a short time period, only partial pages are rendered. Then if I wait a bit and refresh the page, the entire page loads again. I noticed this behaviour when accessing the site from two browsers from my office desktop, but it also presents itself if I quickly navigate the site from a single browser (any browser). I'm guessing this is an Apache phenomenon, as the pages are rendered correctly except under the conditions above, but perhaps I'm wrong here. Could it be my hosting company with some kind of DOS protection in place? As a relative Linux/server noob, I'd really appreciate any insight into what settings in Apache could explain this behaviour, and how I might go about changing it.

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• Citrix Mixed Server Session problems

  - by oldskool

  Hello, we've run an Citrix Farm with 4 x Windows 2008 x64 (XenApp 5.0 FP3) and one server Win 2003 x86 (Xenapp 4.6). Yesterday we had a strange problem with Session logins. Existing Sessions could work without problems but new logins were not possible. In the AMC we could not see the Sessions on the Servers. After an reboot all worked fine again. We run the 32 Bit Server since 3 days in our farm (for one Application). Could it be possible that this behavior is caused of the mixed farm? -- (we got in this time a lot of wmi warnings that the Provider CitrixEvemtProv has been registered but it does not correctly impersonate user requests.

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• Enable POST on IIS 7

  - by user26712

  Hello, I have a WCF service that requires POST verb. This service is hosted in a ASP.NET application on IIS 7. I have successfully confirmed that GET works, but POST does not. I have the following two operations, GET works, POST does not. [OperationContract] [WebInvoke(UriTemplate = "/TestPost", BodyStyle = WebMessageBodyStyle.Bare, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)] public string TestPost() { return "great"; } [OperationContract] [WebGet(UriTemplate = "/TestGet", BodyStyle = WebMessageBodyStyle.Bare, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)] public string TestGet() { return "great"; } When I try to access TestPost, I receive a message that says: "Method not allowed". Can someone help me configure IIS 7 to allow POST requests? Thank you!

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• How can I tell if my ISP is redirecting my DNS queries?

  - by Nack

  I've attempted to use some DNS services like OpenDNS, and no matter what I do the DNS queries don't return the expected results. Watching the packet traffic on my firewall, I can see the queries go out to the intended DNS server address and responses coming back, but the results are not as expected, for example, the OpenDNS test page always fails even though the requests appear to be going to their servers. I suspect my ISP is intercepting DNS queries and sending them to their own servers. Is there a way to verify this? Is there something else I might be missing? I'm using 3G wireless service from Sprint.

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• design question for transportation agency/workflow system

  - by George2

  I am designing a transportation agency/workflow system, and it including 3 types of people, customer who requests to transport some stuff, drivers who deliver the stuff, and truck manager who manages transport source/destination truck coordination and communicates/organizes drivers. The system is expected to be a web site, and 3 kinds of people could use the web site to submit request, accept request, monitor status of specific stuff transportation, etc. The web site is more like an open agency or a workflow system. I am wondering whether there are any existing technologies, tools or projects (better to be open source, but not a must) which I could build my application faster based on? I prefer to use .Net technologies, but not a must. Thanks in advance!

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• How to find malicious IPs?

  - by alfish

  Cacti shows irregular and pretty steady high bandwidth to my server (40x the normal) so I guess the server is udnder some sort of DDoS attack. The incoming bandwidth has not paralyzed my server, but of course consuming the bandwidth and affects performance so I am keen to figure out the possible culprits IPs add them to my deny list or otherwise counter them. When I run: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n I get a long list of IPs with up to 400 connections each. I checked the most numerous occurring IPs but they come from my CDN. So I am wondering what is the best way to help monitor the requests that each IP make in order to pinpoint the malicious ones. I am using Ubuntu server. Thanks

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• How do I stop ubuntu waiting for me to "Press S to skip of C to continue..." when it fails to mount on startup?

  - by Jon Cage

  I've been having some issues with my RAID setup recently on my headless Ubuntu 10.04 server which means one of my mount requests is failing on bootup. Clearly I need to fix the RAID issue, but this machine is in my loft and having to crawl up there with a keyboard just so I can hit S a few times is extremely irritating. The exact message is as follows: The disk drive for /drv/photos is not ready yet or not present Continue to wait; or Press S to skip mounting or M for manual recovery I'd still like Ubuntu to try and mount it, but is there any way to tell it not to wait for the device?

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• Question regarding IPv6 - Solicited-Node Address with a Link local scope

  - by Pulse

  Situation: A small LAN comprising a Windows 7 Ultimate x54 PC, 2 XP Pro x86 PCs and an Asus router.The Win 7 box has IPv6 enabled. There are no other IPv6 enabled devices on the LAN. In my firewall I see numerous requests originating from the Win 7 PC, which are for the Multicast address ff02::1:ff.... which is a Solicited-Node address query and has a scope of 2 which equates to the local link. As far as I knew local link addresses are filtered by routers, hence local link. Given that situation I'm wondering why I'm seeing these queries being generated to various addresses? Any ideas? Thanks.

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• nginx errors: upstream timed out (110: Connection timed out)

  - by Sparsh Gupta

  Hi, I have a nginx server with 5 backend servers. We serve around 400-500 requests/second. I have started getting a large number of Upstream Timed out errors (110: Connection timed out) Error string in error.log looks like 2011/01/10 21:59:46 [error] 1153#0: *1699246778 upstream timed out (110: Connection timed out) while reading response header from upstream, client: {IP}, server: {domain}, request: "GET {URL} HTTP/1.1", upstream: "http://{backend_server}:80/{url}", host: "{domain}", referrer: "{referrer}" Any suggestions how to debug such errors. I am unable to find a munin plugin to keep a check on number of upstream errors. Sometime the number of errors per day is way too high and somedays its a more decent 3 digit number. A munin graph would probably help us finding out any pattern or correlation with anything else How can we make the number of such error as ZERO

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• Nginx Tornado Combination Causing 502 Bad Gateway Errors

  - by PlaidFan

  We are facing a problem with inconsistent 502 errors and tracking down the reasons has been a very frustrating exercise. We can reproduce the problem by sending several simultaneous requests quickly. The problem is that several is only in the range of 10 to 20 within a 5 seconds (not a typo). So clearly this type of load should be handled easily. We really like the Nginx + Tornado approach but are considering going to a more traditional (e.g. threading) approach because this problem has been very difficult to solve. I was wondering if you a) know how to fix this issue and b) how we can tracked down the culprit(s). The log files simply identify there being a connection refused. We have the same problem as this post: How do I debug a HTTP 502 error? But there is no answer provided on how to solve the problem so I'm hoping you can help because this may be a common issue with this type of setup. Thanks in advance, Paul

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• Tracing what program is making a network connnection? (CentOS)

  - by Airjoe

  I was wondering if it is possible to find out which process is trying to make a specific network connection. On a server I support which hosts websites for about 200 users, the iptables firewall keeps blocking, as it should, a connection to 212.117.169.139 on port 80. Firefox reports this as an attack page (and at the least is obvious spam, if not malicious). It seems something on this server is trying to access this site for some reason, and although it's being blocked successfully, the requests seem to be going through every two to sixty seconds and I'd like to be able to find what process or script is doing this so I can handle it appropriately. Besides doing a grep to try and find if this IP is in some file (which probably won't even work because it may be working by hostname or it may be encoded), is there any way to find out some more information? Thanks!

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• How do I host multiple domains on Ubuntu Server (Hardy Heron)?

  - by markle976

  I am trying to figure out the best way to host multiple domains on my Ubuntu server. I have tried multiple options, but I can't get everything to work the way I want it to. I want to be able to add domains without having to restart Apache each time. I tried using mod_vhost_alias (see below), but that maps www.domain.com and domain.com to different folders. I also need to be able to use mod_rewite to map requests for domain.com/app/* to domain.com/somescript.php current httpd.conf: UseCanonicalName Off VirtualDocumentRoot /var/www/%0 Any thoughts?

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• Unable to do Port Forwarding in Virtual Box

  - by dewbot

  I'm using Mac OS X 10.6. I have installed Virtual Box 4.1.0 in it. My Guest OS is Ubuntu Server 11.04. I have added a rule in Port Forwarding in Virtual Box - "guestssh" TCP 127.0.1.1 8080 127.0.0.1 1337 Inside Guest OS I'm running nodejs server. Code is nothing but simple helloworld code found on their site http://nodejs.org/. In short I'm running server on 127.0.0.1 on 1337 Port. Now according to rule I have given, from Host Machine all the requests for 127.0.1.1:8080 should be forwarded to 127.0.0.1:1337 of Guest OS. From Host I'm doing curl http://127.0.1.1:8080 and I'm getting curl: (7) couldn't connect to host Is there something am I doing wrong? Note- Don't give me suggestion to do ssh n all. As my ISP does not provide Internal LAN so its not possible in my case. All I can do it Port Forwarding.

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• Distributed website server redundancy

  - by Keith Lion

  Assume a website infrastructure is very complicated and is fully distributed (probably like most large web companies). Am I right in thinking that although there are all these extra web servers to handle multiple client requests, there is still a single "machine" whereby users must enter? I am guessing this machine will be the one physically associated to the IP address? I ask because I need to know whether, in places where distributed systems exist, there is still a single point of failure- usually the control node or, in this example, the machine connected to the public internet? Surely there cannot be two machines connected to the internet, as they would have to have different IP addresses? This "machine" may not be a server per se, but maybe it is a piece of cisco equipment. I just need to know whether, in the real world, these distributed systems still have a particular section where they depend on the integrity of one electronic device?

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• Wordpress serving PHP but not CSS or JS

  - by Jason

  I'm trying to set up an Amazon EC2 instance to run a Django app and a WP instance side by side, differing only by the incoming URL. Initially, accessing the site via mysite.com/wordpress worked, but I also needed to catch the incoming requests from a subdomain address blog.mysite.com. To do that, I created a default file in /etc/apache2/sites-enabled and included two virtualhost directives, one of which was <VirtualHost *:80> ServerName www.blog.mysite.com <Directory /var/www/wordpress> Order deny,allow Allow from all </Directory> </VirtualHost> This created some errors with the other virtualhost, so I restored the default 000-default file configuration and restarted. Now, accessing mysite.com/wordpress takes forever, and even then the CSS and JS files are not loading. Iside the Firebug Net tab, I can see the HTML response, but the CSS and JS files are not loading at all. What happened here?

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• moving my site, IP change worries...

  - by Sherif Buzz

  Hi all, my site has outgrown the shared hosting account it's on and i've setup a VPS that i'll be moving to soon. I cannot keep the same IP between my new account and the old one and I'm a bit at loss as to how to minimize user downtime while the new IP is reflected in all DNS caches. Note I cannot have the site running on both accounts at the same time as it's a dating site and this would cause data inconsistency. Here's what i am planning to do : Put up a 'under maintenance' page on old host Get the site up and running on new host, and update domain to point to new host. Hope downtime isn't too long. Would it be a good idea to have a link on the page in (1) that opens the new site but using it's ip ? Or even redirect all requests at the old host, to the new one (again by ip) ? Any advice much appreciated.

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• options for deploying application

  - by terence

  I've created a simple web application, a self-contained tool with a user system. I host it publicly for everyone to use, but I've gotten some requests to allow companies to host the entire application privately on their internal systems. I have no idea what I'm doing - I have no experience with deployment or server stuff. I'm just some person who learned enough JS and PHP to make a tool for my own needs. The application runs with Apache, MySQL, and PHP. What's the best way to package my application to let others run it privately? I'm assuming there's better options than just sending them all the source code. I'd like to find a solution that is: Does not require support to set up (I'm just a single developer without much free time) Easy to configure Easy to update Does there exist some one-size-fits all thing that I can give to someone, they can install it, and bam, now when they go to http://myapplication/ on their intranet, it works? Thanks for your help.

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