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• Will a database server perform better running on 2 CPUs with 16 cores or 4 CPUs with 8 cores?

  - by AlexOdin

  What I have: an online financial application (ASP.NET, C#) at peak we have 5K+ simultaneous users backend is running on Oracle 11g (active server + stand-by using Active Data Guard). At peak - 4K-5K database sessions Oracle is installed on Linux 5.8 (Oracle's unbreakable version) the database size: 7TB disk storage: NetApp (connected with 10GB network) I would like to replace old servers (IT will purchase HP blades BL685C). Servers will have 256GB of RAM. I need your help to figure out what to do with CPUs and cores. Options: 2 CPUs (2.3 GHz) with 16 cores each 4 CPUs (3.0 GHz) with 8 cores each Question: Which one should I pick? P.S. Next year, we will migrate from Oracle to SQL server. I hope, whatever option you recommend will work for both platforms

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• What is Causing this IIS 7 Web Service Sporadic Connectivity Error?

  - by dpalau

  On sporadic occasions we receive the following error when attempting to call an .asmx web service from a .Net client application: "The underlying connection was closed: A connection that was expected to be kept alive was closed by the server. Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." By sporadic I mean that it might occur zero, once every few days, or a half-dozen times a day for some users. It will never occur for the first web service call of a user. And the subsequent (usually the same) call will always work immediately after the failure. The failures happen across a variety of methods in the service and usually happens between 15-20 seconds (according to the log) from the time of the request. Looking in the IIS site log for the particular call will show one or the other of the following windows error codes: 121: The semaphore timeout period has elapsed. 1236: The network connection was aborted by the local system. Some additional environment details: Running on internal network web farm consisting of two servers running IIS7 on Windows Server 2008 OS. These problems did not occur when running in an older IIS6 web farm of three servers running on Windows Server 2003 (and we use a single IIS6/2003 instance for our development and staging environments with no issues). EDIT: Also, all of these server instances are VMWare virtual machines, not sure if that is a surprise anymore or not. The web service is a .Net 2.0/3.5 compiled .asmx web service that has its own application pool (.Net 2.0, integrated pipeline). Only has Windows Authentication enabled. We have another web service on the farm that uses the same physical path as the primary service, the only difference being that Basic Authentication is enabled. This is used for a portion of our ERP system. Have tried using the same and different application pool - no effect on the error. This site isn't hit as often as the primary site and has never had an error. As mentioned, the error will only happen when called from the .Net client - not from other applications. The client application is always creating a new web service object for each request and setting the service credentials to System.Net.CredentialCache.DefaultCredentials. The application is either deployed locally to a client or run in a Citrix server session. Those users running in Citrix doesn't seem to experience the issue, only locally deployed clients. The Citrix servers and the web farm are located in the same physical location and are located in the same IP range (10.67.xx.xx). Locally deployed clients experiencing the error are located elsewhere (10.105.xx.xx, 10.31.xx.xx). I've checked the OS logs to see if I can see any problems but nothing really sticks out. EDIT: Actually, I myself just ran into the error a little bit ago. I decided to check out the logs again and saw that there was a Security log entry of "Audit Failure" at the 'same' time (IIS log entry at 1:39:59, event log entry at 1:39:50). Not sure if this is a coincidence or not, I'll have to check out the logs of previous errors. I'm probably grasping for straws but the details: Log Name: Security Source: Microsoft-Windows-Security-Auditing Date: 7/8/2009 1:39:50 PM Event ID: 5159 Task Category: Filtering Platform Connection Level: Information Keywords: Audit Failure User: N/A Computer: is071019.<**.net Description: The Windows Filtering Platform has blocked a bind to a local port. Application Information: Process ID: 1260 Application Name: \device\harddiskvolume1\windows\system32\svchost.exe Network Information: Source Address: 0.0.0.0 Source Port: 54802 Protocol: 17 Filter Information: Filter Run-Time ID: 0 Layer Name: Resource Assignment Layer Run-Time ID: 36 I've also tried to use Failed Request Tracing in IIS7 but the service call never actually gets to where FRT can capture it (even though the failure is logged in the web service log). The network infrastructure group said they checked out the DNS and any NIC settings are correct so there is no 'flapping'. Everything pans out. I'm not sure that they checked out any domain controller servers though to see if that could be an issue. Any ideas? Or any other debugging strategies to get to the bottom of this? I'm just the developer in charge of the software and don't really have the knowledge on what to investigate from the networking side of things - although it does sound like a networking issue to me based on what is happening. Thanks in advance for any help.

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• How to protect ejabberd from bruteforce attacks?

  - by Sergey

  It writes this in logs: =INFO REPORT==== 2012-03-14 17:48:54 === I(<0.467.0>:ejabberd_listener:281) : (#Port<0.4384>) Accepted connection {{10,254,239,2},51986} -> {{10,254,239,1},5222} =INFO REPORT==== 2012-03-14 17:48:54 === I(<0.1308.0>:ejabberd_c2s:784) : ({socket_state,tls,{tlssock,#Port<0.4384>,#Port<0.4386>},<0.1307.0>}) Failed authentication for USERNAME =INFO REPORT==== 2012-03-14 17:48:54 === I(<0.1308.0>:ejabberd_c2s:649) : ({socket_state,tls,{tlssock,#Port<0.4384>,#Port<0.4386>},<0.1307.0>}) Failed authentication for USERNAME It doesn't write IP with a failure. And strings "Accepted connection" and "Failed auth.." may even not stand nearby (as I think on heavily loaded servers) to be able to use fail2ban. What to do? And how jabber servers (using ejabberd) are protected?

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• Connecting Small business network to Azure Site to Site VPN

  - by MarkKGreenway

  Would like to have connectivity between azure virtual machines and on LAN users. My current network has a Cisco ISA550 connected to the WAN (one Ethernet cable into the office the fiber transceiver is on a different floor)and any public servers can be one-to one NAT-ed to have a public and private IP. What is the best way to get a reliable connection. Between end users and the cloud? I want to know the preferred on site endpoint. Do the azure vm's have to have a local ip in the LAN subnet? (Right now 10.10.0.0/20 or 255.255.240.0 to give room if this is the case). If in purchased an asa550 would I put it behind or in front of the isa550. Would it be ahead or peer with the users switches? What is the best way to get a reliable connection. Between end users and the cloud servers?

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• Need help setting up mail DNS records

  - by Dave

  Hi, We are hosting our web site on host monster, but want our email to continue to be hosted at the old site. Our domain points to the hostmonster DNS servers, but I can't figure out the right configuration for the remote email servers. We have one MX entry, which is priority: 0 domain: ourdomain.com And then we have these DNS entries ... name: mail.ourdomain.com ttl: 14400 class: IN type: A record: old.host.ip.address name: mail1.ourdomain.com ttl: 14400 class: IN type: A record: old.host.secondip.address Can someone tell me what I need to add/edit to get mail to correctly route to our old host? Thanks, - Dave

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• the right way to do deployment with capistrano

  - by com

  I look for good practices for deploying with capistrano. I would like to start out with a short description how I used to do deployment. capistrano is installed locally on a developer's computer. I deploy thought gateway with capistrano option :gateway. Firstly, I thought that with :gateway option I need to have ssh connection only to gateway host, but it turns out that I need ssh connection (public key) to all hosts where I want to deploy to. I would like to find a convenient and secure way to deploy application. For example, in case when new developer starts working, is much more convinient to put his *public_key* only on gateway server and not on all applications servers. On the other hand I don't want him to have any connection to servers in particular ssh to gateway, just because he is developer, he needs to do only deployments. If you are aware of good practices for deploying with capistrano, please, let us know.

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• Multiple VLAN on one switch port

  - by Macropus

  I have a HP ProCurve 1810G-8 which I currently use as a normal switch between 3 servers and a firewall. 2 of the servers are ESXi hosts, and one is a Nexentastor box with 2 iSCSI target LUNs. As the iSCSI traffic is on the same LAN as all other traffic, I would like to switch this to use a SAN for iSCSI traffic and the LAN for all other traffic. The Nexentastor box only has 2 NICs, and as such, with a physical arrangement, I presume that one must be plugged into the SAN VLAN and one on the LAN VLAN ports of the switch. Is there a way to have multiple VLANs over the same port? e.g. the Nexentsator box has 2 NICs, both plugged into the switch, both ports with access to both of the VLANs?

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• Certain clients (IP range) can not ping server

  - by Logman

  I just virtualized a Windows 2003 Server SP2 x32. The server contained our help desk server (Spiceworks) and our anti virus management server (ESET RAC). The host computer actually contained the virtualized server originally; I created the vhd and then I wiped this system clean and installed Windows 2008 R2 x64 Datacenter and added the virtualized 2003 onto the Hyper-V 2008 R2 Server. I got the server running fine except for... certain ip ranges. Local clients can get updates from the AV server from my 192.168.180.xxx & 192.168.181.xxx BUT NOT from any 192.168.182.xxx, 192.168.183.xxx, 192.168.184.xxx etc... I can not ping the server from any clients except for the 180. & 181. ranges. Now I created 2 other virtualized servers (win2008 & a win7 pro) and they exist on the same virtual host as the 2003 server. And at first I could not ping those until I went to the "\Network and Sharing Center\Advanced sharing settings" and Turned On File and Print Sharing. Then I could ping and access those virtualized guests. Win2003 server isn't quite the same. But I am sure I have it on. But now when I ping from a client on one of those ranges that would not work I get this: As you can see the ping leaves our network. We have 2 ad/dns servers (one 180. & the other in the 181. range). Is it DNS? Both AD/DNS servers are Windows 2003. And we plan on upgrading both to 2008 R2 within a month or two but I need to fix this issue pronto (esp the AV end). btw, I did rename that 2003 Server (Spiceworks/AV) hostname. And I tried a CNAME. But I do not think that is the problem. EDIT: OR because this server existed on this hardware/computer before becoming virtualized?

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• Software RAID 10 on Linux

  - by vpetersson

  For a long time, I've been thinking about switching to RAID 10 on a few servers. Now that Ubuntu 10.04 LTS is live, it's time for an upgrade. The servers I'm using are HP Proliant ML115 (very good value). It has four internal 3.5" slots. I'm currently using one drive for the system and a RAID5 array (software) for the remaining three disks. The problem is that this creates a single-point-of-failure on the boot drive. Hence I'd like to switch to a RAID10 array, as it would give me both better I/O performance and more reliability. The problem is only that good controller cards that supports RAID10 (such as 3Ware) cost almost as much as the server itself. Moreover software-RAID10 does not seem to work very well with Grub. What is your advice? Should I just keep running RAID5? Have anyone been able to successfully install a software RAID10 without boot issues?

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• MySQL replication/connection failing over SSL

  - by Marcel Tjandraatmadja

  I set up two MySQL servers where one is replicating from the other. They both work perfectly, but once I turn on SSL I get the following error: ERROR 2026 (HY000): SSL connection error I get the same error running from command line like so: mysql --ssl=1 --ssl-ca=/etc/mysql/certificates/ca-cert.pem --ssl-cert=/etc/mysql/certificates/client-cert.pem --ssl-key=/etc/mysql/certificates/client-key.pem --user=slave --password=slavepassword --host=master.url.com Both MySQL servers are running on version 5.0.77. There is a difference that MySQL in the master server was compiled under x86_64 while in the slave server under i686. Also both machines are running CentOS 5. Plus I generated certificates as per this page. Any idea for finding a solution?

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• Entering IT field with only hobby experience?

  - by EA Bisson

  I can build computers, install servers, network mac, linux, and windows, build servers, do support etc. I do all of this at home/for friends/for hobbies. I have worked with computers every day since I was in elementary school (commodore 64, windows 3.1 etc.). I have IT bachelors in administrative management (so basically nothing good). I am getting another bachelor's in server admin, including about 5 certifications. I am the IT go to gal at every position usually because I know more than the IT people and have better people skills. My job history is random: office admin, hair braider, disney ride operator, camp counselor etc. I found a job I want its a entry level specialist (server) position. What do I put on a resume?

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• Per-machine decentralised DNS caching - nscd/lwresd/etc

  - by Dan Carley

  Preface: We have caching resolvers at each of our geographic network locations. These are clustered for resiliency and their locality reduces the latency of internal requests generated by our servers. This works well. Except that a vast quantity of the requests seen over the wire are lookups for the same records, generated by applications which don't perform any DNS caching of their own. Questions: Is there a significant benefit to running lightweight caching daemons on the individual servers in order to reduce repeated requests from hitting the network? Does anyone have experience of using [u]nscd, lwresd or dnscache to do such a thing? Are there any other packages worth looking at? Any caveats to beware of? Besides the obvious, caching and negative caching stale results.

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• Preventing brute force attacks

  - by nitins

  What are the best tools to prevent Brute force attacks on Linux servers ?

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• Remote desktop sessions - Unwanted automatic log off after period of time

  - by alex

  I'm having an issue whenever I connect to any of our servers via RDP - After a certain period of time, it seems to close these sessions, closing all the applications i had open etc... This is particularly annoying if I am running a long process - for example, copying a file - it cuts it off... I then re-connect via RDP, and it effectively loads a new session. Is this set somewhere in Group Policy? Or somewhere else? This is happening on Windows 2008 (it may also be on our 2003 servers, although I haven't noticed...)

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• china and gmail attacks

  - by doug

  "We have evidence to suggest that a primary goal of the attackers was accessing the Gmail accounts of Chinese human rights activists. Based on our investigation to date we believe their attack did not achieve that objective. Only two Gmail accounts appear to have been accessed, and that activity was limited to account information (such as the date the account was created) and subject line, rather than the content of emails themselves.” [source] I don't know much about how internet works, but as long the chines gov has access to the chines internet providers servers, why do they need to hack gmail accounts? I assume that i don't understand how submitting/writing a message(from user to gmail servers) works, in order to be sent later to the other email address. Who can tell me how submitting a message to a web form works?

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• Database server: Small quick RAM or large slow RAM?

  - by Josh Smeaton

  We are currently designing our new database servers, and have come up with a trade off I'm not entirely sure of how to answer. These are our options: 48GB 1333MHz, or 96GB 1066MHz. My thinking is that RAM should be plentiful for a Database Server (we have plenty and plenty of data, and some very large queries) rather than as quick as it could be. Apparently we can't get 16GB chips at 1333MHz, hence the choices above. So, should we get lots of slower RAM, or less faster RAM? Extra Info: Number of DIMM Slots Available: 6 Servers: Dell Blades CPU: 6 core (only single socket due to Oracle licensing).

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• Moving SharePoint 2010 to a new domain

  - by Chris

  I have a small SharePoint 2010 farm (1 WFE / App Server & 1 SQL server) Our organisation is currently mirgrating to our holding company's global domain, so we now have a new local DC on site with trusts between the current domain and the new domain. I am going to need to move our SP Farm to the new domain and possibly rename servers to fit into the global naming convention (we are trying to avoid this at the moment, but might become a requirement) If there a way to script (stsadm / powershell) the user profiles and permission accross to the new domain? and on the server side, is it as simple as joining the servers to the new domain and updating all the service / farm accounts to accounts on new domain? I have googled this a bit, but everything I have found so far refers to MOSS 2007 or earlier. Any help / advise would be appreciated.

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• Unix Server Partitioning & Filesystem Layout

  - by user1717735

  There's a lot of contradictory information about Unix server partitioning out on the internet, so I need some advice on how to proceed. So far, on the servers I in our test environment I didn't really care about partitioning and I configured a single monolithic / plus a swap partition. This partitioning scheme doesn't seem like a good idea for our production servers. I have found a good starting point here, but it seems very vague on the details. Basically I have a server on which I will be running a basic LAMP stack (Apache, PHP, and MySQL). It will have to handle file uploads (up to 2GB). The system has a 2TB RAID 1 array. I plan to set : / 100GB /var 1000GB (apache files and mysql files will be here), /tmp 800GB (handles the php tmp file) /home 96GB swap 4GB Does this sound sane, or am I over-complicating things?

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• Bad certificate error with RabbitMQ using SSL

  - by David Tinker

  I am trying to get RabbitMQ working with SSL on a couple of Gentoo servers. I get the following error in /var/log/rabbitmq/[email protected] when I try to connect to the management console using https: SSL: certify: ssl_connection.erl:1641:Fatal error: bad certificate I followed the instructions here: http://www.rabbitmq.com/ssl.html The annoying thing is that I have 2 cloned servers and it is working on one and not the other. As far as I can tell the machines are configured identically. I wrote a script to generate the certs etc. and have run it on both. I am not using client certificates. Anyone know how I can figure out whats wrong with my certificate(s)? I am using Erlang 15.2, RabbitMQ 2.7.9, OpenSSL 0.9.8k.

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• Why can't I use SSL certs imported via Server Admin in a custom Apache install?

  - by morgant

  I've got a couple of Mac OS X 10.6.8 Server web servers that run a custom AMP255 (Apache 2.x, MySQL 5.x, and PHP 5.x) stack installed using MacPorts. We've got a lot of Mac OS X Server servers and generally install SSL certs via Server Admin and they "just work" in the built-in services, however, these web servers have always had SSL certs installed in a non-standard location and used only for Apache. Long story short, we're trying to standardize this part of our administration and install certs via Server Admin, but have run into the following issue: when the certs are installed via Server Admin and referenced in our Apache conf files, Apache then prompts for a password upon trying to start. It does not seem to be any password we know, certainly not the admin or keychain passwords! We've added the _www user to the certusers (mainly just to ensure they have the proper access to the private key in /etc/certificates/). So, with the custom installed certs we have the following files (basically just pasted in from the company we purchase our certs from): -rw-r--r-- 1 root admin 1395 Apr 10 11:22 *.domain.tld.ca -rw-r--r-- 1 root admin 1656 Apr 10 11:21 *.domain.tld.cert -rw-r--r-- 1 root admin 1680 Apr 10 11:22 *.domain.tld.key And the following in the VirtualHost in /opt/local/apache2/conf/extra/httpd-ssl.conf: SSLCertificateFile /path/to/certs/*.domain.tld.cert SSLCertificateKeyFile /path/to/certs/*.domain.tld.key SSLCACertificateFile /path/to/certs/*.domain.tld.ca This setup functions normally. If we use the certs installed via Server Admin, which both Server Admin & Keychain Assistant show as valid, they're installed in /etc/certificates/ as follows: -rw-r--r-- 1 root wheel 1655 Apr 9 13:44 *.domain.tld.SOMELONGHASH.cert.pem -rw-r--r-- 1 root wheel 4266 Apr 9 13:44 *.domain.tld.SOMELONGHASH.chain.pem -rw-r----- 1 root certusers 3406 Apr 9 13:44 *.domain.tld.SOMELONGHASH.concat.pem -rw-r----- 1 root certusers 1751 Apr 9 13:44 *.domain.tld.SOMELONGHASH.key.pem And if we replace the aforementioned lines in our httpd-ssl.conf with the following: SSLCertificateFile /etc/certificates/*.domain.tld.SOMELONGHASH.cert.pem SSLCertificateKeyFile /etc/certificates/*.domain.tld.SOMELONGHASH.key.pem SSLCertificateChainFile /etc/certificates/*.domain.tld.SOMELONGHASH.chain.pem This prompts for the unknown password. I have also tried httpd-ssl.conf configured as follows: SSLCertificateFile /etc/certificates/*.domain.tld.SOMELONGHASH.cert.pem SSLCertificateKeyFile /etc/certificates/*.domain.tld.SOMELONGHASH.key.pem SSLCertificateChainFile /etc/certificates/*.domain.tld.SOMELONGHASH.concat.pem And as: SSLCertificateFile /etc/certificates/*.domain.tld.SOMELONGHASH.cert.pem SSLCertificateKeyFile /etc/certificates/*.domain.tld.SOMELONGHASH.key.pem SSLCACertificateFile /etc/certificates/*.domain.tld.SOMELONGHASH.chain.pem We've verified that the certificate is configured to allow all applications access it (in Keychain Assistant). A diff of the /etc/certificates/*.domain.tld.SOMELONGHASH.key.pem & *.domain.tld.key files shows the former is encrypted and the latter is not, so we're assuming that Server Admin/Keychain Assistant is encrypting them for some reason. I know I can create an unencrypted key file as follows: sudo openssl rsa -in /etc/certificates/*.domain.tld.SOMELONGHASH.key.pem -out /etc/certificates/*.domain.tld.SOMELONGHASH.key.no_password.pem But, I can't do that without entering the password. I thought maybe I could export an unencrypted copy of the key from Keychain Admin, but I'm not seeing such an option (not to mention that the .pem options are greyed out in all export options). Any assistance would be greatly appreciated.

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• nsclient++ intermittent connection refused on same subnet

  - by jshin47

  I have setup Nagios and nsclient++ on a number of my Windows servers. They are all in the same subnet so no routing or firewall stuff is taking place in between the endpoints, and I have verified that the firewalls on the servers are not causing trouble. The problem is that the scheduled checks sometimes fail with "connection refused" and sometimes work! It is a frustrating problem to resolve because I do not know what to look for. One place I did look is in the nsclient++ logs, where I am seeing this recurring error: ...\trunk\modules\CheckSystem\PDHCollector.cpp:148: Failed to query performance counters: \238... This sounds promising, but I couldn't find much on Google about this error as it pertains to NSClient++

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• Tying down a cloud by virtualizing everything and then locking VMs to real hardware as necessary

  - by tudor

  I'm looking for a cloud software solution that: Can run on both server and desktop machines; Virtualizes hardware and has the option of exposing each real machine to the cloud; Allows a VM to be "locked" to a set of real hardware capabilities and stay there until moved (e.g. a user's "real" desktop); Allows a VM to link to some types of devices elsewhere (e.g. USB/serial via ethernet); and Is geography-aware to control movement of VMs between real networks. I'm aware that this may be the holy grail of virtualization, and I've searched alot. Some solutions appear to meet some criteria but not others. Most cloud implementations appear to ignore real hardware, for example. I realise that this may be solved by using three different implementations in combination: A standard cloud server farm. A bare-metal network backup utility with PXEBoot. VNC and/or VDI. (VNC obviously would require the real hardware to be running.) This combination, however, has some serious drawbacks that I'd like to solve by treating it as one system. My explanation follows... I have a network of real servers and desktops in multiple locations. I've virtualized servers before using Virtualbox and that's worked quite well. I've even connected USB devices to VMs on servers. I would like to virtualize the desktops in all my offices to facilitate movement of desktops, remote access (e.g. VDI) and bare-metal backups. However, I know that there are problems with this. For example, some desktops have specific hardware (e.g. 3D graphics cards, USB devices, etc) that limit their mobility. Geographic constraints also limit movement in that VMs can be moved easily within offices, but transferring between offices is not always preferable. What I would like to find is a system that can virtualize everything from bare-metal easily by maintaining an abstraction layer on each client and server machine that exposes the hardware available and runs as a cloud. Then certain VMs would be "locked" to specific hardware (so that, e.g. the VM runs only on their own desktop.) This would be required for situations where speed is important (e.g. 3D graphics pass-through). In addition, abstracted low-speed devices (e.g. USB) could be piped from real hardware to a VM in the cloud. This is important since if a VM is taken down, another VM can connect to the real hardware for minimum downtime.

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• Configuring HAProxy with memcache with failover

  - by Lawrie Matthews

  I'm configuring a new set of servers for an existing Wordpress site, and it's been requested that memcache be available and made more resilient. The idea proposed is to have HAProxy send requests to one of the two servers; if that memcache instance is inaccessible, then it should switch to the second, but should not switch back to the first if it comes back up unless the second is then unavailable. This doesn't appear to be a particularly common use case and I've not found much along these lines except to possibly set up the first node with an enormous rise value, such as: server server1 10.112.58.16:11211 check inter 5s fall 3 rise 99999999 server server2 10.112.58.19:11211 check backup which falls over as expected when server1 is unavailable. It won't ever fall back to server1, though, even if server2 goes offline. Can this be made to work?

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• vCenter Server: This host currently has no management network redundancy

  - by goober

  Background I'm on a new VMWare install consisting of: 1 vCenter Server (containing inventory service, SSO, vCenter server, and web client server) 2 ESX Servers configured in a HA group Problem When a I view the summary for any one of my servers, I receive a notice: "" This is expected in our scenario and we're okay with it. Attempted Solutions As I understand from this article and this discussion, the proper way to remove the error message is to ignore it via setting the "das.ignoreRedundantNetWarning" propery to "true". I took the following steps: Logged into vCenter Right-clicked on my HA cluster and chose "Edit Settings..." Clicked "vSphere HA" section Clicked "Advanced Options..." Added the "das.ignoreRedundantNetWarning" option with a value of "true". Question How do I get this error to go away, and are there any reasons why adding this option may not have worked? References Network redundancy message when configuring VMware High Availability in vCenter Server [VMWare KnowledgeBase] How remove a notice " has no management network redundant" [VMWare Community]

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• Nginx + Haproxy + Thin + Rails - 503 Service Unavailable -

  - by Luca G. Soave

  I don't know how troubleshoot this. I get "503 Service Unavailable" http error for all "nginx upstreams" proxy passing calls to haproxy fast_thin and slow_thin ( server 127.0.0.1:3100 and server 127.0.0.1:3200 ), which loadbalance on 6 Thin servers ( 127.0.0.1:3000 .. 3005 ). Static files like /blog are currently fine. The falldown is: nginx on port 80 - haproxy on 3100 and 3200 - thin on 3000 .. 3005 and then Rails. Here it is /etc/nginx/nginx.conf : user nginx; worker_processes 2; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; sendfile on; tcp_nopush on; keepalive_timeout 65; tcp_nodelay on; include /etc/nginx/conf.d/*.conf; } then /etc/nginx/conf.d/default.conf upstream fast_thin { server 127.0.0.1:3100; } upstream slow_thin { server 127.0.0.1:3200; } server { listen 80; server_name www.gitwatcher.com; rewrite ^/(.*) http://gitwatcher.com/$1 permanent; } server { listen 80; server_name gitwatcher.com; access_log /var/www/gitwatcher/log/access.log; error_log /var/www/gitwatcher/log/error.log; root /var/www/gitwatcher/public; # index index.html; location /about { proxy_pass http://fast_thin; break; } location /trends { proxy_pass http://slow_thin; break; } location /categories { proxy_pass http://slow_thin; break; } location /signout { proxy_pass http://slow_thin; break; } location /auth/github { proxy_pass http://slow_thin; break; } location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; if (-f $request_filename/index.html) { rewrite (.*) $1/index.html break; } if (-f $request_filename.html) { rewrite (.*) $1.html break; } if (!-f $request_filename) { proxy_pass http://slow_thin; break; } } } then haproxy config file /etc/haproxy/haproxy.cfg : global log 127.0.0.1 local0 log 127.0.0.1 local1 notice #log loghost local0 info maxconn 4096 #chroot /usr/share/haproxy user haproxy group haproxy daemon #debug #quiet nbproc 1 # number of processing cores defaults log global retries 3 maxconn 2000 contimeout 5000 mode http clitimeout 60000 # maximum inactivity time on the client side srvtimeout 30000 # maximum inactivity time on the server side timeout connect 4000 # maximum time to wait for a connection attempt to a server to succeed option httplog option dontlognull option redispatch option httpclose # disable keepalive (HAProxy does not yet support the HTTP keep-alive mode) option abortonclose # enable early dropping of aborted requests from pending queue option httpchk # enable HTTP protocol to check on servers health option forwardfor # enable insert of X-Forwarded-For headers balance roundrobin # each server is used in turns, according to assigned weight stats enable # enable web-stats at /haproxy?stats stats auth haproxy:pr0xystats # force HTTP Auth to view stats stats refresh 5s # refresh rate of stats page listen rails_proxy 127.0.0.1:3100 # - equal weights on all servers # - maxconn will queue requests at HAProxy if limit is reached # - minconn dynamically scales the connection concurrency (bound my maxconn) depending on size of HAProxy queue # - check health every 20000 microseconds server web1 127.0.0.1:3000 weight 1 minconn 3 maxconn 6 check inter 20000 server web1 127.0.0.1:3001 weight 1 minconn 3 maxconn 6 check inter 20000 server web1 127.0.0.1:3002 weight 1 minconn 3 maxconn 6 check inter 20000 listen slow_proxy 127.0.0.1:3200 # cluster for slow requests, lower the queues, check less frequently server slow1 127.0.0.1:3003 weight 1 minconn 1 maxconn 3 check inter 40000 server slow2 127.0.0.1:3004 weight 1 minconn 1 maxconn 3 check inter 40000 server slow3 127.0.0.1:3005 weight 1 minconn 1 maxconn 3 check inter 40000 and the Thin config file /etc/thin/gitwatcher.yml : --- chdir: /var/www/gitwatcher environment: production address: 0.0.0.0 port: 3000 timeout: 30 log: log/thin.log pid: tmp/pids/thin.pid max_conns: 1024 max_persistent_conns: 100 require: [] wait: 30 servers: 6 daemonize: true if I look into open listen ports, I got the following : root@fullness:/var/www/gitwatcher# lsof | grep TCP | egrep "nginx|haproxy|thin" nginx 834 root 8u IPv4 921 0t0 TCP *:http (LISTEN) nginx 835 nginx 8u IPv4 921 0t0 TCP *:http (LISTEN) nginx 837 nginx 8u IPv4 921 0t0 TCP *:http (LISTEN) haproxy 1908 haproxy 4u IPv4 11699 0t0 TCP localhost:3100 (LISTEN) haproxy 1908 haproxy 6u IPv4 11701 0t0 TCP localhost:3200 (LISTEN) root@fullness:/var/www/gitwatcher# iptables -L get me the following : Chain INPUT (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT tcp -- anywhere anywhere tcp dpt:22222 ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT all -- anywhere anywhere DROP all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere Any help ?

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