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• How do I register a service with Bonjour?

  - by Roman

  I am trying to start to use Bonjour. Here I found a manual how to register a service with Bonjour. The following is written there: The network services architecture in Bonjour includes an easy-to-use mechanism for publishing, discovering, and using IP-based services. Well let's see how to register a service. In the very beginning it is written: To publish a service, an application or device must register the service with a Multicast DNS responder But how?!?! First of all I do not know what is the Multicast DNS responder. Second, it is not written how do I do it. Where and what should I type? Should I use command line? Should I use some programming languages? What exactly should I type... Is there an easy way to start to use Bonjour? Well, it was emphasized several times how easy it should be to use it. But I cannot start to use it for several day. So, can anybody, pleas, help me with that?

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• Enabling mod_wsgi in Apache for a Django app on Gentoo

  - by hobbes3

  I installed Apache, Django, and mod_wsgi on Gentoo using emerge (on Amazon EC2). I know that the mod_wsgi is configured in /etc/apache2/modules.d/70_mod_wsgi.conf: <IfDefine WSGI> LoadModule wsgi_module modules/mod_wsgi.so </IfDefine> # vim: ts=4 filetype=apache So in my /etc/conf.d/apache I added the WSGI module: APACHE2_OPTS="-D DEFAULT_VHOST -D INFO -D SSL -D SSL_DEFAULT_VHOST -D LANGUAGE -D WSGI" But when I try to list the loaded module, mod_wsgi isn't listed. root ~ # apache2 -M | grep wsgi Syntax OK I also know that mod_wsgi isn't loading properly because the Apache configuration file doesn't recognize WSGIScriptAlias. By the way for Django to work I need to include a custom Apache configuration file. Where should I insert the line below? Include "/var/www/localhost/htdocs/mysite/apache/apache_django_wsgi.conf" I currently have that in the httpd.conf file but I feel like that file will get reseted whenever I upgrade Gentoo or related package. EDIT: it seems the mod_wsgi file is located in /usr/lib64/apache2/modules/mod_wsgi.so. Here is my detailed Apache settings: root@ip-99-99-99-99 /usr/portage/eclass # apache2 -V Server version: Apache/2.2.21 (Unix) Server built: Mar 7 2012 06:52:30 Server's Module Magic Number: 20051115:30 Server loaded: APR 1.4.5, APR-Util 1.3.12 Compiled using: APR 1.4.5, APR-Util 1.3.12 Architecture: 64-bit Server MPM: Prefork threaded: no forked: yes (variable process count) Server compiled with.... -D APACHE_MPM_DIR="server/mpm/prefork" -D APR_HAS_SENDFILE -D APR_HAS_MMAP -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled) -D APR_USE_SYSVSEM_SERIALIZE -D APR_USE_PTHREAD_SERIALIZE -D APR_HAS_OTHER_CHILD -D AP_HAVE_RELIABLE_PIPED_LOGS -D DYNAMIC_MODULE_LIMIT=128 -D HTTPD_ROOT="/usr" -D SUEXEC_BIN="/usr/sbin/suexec" -D DEFAULT_PIDLOG="/var/run/httpd.pid" -D DEFAULT_SCOREBOARD="logs/apache_runtime_status" -D DEFAULT_LOCKFILE="/var/run/accept.lock" -D DEFAULT_ERRORLOG="logs/error_log" -D AP_TYPES_CONFIG_FILE="/etc/apache2/mime.types" -D SERVER_CONFIG_FILE="/etc/apache2/httpd.conf"

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• Designing a software based load balancer

  - by Kishore pandey

  Hello to all Server fault users, I am new to this website but have constantly been using the mother website, stackover flow. Well to begin with, i would like to design a load balancer for the organization i am working for. As i am very new to this whole, idea about load balancing and networks. I am finding it very difficult to start my project. I did a lot of research on already existing load balancer and found some(HAPROXY,NGINX) that could solve my problems, but the point is, I am still in a dilemma if they could answer the following requirements of mine: The client and server in my architecture are distributed. The load balancer should take care of the firewall. LB server should balance the load among all servers present in WWW cloud. The LB server should have some sort of configuration file, with the help of which it is possible to configure the servers. Heart beat: With the help of which it would be possible to check if any server is down, if any server is down the request should be passed to some other server. Various load balancing algorithms of the incoming requests. Easy error handling. It should be fairly possible to prioritize the incoming requests. Is there any already available load balncer solution on the market that could satisfy these requirements? If not is there any base code available with the help of which i could develop my own load balncer. If not where should i start from scratch? I am practically new to everything. Any help from a load balancer expert is very much appreciated. Thanx a ton in advance. Cheers and regards. Kishore

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• Mysqld increases the load on the CPU and drops after flush-tables

  - by mirage

  Help please advice on the issue. Normal load on the cpu 20-30% us + sy. After restoring the database files from the slave server (same version) began a periodic problem. mysql starts to load the cpu at 100% (us + sy grows proportionally). The queue is growing, everything slows down. But with mysqladmin flush-tables are normalized for a few hours. Dedicated linux server running mysql 2 x E5506 24Gb RAM, database size 50Gb. [OK] Currently running supported MySQL version 5.0.51a-24 + lenny4-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics --------------------------------------- ---- [-] Status: + Archive-BDB-Federated + InnoDB-ISAM-NDBCluster [-] Data in MyISAM tables: 33G (Tables: 1474) [-] Data in InnoDB tables: 1G (Tables: 4) [-] Data in MEMORY tables: 120K (Tables: 3) [-] Reads / Writes: 91% / 9% [-] Total buffers: 12.8M per thread and 7.1G global [OK] Maximum possible memory usage: 15.8G (66% of installed RAM) 4000 - 5500 rps key_buffer = 1536M max_allowed_packet = 2M table_cache = 4096 sort_buffer_size = 409584 read_buffer_size = 128K read_rnd_buffer_size = 8M myisam_sort_buffer_size = 64M thread_cache_size = 500 query_cache_size = 100M thread_concurrency = 24 max_connections = 700 tmp_table_size = 4096M join_buffer_size = 4M max_heap_table_size = 4096M query_cache_limit = 1M low_priority_updates = 1 concurrent_insert = 2 wait_timeout = 30 server-id = 1 log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M innodb_buffer_pool_size = 1536M innodb_log_buffer_size = 4M innodb_flush_log_at_trx_commit = 2 How to solve the problem?

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• Understanding the Mounting of a Filesystem

  - by Tom H.

  I'm new to linux and want to check my understanding of how mounting/filesystems work. I read related manpages, but just want to be sure. I have a partition say /dev/sda5 that is currently mounted to /home with various subdirs. It is my understanding that this means /dev/sda5 has its own portable filesystem that can be moved anywhere in the main filesystem. Questions: If I unmount /dev/sda5 from /home (# umount /home) and then mount it to /var/www/ (which is empty) (# mount -t ext3 /dev/sda5 /var/www) and replace the fstab entry, with /dev/sda5 /var/www ext3 defaults,noatime,nodev 1 2 and # mount -a, Q1) are all of the contents of /home now accessible under /var/www/ (i.e. /home/username -> /var/www/username)? Q2) Are all of the permissions from the /home filesystem kept intact in this new location? Anything else I should be concerned with? Just want to make sure I don't go wipe/corrupt anything. Coming from Windows the filesystem architecture takes getting used to (though I'm loving the flexibility!).

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• My client's solution of a Windows SBS 2011 VM on an Ubuntu host and VirtualBox is pinning the host CPU

  - by Scott Stamp

  Here's my situation, I've got a client hosting two servers (one VM), with the host providing VMware Zimbra, the other Windows Small Business Server 2011. Unfortunately, the person before me had configured this setup as follows. Host: Ubuntu Desktop Edition 10.04 (I know, again, not my choice) running VMware Zimbra 8GB of RAM On-board RAID1 of two 320GB Seagate Barracuda drives for the OS Software RAID5 of four 500GB WD Caviar Black drives on MDADM for bulk storage (sorry, I don't know the model #) A relatively competent quad-core Intel Core i7 CPU from the Nehalem architecture (not suspicious of this as the bottleneck) Guest: Windows Small Business Server 2011 4GB of RAM Host-equivalent CPU allocation VDI file for OS hosted on the on-board RAID, VDI file for storage hosted on the on-board RAID For some reason when running, the VM locks up when sitting nearly idle, and the VirtualBox process reports values of 240%+ in top (how is that even possible?!). Anyone have any ideas or suggestions? I'm totally stumped on this one. Happy to provide whatever logs you'd like to take a look at. Ideally I'd drop VirtualBox and provision this with VMware Workstation, but the client has objected to the (very nominal) costs involved. If hardware needs to be purchased to help, it will be, but we're considering upgrades a last-resort at this time. Thanks in advance! *fingers crossed*

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• Connect to Apache times out randomly

  - by Amadan

  We are trying to set up an Apache server on a remote machine, but we experience strange behaviour. Checking with telnet remote.machine 80, one of these things happen randomly: Connect and serve content normally (no delay) Connect after a long pause Connect normally, then time out without response Timeout on connect Once connected, the request seems to be processed normally. These things do not occur if I connect from that machine directly to localhost 80. The Apache is dedicated, as is the server it runs on (runs only this one application, no-one else is using it for anything else). I am not an administrator of the remote site, and I do not know the network architecture over there, but apparently it's firewalled: (HTTP port is open, SSH port is IP-restricted, most others are closed). If there was any one pattern, I might have some ideas, but this variety of symptoms baffles me. Any ideas as to what could be causing this? Apache is 2.2; Server version is: Linux version 2.6.9-22.ELsmp ([email protected]) (gcc version 3.4.4 20050721 (Red Hat 3.4.4-2)) #1 SMP Mon Sep 19 18:32:14 EDT 2005

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• Can a folder on a NAS be made available as a physical drive in VMWare?

  - by asbjornu

  We are currently in the process of moving from a single web server to two load balanced web servers and are facing some challenges we don't quite know how to fix. One of these is that the current single server hosts applications that write stuff to disk. The applications running on the server expects that when something is written to disk it later will in fact exist, so it's important that this premise is fulfilled with the dual server architecture as well. The dual server setup is a couple of VMWare instances with Windows Server 2008 R2 as the guest operating system. Out of the box, these instances does not share any kind of file system, so just moving the applications over would make them break since one instance would write something to the file system that doesn't exist on the other. Thus we need to share a file system between the two virtual servers. Our host has proposed to create a network share on a SAN and map this share individually on each virtual machine. This doesn't work too well due to NTFS permissions, etc., because the share needs to be accessed by several independent web applications that won't even be in the same application pool. The only solution that kind of works is to hard code an "identity" for each web application into its web.config file, but this means password in clear text which doesn't sit well with me. Since the servers are virtual, I'm thinknig: Wouldn't it be possible to make a NAS area available as a physical disk in the gues operating system somehow? Since VMWare has full control of the virtual hardware, you'd think it would be able to "fake" a local hard drive in the virtual machine that in reality is a folder on a NAS, but so far I haven't found anything that states how and if this is possible. So I have to ask the wonderful Server Fault community: Can a folder on a NAS be made available as a physical drive (typical D:) in both of the virtual machines?

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• How can I batch convert SVG files containing text to PDF files (specifically on CentOS 5.3 x86_64)?

  - by molecules

  I would like to programatically convert SVG files to PDF files. However, the SVG files contain text that must be searchable in the generated PDF files. Also, it has to work on Red Hat Enterprise Linux 5.3 or CentOS 5.3 for the x86_64 architecture. It would be nice if it were Open Source or at least not very expensive. Here is what I've tried. All of these, except Batik, work fine on Debian Lenny. Inkscape I can get it installed using autopackages from http://inkscape.modevia.com/ap, but when I use it from the command line, the text is not searchable. Batik rasterizer [sic] When it converts SVG files to PDF files, the text is no longer searchable. svg2pdf The source for this and several of its dependencies are available to download. I have been trying to get it to compile on CentOS, but haven't had success yet. I found a precompiled version for Debian x86_64, but it doesn't work on CentOS. rsvg-convert Generated PDF isn't searchable on CentOS 5.3. Perhaps installing a newer version of cairo would help. Thanks to DaveParillo for mentioning rsvg-convert (on superuser). SOLUTION (but perhaps some of the above will still be useful to the reader) princeXML It works fine on CentOS when installed from source. For some reason it doesn't work when installed from the .rpm. Thanks Erik Dahlström! (provided solution that worked for my case on stackoverflow) Cross posted on stackoverflow

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• SharePoint, Exchange and Incoming Emails Without Directory Management Services

  - by Nariman

  Trying to keep this as simple as possible. We've already created the email accounts that we need (e.g. account[1-20]@domain.com) on Exchange/AD. We'd like to now enable incoming emails on SharePoint 2007 lists corresponding to these accounts. My thinking is we don’t need to configure Directory Management Services [2] – the architecture will be simpler without it and the application doesn’t require these services. However, we still need to route messages from Exchange to either local SMTP services (via the connector described in the articles below) or by user-specific drop-folder settings (if permitted by Exchange). So the question is: can we instruct Exchange to use a drop folder just for accounts account[1-20]@domain.com? or do we need to change the accounts to account[1-20]@sharepointsmtp.domain.com and re-route those message to the local SMTP service that will drop them on disk? I've read the material below. [1] - http://www.combined-knowledge.com/Downloads/2007/How%20to%20configure%20Email%20Enabled%20Lists%20in%20Moss2007%20RTM%20using%20Exchange%202007.pdf http://social.msdn.microsoft.com/Forums/en/sharepointdevelopment/thread/91e0c3d2-afe6-469d-b1bc-6ae7a9aa287e http://gj80blogtech.blogspot.com/2009/12/configure-incoming-email-setting-in.html http://www.jasonslater.co.uk/2007/08/10/configuring-incoming-mail-on-moss-2007-and-exchange-2007/ http://technet.microsoft.com/en-us/library/cc262947%28office.12%29.aspx http://technet.microsoft.com/en-us/library/cc263260%28office.12%29.aspx [2] – http://graycloud.com/sharepoint/incoming-mail-configuration-what-permissions-are-require-t39483.html

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• VMware NAS/iSCSI recommendations - smallish organization

  - by Bubnoff

  I have two VMware servers - ESX + ESXi. Two backup NAS boxes. The current NAS boxes are low-cost and unsuitable for running VMs from. Support NFS only. Slow. My plan is to have a dedicated iSCSI/NAS for storing and running VMs. Two additional low-cost boxes for backup. I'm looking for advice regarding 2 things really: Recommendations as far as VMware architecture/design for a smaller organization. Less than 20 Virtual Machines. 2 servers + 2 x 1.5 terabyte backup NAS boxes. A good NAS/iSCSI box with your recommendation on RAID config ...I would go with 6 or better. I'm trying to design an installation that is both fast and reliable/redundant. If you have any experiences to share or your current configuration including network design ( switches, fiber ...etc ), I will be enormously thankful. I'm not married to this idea, so if you have a design not using iSCSI NAS boxes ...let er rip. Cost? Can we stay around $5,000 ( on top of already stated components )? Links to info are welcome also. Thanks for reading! Bubnoff

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• Windows 7 on a 64-bit computer

  - by GetFree

  I read on Wikipedia that Windows 7 on a 64-bit PC needs twice as much RAM as on a 32-bit PC. I understand why is that: every number stored in memory takes 8 bytes rather than just 4. That, in simple terms, means that your amount of RAM is reduced to half when you use Windows 7 on a 64-bit computer. Now, I have a Intel Core 2 Duo Laptop with Windows Vista right now (2 GB of RAM). My question is: Since Core 2 is a 64-bit architecture, if I upgrade to Windows 7 will my laptop be working as if it had just 1 GB of RAM? Or... to say it in other words: Having a 64-bit PC with Windows 7 do you need twice as much RAM as you need on a 32-bit PC to have the same performance? If I am right, then I'd say it's a terrible business to have a 64-bit computer and Windows 7 on it (I hope I am mistaken, though). Follow-up: After some answers, I'm realizing it's not the same thing to have a 32-bit OS on a 64-bit PC than a 64-bit OS on a 64-bit PC. Apparently, the problem of Windows 7 requiring twice as much RAM on 64-bit architectures is when you have both the OS and PC supporting 64 bits. I'd like new answers to address this issue. Also, is it possible to have more that 4 GB of RAM on a 64-bit PC using a 32-bit version of Windows?

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• Server Clustering (Django, Apache, Nginx, Postgres)

  - by system-matrix

  I have a project deployed with django, Apache, Nginx and Postgres. The project has requirement of live data viewable to customers. The projects main points are: 1. Devices in field send data to server(devices are also like website users) after login. 2. There is background import process which imports the uploaded data in postgres. 3. The webusers of the system use this data and can send commands to the devices, which devices read when they login. 4. There are also background analysis routines running on the data. All the above mentioned setup and system is deployed on one amazon EC2 cloud machine. The project currently supports over 600 devices and 400 users. But as the number of devices are increasing with time the performance of the server is going down. We want to extend this project so that it can support more and more devices. My initial thinking is, We will create one more server like current one and divide the devices amongst these to servers. But Again We need a central user and device managment point though django admin. Any Ideas? What are the best possible ways to create a scalable architecture? How can I create a Postgres Cluster and Use it with Django, if possible?

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• Standards for documenting/designing infrastructure

  - by Paul

  We have a moderately complex solution for which we need to construct a production environment. There are around a dozen components (and here I'm using a definition of "component" which means "can fail independently of other components" - e.g. an Apache server, a Weblogic web app, an ftp server, an ejabberd server, etc). There are a number of weblogic web apps - and one thing we need to decide is how many weblogic containers to run these web apps in. The system needs to be highly available, and communications in and out of the system are typically secured by SSL Our datacentre team will handle things like VLAN design, racking, server specification and build. So the kinds of decisions we still need to make are: How to map components to physical servers (and weblogic containers) Identify all communication paths, ensure all are either resilient or there's an "upstream" comms path that is resilient, and failover of that depends on all single-points of failure "downstream". Decide where to terminate SSL (on load balancers, or on Apache servers, for instance). My question isn't really about how to make the decisions, but whether there are any standards for documenting (especially in diagrams) the design questions and the design decisions. It seems odd, for instance, that Visio doesn't have a template for something like this - it has templates for more physical layout, and for more logical /software architecture diagrams. So right now I'm using a basic Visio diagram to represent each component, the commms between them with plans to augment this with hostnames, ports, whether each comms link is resilient etc, etc. This all feels like something that must been done many times before. Are there standards for documenting this?

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• apt-mirror does not mirror the i18n directory

  - by Fred

  I need to setup a local Ubuntu mirror so the whole network doesn't need to hit remote servers in order to update and install new packages. Following a brief tutorial found here, I managed to get a server up and running that correctly mirrors packages from the main and restricted categories. However, when I call apt-get update on a client, I get a couple of errors such as : Ign http://192.168.1.18 karmic/main Translation-fr Ign http://192.168.1.18 karmic/restricted Translation-fr Checking back on the server, I see that apt-mirror only took the binary-amd64 directory of the mirror, and didn't take i18n that would provide Translation-fr. The manpage for apt-mirror doesn't say anything about i18n, and Google is of no help either. How do I properly mirror i18n? My current mirror.list file is as follows : ############# config ################## # # set base_path /var/spool/apt-mirror # # if you change the base path you must create the directories below with write privileges # # set mirror_path $base_path/mirror # set skel_path $base_path/skel # set var_path $base_path/var # set cleanscript $var_path/clean.sh # set defaultarch <running host architecture> # set postmirror_script $var_path/postmirror.sh set run_postmirror 0 set nthreads 20 set _tilde 0 # ############# end config ############## deb http://mirror.cc.columbia.edu/pub/linux/ubuntu/archive karmic main restricted deb http://mirror.cc.columbia.edu/pub/linux/ubuntu/archive karmic-updates main restricted clean http://mirror.cc.columbia.edu/pub/linux/ubuntu/archive

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• XenServer VMs can't reach network

  - by toto

  I'm currently trying to setup a small cloud architecture , I'm using in the installation CloudStack 2.2.14 which need two node : a management server (as node1) to provision the cloud and a hyperviser XenServer 5.6 SP2 to host the VMs (as node2). I succeded to create both node1 and node2 into an ESXi 5 VMWare as VMs. So The ESXi 5 is hosting two VMs node1 + node2 , and node2 which is the XenServer will host also VMs (such as ubuntu or Centos). Both node1 and node2 can ping each other and can get the internet connection from Esxi5 ,but My problem is : that VMs into the node2(XenServer) can't reach the network (can't ping node1 or Esxi or get an internet connection but they can ping VMs IN the node2(XenServer). So I tried to: 1-Setup a DHCP server as node3 in ESXi5 and connect node2(Xenserver) to him , but always the VMs into to node2 can't reach the outer network. 2-Setup a DCHP server into node2 , but always the same problem. So , 1-is there any other configuration i'm missing in node2 (considering that I'm sure about DNS , GW , NETMASK configuration)?. 2-Is it the problem because i'm Creating VMs into node2(XenSever) which is a VM into ESXi 5 ?

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• Encrypting peer-to-peer application with iptables and stunnel

  - by Jonathan Oliver

  I'm running legacy applications in which I do not have access to the source code. These components talk to each other using plaintext on a particular port. I would like to be able to secure the communications between the two or more nodes using something like stunnel to facilitate peer-to-peer communication rather than using a more traditional (and centralized) VPN package like OpenVPN, etc. Ideally, the traffic flow would go like this: app@hostA:1234 tries to open a TCP connection to app@hostB:1234. iptables captures and redirects the traffic on port 1234 to stunnel running on hostA at port 5678. stunnel@hostA negotiates and establishes a connection with stunnel@hostB:4567. stunnel@hostB forwards any decrypted traffic to app@hostB:1234. In essence, I'm trying to set this up to where any outbound traffic (generated on the local machine) to port N forwards through stunnel to port N+1, and the receiving side receives on port N+1, decrypts, and forwards to the local application at port N. I'm not particularly concerned about losing the hostA origin IP address/machine identity when stunnel@hostB forwards to app@hostB because the communications payload contains identifying information. The other trick in this is that normally with stunnel you have a client/server architecture. But this application is much more P2P because nodes can come and go dynamically and hard-coding some kind of "connection = hostN:port" in the stunnel configuration won't work.

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• How Does EoR Design Work with Multi-tiered Data Center Topology

  - by S.C.

  I just did a ton of reading about the different multi-tier network topology options as outlined by Cisco, and now that I'm looking at the physical options (End of Row (EoR) vs Top of Rack(ToR)), I find myself confused about how these fit into the logical constructs. With ToR it also maps 1:1: at the top of each rack there is a switch(es) that essentially act as the access layer. They connect via fiber to other switches, maybe chassis-based, that act as the aggregation layer, that then connect to the core layer. With EoR it seems that the servers are connecting directly to the aggregation layer, skipping the access layer all together, by plugging directly into what are typically chassis switches. In EoR then is the standard 3-tier model now a 2-tier model: the servers go to the chassis switch which goes straight to the core switch? The reason it matters to me is that my understanding was that the 3-tier model was more desirable due to less complexity. The agg switch pair acts as default gateway and does routing; if you use up all of your ports in your agg layer pair it's much more complicated to add additional switches, than simply adding more switches at the access layer. Are there other downsides to this layout? Does this 3-tier architecture still apply in some way in EoR? Thanks.

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• Squid reverse proxy array - siblings not communicating with each other

  - by V. Romanov

  I want to set up 2 squid servers to act as reverse proxy and cache for a webserver on our intranet. The load balancing will be done with DNS round robin or just different mappings for different clients. The thing is, I want both servers to try and contact each other to see if they have the object required in cache before contacting the webserver for it (the network that servers the webserver is the bottleneck and I'm trying to eliminate it) Both squids are configured the same, here are the relevant config lines : acl dvr1_cache_it_best_tv_com dstdomain dvr1.cache.it.best-tv.com acl squid1_it_best_tv_com dstdomain squid1.it.best-tv.com acl squid2_it_best_tv_com dstdomain squid2.it.best-tv.com http_access allow dvr1_cache_it_best_tv_com http_access allow squid1_it_best_tv_com http_access allow squid2_it_best_tv_com http_access allow all http_port 8081 accel defaultsite=dvr1.cache.it.best-tv.com cache_peer dvr1.origin.it.best-tv.com parent 80 0 no-query originserver name=Proxy_dvr1_origin_it_best_tv_com cache_peer squid1.it.best-tv.com sibling 8081 3130 weight=10 name=Proxy_Squid1_it_best_tv_com cache_peer squid2.it.best-tv.com sibling 8081 3130 weight=10 name=Proxy_Squid2_it_best_tv_com cache_peer_access Proxy_dvr1_origin_it_best_tv_com allow dvr1_cache_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow squid1_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow squid2_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow dvr1_cache_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow squid1_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow squid2_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow dvr1_cache_it_best_tv_com just to make it clear - dvr1.cache is the alias for the proxy servers. dvr1.origin is the web server. Both servers work, both serve content and cache it and work fine. However, when I clear the cache on one server and then access it, it gets the content from the parent (DVR1_ORIGIN) instead of going to the sibling squid. What did I configure wrong? Or perhaps I don't understand the architecture correctly? I read the squid manuals but as far as I see i did it all by the book and yet it doesn't work right. Any help will be appreciated!

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• Windows/IIS Hosting :: How much is too much?

  - by bsisupport

  I have 4 Windows 2003 servers running IIS 6. These servers host a bunch of unique web sites (in that they are all different in build/architecture/etc). The code behind these sites range from straight HTML, classic ASP, and 1.1/2.0/3.x flavors of .NET. Some (most) of the sites use a SQL backend, which is hosted on one or two different servers – not the IIS servers themselves. No virtualization on these servers and no load balancing for these particular sites. The problem I’m running into is coming up with some baseline metrics to determine, or basically come up with a “baseline score” to know when a web server has reached its hosting limit. Today, some basic information about each server is used: how much bandwidth does the server pump out, hard drive space availability, and basic (very basic) RAM & CPU utilization (what it looks like at peak traffic times.) I would be grateful if those of you that are 1000x smarter than I am could indulge me with your methods of managing IIS environments. Whether performance monitoring specifics, “score” determination as I’m trying to determine, or the obvious combination of both. Thanks in advance.

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• Protect all XML-RPC calls with HTTP basic auth but one

  - by bodom_lx

  I set up a Django project for smartphone serving XML-RPC methods over HTTPS and using basic auth. All XML-RPC methods require username and password. I would like to implement a XML-RPC method to provide registration to the system. Obviously, this method should not require username and password. The following is the Apache conf section responsible for basic auth: <Location /RPC2> AuthType Basic AuthName "Login Required" Require valid-user AuthBasicProvider wsgi WSGIAuthUserScript /path/to/auth.wsgi </Location> This is my auth.wsgi: import os import sys sys.stdout = sys.stderr sys.path.append('/path/to/project') os.environ['DJANGO_SETTINGS_MODULE'] = 'project.settings' from django.contrib.auth.models import User from django import db def check_password(environ, user, password): """ Authenticates apache/mod_wsgi against Django's auth database. """ db.reset_queries() kwargs = {'username': user, 'is_active': True} try: # checks that the username is valid try: user = User.objects.get(**kwargs) except User.DoesNotExist: return None # verifies that the password is valid for the user if user.check_password(password): return True else: return False finally: db.connection.close() There are two dirty ways to achieve my aim with current situation: Have a dummy username/password to be used when trying to register to the system Have a separate Django/XML-RPC application on another URL (ie: /register) that is not protected by basic auth Both of them are very ugly, as I would also like to define a standard protocol to be used for services like mine (it's an open Dynamic Ridesharing Architecture) Is there a way to unprotect a single XML-RPC call (ie. a defined POST request) even if all XML-RPC calls over /RPC2 are protected?

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• Server slowdown

  - by Clinton Bosch

  I have a GWT application running on Tomcat on a cloud linux(Ubuntu) server, recently I released a new version of the application and suddenly my server response times have gone from 500ms average to 15s average. I have run every monitoring tool I know. iostat says my disks are 0.03% utilised mysqltuner.pl says I am OK other see below top says my processor is 99% idle and load average: 0.20, 0.31, 0.33 memory usage is 50% (-/+ buffers/cache: 3997 3974) mysqltuner output [OK] Logged in using credentials from debian maintenance account. -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.1.63-0ubuntu0.10.04.1-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in MyISAM tables: 370M (Tables: 52) [--] Data in InnoDB tables: 697M (Tables: 1749) [!!] Total fragmented tables: 1754 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 19h 25m 41s (1M q [28.122 qps], 1K conn, TX: 2B, RX: 1B) [--] Reads / Writes: 98% / 2% [--] Total buffers: 1.0G global + 2.7M per thread (500 max threads) [OK] Maximum possible memory usage: 2.4G (30% of installed RAM) [OK] Slow queries: 0% (1/1M) [OK] Highest usage of available connections: 34% (173/500) [OK] Key buffer size / total MyISAM indexes: 16.0M/279.0K [OK] Key buffer hit rate: 99.9% (50K cached / 40 reads) [OK] Query cache efficiency: 61.4% (844K cached / 1M selects) [!!] Query cache prunes per day: 553779 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 34K sorts) [OK] Temporary tables created on disk: 4% (4K on disk / 102K total) [OK] Thread cache hit rate: 84% (185 created / 1K connections) [!!] Table cache hit rate: 0% (256 open / 27K opened) [OK] Open file limit used: 0% (20/2K) [OK] Table locks acquired immediately: 100% (692K immediate / 692K locks) [OK] InnoDB data size / buffer pool: 697.2M/1.0G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries Increase table_cache gradually to avoid file descriptor limits Variables to adjust: query_cache_size (> 16M) table_cache (> 256)

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• Protect all XML-RPC calls with HTTP basic auth but one

  - by bodom_lx

  I set up a Django project for smartphone serving XML-RPC methods over HTTPS and using basic auth. All XML-RPC methods require username and password. I would like to implement a XML-RPC method to provide registration to the system. Obviously, this method should not require username and password. The following is the Apache conf section responsible for basic auth: <Location /RPC2> AuthType Basic AuthName "Login Required" Require valid-user AuthBasicProvider wsgi WSGIAuthUserScript /path/to/auth.wsgi </Location> This is my auth.wsgi: import os import sys sys.stdout = sys.stderr sys.path.append('/path/to/project') os.environ['DJANGO_SETTINGS_MODULE'] = 'project.settings' from django.contrib.auth.models import User from django import db def check_password(environ, user, password): """ Authenticates apache/mod_wsgi against Django's auth database. """ db.reset_queries() kwargs = {'username': user, 'is_active': True} try: # checks that the username is valid try: user = User.objects.get(**kwargs) except User.DoesNotExist: return None # verifies that the password is valid for the user if user.check_password(password): return True else: return False finally: db.connection.close() There are two dirty ways to achieve my aim with current situation: Have a dummy username/password to be used when trying to register to the system Have a separate Django/XML-RPC application on another URL (ie: /register) that is not protected by basic auth Both of them are very ugly, as I would also like to define a standard protocol to be used for services like mine (it's an open Dynamic Ridesharing Architecture) Is there a way to unprotect a single XML-RPC call (ie. a defined POST request) even if all XML-RPC calls over /RPC2 are protected?

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• Stepmania + KDE4 = sound problem

  - by picca

  I cannot manage to get KDE4 + stepmania working. If I run StepMania I always get: StepMania 3.9 Log starting 2010-12-24 14:52:48 Loading window: gtk OS: Linux ver 020636 Crash backtrace component: x86 custom backtrace Crash lookup component: dladdr Crash demangle component: cxa_demangle Runtime library: glibc 2.11.2 Threads library: NPTL 2.11.2 TLS is available ALSA: Advanced Linux Sound Architecture Driver Version 1.0.23. ALSA Driver: 0: HDA ATI SB [SB], device 0: STAC92xx Analog [STAC92xx Analog], 0/1 subdevices avail ALSA Driver: 0: HDA ATI SB [SB], device 1: STAC92xx Digital [STAC92xx Digital], 1/1 subdevices avail Couldn't load driver ALSA: dsnd_pcm_open(hw:0): Device or resource busy Mixing 0.000000 ahead in 0 Mix() calls Couldn't load driver ALSA-sw: dsnd_pcm_open(hw:0): Device or resource busy Mixing 0.000000 ahead in 0 Mix() calls Couldn't load driver OSS: RageSound_OSS: Couldn't open /dev/dsp: Device or resource busy Language: english Theme: default Error: Couldn't find a sound driver that works I found that in StepMania/Data/StepMania.ini I should add following line: SoundDevice=default That enables me to run StepMania, but I don't have any sound. Which is pretty bad for an application like this one. I'm quite sure that the problem is in phonon that is blocking the audio device to which StepMania needs to access directly. I think that I can fix this if I run other (lighter) window-manager than KDE4. But that is not a solution occasional linux user. Do I have any chance to get StepMania under KDE4 completely working?

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• Blocking of certain file downloads

  - by Philip Fourie

  I have a problem where I cannot completely download a certain file from a server. The file is 1.9MB in size but only 68% is downloaded and then it hangs. I tried and these cases, which failed: Downloaded the file with HTTP Downloaded the file with FTP Moved the file to different FTP and web servers behind the ISA firewall Tried with IIS 6.0 & IIS 7.0 Multiple download clients. Which included FireFox, FileZilla (on Windows) and wget (on Linux) This worked: Downloading other files from the same location on the server. Both bigger and smaller and in size than the original. FTP and HTTP worked. Earlier version of this file (.DLL) works. It is as if the content of this file has an influence on this file being served. Network architecture: Client Machine - Internet (ISP) - ISA Server - IIS 7.0 The only constants are the ISP, Cisco router and the ISA server. Is it possible that something is rejecting the download because of the contents of the file? I am hoping ISA is the culprit... I am not a ISA expert is there somewhere I can look to establish if it is indeed ISA causing this? Update: Splitting the file into two parts with a hex editor results in one half of the file being served correctly and the other part not. Zipping the file results in the file being downloaded successfully. However this is not an option for this particular scenario. Renaming the file and its extension also doesn't work. Update 2009/10/22: It does NOT seems to be ISA that is causing this problem. We connected a laptop (running IIS) on an available public IP and still the file download to 68% before it hanged. The two remaining components are the ISP and the Cisco 800 series router. Anyone knows about an issue on the router perhaps?

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