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  • Inconsistent slow DB connect times

    - by mcryan
    I have an app that shows significantly increased load times every 5 minutes. We use New Relic and I've been able to identify that every slow request is due to our DB connect functions. I've looked through our frontend servers and db servers and have ensured that there are no cronjobs running every 5 minutes - though the increase comes every 5 minutes without fail. I feel like I've tried everything I can to isolate this but I'm not having any luck. It is not coming from a cronjob, there is no cache expiring every 5 minutes, etc. What else could I check, and does anyone know of anything that could cause this sort of behavior? For what it's worth - our stack includes Apache, PHP, MySQL, Varnish and Memcache. SQL and memcache are running on dedicated servers and we have a number of frontend servers behind a load balancer, each running Apache and Varnish. Spike every 5 minutes: And it's always db connect (in red) taking up all of the time:

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  • Windows NLB + IIS - Stops serving pages

    - by Ye Ol Developer
    We are currently running Windows NLB and IIS7 load balanced across two servers. What happens is randomly and sporadically the servers stop serving web pages. What we have noticed is that if we run the sites on a dedicated IP on either of the servers, these issues do not exist. As soon as we switch back to the load balanced IP, then everything goes awry. When the servers stop serving pages, we can still TS into the server and surf them internally without issues, or switch to the dedicated IP. However the internal network cannot even access the files from the load balanced IP. We are running out of idea's here. Has anyone had a similar problem?

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  • What method of MySQL mirroring should I use for this?

    - by user45745
    I'm running an web application hosting service (basically hosting forums for free), and I have two remote servers at my disposal. The code for the application is stored on both servers and isn't a problem, but I'm wondering how to deal with the databases. When someone goes onto a site *.example-host.com, they are sent to one of the two servers and both must be capable of loading the forums from a database. The database must also have write access, for when new members register or post topics etc. The main requirement is speed, but uptime is also important (if a server goes out, the site should still work). I have a few options, but I'm inexperienced and not sure which to go with: 1) [PHP] Split the forum records 50:50 between the two servers. If a server does not have the record for a forum requested, it can request it from the other by remote MySQL and load it. This idea sounded okay, until I realised that 50% of the time, users would be waiting significantly longer for pages to load. I also realised that if one of the servers went down, half the forums would be inaccessible and registrations would have to be disabled. 2) [MySQL] Dual master replication. This would attempt to mirror the two databases and sounds perfect, but I've heard that it can be very problematic. I don't know how fast this is. 3) [MySQL] Use a standard replication, distribute read only queries on both nodes and read/write queries to the master. This sounds like a good option, but again, I'm not sure on speed. I also don't know what would happen if the master server went down. If you have any other suggestions, please post them :)

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  • What are the methods of separating network spaces in a LAN?

    - by dash17291
    Please detail me the methods. My thoughts: put the servers in separate (sub)networks the servers are forced to go through the firewall but no NAT is required assign more IP addresses to the internal interface of the server choosing gateway addresses from the clients and servers IP address ranges split DNS Netfilter/{iptables, ipset} could be heavily involved, I'm talking about Linux servers. See for example: Destination NAT Onto the Same Network from internal clients Please do not explain what is NAT or DNS. This is a theoretical question, but my poor English knowledge prevent me to describe it in a fancy fashion.

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  • How do I use a period in a Quicksilver object (search for a file with a period)?

    - by studgeek
    How do I use a period in a Quicksilver object to do things like search for a file with a period? By default pressing period anywhere in an object causes Quicksilver to switch to text mode. Optimally I would like period to only enter text mode when its at the start of the object. Or perhaps there is a wildcard I can use (* doesn't seem to work and . obviously doesn't :). Or perhaps there is an escape sequence for period?

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  • Win 7 64-bit - looking for command line interface for setting Index properties for many files

    - by Sherryl
    I'm looking for a way to set a group of File Types to "Index Properties and File Contents" (Control Panel, Indexing Options, Advanced Options, File Types). Basically I'd like to write a batch file that switches that setting for a large group of file types and be able to share it with my entire team. Clicking in the UI is time consuming for everyone. This is a great solution for bringing up the GUI, but I'd like to create a batch file What is the command line for Indexing Options?

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  • How do I recover JPEGs with no file size?

    - by Jill
    I downloaded some wedding photos into my external drive about a month ago. A total of 3 cards were downloaded into 3 different files. The first file lists all of the photos, about 600 images, but they have zero bytes. The other 2 files are fine. I can't recover the compact flash card because I have used it too many times since then. Is there any way to recover the images on my drive?

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  • Is there a way to replicate a very large file shares in real-time?

    - by fsckin
    I have an hourly cron job that copies about 40GB of data from a source folder into a new folder with the hour appended on the end. When it's done, the job prunes anything older than 24 hours. This data changes very often during work hours and is on a samba file share. Here's how the folder structure looks: \server\Version.1 \server\Version.2 \server\Version.3 ... \server\Version.24 The contents of each new folder compared to the last one usually doesn't change very much, since this is a hourly job. Now you might be thinking that I'm an idiot for setting dreaming this up. Truth is, I just found out. It's actually been used for years and is so incredibly simple, anyone could delete the ENTIRE 40GB share (imagine that dialog spooling up... deleting thousands and thousands of files) and it would actually be faster to restore by moving the latest copy back to the source than it took to delete. Brilliant! Now to top this off, I need to efficiently replicate this 960GB of "mostly similar" data to a remote server over WAN link, with the replication happening as close to real-time as possible -- think hot spare, disaster recovery, etc. My first thought was rsync. Total failure. Rsync sees it sees a deletion of the folder that is 24 hours old and the addition of a new folder with 30GB of data to sync! I also looked at rdiff-backup and unison, they both appear to use similar algorithms and do not keep enough meta-data to do this intelligently. Best thing that I can find "out of the box" to do this is Windows Server "Distributed Filesystem Replication" which uses "Remote Differential Compression" -- After reading the background information on how this works, it actually looks like exactly what I need. Problem: Both servers are running Linux. D'oh! One approach to this I'm looking at is this, say it's 5AM and the cron job finishes: New Version.5 folder arrives at on local server SSH to remote server and copy Version.4 to Version.5 Run rsync on the local server pushing changes to the remote server. Rsync finally knows to do a differential copy between Version.4 and Version.5 Is there a smarter way to replicate Samba shares as close to real-time as possible? Anything out there that does "Remote Differential Compression" on Linux?

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  • How to enable a Web portal-based enterprise platform on different domains and hosts without customization

    - by S.Jalali
    I work at Coscend, a cloud and communications software product company. We have built a Web portal-based collaboration platform that we would like to host on five different Windows- and Linux-based servers in different hosting environments that run Web servers. Each of these Windows and Linux servers have a different host name and domain name (and IP address). Out team would appreciate your guidance on: (1) Is there a way to implement this Web portal-based platform on these Linux servers without customizing the host name, domain name and IP address for each individual instance? (2) Is there a way to create some variables using JavaScript for host name and domain name and call them from the different implementations? (3) Can these JavaScript modules be made portable and re-usable object modules for different environments and instances? The portal is written in JavaScript that is embedded in HTML5 and padded with CSS3. Other technologies include Flash, Flex. Databases used are PostgreSQL and MySQL.

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  • SSL certificates: how to use it?

    - by Rod
    I have a central server and I want to purchase a SSL certificate for it. The architecture is based on this central server and many connected web-servers which are on the client-side (one for each user). A client could access both the main server and its local server. Moreover the two servers exchange data between them. I would like client's web browser to trust all servers and always activating https and a secure connection when connecting to them. Assuming I can name all servers on the same domain name (I was thinking about a wildcard certificate anyway), which kind of certificate or use of it can make these secure connections working? There is the possibility that main server and client side server are not connected for a while. Is possible to activate an https connection for a client to its local server in this case? When I will need to renew or change the certificate, I would like to change it just on the main server avoiding to have the need of touch all the servers on the side of clients. Can I do that in some way?

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  • What are the ways to build a failover cluster?

    - by light
    I have a task where I need to build a failover cluster in two cases: first with servers on Red Hat Enterprise 5.1 and second with SUSE Linux Enterprise 11 SP1. Both cases have SAN. I know there are many ways to build failover cluster, but I can’t find out more, so I need next: The ways to build it? I know only virtualization. Any good book or resource to broad my mind? I’ll be glad to hear any suggestion. Thanks! EDIT #1: failover of servers with bussiness application on it. EDIT #2: will be great to hear summary about solutions with SLES servers? EDIT #3: So if I understand correctly, in my cases the main ways are to use internal solutions or virtualization. So now I have additional questions: Does manufacturer of blades provide some solution? For example HP or IBM. (Without virtualization) Do I need additional server to control "heartbeat" between main and redundant servers? (Virtualization) For example I have several physical servers with VMs. Do I need additional server to control availability of VMs and to move VMs to another physical server in the case their physical server failure? Sorry for my poor English. EDIT #4: Failover of VM or OS on physical server. In both cases will be used SAN , it's not specified, but I think with file system image on it. I started to think that my question is stupid and I need to remake it.

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  • How to time batch file execution using timethis.exe?

    - by unknown
    While timethis.exe works fine for almost every application, it seems to fail for .bat files: C:\test>timethis test.bat TimeThis : Command Line : test.bat TimeThis : Start Time : Fri Feb 26 19:46:30 2010 'test.bat' is not recognized as an internal or external command, operable program or batch file. TimeThis : Command Line : test.bat TimeThis : Start Time : Fri Feb 26 19:46:30 2010 TimeThis : End Time : Fri Feb 26 19:46:30 2010 TimeThis : Elapsed Time : 00:00:00.070 While executing it on a regular command line is fine, timethis.exe fails for it. How do I fix this problem?

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  • Use backups if unavailable (not just down)

    - by PriceChild
    Using haproxy, I want: A pool of 'main' servers and 'backup' servers, though they don't necessarily have to be in separate pools. Each backend has a low 'maxconn' (in this case 1) Clients should not wait in a queue. If there are no immediately available servers in the 'main' pool they should be shunted to the 'backup' pool without delay. Right now I have one backend, 'main' servers have an absurdly high weighting and it 'works'. acl use_backend + connslots is along the right lines but without the patch in my own answer it isn't perfect. Bonus points for not requiring a modified haproxy binary.

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  • Tomcat, change webapp to log to its own file.

    - by nos
    I've a webapp that apparently uses the standard java.util.Logging (no log4j or other stuff). Everything is logged under "com.bzsearchj.". I'm assuming I can configure Tomcat 6, via $CATALINA_HOME/conf/logging.properties to have it log everything under com.bzsearcj. to its own file, bonus if I can make it rotate daily - right now everything gets logged to the catalina-xxx.log What do I put in the conf/logging.properties to do this ?

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