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• using munin-plugins-rails to monitor rails app perfromance

  - by user2099762

  I have been trying to configure munin-plugins-rails to monitor the performance of our rails apps from Munin. The graphs appear, but no data is shown in the graphs. The log files show Error output from : 2013/06/27-15:39:06 [5540] Request-log-analyzer, by Willem van Bergen and $ 2013/06/27-15:39:06 [5540] Website: http://railsdoctors.com I have tried running Request-log-analyzer manually and pointing it at the production log file, and this reports as % for every item. There is data in the log file. I have tried changing the version of the gems installed, and also the type of the log file, but no luck. Any ideas anyone? Thanks

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• MySQL Windows vs. Linux: performance, caveats, pros and cons?

  - by gravyface

  Looking for (preferrably) some hard data or at least some experienced anecdotal responses with regards to hosting a MySQL database (roughly 5k transactions a day, 60-70% more reads than writes, < 100k of data per transaction i.e. no large binary objects like images, etc.) on Windows 2003/2008 vs. a Debian-based derivative (Ubuntu/Debian, etc.). This server will function only as a database server with a separate Web server on another physical box; this server will require remote access for management (SSH for Linux, RDP for Windows). I suspect that the Linux kernel/OS will compete less than the Windows Server for resources, but for this I can't be certain. There's also security footprint: even with Windows 2008, I'm thinking that the Linux box can be locked down more easily than the Windows Server. Anyone have any experience with both configurations?

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• Is a larger hard drive with the same cache, rpm, and bus type faster?

  - by Joel Coehoorn

  I recently heard that, all else being equal, larger hard are faster than smaller. It has to do with more bits passing under the read head as the drive spins - since a large drive packs the bits more tightly, the same amount of spin/time presents more data to the read head. I had not heard this before, and was inclined to believe the the read heads expected bits at a specific rate and would instead stagger data, so that the two drives would be the same speed. I now find myself looking at purchasing one of two computer models for the school where I work. One model has an 80GB drive, the other a 400GB (for ~$13 more). The size of the drive is immaterial, since users will keep their files on a file server where they can be backed up. But if the 400GB drive will really deliver a performance boost to the hard drive, the extra money is probably worth it. Thoughts?

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• azure website restart and take old dll version

  - by vipul dumaniya

  One of my site is hosted on windows azure and when azure restart site from manage windows azure panel. then it take old version dll and site is down until we restart the site by deploying global.asax or change in web.config to restart the site. after deployment of global.asax or change in web.config site is restart and then it work perfectly and take latest dll. so if any issues with my code then it should not work after the restart by deploying global.asax file so i think issues is not from code side. Error like "Could not load type 'DSF.DATA.Repository.RecurringOrderLogResposity' from 'DSF.DATA Version 1.0.0" I am just deploying changed dll using FTP & site restart and take effect successfully I have already resolve this error and uploaded latest dll too but when site restart from azure panel it back and then site down until i restart the site by deploying global.asax file so i think issues is not from code side. please please help I am in big trouble as my site is live site and there are lot of traffic Thanks Vipul

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• Web application design with distributed servers

  - by Bonn

  I want to build a web application/server with this structure: main-server sub-server transaction-server (create, update, delete) view-server (view, search) authentication-server documents-server reporting-server library-server e-learning-server The main-server acts as host server for sub-server. I can add many sub-servers and connect it to main-server (via plug-play interface maybe), then it can begin querying data from another sub-servers (which has been connected to the main-server). The sub-servers can be anywhere as long as connected to internet. The main-server can manage all sub-servers which are connected to it (query data, setting permission between sub-servers, etc). The purpose is simple, the web application will be huge as the company grows, so I want to distribute it into small connected plug-able servers. My question is, does the structure above already have a standardized method? or are there any different views? what are the technologies needed? I need a lot of researches before the execution plan begin. thanks a lot.

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• Is my HD broken? Can i use it for anything?

  - by acidzombie24

  Someone suggested formatting my HD so i wont try to read bad data. From what i understand the OS marks which clusters are bad and skips them. So after copying all my data i did a quick format to NTFS. I copied files with an error then i right clicked and tried to create a new folder. I was greeted by this message. I have 926 of 931gb free. Is my external HD broken?

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• Apache not directing to correct VHost

  - by BANANENMANNFRAU

  I have setup the following virtual host ServerAdmin [email protected] ServerName mysite.com ServerAlias www.mysite.com DocumentRoot /var/www/homepage/public_html ErrorLog ${APACHE_LOG_DIR}/error.log CustomLog ${APACHE_LOG_DIR}/access.log combined When I hit my url Apache still shows the default page. Not the index Ive created in the give Document root. In my Domain i have set the A Record to the Ip of my VPS: apache2ctl -S: output: VirtualHost configuration: *:80 is a NameVirtualHost default server xxxxxx.stratoserver.net (/etc/apache2/sites-enabled/000-default.conf:1) port 80 namevhost xxxxxxx.stratoserver.net (/etc/apache2/sites-enabled/000-default.conf:1) port 80 namevhost mysite.com (/etc/apache2/sites-enabled/homepage.conf:1) alias www.mysite.com ServerRoot: "/etc/apache2" Main DocumentRoot: "/var/www" Main ErrorLog: "/var/log/apache2/error.log" Mutex default: dir="/var/lock/apache2" mechanism=fcntl Mutex mpm-accept: using_defaults Mutex watchdog-callback: using_defaults PidFile: "/var/run/apache2/apache2.pid" Define: DUMP_VHOSTS Define: DUMP_RUN_CFG User: name="www-data" id=33 not_used Group: name="www-data" id=33 not_used How would I need to setup my Virtual host so that apache shows the correct site depending on the Domain im redirecting from.

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• What if a computer with Ethernet

  - by George Nixon

  I'm just revising for an exam on Networks and Data Communications, and there's one thing I don't get about CSMA/CD and Ethernet. It's supposed to be fairly stable, for instance if a computer drops out of the network, it's not a problem like it might be in a token ring network (I think). But Ethernet works by all the other computers waiting for the currently transmitting computer to finish what it's doing, and then the others use CMSA/CD to determine who goes next. What if one computer malfunctioned and kept sending a continuous stream of data in an infinite loop? In fact, is there a standard time for pcs to transmit before they yield to others?

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• Why my /usr/share/file/magic is not found, in PHP at CentOS?

  - by Vincenzo

  This is what I'm doing: $ php <?php $finfo=finfo_open(FILEINFO_MIME, '/usr/share/file/magic'); This is what I'm getting: PHP Notice: finfo_open(): Warning: description `8-bit ISDN mu-law compressed (CCITT G.721 ADPCM voice data enco' truncated in - on line 2 PHP Notice: finfo_open(): Warning: description `8-bit ISDN mu-law compressed (CCITT G.721 ADPCM voice data enco' truncated in - on line 2 PHP Notice: finfo_open(): Warning: <= not supported in - on line 2 PHP Notice: finfo_open(): Warning: <= not supported in - on line 2 PHP Notice: finfo_open(): Warning: <= not supported in - on line 2 PHP Notice: finfo_open(): Warning: >= not supported in - on line 2 PHP Warning: finfo_open(): Failed to load magic database at '/usr/share/file/magic'. in - on line 2 This is a clean CentOS 5.5 installation, PHP 5.3. The file /usr/share/file/magic exists and is accessible.

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• Can't ping self

  - by Paddy

  I have a wireless internet connection setup on my Mac. (v10.5.6) Am connected to the internet and everything is running smoothly. I recently discovered a quirky behaviour while setting up apache web server. When i typed in my dynamic ip (http://117.254.149.11/) in the webbrowser to visit my site pages it just timed out. In terminal i tried pinging localhost and it worked. $ ping localhost PING localhost (127.0.0.1): 56 data bytes 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.063 ms 64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.056 ms 64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.044 ms But if i pinged my ip it would just time out. $ ping 117.254.149.11 PING 117.254.149.11 (117.254.149.11): 56 data bytes ^C --- 117.254.149.11 ping statistics --- 10 packets transmitted, 0 packets received, 100% packet loss Pinging any other site works though. I am completely stumped. Any help would be greatly appreciated.

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• Nginx + PHP FASTCGI FAILS - how to debug ?

  - by Niro

  I have a server on AMAZON EC2 running Nginx +PHP with PHP FASTCGI via port 9000. The server runs fine for a few minutes and after a while (several thousands of hits in this case) FastCGI Dies and Nginx returns 502 Error. Nginx log shows 2010/01/12 16:49:24 [error] 1093#0: *9965 connect() failed (111: Connection refused) while connecting to upstream, client: 79.180.27.241, server: localhost, request: "GET /data.php?data=7781 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "site1.mysite.com", referrer: "http://www.othersite.com/subc.asp?t=10" How can I debug what is causing FastCGI to die?

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• Varnish doesn't seem to be caching

  - by Charlie Somerville

  I've setup a Varnish cache mirror to sit in front of a file server, but it seems to be endlessly re-downloading data from my file server. There's about 100GB of data in total, but so far Varnish has downloaded 800GB from my file server. I'm using the default VCL file that comes with Varnish and the response headers for files served by the file server are similar to the following: HTTP/1.1 200 OK Cache-Control: max-age=290304000, public Content-Type: image/jpeg Expires: Wed, 29 Dec 2010 21:38:33 GMT Server: Microsoft-IIS/7.0 E-Tag: "8b4723296ab697530768f18b1378b269" Content-Disposition: inline; filename=image046.jpg; X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Thu, 23 Dec 2010 05:38:33 GMT Content-Length: 100592 I'm starting varnishd with the following options: varnish/sbin/varnishd -a 0.0.0.0:80 -f varnish/etc/varnish/default.vcl -s file,varnish/var/lib/varnish/varnish_storage.bin,100G

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• memcached install issues with lib event on server

  - by albert N

  I've installed libevent on my server in the directory root/data/ and have i'm about to install memcached with ./configure –with-lib-event=/data/; make; make install However, after running a bit I get this error saying i'm pointing to the wrong directory for libevent. checking for libevent directory... configure: error: libevent is required. You can get it from http://www.monkey.org/~provos/libevent/ If it's already installed, specify its path using --with-libevent=/dir/ make: *** No targets specified and no makefile found. Stop. make: *** No rule to make target `install'. Stop. Any suggestions. I am not experience with cli so anything is help. Thanks!

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• Formatting a disk for Macintosh using Linux

  - by Ken Bloom

  I've been asked to move data from an old external hard drive to a new one, and to make the new one compatible with the Macintosh. (The old drive's USB connection has died, and I'm connecting to old the drive using a PC card that provieds an eSATA to the drive. The recipient's Macintosh doesn't have a PC card slot, so she can't access the old drive anymore. Hence, the new drive.) Naturally, I'm doing this data transfer using Linux. I've discovered that I can format the drive as HFS+ using mkfs.hfsplus from the hfsprogs package. But I need to know: do I need to do anything special with the partition table? Is there a special Macintosh partition table format that I need to format this disk to? If so, what tools can I use to get the right format for the partition table?

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• backup software that ignores user rights

  - by Chris

  Hi, As a computer technician I have to reinstall systems allmost daily (when it can't be repaired ;-)) My problem is that I recover user files by hand and a external mounting device. Most of the time it works fine, but also weekly I have systems with passwords and personal files which are often not sucessfull recovered. I know you can change owner, but when people have 30 GB's af data, my backup computer works for ages to change the rights. Can anyone think of software (commercial is no problem) which does the following: * backup user data without having user rights troubles * have a option to choose what to backup (email accounts, documents, etc, etc) even when it's externaly mounted, in short, it reconizes the folder structure) * Works on different OS's like XP, Vista, W7

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• PostgreSQL disaster recovery options

  - by Alex

  My customer has quite a large (the total "data" folder size is 200G) PostgreSQL database and we are working on a disaster recovery plan. We have identified three different types of disasters so far: hardware outage, too much load and unintentional data loss due to erroneously executed bad migration (like DELETE or ALTER TABLE DROP COLUMN). First two types seem to be easy to mitigate but we can't elaborate a good mitigation plan for the third type. I proposed to use ZFS and frequent (hourly) snapshots but "ZFS" means "OpenIndiana" these days and our Ops engineers do not have much expertise in it, so using OpenIndiana imposes another risk. Colleagues try to convince me that restoring from PostgreSQL PITR backup can be as fast as restoring from a ZFS snapshot but I highly doubt that replaying, say, 50G of archived WALs can be considered "fast". What other options are we missing? Is ZFS an only viable alternative? Can we get a fast Pg DB restore time in the Linux environment?

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• What is a good partitioning design/scheme for a multi-boot *nix system?

  - by static

  I'm planning to install Debian on my server. I would like to design the partitioning scheme in such a way, that I could install one or more other *nix distributives on that. So, reading many articles I think this scheme could be a good one for the initial idea of multi-boot: /grub /swap /LVM VG1 (for OS1) -> /boot (LV1) / (LV2) /tmp (LV3) /var ... /var/log /home /LVM VG2 (for OS2) -> /boot / /tmp /var /var/log /home ... (other distros) /LVM VG0 (for data) -> /data (LV1) But I'm confused a little bit now: what should be the labels for these partitions (unique or not) and what should be the mounting points looking as (/home (OS1) mounted to /home as well as /home (OS2)...)?

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• How to set up raid monitoring on a Adaptec AAC-RAID on a Dell?

  - by pjz

  I've got Debian on a Dell with an Adaptec RAID: AAC0: kernel 4.1-0[7417] AAC0: monitor 4.1-0[7417] AAC0: bios 4.1-0[7417] AAC0: serial 4edf09 scsi2 : aacraid Vendor: CERC Model: DATA 1 Rev: V1.0 Type: Direct-Access ANSI SCSI revision: 02 Vendor: CERC Model: Data 2 Rev: V1.0 Type: Direct-Access ANSI SCSI revision: 02 I've got it set up using the fine afacli tool (ick). Is there a way to get it to email me when there's an error? Do I need to hand-roll a script for this? what's the right version of the afacli tool to use? v4.1 gets SIGABRT and exits after I ask it to 'container list' or 'enclosure list' v2.8's enclosure commands don't work either Do I need to upgrade firmware? to what? from where? how?

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• What is the simplest and fastest way to transfer large file through a Windows network?

  - by Sake

  I have a Window Server 2000 machine running MS SQL Server that stores over 20GB of data. The database is backed-up every day to the second harddrive. I want to transfer those backup files to another computer to build another test server and for recovery practicing. (the backup never actually got restored for almost 5 years. Don't tell my boss about that!) I have trouble transfering that huge file through the network. I've tried plain network copy, apache download, and ftp. Any method I tried end up failing when the amount of data transfered reach 2GB. The last time that I successfully transfered the file, it was through a usb attached external harddrive. But I want to perform this task routinely and preferably automatically. Wonder what is the most pragmatic approach for this situation ?

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• Solaris mounting partitions

  - by Benco

  I'm trying to mount a partition in solaris 10... bash-3.00# mount /dev/dsk/c0t0d0s3 /data mount: /dev/dsk/c0t0d0s3 is already mounted or /data is busy As far as I know c0t0d0s3 isn't already mounted elsewhere, so what's really going on here? From /etc/mnttab : /dev/dsk/c1t0d0s0 / ufs rw,intr,largefiles,logging,xattr,onerror=panic,dev=7800001285811136 /devices /devices devfs dev=4840000 1285811125 ctfs /system/contract ctfs dev=48c0001 1285811125 proc /proc proc dev=4880000 1285811125 mnttab /etc/mnttab mntfs dev=4900001 1285811125 swap /etc/svc/volatile tmpfs xattr,dev=4940001 1285811125 objfs /system/object objfs dev=4980001 1285811125 sharefs /etc/dfs/sharetab sharefs dev=49c0001 1285811125 /usr/lib/libc/libc_hwcap1.so.1 /lib/libc.so.1 lofs dev=780000 1285811131 fd /dev/fd fd rw,dev=4b40001 1285811136 swap /tmp tmpfs xattr,dev=4940002 1285811137 swap /var/run tmpfs xattr,dev=4940003 1285811137 -hosts /net autofs nosuid,indirect,ignore,nobrowse,dev=4c00001 1285811148 auto_home /home autofs indirect,ignore,nobrowse,dev=4c00002 1285811148 cordb:vold(pid530) /vol nfs ignore,noquota,dev=4bc0001 1285811149 I suspect the problem is not related to the mount point, but rather the disk slice I'm trying to mount: bash-3.00# newfs -v /dev/dsk/c0t0d0s3 /dev/rdsk/c0t0d0s3: Device busy

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• Single hardware unit to protect web servers and implement smart publishing

  - by Maxim V. Pavlov

  Thus far we've been using the combination of Forefront TMG 2010 as an edge firewall + intrusion prevention system + web site publishing mechanism in the data center to work with a few web server machines. Since we develop on ASP.NET, we are IIS and in general - Microsoft crowd. Since TMG is being deprecated, we need to come up with a hardware alternative to protect and serve our data center web cloud. Could you please advise a hardware or virtual appliance solution that can provide routing, flood prevention and smart web-site publishing (one IP - many web sites based on domain name filter) all in one. Even if it is hard to configure, as long as it covers all these features, we will invest to learn and replace TMG eventually.

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• txt file descriptor in lsof

  - by wfaulk

  In my experience, files that have the file descriptor of txt in lsof output are the executable file itself and shared objects. The lsof man page says that it means "program text (code and data)". While debugging a problem, I found a large number of data files (specifically, ElasticSearch database index files) that lsof reported as txt. These are definitely not executable files. The process was ElasticSearch itself, which is a java process, if that helps point someone in the right direction. I want to understand how this process is opening and using these files that gets it to be reported in this way. I'm trying to understand some memory utilization, and I suspect that these open files are related to some metrics I'm seeing in some way. The system is Solaris 10 x86.

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• How to put a rgb image on gnuplot 3d plot?

  - by Stefano Borini

  I want to plot an rgb image with gnuplot, and it must be hovering inside a 3d plot box, so that it can act as a "floor" for my data. How can I do it ? THe gnuplot examples use a heatmap to map the rgb values, but this is not what I want. Apart from receiving an error GNUPLOT (plot_image): Color boxes cannot handle RGB components. It is not what I want in any case. I need the full rgb data in the box, not mapped through a heatmap.

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• How do I clone an Ubuntu server under VMWare

  - by dave

  I have a Ubuntu 12.04 server running under VMWare. As best as I can tell, the VMWare vmbk file has been corrupted. The server is operating normally, but this is preventing backups (using Veeam). To remedy this, I'd like to create a duplicate VM without the corruption issue. However, with the corrupted file VMWare can't help me, eg. create a simple clone. I can create a new VM. How do I clone the configuration / data from my problematic server into the new one? Updated: just to clarify: I realise I can't use the VMWare clone tools. I will manually create a new VM (with a base O/S if necessary). How to I replicate the O/S and data from one VM into another?

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• Making fdisk see software RAID 0

  - by unknownthreat

  I am following http://grub.enbug.org/Grub2LiveCdInstallGuide and I am using software RAID 0. I am using Ubuntu 10.10 LiveCD and is trying to restore grub2 after installing Windows 7 in another partition. Here is the console's outputs: ubuntu@ubuntu:~$ sudo fdisk -l Unable to seek on /dev/sad ubuntu@ubuntu:~$ sudo dmraid -r /dev/sdb: nvidia, "nvidia_acajefec", stripe, ok, 488397166 sectors, data@ 0 /dev/sda: nvidia, "nvidia_acajefec", stripe, ok, 488397166 sectors, data@ 0 So do you have an idea for how to make fdisk see my RAID array? How to make fdisk detect the Software RAID like dmraid?

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