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• Failing RAM, or something else? [closed]

  - by Thanatos

  I have a IBM Thinkpad T43, currently running Windows XP. Programs were crashing, XP was blue-screen-of-deathing, (more than usual) - it was basically unusable, but I couldn't get any informative error out of XP. I booted Ubuntu off a thumbdrive, which made it to the desktop, but as soon as I started to try to do anything, X segfaulted, along with several other services, followed quickly by kernel warnings and a kernel panic. I'm currently running Memtest86+ on this machine, which is spitting out numerous errors. (16k over 3 passes, and counting) The failing areas are numerous, and look something like this: 0001055da4 - XX.X MB, etc. The addresses that fail seem to cluster around 0-20 MB, 250MB, and, more rarely, 750MB, 1000MB, and 1200MB. However, a lot (but not all) of the failing addresses that I've seen end in XXXXXXX?da4 where the ? is a 1 or a 5. The machine has two sticks of RAM, one 512MB, one 1024 MB, the 512MB mapped to the lower addresses, the 1024 MB stick following. Is this indeed RAM failure, or should I consider other things before purchasing more RAM?

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• Server with 3 Disk, what's the best HD Configuration?

  - by aleroot

  I Have an HP Server with a quad core Opteron and 3 Disk 250Gb S-ATA Disk, i'm thinking about what's the best configuration of the disk for performance and reliability. There is mainly 2 scenario : -RAID 5 with these 3 HD (on the the array 100GB Partition for OS, Other Space for Data Partition) -RAID 1 + 1 Disk for OS (one single Disk OS Installation, RAID 1 Array for a Data Partition) What's the best configuration ? In the Server Run MySQL and Small Document File server, the OS to be installed is Windows Server 2008 ...

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• AppFabric named cache, what happens if you lose a cache host?

  - by Liam

  I'm getting my head around how app fabric clustering works and there's something I'm not sure about. Given a structure where we have one named cache, with two lead hosts and (say) three cache hosts and high availability turned off and the lead host(s) performing the management role. When one cache host goes down do you loose the data that was on that cache host? In this MSDN article it states: Data on the non-lead hosts would be lost (assuming high availability was not enabled), but the rest of the cluster could continue serving and storing data But I was unsure if redundancy is built into the system. Would you loose x amount of data or would one of the other cache hosts store this data also and pick up the slack?

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• Failing to connect; my fault?

  - by Majid

  A client has supplied the following info (fake values used here) for connecting to his host and doing my stuff. I have tried connecting from several locations and failed - the connection times out. Am I doing something wrong, or is he forgetting some crucial info? IP: 216.x.y.z MySql Password : password1 User : user1 Password : password2 SSH Port : 49226 ========== root password : password1 Hostname ; host.com Username ; user2 Password : password3 FTP Port : 201

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• Is there a MAMP equivalent for a stack that uses django-nginx-cassandra?

  - by 828

  I've only ever developed in PHP, MySQL and Apache and wanted to learn some of the new web frameworks and technologies on my own Macbook Pro. MAMP has been great for the LAMP stack and wondering if there are equivalents if I wanted to switch up AMP with one of (or all of) Nginx, Cassandra or Django

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• Multiple subnets behind SonicWall TZ 180

  - by Derek

  We have a SonicWall TZ180 that acts as a VPN endpoint. Right now it has one WAN IP address and a /24 assigned to the LAN interface. Our mail cluster administrator asked if it was possible to add a second private class C behind the VPN. This second subnet would be available to the other network and then we would use address objects and acls to limit access. Is this possible? I read up on PortShield but I don't know if that's what we would need to use because we're pushing all data out of one physical port into a Cisco switch that has VLANs already set up. Addendum: It appears that PortShields will do what I want with only one limitation; it requires a direct 1-1 relationship of portshield to physical port. This would then limit us to 4 PortShields on 1 TZ180. Is there a better solution than this?

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• Is there such a thing as a persistent ram drive?

  - by Linus

  I have a laptop with a LAMP setup. The HDD is slow, which causes my unit tests to run slowly. I was wondering whether I could mount the web root the mysql database on some kind of ramdisk. From what I have read of ramdisks, they are non-persistent. Is there anyway to create a ramdisk that writes changes to an area of the hdd when shutting down and re-mounts the ramdisk on bootup?

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• VNC - Is there any way to turn off logging/log files

  - by Ke

  Hi, I've looked everywhere for a solution to this. Is there any way to turn off this logging in VNC? VNC seems to be logging some large updates I'm doing in mysql and taking up my whole hard drive space. The only way to get rid of the log file is to reboot, which I would prefer not to have to do if possible. Cheers

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• Throttle or limit resources used by a user in a database?

  - by Eduardo

  I would like to know how databases (like MySQL) are able to manage per user resources (like Oracle Database Resource Manager does) to be able to have users that may only get resources only when the database is mostly idle. http://stackoverflow.com/questions/2418581/is-there-a-way-to-throttle-or-limit-resources-used-by-a-user-in-oracle

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• High Steal Time utilization on Apache Linux Server

  - by JMC

  I have a CentOS "development / testing" server that runs extremely slowly. It's running Apache and Mysql using PHP. Top reports that 98% of the CPU utilization is frequently spent on "st" - Steal Time. What could cause a server to spend so much CPU on steal time, and how can I diagnose the problem? I didn't notice the problem until after I granted a third party developer root access (for all I know it has a root kit running, though unlikely).

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• Linux: find out what process is using all the RAM?

  - by Timur

  Before actually asking, just to be clear: yes, I know about disk cache, and no, it is not my case :) Sorry, for this preamble :) I'm using CentOS 5. Every application in the system is swapping heavily, and the system is very slow. When I do free -m, here is what I got: total used free shared buffers cached Mem: 3952 3929 22 0 1 18 -/+ buffers/cache: 3909 42 Swap: 16383 46 16337 So, I actually have only 42 Mb to use! As far as I understand, -/+ buffers/cache actually doesn't count the disk cache, so I indeed only have 42 Mb, right? I thought, I might be wrong, so I tried to switch off the disk caching and it had no effect - the picture remained the same. So, I decided to find out who is using all my RAM, and I used top for that. But, apparently, it reports that no process is using my RAM. The only process in my top is MySQL, but it is using 0.1% of RAM and 400Mb of swap. Same picture when I try to run other services or applications - all go in swap, top shows that MEM is not used (0.1% maximum for any process). top - 15:09:00 up 2:09, 2 users, load average: 0.02, 0.16, 0.11 Tasks: 112 total, 1 running, 111 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 4046868k total, 4001368k used, 45500k free, 748k buffers Swap: 16777208k total, 68840k used, 16708368k free, 16632k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ SWAP COMMAND 3214 ntp 15 0 23412 5044 3916 S 0.0 0.1 0:00.00 17m ntpd 2319 root 5 -10 12648 4460 3184 S 0.0 0.1 0:00.00 8188 iscsid 2168 root RT 0 22120 3692 2848 S 0.0 0.1 0:00.00 17m multipathd 5113 mysql 18 0 474m 2356 856 S 0.0 0.1 0:00.11 472m mysqld 4106 root 34 19 251m 1944 1360 S 0.0 0.0 0:00.11 249m yum-updatesd 4109 root 15 0 90152 1904 1772 S 0.0 0.0 0:00.18 86m sshd 5175 root 15 0 90156 1896 1772 S 0.0 0.0 0:00.02 86m sshd Restart doesn't help, and, by they way is very slow, which I wouldn't normally expect on this machine (4 cores, 4Gb RAM, RAID1). So, with that - I'm pretty sure that this is not a disk cache, who is using the RAM, because normally it should have been reduced and let other processes to use RAM, rather then go to swap. So, finally, the question is - if someone has any ideas how to find out what process is actually using the memory so heavily?

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• PHP file download sometimes

  - by user42092

  Hello all. I have a little problem with my apache centos server with php 5.0 and mysql. When I open multiples files, sometimes, it show de pages .php for download. I think that PHP have a problem, because it happens only when I open many browser windows (like 30). How can I solve this issue?

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• Best ASP.Net Host for Developers

  - by Tyler

  I would need it to allow me to host subdomains and multiple domains is a huge plus. Required: ASP.NET 2.0, 3.0, 3.5 Subdomain Hosting MS-SQL & MySQL Databases Want Multiple Domain Hosting ASP.NET 4.0 Ability to directly connect to MS SQL using SQL SMS So what do you have for me SF?

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• Logging the client IP with Nginx/Varnish/Apache

  - by jetboy

  I have Nginx listening on port 443 as an SSL terminator, and proxying unencrypted traffic to Varnish on the same server. Varnish 3 is handling this traffic, and traffic coming in directly on port 80. All traffic is passed, unencrypted, to Apache instances on other servers in the cluster. The Apache instances use mod_rpaf to replace the logged client IP with the contents of the X-Forwarded-For header. My problem is that if the traffic is coming via Nginx, while the 'correct' client IP is getting logged in the VarnishNCSA logs, it looks as if Varnish is (understandably) replacing Nginx's X-Forwarded-For header with 127.0.0.1 downstream, and this is getting logged with Apache. Is there a nice simple way to stop Varnish rewriting X-Forwarded-For if it's already populated?

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• How can one domain route to an always-changing pool of servers?

  - by ryeguy

  I'm sure this is an easy solution, I'm just not too familiar with how DNS works or if that's even related to this problem. If I'm running a web service on amazon ec2, distributed across many instances, how can I make it so a single domain name can be used to access the entire pool of servers, which will be changing from time to time? Since the instances may be present one second but gone the next (and vice versa), I need a way to randomly pick an active member of the cluster to route to. The updates would have to be instantaneous. Is this even possible, with dns caching and all?

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• Unable to login into CentOS

  - by Rendl

  I had setup a multinode cluster using CentOS with VMware yesterday. Today when I reboot the nodes I get the below error on startup. "there is a problem with the configuration server status 256 centOS" (/usr/libexec/gconf-sanity-check-2 ) I am unable to login as root or any user as the screen is frozen. The solutions online is to change the permissions for some tmp files. My problem is I am unable to access the terminal as I cannot login. Also on reboot I do not have any recovery options in CentOS. I only see command line GRUB. I am new to linux and Hadoop.Pls help asap.

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• No Commands are Working on Mac OS X Terminal?

  - by Raiders

  When I run terminal using the icon on my desktop, I get this error: -bash: export: `:/System/Library/Frameworks/Python.framework/Versions/2.6/bin:/Library/Frameworks/Python.framework/Versions/2.6/bin:/Library/Frameworks/Python.framework/Versions/2.6/bin:/usr/local/mysql/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin': not a valid identifier And subsequently, no commands are working (ls, ssh, sudo, rm, cp and so forth). What is happening???

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• service monitaring manager for Ubuntu ?

  - by mgpyone

  my mate told me that there's a tool to manage services in Ubuntu . System > Administration > Services. but unfortunately, I don't found it in my Ubuntu (9.10). Thus, is it easy to get it ? If not, is there any alternative GUI programs to manage services ( like mysql, apache and so forth) ?

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• mod_pagespeed using up too many resources?

  - by OC2PS

  I have found several threads from 2010 and early-2011 talking about excessive resource usage by mod_pagespeed I haven't seen any recent ones. I am facing excessive memory usage, which is causing server to crash several times a day. I am wondering if the issue was ever fixed before mod_pagespeed 1.0 was released. Also, request any tips and suggestion on how to fix the issue. My server configuration: 4 quad-core processors (likely oversold) 3GB memory Xen Centos 6 64-bit Apache cPanel PHP mySQL

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• JBoss behind NAT hostname problem

  - by z0mbix

  My company has a JBoss cluster sitting behind a firewall that performs NAT. We forward ports to JBoss from the firewall, so that our client application can access the server. We are having trouble when JBoss replies it tells the clients to connect to the internal hostname, not the external one with which the initial connection was made. Is this something that is easily resolved/configured? How are other JBoss app servers configured behind NAT firewalls? Split-horizon DNS? Many Thanks

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• Trace Server Load: Simple "How To"?

  - by Clear.Cache

  My Server Specs: - Centos 4.8 32 bit - Cpanel / WHM - suPHP enabled on PHP 5.3x - MySQL 5x I need someone to please show me various ways to trace what is causing server load spikes. Sometimes I see so many "nobody" users running httpd processes, but I dont' know how to determine what user(s) it might be, even though suPHP is enabled.

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• How can I backup a remote dedicated Server 2008 to my own computer at home?

  - by Nishant

  My server 2008 has mysql databases, SQL Server databases, and multiple websites. How do I back this information up? I have setup the dedicated server to have two 300GB hard drives and they are both mirrored. I want to make sure that I have a backup somewhere else as well. If it's not my home server, I don't mind backing up somewhere else either but I want to make sure I can restore it completely in case of a failure.

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• 403 error with codeignitor

  - by DJB

  When I type in the standard web address for my site, I get a 403 error. However, when I type in a more exact address, say pointing to an index.php file, everything shows up fine. I'm using Anodyne Productions' Nova (SMS 3) which uses codeignitor. All accompanying software (PHP/MySQL) is compatible. I'm not a very technical person, so I'm hoping that this is an easy fix. Thanks for taking the time to answer.

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• AWS Free Usage Tier + Cloudflare... possible?

  - by crashintoty

  If I throw my MySQL/PHP app up on a Amazon EC2 instance (using their AWS Free Usage Tier program) and couple it with CloudFlare (the free plan of course) roughly how many daily visitors can I comfortably handle before performance starts to suffer? Just looking for a rough estimate or educated guess - I understand this setup might be less than ideal but I'm still very curious nonetheless. Thanks in advance

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• A Versatile Physical Server

  - by Paul

  How does one judge potential memory and processor needs for linux web servers? Specifically, given: A Debian or Ubuntu OS Running a web server (apache2), and A database (MySQL), and A DNS server (bind), and Being used by up to 100 concurrent users, at some points each downloading high-resolution (0.5 to 1 MB) images via a web app. How much should one budget in terms of RAM, type of processor(s), and number of cores? Thanks!

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