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• soft lockup - CPU#0 stuck for 11s! error with Xen virtual machines

  - by Arun

  Getting a kernel panic with this error on my XEN VPS's. (all on 8.04 LTS) The kernel version on my Dom-0 is 2.6.24-25-xen and the kernel version on the Xen VPS is also 2.6.24-25-xen. I read something about disabling APIC from here http://muffinresearch.co.uk/archives/2008/08/20/ubuntu-bug-soft-lockup-cpu0-stuck-for-11s/ but that doesn't seem to help as well. Anyone experienced this and are there any workarounds? Thanks in advance!

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• HA Proxy and Disaster Recovery - Only access server if others are down?

  - by ben2004uk

  Why I expect this is not the best way to solve the problem, I got thinking tonight. I'm thinking about geo-locating servers. Given we have a load balancer + two servers to handle traffic in NA (North America) and one server in the EU. If the two US servers die, is it possible to get HAProxy to direct traffic automatically to the EU one. However, I don't want to use a roundrobin approach for the EU - just the two US ones. The EU should only be hit when the other two are down. Does anyone know how to configure HAProxy to do this? Thanks Ben

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• Firefox can't establish a connection to the server at www.google.com

  - by Tom

  My home page in Firefox [v4.0] and Internet Explorer [v9.0.8112.16421, Update Versions RTM (KB982861)] is currently set to Google but when I depress the quick start icon to start up either browser, I am getting the following immediate results: Unable to connect (In Firefox) Firefox can't establish a connection to the server at www.google.com. The site could be temporarily unavailable or too busy. Try again in a few moments. If you are unable to load any pages, check your computer's network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web. Internet Explorer cannot display the webpage What you can try: Diagnose Connection Problems More information This problem can be caused by a variety of issues, including: Internet connectivity has been lost. The website is temporarily unavailable. The Domain Name Server (DNS) is not reachable. The Domain Name Server (DNS) does not have a listing for the website's domain. There might be a typing error in the address. If this is an HTTPS (secure) address, click Tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section. For offline users You can still view subscribed feeds and some recently viewed webpages. To view subscribed feeds: Click the Favorites button , click Feeds, and then click the feed you want to view. To view recently visited webpages (might not work on all pages): Press Alt, click File, and then click Work Offline. Click the Favorites button, click History, and then click the page you want to view. Thankfully, I am able to use one browser that I have installed on my computer (Mathon v3.0.20.5000) to search online for technical assistance in this matter. I have seen several WinSock error issues mentioned; but, they are pointing to Windows XP and I am using Windows 7 Pro and remain uncertain whether anything identified as a fix for one OS will work in another. Things I've tried: HiJackThis Complete scan with Avira AntiVirus Premium. What am I overlooking? What should I do to address this problem?

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• Data capture from other sheet into Summary sheet

  - by Hemant

  an Excel workbook which has Summary sheet, Pending and Master Sheet. My requirement is below and try to develop a Macro or VB logic for excel • I want to control this workbook from Summary sheet. o Generate Fault Summary – ? I have set logic but if doesn’t give warning if sheet name is exists , so need to add this logic . ? When we press the Fault Report Summary command button then it copy the master sheet with cell “A6” Name and will hide the Master sheet. Again when you select the another Month name then it will generate the sheet for that month name. o Generate Toll System Uptime ? When I select the sheet name and “Week” then Press the “Enter “Command button then it should get the result from that sheet number . Each sheet number has Month detail in B2 Cell. ? To calculate the Uptime formula for Week wise is • Week-01 = (1680-SUMIFS(L5:L23,B5:B23,"="&B2,B5:B23,"<="&(B2+6)))/1680 • Week-02 =(1680-SUMIFS(L5:L23,B5:B23,"="&(B2+7),B5:B23,"<="&(B2+13)))/1680 • Week-03 =(1680-SUMIFS(L5:L23,B5:B23,"="&(B2+14),B5:B23,"<="&(B2+20)))/1680 • Week-04 =(1680-SUMIFS(L5:L23,B5:B23,"="&(B2+21),B5:B23,"<="&(B2+27)))/1680 • Month =(1680-SUMIFS(L5:L23,B5:B23,"="&(B2),B5:B23,"<="&(DATE(YEAR(B2),1+MONTH(B2),1)-1)))/1680 ? Result should reflect in Summary sheet at B18 cell . o Pending Fault Report Summary ? When segregate the report on its status like which one is open or Close . It is open then it is Pending Fault Report and when it is Close status it means it is closed. ? If any fault which has OPEN status in all sheets(Jan-13,Feb-13,Mar-13….etc) then it should be come as well as in Pending Sheet which ascending date order. ? When it’s status is changed then it should be moved in that month sheet or nearby fault created date. It status is close then it should not be available in pending sheet as it’s status is Closed. ? Each fault has Reported date and we monitor all fault according reported date. ? When we press the Update Fault Report Summary command button then it should update as above logic. ? Some time we export the Pending fault report , so date calendar should be present in Start and End date to Choose the date. When we press the Export command line then it should export the Pending fault report and able to save in Excel,PDF.

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• Windows 2003 Storage Server Hanging on Large File Transfers

  - by user25272

  In one of our offices we have a Dell PowerVault 745N NAS device which acts as the main file server. Its running 32bit Windows 2003 Storage Server SP2 with 3GB RAM. The server holds around 60 users HOME folders, which are mapped via AD. The office clients are a mix of XP SP3, Vista and Windows 7. Occasionally the server will completely hang when transferring large files. When the hang happens the console becomes unresponsive with only the mouse active and blank wallpaper. Sometimes stopping the copy frees the server, sometimes not. The hanging can last around 20 minutes. During this time other servers also become unresponsive with blank wallpaper at the console. If you do manage to get onto another server the taskbar and run commands are unresponsive. This also transcends to the client computers sometimes with explorer crashing. I'm guessing this is due to the HOME folder mapping. Eventually the NAS server with free up and everything will be back to normal. The server is configured as follows: PERC 4/DC DATA 2 - 12 SCSI HDD - RAID5 SHADOWCOPY 2 SCSI HDD - RAID1 CERC SATA DATA 11 4 SATA HDD - RAID5 OS 4 SATA HDD - RAID5 All the drivers and firmware is up to date. I've been through all the diagnostics with Dell and the hardware has come up clean including full HDD tests on the arrays. The server has NOD32 installed as the AV, but the hanging happens when it is uninstalled. There are no errors in the event log when this happens and we don't have any errors logged on any of our ProCurve switches. DNS is fine on the domain and AD from what I can tell is running happily. There are no DFS or NFS shares setup either. All the shares are standard Windows. I've unchecked the allow the computer to turn off this device to save power box under Power Management on the NIC. "Set Link Speed and Duplex to Auto-negotiate 1000 " Increased Receive Descriptors buffer from 256 to 352 (reserves more CPU resource for handling data) I've run network traces using network monitor and have found the following: 417 8.078125 {SMB:192, NbtSS:25, TCP:24, IPv4:23} 192.168.2.244 192.168.5.35 SMB SMB:R; Nt Create Andx - NT Status: System - Error, Code = (52) STATUS_OBJECT_NAME_NOT_FOUND I've tried different cabling; NICs and switch ports all with the same result. Transferring files from other servers on the domain is fine. All I haven't done is run CHKDSK on the drives to look for any file system errors. On the Vista clients I have also run netsh interface tcp set global autotuning=disabled with no result. Could it be that the server has a faulty drive or that the I/O is too much for it to handle? Any ideas why would the hang cause issues with the other servers on the LAN? Many Thanks.

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• Squid stale-while-revalidate not working when max-age=0

  - by Wiliam

  Squid 2.7 always reaches backend, expected is to reach backend using stale-while-revalidate only when cache expires, not when client triggers max-age=0. Script: <?php header('Cache-Control: public, max-age=10, stale-if-error=200, stale-while-revalidate=500'); header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); sleep(2); die("OK"); And squid config: # http_port public_ip:port accel defaultsite= default hostname, if not provided http_port 80 accel defaultsite=mydomain.com # IP and port of your main application server (or multiple) cache_peer 127.0.0.1 parent 8000 0 no-query allow-miss originserver name=main # Do not tell the world that which squid version we're running httpd_suppress_version_string on # Remove the Caching Control header for upstream servers header_access Cache-Control deny all #header_access Last-Modified deny all # log all incoming traffic in Apache format logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh access_log /usr/local/squid/var/logs/squid.log combined all cache_effective_user squid refresh_pattern . 10080 90% 999999 ignore-no-cache override-expire ignore-private icp_port 0

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• Media center consumes all available memory when attempting to play music off of a server

  - by RCIX

  I have Windows 7 Ultimate, and recently, when i try to play a song off of my Twonky Media Server/Windows Media Connect (based on an HP WHS with an Atom), it plays choppily. When i open Resource Monitor, it shows that after ordering the music to play, memory usage rapidly spikes to consume most, if not all, of the available memory on my system (excluding a couple hundred megabytes in standby). Why does it do this and is there anything i can do to stop it? Edit: it happens when I attempt to browse the server's music, not just when i play music. Edit 2: the "ehshell" process is what consumes the memory, appears to me something specific to media center. Moreover, the ehshell process doesn't die in this case. Edit 3: It only happens when browsing my Twonky library, and not my Windows Media Connect.

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• mosh-like port forwarding

  - by Marc Merlin

  This is on linux, connecting to linux servers: I love mosh, but it doesn't support port forwarding, and likely won't for a while since it's been almost a year now and it hasn't happened yet. port forwarding over ssh is great, but because my laptop moves between networks several times a day, my ssh sessions die, and so do the port forwards. I could script/hack something to detect hung ssh and reconnect to get my port forwards back, but before I do this, is there another way to do long lasting port forwards when your source IP changes several times daily (because you go on different networks)? I'm thinking an ssh over UDP would do the trick but of course ssh is over TCP.

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• How to tune system settings for mongoDB on Linux?

  - by jsh

  Trying to squeeze a lot out of one question here -- please bear with me. Although the MongoDB man pages make several useful recommendations about system settings like ulimit (http://docs.mongodb.org/manual/reference/ulimit/), and other production factors (http://docs.mongodb.org/manual/administration/production-notes/) they seem mysteriously silent on things like virtual memory and swap settings. The closest we get to a hint is that "...the operating system’s virtual memory subsystem manages MongoDB’s memory..." (http://docs.mongodb.org/manual/faq/fundamentals/#does-mongodb-require-a-lot-of-ram). Running the same job - high writes and high reads on about 10,000,000 records in a single collection -- on my 4-processor, 4GB RAM macbook and an 8-core ubuntu box with 64GB RAM I saw dramatically WORSE read performance on the linux box with factory settings, and could hear the disk constantly spinning, indicating high I/O and presumably swapping. Yes, other things were happening on the box, but there was plenty of free RAM, disk space, etc.; furthermore, I did not see evidence that Mongo was expanding to take advantage of all that free RAM as it is touted to do. Linux box default settings were as follows: vm.swappiness =60 vm.dirty_background_ratio = 10 vm.dirty_ratio = 20 vm.dirty_expire_centisecs =3000 vm.dirty_writeback_centisecs=500 I hazarded some guesses looking at docs and blogs for other types of databases (Oracle, MYSQL, etc.), experimented, and adjusted as below. vm.swappiness=10 vm.dirty_background_ratio=5 vm.dirty_ratio=5 vm.dirty_writeback_centisecs=250 vm.dirty_expire_centisecs=500 I saw some immediate apparent improvements in read time. However, when I ran my test jobs again, read performance continued to be painfully sluggish during heavy writes. Then, I REBUILT the collection from an available data source - and suddenly I can read at 1ms or less per record WHILE doing the write job! So the question is really two-fold: 1) What are appropriate VM settings for MongoDB on Linux? 2) (bonus) Does Mongo do some checking or optimization with the OS while data is being built? In other words, if I have built a large data set with suboptimal VM or I/O settings, does Mongo make assumptions during the memory-mapping process that will fail to take advantage of optimizations down the road? Obviously I don't fully grok memory mapping under the hood (I was hoping I wouldn't have to). Any help appreciated...thanks! -j

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• Multiple OS's and GRUB chainloading

  - by Kent

  Hi, I want to have multiple OS installations and I have been advised that chain loading using GRUB is a good way to handle this. I have looked at tutorials on the web but I still have some questions before I can start. I want: Windows XP: 20 GB. For running some school stuff and a game which does not work through WINE. Xubuntu 9.04: 85 GB. My main OS. Another Linux distribution: 15 GB . For experimenting and trying Linux distributions out. I will: Wipe and install various distributions quite often on the 15 Use dd to make a copy of my Windows partition after installing it and getting things to work as I like. My experience is that Windows needs to be re-installed maybe once per year to not get bloated and slow. I have been told: To use GRUB chain loading. It will make it easier when kernel upgrades are made in the Linux distributions, as they modify the GRUB boot-menu. To my understanding I need to: (I might very well be mistaken) Install Windows first. Then install Xubuntu and let it write over the MBR with GRUB (I guess this is the default). Get the GRUB on the MBR start Windows XP if I want to (it's done by default), start Xubuntu using the kernel of my choice or defer execution to the boot sector of my other Linux distribution. The actual chain loading will only occur when I want to start my experimental install of Linux. I wonder: Is step 3 above correct and a good way to handle this? Is it also a good way to use chain-loading for both Xubuntu and my experimental Linux installation? How do I get a Linux distribution to install the boot loader it comes with to the boot sector of its partition and not to the MBR? If I can't get it to not touch the MBR. Then I could make a backup of the MBR using dd and then write it back after installing my experimental Linux installation. But then, how would I get the boot loader (lets say GRUB) into the boot sector of the experimental Linux installation? How would it work if said Linux installation gets a new kernel update and needs to update the GRUB menu?

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• nginx+django serving static files

  - by avalore

  I have followed instruction for setting up django with nginx from the django wiki (https://code.djangoproject.com/wiki/DjangoAndNginx) and have nginx setup as follows (a few name changes to fit my setup). user nginx nginx; worker_processes 2; error_log /var/log/nginx/error_log info; events { worker_connections 1024; use epoll; } http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] ' '"$request" $status $bytes_sent ' '"$http_referer" "$http_user_agent" ' '"$gzip_ratio"'; client_header_timeout 10m; client_body_timeout 10m; send_timeout 10m; connection_pool_size 256; client_header_buffer_size 1k; large_client_header_buffers 4 2k; request_pool_size 4k; gzip on; gzip_min_length 1100; gzip_buffers 4 8k; gzip_types text/plain; output_buffers 1 32k; postpone_output 1460; sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 75 20; ignore_invalid_headers on; index index.html; server { listen 80; server_name localhost; location /static/ { root /srv/static/; } location ~* ^.+\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js|mov) { access_log off; expires 30d; } location / { # host and port to fastcgi server fastcgi_pass 127.0.0.1:8080; fastcgi_param PATH_INFO $fastcgi_script_name; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param QUERY_STRING $query_string; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_pass_header Authorization; fastcgi_intercept_errors off; fastcgi_param REMOTE_ADDR $remote_addr; } access_log /var/log/nginx/localhost.access_log main; error_log /var/log/nginx/localhost.error_log; } } Static files aren't being served (nginx 404). If I look in the access log it seems nginx is looking in /etc/nginx/html/static... rather than /srv/static/ as specified in the config. I've no clue why it's doing this, any help would be hugely appreciated.

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• dig @my-server-ip mydomain.com works from inside, not from outside?

  - by x4954

  My server has 2 ips: x.x.x.73 and x.x.x.248. I can access my site via these ips, using Web browser. {Now, from a CentOS machine (not my server), using terminal} If I: dig @x.x.x.73 mydomain.com dig @x.x.x.248 mydomain.com I get the result: Connection timed out; no server could be reached. Could somebody please tell me how to fix it? Thank you. More information: If I log in to my server using ssh and do: dig @x.x.x.73 mydomain.com dig @x.x.x.248 mydomain.com I can see my zone shown as expected: ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5_7.1 <<>> @x.x.x.73 mydomain.com ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12757 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2 ;; QUESTION SECTION: ;mydomain.com. IN A ;; ANSWER SECTION: mydomain.com. 38400 IN A x.x.x.73 mydomain.com. 38400 IN A x.x.x.248 ;; AUTHORITY SECTION: mydomain.com. 38400 IN NS ns2.mydomain.com. mydomain.com. 38400 IN NS ns1.mydomain.com. ;; ADDITIONAL SECTION: ns1.mydomain.com. 38400 IN A x.x.x.73 ns2.mydomain.com. 38400 IN A x.x.x.248 ;; Query time: 20 msec ;; SERVER: x.x.x.73#53(x.x.x.73) ;; WHEN: Sun Jan 15 11:46:30 2012 ;; MSG SIZE rcvd: 129 BIND version 9.3.6, Centos 5. Logging to my server using ssh, do inga "dig google.com" also shows expected results.

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• Varnish server in front of nginx server with multiple virtualhosts

  - by Garreth 00

  I have tried to search for a solution for this, but can't find any documentation/tips on my specific setup. My setup: Backendserver: ngnix: 2 different websites (2 top domains) in virtualenv, running gunicorn/python/django Backendserver hardware(VPS) 2gb ram, 8 CPU Databaseserver: postgresql - pg_bouncer Backendserver hardware (VPS) 1gb ram, 8 CPU Varnishserver: only running varnish Varnishserver hardware (VPS) 1gb ram, 8 CPU I'm trying to set up a varnish server to handle rare spike in traffic (20 000 unique req/s) The spike happens when a tv program mention one of the sites. What do I need to do, to make the varnish server cache both sites/domains on my backendserver? My /etc/varnish/default.vcl : backend django_backend { .host = "local.backendserver.com"; .port = "8080"; } My /usr/local/nginx/site-avaible/domain1.com upstream gunicorn_domain1 { server unix:/home/<USER>/.virtualenvs/<DOMAIN1>/<APP1>/run/gunicorn.sock fail_timeout=0; } server { listen 80; listen 8080; server_name domain1.com; rewrite ^ http://www.domains.com$request_uri? permanent; } server { listen 80 default_server; listen 8080; client_max_body_size 4G; server_name www.domain1.com; keepalive_timeout 5; # path for static files root /home/<USER>/<APP>-media/; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; if (!-f $request_filename) { proxy_pass http://gunicorn_domain1; break; } } } My /usr/local/nginx/site-avaible/domain2.com upstream gunicorn_domain2 { server unix:/home/<USER>/.virtualenvs/<DOMAIN2>/<APP2>/run/gunicorn.sock fail_timeout=0; } server { listen 80; listen 8080; server_name domain2.com; rewrite ^ http://www.domains.com$request_uri? permanent; } server { listen 80; listen 8080; client_max_body_size 4G; server_name www.domain2.com; keepalive_timeout 5; # path for static files root /home/<USER>/<APP>-media/; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; if (!-f $request_filename) { proxy_pass http://gunicorn_domain2; break; } } } Right now, If I try the Ip of the varnishserver I only get served domain1.com. Would everything be correct if I change the DNS of the two domain to point to the varnishserver, or is there extra setup before it would work? Question 2: Do I need a dedicated server for varnish, or could I just install varnish on my backendserver, or would the server run out of memory quick?

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• Kill ssh background process after disconnect / timeout?

  - by keflavich

  I frequently use ssh tunnels to access VNC sessions on remote machines, but this is on my laptop so the connections break when I put it to sleep for the night. If I then try to re-open the connection in the morning, I have to manually kill the ssh session, otherwise I get this error: bind: Address already in use channel_setup_fwd_listener: cannot listen to port: 1202 Could not request local forwarding. The SSH command I'm using is this: ssh -N -C -f -L 1202:localhost:5900 name@server What's the best way to have the ssh tunnel die when it disconnects? Or reset?

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• Server memory issues, and expected level of service from hosting company

  - by Greg

  I'm involved in maintaining an Ubuntu VPS which runs our django websites (nginx/apache/mod_wsgi) and we've been having some memory spikes which have either caused the database to die, or induced kernel panic when the memory management system can't find any killable processes. I'm working on fixing the memory spikes, but I'm wondering whether there's anything I can do to better deal with the problem if it occurs again. Are there any tools I could use to detect the memory spikes and then, say, kill the offending process and email the server admin to fix it up? Killing off one website so that the server can remain operational is certainly preferable to the whole thing falling over. Also, we were charged $600 for after-hours service because we had to get the hosting company to restart the server - is this standard practice among hosting companies? Another provider I work with provides a panel with which I can stop and start the server myself, and given that a restart was all that was needed, $600 seems mightily excessive. (That's NZD, it's around $445 USD)

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• Apache Tomcat 6.0.29 startup causing Win XP SP3 reboot

  - by Liam

  Some of our Windows XP Developer machines die (black screen - no ping) when starting up Tomcat from a console. This only happens if the Tomcat debug console window is displayed (not minimised). When minimised, the startup / run is successful. I've checked for Tomcat logs and the crash sessions produce empty (zero bytes) tomcat log files. No system logs exist and no crash dump is created even though this is enabled in the Windows settings. The machine is dual screen and another machine with the same image has the same issue. The only clue is just before the crash, one of the monitors the system reports "Cannot display video mode 1280x1024" (approximate error, didn't write it down). Is there a way I can get Windows to produce log files of this crash session? Beyond running Tomcat as a service / minimised window, how can I fix (or even investigate)?

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• Plug and Go NAS Storage

  - by graham.reeds

  My wife and I are separating. One of the things we need to extricate is the media we have accumulated over the years. So I am looking for a NAS solution that is a) relatively low-cost, b) reliable and c) easy for a non-geek to use (I don't want to be tech support). All it needs to do is hold our iTunes library, photos, course work and maybe some movies and TV shows that I currently have. She will be connecting via her Netbook. I have seen this thread but the reviews on Amazon aren't particularly favourable. Due to the need for simplicity, WHS and FreeNAS are none-starters. I need redundancy as if a single drive system was to die then she would lose her course work and photos. Is the ReadyNAS the only real solution out there?

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• login as rsh in rhel 6 without entering password

  - by cartmancakes

  I need to be able to login to a RHEL 6 server using rsh (please don't flame me about security, it's irrelevant in this particular instance) as root without having to enter a password. My procedure for setting this up works great in RHEL 5.x, but does not work in RHEL 6. I suspect this has something to do with PAM, but I'm inexperienced with how to use PAM. Can someone help me with this? /etc/pam.d/rsh auth required pam_rhosts.so auth required pam_nologin.so account include common-account password include common-password session required pam_loginuid.so session include common-session /etc/pam.d/rlogin auth required pam_nologin.so auth [user_unknown=ignore success=ok ignore=ignore auth_err=die default=bad] pam_securetty.so auth sufficient pam_rhosts.so auth include common-auth auth required pam_mail.so account include common-account password include common-password session required pam_loginuid.so session include common-session Thanks!

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• Got Hacked. Want to understand how.

  - by gaoshan88

  Someone has, for the second time, appended a chunk of javascript to a site I help run. This javascript hijacks Google adsense, inserting their own account number, and sticking ads all over. The code is always appended, always in one specific directory (one used by a third party ad program), affects a number of files in a number of directories inside this one ad dir (20 or so) and is inserted at roughly the same overnight time. The adsense account belongs to a Chinese website (located in a town not an hour from where I will be in China next month. Maybe I should go bust heads... kidding, sort of), btw... here is the info on the site: http://serversiders.com/fhr.com.cn So, how could they append text to these files? Is it related to the permissions set on the files (ranging from 755 to 644)? To the webserver user (it's on MediaTemple so it should be secure, yes?)? I mean, if you have a file that has permissions set to 777 I still can't just add code to it at will... how might they be doing this? Here is a sample of the actual code for your viewing pleasure (and as you can see... not much to it. The real trick is how they got it in there): <script type="text/javascript"><!-- google_ad_client = "pub-5465156513898836"; /* 728x90_as */ google_ad_slot = "4840387765"; google_ad_width = 728; google_ad_height = 90; //--> </script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> Since a number of folks have mentioned it, here is what I have checked (and by checked I mean I looked around the time the files were modified for any weirdness and I grepped the files for POST statements and directory traversals: access_log (nothing around the time except normal (i.e. excessive) msn bot traffic) error_log (nothing but the usual file does not exist errors for innocuous looking files) ssl_log (nothing but the usual) messages_log (no FTP access in here except for me)

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• Does 64bit Windows 8 have the same 75% memory-usage limitation for applications as Windows 7?

  - by Barleyman

  64bit Windows 7 (and Windows Vista) have a built-in limit of not being able to use the last 25% of RAM. You will get a low memory warning when you get close to the limit. Even if you disable that warning, applications will run out of memory and crash since the OS will refuse to allocate memory from that last 25%. That was fine when Vista was designed, when machines had 1 GB of total memory, but is pretty daft for today's 8 GB machines. Yes, the system will run cache, etc. on that extra 2 GB, but running out of memory when you have "merely" 2 GB left.... NB: this has nothing to do with the page file. If you limit the page file to a sensible size like 2 GB, you will still see this behavior. The system will cram the page file to the last byte while refusing to touch that 1/4th of the RAM. Does Windows 8 change this behavior? Is there now some fixed minimum free RAM requirement, like 512 MB, or is it still 25%? Can you actually adjust the low memory limit? EDIT: Here is another older post here which discusses this same behavior on Windows 7. There is fixed 25% limit in Windows 7 and I'd like to know if it's still in Windows 8. Windows 7 / Page File Disabled / 12 GB RAM / 2+ GB RAM free and "your computer is running low on memory" Edit2: Here is another link discussing the low memory warning and how to disable it. Note he claims the limit for RAM usage is 80%, not 75%. It would seem to be correct as you can in fact allocate 6.4GB of RAM with 8GB machine. Anything above and beyond that goes to the pagefile, though. http://halflight.com.au/2011/04/06/how-to-disable-low-memory-warnings-and-the-advantages-of-removing-the-page-file/ Edit3: a Here's couple of process explorer screenshots that demonstrate how it goes down. Exhibit1: https://dl.dropbox.com/u/42068601/sysinfo.jpg Exhibit2: https://dl.dropbox.com/u/42068601/sysint2.jpg You can see that Windows 7 will use the memory 6.4GB as the very last resort. I have low memory warning switched off here so programs crashed at the last screenshot allocation. With low memory warning turned on, it starts nagging before you can push OS to use that remaining 1.6GB. The question is not "Is it OK windows does not want to allocate last 20% of RAM because X", it's "Does Windows 8 still behave this way". With 16GB this really becomes dumb.

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• I have been told to accept one error with Memtest86+

  - by DustByte

  Bought a new computer back in August with 4x4 GB RAM. Had problems with the RAM. They sent me four new sticks, which also generated errors. Singled out four sticks (from the eight I now had) that didn't generate any errors. Discovered by coincident a new RAM error last week (this time no BSOD). Contacted the company. According to them there have been issues with a bad stock from last summer so I got two tested 8 GB sticks sent to me. Been running Memtest86+ over the weekend. After 20 hours I got an error (see attached photo). The test has now been running for 37 hours but so far only this one error. I contacted the company where I bought the computer. They wrote back: I wouldn't worry about hat one fail. We have had similar situations here whereby it passes numerous times but then fails once. We think it's an issue with memtest, after all memory is faulty or it isn't so you can't really have it pass a few times, fail the next time around and then pass again! Please trust me on this and continue with the memory we sent you and if your problems continue we'll look at getting it replaced again. I gather from other forum posts that many people do not accept a single error. What could this single error signify, faulty RAM or a glitch in the MEMTEST program (or other)? Update: From the helpful comments below I conclude that an occasional (and rare) "random" error could occur and be acceptable, but repeated errors at the same address would indicate malfunction. Memtest has now run for 45 hours and I still have only one error. For everyone's information, I will keep running the test. In less than two days I am going away for a month. I will most likely leave Memtest running. As I do not have a UPS there is a risk that a power outage will ruin the experiment. The computer is a desktop so I cannot bring it with me (which would curiously have exposed it to more cosmic rays as I will be flying ;)).

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• what to do when ctrl-c can't kill a process?

  - by Dustin Boswell

  Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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• DD-WRT Router Can't hold a connection after initial setup...

  - by AC

  Struggeling with my new DDWRT router (Buffalo WZR-HP-G300NH) configuration. I configured it using one machine while comparing the settings on my existing Linksys WRT54GL on another machine. To the best of my knowledge, I've set it up the same way as my Linksys, but DDWRT has so many other options. After configuring it, I plugged it into the modem, VOIP device & my network. I see the phones come back online. However after a few minutes, it seems I lose the outbound connection (phones die and I can't get out over HTTP). What's confusing me is it works for a few minutes, then it fails. No idea what to look for. Ideas?

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• recommendations for efficient offsite remote backup solution of vm's

  - by senorsmile

  I am looking for recommendations for backing up my current 6 vm's(and soon to grow to up to 20). Currently I am running a two node proxmox cluster(which is a debian base using kvm for virtualization with a custom web front end to administer). I have two nearly identical boxes with amd phenom II x4's and asus motherboards. Each has 4 500 GB sata2 hdd's, 1 for the os and other data for the proxmox install, and 3 using mdadm+drbd+lvm to share the 1.5 TB's of storage between the two machines. I mount lvm images to kvm for all of the virtual machines. I currently have the ability to do live transfer from one machine to the other, typically within seconds(it takes about 2 minutes on the largest vm running win2008 with m$ sql server). I am using proxmox's built-in vzdump utility to take snapshots of the vm's and store those on an external harddrive on the network. I then have jungledisk service (using rackspace) to sync the vzdump folder for remote offsite backup. This is all fine and dandy, but it's not very scalable. For one, the backups themselves can take up to a few hours every night. With jungledisk's block level incremental transfers, the sync only transfers a small portion of the data offsite, but that still takes at least a half an hour. The much better solution would of course be something that allows me to instantly take the difference of two time points (say what was written from 6am to 7am), zip it, then send that difference file to the backup server which would instantly transfer to the remote storage on rackspace. I have looked a little into zfs and it's ability to do send/receive. That coupled with a pipe of the data in bzip or something would seem perfect. However, it seems that implementing a nexenta server with zfs would essentially require at least one or two more dedicated storage servers to serve iSCSI block volumes (via zvol's???) to the proxmox servers. I would prefer to keep the setup as minimal as possible (i.e. NOT having separate storage servers) if at all possible. I have also briefly read about zumastor. It looks like it could also do what I want, but it appears to have halted development in 2008. So, zfs, zumastor or other?

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• centos cron job running php file

  - by user50946

  I have a php file under php called test.php set to run every 5th minute of the hour. When ever I run the file manually (by going to the web browser and runnint the path) it works fine. But when the cron job tries to run it I get the error message my cron job is #### Delete Records 5 * * * * /var/www/html/phpsysinfo/cronUpdateLeadBucketOnEnergycAlliance.php my phpfile is (path : /var/www/html/phpsysinfo/phpfile) <?php require("dbconnect.php"); $sql = mysql_query("DELETE FROM list where status <> 'LEAD'") or die(mysql_error()); ?> and the error that I get is: /var/www/html/phpsysinfo/phpFile.php: line 1: ?php: No such file or directory /var/www/html/phpsysinfo/phpFile.php: line 2: syntax error near unexpected token `"dbconnect.php"' /var/www/html/phpsysinfo/phpFile.php: line 2: `require("dbconnect.php"); thanks

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