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• My Linux desktop sees my HDMI-connected monitor, but my monitor says "No signal"

  - by hrunting

  I have a Gigabyte H55M-UD2H motherboard and an Acer S271HL monitor. When I connect the monitor to the motherboard via VGA, signal works perfectly. When I connect the monitor via HDMI, the system "sees" the connection, but the monitor receives no signal (the monitor shows a blue box which reads "No Signal" and then the monitor goes into power-saving state). Some fun facts about this: if I hook a different monitor to this box via HDMI, the monitor receives the output without issue (same computer/motherboard, same cable, different monitor) if I connect a different computer to the monitor via HDMI, the monitor receives the output without issue (different computer, same cable, same monitor) no signal is received whether in the OS or in the BIOS there are no BIOS options for controlling video output other than for selection of onboard vs. PCI/PCI-E-based video card (the system has no dedicated video card installed) The box is running Linux, so I have the output of xrandr which shows the connection and the monitor modes detected via DDC: ~$ xrandr --prop Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) Broadcast RGB: Full supported: Full Limited 16:2 audio: auto supported: force-dvi off auto on DP1 disconnected (normal left inverted right x axis y axis) Broadcast RGB: Full supported: Full Limited 16:2 audio: auto supported: force-dvi off auto on HDMI2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm EDID: 00ffffffffffff000472ca028d128022 1c160103803c2278ca7b45a4554aa227 0b5054bfef80714f8140818081c08100 9500b300d1c0023a801871382d40582c 450056502100001e000000fd00384c1f 5311000a202020202020000000fc0053 323731484c0a202020202020000000ff 004c55573044303130383531300a01e5 020324f14f0102030405060790111213 1415161f230907078301000067030c00 1000382d023a801871382d40582c4500 56502100001f011d8018711c1620582c 250056502100009f011d007251d01e20 6e28550056502100001e8c0ad08a20e0 2d10103e960056502100001800000000 000000000000000000000000000000de Broadcast RGB: Full supported: Full Limited 16:2 audio: auto supported: force-dvi off auto on 1920x1080 60.0*+ 50.0 25.0 30.0 1680x1050 59.9 1680x945 60.0 1400x1050 74.9 59.9 1600x900 60.0 1280x1024 75.0 60.0 1440x900 75.0 59.9 1280x960 60.0 1366x768 60.0 1360x768 60.0 1280x800 74.9 59.9 1152x864 75.0 1280x768 74.9 60.0 1280x720 50.0 60.0 1440x576 25.0 1024x768 75.1 70.1 60.0 1440x480 30.0 1024x576 60.0 832x624 74.6 800x600 72.2 75.0 60.3 56.2 720x576 50.0 848x480 60.0 720x480 59.9 640x480 72.8 75.0 66.7 60.0 59.9 720x400 70.1 HDMI3 disconnected (normal left inverted right x axis y axis) Broadcast RGB: Full supported: Full Limited 16:2 audio: auto supported: force-dvi off auto on DP2 disconnected (normal left inverted right x axis y axis) Broadcast RGB: Full supported: Full Limited 16:2 audio: auto supported: force-dvi off auto on DP3 disconnected (normal left inverted right x axis y axis) Broadcast RGB: Full supported: Full Limited 16:2 audio: auto supported: force-dvi off auto on How do I get this monitor to recognize the output from this HDMI socket?

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• Installing Tomcat on CentOS 5

  - by andybaird

  Disclaimer: I am not a server admin, I am a windows user that has lead a life of sinful installation wizards and drag and drop I'm attempting to install Tomcat on CentOS 5 hosted by a MediaTemple dedicated virtual server. I basically followed this guide: Installed jpackage and configured the yum.repo.d jpackage file to set enabled=1 Used yum to install java (yum install java) Downloaded the binary distribution of tomcat with "wget http://archive.apache.org/dist/tomcat/tomcat-6/v6.0.14/bin/apache-tomcat-6.0.14.tar.gz" set JAVA_HOME to point at the jdk location I found with "export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/" I gunzip/untar the Tomcat files and run ./startup.sh to start the Tomcat server. That is supposed to put the Tomcat server at myserver.com:8080 - however, I just get a could not contact host error when I try to browse to it (or when I try 'curl localhost:8080' from SSH) After I type ./startup.sh, here is the console output: [root@myserver bin]# ./startup.sh Using CATALINA_BASE: /root/apache-tomcat-6.0.14 Using CATALINA_HOME: /root/apache-tomcat-6.0.14 Using CATALINA_TMPDIR: /root/apache-tomcat-6.0.14/temp Using JRE_HOME: /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/ [root@myserver bin]# Is there a step I have missed here? Edit: I've now discovered by looking at the log the following error is occuring: Error occurred during initialization of VM Could not reserve enough space for object heap

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• online backup plan for a home office with servers

  - by TiernanO

  So, i am in the process of tweaking my spending and i need to change my backup plan... I am currently using a mix of JungleDisk and ZManda ZCB to backup files on my MacBook Pro, Main Windows Server Wrokstation, a dedicated Windows Server in a datacenter, and various other machines and file sources. The problem is the cost: this month, it has cost me about $90 to backup a little over 500Gb... This amount of data will increese over time too, since i am backing up Photos (24Mb RAW images + 4-8MB JPEGs), Videos (various cameras shooting 720p and 1080p), Music, Movies, TV shows and Apps from iTunes (though with iTunes cloud, this might not need to be backed up again) and source code... I have looked at the likes of Mozy, CrashPlan+ and Pro, Backblaze and Carbonite, but each have their problems: Mozy seems overly expenvice per gig at 50C Crashplan wont sell to me since i am outside the US (they hide it on their site... hidden in the FAQ section!) Backblaze dont support Windows Server Carbonite business pricing is $600 up front for 500Gb of storage... Fro $229, they will not backup Windows Servers. So, other than those, Jungle Disk (at 15c per Gig) or ZManda (also at 15c per Gig) what other options are there? what are other people using?

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• How to configure VirtualBox server for performance at home

  - by BluJai

  I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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• Trouble installing SSL Certificate on Apache

  - by jahufar

  We have a dedicated server with GoDaddy running Plesk that requires SSL. I've generated the certificate files and I created a vhost_ssl.conf (since I can't edit the default plesk apache configuration http.include, vhost_ssl.conf gets Included to httpd.include) that tells apache where to find the certificate files: SSLCertificateFile /usr/local/psa/var/certificates/domain.com.crt SSLCertificateKeyFile /usr/local/psa/var/certificates/domain.com.key SSLCertificateChainFile /usr/local/psa/var/certificates/sub.class1.server.ca.pem When I stop/start apache, it refuses to start up. The error_log does not have anything on it either (which is strange). Then I opened up httpd.include and found this bit: <VirtualHost 208.xxx.xxx.xxx:443> ServerName domain.com:443 ServerAlias www.domain.com UseCanonicalName Off SSLEngine on SSLVerifyClient none SSLCertificateFile /usr/local/psa/var/certificates/certagC9054 Include /var/www/vhosts/domain.com/conf/vhost_ssl.conf Then I commented out SSLCertificateFile /usr/local/psa/var/certificates/certagC9054 (which is plesk's SSL certificate) and restarted apache and it worked perfectly fine. It seems that Apache does not like multiple SSLCertificateFile within the same VirtualHost directive? As anyone who worked with plesk knows, I can't just remove SSLCertificateFile directive in httpd.include as plesk will overwrite my changes when someone uses it - which is why it's in vhost_ssl.conf. So I'm stuck and this is beyond my meager admin skills. Would appreciate someone who knows what (s)he's doing to tell me whats going on. Thanks in advance.

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• Backup hardware and strategy on distributed Windows Server 2008 network

  - by CesarGon

  This question is a follow up to this. We have a Windows Server 2008 R2 domain over a network that spans two different buildings, linked by a 100-Mbps point-to-point line. Over 60 users work in the organisation. We are planning to use DFS folders and DFS replication for file serving across the organisation. The estimated data volume is over 2 TB, and will grow at approximately 20% annually. The idea is to set up a DFS file server in each building and use DFS so that all the contents stay replicated over the 100-Mbps link. We are now considering backup hardware and strategies. We are Dell customers and, after browsing the online Dell catalogue, I can see a number of backup hardware options. My main doubts are the following: Would you go for a tape library, disk backup, or are there other options worth considering? Would you perform batch backups (i.e. nightly) or would you use continuous backup (i.e. while users are working)? Would you use a dedicated backup server to which the tape library (or any other backup device) is attached, or is there any other alternative way of doing things? My experience with backup hardware and overall setup is limited, so I appreciate any good piece of advice that you may have. Thanks.

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• Static noise in headphones

  - by John Murdoch

  I have a Asus P6T based system. I was using the on-board sound (plugging in Logitech X-230 2.1 analog speakers in the green "front speakers" 3.5mm analog output, then plugging in my headphones in that). I was quite happy with the sound quality (didn't hear any static noise if volume was turned down to my normal listening level). Then about a week ago I started having terrible static noise from the left channel, and no normal audio on that left channel. Right channel had more static noise than usual but did have a bit of sound. I tried using the AC'97 in front of my case but that seemed to have no signal. I decided my on-board sound card has gone bad and bought an internal sound card to replace it (Startech 7.1Ch PCI). This fixed the "no sound from left channel problem", but I had much more audible static noise. I decided the card was low quality and/or it had interference from all the other things happening inside the computer case, and bought a Sweex SC016 external USB sound card. But even with that I have static noise in headphones. Positioning the USB sound card differently doesn't seem to help. Trying the other analog outputs (e.g., surround) doesn't help. The static noise in all cases is proportional to the volume. I have tried different headphones, but the situation is situation though perhaps the flavour of the static noise changes slightly. So what are my options? a) Get another, more expensive, external USB sound card hoping the quality will improve? b) Get another, more expensive, internal sound card (PCIe 1x perhaps) hoping the quality will improve? c) Get a dedicated DAC box? d) Get some Hi-Fi earphones? Suggestions? tl;dr - Two different sound cards both still have static noise in headphones.

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• How do you setup FTP with IIS Manager Users in an NLB environment with shared IIS configs?

  - by William Jens

  I've setup a 2 node NLB cluster and used the following to share IIS configs between them. http://blogs.technet.com/b/meamcs/archive/2012/05/30/configuring-iis-7-5-shared-configuration.aspx The IIS configs and content is located on a network share via a UNC path. This works - updating IIS settings on one node, is visible in another node and my website works on the individual nodes and the cluster as whole. I'm able to setup an FTP site and successfully connect with my Windows login. However, I want to use IIS Manager Authentication as defined in: http://www.iis.net/learn/publish/using-the-ftp-service/configure-ftp-with-iis-manager-authentication-in-iis-7 I've tried using "Network Service" with the FTP COM object as well as a dedicated user account that exists on all three hosts, but every time I try to login with an IIS user I get something like the following: IISWMSVC_AUTHENTICATION_UNABLE_TO_READ_CONFIG An unexpected error occurred while retrieving the authentication information. Exception:System.Runtime.InteropServices.COMException (0x8007052E): Filename: Error: at Microsoft.Web.Administration.Interop.AppHostWritableAdminManager.GetAdminSection(String bstrSectionName, String bstrSectionPath) at Microsoft.Web.Administration.Configuration.GetSectionInternal(ConfigurationSection section, String sectionPath, String locationPath) at Microsoft.Web.Management.Server.ConfigurationAuthenticationProvider.GetSection(ServerManager serverManager) Process:dllhost User=NT AUTHORITY\NETWORK SERVICE Can anyone point me in the right direction here?

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• Migrating 10-15 Websites Running Linux, LAMP, RoR, WordPress

  - by Michael

  Task is to move 10-15 websites running Linux to new servers hosted by Amazon. These boxes are currently on dedicated servers. Some sites are running WordPress, some have custom CMS, and others might have RoR applications. Unfortunately, there is sparse documentation regarding each site and how services/files are dependent on each other which means there is a lot of detective work that needs to take place. My goal is to properly document each site, what makes them work, etc., so future admins have at least something to work with. Currently my strategy is to download each site so I have a backup of the files then scan through them looking for configuration files -- db connections, apache configs, etc. Then, create a nice spreadsheet with these findings and migrate these out to the new server. My question to ServerFault is this, are there things you would look out for? Easier ways to handle this task that I'm missing? Points will be awarded to answers that help with efficiency. Thanks in advance.

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• Bad network performance on KVM guest

  - by Devator

  I have a dedicated server connected to a 1000 Mbit port. However, the Debian guest is only getting half to a 1/4 the speeds: On the node itself (Linux node 2.6.32-279.9.1.el6.x86_64 #1 SMP Tue Sep 25 21:43:11 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux): wget http://www.bbned.nl/scripts/speedtest/download/file1000mb.bin -O /dev/null --2012-11-11 23:10:11-- http://www.bbned.nl/scripts/speedtest/download/file1000mb.bin Resolving www.bbned.nl... 62.177.144.181 Connecting to www.bbned.nl|62.177.144.181|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 1048576000 (1000M) [application/octet-stream] Saving to: â/dev/nullâ 100%[====================================>] 1,048,576,000 100M/s in 10s 2012-11-11 23:10:21 (100 MB/s) - â/dev/nullâ On the guest (Debian 6.0.5, x64: Linux debian 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux): wget http://www.bbned.nl/scripts/speedtest/download/file1000mb.bin -O /dev/null --2012-11-11 23:10:41-- http://www.bbned.nl/scripts/speedtest/download/file1000mb.bin Resolving www.bbned.nl... 62.177.144.181 Connecting to www.bbned.nl|62.177.144.181|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 1048576000 (1000M) [application/octet-stream] Saving to: â/dev/nullâ 100%[=================================================================================================================================================================================================>] 1,048,576,000 16.5M/s in 42s 2012-11-11 23:11:23 (23.8 MB/s) - â/dev/nullâ I use the virtio NIC. I tried some more NICs: e1000 and the Realtek 8139 but those yield even worse results. Anyone has an idea how to improve these speeds?

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• Virtual machines interconnection inside Proxmox 2.1 Cluster

  - by Anton

  We have 3 physical servers (each with 1 NIC) in different datacentres, all of them are interconnected by openvpn bridged private network (10.x.x.x). Inside this network we have fully functional 3 nodes Proxmox 2.1 cluster. So, actually question is: Is there any "proper" way to make "global" local network (172.16.x.x) for all VMs inside cluster, so even if we move VM from one node to other we could reach it by static IP regardless of it's physical location? BTW, we can't add dedicated NIC to each server. Thanks in advance. EDIT: I have tried to make a separate openvpn bridge for 172.16.x.x, now I have at each server two interfaces: SRV1: openvpnbr1 - 172.16.13.1 vmbr0 - 172.16.1.1 SRV2: openvpnbr1 - 172.16.13.2 vmbr0 - 172.16.2.1 But now there is no connection between those ifaces: SRV1: ping 172.16.13.2 From 172.16.1.1 icmp_seq=2 Destination Host Unreachable SRV2: ping 172.16.13.1 From 172.16.2.1 icmp_seq=2 Destination Host Unreachable If I shut down vmbr0 interfaces, so there is connection between servers over openvpn, but vmbr0 is used by Proxmox... Where I am wrong?

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• Installing Trac on Windows under Apache 2.2?

  - by Warren P

  Trac is a python-powered bug-tracking and project-management app. According to Trac's wiki, there are several options for installing Trac, a standalone server (tracd), or under a dedicated webserver using one of these options: FastCGI - Not available on windows. mod_wsgi - No version of mod_wsgi available for Apache 2.2.22 and Python 2.7.3-amd64 that actually runs on my system! mod_python - no longer recommended, as mod_python is not actively maintained anymore) CGI -should not be used, as the performance is far from optimal) That leaves me with zero ways to run Trac on Windows. Apache 2.2.22 with ModWSGI loading, crashes the Apache2.2 service on startup without any error logs. Disabling the line in the apache configuration to load mod_wsgi restores sanity. I just want an installation of Trac on windows with Authentication enabled. I am unable to get authenetication to work using basic tracd like this: tracd -p 8000 --basic-auth="c:\tmp,c:\tmp\Passwords.md5.txt,mycompany" c:\tmp\RootFolder And I am unable to get Mod_WSGI installed. I'm going to keep trying to figure out a combination that works, I suspect I should have installed 32 bit python instead of 64 bit python, to start with. Did I do wrong to install Python 64 bit 2.7.3? I tried again with all 32 bit components, and still can't get MOD_WSGI to work with apache 2.2.22. I'm going to try to compile mod_wsgi myself with Visual C++ Express 2010, but it seems to me that it ought to be easier than this to get Trac running on windows, with authentication. Is there a way to run Trac on Windows, under Apache, with authentication? The last "Trac on windows" article died in 2008, leaving only this internet archive link for "Trac on windows" setup.

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• How can adding a server to a domain cause Remote Desktop to stop working?

  - by Adrian Grigore

  I have two dedicated with Windows 2008 R2 servers which I am using for Web hosting. One Server A is a domain controller, Server B should simply be added to the domain controlled by Server A. So I RDP'd into Server B and changed the system settings so that Server B is part of that domain. I entered my domain admin credentials, was welcomed to the domain and asked to reboot the server. So far everything seemed to work smoothly After rebooting, I could not open an RDP connection to Server B anymore: Remote Desktop can’t connect to the remote computer for one of these reasons: 1) Remote access to the server is not enabled 2) The remote computer is turned off 3) The remote computer is not available on the network Make sure the remote computer is turned on and connected to the network, and that remote access is enabled. I restored an older backup of Server B and switched off the firewall before adding the server to my domain. But the problem reoccurred just the same. What could be the reason for this? The domain is brandnew and I did not change any of the default settings. Could this be some kind of domain-wide default policy that shuts down RDP on any domain clients? Or perhaps it has to do with the fact that Server B is virtual? Thanks for your help, Adrian

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• Programmer configuring a new network

  - by David Lively

  I'm in the process of expanding my home network from a couple of laptops on a wireless Verizon FiOS router to include: Linksys 24-port switch Cisco Pix 515 Cisco 3640 router One new development desktop and three new machines to act as a db server, web server and a backup system. My company is moving offices and we've decommissioned some older hardware, which I was able to pick up for the cost of the labor to move it home from the office. The benefits to working with dedicated web and db servers are very valuable to me. I know very little about network topology, other than that everything plugs into the switch, which then plugs into the cheap Verizon router. (Verizon provides a coax connection that the router must translate into Ethernet before I can use it with any of this equipment). Questions: What is the recommended topology for this equipment? Verizon router - Pix - 3600 - switch? Is the 3600 even necessary or desirable? The Verizon router has one WAN port and 4 client ports, all 10/100. Is there any performance benefit at all to wiring multiple connections from the verizon router to the switch, assuming I don't use the Pix? Should I use the Pix? Software firewalls are a pain, and seem silly if I have a device like this lying around. Anything else I should know? Am I wasting my time with this? I also obtained a 7 foot rack, shelves, patch panels, UPS, patch panels, etc, which are going into a conveniently air conditioned closet. All constructive advice appreciated.

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• Recommendations for colocation in the US

  - by Emil

  Hello serverfault I work for a European media company and we are currently looking for colocation in the US. I know the European market quite well unfortunately that is not the case for the US. I'm hoping for you guys to help me out a bit with a few questions, it would be much appreciated! I am looking for a data center that can deliver a high level of availability (tier 3 or better). The installation will be fairly large so capacity is important. Good internet connectivity/carrier presence. However most important is good customer support, skilled dedicated and responsive technical staff, since we won't have tech staff close by. I'm looking for a small and fast moving company that target internet businesses rather than big old enterprise hosting. What locations should we go for given that we want to reach all of the US from a single site and still maintain decent latency? (do we need east and west coast?) Where are the main internet hubs and should you try and get as close as possible? Are there any good online resources I should look at? Where do the large scale internet/media services colocate? Lastly I would be very happy to get some actual recommendations for companies to talk to P.S I'm happy to return the favor if anyone has question regarding data centers and colocation in Europe.

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• Getting 502 instead of 503 when all backend servers are down running HAProxy behind Apache

  - by scarba05

  I'm testing running HAProxy as a dedicated load balancer behind Apache 2.2, replacing our current configuration where we use Apache's load balancer. In our current, Apache only, set-up if all the backend (origin) servers are down Apache will serve a 503 service unavailable message. With HAProxy I get a 502 bad gateway response. I'm using a simple reverse proxy rewrite rule in Apache RewriteRule ^/(.*) http://127.0.0.1:8000/$1 [last,proxy] In HAProxy I have the following (running in default tcp mode) defaults log global option tcp-smart-accept timeout connect 7s timeout client 60s timeout queue 120s timeout server 60s listen my_server 127.0.0.1:8000 balance leastconn server backend1 127.0.0.1:8001 check observe layer4 maxconn 2 server backend1 127.0.0.1:8001 check observe layer4 maxconn 2 Testing connecting directly to the load balancer when the backend servers are down: [root@dev ~]# wget http://127.0.0.1:8000/ test.html --2012-05-28 11:45:28-- http://127.0.0.1:8000/ Connecting to 127.0.0.1:8000... connected. HTTP request sent, awaiting response... No data received. So presumably this is down to the fact that HAProxy accepts the connection and then closes it.

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• Concerns about Apache per-Vhost logging setup

  - by etienne

  I'm both senior developer and sysadmin in my company, so i'm trying to deal with the needs of both activities. I've set up our apache box, wich deals with 30-50 domains atm (and hopefully will grow larger) and hosts both production and development sites, with this directory structure: domains/ domains/domain.ext/ #FTPS chroot for user domain.ext domains/domain.ext/public #the DocumentRoot of http://domain.ext domains/domain.ext/logs domains/domain.ext/subdomains/sub.domain.ext domains/domain.ext/subdomains/sub.domain.ext/public #DocumentRoot of http://sub.domain.ext Each domain.ext Vhost runs with his dedicated user and group via mpm-itk, umask being 027, and the logs are stored via a piped sudo command, like this: ErrorLog "| /usr/bin/sudo -u nobody -g domain.ext tee -a domains/domain.ext/logs/sub.domain.ext_error.log" CustomLog "| /usr/bin/sudo -u nobody -g domain.ext tee -a domains/domain.ext/logs/sub.domain.ext_access.log" combined Now, i've read a lot about not letting the logs out of a very restricted directory, but the developers often need to give a quick look to a particular subdomain error log, and i don't really want to give them admin rights to look into /var/logs. Having them available into the ftp account is REALLY handy during development stages. Do you think this setup is viable and safe enough? To me it is apparently looking good, but i'm concerned about 3 security issues: -is the sudo pipe enough to deal with symlink exploits? Any catches i'm missing? -log dos: logs are in the same partition of all domains. got hundreds of gigs, but still, if one get disk-space dos'd, everything will break. Any workaround? Will a short timed logrotate suffice? -file descriptors limits: AFAIK the default limit for Apache on Ubuntu Server is currently 8192, which should be plenty enough to handle 2 log files per subdomain. Is it? Am i missing something? I hope to read some thoughts on the matter!

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• Kernel Logging disabled?

  - by Tiffany Walker

  uname -a Linux host 2.6.32-279.9.1.el6.i686 #1 SMP Tue Sep 25 20:26:47 UTC 2012 i686 i686 i386 GNU/Linux And start ups: ls /etc/init.d/ abrt-ccpp certmonger dovecot irqbalance matahari-broker mdmonitor nfs proftpd rpcbind single ypbind abrtd cgconfig functions kdump matahari-host messagebus nfslock psacct rpcgssd smartd abrt-oops cgred haldaemon killall matahari-network mysqld ntpd qpidd rpcidmapd sshd acpid cpuspeed halt ktune matahari-rpc named ntpdate quota_nld rpcsvcgssd sssd atd crond httpd lfd ma tahari-service netconsole oddjobd rdisc rsyslog sysstat auditd csf ip6tables lvm2-lvmetad matahari-sysconfig netfs portreserve restorecond sandbox tuned autofs cups iptables lvm2-monitor matahari-sysconfig-console network postfix rngd saslauthd udev-post But when I installed CSF/LFD I am getting nothing. LFD does not create lfd.log and nor are any blocks being logged in /var/log/messages either from the firewall. This is not natural. I looked for klogd but maybe I am looking in the wrong place for it to see if it is enabled? ls /etc/init.d/syslog ls: cannot access /etc/init.d/syslog: No such file or directory Also noticed no syslog? Also noticed this: csf -d 84.113.21.201 Adding 84.113.21.201 to csf.deny and iptables DROP... iptables: No chain/target/match by that name. iptables: No chain/target/match by that name. I've never seen this before and this is a dedicated box. Also: ./csftest.pl Testing ip_tables/iptable_filter...OK Testing ipt_LOG...OK Testing ipt_multiport/xt_multiport...OK Testing ipt_REJECT...OK Testing ipt_state/xt_state...OK Testing ipt_limit/xt_limit...OK Testing ipt_recent...OK Testing xt_connlimit...OK Testing ipt_owner/xt_owner...OK Testing iptable_nat/ipt_REDIRECT...OK Testing iptable_nat/ipt_DNAT...OK RESULT: csf should function on this server iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination

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• After update to Windows 8.1 brigthness isn't working (changing)

  - by Bibo

  I just update my Windows 8 to Windows 8.1 by Windows Store and I have some problems. My notebook is Acer Aspire Timelinex 3820TG and I know it's little old for Windows 8 but I install them and works fine (I updated my HDD to SSD). Now I just updated Windows and I have problem with changing brightness on my dedicated graphic card (Ati HD 5650). First I can changing brigthness with fn + keys but It just changing level in OS. No change in real. I tried reinstall drivers, install drivers for my card from Acer with compatibility to Windows 7 and without change. When I switch to integrated card changing brightness works. I think the problem is with drivers but I don't know how to get it working. Thanks for help Bonus question: I have another problem (but this one is not so important). Does anyone knows what msietxghh.exe is doing? Everytime when my system runs (after update) I get message that this program stops working but I just cancel and looks everything works fine.

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• SQL 2008 SP1 crashing almost daily

  - by matijake

  Hey, almost every day our new DB crashes. It is virtual server residing on same hardware as 5 other servers, two of them beeing identical MS SQL2008sp1 and two Oracle 11g's so I can pretty much rule out hardware issues. Server has dedicated local LUN, 4vCPU and 8GB memory with 2GB windows swap file. It runs 4 instances. Primary instance is limited to 5GB memory and paralelism set to 4 running on MS SQL 2008 SP1 @ Windows Server 2008 Enterprise R2 x64. Only that primary instance is crashing. After it crashes nothing can connect to it, it's even impossible to shut it down through service manager. What I found in logs is: ***Stack Dump being sent to C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\LOG\SQLDump0081.txt SqlDumpExceptionHandler: Process 4788 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server i s terminating this process.     Whole log can be seen at: http://kabl.org/files/SQLDump0081.txt second crash log made second later at: http://kabl.org/files/SQLDump0082.txt I have analyzed mini crashdump with Microsoft tools, but no promising results. If it can help, here it is: http://kabl.org/files/SQLDump0081.mdmp Any ideas are greatly welcome, since it is becoming quite a pain in the ass to restart server almost every day :) Regrads, -Matija

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• Xen 4.1.2 unable to boot

  - by Devator

  I have installed Xen 3.1.2 perfectly, and it's running fine. However since that version is way outdated I just updated it to 4.1.2 by adding the gitco repository and then yum update. It installed fine, modified my grub.conf to reflect the changes but then on a reboot, it simply doesn't come back online (I can't see what's going on, as it's a rented dedicated server). What are my options? Booting into rescue mode and using the older kernel works fine, it will come back up. But once I use the xen.gz-4.1.2kernel, it won't come back up anymore and I need to use the rescue image.. My /boot/grub/grub.confis as follows: title CentOS (2.6.18-308.1.1.el5xen) root (hd0,1) #kernel /xen.gz-2.6.18-308.1.1.el5 dom0_mem=1024M kernel /xen.gz-4.1.2 module /vmlinuz-2.6.18-308.1.1.el5xen ro root=/dev/md1 module /initrd-2.6.18-308.1.1.el5xen.img When I uncomment the 3.1.2 kernel, it works fine, but booting with the 4.1.2 kernel fails and I have no idea what's going on. Hence my question: what are my options?

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• Hosting websites in our Workplace custom-built datacentre

  - by i.h4d35

  I'm faced with unique learning opportunity at work at the moment. Due to the slowdown (amongst other reasons), the powers that be at my office have decided to abandon our shared hosting providers (both shared and dedicated hosting) and have decided to host the websites at our office's datacentre. We're running 7 websites, wherein the average unique hits per day at the moment is about 900. We have 2 servers set aside for this - one is a DELL POWER EDGE 1850 (Intel Xeon 3 GHZ*2, 4GB RAM, 73GB HDD and the other is an HP DL 380 G3 (Intel Xeon 2.8 GHz, 6 GB RAM, 73 GB HDD) a) I would like to know the pros and cons of going ahead with this project.All the sites will be hosted on a single IP. In all probability, the OS is going to be CentOS. b) Do you think I should consider Virtualization into this equation (KVM/Xen)? I was thinking in terms of separate instances of the DB server and the frontend though I do not know if this is the best way to go. c) Should I be trying to use cloud stacks like OpenStack and try to make it look like websites hosted on some sort of Public Cloud? (something that I checked out here). Here is something else I came across, which looks similar to what needs to be done at our office. About the websites - Of the 7 websites, 4 are basic static websites which basically gives a whole lot of information about a few local institutions. The remaining 3 are local product-based websites developed in PHP wherein end user can view products and order them online. I am trying to take this as a learning experience wherein I can learn to build something from scratch and save the company a little something in the process. The migration needs to be completed by Easter so I guess it gives us some time (or am I being overly optimistic??). I am confused here and would appreciate all the help I can get. Thanks in advance.

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• Suspected brute force attack

  - by HarveySaayman

  Recently I acquired a dedicated server from a local ISP to play around with. As the tags suggest, its a windows server 2008 R2 machine. I've only had it for a few days, and no real traffic is going to it yet. I haven't even deployed a "real" website to it yet. Just a silly page so that I could check IIS, my host headers, DNS records, etc are all configured correctly. While playing around, I noticed a ton of Audit Failure entries in the event viewers security logs. It seems something is trying to access the administrator account, and failing. It smells like a brute force attack to me. My ISP gave me the account details of the administrator account and I used those to RDP into the box, which I've heard is not the securest of situations. I created myself another account and added myself to the administrator group, so im using that account to gain acceess to the machine now. In response to all of this i used http://strongpasswordgenerator.com/ to generate me some 20 character length strong passwords and changed all of my account passwords, even the SQL sa user. I also enabled the auto ban feature of FileZillaServer (my FTP server) My questions: 1) how can i detect this kind of thing better? 2) how can i protect my server from unauthorized access better? PS: I'm a software dev, not a sysadmin so please mind my server security idiot-ness-ness

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• Apache crashes every 5min

  - by Simon

  I'm relatively new to server issues, having a site of mine that I started early in the year grow beyond my capabilities of managing it. I need help. I recently moved out of my shared hosting environment onto a dedicated virtual server from Mediatemple. Each week, I run a script that fetches data from my DB, fetches data from last.fm's API and then tweets information to Twitter. My server uses Virtuozzo and when the script runs, Apache crashes every 5min. I checked and saw that the 'kmemsize' parameter reaches its cap (its 13mb). I realise my problem. The MySQL process stays open for long while Apache needs to handle lots of incoming links (about 200 000 pageviews for that day according to my previous host's AWSTATS). Yes, I'm quite unexperienced in this, and I'm clearly killing the server with too many incoming links while it has to manage the updating of the DB. So that is the precedent: I want a few answers. 1) Why did my shared hosting environment not crash apache every 5min? It ran fine, the site only slowed a lot. Clearly, it must be the virtual container and the kmemsize limit? 2) Where do I go from here? Would a physical server (not a virtual container) encounter the same problems? I sent a support request to Mediatemple as well. I need all the help I can get.

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• Allowing XP Home Clients To Access Active Directory Printers

  - by Sean M

  My school's network is based on Active Directory on Windows Server 2003 servers. Most of the computers in the school are members of the domain. However, we also acquired a passel of netbooks that are running Windows XP Home (as netbooks tend to), and we're trying to make those useful. The netbooks are made available to students by check-out, so none of them are dedicated to a specific user. I only want to allow the netbooks to do two significant network activities: to access the Internet (this is working acceptably well so far), and to print to one or more printers on the network. That second one is where trouble starts. I'm trying to find a way to allow the XP Home clients to access those Active Directory printers. All the solutions that I can come up with right now are expensive, ugly, or both - for example, changing the OS on the netbooks (even with imaging, that would take a lot of my time) or making sure that the user account on each netbook has a matching account in Active Directory with permissions for printing (invites security/maintainability disaster). Are there any elegant solutions? Failing that, what's the best ugly solution for allowing my students to print from the netbooks?

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