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• Unable to connect via NetBIOS Name

  - by grom

  I can't connect to machines/shares by NetBIOS names. Below is console output showing the problem. C:\>nbtstat -n Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] NetBIOS Local Name Table Name Type Status --------------------------------------------- BEAST <00> UNIQUE Registered WORKGROUP <00> GROUP Registered BEAST <20> UNIQUE Registered WORKGROUP <1E> GROUP Registered WORKGROUP <1D> UNIQUE Registered ..__MSBROWSE__.<01> GROUP Registered C:\>nbtstat -A 192.168.1.3 Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- BRCLAPTOP <00> UNIQUE Registered WORKGROUP <00> GROUP Registered BRCLAPTOP <20> UNIQUE Registered WORKGROUP <1E> GROUP Registered MAC Address = 00-1C-BF-14-B8-6E C:\>ping beast Pinging beast [fe80::59b8:179f:b90b:a63f%11] with 32 bytes of data: Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Ping statistics for fe80::59b8:179f:b90b:a63f%11: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\>ping brclaptop Ping request could not find host brclaptop. Please check the name and try again. C:\>nbtstat -a brclaptop Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] Host not found.

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• My bios datetime is resetting to 2002, what should I do?

  - by Thierry Lam

  I bought my PC brand new in mid-2006. I'm currently dual booting Win XP 32 bits and Ubuntu Karmic Desktop. Over the last few days, when I boot up my computer, it tells me that my bios time is not set. I now have 2 choices for booting in: Windows first: I can safely get into Windows but the date now shows 2002/01/01 at 00:00. From there, Windows will not sync its time to its servers, I have to manually advance the date myself. I can also advance the date from the bios at startup. Ubuntu first: Since the time date is still set at 2002, the boot system cannot find my linux partition. I can fix that issue by booting to Windows, set the date properly and the linux issue will be fixed automatically. The above two issues can also be fixed if I manually set the bios date/time manually when I turn on my computer. It's annoying to do that every single day since I shut down my PC daily. Am I having an OS issue or a hardware issue? How can I resolve this problem?

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• Not able to access Silverlight.net and ONLY Silverlight.net - All other domains work!

  - by Sootah

  Alrighty folks, I have an extremely odd problem. I am able to surf the web fine with one odd (and really annoying at the moment) exception: Microsoft's Silverlight.net. Every other site that I go to works just fine. This is quite frustrating because I'm in the middle of programming a web app in Silverlight 4.0, and whenever I do a search for any code examples, tutorials, or whatnot at least 50% of the results are hosted in the silverlight.net forums. The error message that I get is: Oops! Google Chrome could not find www.silverlight.net It doesn't work in my other browsers either (both IE and FireFox). What's odd, is that while the error message would lead me to assume it's a DNS error, I can ping the URL just fine. C:\Users\The Doot>ping silverlight.net Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Ping statistics for 206.72.125.201: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 103ms, Maximum = 110ms, Average = 106ms I've checked my HOSTS file, and there's nothing that refers to ANY Microsoft URL in there. What could be causing this!?? More importantly, how do I fix it? Just for kicks, I've even included the results of a traceroute here for your enjoyment. OS: Windows 7 Ultimate Thanks in advance! -Sootah

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• Can't reliably ping 6224 router from directly-attached system

  - by David Mackintosh

  OK, here's my situation. This is on the internet. The 6224 is the router in this picture and physically resides in Kanata. Both VLAN 1697 and 3994 are provided by an internet service provider. These VLANs are provided through a single 1Gb ethernet wire. The Kanata hosts are directly attached to the 6224; the other two sites are remote. VLAN 3994 is a single IP address space, so theoretically it shouldn't matter physically where the hosts on that subnet are. Here's the problem. I have a monitoring system which is connected further into the internet, so probes from the monitor would come in to this diagram on the 1697 VLAN. When I ping hosts at Albert or Bells Corners from the internet, there is 0 loss. The connection looks perfect. When I ping hosts at Kanata, I lose anywhere from 10 to 40% of the pings. The loss is not predictable, but: when I do lose them, I always lose at least 3, usually 4, rarely more, pings in a bunch. I have attached a monitor directly to the 6224 in Kanata on 3994.. When the monitor pings the 6224 routing interface, I see exactly the same loss pattern -- but NOT at the same time as the loss from the remote system. Ping time is around 1ms. When the monitor pings another system directly attached to the 6224, there is 0 loss. Ping time is about 0.1ms, one-tenth of the time to ping the router. Anyone know what is going on here?

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• Very Slow DSL (ethernet) speed [New Interesting Update]

  - by Abhijit

  Very IMPORTANT and INTERESTING UPDATE: Due to some reason I just thought to do a complete new setup and this time I decided to again have openSUSE plus ubuntu. So I first reinstall lubuntu and then I installed OpenSUSE 12.2 (64 bit). Now, my DSL speed is working very normal and fine on opensuse. So this is very scary. Is it possible for any operating system to manipulate my NIC so that it will work fine only on that operating system and not on another os? Regarding positive thinking and not being paranoid, what is it that makes ONLY suse to get my NIC to work at normal speed but ubuntu can not do it? Not even fedora? Not even linux mint? What all these OS are lacking that enables suse to work great? == ORIGINAL QUESTION == I 'was' on opensuse 12.2 when my dsl speed was normal. Yesterday I switched from opensuse to ubuntu 12.04 and speed decreased. It came to range of 7-10-13-20-25-kbps. Then I switch to linux mint, and then to fedora. Still slow speed. When I was in ubuntu I disabled ipv6 but still no luck. Now I am in fedora but this time with DIFFERENT ISP. And still I am getting very slow sped. So my guess is this is nothing to do with os. What can be wrong? Is this problem of NIC? Does NIC speed decreases over time? Does NIC life ends over time as with keyboard or mouse? Help please All the os I used are 64 bit and my laptop is Compaq Presario A965Tu Intel Centrino DUal Core. Interesting thing to notice is I get normal speed while downloading torrent inside torrent client softwares. This slow speed issue applied to download from any web browser or installing software using terminal.

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• Does using a hexacore CPU make sense?

  - by Exa

  I'm currently planning to upgrade my computer system and I want to exchange CPU, board and RAM. I already had a look at some hexacore-CPUs from AMD and would like to know if it makes any sense to use such a CPU with six cores. Is there any software which really uses six cores? Especially in gaming? I'm using this PC mostly for gaming and from time to time for developing. I know that on the dual-core system (2 x 3GHz) I currently use, Visual Studio creates two instances of the compiler, one for each core. Would there be six instances of the compiler on a hexacore system for super fast compiling? Is there any software that uses six cores? Would running two applications cause the usage of more CPUs? (For example two CPUs for a game you're playing while two other CPUs are used for compiling at the same time) I hope someone can point out the benefits of a hexacore system. The OS would be Windows 7 64 Bit and I use the PC for gaming most of the time. (Crysis 2, CoD, stuff like that)

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• Pinging computer name in LAN results in public IP?

  - by Bob

  Hi, I recently introduced a new machine to my LAN. The computer name for this machine is 'server'. Historically I've been able to access machines from my home network (from a web browser or RDP) using the machine name and it resolves to a local IP address just fine. However, I can't seem to do this anymore. When I ping the computer name, I get the following: C:\Users\Robert>ping server Pinging server.router [67.215.65.132] with 32 bytes of data: Reply from 67.215.65.132: bytes=32 time=24ms TTL=54 Reply from 67.215.65.132: bytes=32 time=23ms TTL=54 Reply from 67.215.65.132: bytes=32 time=24ms TTL=54 Reply from 67.215.65.132: bytes=32 time=24ms TTL=54 I notice also that it appends the 'router' suffix to my domain name for some reason. 'router' is the name of my router, obviously. I'm also using OpenDNS as my DNS provider (configured through my router so it gets passed down through DHCP). Why is this not working for me? Can someone explain how the DNS resolution should take place? For LAN resolution, it shouldn't go straight to OpenDNS. I thought that each Windows machine kept it's own sort of "mini DNS server" that knows about all machines on the local network and it first tries to resolve using that. Please let me know what I can do to get this working!

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• How to set static ip address on vmware for NAT guest vms from an ubuntu Host dhcp server?

  - by javadba

  I need to configure various linux flavor NAT'ed guest vm's to have static ip addresses provided by the Ubuntu host. The vmware documentation punts on this topic, deferring to "see the man pages for your linux distribution". But the generic pages for "my linux distro" do not know about the special stuff for vmware e.g. vmnet8. Pointers from someone who just knows how to do this would be much appreciated. Here is the /etc/vmware/vmnet8/dhcpd/dhcpd.conf: allow unknown-clients; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours subnet 192.168.238.0 netmask 255.255.255.0 { range 192.168.238.128 192.168.238.254; option broadcast-address 192.168.238.255; option domain-name-servers 192.168.238.2; option domain-name localdomain; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours option netbios-name-servers 192.168.238.2; option routers 192.168.238.2; } host vmnet8 { hardware ethernet 00:50:56:C0:00:08; fixed-address 192.168.238.1; option domain-name-servers 0.0.0.0; option domain-name ""; option routers 0.0.0.0; } Fromt the dhcpd.conf documentation, we are supposed to add an entry for static hosts similar to the following: host mystatichostonee { hardware ethernet 00:20:6B:C7:9B:E4; fixed-address 192.168.238.101; } host mystatichosttwo { hardware ethernet 00:23:7a:C7:9c:F2; fixed-address 192.168.238.102; } But notice that the vmnet8 entry in the vmware-generated dhcpd.conf already is set to fixed-address. I don't know how to add the specifics for my hosts to that vmnet8 entry: do they become nested?

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• Microsoft Excel not graphing

  - by SmartLemon

  Im not sure if this is a math question or a su question. The experiment was relating the period of one "bounce" when you hang a weight on a spring and let it bounce. I have this data here, one being mass and one being time. The time is an average of 5 trials, each one being and average of 20 bounces, to minimize human error. t 0.3049s 0.3982s 0.4838s 0.5572s 0.6219s 0.6804s 0.7362s 0.7811s 0.8328s 0.869s The mass is the mass that was used in each trial (they aren't going up in exact differences because each weight has a slight difference, nothing is perfect in the real world) m 50.59g 100.43g 150.25g 200.19g 250.89g 301.16g 351.28g 400.79g 450.43g 499.71g My problem is that I need to find the relationship between them, I know m = (k/4PI^2)*T^2 so I can work out k like that but we need to graph it. I can assume that the relationship is a sqrt relation, not sure on that one. But it appears to be the reverse of a square. Should it be 1/x^2 then? Either way my problem is still present, I have tried 1/x, 1/x^2, sqrt, x^2, none of them produce a straight line. The problem for SU is that when I go to graph the data on Excel I set the y axis data (which is the weights) and then when I go to set the x axis (which is the time) it just replaces the y axis with what I want to be the x axis, this is only happening when I have the sqrt of "m" as the y axis and I try to set the x axis as the time. The problem of math is that, am I even using the right thing? To get a straight line it would need to be x = y^1/2 right? I thought I was doing the right thing, it is what we were told to do. I'm just not getting anything that looks right.

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• Configuring Vmware virtual machines to run under different IPs and PC specs

  - by Alex

  Right now I'm using a simple VmWare virtual machine with preinstalled Win 7. The IP is assigned automatically (it's the same as main OS IP). Is it possible to create several virtual machines that have different hardware specifications and different IP addresses? Here is what I mean regarding these issues: Specs: Certainly, you can easily change some specifications in the Settings menu (RAM size, HDD size), but what about advanced settings? For example: advanced settings for the Processor: is it AMD (2500+,4000+, etc.. ) or Intel (core 2, Pentium, etc..) Ram - is it Corsair 4 Gb 1333 Mhz or Kingston 2 x 2 Gb 866Mhz or something else? Hdd - Is it Seagate Barracuda 80 gb 5400 Rpm or is it Samsung 500Gb 7200 Rpm or some random SSD? Programs that work under a Virtual Machine shouldn't have a clue if that's a VmWare or not. IPs: Every program that's launched under main OS use the real IP: 93.56.xx.xx All programs that are launched under virtual machine A use IP 1: 74.78.xx.xx All programs that are launched under virtual machine B use IP 2: 84.159.xx.xx I believe that you have to use either VPN or Proxy to solve this problem. The Sum Up: The idea is to create 2-3 independent virtual machines with different hardware specifications and IP addresses. Programs that work under a certain Virtual Machine shouldn't have a clue if that's a VmWare or the real PC. Any ideas/tips or experience regarding configuration will be appreciated!

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• Google 2-step verification: Should my phone know my password? [closed]

  - by Sir Code-A-Lot

  Hi, Just enabled 2-step verification for my Google account. I have installed Google Authenticator on my Android phone, and I set up an application specific password for the Google account associated on my phone. This works great when just using installed apps like Gmail, Calendar and Google Reader. But if I want to access Google Docs, Google Tasks or any other website that requires a Google login, I don't seem to be able to use a application specific password. I have to use my real password and then use Google Authenticator to make a code for the next step. This means if my phone is stolen, revoking the password to my phone is pointless. The phone have already been verified, and all that is needed is my password, which the phones browser will have remembered. I realize that I can take measures to ensure the phones browser doesn't remember my password, but that's just not convenient at all. Am I missing something, or is there no elegant solution to this? Should I just let my phone know my real password? As I see it, being able to login with application specific passwords on websites (which apparently isn't possible) is the only way I can revoke my phones access in a meaningful way.

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• Exchange 2010 update timezone of all calendar items

  - by Andrew

  We are currently operating Exchange 2010 server with Outlook 2010 clients on a ship. We have just changed timezones for the first time in quite a while today. Is there any way to rebase all the calendars and/or update all the calendar items to the new timezone at the same time? I have looked at the following tools already. Microsoft Exchange Calendar Update Configuration Tool - http://www.microsoft.com/en-us/download/details.aspx?id=6266 (Doesn't support exchange 2010) Time Zone Data Update Tool for Microsoft Office Outlook - http://www.microsoft.com/en-us/download/details.aspx?id=17291 The Time Zone Data Update Tool for Microsoft Office Outlook does work for individual users, but has some serious downsides. Including each user needs to run it (approx 400 users), and also it only seems to work on the default account in Outlook 2010, a lot of our users have role accounts as well that we would need to run the tool on. The only way I can find to get this tool to run on the role accounts is to make the role account the default account in outlook, and that in itself is quiet an involved process especially if you have 2 or 3 role accounts. So is there a way to just change all calendar items on our Exchange server to a different timezone in one go? We are a little unique in terms of the whole organisation can change timezones over night, meeting rooms and all, but surely a product as advanced as Exchange 2010 allows us to do what we need.

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• Measuring performance indicators on a cluster

  - by Aditya Singh

  My architecture is based on Amazon. A ELB load balancer balances POST requests among m1.large instances. Every instance has a nginx server on port 80 which distributes the requests to 4 python-tornado servers on backend which handle the request. These tornado servers are taking about 5 - 10ms to respond to one request but this is the internal compute time of every request. I want to put this thing on test and i want to measure the response time from ELB to upstream and back and how does it vary when the QPS throughput is increased and plot a graph of Time vs. QPS vs. Latency and other factors like CPU and Memory. Is there a software to do that or should i log everything somewhere with latency checks and then analyze the whole log to get the stuff out. I would also need to write a self-monitor which keeps checking the whole response time. Is it possible to do it with a script from within the server. If so, will it be accurate ?

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• How does Google geo location service work?

  - by heaosax

  I dont use google maps much, but I was using it today and I clicked the "Show my location" button for the first time, then firefox asked for permission and I clicked "share my location", google maps showed my location pretty accurate. But, how does this system really works? I mean how can google know where I live? I am connecting to the internet with a VPN, so my "public IP" is not from my country, but from sweden, also I use linux and I change the mac of my wireless device, but google still show my location. I know I can disable this feature setting firefox about:config geo.enabled to false, but I am curious about how google can know where I live even when I dont have a real mac address and my IP is not from my real country. Basically I'd like to know if this feature works only because of code that exists in chrome and firefox (which spies my system)? I am worried about anyone knowing where I live, I mean... where is my privacy? Part of the fun about the internet is remaining anonymous.

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• Possible to have different SSLCACertificateFiles under different Location in Apache (client side ssl certs)

  - by Mikko Ohtamaa

  I am setting up Apache to do smartcard authentication. The smartcard login is based on client-side SSL certificates handled by an OS driver. I have currently just one smartcard provider, but in the future there are potentially several of them. I am not sure how Apache 2.2. handles client-side certifications per Location. I did some quick testing and it somehow seemed that only the last SSLCACertificateFile directive would have been effective and this doesn't sound right. Is it possible to have different SSLCACertificateFile per Location in Apache (2.2, 2.4) as described below or is SSL protocol somehow limiting that you cannot have more than one SSLCACertificateFile per IP? Example potential config below how I wish to handle several SSLCACertificateFile on the same server to allow users to log in with different smartcard provides. <VirtualHost 127.0.0.1:443> # Real men use mod_proxy DocumentRoot "/nowhere" ServerName local-apache ServerAdmin [email protected] SSLEngine on SSLOptions +StdEnvVars +ExportCertData # Server-side HTTPS configuration SSLCertificateFile /etc/apache2/certificate-test/server.crt SSLCertificateKeyFile /etc/apache2/certificate-test/server.key # Normal SSL site traffic does not require verify client SSLVerifyClient none SSLVerifyDepth 999 # Provider 1 <Location /@@smartcard-login> SSLVerifyClient require SSLCACertificateFile /etc/apache2/certificate-test/ca.crt # Apache does not natively pass forward headers # created by SSLOptions +StdEnvVars, # so we pass them forward to Python using RequestHeader # from mod_headers RequestHeader set X-Client-DN %{SSL_CLIENT_S_DN}e RequestHeader set X-Client-Verify %{SSL_CLIENT_VERIFY}e </Location> # Provider 2 <Location /@@smartcard-login-provider-2> # For real SSLVerifyClient require SSLCACertificateFile /etc/apache2/certificate-test/provider2.crt # Apache does not natively pass forward headers # created by SSLOptions +StdEnvVars, # so we pass them forward to Python using RequestHeader # from mod_headers RequestHeader set X-Client-DN %{SSL_CLIENT_S_DN}e RequestHeader set X-Client-Verify %{SSL_CLIENT_VERIFY}e </Location> # Connect to Plone ZEO client1 running on fg ProxyPass / http://localhost:8080/VirtualHostBase/https/local-apache:443/folder_sits/sitsngta/VirtualHostRoot/ ProxyPassReverse / http://localhost:8080/VirtualHostBase/https/local-apache:443/folder_sits/sitsngta/VirtualHostRoot/ </VirtualHost>

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• Simple Distributed Disconnected way to sync a directory

  - by Rory

  I want to start regularly backup my home directory on my ubuntu laptop, machine X. Suppose I have access to 2 different remote (linux) servers that I can backup to, machines A & B. Machine X will be the master, and should be synced to A and B. I could just regularly run rsync from X to A and then from X to B. That's all I need. However I'm curious if there's a more bandwidth effecient, and hence faster way to do it. Assuming X is going to be on residential style broadband lines, and since I don't want to soak up the bandwidth, I would limit the transfer from X. A and B will be on all the time, however X, will not be, so I'd also like to reduce the amount of time that X is transfering, potentially allowing A and B to spend more time transfering. Also, X won't be connected all the time. What's the best way to do this? rsync from X to A, then from A to B? Timing that right could be troublesome. I don't want to keep old files around, so if I was to rsync, then the --del option would be used. Could that mean something might get tranfered from A to B, then deleted from B, then transfered from A to B again? That's suboptimal. I know there are fancy distributed filesystems like gluster, but I think that's overkill in this case, and might not fit with the disconnected nature.

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• reverse proxying with NGINX to two back-end servers

  - by aag

  I am trying to learn how to configure the Nginx proxy. All requests from external (www.external.com) should go to internal server 10.10.10.16:2080, except for www.external.com/nagios requests, which should go to internal 10.10.10.18. My location block looks as follows: location ~* / { proxy_buffers 16 4k; proxy_buffer_size 2k; proxy_buffering off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Accept-Encoding ""; proxy_pass http://10.10.10.16:2080; } # # nagios server location ~* /nagios/ { proxy_buffers 16 4k; proxy_buffer_size 2k; proxy_buffering off; # proxy_set_header Host $host; # proxy_set_header X-Real-IP $remote_addr; # proxy_set_header Accept-Encoding ""; proxy_pass http://10.10.10.18; } The first location seems to work fine. However, any request to www.external.com/nagios sends the browser into the eternal pastures. Of course, 10.10.10.18/nagios was tested and works fine. What am I missing?

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• Securing NTP: which method to use?

  - by Harry

  Can someone good at NTP configuration please share which method is the best/easiest to implement a secure, tamper-proof version of NTP? Here are some difficulties... I don't have the luxury of having my own stratum 0 time source, so must rely on external time servers. Should I read up on the AutoKey method or should I try to go the MD5 route? Based on what I know about symmetric cryptography, it seems that the MD5 method relies on a pre-agreed set of keys (symmetric cryptography) between the client and the server, and, so, is prone to man-in-the-middle attack. AutoKey, on the other hand, does not appear to work behind a NAT or a masquerading host. Is this still true, by the way? (This reference link is dated 2004, so I'm not sure what is the state of art today.) 4.1 Are public AutoKey-talking time servers available? I browsed through the NTP book by David Mills. The book looks excellent in a way (coming from the NTP creator after all), but the information therein is also overwhelming. I just need to first configure a secure version of NTP and then may be later worry about its architectural and engineering underpinnings. Can someone please wade me through these drowning NTP waters? Don't necessarily need a working config from you, just info on which NTP mode/config to try and may be also a public time server that supports that mode/config. Many thanks, /HS

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• LVS / IPVS difference in ActiveConn since upgrading

  - by Hans

  I've recently migrated from an old version of LVS / ldirectord (Ultra Monkey) to a new Debian install with ldirectord. Now the amount of Active Connections is usually higher than the amount of Inactive Connections, it used to be the other way around. Basically on the old load balancer the connections looked something like: -> RemoteAddress:Port Forward Weight ActiveConn InActConn -> 10.84.32.21:0 Masq 1 12 252 -> 10.84.32.22:0 Masq 1 18 368 However since migrating it to the new load balancer it looks more like: -> RemoteAddress:Port Forward Weight ActiveConn InActConn -> 10.84.32.21:0 Masq 1 313 141 -> 10.84.32.22:0 Masq 1 276 183 Old load balancer: Debian 3.1 ipvsadm 1.24 ldirectord 1.2.3 New load balancer: Debian 6.0.5 ipvsadm 1.25 ldirectord 1.0.3 (I guess the versioning system changed) Is it because the old load balancer was running a kernel from 2005, and ldirectord from 2004, and things have simply changed in the past 7 - 8 years? Did I miss some sysctl settings that I should be enforcing for it to behave in the same way? Everything appears to be working fine but can anyone see an issue with this behaviour? Thanks in advance! Additional info: I'm using LVS in masquerading mode, the real servers have the load balancer as their gateway. The real servers are running Apache, which hasn't changed during the upgrade. The boxes themselves show roughly the same amount of Inactive Connections shown in ipvsadm.

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• initrd problem and Kernel panics after openSUSE 11.2 upgrade.

  - by unixbhaskar

  Once I have done the upgrade form openSUSE11.1 to openSUSE11.2 by doing this: zypper dup Now I tried to boot the system and it failed sync with VFS and kernel panic, so clearly a initrd problem . if I'm not mistaken. Now a bit of explanation about the problem: while upgrading it shows me the error updating initramfs( I forgot the exact error or might be warning).Oh yeah it shows some grub warning too. I have had been doing that from a chroot environment.. with all the required file mounted in proper place in the chroot environment. Now .after bit googling and painfully looking the susegeek.com forum and opensuse.org forum I have decided to recreate the initrd ...but the fellow called "mkinitrd" is real real crap as I hev been pointed out by few forum members. I tried to make an initrd image by myself, failed to do so .as it shows error that device not found( if I boot into suse live cd and mount the partition ) then I tried from the chrooted env and it says "there is no space left on the device" A bit bemused :( yeah most of you pointed it right may lack of knowledge of mine. Kindly suggest me and show me steps to do it correctly and get opensuse11.2 up and running. TIA

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• Apache https is slow

  - by raucous12

  Hey, I've set apache up to use SSL with a self signed certificate. With https (KeepAlive on), I can get over 3000 requests per second. However, with https (KeepAlive off), I can only get 13 requests per second. I know there is supposed to be a bit of an overhead, but this seems abnormal. Can anyone suggest how I might go about debugging this. Here is the ab log for https: Server Software: Apache/2.2.3 Server Hostname: 127.0.0.1 Server Port: 443 SSL/TLS Protocol: TLSv1/SSLv3,DHE-RSA-AES256-SHA,4096,256 Document Path: /hello.html Document Length: 29 bytes Concurrency Level: 5 Time taken for tests: 30.49425 seconds Complete requests: 411 Failed requests: 0 Write errors: 0 Total transferred: 119601 bytes HTML transferred: 11919 bytes Requests per second: 13.68 [#/sec] (mean) Time per request: 365.565 [ms] (mean) Time per request: 73.113 [ms] (mean, across all concurrent requests) Transfer rate: 3.86 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 190 347 74.3 333 716 Processing: 0 14 24.0 1 166 Waiting: 0 11 21.6 0 165 Total: 191 361 80.8 345 716 Percentage of the requests served within a certain time (ms) 50% 345 66% 377 75% 408 80% 421 90% 468 95% 521 98% 578 99% 596 100% 716 (longest request)

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• How to setup bindings for development IIS 7.5 with lot of sites

  - by Antonio Bakula

  I am a programmer in a small ASP.NET shop with very little expirience in server administration, and I have to setup IIS 7.5 to host lot of sites on newly installed windows server 2008 R2, these sites are test "clones" for sites on "real" web server and they should be accessible only in local network (domain). Developers should add new sites for our new customers. Project managers use this server to check progress and test new sites and new features, QA people have to have access to this site and test before we copy it to the "real" web server. Developers only have access to IIS console, in fact they can use RDP to test server with their developer domain credentials and permissions, also developers are local admins on that machine (tester). On our previous server I used different port numbers for each site. That worked but don't like this solution, I would prefer to use subdomains. But here are the problems: manually adding DNS records is not an option because we do not wont that developers have to administer domain DNS server, and currently this had to be done with domain administrator credentials. Is there a some way to add DNS record automatically ? I tried to add DNS record for subdomains on test server with wildcard (*.tester) and that seems to work for some time but that change coused some bad problems in our domain network and admin forbid me to mess with DNS, he said that I have to add DNS record for every subdomain manually and that I can not use wildcards, and there is nothing that I can do about it, mainly for "politicall" reasons :( obviously our admin is pretty much uncooperative, outsorced from different organization and I can't do anything about that. can I add another DNS server on that machine ? What must be setup on clients machines to "tell" them to use domain DNS server and tester domain server ? So please I need someone to give me some advice, what should I do ? Is different port numbers only option left ? Thanks !

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• vSphere education - What are the downsides of configuring virtual machines with *too* much RAM?

  - by ewwhite

  VMware memory management seems to be a tricky balancing act. With cluster RAM, Resource Pools, VMware's management techniques (TPS, ballooning, host swapping), in-guest RAM utilization, swapping, reservations, shares and limits, there are a lot of variables. I'm in a situation where clients are using dedicated vSphere cluster resources. However, they are configuring the virtual machines as though they were on physical hardware. In turn, this means a standard VM build may have 4 vCPUs and 16GB or more of RAM. I come from the school of starting small (1 vCPU, minimal RAM), checking real-world use and adjusting up as necessary. Some examples from a "problem" cluster. Resource pool summary - Looks almost 4:1 overcommitted. Note the high amount of ballooned RAM. Resource allocation - The Worst Case Allocation column shows that these VMs would have access to less than 50% of their configured RAM under constrained conditions. The real-time memory utilization graph of the top VM in the listing above. 4 vCPU and 64GB RAM allocated. It averages under 9GB use. Summary of the same VM What are the downsides of overcommitting and overconfiguring resources (specifically RAM) in vSphere environments? Assuming that the VMs can run in less RAM, is it fair to say that there's overhead to configuring virtual machines with more RAM than they need? What is the counter-argument to: "if a VM has 16GB of RAM allocated, but only uses 4GB, what's the problem??"? E.g. do customers need to be educated? What specific metric should be used to meter RAM usage. Tracking the peaks of "Active" versus time?

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• JBoss database connection pool configuration

  - by Qben

  I am facing an connection pool issue in my clustered JBoss installation. From time to time one of my connection pools will hit the roof and I get a lot of these in my logfile. java.sql.SQLException: No ManagedConnections available within configured blocking timeout ( 30000 [ms] ); The odd thing is that I can see in the JMX console that the ConnectionCount hit the roof, but at the same time InUseConnectionCount is often quite small. The problem will resolve itself after a couple of minutes but during recovery phase my application will not work (for obvious reasons). The question is if this indicate an error in the configured timeouts of the connections (I pretty much use defaults), or if my pool is simply too small to handle the peaks. Under normal operation I would say I use ~40% of the configured max number of connections. The reason I just don't increase the max number of connection is that if I actually used up all connections I suspect that InUseConnectionCount would hit the roof. Hence I suspect I might have more issues than just a too small pool size. Maybe InUseConnectionCount has decreased at the time I check jmx-console and it actually do hit the roof? I tend to collect data every second minute. Any hints are more than welcome.

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• apache/httpd responds slower under EL6.1 than EL5.6 (centos)

  - by daniel

  I've read through other threads on performance differences between RHEL6 and RHEL5, but none seem a tight match to mine. My issue manifests itself in slightly slower average response time (20ms) per request. I have about 10/10 servers of the same hardware spec with Cent6.1 and Cent5.6. The issue is consistent across the group. I am running Ruby on Rails with Passenger. Apache config is identical (checked out from the same SVN repo) Ruby and Passenger are identical builds. Application is identical and being served traffic round robin. mod_worker An interesting clue from server-status: The Cent6.1 servers have a steady 20-40 threads in the "Reading Request" state while the Cent5.6 servers have around 1. I'm graphing this so I can see it trend over time. I also have a bunch of much newer machines that are significantly faster and are running Cent6.1. They dust all the older machines in response time, but I can see they also have a steady 20-40 threads in the "Reading Request" state. This makes me believe I can get their response time down, if I can figure out what is holding up these requests. My gut is telling me that I need to tune some network setting in sysctl, but I haven't figured it out yet. Help is appreciated.

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