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  • How do you manage large web farms?

    - by Andrew Katz
    I have a quickly growing web farm running IIS 7 (30+ servers). All servers are identical copies of each other and all servers are physical. We update the software about once a month, and in the current process, we follow the following steps: Disable server from pool on F5 load balancer. Disable HTTP Keep-alives in IIS so connections drop quickly. Change default directory of website to new folder containing new binaries. Test server Enable HTTP Keep-alives. Enable server in F5 pool. Move to server 2 Microsoft used to have Application Center which was abandoned a while ago. They have made a second attempt with the Web Farm Framework, but this adds as much QA time testing the release package as it saves in the deployment. Has anyone seen a commercial off the shelf application that is tailored for managing and deploying to large web farms? Thanks!

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  • Server 2012 intermittently fails to respond to pings from single host, even with firewall disabled, but responds to non-ICMP requests fine

    - by James Westbury
    This one is kind of weird. I've got the following machines involved: DC01 - 10.1.2.42, Server 2012, domain controller & DNS server, physical machine nagiosv - 10.1.2.35, CentOS 6.4, Nagios, virtual machine CB01 - 10.1.3.81, Ubuntu 12.04 LTS, couchbase server, virtual machine So, I noticed something was wrong while configuring this new Nagios VM. I started seeing DC01's state flapping. I logged into nagiosv when I saw this happening, and attempted to ping DC01, both by FQDN and its IP address. Neither worked. I tried pinging the machine from CB01, which is another VM on the same virtual switch/physical NIC as nagiosv, and that worked fine. Pings still failing from nagiosv at this time. DC01 is also an internal DNS server, so I ran dig google.com from nagiosv, and was able to run a query against DC01 just fine: ;; Query time: 1 msec ;; SERVER: 10.1.2.42#53(10.1.2.42) ;; WHEN: Fri Nov 1 07:53:51 2013 ;; MSG SIZE rcvd: 204 Pings still failing from nagiosv, though. I can ping from DC01 to nagiosv, and that works, and I can still ping from other VMs on the same physical NIC into DC01, and that works. I should mention at this point that I've disabled the firewall on DC01 for testing purposes, and it doesn't make a damned bit of difference. (Even with the firewall enabled, I have a blanket exception for ICMP from the local subnet, so it shouldn't make a difference, but I figured I should test it anyway.) I loaded up Wireshark on DC01 and pinged it from nagiosv again. What I see is a bunch of echo requests coming in and not a single reply going back out. Filtered results here, showing all ICMP traffic during a 15-second period. A few more bits of info: There are no IP conflicts on the network. MAC addresses on the incoming pings match the MAC on the VM. There are no duplicate MACs on the network, as far as I can see. I have absolutely no idea why DC01 is failing to respond, here. Any ideas?

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  • Run a local command after closing an SSH connection?

    - by James B
    I've set up my zsh to update the XTerm title whenever I change directories. It's neat! Unfortunately I have one common problem, which is this: % cd foo; # title changes to "host1:~/foo" % ssh host2; # title changes to "host2:~" % pwd /home/user/foo # title is still "host2:~" I need to run some command anytime an ssh connection terminates, either chpwd, or cd ., or something similar. I don't think I can use an alias, because I'd need something like alias ssh=ssh $*; cd . but AFAICT you can't pick where the arguments go in an alias.

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  • Is it possible to download extremely large files intelligently or in parts via SSH from Linux to Windows?

    - by Andrew
    I have a ~35 GB file on a remote Linux Ubuntu server. Locally, I am running Windows XP, so I am connecting to the remote Linux server using SSH (specifically, I am using a Windows program called SSH Secure Shell Client version 3.3.2). Although my broadband internet connection is quite good, my download of the large file often fails with a Connection Lost error message. I am not sure, but I think that it fails because perhaps my internet connection goes out for a second or two every several hours. Since the file is so large, downloading it may take 4.5 to 5 hours, and perhaps the internet connection goes out for a second or two during that long time. I think this because I have successfully downloaded files of this size using the same internet connection and the same SSH software on the same computer. In other words, sometimes I get lucky and the download finishes before the internet connection drops for a second. Is there any way that I can download the file in an intelligent way -- whereby the operating system or software "knows" where it left off and can resume from the last point if a break in the internet connection occurs? Perhaps it is possible to download the file in sections? Although I do not know if I can conveniently split my file into multiple files -- I think this would be very difficult, since the file is binary and is not human-readable. As it is now, if the entire ~35 GB file download doesn't finish before the break in the connection, then I have to start the download over and overwrite the ~5-20 GB chunk that was downloaded locally so far. Do you have any advice? Thanks.

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  • Can a 32-bit RHEL4 userland work with a 64-bit kernel?

    - by James
    Is there a way to change an i386 RHEL4 machine to run an amd64 kernel, but ensure that it still builds software into same i386 binaries? On Debian this seems quite straightforward: just install an amd64 kernel (worst case, build one like this guy: http://www.debian-administration.org/users/jonesy/weblog/1) and prefix everything with "linux32". Then everything that considers uname -m will be unchanged, I just need to handle the few cases that consider uname -r. What is the Red Hat equivalent? Is the only way a full 64-bit installation on another disk and then chrooting back to the 32-bit system before anyone builds anything? (Even the best examples of that seem to be Debian-based.) Background: We make a large system that runs on (a variant of) i386 RHEL4. However, some of the larger RHEL build machines now have enough RAM that they might benefit from going 64-bit (for the kernel and maybe some of the bigger build steps). Our build system doesn't support cross-compilation.

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  • multiple problems--windows 7 mbr, others

    - by Andrew
    After buying a new laptop(XPS L501X) with windows 7 preinstalled, I decided to make it dual boot with windows Vista. I now know about the issue with installing previous versions of windows, and the deletion of the MBR. Normally this wouldn't be a problem, but Microsoft no longer sends install disks with their computers, so there is no way to just re-install windows 7. If anyone can help it would be much appreciated. Data preservation is not an issue, as the laptop is new.

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  • Windows 7 Wireless Network Adapter Stopped Working

    - by Andrew B Schultz
    I have a Windows 7 Ultimate machine where the wireless adapter all of a sudden started having trouble connecting to wireless networks. Whenever I go to a new place and try to connect to a wireless network, it says that the DNS server is not responding, and tells me to go unplug the router and try again. After several locations in a row telling me this, I began to realize something was wrong with my adapter, not the routers. I am no longer asked to identify the security level for any new networks (Work, Home, or Public) like I used to be (it defaults to Public now - with the park bench icon). Often, resetting the router doesn't even work. Running the Windows 7 troubleshooter doesn't give me anything better than the advice to reset the router. However, the adapter will still connect to the wireless network at my main office without any problems. Does anyone know why a wireless network adapter can get so finicky so suddenly? Thanks!

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  • Cannot install grub to RAID1 (md0)

    - by Andrew Answer
    I have a RAID1 array on my Ubuntu 12.04 LTS and my /sda HDD has been replaced several days ago. I use this commands to replace: # go to superuser sudo bash # see RAID state mdadm -Q -D /dev/md0 # State should be "clean, degraded" # remove broken disk from RAID mdadm /dev/md0 --fail /dev/sda1 mdadm /dev/md0 --remove /dev/sda1 # see partitions fdisk -l # shutdown computer shutdown now # physically replace old disk by new # start system again # see partitions fdisk -l # copy partitions from sdb to sda sfdisk -d /dev/sdb | sfdisk /dev/sda # recreate id for sda sfdisk --change-id /dev/sda 1 fd # add sda1 to RAID mdadm /dev/md0 --add /dev/sda1 # see RAID state mdadm -Q -D /dev/md0 # State should be "clean, degraded, recovering" # to see status you can use cat /proc/mdstat This is the my mdadm output after sync: /dev/md0: Version : 0.90 Creation Time : Wed Feb 17 16:18:25 2010 Raid Level : raid1 Array Size : 470455360 (448.66 GiB 481.75 GB) Used Dev Size : 470455360 (448.66 GiB 481.75 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Nov 1 15:19:31 2012 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : 92e6ff4e:ed3ab4bf:fee5eb6c:d9b9cb11 Events : 0.11049560 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 8 17 1 active sync /dev/sdb1 After bebuilding completion "fdisk -l" says what I have not valid partition table /dev/md0. This is my fdisk -l output: Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00057d19 Device Boot Start End Blocks Id System /dev/sda1 * 63 940910984 470455461 fd Linux raid autodetect /dev/sda2 940910985 976768064 17928540 5 Extended /dev/sda5 940911048 976768064 17928508+ 82 Linux swap / Solaris Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000667ca Device Boot Start End Blocks Id System /dev/sdb1 * 63 940910984 470455461 fd Linux raid autodetect /dev/sdb2 940910985 976768064 17928540 5 Extended /dev/sdb5 940911048 976768064 17928508+ 82 Linux swap / Solaris Disk /dev/md0: 481.7 GB, 481746288640 bytes 2 heads, 4 sectors/track, 117613840 cylinders, total 940910720 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/md0 doesn't contain a valid partition table This is my grub install output: root@answe:~# grub-install /dev/sda /usr/sbin/grub-setup: warn: Attempting to install GRUB to a disk with multiple partition labels or both partition label and filesystem. This is not supported yet.. /usr/sbin/grub-setup: error: embedding is not possible, but this is required for cross-disk install. root@answe:~# grub-install /dev/sdb Installation finished. No error reported. So 1) "update-grub" find only /sda and /sdb Linux, not /md0 2) "dpkg-reconfigure grub-pc" says "GRUB failed to install the following devices /dev/md0" I cannot load my system except from /sdb1 and /sda1, but in DEGRADED mode... Anybody can resolve this issue? I have big headache with this.

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  • TCP Server Memory management: #Connections Vs. #Requests

    - by Andrew
    Given that, there is no theoretical limit to number of concurrent TCP connections a Windows 2008 server can handle. Only thing will happen is, with each connection there will be memory consumption in server. Unfortunately, memory is not unlimited (and I want to utilize only physical memory). For example, lets say we've 2GB server memory. Now there are two extreme cases: Case 1: If we've allocated 64KB buffer for each connection (only to receive incoming request), then 32768 connections can consume all the 2GB of memory. This will not leave any memory to queue/process incoming requests from those connections. Case 2: On the other hand, lets say a single (or very few) connections continuously keeps sending request buffers (for example, video streaming from one connection to other) and server cannot process them within time, those buffers will get piled up in server and eventually will occupy most of the servers memory. And it will not leave any memory for new connection thereafter. This is the real dilemma in server design bugging me badly for last many days. If I can decide on max size of request buffer per connection and max number of requests to allow in queue per connection. Then, based on available server memory, it will then automatically set limit on max number of concurrent connections. How to decide on these limits to achieve best performance and throughput? I am just looking for perfect utilization of server resources. Are there any standard guidelines or empirical data available with someone who can share with me please.

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  • Celery - minimize memory consuption

    - by Andrew
    We have ~300 celeryd processes running under Ubuntu 10.4 64-bit , in idle every process takes ~19mb RES, ~174mb VIRT, thus - it's around 6GB of RAM in idle for all processes. In active state - process takes up to 100mb of RES and ~300mb VIRT Every process uses minidom(xml files are < 500kb, simple structure) and urllib. Quetions is - how can we decrease RAM consuption - at least for idle workers, probably some celery or python options may help? How to determine which part takes most of memory?

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  • new ubuntu server installation - java server not receiving packets

    - by James
    I have developed a Java server which listens for UDP packets which come from mobile devices. At the moment, it works correctly if I run my Server on my windows PC. I can receive and respond to the UDP packets sent from my phone (over 3g, not wifi). However, I am trying to run the Server on a different computer which I found lying around my house. I have basically done a clean install of Ubuntu Server edition, updated it, installed the java run time environment and configured port forwarding to allow connections on the appropriate port. I have also tried to disable the firewall. The problem is, it doesn't appear as if the server is receiving any packets and I've exhausted my brain thinking on how to solve/debug the problem. Can anyone suggest to me what the problem might be? or more likely something I can do to help me find out more information about what is going wrong.

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  • how to install expect for windows 64 bit?

    - by Master James
    1.Downloaded Active Tcl from http://www.activestate.com/activetcl/downloads/ 2.Installed @ c:/Tcl/ 3.Go to Bin directory in Command prompt (Start Run commad cd c:\Tcl\bin) 4.To install Expect, executed command teacup install Expect It Appears as : Resolving Expect ... Not found in the archives. While a more fuzzy search disregarding letter case and accepting substrings was done, we are sorry to say that it yielded no possible candidates for installation either. Questions to consider: Have you spelled the name correctly ? Including the proper case of characters ? Note that teacup's 'search' command allows you to locate packages by subject, categories, and the like. Aborting installation, was not able to locate the requested entity. How to install Expect for windows 7, 64 bit ?

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  • How can I install firefox automatically, and set some settings?

    - by James.Elsey
    Hi. I need to install firefox on 100+ machines, I've done a few manually but its too much of a task to do the whole lot. I need to : Install firefox executable Set "dont import anything(from Internet Explorer)" Set default browser to "no" Set default browser not to check again Copy a shortcut onto the desktop that goes to a specific URL I know this should be able to be implemented with an MSI package, but could I also set those settings? Thanks

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  • How to disable autocmd or augroup in vim?

    - by Andrew Vit
    Given I have a group of commands such as: augroup MyGroup autocmd CursorMoved * silent call MyCommandOne() augroup END I want to disable all the autocommands in MyGroup for a time and then re-enable it later. Is there anything I can do with the group? Specifically, is there a way to disable the whole group at once? If not, what can I do to disable individual commands? Looking at the help, I only see a few options: augroup! will delete the whole group: I don't think this is right since I will want to re-enable it again. (But maybe there's a way to easily redefine the group again?) :noautocmd will only disable the callbacks for a one-off invocation of a command. (And it disables all autocmds, not specified ones) eventignore addresses the event binding, not the command: it sounds like it disables all bound commands for a given event, not just one command or a group I can specify. How is this done?

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  • Having Trouble Ripping Some CD's

    - by James
    Hi, When I buy CD's I tend to rip them to FLAC right away. When ripping I use Foobar2000 or Exact Audio Copy and enable secure ripping which uses error correction. Recently I bought a 2 CD compilation album brand new but when I tried to rip the second CD on my laptop using Foobar2000 it struggled with the last 2 tracks and was unable to finish. EAC was also unable to get an accurate rip and reports read errors. Ripping in fast mode results in audible errors in the output track. I have tried another computer and having similar problems. I cannot see any damage to the disc and it has not been dropped or anything. The weird thing is that I had similar problems with a different album and different PC a while back. This other CD was a compilation disk so it was also right up to the CD capacity limit and again it was the last few tracks that would not rip. Dozens of other discs have ripped fine So I am wondering if the CD is simply defective, or whether it is something else. How common are defective CD's? Do some CD drives struggle with CD's of this capacity? Or Is this some kind of copy protection? I'm thinking of asking Amazon for a replacement but it would be annoying if I get the same problem again.

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  • How to install/configure ffmpeg to compress mp4 videos for flash player delivery?

    - by Andrew Fulton
    We have a flash web-app that created interactive video, and are using ffmpeg to do some compression/resizing when a user "publishes" their project. The user can upload flv files and mp4 files, both of which play fine in the Flash UI before publishing. After publishing the flv files work fine, but the mp4 files will not play in the flash player: Audio will play but video won't. The mp4 files will play fine if I download them and play them in the Quicktime player but if I attempt to open them in the Adobe Media Player it reports "The media file does not contain a supported video track". If I open the Movie inspector in quicktime it tells me that the original file is an "h264" video and the ffmpeg-processed ones are "mpeg-4". I have tried forcing it to h264 by adding flags like -f h264 and -vcodec h264 but I get a screenfull of errors (no frame, illegal POC type, sps_id out of range) ending with Could not find codec parameters (Video: h264) h264 will show up if I run ffmpeg -formats and ffmpeg -codecs, and as I said it will play fine in Quicktime. Is there anything else I need to do to convince the flash player to play them? Is there anything else I need to tell you about the server that will help?

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  • Regression testing for firewall changes

    - by James C
    We have a number of firewalls in place around our organisation and in some cases packets can pass through four levels of firewall limiting the flow TCP traffic. A concept that I'm used to from software testing is regression testing, allowing you to run a test suite against a changed application to verify that the new changes haven't affected any old features. Does anyone have any experience or an offer any solutions to being able to perform the same type of thing with firewall changes and network testing? The problem becomes a lot more complicated because you'd ideally want to be originating (and testing receipt) of packets across many machines.

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  • CPU?: Not responding

    - by James
    I'm attempting to build a system for co-location. I've been running into issues while trying to install CentOS 6.3 System Specs: Motherboard: ASUS m5a99x Process: AMD FX-8120 (8-core Bulldozer) Memory: 2x 4gb G-Skill 2133 running at 1600 I keeps giving me an error message: CPU1: Not Responding. CPU2: Not Responding. CPU3: Not Responding. CPU4: Not Responding. CPU5: Not Responding. CPU6: Not Responding. Then it instantly restarts. I have tried installing it from USB, Multiple DVDs, Multiple Distros. I have also in the bios attempted to disable cores. I was able to disable 2/3 4/5 6/7. I have also ensured that there is zero overclocking. The system works fine in a windows environment. I'm out of ideas.

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  • what does the @ symbol mean in ls -l directory listing?

    - by Andrew Arrow
    When I run ls -l on my mac I see two .yml files: -rw-r--r-- 1 aa staff 6 Apr 15 05:50 s1.yml -rw-r--r--@ 1 aa staff 362 Apr 15 05:49 s3.yml same owner, same permissions but one has a @ at the end of the permisions. The one with the @ shows up in my editor, the one without does not. So there must be some significance. How can I turn on the @ for the file without it? I selected the files in the finder and did get info and everything looks identical between the two files.

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  • Alienware Aurora R2 Slow Boot Up

    - by James R
    I have an Aurora R2 bought a few years ago, and recently I decided a RAM update and new Samsung SSD would be good for speed. So now it's super fast, with the exception of booting up. It still takes good 2 minutes to get past the first splash screen on the BIOS, it's only the BIOS, after that it's like lightning. I've Googled the issue, and the usual problem is the BIOS trying to boot from anything it can, with the fix being to change the boot menu. However I've changed it now, and it's still slow. When I disconnect the USB devices it speeds up, but I can't do that every time I want to boot the PC up! The only other option I can think of is upgrading the BIOS, however it seems that A04 is the recommended on for Aurora R2s, so I don't know if upgrading the BIOS could cause issues, especially not if it doesn't solve the issue. Also, when I disable my original hard drive in the boot menu, the PC won't boot up. Despite the Samsung one being fine to boot from, and the original not being needed as far as I know for starting Windows, it gives me an error message and makes me restart the PC, with a new boot configuration (with the original drive as second choice). Any ideas on how to make the BIOS boot faster? And why I need to have my original drive in the boot menu?

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  • What is good usage scenario for Rackspace Cloud Files CDN (powered by AKAMAI) [closed]

    - by Andrew Smith
    I have just setup my website as static page via Rackspace CDN / Akamai. www.example.co.uk is an alias for d9771e6f24423091aebc-345678991111238fabcdef6114258d0e1.r61.cf3.rackcdn.com. d9771e6f24423091aebc-345678991111238fabcdef6114258d0e1.r61.cf3.rackcdn.com is an alias for a61.rackcdn.com. a61.rackcdn.com is an alias for a61.rackcdn.com.mdc.edgesuite.net. a61.rackcdn.com.mdc.edgesuite.net is an alias for a63.dscg10.akamai.net. a63.dscg10.akamai.net has address 63.166.98.41 a63.dscg10.akamai.net has address 63.166.98.40 a63.dscg10.akamai.net has IPv6 address 2001:428:4c02::cda8:ecb9 a63.dscg10.akamai.net has IPv6 address 2001:428:4c02::cda8:ed09 The HTTP header: HTTP/1.0 200 OK Last-Modified: Fri, 19 Oct 2012 23:27:41 GMT ETag: fdf9e14b77def799e09e8ce815a521da X-Timestamp: 1350689261.23382 Content-Type: text/html X-Trans-Id: tx457979be3bd746c2b4e5403a1189cdbc Cache-Control: public, max-age=900 Expires: Sat, 27 Oct 2012 22:18:56 GMT Date: Sat, 27 Oct 2012 22:03:56 GMT Content-Length: 7124 Connection: keep-alive I am wondering, if it's really the fastest solution to power the website? By investigating it thru http://www.just-ping.com/ it seems, that from many places the ping is very high, and during quick investigation I found that they use GeoIP to resolve addresses based on WHOIS, which is not accurate and because of that from many places the ping is above 300ms (for example, if ISP is in balgladore and request is routed to bangladore even if it's 300ms, for period of 1 month), while by just using Amazon Web Services and Route 53 Anycast DNS servers and only 4 EC2 instances it seems that for example India is always below 100ms, while using Akamai it goes above 300ms in some cases, and this is because Route 53 is using BGP. By quickly checking the Akamai, it seems that they are not getting feedback from the traffic - the high ping stays constant even if I keep downloading large files and videos, which is opposite to what they say on their website. They state, that they optimize the performance by taking feedback from the requests, while it seems they just use GeoIP with per City resolution (which are mostly big cities). Because of this, AWS with Route 53 / Anycast DNS seems to be much more reliable, as well EdgeCast which is using BGP, but I dont know how much does it cost to deploy static website. Actually, I dont know if EdgeCast is not a lie, because from isolated places there are many errors - so their performance is at the cost of quality of delivery, because of BGP switching the routes during transfer of large files. So I was wondering, what is really Akamai good for, because they dont seem to pose any strength in any field in what I do understand now, except they offer some software based WAF on their website, but what I really care about is the core distribiution, so the question is? Is really Akamai good for Videos? For static websites? ??? I found so far AWS most usable with most consistent ping and stable transfers.

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