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  • How to balance the root domain using NS records?

    - by Patrick McCurley
    I have two load balancers that balance incoming traffic across multiple data centers. These work fine. I can test them out by doing an 'nslookup mydomain.com xIP' I have now taken out DNS services with DYN.com to allow me to manage the DNS Zone file so that typing mydomain.com will ask my load balancers what the IP address is to resolve. Step 1 : the NS record for www. I set up A records (glue) for ns1 & ns2, then the corresponding NS record to delegate the DNS lookup to the balancers instead of DYN.com's nameservers. ns1.mydomain.com A [ip address of load balancer 1] ns2.mydomain.com A [ip address of load balancer 1] www.mydomain.com NS ns1.mydomain.com www.mydomain.com NS ns2.mydomain.com All is well - when I type www.mydomain.com, the requests get delegated to my load balancers who provide the IP address of the endpoint and the connect is made successfully. Step 2 : the NS record for root. This is where I run into problems. I need customers to be able to type 'mydomain.com' (without the www) and ALSO get delegated to the load balancers for the IP address. However - of the research I have done, and through the DYN control panel, it seems to be not allowed to provide an NS record for the root - as this overrides the default NS servers. How can i delegate both the root, and the www. to my load balancers?

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  • Installing APC on lighttpd + php 5.2 on Ubuntu 10

    - by Patrick
    I found several tutorials internet about how installing APC (PHP cache) with php5 and apache on Ubuntu, and I've also found some about installing it with lighttpd + php5 on Debian. I actually need a tutorial for installing APC on servers with the following configuration: lighttpd + php 5.2 on Ubuntu 10 I know it should be pretty similar, but if I found the exact tutorial I could save time. Could you help me ? thanks

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  • can't ssh within LAN, but can connect from outside

    - by Patrick B.
    A strange issue: I have a desktop running Ubuntu 10.04 behind a Netgear WNR1000 router performing NAT. I would like to be able to ssh into the desktop from my laptop (running Windows 7 and Cygwin). When at home, both the desktop and the laptop are connected by wireless (the desktop is in a different room from the router). sshd seems to be running fine, since ssh localhost from the desktop works without trouble. Also, ssh my.ip.address from my laptop when it is not behind the router works fine (I am forwarding port 22 on the router to my desktop). However, ssh same.ip.address from within the LAN fails with "Connection refused". ssh 192.168.local.ip.address fails with a different message, "Connection timed out". I can connect if I first ssh to a machine outside the LAN. So far I haven't found anything with Google because with the search terms that seem like they would be relevant, the vast majority of people have the opposite problem - i.e., they can't connect from outside the LAN but can connect within it. I can port forward through a remote server when I'm at home, but this seems like a totally absurd way to connect two computers on the same home LAN. I have already tried stopping and starting sshd on the desktop. Any thoughts?

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  • tail -f and then exit on matching string

    - by Patrick
    I am trying to configure a startup script which will startup tomcat, monitor the catalina.out for the string "Server startup", and then run another process. I have been trying various combinations of tail -f with grep and awk, but haven't got anything working yet. The main issue I am having seems to be with forcing the tail to die after grep or awk have matched the string. I have simplified to the following test case. test.sh is listed below: #!/bin/sh rm -f child.out ./child.sh > child.out & tail -f child.out | grep -q B child.sh is listed below: #!/bin/sh echo A sleep 20 echo B echo C sleep 40 echo D The behavior I am seeing is that grep exits after 20 seconds , however the tail will take a further 40 seconds to die. I understand why this is happening - tail will only notice that the pipe is gone when it writes to it which only happens when data gets appended to the file. This is compounded by the fact that tail is to be buffering the data and outputting the B and C characters as a single write (I confirmed this by strace). I have attempted to fix that with solutions I found elsewhere, such as using unbuffer command, but that didn't help. Anybody got any ideas for how to get this working how I expect it? Or ideas for waiting for successful Tomcat start (thinking about waiting for a TCP port to know it has started, but suspect that will become more complex that what I am trying to do now). I have managed to get it working with awk doing a "killall tail" on match, but I am not happy with that solution. Note I am trying to get this to work on RHEL4.

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  • Linux buffer cache effect on IO writes?

    - by Patrick LeBoutillier
    Hi, I'm copying large files (3 x 30G) between 2 filesystems on a Linux server (kernel 2.6.37, 16 cores, 32G RAM) and I'm getting poor performance. I suspect that the usage of the buffer cache is killing the I/O performance. To try and narrow down the problem I used fio directly on the SAS disk to monitor the performance. Here is the output of 2 fio runs (the first with direct=1, the second one direct=0): Config: [test] rw=write blocksize=32k size=20G filename=/dev/sda # direct=1 Run 1: test: (g=0): rw=write, bs=32K-32K/32K-32K, ioengine=sync, iodepth=1 Starting 1 process Jobs: 1 (f=1): [W] [100.0% done] [0K/205M /s] [0/6K iops] [eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=4667 write: io=20,480MB, bw=199MB/s, iops=6,381, runt=102698msec clat (usec): min=104, max=13,388, avg=152.06, stdev=72.43 bw (KB/s) : min=192448, max=213824, per=100.01%, avg=204232.82, stdev=4084.67 cpu : usr=3.37%, sys=16.55%, ctx=655410, majf=0, minf=29 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued r/w: total=0/655360, short=0/0 lat (usec): 250=99.50%, 500=0.45%, 750=0.01%, 1000=0.01% lat (msec): 2=0.01%, 4=0.02%, 10=0.01%, 20=0.01% Run status group 0 (all jobs): WRITE: io=20,480MB, aggrb=199MB/s, minb=204MB/s, maxb=204MB/s, mint=102698msec, maxt=102698msec Disk stats (read/write): sda: ios=0/655238, merge=0/0, ticks=0/79552, in_queue=78640, util=76.55% Run 2: test: (g=0): rw=write, bs=32K-32K/32K-32K, ioengine=sync, iodepth=1 Starting 1 process Jobs: 1 (f=1): [W] [100.0% done] [0K/0K /s] [0/0 iops] [eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=4733 write: io=20,480MB, bw=91,265KB/s, iops=2,852, runt=229786msec clat (usec): min=16, max=127K, avg=349.53, stdev=4694.98 bw (KB/s) : min=56013, max=1390016, per=101.47%, avg=92607.31, stdev=167453.17 cpu : usr=0.41%, sys=6.93%, ctx=21128, majf=0, minf=33 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued r/w: total=0/655360, short=0/0 lat (usec): 20=5.53%, 50=93.89%, 100=0.02%, 250=0.01%, 500=0.01% lat (msec): 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.12% lat (msec): 100=0.38%, 250=0.04% Run status group 0 (all jobs): WRITE: io=20,480MB, aggrb=91,265KB/s, minb=93,455KB/s, maxb=93,455KB/s, mint=229786msec, maxt=229786msec Disk stats (read/write): sda: ios=8/79811, merge=7/7721388, ticks=9/32418456, in_queue=32471983, util=98.98% I'm not knowledgeable enough with fio to interpret the results, but I don't expect the overall performance using the buffer cache to be 50% less than with O_DIRECT. Can someone help me interpret the fio output? Are there any kernel tunings that could fix/minimize the problem? Thanks a lot,

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  • Log requests in apache upon arrival

    - by Patrick Cornelissen
    Is it possible to log requests in the apache when they arrive not when they have been processed? We have a pretty big web based application and the way it's currently logged is sometimes confusing to read, because each request with it's subrequests is logged "upside down", because apache logs the request after it has been processed, so the initial request is the last entry for this "query". We're wondering if there is a chance to log on arrival?!

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  • Why can't I install Java?

    - by Patrick
    I've been searching high and low for someone who can help me. I've been trying for a month. A month. to install Java on my new PC to no avail. No tech support forum can seem to help me. It all started while playing tekkit one day. I kept running out of memory (using the 32-bit JRE 7 u45) so I decided to install the 64-bit version. I uninstalled the 32-bit version first, for some reason, and downloaded the 64 bit runtime. In the installer, I go through all the normal screens until the installation progress bar appears. Then, it just sits there. No progress is made. No CPU is used by the installer, or any of its dependencies. The installer will stay like this for hours, days, and in one case a whole week without doing anything at all. I've tried installing older versions, the 32-bit version, even Java 6 and none of them will install. UAC is disabled, I've run regedit, CCleaner, and any other "fix-it" program there is. It's getting to the point where I may just have to wipe my hard drives and start over. I have several applications that require java, so this is an absolute necessity. Please, please, someone have the answer. Here are my system specs: -Intel i7-3770k -AsRock z77 Extreme3 -Samsung 840 pro SSD -WD Caviar Black 1tb

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  • Can I make Terminal.app open different profiles with shortcut like iTerm?

    - by Patrick
    I've been using iTerm for a while, but I switched back to Terminal.app in Snow Leopard due to the Visor plugin. Most of thing works pretty well after I switched to Terminal.app, except in iTerm, I can create different profiles and assign each profile with key shortcut. The advantage of this setup is that I can have non-transparency and transparency profile. If I need to look up a command on the background, I can start a transparency shell, and vice versa. I was thinking to use Mac built-in "Application shortcut" in System preference. Though, I realize in Terminal.app, the "New Window" and "New Tab" have the same profile names, so the Application shortcut is confused and I can't assign a shortcut to it... Any thought on how to change menu name on Terminal (or even better, any application?) Thanks for your help.

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  • Files on ext4 on Drobo with corrupt, zero-ed out blocks

    - by Patrick
    I have a 2TB ext4 file system (Ubuntu running Linux kernel 2.6.31-22-server x86_64). This file system is the second drive on a Drobo box plugged in via USB. We've not had problems on the first drive (Drobo limits drive size to 2TB due to some OS limitations, so if you have more space than that it appears as two separate drives). I am sharing this files with Samba (smbd 3.4.0) with a mix of Windows and Linux workstations. Recently we've been experiencing some data corruption in multiple files. In many cases I have an un-corrupt original file stored on one of the workstations. These are binary files of various formats, (e.g. SQLite, but others as well). I used "split" to split a corrupt and uncorrupt file into 4096 byte chunks (this is the block size of the ext4 file system). I then ran md5sum on pairs of chunks and discovered that the chunks matched in many cases and in every case where they did not match, the corrupt chunk was a solid chunk of zeroes (620f0b67a91f7f74151bc5be745b7110 for what it's worth). I'm trying to track down a culprit but am a bit at a loss. I don't believe Samba is at fault since I'm using it without issue on the first drive exported by the Drobo. What can I do to narrow this down and find out what's going on?

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  • Tool for viewing used and free memory on windows system

    - by patrick
    I'm looking for a tool that will allow me to see all of the memory used by by Windows XP/2003 machine. I know that Process Explorer and others will show you what memory is being used by each process, but I need a full graphical view of all used and unused memory on my machine. I have seen an app that does this but cannot remember the name. Anyone know of a tool like this?

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  • Connecting my XBOX 360 to home network

    - by patrick
    I am trying to set up my XBOX 360 as a Windows Media Center Extender. I input the code as shown on the XBOX screen, but I get the error message: "Cannot Set Up Extender." This means that the Extender was found (there's a separate error msg for extender not found), however it can't be set up. Windows points me to this page which tells me to change my router settings to enable multicast and UPnP. My router doesn't have those specific settings but I did open all ports for the XBOX. What is odd about this problem is that it did work, then I restarted my computer and didn't change any settings, and now it doesn't work. I guess something did change, but I can't figure out anything else to try after opening all ports. I'm running Windows 7 and the router is fairly recent (I bought it about six months ago) so it should be able to handle this. The router firmware is up to date.

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  • Finding ALL currently used IP addresses of Website

    - by Patrick R
    What steps would you take to discover all (or close to all) IP addresses that are currently used by a website? How would you be as exhaustive as possible without calling a website admin and asking for the list of IP addresses? ;) nslookup works but will vary based on dns server queried. whois is another good tool. Dig, not bad. Let's use Facebook for example. I'm blocking that site for the majority our our company's users, but some are approved for "research". I can not easily use OpenDNS because we all appear to come from the same request IP address. I could change that but don't want to add more vlans than I already have. I also could use block something like regex facebook1 "facebook\.com" (I'm running a cisco firewall) but that's pretty easy to sidestep. All that being said, I'm asking about specifically about finding ip addresses for a domain and not for other methods that I can block a domain name.

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  • AWS Linux EC2: yum won't run with plugins

    - by Patrick
    Short Version: yum commands on my Amazon Linux EC2 AMI only work with --noplugins. Long Version: A couple of days ago, I ran yum update at the behest of the SSH Login MoTD telling me I had updates to install. About midway through the update (specifically while updating the kernel), the update abruptly ended (79 of 138 items completed). The website I host on EC2 got weird for a few minutes, but eventually seemed to stabilize back out (maybe EC2 restarted itself?), and I didn't have further issues (other than MySQL started running out of memory, but I think that's probably unrelated to this). Today, I went to install gcc-c++ (with yum install gcc-c++). When I did, I got the following message: Loaded plugins: priorities, security, update-motd, upgrade-helper Config error: Command "updateinfo" already defined and I get that for any command I can think to run using yum. However, If I throw in the --noplugins flag, then magically it seems to work. To be clear, when I installed a different package a week ago, it worked totally correctly, so the yum update is the only thing I can think of that changed. I could find nothing on Google with regard to "updateinfo" already defined (with and without quotes). I tried running yum update --noplugins which spit out a message telling me that I should have run yum-complete-transaction instead, but proceeded to try to update something on its own. When that completed, I tried yum-complete-transaction but that gave me a message about the transactions not lining up correctly, so it removed the old transaction (Probably since I should have completed the first transaction before trying to update again, if I had known). Based on the SF question "Linux EC2 Broken Yum", I've also tried yum clean all --noplugins (fails the same with plugins) which just gives me Cleaning repos: amzn-main amzn-updates rpmforge Cleaning up everything I also tried package-cleanup --problems Loaded plugins: priorities, update-motd, upgrade-helper No Problems Found and package-cleanup --dupes Gives a lot of dupes, so I pasted them here: http://pastebin.com/VVFQEkTT instead of inline. At this point, I'm not sure what else there even is to check.

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  • Webserver logs: "Morfeus F***ing Scanner"

    - by Patrick
    I've just found these accesses in my web server log files: ::ffff:218.38.136.38 109.72.95.175 - [10/Jan/2011:02:54:12 +0100] "GET /user/soapCaller.bs HTTP/1.1" 404 345 "-" "Morfeus Fucking Scanner" ::ffff:218.38.136.38 109.72.95.174 - [10/Jan/2011:02:54:12 +0100] "GET /user/soapCaller.bs HTTP/1.1" 404 345 "-" "Morfeus Fucking Scanner" Should I start to worry ? Or is it just a normal attempt to hack my server ? thanks

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  • SFTP ChRoot result in broken pipe

    - by Patrick Pruneau
    I have a website that I want to add some restricted access to a sub-folder. For this, I've decided to use CHROOT with SFTP (I mostly followed this link : http://shapeshed.com/chroot_sftp_users_on_ubuntu_intrepid/) For now, I've created a user (sio2104) and a group (magento).After following the guide, my folder list look like this : -rw-r--r-- 1 root root 27 2012-02-01 14:23 index.html -rw-r--r-- 1 root root 21 2012-02-01 14:24 info.php drwx------ 15 root root 4096 2012-02-25 00:31 magento As you can see, i've chown root:root the folder magento I wanted to jail-in the user and ...everything else by the way. Also in the magento folder, I chown sio2104:magento everything so they can access what they want. Finally, I've added this to sshd_config file : #Subsystem sftp /usr/lib/openssh/sftp-server Subsystem sftp internal-sftp Match Group magento ChrootDirectory /usr/share/nginx/www/magento ForceCommand internal-sftp AllowTCPForwarding no X11Forwarding no PasswordAuthentication yes #UsePAM yes And the result is...well, I can enter my login, password and it's all finished with a "broken pipe" error. $ sftp [email protected] [....some debug....] [email protected]'s password: debug1: Authentication succeeded (password). Authenticated to 10.20.0.50 ([10.20.0.50]:22). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. Write failed: Broken pipe Connection closed Verbose mode gives nothing to help. Anyone have an idea of what I've done wrong? If I try to login with ssh or sftp with my personnal user, everything works fine.

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  • apache generating to many rotatelogs.exe on Windows?

    - by Patrick
    I'm seeing some odd behavior with Apache's rotatelogs.exe. On one of my servers I'm seeing multiple rotatelogs.exe counting into the 100's. Normally I usually only see 6 which I can rationalize to the 3 logs I have rotating. Does anyone know why this might be happening and how I can prevent it from happening. When the rotatelogs.exe processes get up into the 100's everything slows down and Apache is effectively shutdown because it can't process requests anymore. We are using the following line in our httpd.conf file: ErrorLog "|\"C:/Program Files/Apache2/bin/rotatelogs.exe\" \"C:/Program Files/Apache2/logs/error_log.%Y-%m-%d-%H_%M_%S\" 20M" Thanks in advance for the help!

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  • Network Printer installs driver every time i connect

    - by Patrick Schneider
    running a Citrix XenApp 6.5 Farm with a strange problem. Using Ricoh UPD 3.10 and every time a user log on into a Citrix Session and get the printers connected (via logon script) Windows shows the "Finishing installation..." dialog for every printer. The Drivers are installed on all Citrix Server and every time a user connects a printer the dialog appears. Are there any settings how to disable this behaviour?

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  • Webserver logs: "Morfeus Fucking Scanner"

    - by Patrick
    I've just found these accesses in my web server log files: ::ffff:218.38.136.38 109.72.95.175 - [10/Jan/2011:02:54:12 +0100] "GET /user/soapCaller.bs HTTP/1.1" 404 345 "-" "Morfeus Fucking Scanner" ::ffff:218.38.136.38 109.72.95.174 - [10/Jan/2011:02:54:12 +0100] "GET /user/soapCaller.bs HTTP/1.1" 404 345 "-" "Morfeus Fucking Scanner" Should I start to worry ? Or is it just a normal attempt to hack my server ? thanks

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  • Apple: Airport extreme, 3 questions

    - by Patrick
    1) Can I use airport extreme + external hard disk as a server ? I mean, can I run operating systems such as ubuntu on it ? 2) Is it a bit noisy ? Can I place it in my sleeping room ? 3) Can airport extreme expand networks ? On the Apple website they say only Time Capsule can do it: www.apple.com/wifi/ thanks

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  • Redirect to ADFS login

    - by Patrick
    My company has switched to Office 365 and we like it, but we would really like for the ADFS single sign on to be more simplified. We have to go to login.microsoftonline.com then type in the username, then you have to click the link that appears at the bottom. Then you have to type in your username again and password. So we have come up with the idea that we could just redirect everyone to this page, but after lots of research into this, it seems like it's not possible to do a DNS redirect to a path. Does anyone know any other type of redirect that we could try? I'm thinking about trying to see if I can have a DNS entry go to our TMG and then have the TMG redirect to a path. But I'm not sure how the ADFS server knows where to go after that, so it might just log us in and not go anywhere. Any help will be greatly appreciated.

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