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• QNTC and Windows Server 2008 R2

  - by Ben

  I am having a really hard time getting an iSeries (AS/400) machine talking to my new Windows Server 2008 R2 box using the QNTC file system on the iSeries. I had similar problems getting it to initially talk to a Windows Server 2003 machine, but enabling the local Guest account on the 2003 box solved that one. No such luck with the new 2008 box. When I do a WRKLNK /QNTC/SVR01 on the iSeries (which should show share listings, and does on any 2003 boxes) all I get is (Cannot find object to match specified name.). I know the iSeries likes the same username and password on the remote server, but unfortunately for us this is not the case. Anyhow, it does currently work with different username/password combinations on a 2003 box. To try and get the wretched things talking, I have made the 2008 server pretty open but the iSeries will not see shares on it. I have enabled the local Guest account, turned Windows firewall off, set the share permissions so Everyone has full control but to no avail. I read something on the internet about the iSeries only being able to handle NTLM authentication (and I understand by default that Server 2008 R2 only uses NTLMv2 and has NTLM disabled), so I made a special group policy for the server and tweaked all Group Policy settings under Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\Security Options but the iSeries STILL won't see it. We have a team of programmers who do all the system administration of the iSeries, but they are stumped for ideas on their side, and I'm stumped for ideas on my side. This is driving me crazy now, and if anybody has managed to get an iSeries to talk to Windows Server 2008 R2 using QNTC I would be very appreciative of any suggestions, be it on the Windows side, iSeries settings or even IBM PTF's that might patch anything. The iSeries is running V5R4 and I have *SECOFR privileges on it, if it helps. One final (most important!) note - The programmers think it's my system being tricky, and I think it's theirs - please prove me right :)

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• Nginx upload PUT and POST

  - by w00t

  I am trying to make nginx accept POST and PUT methods to upload files. I have compiled nginx_upload_module-2.2.0. I can't find any how to. I simply want to use only nginx for this, no reverse proxy, no other backend and no php. Is this achievable? this is my conf: nginx version: nginx/1.2.3TLS SNI support enabled configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-mail --with-mail_ssl_module --with-file-aio --with-ipv6 --with-cc-opt='-O2 -g' --add-module=/usr/src/nginx-1.2.3/nginx_upload_module-2.2.0 server { listen 80; server_name example.com; location / { root /html; autoindex on; } location /upload { root /html; autoindex on; upload_store /html/upload 1; upload_set_form_field $upload_field_name.name "$upload_file_name"; upload_set_form_field $upload_field_name.content_type "$upload_content_type"; upload_set_form_field $upload_field_name.path "$upload_tmp_path"; upload_aggregate_form_field "$upload_field_name.md5" "$upload_file_md5"; upload_aggregate_form_field "$upload_field_name.size" "$upload_file_size"; upload_pass_form_field "^submit$|^description$"; upload_cleanup 400 404 499 500-505; } } And as an upload form I'm trying to use the one listed at the end of this page: http://grid.net.ru/nginx/upload.en.html

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• ubuntu 9.10 cups server cupsd.conf

  - by aaron

  i have a cups server running on ubuntu 9.10 on my home network. right now i can access it at 192.168.1.101:631, but when i try to access it at myservername.local:631 i get a 400 Bad Request. here's the relevant section from my current cupsd.conf: ServerName 192.168.1.101 # Only listen for connections from the local machine. Listen localhost:631 Listen /var/run/cups/cups.sock # any of the below 'Listen' directives all yield the same result Listen 192.168.1.101:631 #Listen *:631 #Listen myservername.local:631 # Show shared printers on the local network. Browsing On BrowseOrder allow,deny BrowseAllow all BrowseLocalProtocols CUPS dnssd BrowseAddress 192.168.1.255 # Default authentication type, when authentication is required... DefaultAuthType Basic # Restrict access to the server... <Location /> Order deny,allow Deny from All Allow from 127.0.0.1 Allow from 192.168.1.* </Location> # Restrict access to the admin pages... <Location /admin> Order deny,allow Deny from All #Allow from 127.0.0.1 #Allow from 192.168.1.* </Location> # Restrict access to configuration files... <Location /admin/conf> AuthType Default Require user @SYSTEM Order deny,allow Deny from All #Allow from 127.0.0.1 #Allow from 192.168.1.* </Location> i get the following in /var/log/cups/error_log: E [03/Jan/2010:18:33:41 -0600] Request from "192.168.1.100" using invalid Host: field "myservername.local:631" what do i need to do to be able to access the cups server at both 192.168.1.101:631 and myservername.local:631?

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• AWStats consumes too much resource, how to disable temporarily

  - by trante

  For some days AWStats takes %10-%20 of my CPU, takes 400-550 MB RAM and works for hours. Maybe my site's traffic became larger so process time takes more time than before or some bugs in program makes this. Anyway I want to disable AWStats temporarily. Maybe I would want to activate it in future. I found that answer. But it gives commands to remove AWStats. I only want to disable it temporarily. My system is Centos 6.3, Plesk 11.5.30 Update #19. I tried to disable cron jobs. I run this # killall awstats.pl I opened # vi /etc/cron.daily/awstats file and I changed it to this: #!/bin/sh #/usr/share/awstats/awstats_updateall.pl now -awstatsprog=/var/www/cgi-bin/awstats/awstats.pl -configdir=/etc/awstats >/dev/null 2>&1 exit 0 After some time I still see that awstats is running. What should I do more to not to awstats run again ? But without removing my files. After changing " /etc/cron.daily/awstats" file awstats doesn't start in daytime. But every night in 03:15 awstats starts again. Because of Plesk auto updates are working at that time, I changed from Plesk. Don't auto update automatically. But it seems like last night at 03:15 awstats started again. Is there any way to stop awstats temporarily except this solution ? Because this solution deletes awstats configs permanently and I don't know how to revert it back in future ? Turn off all AWStats for Plesk 11+ domains #!/bin/bash for i in /var/www/vhosts/*; do echo "Turning off and deleting Stats for" echo `basename $i` /usr/local/psa/admin/bin/webstatmng --unset-configs --stat-prog=awstats --domain-name=`basename $i` /usr/local/psa/admin/bin/webstatmng --clean --stat-prog=awstats --domain-name=`basename $i` done

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• Puppet Agent fails sporadically, with either timeout or "Could not find class" error

  - by smokris

  I have puppet master running on a Xen dom0, and 3 domUs syncing to it via an hourly crontab puppet agent --test. About 80% of the time, the puppet agent --test completes successfully: info: Retrieving plugin info: Caching catalog for test3 info: Applying configuration version '1333319732' notice: Finished catalog run in 5.08 seconds The other 20% of the time, it fails midway, with errors such as the following: err: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not find class iptables for test1 at /etc/puppet/manifests/site.pp:1 on node test1 warning: Not using cache on failed catalog err: Could not retrieve catalog; skipping run or info: Retrieving plugin info: Caching catalog for test2 info: Applying configuration version '1333319732' notice: Finished catalog run in 24.73 seconds err: Could not send report: Error 500 on SERVER: Internal Server Error private method `gsub' called for WEBrick::HTTPStatus::RequestTimeout:Class WEBrick/1.3.1 (Ruby/1.8.5/2006-08-25) OpenSSL/0.9.8e-rhel5 at puppet:8140 or info: Retrieving plugin err: Could not retrieve catalog from remote server: execution expired warning: Not using cache on failed catalog err: Could not retrieve catalog; skipping run or info: Retrieving plugin info: Caching catalog for test3 info: Applying configuration version '1333319732' notice: Finished catalog run in 9.47 seconds err: Could not send report: Error 408 on SERVER: Request Timeout During this time, I've not made any changes to the Puppet configuration — it just sporadically fails. I'm running puppet-2.7.12 on CentOS, and followed the setup instructions described on http://docs.puppetlabs.com/learning/agent_master_basic.html. Any ideas about how I can troubleshoot this?

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• Hardware Requirements & Tuning - Flash Media Server 3.5 Interactive

  - by Anthony Kanago

  I am trying to spec out a server to purchase (physically, not rented from someone like softlayer.com) to run an intranet instace of Flash Media Server 3.5 Interactive. In general, the server will likely be fielding somewhere on the order of 400 connections at a time at the upper limit. Of course, should this increase, we don't want to be stuck. While the decision is not final, we will likely be running the server on Red Hat rather than Windows. The server will be run on gigabit ethernet. I have two related questions: What sort of hardware would I need realistically to support this? What advice can you offer for settings in tuning FMS/the OS to be performant to this level? We are looking for a bare minimum that will run this effectively to save on costs. Realistically, the average number of connections will be fairly low (50-150) by comparison with that upper limit estimate. To reiterate: we just want to be cautious in not getting caught when we need more power, but we also need a low-cost solution (doesn't everyone?) and that may take priority. Windows and RedHat are the two officially supported operating systems. Since FMS is stated to be 32-bit only, I'm sticking with a 32-bit OS. The hardware requirements listed by Adobe on their website are: 3.2GHz Intel® Pentium® 4 processor (dual Intel Xeon® or faster recommended) 2GB of RAM (4GB recommended) 1Gb Ethernet card So what realistically do I need for those sorts of connection numbers, and what can I due to tune things up to get more out of less hardware? Thanks!

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• Maximum RAM on Biostar P4M8PM7 Socket775 mATX board

  - by Alex Balashov

  I have a server with a Biostar P4M8PM7 ("Pro-M7") board based on a VIA chipset. It's a strange board to put in a server because it seems like more of a desktop board to me, but alas! It takes DDR2-667 (PC5300) RAM. What I can't figure out is the maximum amount I can put in it, as I cannot find the manual anywhere online. I've found a few marketing broadsheets from online retailers that say, "up to 2 GB of RAM!" but I am not sure whether to believe them. They also do not seem to be quite for the same board, as they indicate DDR2 400/533 RAM, for example: http://www.geeks.com/details.asp?invtid=P4M8P-M7. The manufacturer's web site says the same thing, but does not elaborate. It's a 64-bit CPU and board; is there a technical reason why the board would not be able to address more than 2 GB? Can someone tell me what sort of that reason that would be? I bought this server from someone really hoping I could put 8 to 16 in it, and wanted to do some research before I gave up. On a related note, it's not indicated anywhere whether it can take ECC RAM; the existing chips are not ECC, but most memory sold in the range I'm looking for (e.g. DIMMs with enough chip density to do 8 GB) seems to be server-class and for that reason ECC. Any ideas? Thank you very much for your consideration in advance!

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• How to access programs in one PC using another PC

  - by darkstar13

  Hi, I was recently given an old PC for my remote access at work. The CPU that comes with it has Windows XP installed, 400+ MB of ram, all USB devices disabled. I access my work applications using VPN / Citrix. Basically, it' sooooo slow. Plus it's bulky and it will just occupy space, so I am now hoping to find a way for me to integrate this work PC with my home PC. I tried to put in the hard drive in my home PC CPU, and set the drive as slave. However, when I booted my PC from this hard drive, I am stuck at the screen where windows is prompting me to select how am I going to boot (ex. Safe Mode, Safe mode with command prompt, Last Working Configuration, etc), but whatever option I select, I am still stuck at this option after reboot. I am thinking if maybe I can clone the drive and mount the cloned drive and access the system as a virtual machine. But I don't know if that will work. I would like to know if there's something I can do so I can work at home using my home PC, where I can access my work programs to connect to VPN / Citrix. My home PC's OS is Windows 7 Ultimate x64.

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• Backing up VMs to a tape drive

  - by Aljoscha Vollmerhaus

  I've got myself one of these fancy tape drives, HP LTO2 with 200/400 GB cartridges. The st driver reports it like this: scsi 1:0:0:0: Sequential-Access HP Ultrium 2-SCSI T65D I can store and retrieve files like a charm using tar, both tar cf /dev/st0 somedirectory and tar xf /dev/st0 work flawless. However, what I really would like to backup are LVM LVs. They contain entire virtual machines with varying partition layouts, so using mount and tar is not an option. I've tried using something like dd if=/dev/VG/LV bs=64k of=/dev/st0 to achieve this, but there seem to be various problems associated with this approach. Firstly, I would like to be able to store more than 1 LV on a single tape. Now I guess I could seek to concatenate the data on the tape, but I think this would not work very well in an automated scenario with many different LVs of various sizes. Secondly, I would like to store a small XML file along with the raw data that contains some information about the VM contained in the LV. I could dump everything to a directory and tar it up - not very desirable, I would have to set aside huge amounts of scratch space. Is there an easier way to achieve this? Thirdly, from googling around it seems like it would be wise to use something like mbuffer when writing to the tape, to prevent what wikipedia calls "shoe-shining" the tape. However, I can't get anything useful done with mbuffer. The mbuffer man page suggests this for writing to a tape device: mbuffer -t -m 10M -p 80 -f -o $TAPE So I've tried this: dd if=/dev/VG/LV | mbuffer -t -m 10M -p 80 -f -d 64k -o /dev/st0 Note the added "-d 64k" to account for the 64k block size of the tape. However, reading data back from a tape written in this way never seems to yield any useful results - dd has been running for ages now, and managed to transfer only 361M of data from the tape. What's wrong here?

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• stunnel client uses improper SNI when talking to Apache

  - by Huckle

  I have stunnel listening on port 80 and acting as a client connecting to Apache listening on port 443. Configuration is below. What I'm finding is that if I attempt to connect to localhost:80 the connection is fine but if I connect to 127.0.0.1:80 When I check Apache's logs it indicates that stunnel is using localhost as the SNI both times, but the HTTP request lists localhost in one case and 127.0.0.1 in another. Is it possible to tell stunnel to either use whatever is in the HTTP request or to somehow configure two clients each with different SNI values? stunnel.conf: debug = 7 options = NO_SSLv2 [xmlrpc-httpd] client = yes accept = 80 connect = 443 Apache error.log: [error] Hostname localhost provided via SNI and hostname 127.0.0.1 provided via HTTP are different Apache access.log: "GET / HTTP/1.1" 200 2138 "-" "Wget/1.13.4 (linux-gnu)" "GET / HTTP/1.1" 400 743 "-" "Wget/1.13.4 (linux-gnu)" wget: $wget -d localhost ---request begin--- GET / HTTP/1.1 User-Agent: Wget/1.13.4 (linux-gnu) Accept: */* Host: localhost Connection: Keep-Alive ---request end--- $wget -d 127.0.0.1 ---request begin--- GET / HTTP/1.1 User-Agent: Wget/1.13.4 (linux-gnu) Accept: */* Host: 127.0.0.1 Connection: Keep-Alive ---request end--- edit: Apache Config Nothing out of the ordinary, it's just a virtual host listening to 443 <VirtualHost *:443>

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• 613 threads limit on debian

  - by Joel

  When running this program thread-limit.c on my dedicated debian server, the output says that my system can't create more than around 600 threads. I need to create more threads, and fix my system misconfiguration. Here are a few informations about my dedicated server: de801:/# uname -a Linux de801.ispfr.net 2.6.18-028stab085.5 #1 SMP Thu Apr 14 15:06:33 MSD 2011 x86_64 GNU/Linux de801:/# java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) de801:/# ldd $(which java) linux-vdso.so.1 => (0x00007fffbc3fd000) libpthread.so.0 => /lib/libpthread.so.0 (0x00002af013225000) libjli.so => /usr/lib/jvm/java-6-sun-1.6.0.26/jre/bin/../lib/amd64/jli/libjli.so (0x00002af013441000) libdl.so.2 => /lib/libdl.so.2 (0x00002af01354b000) libc.so.6 => /lib/libc.so.6 (0x00002af013750000) /lib64/ld-linux-x86-64.so.2 (0x00002af013008000) de801:/# cat /proc/sys/kernel/threads-max 1589248 de801:/# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 794624 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 10240 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 128 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Here is the output of the C program de801:/test# ./thread-limit Creating threads ... Address of c = 1061520 KB Address of c = 1081300 KB Address of c = 1080904 KB Address of c = 1081168 KB Address of c = 1080508 KB Address of c = 1080640 KB Address of c = 1081432 KB Address of c = 1081036 KB Address of c = 1080772 KB 100 threads so far ... 200 threads so far ... 300 threads so far ... 400 threads so far ... 500 threads so far ... 600 threads so far ... Failed with return code 12 creating thread 637. Any ideas how to fix this please ?

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• django, mod_wsgi, MySQL High CPU - Problems

  - by Red Rover

  Good Evening, and thank you for reading this post. I am having a problem with Django after migrating the dB from SQLlite to MySQL. Initially, for the first 48hours, all ran well. But now we are experiencing high cpu about every 30 minutes. This is a production ESX4i VM host, with 2 x 2.8 ghz CPUs and 12 GB ram. I have allocated 4 cpu's to this VM and 4 GB memory. Any insight into this configuration and help with the spikes in CPU would be appreciated. IT is configured to use the prefork MPM. Outlined are the config's for the different services: MySQL Server version: 5.1.61 Source distribution Django 1.3 mod_wsgi Apache/2.2.15 httpd.conf Timeout 120 KeepAlive Off MaxKeepAliveRequests 400 KeepAliveTimeout 3 prefork MPM StartServers 8 MinSpareServers 8 MaxSpareServers 16 ServerLimit 40 MaxClients 40 MaxRequestsPerChild 0 worker MPM StartServers 16 MaxClients 1024 MinSpareThreads 64 MaxSpareThreads 256 ThreadsPerChild 64 MaxRequestsPerChild 10240 MySQL my.conf [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql symbolic-links=0 [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid my.cnf wsgi.conf LoadModule wsgi_module modules/mod_wsgi.so /etc/httpd/conf.d/wsgi.conf WSGISocketPrefix /var/run/wsgi WSGIPythonEggs /var/tmp WSGIDaemonProcess SITE maximum-requests=10000 WSGIProcessGroup SITE

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• How can i get more low memory with the following setup:

  - by user539484

  Modules using memory below 1 MB: Name Total = Conventional + Upper Memory -------- ---------------- ---------------- ---------------- MSDOS 14 317 (14K) 14 317 (14K) 0 (0K) HIMEM 1 120 (1K) 1 120 (1K) 0 (0K) EMM386 3 120 (3K) 3 120 (3K) 0 (0K) OAKCDROM 36 064 (35K) 36 064 (35K) 0 (0K) POWER 80 (0K) 80 (0K) 0 (0K) NLSFUNC 2 784 (3K) 2 784 (3K) 0 (0K) COMMAND 2 928 (3K) 2 928 (3K) 0 (0K) MSCDEX 15 712 (15K) 15 712 (15K) 0 (0K) SMARTDRV 30 384 (30K) 13 984 (14K) 16 400 (16K) KEYB 6 752 (7K) 6 752 (7K) 0 (0K) MOUSE 17 296 (17K) 17 296 (17K) 0 (0K) DISPLAY 8 336 (8K) 0 (0K) 8 336 (8K) SETVER 512 (1K) 0 (0K) 512 (1K) DOSKEY 4 144 (4K) 0 (0K) 4 144 (4K) POWER 4 672 (5K) 0 (0K) 4 672 (5K) Free 552 944 (540K) 539 088 (526K) 13 856 (14K) Memory Summary: Type of Memory Total = Used + Free ---------------- ---------- ---------- ---------- Conventional 653 312 114 224 539 088 Upper 47 920 34 064 13 856 Reserved 0 0 0 Extended (XMS)* 64 898 256 2 671 824 62 226 432 ---------------- ---------- ---------- ---------- Total memory 65 599 488 2 820 112 62 779 376 Total under 1 MB 701 232 148 288 552 944 Total Expanded (EMS) 33 947 648 (33 152K Free Expanded (EMS)* 33 538 048 (32 752K * EMM386 is using XMS memory to simulate EMS memory as needed. Free EMS memory may change as free XMS memory changes. Largest executable program size 538 976 (526K) Largest free upper memory block 7 488 (7K) MS-DOS is resident in the high memory area. I'm running MS-DOS 6.22 on VMWare virtual hardware. This is memory state after memmaker pass, so i'm looking for optimization beyond memmaker. Note: NLS drivers (DISPLAY, KEYB, NSLFUNC) are essential for me. Thanks to @mtone for valuable reminder about MSCDEX /E which gave me 16KiB of low memory (see the diff)!

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• exim4 redirect mail sent to *@domain1.example.com to *@domain2.example.com

  - by nightcoder

  Current situation: We have a VPS that hosts a website example.org. Exim is configured to work as a smarthost. All emails sent through exim are successfully relayed to another mail server (that is working on example.com). Goal: To forward mail sent to *@example.org to *@example.com, i.e. change the recipient's address from *@example.org to *@example.com. Problem: If I send email to address *@example.org, then it seems exim doesn't change the address, it still relays the message to another mail server but recipient is still *@example.org. Maybe the redirect is not applied for some reason. Configuration and logs: /etc/exim4/update-exim4.conf.conf: dc_eximconfig_configtype='smarthost' dc_other_hostnames='' dc_local_interfaces='' dc_readhost='example.org' dc_relay_domains='example.org' dc_minimaldns='false' dc_relay_nets='0.0.0.0/32' dc_smarthost='example.com::26' CFILEMODE='644' dc_use_split_config='false' dc_hide_mailname='true' dc_mailname_in_oh='true' dc_localdelivery='maildir_home' /etc/exim4/conf.d/router/999_exim4-config_redirect (created by me): domain_redirect: debug_print = "R: forward for $local_part@$domain" driver = redirect domains = example.org data = [email protected] (for now data is set to a specific address for simplicity and testing) exim log when sending email to [email protected] (should be redirected to [email protected]): 2012-03-20 19:40:07 1SA4ud-0005Dw-7k <= [email protected] U=www-data P=local S=657 2012-03-20 19:40:08 1SA4ud-0005Dw-7k => [email protected] R=smarthost T=remote_smtp_smarthost H=domain2.com [184.172.146.66] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,2.5.4.17=#13053737303932,ST=TX,L=Houston,STREET=Suite 400,STREET=11251 Northwest Freeway,O=HostGator.com,OU=HostGator.com,OU=Comodo PremiumSSL Wildcard,CN=*.hostgator.com" 2012-03-20 19:40:08 1SA4ud-0005Dw-7k Completed So, the address is not changed :( Please help! I'm trying to make it work for half a day already :(

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• Basic multicast network performance problems

  - by davedavedave

  I've been using mpong from 29west's mtools package to get some basic idea of multicast latency across various Cisco switches: 1Gb 2960G, 10Gb 4900M and 10Gb Nexus N5548P. The 1Gb is just for comparison. I have the following results for ~400 runs of mpong on each switch (sending 65536 "ping"-like messages to a receiver which then sends back -- all over multicast). Numbers are latencies measured in microseconds. Switch Average StdDev Min Max 2960 (1Gb) 109.68463 0.092816 109.4328 109.9464 4900M (10Gb) 705.52359 1.607976 703.7693 722.1514 NX 5548(10Gb) 58.563774 0.328242 57.77603 59.32207 The result for 4900M is very surprising. I've tried unicast ping and I see the 4900 has ~10us higher latency than the N5548P (average 73us vs 64us). Iperf (with no attempt to tune it) shows both 10Gb switches give me 9.4Gbps line speed. The two machines are connected to the same switch and we're not doing any multicast routing. OS is RHEL 6. 10Gb NICs are HP 10GbE PCI-E G2 Dual-port NICs (I believe they are rebranded Mellanox cards). The 4900 switch is used in a project with tight access control so I'm waiting for approval before I can access it and check the config. The other two I have full access to configure. I've looked at the Cisco document[2] detailing differences between NX-OS and IOS w.r.t multicast so I've got some ideas to try out but this isn't an area where I have much expertise. Does anyone have any idea what I should be looking at once I get access to the switch? [1] http://docwiki.cisco.com/wiki/Cisco_NX-OS/IOS_Multicast_Comparison

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• CSS gradient not rendering in Windows Phone 8 WebBrowser Control

  - by SRSHawk

  I am facing an issue where, the CSS3 background is not rendered in WebBrowser control in Windows Phone 8. But same HTML when opened in WebBrowser in Windows Phone 8, it renders the gradient The HTML I am using is: <html> <head> <meta name="viewport" content="width=320, user-scalable=no, minimum-scale=1, maximum-scale=1"/> </head> <body style="margin:0px;overflow:hidden;"> <div id="im_c" style="height:48px;width:100%25; background: -ms-linear-gradient( bottom, #432100 30%, #00AAAA 70%);"> <div style="margin:0 auto;width:320px;"> Test </div> </div> <style> body {margin:0px} </style> </body> In Windows Phone 8, I use the HTML as below: WebBroswer WebView = new WebBrowser(); WebView.Height = 100; WebView.Width = 400; WebView.NavigateToString(@"<html><head><meta name=""viewport"" content=""width=320, user-scalable=no, minimum-scale=1, maximum-scale=1""/></head><body style=""margin:0px;overflow:hidden;""> <div id=""im_c"" style=""height:48px;width:100%25; background: -ms-linear-gradient( bottom, #432100 30%, #00AAAA 70%);""> <div style=""margin:0 auto;width:320px;"">Test</div></div> <style> body {margin:0px} </style> </body></html>"); In this case, the CSS gradient is not visible. Am I missing something?

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• COMPAQ Tower No Signal to monitor

  - by Lancelot

  Hi there, I have had some troubles with this: I received a compaq tower: Compaq Presario SR1224NX Onboard VGA Windows XP SP2 from a friend. It was given to me on condition i give her the files back. My plan was to turn this into an Ubuntu Server. It booted up no problems even with the ubuntu live disc. After a normal shutdown(not unpluggin the power cord and not doing a hard shutdown with the power button), it would not restart even after SEVERAL attempts. I realized the light next to the power supply would flash very rapidly. I researched and found out it was one of two things: a dead power supply or the cables to the motherboard and to the disks etc. Thus i checked to ensure the cables were fine(and they were). I purchased a Power Supply (this one has 400 watts, the initial had 250) and installed it. The tower now boots. It booted into the live disk and everything. After a normal shutdown, it now restarts but is not sending signal to my monitor. I have tried several monitors in which i assure work perfectly but not with this tower(i recall it did show display after replacing the power supply). The monitors are ACER. This is different than most "no Signal" problems since i am not using an external Video Card, this is onboard VGA. Thanks!

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• Batch deletion of smaller files from group of files via unix command line

  - by artlung

  I have a large number (more than 400) of directories full of photos. What I want to do is to keep the larger sizes of these photos. Each directory has 31 to 66 files in it. Each directory has thumbnails, and larger versions, plus a file called example.jpg I dispatched the example.jpg file easily with: rm */example.jpg I initially thought that it would be easy to delete the thumbnails, but the problem is they are not consistently named. The typical pattern was photo1.jpg and photo1s.jpg. I did rm */photo*s.jpg but it ended up some of the files named photoXs.jpg were actually larger and not smaller. Argh. So what I want to do is scan each directory for filesize and delete (or move) the thumbnails. I initially thought I'd just ls -R every file and extract the size of each file and save those under a threshold. The problem? In one directory the large will be 1.1 MB and the thumb is 200k. In another the large is 200k and the small 30k. Even worse, the files really are mostly named photo1.jpg - so simply putting them all in the same folder, sorting by size, and deleting in groups would not work without renaming already, and if it's possible I'd prefer to keep them in their folders. I was almost resolved to just doing this all manually, but then thought I'd ask here. How would you do this task?

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• Increasing Java's heapspace in Tomcat startup script

  - by Ankur

  I want to increase my heap size when using Tomcat. I was told to add this line export CATALINA_OPTS=-Xms16m -Xmx256m; In to the startup.sh script - I did so (at the beginning) but got the error export: 24: -Xmx256m: bad variable name Where am I supposed to add it, am I doing something else wrong? <b>export CATALINA_OPTS=-Xms16m -Xmx256m;</b> # Better OS/400 detection: see Bugzilla 31132 os400=false darwin=false case "`uname`" in CYGWIN*) cygwin=true;; OS400*) os400=true;; Darwin*) darwin=true;; esac # resolve links - $0 may be a softlink PRG="$0" while [ -h "$PRG" ] ; do ls=`ls -ld "$PRG"` link=`expr "$ls" : '.*-> \(.*\)$'` if expr "$link" : '/.*' > /dev/null; then PRG="$link" else PRG=`dirname "$PRG"`/"$link" fi done PRGDIR=`dirname "$PRG"` EXECUTABLE=catalina.sh # Check that target executable exists if $os400; then # -x will Only work on the os400 if the files are: # 1. owned by the user # 2. owned by the PRIMARY group of the user # this will not work if the user belongs in secondary groups eval else if [ ! -x "$PRGDIR"/"$EXECUTABLE" ]; then echo "Cannot find $PRGDIR/$EXECUTABLE" echo "This file is needed to run this program" exit 1 fi fi exec "$PRGDIR"/"$EXECUTABLE" start "$@"

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• Invalid Parameter on node puppet

  - by chandank

  I am getting an error of err: Could not retrieve catalog from remote server: Error 400 on SERVER: Invalid parameter port at /etc/puppet/manifests/nodes/node.pp:652 on node test-puppet My puppet class: (The Line 652 at node.pp) node 'test-puppet' { class { 'syslog_ng': host => "newhost", ip => "192.168.1.10", port => "1999", logfile => "/var/log/test.log", } } On the module side class syslog_ng::config ( $host , $ip , $port, $logfile){ file {'/etc/syslog-ng/syslog-ng.conf': ensure => present, owner => 'root', group => 'root', content => template('syslog-ng/syslog-ng.conf.erb'), notify => Service['syslog-ng'], require => Class['syslog_ng::install'], } file {"/etc/syslog-ng/conf/${host}.conf": ensure => present, owner => 'root', group => 'root', notify => Service['syslog-ng'], content => template("syslog-ng/${host}.conf.erb"), require => Class['syslog_ng::install'], } } I think I am doing it as per the puppet documentation.

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• What's wrong with this HTTP POST request?

  - by bigboy

  I'm trying to fuzz a server using the Sulley fuzzing framework. I observe the following stream in Wireshark. The error talks about a problem with JSON parsing, however, when I try the same HTTP POST request using Google Chrome's Postman extension, it succeeds. Can anyone please explain what could be wrong about this HTTP POST request? The JSON seems valid. POST /restconf/config HTTP/1.1 Host: 127.0.0.1:8080 Accept: */* Content-Type: application/yang.data+json { "toaster:toaster" : { "toaster:toasterManufacturer" : "Geqq", "toaster:toasterModelNumber" : "asaxc", "toaster:toasterStatus" : "_." }} HTTP/1.1 400 Bad Request Server: Apache-Coyote/1.1 Content-Type: */* Transfer-Encoding: chunked Date: Sat, 07 Jun 2014 05:26:35 GMT Connection: close 152 <?xml version="1.0" encoding="UTF-8" standalone="no"?> <errors xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf"> <error> <error-type>protocol</error-type> <error-tag>malformed-message</error-tag> <error-message>Error parsing input: Root element of Json has to be Object</error-message> </error> </errors> 0

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• Windows 7 network performance tuning for LAN

  - by Hubert Kario

  I want to tune Windows 7 TCP stack for speed in a LAN environment. Bit of background info: I've got a Citrix XenServer set up with Windows 2008R2, Windows 7 and Debian Lenny with Citrix kernel, Windows machines have Tools installed the iperf server process is running on different host, also Debian Lenny. The servers are otherwise idle, tests were repeated few times to confirm results. While testing with iperf 2008R2 can achieve around 600-700Mbps with no tuning what so ever but I can't find any guide or set of parameters that will make Windows 7 achieve anything over 150Mbps with no change in TCP window size using -w parameter to iperf. I tried using netsh autotuining to disabled, experimental, normal and highlyrestricted - no change. Changing congestionprovider doesn't do anything, just as rss and chimney. Setting all the available settings to same values as on Windows 2008R2 host doesn't help. To summarize: Windows 2008R2 default settings: 600-700Mbps Debian, default settings: 600Mbps Windows 7 default settings: 120Mbps Windows 7 default, iperf -w 65536: 400-500Mbps While the missing 400Mbps in performance I blame on crappy Realtek NIC in the XenServer host (I can do ~980Mbps from my laptop to the iperf server) it doesn't explain why Windows 7 can't achieve good performance without manually tuning window size at the application level. So, how to tune Windows 7?

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• How to populate RRD database with CPU and MEM usage data?

  - by Tomaszs

  I have a Lighttpd server (on Centos) and would like to display 4 graphs: lighttpd traffic, lighttpd requests per second, CPU usage and MEM usage. I've set place for rrd database for lighttpd config like this: rrdtool.binary = "/usr/bin/rrdtool" rrdtool.db-name = "/var/www/lighttpd.rrd" And put into my WWW cgi-bin sh file that gets data from lighttpd RRD file and creates graphs of traffic and requests per second like this: #!/bin/sh RRDTOOL=/usr/bin/rrdtool OUTDIR=//var/www/graphs INFILE=/var/www/lighttpd.rrd OUTPRE=lighttpd-traffic WIDTH=400 HEIGHT=100 DISP="-v bytes --title TrafficWebserver \ DEF:binraw=$INFILE:InOctets:AVERAGE \ DEF:binmaxraw=$INFILE:InOctets:MAX \ DEF:binminraw=$INFILE:InOctets:MIN \ DEF:bout=$INFILE:OutOctets:AVERAGE \ DEF:boutmax=$INFILE:OutOctets:MAX \ DEF:boutmin=$INFILE:OutOctets:MIN \ CDEF:bin=binraw,-1,* \ CDEF:binmax=binmaxraw,-1,* \ CDEF:binmin=binminraw,-1,* \ CDEF:binminmax=binmaxraw,binminraw,- \ CDEF:boutminmax=boutmax,boutmin,- \ AREA:binmin#ffffff: \ STACK:binmax#f00000: \ LINE1:binmin#a0a0a0: \ LINE1:binmax#a0a0a0: \ LINE2:bin#efb71d:incoming \ GPRINT:bin:MIN:%.2lf \ GPRINT:bin:AVERAGE:%.2lf \ GPRINT:bin:MAX:%.2lf \ AREA:boutmin#ffffff: \ STACK:boutminmax#00f000: \ LINE1:boutmin#a0a0a0: \ LINE1:boutmax#a0a0a0: \ LINE2:bout#a0a735:outgoing \ GPRINT:bout:MIN:%.2lf \ GPRINT:bout:AVERAGE:%.2lf \ GPRINT:bout:MAX:%.2lf \ " $RRDTOOL graph $OUTDIR/$OUTPRE-hour.png -a PNG --start -14400 $DISP -w $WIDTH -h $HEIGHT $RRDTOOL graph $OUTDIR/$OUTPRE-day.png -a PNG --start -86400 $DISP -w $WIDTH -h $HEIGHT $RRDTOOL graph $OUTDIR/$OUTPRE-month.png -a PNG --start -2592000 $DISP -w $WIDTH -h $HEIGHT OUTPRE=lighttpd-requests DISP="-v req --title RequestsperSecond -u 1 \ DEF:req=$INFILE:Requests:AVERAGE \ DEF:reqmax=$INFILE:Requests:MAX \ DEF:reqmin=$INFILE:Requests:MIN \ CDEF:reqminmax=reqmax,reqmin,- \ AREA:reqmin#ffffff: \ STACK:reqminmax#00f000: \ LINE1:reqmin#a0a0a0: \ LINE1:reqmax#a0a0a0: \ LINE2:req#00a735:requests" $RRDTOOL graph $OUTDIR/$OUTPRE-hour.png -a PNG --start -14400 $DISP -w $WIDTH -h $HEIGHT $RRDTOOL graph $OUTDIR/$OUTPRE-day.png -a PNG --start -86400 $DISP -w $WIDTH -h $HEIGHT $RRDTOOL graph $OUTDIR/$OUTPRE-month.png -a PNG --start -2592000 $DISP -w $WIDTH -h $HEIGHT Basically it's not my script, i get it from somewhere from the internet. Now i would like to do the same for CPU usage and MEM usage. I don't like to use any additional packages! As you can see lighttpd populates lighttpd.rrd file with traffic data and requests per second. Now i would like to the system to populate second rrd file with CPU and MEM usage, so i can add to sh file code to generate graphs for this data. How can I populate RRD file with CPU and MEM usage data? Please, NO THIRD-PARTY tools !

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• Viability of Apache (MPM Worker), FastCGI PHP 4/5.2/5.3, and MySQL 5

  - by Adrian

  My server will be hosting numerous PHP web applications ranging from Joomla, Drupal, and some legacy (read: PHP4) and other custom-built code inherited from clients. This will be a development machine used by a dozen or so web developers and issues like fluctuating loads or particularly high load expectations are not important. Now, my question: are there any concerns I should know about when using Apache w/ MPM Worker, PHP 4/PHP 5.2/PHP 5.3 (all via FastCGI), and MySQL 5 (with a query cache of 64MB)? I have not tested the various applications extensively and I have only recently learned how to install PHP and utilize it via FastCGI (rather than mod_php, which in this case seemed impossible (considering the multiple versions of PHP and the desire to use MPM Worker over MPM Prefork)). I have come to understand that there could be concerns regarding XCache and APC, namely non-thread-safety issues where data becomes corrupted and the capability to use MPM Worker becomes null and void. Is this a valid concern? I have been using my personal testing server (running Ubuntu Server Edition 10.04 in VirtualBox) which has 2GB of RAM available to it. Here is the configuration used (the actual server will likely use a configuration more tailored to suit it's purposes): Apache: Server version: Apache/2.2.14 (Ubuntu) Server built: Apr 13 2010 20:22:19 Server's Module Magic Number: 20051115:23 Server loaded: APR 1.3.8, APR-Util 1.3.9 Compiled using: APR 1.3.8, APR-Util 1.3.9 Architecture: 64-bit Server MPM: Worker threaded: yes (fixed thread count) forked: yes (variable process count) Worker: <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 400 MaxRequestsPerChild 2000 </IfModule> PHP ./configure (PHP 4.4.9, PHP 5.2.13, PHP 5.3.2): --enable-bcmath \ --enable-calendar \ --enable-exif \ --enable-ftp \ --enable-mbstring \ --enable-pcntl \ --enable-soap \ --enable-sockets \ --enable-sqlite-utf8 \ --enable-wddx \ --enable-zip \ --enable-fastcgi \ --with-zlib \ --with-gettext \ Apache php-fastcgi-setup.conf FastCgiServer /var/www/cgi-bin/php-cgi-5.3.2 FastCgiServer /var/www/cgi-bin/php-cgi-5.2.13 FastCgiServer /var/www/cgi-bin/php-cgi-4.4.9 ScriptAlias /cgi-bin-php/ /var/www/cgi-bin/

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• Printing to a remote printer through the internet

  - by Lock

  I have a remote network (A) that is connected to a head office (B) through a private network. Network A only has 1 PC that requires the connection, and this is into a terminal server at network B. We want to save money by getting rid of the private network as only 1 PC now access it and it seems silly to pay ~$400 per month for something that is accessed by 1 PC. A VPN tunnel is out of the question as the provider wants to charge $600 a month for a VPN tunnel (more than a private network? I might get them to check these numbers). I was thinking of 2 options: 1) VPN client on the PC. This wouldn't cost a thing as we already have VPN users available. 2) Open up a port on the firewall of network B, forwarding to the terminal server. Now the problem is this: On the terminal server, the program that is accessed is for printing labels to the printer that is at network A. The program is setup to send all print jobs to a printer that is setup locally on the terminal server, which has its port mapped to the IP address of the printer that is at network A. If we got rid of the VPN tunnel and used clients/open up firewall port, the printer would no longer be able to find network A, and hence printing would not work. Any ideas to combat this issue? Can the printers at the remote network be setup as internet printers? I've never had any experience with internet printers. Can you open up ports and map to a public static IP address?

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