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• Difference between tcp recv buffer and tcp receive window size?

  - by pradeepchhetri

  The command shows the tcp receive buffer size in bytes. $ cat /proc/sys/net/ipv4/tcp_rmem 4096 87380 4001344 where the three values signifies the min, default and max values respectively. Then I tried to find the tcp window size using tcpdump command. $ sudo tcpdump -n -i eth0 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn and port 80 and host google.com' tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 16:15:41.465037 IP 172.16.31.141.51614 > 74.125.236.73.80: Flags [S], seq 3661804272, win 14600, options [mss 1460,sackOK,TS val 4452053 ecr 0,nop,wscale 6], length 0 I got the window size to be 14600 which is 10 times the size of MSS. Can anyone please tell me the relationship between the two.

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• Connection Reset by Peer error with Apache and JBoss 7.1.1

  - by vikingz

  We are seeing errors on some of our QA testing scripts that intermittently throw Connection Reset By Peer errors. The Test scripts submit requests via F5 which forwards requests to Apache (2.2.21) with a mod_jk load_balancer with the following setting for each worker in the worker.property worker1 props worker.worker1.type=ajp13 worker.worker1.port=8109 worker.worker1.lbfactor=1 worker.worker1.host=skunkhost1.com worker.worker1.connection_pool_timeout=30 and here is what is in the JBoss domain.xml for the AJP port from JBoss 7.1.1 <unbounded-queue-thread-pool name="SKUNKY.APP.AJP"> <max-threads count="300"/> <keepalive-time time="3" unit="minutes"/> </unbounded-queue-thread-pool> Here is httpd.conf Timeout 300 KeepAlive On KeepAliveTimeout 15 MaxKeepAliveRequests 100 TraceEnable Off My question is that is it posisbe that apache times out and closes the connection while jboss is still ready and working on the request? What might be causing the Connection Reset By Peer error?what am i missing here? Any help is majorly appreciated!! Sincerely KK

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• Puppet apache module causing 'Error 400 on SERVER: Invalid parameter identifier'

  - by Andy Shinn

  I am receiving the following error when trying to use the latest puppetlabs-apache module from github (https://github.com/puppetlabs/puppetlabs-apache): Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Invalid parameter identifier at /etc/puppet/environments/apache_update/modules/apache/manifests/mod.pp:40 on node zordon.mydomain.com Warning: Not using cache on failed catalog Error: Could not retrieve catalog; skipping run My node config looks like: node 'zordon.mydomain.com' { include template::common include template::puppetagent include template::lamp User::Create sudo::conf { 'joe': priority = 60, content = 'joe ALL=(ALL) NOPASSWD: ALL', require = User::Create['joe'], } } The template::lamp class is what uses apache module: class template::lamp { include myfirewall Firewall Firewall class { 'apache': } class { 'apache::mod::php': } class { 'apache::mod::ssl': } class { 'mysql::server': } } It looks like serverfault markup is getting garbled on Puppet realize statements. The User::Create and Firewall lines are just realizing a user and 2 firewall rules. I have verified that the /var/lib/puppet/lib/puppet/type/a2mod.rb type has the identifier parameter and it is the same MD5 as the server. I am using Puppet 3.0.1 on both agent and master. Any idea what may cause this?

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• Debian date jumping, causing complete lockup

  - by artfulrobot

  I have a Debian Squeeze VM that has suddenly chosen to jump it's date forwards just over a month, which seems to confuse it no end and cause it to require a hard reset (yikes!). There is nothing unusual in the logs, except that the datestamp suddenly jumps (today back to 2005). It's happened three times, so I don't think it's to do with the leap second issue as the last one of those was in July. When it happened once I spent ages checking stuff but could not find anything, decided to forget it. But three times is becoming an issue on a production server. Edits providing information requested in comments (thanks!): I do not have control over the hypervisor, it is a hired VM. # cat /sys/devices/system/clocksource/clocksource0/current_clocksource kvm-clock # ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== +grendel.exizten 130.149.17.8 2 u 29 64 77 14.811 1.778 1.744 *panoramix.linoc 193.67.79.202 2 u 32 64 77 19.729 -0.419 1.691 +robert.elnounch 213.251.128.249 2 u 27 64 77 17.762 0.600 1.722 -janetzki.eu 83.169.43.165 3 u 31 64 77 27.214 3.575 1.638

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• NginX & PHP-FPM, random 502.

  - by pestaa

  2010/09/19 14:52:07 [error] 1419#0: *10220 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: [...], server: [...], request: "POST /[...] HTTP/1.1", upstream: "fastcgi://unix:/server/php-fpm.sock:", host: "[...]", referrer: "[...]" This is the error I'm receiving randomly. 95% of the time my setup works perfectly, but once in a while I'm getting 502 for 3-4 subsequent requests. I'm using Unix socket between the server and the PHP process as you can see, also have set up FastCGI params (SCRIPT_FILENAME), etc. correctly. What can I do about it to strengthen the connection between these services? Thank you very much in advance.

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• Are there any HTPC-optimized web browsers?

  - by smackfu

  Features that I would ideally include in "HTPC-optimized": Full-screen. Navigable using a remote or the keyboard arrows. Legible at couch distances. Or, to put it another way, imagine the design requirements for Hulu Desktop or XBMC or WMC, applied to a web browser. Opera on a Wii meets most of these criteria but not being HD wastes a lot of potential. If a single solution doesn't exist, is there some combination of Firefox add-ons that will get me there?

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• Why is ntpd not updating the time on my server?

  - by John

  I have ntpd running on my server. It's all the default settings, except I commented out its ability to be a server to other machines: # restrict -4 default kod notrap nomodify nopeer noquery # restrict -6 default kod notrap nomodify nopeer noquery restrict default ignore If I run ntpdate -q ntp.ubuntu.com, I'm told that my machine's clock is off by 7 seconds. What's going on? How can I diagnose what's happening, is there a log I can turn on? more info #1 # ntpq -np remote refid st t when poll reach delay offset jitter ============================================================================== 91.189.94.4 193.79.237.14 2 u 30 64 7 108.518 -0.136 0.361 more info #2 Here's what this looked like when I asked the question: # ntpdate -q ntp.ubuntu.com server 91.189.94.4, stratum 2, offset 7.191308, delay 0.13310 10 Jan 20:38:09 ntpdate[31055]: step time server 91.189.94.4 offset 7.191308 sec And here's what it looks like now, after restarting ntpd a couple times (I'm assuming that's what fixed it): # ntpdate -q ntp.ubuntu.com server 91.189.94.4, stratum 2, offset 0.000112, delay 0.13164 10 Jan 20:47:03 ntpdate[31419]: adjust time server 91.189.94.4 offset 0.000112 sec

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• (Open Source) Cloud-Filesystem to run a Database on Top?

  - by jens

  Hello, what are current "technologies and implementations" to get a filesystem with unlimited capacity by using single servers with their harddisk to form a "grid/cloud filesystem"? I need to have unlimited space (by adding further servers) but it must be a filesysem that is capable of running a database on top. I know of Apache Hadoop but that seems not be be Ideal for running a DB on top of it (or am I wrong??) And iSCSI seems to be "remote/networked" but I do not know how and if this is clusterable? thank you very much!! jens

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• (Open Source) Cloud-Filesystem to run a Database on Top?

  - by jens

  Hello, what are current "technologies and implementations" to get a filesystem with unlimited capacity by using single servers with their harddisk to form a "grid/cloud filesystem"? I need to have unlimited space (by adding further servers) but it must be a filesysem that is capable of running a database on top. I know of Apache Hadoop but that seems not be be Ideal for running a DB on top of it (or am I wrong??) And iSCSI seems to be "remote/networked" but I do not know how and if this is clusterable? thank you very much!! jens

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• Nginx and Tomcat 6 proxy pass

  - by Patrick Schneider

  i've got problems tp configure nginx as reverse proxy for an tomcat application. I want to set domain www.example.com/blog to pass to an tomcat application. nginx-site: server { listen 80; servername example.com; location /blog { proxy_pass http://localhost:8080/blog; proxy_redirect off; } } Now when i call on my browser http://example.com/blog it redirects to localhost/blog which does not work. curl http://localhost:8080/blog -H "host: example.com/blog" -v shows a 302 to localhost/blog Any ideas?

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• Game Server Colocation

  - by Linuz

  Hello, I am new to colocation. I am looking for a good place to host my server that would have around 5-10 Source Servers (Team Fortress 2). I am looking at maybe around 90 players at a time for now, players coming from all over the United States Could I get more info on what I am suppose to look for exactly? Would it be correct for me to get a 100Mb/s line and does 100Mb/s line in the following example actually be 100Mb/s upload bandwidth? Example: package 4 of FDC's services: http://www.fdcservers.net/server_colocation.php also I want to get something unmettered. I do not want to have to ever worry about going over some bandwidth limit or any DDOS attacks killing me. And if anyone has any other recommendations as to what network configurations I should get or any other good colocation providers that are cheap in price, I would REALLY appreciate the help. Thanks

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• Stop a particular key getting captured by rdesktop

  - by user18151

  Hello, I want F12 to be not capture by my rdesktop while in fullscreen, so that I can do whatever stuff I'm doing on my remote Windows computer, but pressing F12 would bring down yakuake, and I can type down my commands, or use vim etc for whatever I'm doing. Is there any possible way to do this? I tried playing with keymaps, but that didn't help. I set F12 to inhibit, but that seems to have stopped sending F12 altogether, rather than let gnome catch it and let yakuake pop up. Would be really grateful for answers. I am ready to do my homework, if someone could please just give me pointers etc. Thanks :). Sidenote: My current arranement stems from my large monitor in lab, and small personal laptop monitor, and the laptop has Windows 7. My lab computer has Linux, on which I do my coding work.

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• How can I share a video file during a webinar?

  - by Brien Malone

  Here is the scenario: I have a number of remote employees around the globe. I want to have a video chatting session. No problem there. Halfway through, I want to shut off all camera video feeds and simulcast (synchronous) a training video to my team. How do I do this? We have tried office communicator, but the frame rate was awful and no audio. Adobe Connect had similar trouble. In both cases we were limited by the main office's small internet pipe, but it is clear that video delivered by shared desktop is not a good solution.

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• Dummy HTTP server for debugging

  - by Andrea

  This is more or less the inverse of my previous question. I need to debug some HTTP requests that I am making. Since these requests arise from the use of some external libraries, sometimes I am not sure of what is the actual data I am sending. Is there some dummy server (for Linux) that accepts HTTP requests and just prints them somewhere so that I can inspect them? I would like to be able to see in plain text the full request, like POST /foo HTTP/1.1 Host: www.example.com Accept: text/xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-gb,en;q=0.5 Content-Type: text/plain Content-Length: 11 Hello world

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• Are periodic full backups really necessary on an incremental backup setup?

  - by user2229980

  I intend to use an old computer I have as a remote backup server for myself and a few other people. We are all geographically separated, and the plan is to do incremental daily backups using rsync and ssh. My original idea was to make one initial full backup then never again have to deal with the overhead of doing it, and from that moment on only copy the files changed since the last backup. I've been told that this could be bad, but I fail to understand why. Since each snapshot is comprised of hard links to the unchanged files plus the original changed ones, isn't it going to be identical to a new full backup? Why would I want to make another full backup?

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• reverse nslookup fails for single machine

  - by matt wilkie

  I have a computer on a windows Active Directory network for which reverse dns lookup fails. It doesn't matter which machine runs the lookup. The problem computer is a debian vm on a windows server 2003 host. >nslookup wiki.dept Server: primary.internal.domain.org Address: 192.111.222.44 Name: wiki.dept.internal.domain.org Address: 192.111.111.185 >nslookup 192.111.111.185 Server: primary.internal.domain.org Address: 192.111.222.44 *** primary.internal.domain.org can't find 192.111.111.185: Non-existent domain Contents of /etc/resolv.conf on the debian guest: nameserver 192.111.111.244 nameserver 192.111.222.44 search internal.domain.org What is wrong? how do I get ip-to-name resolution to work for this machine? Thank you.

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• nginx www.domain.com vs domain.com virtualhost

  - by m33lky

  I have an http block where I include virtual hosts for the different domains hosted on the same server. For each virtual host I do: listen domain.com:80; Now, domain2.com works fine. However, when I do www.domain2.com it shows the page for domain1.com! How to properly configure nginx? Does this have something to do whether www is a CNAME or an A record? Update: It looks like you can do the following: listen 80; server_name domain.com www.domain.com;

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• Apache mod_proxy parameters

  - by mike

  Hi! I have a machine running Apache with mod_proxy that I'm using to proxy a local Tomcat server running on another port. The problem is that Tomcat does not support wildcard sub-domains(whole reason for using apache/mod_proxy) and our app uses the subdomain to figure out what account the data should come from. So with that said, is there a way to pass the subdomain as a url parameter via mod_proxy? For example, I have this: ProxyPass / http://example.com:8080/ In a virtual host block and I can access the site from any subdomain. Would is be possible to do something like: ProxyPass / http://example.com:8080/?subdomain=the_sub_domain_requested Thanks for any and all help... Mike

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• Puppet master/agent basic setup

  - by lewap

  I'm trying to setup a basic puppet agent/master use-case with an agent server and a master. I've setup two servers with puppet and puppet master respectively. After the following setup of both servers: puppet master --no-daemonize --verbose puppet agent --test puppet cert --list to get the list, puppet cert --sign to sign it. puppet agent --test I get the message: err: Could not retrieve catalog from remote server: hostname was not match with the server certificate warning: Not using cache on failed catalog err: Could not retrieve catalog; skipping run err: Could not send report: hostname was not match with the server certificate What do I need to do in order to get the agent/master to be able to talk to each other?

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• Crossover cable in addition to normal network connection on servers?

  - by Zero0ne

  I have 2 servers, both with Windows 2003 R2 Each have 2 NIC ports that are 10/100/1000 They are both connected to our LAN + joined to the domain (1 NIC port free on each server) The problem is that our main router is only 10/100 on the ports that these servers are connected to. Since one server is going to host SQL 2005 and the other will be running Altiris NS7, I was hoping that I could use a crossover cable to connect the two directly, thus taking advantage of their 1gbps NIC cards. Is this possible? If so what steps do I need to take to accomplish this? What needs to be done to make sure that when the app server is communicating with the SQL server that it is using the direct link vs traversing the LAN? Thanks a lot!

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• Monitoring bandwidth/latency/jitter between 2 sites?

  - by TheCleaner

  I have 2 sites connected via an MPLS network and I'd like to do the following: setup a host on each end that can "talk" back and forth between each other and somehow report/log what kind of throughput, jitter, latency, etc. they are experiencing between each other in 5 minute intervals. Something similar to Qcheck but that can be automated. Bottom line is I'm trying to determine if the WAN network is "stable" throughout the day or if something is wrong. We have video conferences between these sites and even at 1024kbps calls we are experiencing delays and jitter. I'm hoping to exonerate the network with some testing.

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• HP ProLiant DL320e G8 v2 - USB2.0 during POST

  - by user3513346

  Initially my USB2.0 ports were working during POST (and boot). However, now they appear not to be. I first noticed this when I could not access the RBSU by pressing F9 during POST. Then found that I couldn't boot from USB either (I was able to do both of these initially). When performing the boot via iLo remote console I can access all of the setups (i.e., all of the F(X)'s) and can boot virtual media from a 'removable drive'. Keyboard works fine once the OS is booted. Not really sure what to try here. Any advice would be greatly appreciated. Thanks. Nick.

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• connect two computers together via a rs232 serial port

  - by Richard

  Wondering if anyone knows of a solution to connect with telnet/ssh through a rs232 serial port Edit: I am looking for a way to connect to computers together via a serial port. I want to be able to view the file system of a computer through a serial port.. Is this possible? Edit: So I have successfully connected two computers together using r232 serial ports with a null modem. The instructions I have used are located here Now how do I get to the file system of the host computer?? Any ideas?

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• Purpose of LAN Domain?

  - by Leonard Thieu

  What is the purpose of creating a domain name for your LAN? I'm using DD-WRT on my router and assigned local.moofz.com as the LAN domain. I setup Apache HTTP servers on two of the computers on my LAN to test it out. I could reach them on oneil.local.moofz.com and vala.local.moofz.com, but I found out that I could also reach them via their hostnames oneil and vala. If I can reach them through their host names, then what would be the purpose of having a domain name for my LAN?

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• Does anyone know about nagios plugin that uses nmap and does port checking??

  - by Eedoh

  Hi to all. I need to monitor open and closed ports on dozens of hosts. I've found a Nagios plugin that does what I need, but I would have to use this script through nrpe. Some of the hosts are powered by linux and they all have perl installed. But some of them are Windows machines, and it's not convenient for me to install perl on every one of them. That's why I can not use this plugin. I hope that there's Nagios plugin that uses nmap, or something similar, so it could check ports on every host remotely, without installing plugins on remote hosts, only on server.

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