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• Memory usages in Linux drops frequently

  - by FunkyChicken

  I run a CentOS 5.6 (64bit) machine that has Nginx (latest version) running, with php-fpm (latest version). Things run very well, but since about 2 weeks I noticed in my Munin graphs that about every 2 hours the 'cache' usages drops. Before it used be a steady fully graph, that didn't seem to reset every so often. PHP-FPM settings: pm.max_children = 300 daemonize = yes pm = static listen = /tmp/fpm.sock pm.max_requests = 1000 I have checked the php-fpm.log, and about once per 5 seconds a child process is killed, and restarted. But this is all the time, so this does not explain the sudden drops. I only run Nginx, PHP (via fpm), Munin and vsftpd on this machine. No crons run at exactly the time of the drops. My question: What could be causing these drops in cache usage?

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• How to bridge multiple wireless access points (and internet entry points) into one network

  - by amccormack

  I have two DSL lines coming in to wireless access points and then running to a RV082 Gateway/Bridge. The gateway then runs to a switch, which runs to multiple PCs and a Printer (See picture below). Normally, I would set up the wireless access points behind the gateway, but they are also the modems for the dsl. I have found that I can not print to the network printer if I am connected to the wireless network, but only if I am connected to the wired network. How can I configure the Gateway and APs (Routers) so that the PCs and Printer are all on the same internal network? I have tried turning DHCP off or redirect on the APs and redirect them to the Gateway. However, neither of these worked. Furthermore, I tried pinging the Gateway from the AP but got no response.

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• Internet cafe software for linux

  - by pehrs

  I have gotten a request to roll out a total of 8 internet cafe's in a large network. Budget is non-existent as it will all be done for a non-profit. I was planing to use Ubuntu and live-cds to minimize the amount of management required, but I can't seem to find any suitable internet cafe system that is Ubuntu based. The requirements are pretty basic: It needs to keep track of logged in time and log out users when their time it up. No billing will be done, it will just be used to ensure people can share the computers fairly. It should be possible to force logout from a central system. Users will be unskilled, so it has to have a GUI. What (preferably free, considering the shoe-string budget) software would you suggest to manage this?

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• Apache to read from /home/user/public_html on CentOS 5.7

  - by C.S.Putra

  this is my first experience using CentOS 5.7 / Linux as my web server OS and I have just finished installing Apache. Then I created a new account using WHM. The account is now created and the domain name can be accessed. I have put the web files under /home/user/public_html/ but when I access the domain assigned for that user which I assigned when creating new account in WHM, it doesn't read the files. In /usr/local/apache/conf/httpd.conf : <VirtualHost 175.103.48.66:80> ServerName domain.com ServerAlias www.domain.com DocumentRoot /home/user/public_html ServerAdmin [email protected] User veevou # Needed for Cpanel::ApacheConf <IfModule mod_suphp.c> suPHP_UserGroup group1 group1 </IfModule> <IfModule !mod_disable_suexec.c> SuexecUserGroup group1 group1 </IfModule> CustomLog /usr/local/apache/domlogs/domain.com-bytes_log "%{%s}t %I .\n%{%s}t %O ." CustomLog /usr/local/apache/domlogs/domain.com combined ScriptAlias /cgi-bin/ /home/user/public_html/cgi-bin/ </VirtualHost> Instead of reading from /home/user/public_html/ apache will read the /var/ww/html/ folder. How to set the apache so that when user access www.domain.com, they will access the files under /home/user/public_html/ ? Please advice. Thanks

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• Route packets from one VPN to another

  - by Mike

  I have two OpenVPN servers (10.8.0.0 and 10.9.0.0) set up on my OpenSUSE server. Within one network, each computer is visible to any other one, but I'd like to make it so that computers are visible across networks. I'd like to route the packets like this: when a user (say 10.8.0.6) pings an address on the other VPN (10.9.0.6), the packets are routed to the 10.9.0.1 and then to the appropriate computer in this VPN. How do I achieve this using iptables or a different tool? I tried the commands at the end of this section with no avail.

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• Total newb having SSH tunnel and remote MySQL access problems

  - by kscott

  I don't often work with linux or need to SSH tunnel into remote MySQL databases, so pardon my ignorance. I'm using Windows 7 and am needing to connect to a remote MySQL instance on a Linux server. For months I had been using the HeidiSQL client application successfully. Today two things happened: the DB moved to a new server and I updated HeidiSQL, now I cannot log in to the MySQL server, when attempting I get this message from Heidi: SQL Error (2003) in statement #0: Can't connect to MySQL server on 'localhost' (10061) If I use Putty, I can connect to the server and get MySQL access through command line, including fetching data from the DB. I assume this means my credentials and address are correct, but do not understand why putting those same details into HeidiSQL's SSH tunnel info won't work. I also downloaded the MySQL Workbench and attempted to set up a connection through that client and got this message: Cannot Connect to Database Server Your connection attempt failed for user 'myusername' from your host to server at localhost:3306: Lost connection to MySQL server at 'reading initial communication packet', system error: 0 Please: 1 Check that mysql is running on server localhost 2 Check that mysql is running on port 3306 (note: 3306 is the default, but this can be changed) 3 Check the myusername has rights to connect to localhost from your address (mysql rights define what clients can connect to the server and from which machines) 4 Make sure you are both providing a password if needed and using the correct password for localhost connecting from the host address you're connecting from From Googling around I see that it could be related to the MySQL bind-address, but I am a third party sub-contractor with no access to the MySQL settings of this box and the system admin is assuring me that I'm an idiot and need to figure it out on my end. This is completely possible but I don't know what else to try. Edit 1 - The client settings I am using In Heidi and MySQL Workbench I am using the following: SSH host + port: theHostnameOfTheRemoteServer.com:22 {this is the same host I can Putty to} SSH Username: mySSHusername {the same user name I use for my Putty connection} SSH Password: mySSHpassword {the same password for the Putty connection} Local port: 3307 {this is on the SSH settings tab and was defaulted to 3307 by Heidi, changing it to 3306 gives me a different error: SQL Error (1045) in statement #0: Access denied for user 'mySQLusername'@'localhost' (using password: YES)"} MySQL host: theHostnameOfTheRemoteServer.com {consensus seems to be I should use 'localhost' here} MySQL User: mySQLusername {which I can connect with once in with Putty} MySQL Password: mySQLpassword {which works once in with Putty} Port: 3306

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• Nginx Retry of Requests ( Nginx - Haproxy Combination )

  - by vaibhav

  I wanted to ask about Nginx Retry of Requests. I have a Nginx running at the backend which then sends the requests to HaProxy which then passes it on the web server and the request is processed. I am reloading my Haproxy config dynamically to provide elasticity. The problem is that the requests are dropped when I reload Haproxy. So I wanted to have a solution where I can just retry that from Nginx. I looked through the proxy_connect_timeout, proxy_next_upstream in http module and max_fails and fail_timeout in server module. I initially only had 1 server in the upstream connections so I just that up twice now and less requests are getting dropped ( only when ) have say the same server twice in upstream , if I have same server 3-4 times drops increase ). So , firstly I wanted to now , that when a request is not able to establish connection from Nginx to Haproxy so while reloading it seems that conneciton is seen as error and straightway the request is dropped . So how can I either specify the time after the failure I want to retry the request from Nginx to upstream or the time before which Nginx treats it as failed request. ( I have tried increaing proxy_connect_timeout - didn't help , mail_retires , fail_timeout and also putting the same upstream server twice ( that gave the best results so far ) Nginx Conf File upstream gae_sleep { server 128.111.55.219:10000; } server { listen 8080; server_name 128.111.55.219; root /var/apps/sleep/app; # Uncomment these lines to enable logging, and comment out the following two #access_log /var/log/nginx/sleep.access.log upstream; error_log /var/log/nginx/sleep.error.log; access_log off; #error_log /dev/null crit; rewrite_log off; error_page 404 = /404.html; set $cache_dir /var/apps/sleep/cache; location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://gae_sleep; client_max_body_size 2G; proxy_connect_timeout 30; client_body_timeout 30; proxy_read_timeout 30; } location /404.html { root /var/apps/sleep; } location /reserved-channel-appscale-path { proxy_buffering off; tcp_nodelay on; keepalive_timeout 55; proxy_pass http://128.111.55.219:5280/http-bind; } }

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• Why does RoboCopy create a hidden system folder?

  - by Svish

  I thought I would try out RoboCopy for mirroring the contents of a folder to another harddrive. And seems like it worked. But, for some reason, to see the destination folder I have to both enable Show hidden files, folders and drives and disable Hide protected operating system files. Why is this? Both the source and destination folder was initially both visible and normal directories. When I open up the properties for that destination folder, the Hidden attribute is even disabled. What is going on here? Is it because I ran it in an administrator command prompt? Or is it an issue with my choice of modifiers? Or does robocopy really just work this way? robocopy E: I:\E /COPYALL /E /R:0 /MIR /B /ETA Update: Tried to copy another drive to another folder, and I got the same thing happening there. But when I try to just copy a folder to a different folder, then the destination folder stays normal. Could it be because I copy a drive? If so, how can I prevent this from happening? Cause I really do want to copy the whole drive...

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• cygwin sshd times out for remote login

  - by reve_etrange

  I have configured SSHD using Cygwin on Windows 7. I have checked and double-checked all of the following points: Port forwarding is correctly configured Windows Firewall is configured to pass port 22 Local login attempts (using Cygwin SSH) succeed sshd_config has UseDNS No Using nmap from remote machine confirms port 22 is accessible /etc/passwd and /etc/group are correctly populated However, remote login attempts time out. This includes from the local network. user@host:~$ ssh -vvv [email protected] OpenSSH_5.5p1 Debian-4ubuntu6, OpenSSL 0.9.8o 01 Jun 2010 debug1: Reading configuration data /home/user/.ssh/config debug1: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to the.ip.add.ress [the.ip.add.ress] port 22. debug1: connect to address the.ip.add.ress port 22: Connection timed out ssh: connect to the.ip.add.ress port 22: Connection timed out No messages are logged to /var/log/sshd.log. I suspect that there is a permissions issue with a particular file somewhere, however I have checked the permissions of all my Cygwin binaries, DLLs and the particular files important to Cygwin sshd, including all of: /etc/passwd /etc/group /var /var/log/sshd.log /var/empty Others who have reported this or similar errors appear to have missed one of the points enumerated above. Can anyone point me to a possible solution?

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• Mysqldump causes "Too many connections"

  - by vbachev

  A scheduled backup using mysqldump on one of our databases is causing Too many connections. The database is of both InnoDB and MyISAM tables with size of around 500Mb. The Too many connections appears for about 2-3 minutes We understand that mysqldump locks the tables and causes all other queries and connections to pile up and jam the mysql server. We need frequent backups and we cannot afford server downtime or putting websites in maintenance mode while doing it. Our websites are global and traffic is high all the time so its hard to find a moment for backups. How can we avoid downtime during backups?Is there maybe a way to use mysqldump in way that it will not lock all tables at the same time?Is there an alternative to backing up with mysqldump?

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• Amazon AWS Ec2 instance, Elastic IP, Domain name from external domainseller, and Google Apps for Email

  - by Sid

  We are hosting our site on an Ec2 instance. Our Elastic IP is w.x.y.z and Public DNS is: ec2-w-x-y-z.compute-1.amazonaws.com. We've bought a domain name domainname.com from a lesser known domain-name-seller. We added an A-record pointing domainname.com to w.x.y.z. Will this work or do we need a CNAME record to point to the same too? We wanted to use Google apps for emailing so adjusted the TXT/MX records according to the Google Apps instructions to be able to send/recv email using @domainname.com email addresses. Have we got it right, more important, we came across queries relating to email sent from ec2-w-x-y-z.compute-1.amazonaws.com (our users can send email from their onsite accounts) going to spam (rDNS not pointing to domainname.com but to ec2-w-x-y-z.compute-1.amazonaws.com). How can we fix this? We came across SPF records, do they provide a complete solution? We aren't sure as to how to use them. Can you help pls? Thank you, Sid

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• Best VPS based in UK?

  - by jimbo

  I am on the hunt for a new VPS supplier based in the UK, I was loving the look and service provided by Media Temple, and was going to go down that route but would prefer something held in the UK. Any suggestions more than welcome...

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• Why is GPO Tool reporting a GPO version mismatch when the GPO version #'s do match?

  - by SturdyErde

  Any ideas why the group policy diagnostic utility GPOTool would report a GPO version mismatch between two domain controllers if the version numbers are a match? Policy {GUID} Error: Version mismatch on dc1.domain.org, DS=65580, sysvol=65576 Friendly name: Default Domain Controllers Policy Error: Version mismatch on dc2.domain.org, DS=65580, sysvol=65576 Details: ------------------------------------------------------------ DC: dc1.domain.org Friendly name: Default Domain Controllers Policy Created: 7/7/2005 6:39:33 PM Changed: 6/18/2012 12:33:04 PM DS version: 1(user) 44(machine) Sysvol version: 1(user) 40(machine) Flags: 0 (user side enabled; machine side enabled) User extensions: not found Machine extensions: [{GUID}] Functionality version: 2 ------------------------------------------------------------ DC: dc2.domain.org Friendly name: Default Domain Controllers Policy Created: 7/7/2005 6:39:33 PM Changed: 6/18/2012 12:33:05 PM DS version: 1(user) 44(machine) Sysvol version: 1(user) 40(machine) Flags: 0 (user side enabled; machine side enabled) User extensions: not found Machine extensions: [{GUID}] Functionality version: 2

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• Where to start? Server profiling tools

  - by Dave Chenell

  So I have a website, users upload images, people view images etc. Simple enough. Lots of writes and reads everywhere. Its built in MySQL and PHP on Apache. We have one dedicated server. Right now we are getting hammered with unexpected press and users and our CPU cycle is out of control, slowing down the entire site. Off hand I am guessing its either the saving of the image to the disk, or the Mysql queries. What tools can I use to educate myself on what is happening and pinpoint the problem? How can I find out what is happening in detail in this time of crisis?

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• mounting VMDK images on opensolaris

  - by Bjorn Harpe

  I know that VMware ships a vmware-mount utility with its server 2 packages on Linux that allow you to mount a VMDK outside a vm and treat it as a normal filesystem mounted on the given mountpoint. Is there a method for accomplishing something similar in OpenSolaris that does not require converting to a raw image and then back?

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• Browser sends http request with RANGE

  - by nute

  I have a local testing environment in a Fedora virtual machine. Strangely, resources (css and js files) don't seem to work. Looking at Firebug, I see that the browser sends the HTTP request with "Range bytes=0-". The server responds with either an empty 200OK or an empty 206 Partial Content. Here is an example: Response Headers Date Mon, 23 Nov 2009 23:33:26 GMT Server Apache/2.2.13 (Fedora) Last-Modified Thu, 19 Nov 2009 22:58:55 GMT Etag "18-3aec-478c14dbee138" Accept-Ranges bytes Content-Length 15084 Content-Range bytes 0-15083/15084 Connection close Content-Type text/css Request Headers Host fedora.test User-Agent Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091105 Fedora/3.5.5-1.fc11 Firefox/3.5.5 Accept text/css,*/*;q=0.1 Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 300 Connection keep-alive Referer http://fedora.test/pictures/ Cookie __utma=26341546.1613992749.1258504422.1258569125.1258752550.4; __utmz=26341546.1258504422.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); PHPSESSID=tqf8jfmc77qihe97rl4tmhq685 Range bytes=0- If-Range "18-3aec-478c14dbee138" I don't know if the browser is sending the wrong request, or if it's the server that is doing this. Request made to the outside (such as google analytics) are working fine. This is running in Fedora 11 in VirtualBox. Apache. PHP. The files are being served through the "shared folders" feature of VirtualBox (could it be related?). No error logs could help me.

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• Data Execution Prevention problem in Windows Server 2008

  - by naveen

  Hi guys, I am an ASP.NET developer, who has minimal knowledge in Server administration. I have a database hosted at Windows Server 2008. Today morning onwards it periodically stops working. The message given is something to the effect "The program is being shut down to prevent Data Execution Prevention error" Some other programs are also showing the behavior. I would like to know, what causes this all of a sudden? The server is UN-protected(IE: no anti-virus installed at all), could this be a possible anti-virus/ malware attack? What do we need to do to get the SOL running smoothly again? Regards, Naveen Jose

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• Setting up a GIt server

  - by lindenb

  Hi all, My team is working with several RedHat linux servers and we'd like to synchronize our sources from one server to another (for several distinct projects). I'd like to set-up a git-server as a version control; however I'm new to git and I'm confused by the terms ('server', "daemon', 'repository', etc...). Moreover we're working behind a firewall. Can anyone point me to a link about how to setup a git server ? Thanks. Pierre

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• Win Server 2008 force kerberos setting

  - by ftiaronsem

  I am currently facing the problem that a linux machine running Ubuntu 10.04 LTS with samba and winbindd installed is unable to join a Domain, that is managed by a Windows 2008 DC. The linux config, is probably alright, since I have successfully used it at multiple sites, running 2008 as well as 2003 DCs. The error I get ("libads/kerberos.c: Join to domain is not valid. Client credentials have been revoked"), indicates that there is a kerberos problem. Normally the linux box is supposed to authenticate via NTLM and is configured that way. The only reason I can image why it tries kerberos is that the DC is forcing it. Do you know whether there is any setting in the security policies of a window 2008 server, that would completely block NTLM, forcing kerberos? If so, where can I find this setting?

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• Kerberos authentication not working for one single domain

  - by Buddy Casino

  We have a strange problem regarding Kerberos authentication with Apache mod_auth_kerb. We use a very simple krb5.conf, where only a single (main) AD server is configured. There are many domains in the forest, and it seems that SSO is working for most of them, except one. I don't know what is special about that domain, the error message that I see in the Apache logs is "Server not found in Kerberos database": [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(1025): [client xx.xxx.xxx.xxx] Using HTTP/[email protected] as server principal for password verification [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(714): [client xx.xxx.xxx.xxx] Trying to get TGT for user [email protected] [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(625): [client xx.xxx.xxx.xxx] Trying to verify authenticity of KDC using principal HTTP/[email protected] [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(640): [client xx.xxx.xxx.xxx] krb5_get_credentials() failed when verifying KDC [Wed Aug 31 14:56:02 2011] [error] [client xx.xxx.xxx.xxx] failed to verify krb5 credentials: Server not found in Kerberos database [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(1110): [client xx.xxx.xxx.xxx] kerb_authenticate_user_krb5pwd ret=401 user=(NULL) authtype=(NULL) When I try to kinit that user on the machine on which Apache is running, it works. I also checked that DNS lookups work, including reverse lookup. Who can tell me whats going?

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• Syn_Recievd on port 80 , IIS 7.5

  - by Ashian

  Hi I have a trouble on my windows 2008 server. I host several web site on it. From some days ago, my web sites stop responding on port 80 after a while. In this time I can't access web sites from local machine and from remote. I can also browse websites on other ports ( custom port that I set) I find that I have many Syn_Received status on netstat. And when web sites stop, I got only syn_received on port 80. I have to restart server because when I try to restart IIS , it takes a long time to stop W3SVC and many times it doesn’t stop at all. Would anyone please tell me : - How can I manage Syn Attack ? Thanks

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• How to connect the virtual networks of vmware guests running on different hosts?

  - by gyrolf

  In a test setup, we are running several virtual machines on a single vmware workstation host. All virtual machines are connected via a "host only" network. This runs fine up to 2 or 3 virtual machines (depending on the host hardware). To allow more virtual machines, we want to use more host machines. Details about the environment and applications: Host PCs are running Windows XP in a corporate intranet. VMware used is Workstation 6.5 Guests are running Windows Server 2003 All guests act as Web Servers One of the guests additionally acts as Windows File server, offering shared folders for the other guests to connect to. Restrictions: VMware guests shall not be visible from the intranet. Changes to the host PC are restricted by corporate policy. In the virtual network, no domain controller exists. All virtual machines are member of the same workgroup. Running the virtual network as NAT is possible. Port forwarding might be used if it does not conflict with ports used by the host PC. Looking for a solution, I found hints about using router or vpn software on the hosts, but without any details how to setup. (I found a similar question Sharing the network between 2 VMware hosts, but the answer was not sufficient for me.)

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• How do I host multiple independent, secured SharePoint sites (WSS 3.0) without using Active Directory on the same server?

  - by Kyle Noland

  I have a SharePoint site set up on one of my networks to service Active Directory users. To be clear, this is a Windows SharePoint Services 3.0 installation running on Windows Server 2003 Standard. It is not an option to upgrade the server or SharePoint version. Management would like to create several new sites, one for each of a handful of clients. These sites will be used like "dropboxes" or FTP sites so that my company can make large files available to outside contacts, and vice versa. Here are my requirements: I do not want to have to create Active Directory accounts for each external contact. If possible, I would like to store the external usernames and passwords in a database that I can write a small GUI for so that management can handle adding their own external contacts. Each client site must be sandboxed from each other and from my main company SharePoint site. I would like to keep everything running on port 80 and be able to access the sites as either clientname.mycompany.com or www.mycompany.com/clientname If anybody has ever done this I would really appreciate hearing about any lessons you learned and suggestions for how to set this up. Kyle

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• Secondary DHCP server won't start on Centos 6.2

  - by Slowjoe

  I'm trying to create a backup DHCP server. Server times are in sync. Primary server starts fine. Secondary server won't start. Error from /var/log/messages is: Sep 15 14:47:45 stream dhcpd: Copyright 2004-2010 Internet Systems Consortium. Sep 15 14:47:45 stream dhcpd: All rights reserved. Sep 15 14:47:45 stream dhcpd: For info, please visit https://www.isc.org/software/dhcp/ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 25: invalid statement in peer declaration Sep 15 14:47:45 stream dhcpd: #011max-response-default Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 41: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 49: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: WARNING: Host declarations are global. They are not limited to the scope you declared them in. Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 70: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 78: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: Configuration file errors encountered -- exiting Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: This version of ISC DHCP is based on the release available Sep 15 14:47:45 stream dhcpd: on ftp.isc.org. Features have been added and other changes Sep 15 14:47:45 stream dhcpd: have been made to the base software release in order to make Sep 15 14:47:45 stream dhcpd: it work better with this distribution. Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: Please report for this software via the CentOS Bugs Database: Sep 15 14:47:45 stream dhcpd: http://bugs.centos.org/ Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: exiting. Config file contents: # DHCP Server Configuration file. # see /usr/share/doc/dhcp*/dhcpd.conf.sample # see 'man 5 dhcpd.conf' # option domain-name "eng.foo.com"; option domain-name-servers ns0.eng.foo.com, ns1.eng.foo.com; option ntp-servers ntp.eng.foo.com; #option time-servers ntp.eng.foo.com; default-lease-time 3600; max-lease-time 7200; authoritative; log-facility local7; failover peer "dhcp-failover" { secondary; address 10.0.1.70; port 647; peer address 10.0.1.11; peer port 647; max-response-default 30; max-unacked-updates 10; load balance max seconds 3; } # # Management subnet # subnet 10.0.0.0 netmask 255.255.255.0 { option subnet-mask 255.255.255.0; option broadcast-address 10.0.0.255; option routers 10.0.0.1; option domain-search "eng.foo.com", "foo.com"; # Unknown clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 300; range 10.0.0.240 10.0.0.249; allow unknown-clients; } # Known clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 28800; range 10.0.0.150 10.0.0.199; deny unknown-clients; } include "/etc/dhcp/dhcpd.conf-engmgmt"; } # # Data subnet # subnet 10.0.1.0 netmask 255.255.255.0 { option subnet-mask 255.255.255.0; option broadcast-address 10.0.1.255; option routers 10.0.1.1; option domain-search "eng.foo.com", "foo.com"; # Unknown clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 300; range 10.0.1.240 10.0.1.249; allow unknown-clients; } # Known clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 28800; range 10.0.1.150 10.0.1.199; deny unknown-clients; } # For centos network installs if substring (option vendor-class-identifier, 0, 8) = "anaconda" { filename "/autohome/distro/ks/"; next-server eng-data.eng.foo.com; } # For PXE network installs if substring (option vendor-class-identifier, 0, 9) = "PXEClient" { filename "pxelinux.0"; next-server eng-data.eng.foo.com; } # For KVM PXE network installs if substring (option vendor-class-identifier, 0, 9) = "Etherboot" { filename "pxelinux.0"; next-server eng-data.eng.foo.com; } include "/etc/dhcp/dhcpd.conf-engdata"; }

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• What characteristic of networking/TCP causes linear relation between TCP activity and latency?

  - by DeLongey

  The core of this problem is that our application uses websockets for real-time interfaces. We are testing our app in a new environment but strangely we're noticing an increasing delay in TCP websocket packets associated with an increase in websocket activity. For example, if one websocket event occurs without any other activity in a 1-minute period, the response from the server is instantaneous. However, if we slowly increase client activity the latency in server response increases with a linear relationship (each packet will take more time to reach the client with more activity). For those wondering this is NOT app-related since our logs show that our server is running and responding to requests in under 100ms as desired. The delay starts once the server processes the request and creates the TCP packet and sends it to the client (and not the other way around). Architecture This new environment runs with a Virtual IP address and uses keepalived on a load balancer to balance the traffic between instances. Two boxes sit behind the balancer and all traffic runs through it. Our host provider manages the balancer and we do not have control over that part of the architecture. Theory Could this somehow be related to something buffering the packets in the new environment? Thanks for your help.

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