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• XDEBUG/PHP doesn't dump profile even when set up properly?

  - by John D.

  I installed xdebug from source, but also tried my package manager (separately) and they both are loaded correctly (verified by restarting Apache and seeing the xdebug copyright info in phpinfo()) but they do not dump profiling information. Out of the 40 different attempts of configuration it logged once or twice but I lost what I did, I tried with first only loading the module in php.ini with no settings, but it didn't log to /tmp/. I tried many different settings but my current is now: xdebug.profiler_enable = Off xdebug.profiler_enable_trigger = 1 xdebug.profiler_output_dir = "/tmp/" xdebug.profiler_output_name = "profiler.%t" Of course I call my script through 127.0.0.1/test.php?XDEBUG_PROFILE, which is for enable_trigger. Do you know why it would not dump profiler information? nobody (Arch Linux) can write to /tmp/ as it has before, so I'm sure it is not a permissions error. Apache's error_log does not tell me anything about xdebug either, as it has loaded correctly. It just does not "work"! EDIT: I made a subfolder "xdebug_profiles" in /tmp/ and chown'ed it to nobody, and now it works flawlessly. I'm not sure why it couldn't write before, I guess it's just a caveat with nobody on Arch. I answered my own question , not enough points to answer it or comment, so consider this answered.

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• Changed Password Won't seem to work for account

  - by erik

  Bit of an odd problem. I've got a server I can SSH into as one of two logins: root or erik. Once I've logged in as erik I've tried to switch to the root user: # sudo su - root Password: And entered the password. After several failures I thought I might have forgotten. So I SSH'd in as root, and changed the root password: # passwd Now back to the other shell (erik) and attempt to run sudo su - root and again, it won't accept the just changed password. Any ideas?

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• Tomcat cookies not working via my ProxyPass VirtualHost

  - by John

  Hi there. I'm having some issues with getting cookies to work when using a ProxyPass to redirect traffic on port 80 to a web-application hosted via Tomcat. My motivation for enabling cookies is to get rid of the "jsessionid=" parameter that is appended to the URLs. I've enabled cookies in my context.xml in META-INF/ for my web application. When I access the webapplication via http://url:8080/webapp it works as expected, the jsessionid parameter is not visible in the URL, instead it's stored in a cookie. When accessing my website via an apache2 virtualhost the cookies doesn't seem to work because now "jsessionid" is being appended to the URLs. How can I solve this issue? Here's my VHost configuration: <VirtualHost *:80 ServerName somedomain.no ServerAlias www.somedomain.no <Proxy * Order deny,allow Allow from all </Proxy ProxyPreserveHost Off ProxyPass / http://localhost:8080/webapp/ ProxyPassReverse / http://localhost:8080/webapp/ ErrorLog /var/log/apache2/somedomain.no.error.log CustomLog /var/log/apache2/somedomain.no.access.log combined </VirtualHost

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• How to drop packets in a custom Intrusion Detection System

  - by tzoukos

  Hi there, I'm trying to build a custom Intrusion Detection and Prevention System (IDS/IPS). I found a great utility named ROPE which can scan the packet payload and drop the packet that doesn't follow the rules, set by a script. This serves my purpose completely, since what I want to do is check the payload for some specific text and then drop it or allow it ( the string feature in iptables wouldn't do me any good, because I want to check more than one string in tha payload, like usernames, id's, etc ). However, ROPE is really old and despite my many attempts I haven't managed to install it properly. Do you know any similar program that will help me drop packets in iptables depending on the payload? Any suggestion is greatly appreciated :)

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• JNDI Datasource Problem on Tomcat 6, Hibernate

  - by Asuman AKYILDIZ

  I am using Tomcat 6 as application server, Struts-Hibernate and MyEclipse 6.0. My application uses JDBC driver but I should modify it to use JNDI Datasource. I followed steps as described in tomcat 6.0 howto tutorial. I defined my resource in tomcatconf: <Resource name="jdbc/ats" global="jdbc/ats" auth="Container" type="javax.sql.DataSource" driverClassName="oracle.jdbc.OracleDriver" url="jdbc:oracle:thin:@//localhost:1521/MISDEV" username="TEST" password="TEST" maxActive="20" maxIdle="10" maxWait="-1" validationQuery="SELECT 1 from dual" removeAbandoned="true" removeAbandonedTimeout="30" logAbandoned="false"/> I gave reference in my application web.xml: <resource-ref> <description>Oracle Datasource example</description> <res-ref-name>jdbc/ats</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> And I defined datasource-dialect in my hibernate-cfg.xml <property name="connection.datasource">java:comp/env/jdbc/ats</property> <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property> But when I create hibernate session, it can not open the connection: 09:18:11,322 ERROR JDBCExceptionReporter:72 - Connections could not be acquired from the underlying database! org.hibernate.exception.GenericJDBCException: Cannot open connection I also tried to set the properties at runtime: Configuration configuration = new Configuration(); configuration.setProperty("hibernate.dialect", "org.hibernate.dialect.Oracle9Dialect"); //configuration.setProperty("hibernate.connection.datasource", "java:comp/env/jdbc/ats"); configuration.setProperty("hibernate.current_session_context_class", "thread"); configuration.setProperty("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider"); configuration.setProperty("hibernate.show_sql", "true"); sessionFactory = configuration.configure().buildSessionFactory(); It does not open connection again. But, when I use JDBC driver it works: Configuration configuration = new Configuration(); configuration.setProperty("hibernate.dialect", "org.hibernate.dialect.Oracle9Dialect"); //configuration.setProperty("hibernate.connection.datasource", "java:comp/env/jdbc/ats"); configuration.setProperty("hibernate.connection.url", "jdbc:oracle:thin:@//localhost:1521/MISDEV"); configuration.setProperty("hibernate.connection.username", "test"); configuration.setProperty("hibernate.connection.password", "test"); configuration.setProperty("hibernate.connection.driver_class", "oracle.jdbc.OracleDriver"); configuration.setProperty("hibernate.transaction.factory_class", "org.hibernate.transaction.JDBCTransactionFactory"); configuration.setProperty("hibernate.current_session_context_class", "thread"); configuration.setProperty("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider"); configuration.setProperty("hibernate.show_sql", "true"); sessionFactory = configuration.configure().buildSessionFactory(); I have been searching for 3 days and no success. What may be de problem?

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• old ssl certficate didn't go away on apache2

  - by user1212143

  I have replaced the old ssl certficate with new one and restart apache several time but the old certificate still show on web browser and when I run a command openssl s_client -connect 127.0.0.1:443 -showcerts also I have delete all old certficate files. so not sure where apache still read these certficate. and not read the new one. here is my ssl.conf Listen 0.0.0.0:443 SSLEngine on SSLOptions +StrictRequire <Directory /> SSLRequireSSL </Directory> SSLProtocol -all +TLSv1 +SSLv3 SSLCipherSuite HIGH:MEDIUM:!aNULL:+SHA1:+MD5:+HIGH:+MEDIUM SSLMutex file:/usr/apache2/logs/ssl_mutex SSLRandomSeed startup file:/dev/urandom 1024 SSLRandomSeed connect file:/dev/urandom 1024 SSLSessionCache shm:/usr/apache2/logs/ssl_cache_shm SSLSessionCacheTimeout 600 SSLPassPhraseDialog builtin SSLCertificateFile /usr/apache2/conf/ssl.crt/server.crt SSLCertificateKeyFile /usr/apache2/conf/ssl.key/server.key SSLVerifyClient none SSLProxyEngine off <IfModule mime.c> AddType application/x-x509-ca-cert .crt AddType application/x-pkcs7-crl .crl </IfModule>

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• Applying memory limits to screen sessions

  - by CollinJSimpson

  You can set memory usage limits for standard Linux applications in: /etc/security/limits.conf Unfortunately, I previously thought these limits only apply to user applications and not system services. This means that users can by bypass their limits by launching applications through a system service such as screen. I'd like to know if it's possible to let users use screen but still enforce application limits. Jeff had the great idea of using nohup which obeys user limits (wonderful!), but I would still like to know if it's possible to mimic the useful windowing features of screen. EDIT: It seems my screen sessions are now obeying my hard address space limits defined in /etc/security/limits.conf. I must have been making some mistake. I recently installed cpulimit, but I doubt that's the solution.Thanks for the nohup tip, Jeff! It's very useful. Link to CPU Limit package

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• How Can I Automate the Backup of a Quickbooks Server?

  - by Nick

  I have three computers: The first is the company file server which has the Quick Books company file, is always on, and lives in the closet. The other two are Quick Books Clients. All are XP Pro. I need a way to automatically backup the QB data file, without any user intervention. Quick Books has a built in scheduled backup utility, but from what I've read, it only works when the software is running in single user mode. (and obviously putting the server into single user mode defeats the concept of having a server). Also, I'm not actually running QB itself on the server, just the "QB Database Server" process that sits in the system tray. Surely there must be a way to automate this? I'm open to any ideas/suggestions. Thanks!

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• Configuring and managing Windows web server

  - by Mike C.

  Hello, I run a few websites and I was thinking of paying for a dedicated Windows web server from GoDaddy instead of paying for each site's hosting individually. I know enough about IIS to configure the Host Header and stuff like that, but I'm a little fuzzy about the email portion of the hosting. I have a few questions: Do I need to install an SMTP server on the web server to allow for emails to be sent/received to a website email address? Or is there another approach that I'm unaware of? Are there tools that monitor the amount of bandwidth used by the server? GoDaddy charges for bandwidth and I want to make sure I don't go over. Am I opening a can of worms that I don't really want to open by going the dedicated server route? Things like server updates, security, etc? Thanks!

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• How do I Setup Multiple Sites in HostGator Shared Hosting?

  - by cillosis

  I recently decided to consolidate all of my random projects into a single hosting account as it was starting to get very expensive to run each on an individual hosting plan. I purchased the HostGator Baby plan which allows hosting of multiple domains. You have to set it up with a root domain name which is fine (I used my portfolio domain name). As far as file structure, I wanted a folder for each site in /public_html so the structure looks like this: - public_html/ - myportfolio.com/ - ... my files ... - anothersite.com/ - ... my files ... - thirdsite.com/ - ... my files ... I setup add-on domains and pointed them to their respective folders which works fine. My problem is the root domain ex. myportfolio.com expects it's files to be contained at the root of /public_html rather than within it's folder I created. I setup a redirect to point requests for myportfolio.com to myportfolio.com/myportfolio.com/ which works initially except (at least in my WordPress installation) it still references it's root folder as public_html. TL;DR; What is the best way to go about setting up multiple site hosting in a shared hosting environment (i.e. I can't setup vhosts). Does anybody know of any tutorials or videos that walk through this more clearly? Thanks.

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• Netscaler - Involving Response Body Replacement with GeoIP Implementation

  - by MrGoodbyte

  I have a Netscaler (10000) NS9.3: Build 52.3.cl There is a document contains a short tutorial about GeoIP database implementation at http://support.citrix.com/article/CTX130701 I have added location database by following this tutorial successfully but instead of dropping connections I need to replace a string in content body. To do that, I created a rewrite action with those parameters. * Name: ns_country_replacement_action * Type: REPLACE_ALL * Target Expression: HTTP.RES.BODY(50000) * Replacement Text: HTTP.RES.HEADER("international") * Pattern: \{\/\*COUNTRY_NAME\*\/\} To insert header called "international", I try to create another rewrite action with those parameters. I'll add this one's policy prior. * Name: ns_country_injection_action * Type: INSERT_HTTP_HEADER * Header Name: international * Header Value: CLIENT.IP.SRC.MATCHES_LOCATION("*.US.*.*.*.*").NOT When I click on create button, it says; Compound expression syntax error, [.*.*").NOT^, 50] I'm not sure but I think that two things might cause this error. The expression I use for MATCHES_LOCATION is wrong but I use same expression in the tutorial. MATCHES_LOCATION().NOT returns BOOLEAN but the field expects STRING. How can I get this work? Do I use right tools to accomplish what I need to do? Thank you. -Umut

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• Cant route VLAN over VPN between Cisco ASA 5505 and Cisco 870

  - by user60984

  We've had an existing VPN between a 5505 and 870 for some time. We've just added VLANs to the network on the 5505 side. We can't seem to figure out how to get devices on the VLANs to communicate with devices on the 870 network which have no VLANs. We're thinking we might have to use a router of sorts to handle the routing before hitting the ASA. We thought PFsense might work well. We've been banging our heads against this thing for 2 days so any immediate help would be great. We're up against a deadline. Thanks!!!

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• Server and Network Lag

  - by DanSpd

  At my home I have a server and my computer. Server has Windows Server 2008 Standart 64 bit installed and then my computer has Windows 7 64 bit installed. My home router is DIR-615 My server has a game server installed on it and basically total open connections on server are around 700. Once its around 700 server and then whole home network lags really badly. My internet connection is good and only around 600kb/s is being used out of 2mb/s (real download/upload speeds). So far I assume that my router has a connection limit and with server + my computer connections it peaks at around 1k and lags everything. Another assumption server lag comes from connection limit. On the internet I have read that standart version of server has connection limit of 700 + 10 reserved. I do not rmember where I found that information but it was on microsoft website. So I have two options. First is to upgrade my router to Netgear FVS318G-100 and second is to change connections limit on server. Any advices? Thank you

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• Server and Network Lag

  - by DanSpd

  At my home I have a server and my computer. Server has Windows Server 2008 Standart 64 bit installed and then my computer has Windows 7 64 bit installed. My home router is DIR-615 My server has a game server installed on it and basically total open connections on server are around 700. Once its around 700 server and then whole home network lags really badly. My internet connection is good and only around 600kb/s is being used out of 2mb/s (real download/upload speeds). So far I assume that my router has a connection limit and with server + my computer connections it peaks at around 1k and lags everything. Another assumption server lag comes from connection limit. On the internet I have read that standart version of server has connection limit of 700 + 10 reserved. I do not rmember where I found that information but it was on microsoft website. So I have two options. First is to upgrade my router to Netgear FVS318G-100 and second is to change connections limit on server. Any advices? Thank you

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• Redirect audio from multiple Terminal Services sessions

  - by DougN

  When logged into a Remote Desktop session, you can request the audio be brought to the local computer (redirected audio). You hear the audio generated by your session. Is there anyway to have the audio generated by other sessions also redirected and forwarded to the local computer?

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• Disabling CPU management

  - by Tiffany Walker

  If I add the following processor.max_cstate=0 to the kernel command line for boot up, does that disable all CPU power management and throttling? I also found: http://www.experts-exchange.com/OS/Linux/Administration/A_3492-Avoiding-CPU-speed-scaling-in-modern-Linux-distributions-Running-CPU-at-full-speed-Tips.html The link talks of Change CPU governor from 'ondemand' to 'performance' for all CPUs/cores and disabling kondemand from kernel. Server is for web hosting UPDATES: 2.6.32-379.1.1.lve1.1.7.6.el6.x86_64 #1 SMP Sat Aug 4 09:56:37 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux . # dmidecode 2.11 SMBIOS 2.6 present. 74 structures occupying 2878 bytes. Table at 0x0009F000. Handle 0x0000, DMI type 0, 24 bytes BIOS Information Vendor: American Megatrends Inc. Version: 1.0c Release Date: 05/27/2010 Address: 0xF0000 Runtime Size: 64 kB ROM Size: 4096 kB Characteristics: ISA is supported PCI is supported PNP is supported BIOS is upgradeable BIOS shadowing is allowed ESCD support is available Boot from CD is supported Selectable boot is supported BIOS ROM is socketed EDD is supported 5.25"/1.2 MB floppy services are supported (int 13h) 3.5"/720 kB floppy services are supported (int 13h) 3.5"/2.88 MB floppy services are supported (int 13h) Print screen service is supported (int 5h) 8042 keyboard services are supported (int 9h) Serial services are supported (int 14h) Printer services are supported (int 17h) CGA/mono video services are supported (int 10h) ACPI is supported USB legacy is supported LS-120 boot is supported ATAPI Zip drive boot is supported BIOS boot specification is supported Targeted content distribution is supported BIOS Revision: 8.16 Handle 0x0001, DMI type 1, 27 bytes System Information Manufacturer: Supermicro Product Name: X8SIE Version: 0123456789 Serial Number: 0123456789 UUID: 49434D53-0200-9033-2500-33902500D52C Wake-up Type: Power Switch SKU Number: To Be Filled By O.E.M. Family: To Be Filled By O.E.M. Handle 0x0002, DMI type 2, 15 bytes Base Board Information Manufacturer: Supermicro Product Name: X8SIE Version: 0123456789 Serial Number: VM11S61561 Asset Tag: To Be Filled By O.E.M. Features: Board is a hosting board Board is replaceable Location In Chassis: To Be Filled By O.E.M. Chassis Handle: 0x0003 Type: Motherboard Contained Object Handles: 0 Handle 0x0003, DMI type 3, 21 bytes Chassis Information Manufacturer: Supermicro Type: Sealed-case PC Lock: Not Present Version: 0123456789 Serial Number: 0123456789 Asset Tag: To Be Filled By O.E.M. Boot-up State: Safe Power Supply State: Safe Thermal State: Safe Security Status: None OEM Information: 0x00000000 Height: Unspecified Number Of Power Cords: 1 Contained Elements: 0

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• Node.js, Nginx and Varnish with WebSockets

  - by Joe S

  I'm in the process of architecting the backend of a new Node.js web app that i'd like to be pretty scalable, but not overkill. In all of my previous Node.js deployments, I have used Nginx to serve static assets such as JS/CSS and reverse proxy to Node (As i've heard Nginx does a much better job of this / express is not really production ready). However, Nginx does not support WebSockets. I am making extensive use of Socket.IO for the first time and discovered many articles detailing this limitation. Most of them suggest using Varnish to direct the WebSockets traffic directly to node, bypassing Nginx. This is my current setup: Varnish : Port 80 - Routing HTTP requests to Nginx and WebSockets directly to node Nginx : Port 8080 - Serving Static Assets like CSS/JS Node.js Express: Port 3000 - Serving the App, over HTTP + WebSockets However, there is now the added complexity that Varnish doesn't support HTTPS, which requires Stunnel or some other solution, it's also not load balanced yet (Perhaps i will use HAProxy or something). The complexity is stacking up! I would like to keep things simpler than this if possible. Is it still necessary to reverse proxy Node.js using Nginx when Varnish is also present? As even if express is slow at serving static files, they should theoretically be cached by Varnish. Or are there better ways to implement this?

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• CentOS vs. Ubuntu

  - by DLH

  I had a web server that ran Ubuntu, but the hard drive failed recently and everything was erased. I decided to try CentOS on the machine instead of Ubuntu, since it's based on Red Hat. That association meant a lot to me because Red Hat is a commercial server product and is officially supported by my server's manufacturer. However, after a few days I'm starting to miss Ubuntu. I have trouble finding some of the packages I want in the CentOS repositories, and the third-party packages I've tried have been a hassle to deal with. My question is, what are the advantages of using CentOS as a server over Ubuntu? CentOS is ostensibly designed for this purpose, but so far I would prefer to use a desktop edition of Ubuntu over CentOS. Are there any killer features of CentOS which make it a better server OS? Is there any reason I shouldn't switch back to Ubuntu Server or Xubuntu?

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• Why do we get a sudden spike in response times?

  - by Christian Hagelid

  We have an API that is implemented using ServiceStack which is hosted in IIS. While performing load testing of the API we discovered that the response times are good but that they deteriorate rapidly as soon as we hit about 3,500 concurrent users per server. We have two servers and when hitting them with 7,000 users the average response times sit below 500ms for all endpoints. The boxes are behind a load balancer so we get 3,500 concurrents per server. However as soon as we increase the number of total concurrent users we see a significant increase in response times. Increasing the concurrent users to 5,000 per server gives us an average response time per endpoint of around 7 seconds. The memory and CPU on the servers are quite low, both while the response times are good and when after they deteriorate. At peak with 10,000 concurrent users the CPU averages just below 50% and the RAM sits around 3-4 GB out of 16. This leaves us thinking that we are hitting some kind of limit somewhere. The below screenshot shows some key counters in perfmon during a load test with a total of 10,000 concurrent users. The highlighted counter is requests/second. To the right of the screenshot you can see the requests per second graph becoming really erratic. This is the main indicator for slow response times. As soon as we see this pattern we notice slow response times in the load test. How do we go about troubleshooting this performance issue? We are trying to identify if this is a coding issue or a configuration issue. Are there any settings in web.config or IIS that could explain this behaviour? The application pool is running .NET v4.0 and the IIS version is 7.5. The only change we have made from the default settings is to update the application pool Queue Length value from 1,000 to 5,000. We have also added the following config settings to the Aspnet.config file: <system.web> <applicationPool maxConcurrentRequestsPerCPU="5000" maxConcurrentThreadsPerCPU="0" requestQueueLimit="5000" /> </system.web> More details: The purpose of the API is to combine data from various external sources and return as JSON. It is currently using an InMemory cache implementation to cache individual external calls at the data layer. The first request to a resource will fetch all data required and any subsequent requests for the same resource will get results from the cache. We have a 'cache runner' that is implemented as a background process that updates the information in the cache at certain set intervals. We have added locking around the code that fetches data from the external resources. We have also implemented the services to fetch the data from the external sources in an asynchronous fashion so that the endpoint should only be as slow as the slowest external call (unless we have data in the cache of course). This is done using the System.Threading.Tasks.Task class. Could we be hitting a limitation in terms of number of threads available to the process?

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• NTPD seems to delete all network interfaces

  - by Aurelin

  We have a couple of virtual interfaces configured on eth0 on a CentOS, and every now and then, they went down seemingly out of the blue. Now after going through the log files, I found out that apparently ntpd deletes all eth0 interfaces, and that dhclient automatically brings eth0 back up. The virtual interfaces, however, stay down which causes several of our websites to be inaccessible. Can someone explain to me why ntpd deletes interfaces? Can / should that be turned off, or can / should I configure dhclient to bring the virtual interfaces back up automatically, too? EDIT// The log files that I should've posted : Nov 12 13:10:28 raptor dhclient[20048]: DHCPREQUEST on eth0 to 255.255.255.255 port 67 (xid=0x6a825e97) Nov 12 13:10:42 raptor dhclient[20048]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 (xid=0x24554092) Nov 12 13:10:42 raptor dhclient[20048]: DHCPOFFER from 96.126.108.78 Nov 12 13:10:42 raptor dhclient[20048]: DHCPREQUEST on eth0 to 255.255.255.255 port 67 (xid=0x24554092) Nov 12 13:10:42 raptor dhclient[20048]: DHCPACK from 96.126.108.78 (xid=0x24554092) Nov 12 13:10:42 raptor ntpd[2109]: Deleting interface #31 eth0, 50.116.50.97#123, interface stats: received=3255, sent=3256, dropped=0, active_time=1559394 secs Nov 12 13:10:42 raptor ntpd[2109]: Deleting interface #32 eth0:0, 50.116.53.56#123, interface stats: received=3, sent=0, dropped=0, active_time=1559391 secs Nov 12 13:10:42 raptor ntpd[2109]: Deleting interface #33 eth0:1, 66.175.211.192#123, interface stats: received=2, sent=0, dropped=0, active_time=1559389 secs Nov 12 13:10:42 raptor ntpd[2109]: Deleting interface #34 eth0:2, 50.116.53.95#123, interface stats: received=3, sent=0, dropped=0, active_time=1559387 secs Nov 12 13:10:42 raptor ntpd[2109]: Deleting interface #35 eth0:3, 97.107.132.32#123, interface stats: received=2, sent=0, dropped=0, active_time=1559385 secs Nov 12 13:10:42 raptor ntpd[2109]: Deleting interface #36 eth0:4, 50.116.56.201#123, interface stats: received=2, sent=0, dropped=0, active_time=1559383 secs Nov 12 13:10:42 raptor ntpd[2109]: Deleting interface #37 eth0:5, 66.175.212.121#123, interface stats: received=2, sent=0, dropped=0, active_time=1559381 secs Nov 12 13:10:42 raptor ntpd[2109]: Deleting interface #38 eth0:6, 66.175.215.137#123, interface stats: received=2, sent=0, dropped=0, active_time=1559379 secs Nov 12 13:10:44 raptor NET[1573]: /sbin/dhclient-script : updated /etc/resolv.conf Nov 12 13:10:44 raptor dhclient[20048]: bound to 50.116.50.97 -- renewal in 32692 seconds. Nov 12 13:10:45 raptor ntpd[2109]: Listening on interface #39 eth0, 50.116.50.97#123 Enabled The eth0 config : DEVICE="eth0" ONBOOT="yes" BOOTPROTO="dhcp" IPV6INIT="no" IPADDR=50.116.50.97 NETMASK=255.255.255.0 GATEWAY=50.116.50.1 And the virtual interfaces (I posted the first one only, they look the same for the most part) : # Configuration for eth0:0 DEVICE=eth0:0 BOOTPROTO=none # This line ensures that the interface will be brought up during boot. ONBOOT=yes # eth0:0 IPADDR=50.116.53.56 NETMASK=255.255.255.0

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• NAT, iptables and problematic ports

  - by Rajie

  I am building a small office network with virtual machines. My schema is this: Computer A: gateway, ip 1.1.1.1, iptables used for NAT [eth0=public internet dhcp, dhcp; eth1=gateway] Computer B: client, ip 1.1.1.2, using gateway from Computer A. NAT is working, and Computer B can access the internet using the A's gateway. I redirected some incoming ports from A to B (for instance, if A receives a request to port 80, it goes automatically to Computer B's Apache). The thing is that I do not really understand how to open/close ports for Computer B from Computer A. I know how to close a port: iptables -A INPUT -p tcp --dport 80 -j DROP And it will refuse all incoming (not output) connections to port 80. However, this works for main interface eth0. I tried to, for instance, drop ingoing and outgoing connections for Computer B, port 80: iptables -A FORWARD -i eth1 -o eth0 -p tcp --dport 80 -j DROP iptables -A FORWARD -i eth0 -o eth1 -p tcp --dport 80 -j DROP But it does not work. And I cannot figure out what I am doing wrong. Any clue?

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• Are there any tools for monitoring individual Apache virtual hosts in real-time?

  - by Dave Forgac

  I'm looking for a way to monitor and record Apache traffic, separated by virtual host. I am currently using Munin to capture this and other data for the entire server however I can't seem to find a way to do this by vhost. This link describes using a module called mod_watch which is apparently no longer in development: http://www.freshnet.org/wordpress/2007/03/08/monitoring-apaches-virtualhost-with-munin/ The file that is listed as being compatible with Apache 2.x is reported to have problems with missing vhosts an reporting data correctly. Does anyone know of a reliable way to determine real-time traffic per vhost? If I can find this it should be easy enough to write a new Munin plugin. Edit: What I'd really like to see is something similar to the Apache server-status scoreboard page with the number of connections / requests separated by virtual host. This would give me the ability to check which vhost may be experiencing a spike in traffic in real time and would also provide the data needed for a Munin module (or some alternative performance monitoring / analysis system.)

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• Device cannot be added on software-raid-1 array on Ubuntu 12.04

  - by George Pligor

  Unfortunately all tutorials I have found online until now on how to setup software-raid-1 are outdated on ubuntu 12.40 My target is to setup it on a system with a secondary disk drive that is already running. Format is not an option! I am trying to follow and adapt from 11.10 to 12.04 the following tutorial: http://www.howtoforge.com/how-to-set-up-software-raid1-on-a-running-lvm-system-incl-grub2-configuration-ubuntu-11.10-p2 On the above tutorial there is a successful command which creates a raid-1 array by setting the first disk drive with the installed system as missing: mdadm --create /dev/md0 --level=1 --raid-disks=2 missing /dev/sdb1 But when the time comes to add the first main drive with the installed system on the raid-array with this command: mdadm --add /dev/md0 /dev/sda1 I receive an error message. The error message says that the device /dev/sda is (which makes sense) busy! Note: hardware raid solution is not available since the system is a laptop with two disk drives! Thank you

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• A special user does not appear in Windows login screen

  - by shayan

  In the list of users (under Local Users and Groups in my Windows 7) I have an ASPNET user (its description says "Account used for running the ASP.NET worker process (aspnet_wp.exe)" and its full name is "ASP.NET Machine Account") The thing is this user does not appear in Windows login screen. What I have found: It is not a "Built-in security pricipal" user It belongs only to Users group I don't have HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts key in my registry In every sense I can see that it is a normal user yet it does not appear in login screen. Now the questions are: What does make it special? How can I create a user like this?

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• ADSIEdit freezes gettings properties of a group with hundred of thousands members

  - by ixe013

  Doing performance testing on an AD-LDS (Server 2008 R2 64 bits), we created a milion user in a single OU. We also created a single group object and made those milion users member of that group. When we try to list the milion of users ADSIEdit times out with an error message saying it cannot display that many users. Fine. But if we open the properties for the group, ADSIEdit freezes, eating up all available memory and CPU trashing (nearly 60M page faults in under an hour). AD-LDS (running on another computer) is barely hitting the 1% CPU mark, servicing other ldap requests as if nothing were. We can throw more memory at the problem, but more users will have to be managed one day and we will be back at square one. Is there a way to set a limit in ADSIEdit so that it will not hang the computer when retreving a very large multi-value object ?

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