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• How To Perform Distributed Website Monitoring?

  - by cballou

  I would like to know how sites like the following perform distributed website monitoring (from multiple checkpoints/countries). pingdom.com, site24x7.com, uptrends.com, siteuptime.com, etc, etc. To be exact, what process would occur in checking if a given domain name went down? If the server finds that the site is down, what is the next step? Would it make a REST API request to a separate server to run the same test and report the results? I have a few theories, including: utilizing host(s) from different countries utilizing proxies from different countries I'm looking for the most proper or correct way to handle this, which can include the usage of servers from multiple countries/hosts.

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• Problems with connecting to ASM instance

  - by Rodnower

  I have Oracle11 with RAC installed on RedHat 5. I have two servers with two instances one on each one. In each server I succeed connect to appropriate instance of database but not to instance of ASM. I connect with user oracle11 and type: export ORACLE_SID=+ASM1 sqlplus "/ as sysdba" It connects but write: Connected to an idle instance and when I try to access to parameters or views I have errors. For know that +ASM1 is the SID I type: ps aux | grep pmon and get: asm_pmon_+ASM1 I tried also with +ASM but it was also unsuccessfully. What is wrong here?

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• Getting out of the Helpdesk. Getting into the system administration.

  - by eric.s

  Today I found out that the job which would have been a promotion for me went to an outside candidate. The position is for a systems admin on our LAN team. I have been working on the helpdesk here for almost two years with another two years experience working it prior. While we are the first tier support we also work in AD, monitor and update certain servers and set up and deploy Windows/Mac images for those we support. What I am looking for here is what can I do to better myself to inside/outside places to move up this ladder? I take what I can from my job - working on projects that I can learn from - but what projects should I be volunteering for? What can I do for myself outside to make me a more viable candidate for a systems admin?

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• Back up of Streaming server

  - by Maxwell

  I want to take a new streaming server for my website which generally holds videos and audio files. But how do we maintain backup of the streaming server if storage size is increasing day by day. Generally on Database servers, like Sql Server, backups can be easily taken and restored very easily as they do not occupy much space for medium range applications. On the other hand how can we take backup of streaming server? If the server fails, the there should be an alternative server / solution that should decrease downtime of the server. How is the back-end architecture of YouTube built to handle this?

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• Passing all traffic through Cloudflare

  - by Nick

  I am new to Linux System Administration and I am experimenting with iptables trying to learn how to really lock down a system with them. And one thing a friend of mine recommended was that there was a way to pass all incoming traffic through Cloudflare so even if attackers resolved the server ip they still couldn't (D)dos it directly. This is exactly what they said: "Simply config your servers iptables to only allow incoming connections from CloudFlares IP ranges then set it to allow only your IP/IP range to connect on port 21 (SSH)" Could someone help me on what command I'd need to run for Ubuntu to get this effect?

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• How can I move a load of zone records from a web based system to text based one?

  - by Chris Adams

  Hi there, I have a few domains with Dreamhost where I have set a load of records using their web based domain name system, and I've like to move them to another provider that lets me enter info directly as a text file for their name server, bind 9 to use. (If you're interested, I'm moving them to Gandi.net). Previously when I used a cpanel based system to do something similar, there was a tool that let me simply enter a domain name, and any available domains were automagically entered into a system, saving me typing it myself (and bringing down sites with silly typos in the process). What open source tool can I use to query a domain for all the relevant subdomains and records and list them in a format like a zone file, that I can use with other name servers?

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• Memcached failover

  - by user25164

  We have 2 memcached servers configured and use the Eniym client. When one of the server is down, it appears this server is added to the deadServers list (ServerPool.cs) and tries to resurrect the server every 10seconds (we have configured deadTimeOut to be 10seconds). Attempting to connect to the failed server causes a TCP timeout, the pages take a long time to load which results in bad user experience. 1) What is the standard way of resolving this issue? There are some posts about removing the server from the deadServers list. Is it okay to do this? 2) What is the recommended deadTimeOut setting (I understand by default it's 2 mins and we've changed it to 10seconds in our implementation) 3) Am I correct in my understanding that the cached data is not replicated across Server 1 and Server 2? If Server 1 is down, then it goes to the database to fetch these values (and it doesn't really check Server2)? Any help is really appreciated.

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• Remote logging for multiple Apache virtual hosts using syslog-ng

  - by James

  I'm running a couple Apache web servers that each have 4-8 separate virtual hosts on each of them. I'm trying to setup a dedicated log server that stores each virtual host access and errors logs in a separate directory for that virtual host. For example on the logging server, /var/log/remove/10.0.0.2/virtualhost1 contains access_log and error_log /var/log/remove/10.0.0.2/virtualhost2 contains access_log and error_log /var/log/remove/10.0.0.3/virtualhost3 contains access_log and error_log and so on... Right now I have it split up by host but I can't figure out how to do it additionally by virtual host. Here are the relevant lines from the logging server's syslog-ng.conf source r_src { tcp(ip("0.0.0.0") port(5140)); }; destination r_all { file("/opt/splunk/logs/$HOST"); }; log { source(r_src); destination(r_all); }; Any help would be appreciated. Thanks!

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• Sharing Internet Connection using an ad-hoc wifi network

  - by Apps

  I've installed a WiFi Adapter in my Windows XP PC and created an ad-hoc network. I am able to connect to the network through my iPod Touch. On the same PC I have a LAN connection to the Internet. I need to share this internet connection to my iPod too. The problem is Windows did not assign an IP Address (even though assign IP address automatically is selected) to this WiFi network. When I tried to share the Internet connection, I got a message that LAN Network Adapter's IP address will be changed to 192.168.1.1. But if this happens I will not be able to connect to other devices/servers in my LAN Network. How do I share the Internet connection through WiFi?

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• Best practice? Using DPM to backup VMs within each VM or through the host?

  - by andrew

  We've got two Hyper-V hosts running multiple VMs (all flavors of Windows Servers). One of the VMs is running MS Data Protection Manager 2010, which runs beautifully (most of the time) and is connected to a separate NAS via iSCSI for the DPM storage. I noticed when I installed the DPM agent on the Hyper-V hosts, it enumerates the VMs in the DPM Protection listing. I don't want to burn through my storage space too fast with duplicate protection, so I was wondering: Is it recommended to back up VMs through the host, or is it better to install the DPM agent on each VM and backup as I would any other machine? It would seem as though most people (currently including me) do it the second way, but is there any advantage to including the entries under HyperV (Backup using Child Partition Snapshop)?

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• Inconsistent DNS report results on different websites

  - by Saif Bechan

  I am checking my server dns setting on different websites. intodns,dnssy,dnscog, but on all the websites i get different results. Some say my mail server settings are not good, some say i have no A records for my NS records. Only on dnssy everything looks to be ok. Should i just trust the website with the best results, or what should i do? How does this sort of inconsistency occur in the first place. I am new to servers and dns, and this makes it very misleading.

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• How do we keep Active Directory resilient across multiple sites?

  - by Alistair Bell

  I handle much of the IT for a company of around 100 people, spread across about five sites worldwide. We're using Active Directory for authentication, mostly served to Linux (CentOS 5) systems via LDAP. We've been suffering through a spate of events where the IP tunnel between the two major sites goes down and the secondary domain controller at one site can't contact the primary domain controller at the other. It seems that the secondary domain controller starts denying user authentication within minutes of losing connectivity to the primary. How do we make the secondary domain controller more resilient to downtime? Is there a way for it to cache the entire directory and/or at least keep enough information locally to survive a multi-hour disconnection? (We're all in a single organizational unit if that makes any difference.) (The servers here are Windows Server 2003; don't assume that we set this up correctly. I'm a software engineer, not an IT specialist.)

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• CentOS PAM+LDAP login and host attribute

  - by pianisteg

  My system is CentOS 6.3, openldap is configured well, PAM authorization works fine. But after turning pam_check_host_attr to yes, all LDAP-auths fail with message "Access denied for this host". hostname on the server returns correct value, the same value is listed in user's profile. "pam_check_host_attr no" works fine and allows everyone with correct uid/password a piece of /var/log/secure: Sep 26 05:33:01 ldap sshd[1588]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=my-host user=my-username Sep 26 05:33:01 ldap sshd[1588]: Failed password for my-username from 77.AA.BB.CC port 58528 ssh2 Sep 26 05:33:01 ldap sshd[1589]: fatal: Access denied for user my-username by PAM account configuration Another two servers (CentOS 5.7 Debian) authorizes on this LDAP server correctly. Even with pam_check_host_attr yes! I didn't edit /etc/security/access.conf, it is empty, only default comments. I don't know what to do! How to fix this?

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• Hosting provider that allows you to host your own VM image?

  - by Timo Geusch

  I've already looked at the 'Best Hosted VM Provider' question and checked the recommendations there, but I seem to have slightly odd requirements. Basically, I am looking for a host that allows me to host a VM image I supply (FreeBSD, which most of the suggested hosters don't support, they only seem to support various Linuxes) instead of one of their standard images. I'm a long time BSD user and have had colo BSD servers in the past so I'm pretty sure that i don't need much in the way of software support, but I'd basically like to run my server on managed hardware without having to rent the whole server. For the usage I have that would way OTT as we're talking a couple of small apps with very few users, a couple of blogs and (most importantly) email hosting for about 6-10 domains with moderate traffic levels. Oh, and reliability trumps cost to a certain extent.

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• WCF Communication Problem

  - by vincpa

  Two separate servers, one is an IIS7 web application trying to connect to a WCF service on the other server. The initial connect always fails, sometimes the second, after that, everything works normal. What could be the cause of this problem? The exception that gets thrown is EndpointNotFoundException Could not connect to net.tcp://192.168.0.83/MgrService/Manager.svc. The connection attempt lasted for a time span of 00:00:21.0289348. TCP error code 10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 192.168.0.83:808.

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• ADFS 2.0 Farm - How do I perform an immediate sync

  - by Matt

  Hi, We're using ADFS 2.0 on a windows 2008 server, it's in a farm and has the default polling interval of 5 minutes. We're making a change tonight and would rather sync immediately than wait for the other guy to update, especially as we might be making multiple changes. This Technet article mentions that I can change the polling interval or do an immediate sync between my servers: http://technet.microsoft.com/en-us/library/ee913581%28WS.10%29.aspx I checked the powershell commandlets for ADFS and I can only seem to find one that let's me set the polling interval, but not perform a 1 time immediate sync Searched the usual suspects, but just can't find a ADFS-SyncMyStuffNow command... Anyone?

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• Using LDAP Attributes to improve performance for large directories

  - by Vineet Bhatia

  We have a LDAP directory with more than 50,000 users in it. LDAP Vendor suggests maximum limit of 40,000 users per LDAP group. We have number of inactive users and those are being purged but what if we don't get below the 40,000 users? Would switching to using multivalued attribute at user record level instead of using LDAP groups yield better performance during authentication, adding new users, etc? I know most server software (portal, application servers, etc) use LDAP groups. But, we have a standardized web service interface for access control instead of relying on server software to map LDAP groups to security roles. Each application uses this common "access control web service". Security roles are used within application to build fine-grained ACL used within each enterprise application.

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• AFXR problem using gradwell secondary DNS

  - by Roaders

  Hi All I use Gradwell.com to provide secondary DNS but I keep getting e-mails along the lines of the following saying that it's not working: You have asked us to provide a secondary DNS service for the following domain(s) Unfortunately, the primary DNS server(s) you specified are not permitting the necessary zone transfers from our servers, or they are not answering "SOA" queries for your domain correctly. I have gone through the support procedure and they weren't that helpful. They have suggested the following: Our secondline team have suggested setting the AXFR to use anouther machine. This will ensure that the transfer is not locked down to one machine and should allow any machine to make the request I don't really know what AFXR is and I only have 1 production machine so I can't set the AFXR to use another one! In previous support correspondence we confirmed that I am allowing transfers to the correct IP and that I have the correct ports open on the firewall. I am running Windows Server 2003. What can I do to try and get these zone transfers working? Thanks

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• What is the harm in giving developers read access to application server application event logs?

  - by Jim Anderson

  I am a developer working on an ASP.NET application. The application writes logging messages to the Windows event log - a custom application log just for this application. However, I do not have any access to testing or staging web/application servers. I thought an admin could just give me read access to this event log to help in debugging problems (currently a service that is working in dev is not working in test environment and I have no idea why) but that is against my client's (I'm a consultant) policy. I feel silly to keep asking an admin to look at the event log for me. What is the harm in giving developers read access to application server application event logs? Is there a different method of application logging that sysadmins prefer programmers use? Surely, admins don't want to be fetching logging messages for developers all the time.

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• Gitweb showing opposite colors for added and removed text

  - by Maddy

  Hi, I have installed gitweb in our servers. And it started showing the branches and the commit diffs. But the syntax highlighting is opposite particularly for added and removed text. Supposed added text should be in green and removed text should be red. But I am seeing an opposite one. I can hack gitweb.css to get my job done. But felt like knowing why such issue is happening? And what might be the proper fix. (if any one knows good themes for gitweb? please mention)

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• VLC Media Server

  - by Josh

  We are using VLC on ubuntu, and trying to set up a streaming media server. We have the http interface working fine from remote computers, and we can also see the video playing as text if we don't screen VLC. Our problem is the output streaming. When we use the main VLC page you get when you goto the servers IP it does not save the output MRL (refreshing page it will go away, even after clicking save.) We tried to VLM page and it appears to work fine from the http page (it buffers, plays, timers go up when not paused, etc.) However, we still cannot connect remotely with a VLC client. The output parameters do save properly on the VLM page. We are noobs when it comes to this. Does anyone have a very to the point procedure of getting a file X to play and stream on ubuntu using VLC assuming VLC is installed?

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• What equipment do real ISP's use?

  - by Allanrbo

  In a dormitory of 550 residents, people often mistakenly set up DHCP servers for the whole network by plugging in their private Wi-Fi routers wrongly. Also recently, someone mistakenly configured their PC to a static IP being the same as that of the default gateway. We use cheap 3Com switches at the moment. I know that Cisco switches support DHCP snooping to solve the DHCP problem, but that still does not solve the default gateway IP takeover problem. What sort of switch equipment do real ISP's use so their customers cannot break the network for the other customers?

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• apache generating to many rotatelogs.exe on Windows?

  - by Patrick

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

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• Linux server cannot be pinged

  - by misamisa

  I have set up a Linux server in DMZ. There is another Windows server running in same DMZ. These two servers can be pinged via internet using my home PC. However, the another Linux server rented from a hosting service provider can only be pinged from the Windows Server and not from the Linux server (accessed via internet). So the situation is: Windows server (DMZ) ---ping--- Rented Server.....Successful Linux server (DMZ) ---ping--- Rented Server.......Unreachable Home PC ---ping--- Linux server (DMZ).......Successful Home PC ---ping--- Windows server (DMZ).....Successful When I ran tcpdump on my Linux Server(DMZ) and started ping from Rented Server, it showed that the Linux Server(DMZ) is receiving ping and replying. There is no restriction defined in hosts.deny and hosts.allow file that might cause this problem. What else should I check to get this working?

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• Asp.net error messages when on server are not displayed

  - by asn187

  I have been tasked with setting up asp.net websites on a windows server 2008 which are all in debug mode When browsing a website on the server and an error occurs, for example the database connection cannot be open I would expect as per normal to receive the Asp.net Server error page with an error dump Something like - http://www.codeproject.com/KB/books/1861005040/image091.gif However, what actually happens is I get random characters on the web page. For example: <?)=????*??2o????v??YK?WuZ,?6[N??f?O??b??@!???u]S??yQ?iN?&e???E???j??1z??x??????o?y????U??M???2d?i?4 This is not the correct or expected behaviour. The event log does however show what has gone wrong. How do I get the Server Error page to render properly, am I missing something in the servers asp.net setup?

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