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• Full speed internal switch bandwidth but per-port set external bandwidth?

  - by garg

  I am in an environment where all the machines are behind a switch that I don't have access to. Each ethernet wall port has limited bandwidth depending on how much has been paid for each port. The problem is that some people have 10Mbps connections and some have 100Mbps connections and this causes problems with local intranet file transfers and operating system/software deployments. Operating systems can take hours to be deployed if the machine is on 10mbps. Do you know if it is possible with most switches to set a rule that would limit bandwidth coming in/going out to an extranet, but keep full bandwidth if the packets are destined to go to a local machine? For example, the internet might be limited to 10Mbps, but internal servers would get gigabit speeds? Thanks

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• OSX 10.6 integration into NIS/netgroup/automount infrastructure

  - by mdpc

  I have an existing infrastructure where accounts are maintained under NIS (yp) with no local unix accounts. Also, all the standard maps including hosts, mail aliases, netgroups, etc...are maintained in this form. Extensive use of the UNIX/Linux automounter with items scattered over the network on NFS servers. There are NO ACLs on any local or shared files. All mail needs to use basically the nullclient sendmail configuration feeding into a different system. I now have a requirement to integrate an Apple OSX 10.6 system into this environment and make it run seamlessly. My initial reading and second-hand information seems to indicate that this may not be possible on the native OSX 10.6 system. I'm concerned. Any ideas as to how to accomplish this task and make everybody happy? Thanks PS: I have never used an Apple OSX system.

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• How to detect hard disk failure?

  - by Devator

  So, one of my servers has a hard disk failure. It's running software RAID, the system locked up and according to /proc/mdstat (and /var/log/messages), it's really down: Personalities : [raid1] md2 : active raid1 sdb2[1] 104320 blocks [2/1] [_U] md5 : active raid1 sdb5[1] 2104448 blocks [2/1] [_U] md6 : active raid1 sdb6[1] 830134656 blocks [2/1] [_U] md1 : active raid1 sdb1[1] 143363968 blocks [2/1] [_U] and Nov 5 22:04:37 m38501 smartd[4467]: Device: /dev/sda, not capable of SMART self-check However when I do smartctl -H /dev/sda, it passes the test. It also passes the test with smartctl --test=short /dev/sda. So, is smartctl a broken testing tool, or am I doing something completely off?

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• Best Solution for Load Balancing geographically distributed NFS File Access?

  - by DairyKnight

  I'm trying to find an optimum solution for accessing the NFS file share in my company. We have a central file server in North America and has 30GB~50GB of updated data everyday. And it's very slow for our Europe and Asia branches to access directly. Therefore, I'm trying to setup two replicate servers in those continents. I'm currently using rsync, but wonder if there exists a better solution acts more like a distributed RAID, which allows the user to transparently access the file whether synced or not. And user request will be dispatched to remote server if the file is not yet synced. I'm now looking into DRBD, but it seems not to have the functionality of auto-dispatching requests. Does anyone know if there's a better solution?

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• (simple) linux HA with vmware vsphere?

  - by derhelge

  I hope my upcoming question is specific enough, and you are able and willing to support :-) We have several openSUSE VMs in an ESX-Cluster (three ESX-Servers) with an attached iSCSI-SAN. All of those Linux VMs are "single point of failure"-configured, which means in the case of a Web-Server: LAMP, storage, etc. everything on this machine. This was very simple and in case of a failure (in the last years: kernel panics or apache crashes) a simple reboot triggered by a script did it. But the problem is: How to upgrade/maintain the w(eb-)application or the underlying OS without downtime? This wasn't really managable and i did this in the early morning ;) How can i achieve a "simple" High-Availability Cluster now? I thought of: DRBD with heartbeat with 2 VMs. And for the storage a RDM (raw device mapped) LUN and change the read-write-permissions for both VMs. Is this a good idea? Anyone has a better solution?

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• Access losing db connections

  - by Dwight T

  I have a weird problem going on at work. People have been using MS Access to connect to sql server db and lately people are getting sporadic problems with connecting to the servers. It's not always the same users and it's not always a problem, which makes it a real pain to try to solve. One example of a related problem. A person has a linked table to a table and she would filter the table or write a query on the table to return where itemsku = 'ABCD1234'. It would return one record but the ItemSku LMKN7486 and everytime it would return the wrong record but consistently the wrong record so itemsku abcd1234 always returned LMNK7486 One would think it might be a driver problem, but it also could be a user problem. Just posting the question to see if anyone else has had similar senerios. Thanks

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• Which version of Windows Server 2008?

  - by dragonmantank

  One of the projects I'm working on is looking like we're going to need to migrate from CentOS 5.4 over to something else (we need to run Postgresql 8.3+, and CentOS/RHEL only support 8.1), and one of the options will be Windows Server. Since 2008 R2 is out that's what I'm looking at. I'll need to run Postgres and Tomcat and don't really require anything that Windows has like IIS (if I can run Server Core, even better!). The other kicker is it will be virtualized through VMWare ESXI 4.0 so that we have three separate boxes: development, Quality, and Production servers. From a licensing standpoint though, and I good enough with just the Web Server edition? Am I right in assuming that will be three licenses? Or should I just jump up to Enterprise so that I get 4 VM licenses?

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• consequences of changing uid/gid on snow leopard

  - by Peter Carrero

  ok, so I introduced a Mac laptop to my home network of Kubuntu hosts and Fedora servers. Currently I don't have NIS or LDAP setup (I got only 2 users) and I just manually setup the UID/GID on the hosts. I would like to run the following command on my Macbook: dscl . -change /Users/me UniqueID 501 1000 dscl . -change /Users/me PrimaryGroupID 20 503 chown -R 1000:503 /Users/me dscl . append /Groups/staff GroupMembership me Before I go on to hose my new Mac, I would like to know if this is the right thing to do and, if so, what are the adverse consequences I may have. Thanks.

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• Fix a tomcat6 error message "/bin/bash already running" when starting tomcat?

  - by Andrew Austin

  I have a Ubuntu 10.04 machine that has tomcat6 on it. When I start tomcat6 with /etc/init.d/tomcat6 start I get * Starting Tomcat servlet engine tomcat6 /bin/bash already running. and the server fails to start. Unfortunately, there is nothing in /var/log/tomcat/catalina.out to help debug the issue. With some cleverly placed echo statements it seems to be the line from /etc/init.d/tomcat6: start-stop-daemon --start -u "$TOMCAT6_USER" -g "$TOMCAT6_GROUP" \ -c "$TOMCAT6_USER" -d "$CATALINA_TMPDIR" \ -x /bin/bash -- -c "$AUTHBIND_COMMAND $TOMCAT_SH" The only thing I've changed in this script is TOMCAT6_USER=root. In servers.xml, the only thing I've changed is <Connector port="80" protocol="HTTP/1.1" from port 8080. I have tried reinstalling the package by first removing everything sudo apt-get --purge remove tomacat6 and then sudo apt-get install tomcat6 but this has not solved the issue. I have also restarted the server multiple times in hopes of some magic. Everything was working until I restarted my server. Any ideas?

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• LDAP Authentication for multiple AD Domains

  - by TrevJen

  I have 3 full trust domains (2 child and one root). I need to use LDAP to allow authntication for domain users. The trick is that I need the application to use an AD server for the child domain BUT proxy the LDAP query and authentication for the root domain. I see that it maty be possible with AD LDS and some trusts and synching, but it looks pretty hairy and overly complicated. The short of it is: 3 domains (Parent, ChildA, ChildB) My 3rd party app will need to use ChildA domain servers to authenticate either: a. a user in the parent domain or b. a user in the ChildB domain I already have full trusts between all domains, and regular NTLM authentication works fine (unless you are trying to authenticate with LDAP)

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• How to delete system default printer forms?

  - by matt wilkie

  On Windows there are system default printer forms which can't be deleted from the Print Server Properties dialog. Is there some other way they can be removed? We are never going to use page sizes like Envelope, B5(JIS), US Std Fanfold, etc. and I'd like to save users (and myself!) from having to scroll through a big long list of noise. Our print servers are Windows Server 2003 if that makes any difference. thanks.

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• IIS 7.x Application Pool Best Practices

  - by Eric

  We are about to deploy a bunch of sites to some new servers. I have the following questions about application pools: 1) It seems advisable to have an application pool per website. Are there any caveats to this approach? Can one application pool, for example, hog all the CPU, Memory, Etc...? 2) When should you allow multiple worker processes in an application pool. When should you not? 3) Can private memory limit be used to prevent one application pool from interfering with another? Will setting it too low cause valid requests to recycle the application pool without getting a valid response? 4) What is the difference between private and virtual memory limits? 5) Are there compelling reasons NOT to run one application pool per site? Thanks!

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• Is there a way I can use $PATH as defined by my bash profile?

  - by Adam Backstrom

  I spend most of my day ssh'd into servers. I have a series of aliases/functions/scripts that allow me to type p hostname from the terminal and execute GNU screen(1) on the remote side, using the following command: exec ssh hostname -t 'screen -RD'` I've only recently noticed that ssh -t does not get my custom $PATH. Here's some terminal output: adam@workstation:~:0$ sh server 'echo $PATH' /home/adam/bin:/usr/local/bin:/bin:/usr/bin:/opt/git/bin:/opt/git/libexec/git-core adam@workstation:~:0$ ssh server -t 'echo $PATH' /usr/local/bin:/bin:/usr/bin Connection to uranus.plymouth.edu closed. My biggest problem is my custom aliases only try to execute screen, since I can't guarantee an absolute path, and my $PATH is structured so the shell should find the correct one. If my $PATH settings aren't honored, my scripts don't work. Is there a way I can use $PATH as defined by my .bashrc/.bash_profile? I believe PermitUserEnvironment is disabled.

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• autofs mac os x afp not loading as correct user?

  - by Stephen Furlani

  Hello, I am way out of my depth, and I am trying to get all of my nodes on a cluster to mount a drive on my head node. I've got /etc/auto_master and /etc/auto_afp configured according to Apple's "Autofs: Automatically Mounting Network File Shares in Mac OS X" White Paper: /etc/auto_master +auto_master # Use directory service /net -hosts -nobrowse,hidefromfinder,nosuid /home auto_home -nobrowse,hidefromfinder /Network/Servers -fstab /- -static /- auto_afp /etc/auto_afp /Volumes/userA -fstype=afp afp://userA:[email protected]:/ /Volumes/userB -fstype=afp afp://userB:[email protected]:/ I am logged into a compute-node as userA. automount appears to mount both /Volumes/userA and /Volumes/userB to head-node.local:/Users/userA/Documents/ even though I have usernames, passwords, and user-directory specified in the afp url. If I go and login with Finder - it mounts userB appropriately. File sharing and cd/dvd sharing is enabled on all computers involved. Am I doing the right thing, and if so, what did I do wrong? -Stephen

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• best practice with memcache/php - multi memcache nodes

  - by user62835

  So I am working on a web app - that has to be built for scalability. It stores frequent MySQL querys into the cache. I have pretty much everything built and ready to go - but I am concerned on best practices on handling where to cache the data. I've talked to a few people and one of them suggested to split each key/value across all the memcache nodes. Meaning if i store the example: 'somekey','this is the value' it will be split across lets say 3 memcache servers. Is that a better way? or is memcache more built on a 1 to 1 relationship?. For example. store value on server A till it faults out - go to server B and store there. that is my current understanding from the research I have done and past experience working with memcache. Could someone please point me in the right direction in this and let me know which way is best or if I completely have this mixxed up. Thanks

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• "A device attached to the system is not functioning" when reconnecting to XenApp 6 session

  - by Paul Doom

  A few of our XenApp 6 customers are seeing issue sometimes when users move from one workstation to another and try to connect to their running session. An error box pops up with "A device attached to the system is not functioning" This is on healthy 2008 R2 servers with all Citrix hotfixes applied. After the error, the user's session must be logged out before they can get back in. This was posted here: http://forums.citrix.com/thread.jspa?threadID=273457 , but is not answered. There is nothing telling in the event logs, and it is an inconsistent problem. Has anyone else seen this issue of found a fix?

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• Options for installing software on Amazon EC2 Windows instances

  - by gareth_bowles

  I've been running Linux servers on Amazon EC2 for a while now; the experience has been great. I've recently needed to bring up a Windows server to run some Windows-only software that our product needs to use, and am running into a problem figuring out how to install the software, which is only available on DVD. With Linux I can just install packages from a Web-based repository and take advantage of EC2's fast network throughput, but so far on the Windows instance I've had to upload my ISO images to EC2 and mount them from the Windows EC2 instance. For some reason I'm getting really slow upload speeds to EC2, even though the regular upload speed from our office is pretty good (around 7Mbps). I've also tried mounting the DVD drive on my machine as a local drive on the EC2 instance via Remote Desktop, and then running the software install from the local drive, but I run into the same slow upload speed issue. Does anyone have a better way to install software from physical media onto an EC2 instance ?

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• Cloud Computing - Multiple Physical Computers, One Logical Computer

  - by Koobz

  I know that you can set up multiple virtual machines per physical computer. I'm wondering if it's possible to make multiple physical computers behave as one logical unit? Fundamentally the way I imagine it working is that you can throw 10 computers into a facility one day. You've got one client that requires the equivalent of two computers worth, and 100 others that eat up the remaining 8. As demands change you're just reallocating logical resources, maybe the 2 computer client now requires a third physical system. You just add it to the cloud, and don't worry about sharding the database, or migrating data over to a new server. Can it work this way? If yes, why would anyone ever do things like partition their database servers anymore? Just add more computing resources. You scale horizontally with the hardware, but your server appears to scale vertically. There's no need to modify your application's infrastructure to support multiple databases etc.

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• Cloud Computing - Multiple Physical Computers, One Logical Computer

  - by bundini

  I know that you can set up multiple virtual machines per physical computer. I'm wondering if it's possible to make multiple physical computers behave as one logical unit? Fundamentally the way I imagine it working is that you can throw 10 computers into a facility one day. You've got one client that requires the equivalent of two computers worth, and 100 others that eat up the remaining 8. As demands change you're just reallocating logical resources, maybe the 2 computer client now requires a third physical system. You just add it to the cloud, and don't worry about sharding the database, or migrating data over to a new server. Can it work this way? If yes, why would anyone ever do things like hand partition their database servers anymore? Just add more computing resources. You scale horizontally with the hardware, but your server appears to scale vertically. There's no need to modify your application's supporting infrastructure to support multiple databases etc.

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• Puppet nodes cant' find master, ec2 public versus internal ip addresses and hosts files

  - by Blankman

  If I setup my hosts files such that they reference all other ec2 nodes using the internal ip addresses, will this work or do I have to use the external ip addresses? Do I need to specify anything in my security group to get internal ip addresses to work? e.g. /etc/hosts ip-10-11-12-13.internal some_node_name If I do this, can I reference some_node_name anywhere in my scripts where I would have used the ip address previously? On my puppet agent servers, I have a reference to my puppet master like: public-ip-here puppet When I reboot my puppet agent's, syslog shows they couldn't find the master with the message: getaddinfo : name or service not known I did get it to work by updating /etc/default/puppet and I added to the options: --server=public-ip-here From what I read, puppet will by default try using 'puppet', and I set this in my hosts file so why wouldn't it be picking this up?

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• Multiple External IP Ranges on a Juniper SSG5

  - by Sam

  I have a Juniper SSG 5 firewall in a datacenter. The first interface (eth0/0) has been assigned a static IP address and has three other addresses configured for VIP Nat. I have a static route configured at the lowest priority for 0.0.0.0/0 to my hosting company's gateway. Now I need to configure a second IP block. I have the IPs assigned to the second interface (eth0/1) which is in the same security zone and virtual router as the first. However, with this interface enabled I (a) can't initiate outbound sessions (browse the internet, ping, DNS lookup, etc) even though I can access servers behind the firewall just fine from the outside and (b) can't ping the management IP of the firewall/gateway. I've tried anything I can think of but I guess this is a little above my head. Could anyone point me in the right direction? Interfaces: ethernet0/0 xxx.xxx.242.4/29 Untrust Layer3 ethernet0/1 xxx.xxx.152.0/28 Untrust Layer3 Routes: http://i.stack.imgur.com/60s41.png

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• One-way forest trust between geographically distributed forests using Server 2008 R2

  - by bwerks

  Hi all, I'm planning out a joinder between two domains, as would take place with contracting companies. Forests A and B exist in distant sites, and there is to be a one-way forest trust so that domain users in Forest A can be authenticated on machines in Forest B. In order to facilitate this, each forest's domain controller must be able to contact each other in order to set up & confirm the trust, but my question is what underlying networking magic must take place beneath it. So far the prevailing approach has been to maintain a VPN connection between the two sites, but the technet documentation seems to indicate that DNS forwarding may be the way to go. Is this the case? Furthermore, if DNS will suffice, does that mean that there must be a server running DNS on boundary servers in each domain so that they can be reached from across the internet? How must they be configured? Thanks!

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• MySQL Linked Server and SQL Server 2008 Express Performance

  - by Jeffrey

  Hi All, I am currently trying to setup a MySQL Linked Server via SQL Server 2008 Express. I have tried two methods, creating a DSN using the mySQL 5.1 ODBC driver, and using Cherry Software OLE DB Driver as well. The method that I prefer would be using the ODBC driver, but both run horrendously slow (doing one simple join takes about 5 min). Is there any way I can get better performance? We are trying to cross query between multiple mySQL databases on different servers, and this seems to be method we think would work well. Any comments, suggestions, etc... would be greatly appreciated. Regards, Jeffrey

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• Advise about performance for local or remote SQL Server?

  - by TruMan1

  I currently have my web server and SQL Express / MySQL server on the same server. It is on a VPS. I have been having problems with my hosting so I am thinking of separating the web and db server into 2 VPS servers. Does anyone recommend this? I am worried that changing my setup from a local DB server to a remote one will degrade performance heavily. They will not be on the same network, but will reference each other via an IP address. Anything I should be aware of?

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• Virus sending phishing emails through exchange server

  - by therulebookman

  It appears that there is a virus on my network somewhere that is sending phishing emails through my exchange server. I can see the messages in message tracking and I see many SMTP errors for NDR's and rejected connections from external servers, but I do not see any SMTP authentications and I have logging up to MAX. How can I find the IP or hostname of the PC that is infected? Or is there some other explanation than virus? Anti-virus scan on server is clean. Server is not an open relay. Thanks

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