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• After a week of smooth running, my Dell t310 servername reverted to the service tag and screwed everything up!

  - by user779887

  Has this happened to anyone else? Began having a tremedous amount of problems with our brand new Dell SBS 2011 T310 server and after nearly 15 hours will Dell support, they determined that the server name hade reverted to DXXXXXXXX ("D: + the service tag). The Dell tech said that this was a major major problem. I'm the only person with any access to the machine and I didn't attempt to change the server name. The tech said it didn't look as if anyone had hacked the box but something had replaced "OurCompanyServer" with "DXX12XX" It would seem to me, simply changing the server name back to what I originally had would correct the problem, but the Dell tech said it wasn't that easy. Anyone encounter this?

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• Eliminate single point of failure for webservers?

  - by George Bailey

  I know in DNS, that each of the DNS servers will be tried to see if they will respond I know in email that in the event of a failure it will go to the next one in the list or it will hold the mail for a period of time As far as I know,, in webservers,, the browser will get one of the webserver IP addresses and try it and if it fails it will give up. Is this correct? If so,, then the only way to direct traffic away from a failed IP address would be with the DNS servers.. and even that would not update immediately?

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• APC has no system cache entries

  - by lazzio

  I have 2 web servers to provide PHP websites. One server is : Apache + PHP-FPM + APC The other : Apache with MPM-itk + APC. For both of these servers, APC has no cache system entries but only users cache entries as you can see on the screenshot. APC with only users cache entries APC configuration is : apc.cache_by_default 1 apc.canonicalize 1 apc.coredump_unmap 0 apc.enable_cli 0 apc.enabled 1 apc.file_md5 0 apc.file_update_protection 2 apc.filters apc.gc_ttl 3600 apc.include_once_override 0 apc.lazy_classes 0 apc.lazy_functions 0 apc.max_file_size 2 apc.mmap_file_mask apc.num_files_hint 1000 apc.preload_path apc.report_autofilter 0 apc.rfc1867 0 apc.rfc1867_freq 0 apc.rfc1867_name APC_UPLOAD_PROGRESS apc.rfc1867_prefix upload_ apc.rfc1867_ttl 3600 apc.shm_segments 1 apc.shm_size 256 apc.stat 1 apc.stat_ctime 0 apc.ttl 7200 apc.use_request_time 1 apc.user_entries_hint 4096 apc.user_ttl 7200 apc.write_lock 1 Does anyone know why APC acts like this and how to make it work well ? Thank you for your help!

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• Volume expanded in Volume Group, old disk reduced but still in use in system

  - by Yurij73

  Tryed to add a new hard sdb (not formated) to my virtualbox Centos. Successfully extended an existing vg_localhost to /dev/sdb/ # lvdisplay --- Logical volume --- LV Path /dev/vg_localhost/lv_root LV Name lv_root VG Name vg_localhost LV UUID DkYX7D-DMud-vLaI-tfnz-xIJJ-VzHz-bRp3tO LV Write Access read/write LV Creation host, time localhost.centos, 2012-12-17 LV Status available # open 1 LV Size 18,03 GiB Current LE 4615 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sdb 8:16 0 20G 0 disk +-vg_localhost-lv_root (dm-0) 253:0 0 18G 0 lvm / +-vg_localhost-lv_swap (dm-1) 253:1 0 2G 0 lvm [SWAP] sda 8:0 0 9G 0 disk +-sda1 8:1 0 500M 0 part /boot +-sda2 8:2 0 8,5G 0 part sr0 11:0 1 1024M 0 rom df -h /dev/mapper/vg_localhost-lv_root 6,5G 6,2G 256M 97% / tmpfs 499M 200K 499M 1% /dev/shm /dev/sda1 485M 78M 382M 17% /boot it still old sda in use, what i have to do further?

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• How can I get the current OU with a PowerShell login script?

  - by Frans

  I am setting up a Terminal Server 2008 which will be used by different client organisations, each with multiple individual user accounts. I would like each client organisation to have a drive mapped to \server\clients\ Their OU name is also their client name, so I would like to be able to find their current OU and then use it for the mapping command. The OUs are hierarchicals, so it is the bottom-most OU name I need. Example OU: Dedicated Clients\AjaxCorp Should get a drive mapped to \\server1\shares\AjaxCorp Any suggestions on how I can get the OU? I am sure it must be easy, I just haven't figured it out... I did find information about how to do this with VB script, but as it is a whole new environment I thought it would be nice to use PowerShell instead.

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• excel autocomplete combo-box with on-selection event

  - by IttayD

  Hi, I have an excel sheet for groceries. One column is the name, another is whether to buy it or not (checkbox) and another is the amount. I'd like to have a widget in the top row so that I start typing an item's name and it shows a list of matching items that I can select from, or if I continue to type and there's only one item, completes its name. When the last item is selected, other widgets show the amount, which I can edit and clicking 'check' will check the item in the list. I know this is kind of very specific, but am hoping someone can at least get me started. Thank you, Ittay

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• Do TCP connections work differently within the same subnet?

  - by Dean

  I've encountered some network behaviour that confuses me while trying to get Java RMI working. I use netcat to connect to a local machine: [my_machine]$ nc -w 1 192.168.0.100 60000 && echo success success I try to do the same to my server: [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success This doesn't work, unless I explicitly listen on the server socket: [amazon_ec2]$ nc -l 60000 [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success success For the version that fails, the SYN packet receives a RST, ACK in response. I'm not too knowledgable about this stuff, at this point I only have wild theories such as the one in the question. Any ideas? Potentially useful details: Local Machine (192.168.0.100) - Macbook Remote Machine (Amazon EC2) - Amazon Linux AMI 2012.03 Security Group Settings: 22 (SSH) 0.0.0.0/0 1099 0.0.0.0/0 49152-65535 0.0.0.0/0 "iptables -L" shows no rules set

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• When load balancing, must all copies of static web page be exactly the same?

  - by Gilles Blanchette

  I am used to get answers for everything on the web, but not this time... Yesterday I enable Amazon DNS weight functionally to load balance 7 websites between two different IP addresses (split 50%-50%). Both servers run IIS 8.5, sites runs well on both sides. Today I found out that Google WebMasterTools is reporting fails error with file robots.txt, all close to 50% of access try errors. The robots.txt file is ok and accessible (even via Google testing URL page) on both servers. Lets say current version of static web pages are on the first computer and the updated version of the same web pages are on the second computer. Can it be the problem? When load balancing, can static web pages be slightly different from one host server to the other? Thank you for your help

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• forward same port but for two different IPs (cisco)

  - by Colin

  Hi! I have a cisco running IOS 12.0(25) responding to two different IPs addresses: IP_A and IP_B. Behind this router I also have two different servers: server_A and server_B. What I want is to forward port 22 to both servers, so: IP_A, port22 -> server_A, port22 IP_B, port22 -> server_B, port22 ATM this only works for one of them (server_A), this is my config: interface Ethernet0/0 description Internet ip address IP_A 255.255.255.0 ip address IP_B 255.255.255.0 secondary no ip directed-broadcast ip nat outside no ip mroute-cache no cdp enable ip nat pool pool_A IP_A IP_A netmask 255.255.255.0 ip nat pool pool_B IP_B IP_B netmask 255.255.255.0 ip nat inside source list A pool pool_A overload ip nat inside source list B pool pool_B overload ip nat inside source static tcp server_B 22 IP_B 22 extendable ip nat inside source static tcp server_A 22 IP_A 22 extendable access-list A permit server_A access-list B permit server_B

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• AWS VPC - why have a private subnet at all?

  - by jkim

  In Amazon VPC, the VPC creation wizard allows one to create a single "public subnet" or have the wizard create a "public subnet" and a "private subnet". Initially, the public and private subnet option seemed good for security reasons, allowing webservers to be put in the public subnet and database servers to go in the private subnet. But I've since learned that EC2 instances in the public subnet are not reachable from the Internet unless you associate an Amazon ElasticIP with the EC2 instance. So it seems with just a single public subnet configuration, one could just opt to not associate an ElasticIP with the database servers and end up with the same sort of security. Can anyone explain the advantages of a public + private subnet configuration? Are the advantages of this config more to do with auto-scaling, or is it actually less secure to have a single public subnet?

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• Iptables: masquarading and routing

  - by nixnotwin

  I have a WAN router which is linked to isp over a /30 WAN subnet. But it also servers as a router to a /29 local public WAN subnet which is connected to few of my servers. The traffic from /29 gets routed to ISP via /30 subnet. For a wired reason I want to masqarade (NAT) the interface which has /30 ip. So the interface with /30 ip should appear as masquaraded for my 192.168.1.0/24 network and it also should act as a normal non-NAT router for my WAN public subnet /29. Can this be done with iptables on a Linux machine?

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• crontab still sending emails even with > /dev/null

  - by user2344668

  I have a crontab (root) that runs a script and output is set to /dev/null but I always get the emails whenever it runs. I only want to receive error emails. # Rackspace driveclient update (12pm MST) 0 12 * * * /root/scripts/driveclient-update > /dev/null The only way I can get it to turn off is to use /dev/null 2&1 but then I won't get error emails. This is happening on three different CentOS servers, two are 6.3 and one is 6.4. NOTE: I have read over and over that /dev/null is supposed to send stdout there and prevent the email if there is nothing but stdout from the script, so at works for at least some people; I cannot figure out why it is not working on these servers. Here's an example of where /dev/null is supposed to work: http://www.alphadevx.com/a/384-Suppressing-Cron-Job-Email-Notifications

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• How should we serve files in a small bioinformatics cluster?

  - by cespinoza

  We have a small cluster of six ubuntu servers. We run bioinformatics analyses on these clusters. Each analysis takes about 24 hours to complete, each core i7 server can handle 2 at a time, takes as input about 5GB data and outputs about 10-25GB of data. We run dozens of these a week. The software is a hodgepodge of custom perl scripts and 3rd party sequence alignment software written in C/C++. Currently, files are served from two of the compute nodes (yes, we're using compute nodes as file servers)-- each node has 5 1TB sata drives mounted separately (no raid) and is pooled via glusterfs 2.0.1. They each have as 3 bonded intel ethernet pci gigabit ethernet cards, attached to a d-link DGS-1224T switch ($300 24 port consumer-level). We are not currently using jumbo frames (not sure why, actually). The two file-serving compute nodes are then mirrored via glusterfs. Each of the four other nodes mounts the files via glusterfs. The files are all large (4gb+), and are stored as bare files (no database/etc) if that matters. As you can imagine, this is a bit of a mess that grew organically without forethought and we want to improve it now that we're running out of space. Our analyses are I/O intensive and it is a bottle neck-- we're only getting 140mB/sec between the two fileservers, maybe 50mb/sec from the clients (which only have single NICs). We have a flexible budget which I can probably get up $5k or so. How should we spend our budget? We need at least 10TB of storage fast enough to serve all nodes. How fast/big does the cpu/memory of such a file server have to be? Should we use NFS, ATA over Ethernet, iSCSI, Glusterfs, or something else? Should we buy two or more servers and create some sort of storage cluster, or is 1 server enough for such a small number of nodes? Should we invest in faster NICs (say, PCI-express cards with multiple connectors)? The switch? Should we use raid, if so, hardware or software? and which raid (5, 6, 10, etc)? Any ideas appreciated. We're biologists, not IT gurus.

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• SVN Active Directory authentication with ProxyPass redirect in the mix

  - by Jason B. Standing

  We have a BitNami SVN stack running on a Windows machine which holds our SVN repository. It's set up to authenticate against our AD server and uses authz to control rights. Everything works perfectly if Tortoise points at http://[machine name]/svn However - we need to be able to access it from http://[domain]/svn. The domain name points to a linux environment that we're decommissioning, but until we do, other systems on that box prevent us from just re-pointing the domain record. Currently, we've got a ProxyPass record on the linux machine to forward requests through to http://[machine name]/svn - it seems to work fine, and the endpoint machine asks for credentials, then authenticates: but when that happens, the access attempt is logged as coming from the linux box, rather than from the user who has authenticated. It's almost like some element of the credentials aren't being passed through to the endpoint machine. Has anyone done this before, or is there other info I can give to try to make sense of this problem, and figure out a way to solve it? Thankyou!

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• mysql -e option with variable data - Pass the variable value to insert sql statement in shell script

  - by Ahn

  The following shell script is not inserting the data to the table. How to pass the variable value to insert sql statement in a shell script. id=0 while true do id=`expr $id + 1`; mysql -u root -ptest --socket=/data/mysql1/mysql.sock -e 'insert into mytest1.mytable2(id,name) values (' $id ',"testing");' echo $id >> id.txt done I have modified the script as below and tried, and still having the issue id=0 while true do id=`expr $id + 1`; # mysql -u root -ptest --socket=/data/mysql1/mysql.sock1 -e 'insert into mytest1.mytable1(name) values ("amma");' mysql -u root -ptest --socket=/data/mysql1/mysql.sock -e 'insert into mytest1.mytable2(id,name) values ( $id ,"testing");' echo $id >> id.txt done error : ]$ ./insert ERROR 1054 (42S22) at line 1: Unknown column '$id' in 'field list'

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• How much does a IPtables router slow down a connection?

  - by RayQuang

  Hi, I would like to know if introducing a new gateway in my network will slow things down. The question may sound unclear but here is an illustration: Before Installing gateway server Main Router <=> switches <=> servers after installing gateway Server Main Router <=> IPtables router <=> switches <=> servers My question is. How much will this delay incoming outgoing requests / file transfers. thanks, RayQuang

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• Will this SPF record restrict delivery of email for the original domain?

  - by user199421

  As part of the product we offer we send emails on behalf of our clients. Because the emails don't come from an IP associated with the client they are sometimes flagged as spam. We advised some of our clients to add an SPF record approving us to send emails on their behalf. We saw immediate improvement in deliverability rates after making the change however one of our clients was notified by his hosting provider that the SPF record we suggested to add would "slightly restrict" all emails that don't come from our servers (including our client's own servers). The record we use is this: v=spf1 a mx include:ourdomain.com ~all So my question is if the warning we received about this is correct and if so why and what can be done to solve this (allow sending email both from original domain and by ourselves).

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• What is the "real" difference between a NAS and NFS? Or, why pick a NAS device over "mere" NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over a standard ethernet port, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over just running NFS on servers?

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• Safe to use high port numbers? (re: obscuring web services)

  - by sofakng

  I have a small home network and I'm trying to balance the need for security versus convenience. The safest way to secure internal web servers is to only connect using VPNs but this seems overkill to protect a DVRs remote web interface (for example). As a compromise, would it be better to use very large ports numbers? (eg. five digits up to 65531) I've read that port scanners typically only scan the first 10,000 ports so using very high port numbers is a bit more secure. Is this true? Are there better ways to protect web servers? (ie. web guis for applications)

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• Can't connect to server from certain machines

  - by Joel Coel

  On a small college campus we have a VLAN setup for the computer labs. These machines get assigned IP addresses in the 192.168.7.xxx range. In the server room, all of the server are on the default VLAN and assigned an IP address in the 10.1.1.xxx range. For the most part this works, but the lab machines are unable to connect to one of the servers. They can't even ping it. They can talk to other servers on the same switch as this server just fine. At first I thought it might be a vlan issue, but I changed the server port vlan to match other known-working ports with no effect. Any ideas?

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• Safe to use high port numbers? (re: obscuring web services)

  - by sofakng

  I have a small home network and I'm trying to balance the need for security versus convenience. The safest way to secure internal web servers is to only connect using VPNs but this seems overkill to protect a DVRs remote web interface (for example). As a compromise, would it be better to use very large ports numbers? (eg. five digits up to 65531) I've read that port scanners typically only scan the first 10,000 ports so using very high port numbers is a bit more secure. Is this true? Are there better ways to protect web servers? (ie. web guis for applications)

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• Change Scan-to-PC list names on Brother MFC-8890DW Printer

  - by dralezero

  I have two Brother MFC-8890DW. When scanning over the network, it shows a list of PCs (on the scanner display) to save to that have the software/drivers installed. Each PC is listed as the name of the employee for that computer. I have setup a third MFC-8890DW and installed on these computers. The list, however, is the computer name. Somehow it is possible to customize the name. Brother support did not know. I couldn't find anything in manuals. I thought I remember setting up those names before.

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• Updating Applications in a Corporate Environment

  - by user145133

  I am very new to this subject and was hoping someone could shed some light on it. I am working on creating a corporate network that will obviously have multiple servers and multiple workstations. Let's say a new version of Adobe Flash comes out. I would think that you would want to test this update in a test environment before "pushing it out" to the servers and workstations. How do you guys go about controlling, testing and then pushing the application updates out? (i am not talking about windows updates). Do you use a 3rd party sysadmin tool? Home grown software? Any info will greatly be appreciated :)

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• Rsync to take the newest file. And a cron job?

  - by user1704877

  I have a log file on two different servers. The servers are under a load balancer so half the traffic goes to one server, and half the traffic goes to the other server. I need to take the newest log file from one machine and transfer that log file to the other machine. So if one log file is changed on one server, it gets updated on the other server. I think I need to use rsync. And do I also need to put it in a cron job?

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• TFS 2012 or TFS Azure (Preview)

  - by Fore

  We want to migrate our current TFS 2010 solution that's hosted today in one of our own servers to TFS 2012 hosted somewhere else. We don't want to handle the servers any more, and therefor are looking at alternatives. TFS preview / Azure is one alternative, hosted in the cloud, but I'm not that happy with forcing users to use live id, and we don't have an AD. My second thought was to create a Azure virtual mashine, and there install and host TFS 2012. Is there any downsides with this? Compared to the price of bying a VPS this is cheap and feels reliable in Azure? Do you have any other ideas?

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