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• Bind is updating DNS with wrong resolver info after rndc flush expires

  - by RussH

  I'm running Bind 9 on a small office server (Centos 5) with a local mailserver. There's a domain we need to email - it shows wrong DNS info for the MX servers using the local bind, so an RNDC flush updates this correctly - but then, after some time - it reverts back to the wrong resolver. I would have thought that 'rndc flush' just clears the local cache and pulls all the authoritative info down - so why is it being overwritten (by what seems like the next update)? where do I need to look? Presumably there's some named logging(?) to determine where it's getting the [new or cached] updates from?

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• sudoers security

  - by jetboy

  I've setup a script to do Subversion updates across two servers - the localhost and a remote server - called by a post-commit hook run by the www-data user. /srv/svn/mysite/hooks/post-commit contains: sudo -u cli /usr/local/bin/svn_deploy /usr/local/bin/svn_deploy is owned by the cli user, and contains: #!/bin/sh svn update /srv/www/mysite ssh cli@remotehost 'svn update /srv/www/mysite' To get this to work I've had to add the following to the sudoers file: www-data ALL = (cli) NOPASSWD: /usr/local/bin/svn_deploy cli ALL = NOEXEC:NOPASSWD: /usr/local/bin/svn_deploy Entries for both www-data and cli were necessary to avoid the error: post commit hook failed: no tty present and no askpass program specified I'm wary of giving any kind of elevated rights to www-data. Is there anything else I should be doing to reduce or eliminate any security risk?

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• BES 5.x issues when connecting to Exchange 2010 SP2 RU4

  - by makerofthings7

  Ever since we updated from SP1 RU4 to SP2 RU4 we have noticed that our BES devices will simply stop receiving email. This has occurred at least 5 times in the past few weeks. Today, while speaking with RIM support (a T3 contract), they said that they have reports of sporadic connectivity issues from some BES users. This has been occurring with Exchange 2010 SP2 RU4, and have no public information to give us. We were able to temporarily get things running by doing any or all of the following Restart the BES server Recreate the MAPI profile (deleted the keys in the registry) Restart the CAS servers Wait it out (2 hours) What other options should I take to resolve this issue?

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• FreeNAS/ZFS/Raid-Z slightly different disks

  - by muskratt

  I'm considering using FreeNAS and "recycling" some of my older 1TB disks. Two are the exact same model Western Digital while another is Seagate and the fourth is Samsung. Typically, since all disks are not equal, I'll create my arrays on a Windows-based server 1GB undersized to prevent a replacement disk not being large enough. Dell is notorious for sending replacement SATA disks of different brand---knock on wood, no problems yet. Since not all drives are created equally and they can vary a few MBs, is there a way to make the the FreeNas/ZFS/Raid-Z function in the same way I do for my Windows-based servers above? Thanks

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• how install minimum domain email piping to script in centos?

  - by Adam Ramadhan

  hello i have search google on a simple tutorial on how to make a piping email. first how does really email technically work? "stmp is a process that binds to 25, waiting for email request that goes in from another stmp process(in another server) determined by the domain MX route that will send the message to port 25 if any email goes though the MX.domain.tld" that is in a nutshell how emailing work, am i right? or there is something wrong here? second, so if im right, we need to set a SMTP server so we can receive incoming emails from MX SMTP route right? ive googled though google and found two best STMP servers from my opinion, they are EXIM and POSTFIX, can anybody give us a simple tutorial installing and setting up an email piping for a fresh installed linux/centos? example *.domain.tld -> allinonepipe.php thanks.

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• Cloud services can't be reached from complex customer infrastructure

  - by Nock

  We have several services running on a cloud, they all are hosted on Windows Server 2012 R2, have public IP address and specific port. Some of our customers can't reach them because for "some reason" the ports are cut between a firewall between them and us. (some customers are using a shared internet connection in a multi tenant office and they can't change firewall communication) Well, you get it, we don't have the possibility to make all the firewall "allowing" the communication. My customers all runs Windows 7 at least. What is the best counter solution in such case, using Microsoft (Windows Server) technologies? The best would be some kind of tunneling communication or VPN, but the customer should also be able to access his/her enterprise resources. Bby the way, today we using IPSec using Windows Firewall to secure the communication, is IPSec tunneling a solution for us? Otherwise, is there a service in Windows to enable some kind of VPN between a client and a server but only for a given set of servers?

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• How can I decrease the time spent reformatting / restoring user's workstations?

  - by CT

  I just working for a medium sized company (approx. 150 users). When user's workstations need to be reformatted for any variety of reasons, we reformat, reinstall windows from an oem disk, install drivers, install shop desired software, and restore user's documents from latest backup. While the process isn't very difficult it is very time consuming. What are some options simplify / speed up this process? Mostly a complete Windows shop with most servers running Win2k3 Enterprise and workstations running a variety of XP, Vista, and 7. Workstations are purchased through a variety of OEMs mostly Dell.

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• Windows Server Configuration Management Best Practices

  - by Anton Gogolev

  Chef/Pupper/Ansible are cool and all, but they are second-class citizens on Windows at best. We have a bunch of "snowflake" (one of a kind) machines (baremetal and virtual) that nobody really know what's going on with. What I want is to start establishing basic configuration management for said servers, starting from installing Windows, installing and enabling various Roles and Features, setting up Services, Shares, Users and deploying webapps. PowerShell DSC looks promising, but it's not yet here and appears to be over-engineered, Puppet and the like are again not first-class. There's a bunch of tooks and TLAs like Windows ADK, DISM, OCSetup, etc. and it seems to me that the "Configuration Management" story on Windows is not precisely rainbows and unicorns. What I want is a Puppet/Chef-like, lightweight tool (no System Center Configuration Management, please) which would allow us to "version-control our server infrastructure" and bring all the benefits of CM. So, where do I look for the tool that does this kind of thing?

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• Setting up IIS7 to mimic a GoDaddy shared hosting plan

  - by NerdFury

  I host multiple domains on a GoDaddy shared hosting account. I would like to setup a website locally in IIS 7 that mimics the setup of my hosted account so that I can test and debug applications locally before deploying, as debugging after deploying, or discovering there are issues after deploying is frustrating. I have created a folder WebRoot, at put my main application in that folder. I created a website in IIS 7 and pointed it at that folder. I setup bindings with a fake domain, and created a matching entry in my hosts file to make the fake domain point at my 127.0.0.1. I then created a folder www.otherdomain.com under webroot. I then created an application underneath my website, and pointed it at this folder. I can't find how I can add bindings to the web application to have it referenced as a different fake domain, rather than a subdirectory under my root domain. What would be the proper way to setup IIS to best simulate the environment on the GoDaddy servers.

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• Does setting an A record for a root domain set it (automatically) for subdomains?

  - by Edan Maor

  I bought a domain from Dreamhost, but my servers are actually running on Amazon's AWS. I have an Elastic IP, say 1.1.1.1. In the Dreamhost panel, I've added an A record for my domain name, pointing it to 1.1.1.1. My question is, are all subdomains (e.g. www.mydomain.com, a.mydomain.com, etc.) automatically mapped to 1.1.1.1 as well, because the root is? Or do I have to add separate rules for each subdomain?

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• cannot access my own computer through My Network Places

  - by WebMAOhist

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.The list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• Two domains hosted on the same server with different root folder shows up the same homepage

  - by emaillenin

  I have hosted two domains from GoDaddy at Linode VPS. They are mobiletoast.com and lesseltechnologies.com Thought the latter site has a separate index folder, whenever I navigate to it, I get the homepage of mobiletoast.com The strange thing is, I see the expected page (It works), when I open the site from my mobile phone. But when I open the site from my PC (any browser, without any cache, hard refresh), I get the homepage of mobiletoast.com The Linode support team says, they see the correct "It works" page. But I am not able to see that page. This is the output of the command apache2ctl -S root@li339-83:~# apache2ctl -S VirtualHost configuration: wildcard NameVirtualHosts and _default_ servers: *:80 is a NameVirtualHost default server mobiletoast.com (/etc/apache2/sites-enabled/000-default:1) port 80 namevhost mobiletoast.com (/etc/apache2/sites-enabled/000-default:1) port 80 namevhost blog.mobiletoast.com (/etc/apache2/sites-enabled/blog.mobiletoast.com:1) port 80 namevhost lesseltechnologies.com (/etc/apache2/sites-enabled/lesseltechnologies.com:1) port 80 namevhost mobiletoast.com (/etc/apache2/sites-enabled/mobiletoast.com:1) Syntax OK

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• aws s3 works with script but not on cron

  - by user3800017

  guys.. My first post ! hope not the last .. I have few bunch of servers on aws ec2 platforms. I made a simple script to backup my custom logs on their s3 storage bucket. The problem is the script works fine .. but I tried to add it to the crontab. And the script executes but not the s3 sync/mv part ! Here is my code: NOW=$(date "+%b_%d_%Y") MY_HOSTNAME=`uname -n` mv /opt/req/req* /opt/req/bkup/ mv /opt/response/res* /opt/req/bkup/ cd /opt/req/bkup/ tar -cvf ${MY_HOSTNAME}_req_bkup_${NOW}.tar re* rm *.txt aws s3 mv /opt/req/bkup/* s3://req `

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• How do you monitor a monitoring server?

  - by organicveggie

  So we run Groundworks (with Nagios) on CentOS to monitor our various servers and processes. I have it setup to automatically send emails and SMS texts when things reach a WARNING or CRITICAL state. Normally this works perfectly. However, twice we've had problems with Postfix on that server where Postfix decides to stop sending email. The most recent time lasted 4 days because none of us noticed. That leads me to a important question: how am I supposed to monitor my monitoring server?

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• Logging off does not kill process in Windows Server 2003

  - by user25951

  I have a Windows Server 2003(Enterprise, SP2). My understanding was that any process created by a user will be terminated when the user loggs off the account. But its not happening. I login via Administrator account. Start a simple java process and logoff. But the process is not killed. Is there any configuration for this or something? I am mostly a software programmer and not much in to servers and so I am stuck. I found out that while logging off, 1) Win32 is supposed to send a CTRL_LOGOFF_EVENT to all processes started by that user. 2) JVM is supposed to handle this event and terminate the VM. But I can't understand why my java process is not killed when i logoff. Any idea!!!

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• Nginx (for static files) and Apache (for dynamic content)?

  - by matthewsteiner

  So, my entire application runs on apache just fine. However, I want to test how much the requests per second increases if I put all static files through nginx instead. I found this thread: http://stackoverflow.com/questions/869001/how-to-serve-all-existing-static-files-directly-with-nginx-but-proxy-to-apache-t But I have a couple problems. I'm completely new to nginx, so I'm not sure where to put the configuration. (The file is at /etc/nginx/nginx.conf, but I don't know if I just add the code to the bottom or what?) Also, how can I have both servers running at the same time? Is it because they both listen on port 80? Right now I have to stop one to start the other, and that's as far as I've gotten. Thanks for any help.

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• How to setup VM in KVM? Qcow or LVM etc.

  - by JohnAdams

  Finally, after quite a bit of this vs that, I have chosen to virtualize a couple of my servers with KVM. I did do a test setup as well, but I have a few questions about setting VM's in KVM. Would appreciate pointers. What is the best storage to use - Qcow2 or LVM? I like the fact that I can copy the VM file easily with a Qcow2 but what about LVM, how do I take a backup or make copy on a development server to play with? I know I can clone a LVM, but how do I bring to my development server? How do I setup the guest partitioning? For example, when setting up Ubuntu inside Ubuntu, do I choose LVM for that VM or regular fdisk partitioning? Can I increase the partition size then later, if I need a bigger disk?

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• Systemd-networkd: How can I prepend a static nameserver entry to DHCP-discovered nameservers?

  - by runiq

  I'm using systemd 213 on Arch Linux, and systemd-networkd with DHCP to connect to the internet. I'm also running a caching DNS server on 127.0.0.1. I'd like to make this server the first DNS server in the list, but I'd also like to use the nameservers discovered by systemd-networkd's DHCP facility. Using a static resolv.conf isn't really possible, because I connect to networks with different DNS settings. I know I can set fallback DNS servers in /etc/systemd/resolved.conf, but is there a way with systemd-networkd to prepend my local DNS server to those discovered by DHCP?

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• mysql cluster virtual ip

  - by user225995

  I am new in mysql cluster and mysql cluster and versions are not my choice. I setup four machines. Two of them manager , Two of them data cluster (ndb and mysqld). And i integrate with mysql utilities master/slave configuration. Everything working fine. Mysql version 5.6.17, ndb 7.3.5 , servers ubuntu 14.04. There will be no much transactions. The only important thing is HA. Everythings must be double. My problem is virtual ip. Since I have only one farm which have master slave configuration, how can i do it without proxy? If I must use proxy which proxy is better?

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• Fresh Apache install can't be connected to

  - by Wayne M

  I've got to be missing something here. I have a brand new CentOS server with a LAMP install on it. My domain host (GoDaddy) has the server's IP address configured as the "A Record". Since the server will host subdomains I have enabled NameVirtualHost and set up a virtual host pointing to the web app on the server. I haven't touched anything else in Apache, and it's listening on Port 80 like it should be. However, I can't connect to the server either by DNS or by IP address. I've set up several servers exactly like this one and never run into this before. What could be causing this? Did someone on the host set up a firewall or something that blocks port 80? As I said, I can't connect to the server via anything, but it's a barebones box with LAMP installed on it.

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• Recurring network issues the same time every day.

  - by Peter Turner

  Something has been happening on my company's network at 9:30 every day. I'm not the sysadmin but he's not a ServerFault guy so I'm not privy to every aspect of the network but I can ask questions if follow up is needed. The symptoms are the following : Sluggish network and download speed (I don't notice it, but others do) 3Com phones start ringing without having people on the other end. We've got the following ports exposed to the public for a web server, a few other ports for communicating with our clients for tech support and a VPN. We've got a Cisco ASA blocking everything else. We've got a smallish network (less than 50 computers/vms on at any time). An Active Directory server and a few VM servers. We host our own mail server too. I'm thinking the problem is internal, but what's a good way to figure out where it's coming from?

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• How to configure Linux to act as a Bluetooth RFCOMM SPP server?

  - by regulatre

  I'm writing a phone app for Android that connects to a bluetooth RFCOMM device in my car. My phone app talks AT commands with it. For development work, I often need to communicate with the device to try different commands and things. My neighbors are starting to think I'm weird because I sit in my car for hours on end with my laptop screen shining on my face, typing away like a script kiddie. I'd much rather configure one of my many Linux servers to act as a bluetooth RFCOMM device and allow me to connect to it (indoors, while I sit on my couch). I imagine I have to start with something like sdptool add SP But then what? I'm perfectly happy writing a perl app to handle the I/O, but I just don't know how to make the bluez stack accept connections and subsequently pipe that stream to a perl app.

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• How long does it take for a server to get 'off greylisting'

  - by Michael

  Hi all, I asked a question regarding email delays a few months ago, and I think I found a workaround. I changed our email from "[email protected]" to "[email protected]", and it seems to work instantly again. After reading some articles, I believe this could be due to some form of greylisting, though some servers might call it something else -- if a server like yahoo or gmail receive email from a server that it is not used to receiving email from, then sometimes the delay occurs. But a name such as yahoo, gmail, which requires a user to sign up manually -- this delay can be avoided. My question is this: does anyone know more about this issue -- especially since it would be nice to send an email from our own site, instead of needing to use a whitelisted server? Thanks!

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• What can impact the throughput rate at tcp or Os level?

  - by Jimm

  I am facing a problem, where running the same application on different servers, yields unexpected performance results. For example, running the application on a particular faster server (faster cpu, more memory), with no load, yields slower performance than running on a less powerful server on the same network. I am suspecting that either OS or TCP is causing the slowness on the faster server. I cannot use IPerf , unless i modify it, because the "performance" in my application is defined as Component A sends a message to Component B. Component B sends an ACK to component A and ONLY then Component A would send the next message. So it is different from what IPerf does, which to my knowledge, simply tries to push as many messages as possible. Is there a tool that can look at OS and TCP configuration and suggest the cause of slowness?

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• windows 2003 - why can't serial port be accessed remotely?

  - by Danny Staple

  we have recently installed the updates on some of our servers, which have a bit of hardware attached via USB that presents itself as a serial (COM) port. The strange behaviour is that if I start a cmd shell on the server via VNC, I can open the serial port. If I run a service and start it from there (telnet, jenkins) then I receive a "not found" error for it. IE: C:\Documents and Settings\some_user>echo 1 >COM4: C:\Documents and Settings\some_user> on the local cmd will work, and on the remote telnet will give: C:\Documents and Settings\some_user>echo 1 >COM4: The system cannot find the file specified. C:\Documents and Settings\some_user> I cannot see any security settings on the Device manager settings panel for this device.

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