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• ??! ??! Oracle/DB??????~2011?1??????????(???)

  - by Yusuke.Yamamoto

  2011?1???????????(???)?????????????????? ????????RAC/ASM?????????????????? ??????????????????????????? Oracle GoldenGate ???/????????????? ???????????????! ??! Oracle????????????????????????????????????????? ???! ??! Oracle????????????????????? ???! ??! Oracle????????? ????????????Oracle Database 11gR2 ??????????????? Oracle Database 11gR2(11.2.0.2) ???????????????? ????????????????????????? Oracle Database 11gR2(11.2.0.2)????????????:???PSR???????? ?? ???? ???? ??? ??????(RAC) ?????????Oracle Database 11gR2 RAC ?????????·??? ASM ? Microsoft Windows x86-64 ??? ?????? ??????????????!? Oracle Database 11g Release2 - Windows? ??????????? ??? ?????? ??????Oracle Database 11gR2 Oracle Grid Infrastructure ?????? ??? ???? ???????????????!? ?????????? ??? ??????? ??????Oracle Database 11gR2 ???????????????? ??? ??????? ???????/??????????!? Export/Import??? ??? ??????? ???????/?????!! ???????·?????? ~Statspack??~ ??? ????? ????????Oracle GoldenGate:?????!! DB??/Upgrade????????? New! ??? ??????? ???????/??????????!? ???????·???????? ??? ??????? ???????????! ??! Oracle????????? ?????? New!

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• yum not working on EC2 Red Hat instance: Cannot retrieve repository metadata

  - by adev3

  For some reason yum has stopped working in my Amazon EC2 instance, located in the EU West sector. There seems to be something wrong with the path of the repo metadata, is this correct? I would be very grateful for any help, as my experience in this field is somewhat limited. Thank you very much. cat /etc/redhat-release: Red Hat Enterprise Linux Server release 6.2 (Santiago) yum repolist: Loaded plugins: amazon-id, rhui-lb, security https://rhui2-cds01.eu-west-1.aws.ce.redhat.com/pulp/repos//rhui-client-config/rhel/server/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 401" Trying other mirror. https://rhui2-cds02.eu-west-1.aws.ce.redhat.com/pulp/repos//rhui-client-config/rhel/server/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 401" Trying other mirror. repo id repo name status rhui-eu-west-1-client-config-server-6 Red Hat Update Infrastructure 2.0 Client Configuration Server 6 0 rhui-eu-west-1-rhel-server-releases Red Hat Enterprise Linux Server 6 (RPMs) 0 rhui-eu-west-1-rhel-server-releases-optional Red Hat Enterprise Linux Server 6 Optional (RPMs) 0 repolist: 0 yum update: (I needed to remove the base URLs below because of ServerFault's restrictions for new users) Loaded plugins: amazon-id, rhui-lb, security [same as base url 1 above]/pulp/repos//rhui-client-config/rhel/server/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 401" Trying other mirror. [same as base url 2 above]/pulp/repos//rhui-client-config/rhel/server/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 401" Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: rhui-eu-west-1-client-config-server-6. Please verify its path and try again

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• Unable to Install SQL Server on Server 2012

  - by Jeff

  The problem I have been trying to install SQL Server 2012 on Windows Server 2012. I continually get the same error: Managed SQL Server Installer has stopped working Problem signature: Problem Event Name: CLR20r3 Problem Signature 01: scenarioengine.exe Problem Signature 02: 11.0.3000.0 Problem Signature 03: 5081b97a Problem Signature 04: Microsoft.SqlServer.Chainer.Setup Problem Signature 05: 11.0.3000.0 Problem Signature 06: 5081b97a Problem Signature 07: 18 Problem Signature 08: 0 Problem Signature 09: System.IO.FileLoadException OS Version: 6.2.9200.2.0.0.272.79 Locale ID: 1033 Additional Information 1: c319 Additional Information 2: c3196e5863e32e0baf269d62f56cbc70 Additional Information 3: 422d Additional Information 4: 422d950c58f4efd1ef1d8394fee5d263 What I've tried After initial googling, I've tried the following things: Go through the list of hardware and software pre-reqs. All the software seems to be there by default on Server 2012 and my hardware meets the reqs. Copy the installation media to the local drive and try to install from that (rather than a DVD). This produced the same error. Based on another error message, I installed .NET 4.0 (which apparently is not on Server 2012 out of the box). Same error. Install from command line. This didn't work either, but it gave me a different error: Error: Unhandled Exception: System.IO.FileLoadException: Could not load file or assembl y 'Microsoft.SqlServer.Configuration.Sco, Version=11.0.0.0, Culture=neutral, Pub licKeyToken=89845dcd8080cc91' or one of its dependencies. Strong name validation failed. (Exception from HRESULT: 0x8013141A) ---> System.Security.SecurityExcep tion: Strong name validation failed. (Exception from HRESULT: 0x8013141A) --- End of inner exception stack trace --- at Microsoft.SqlServer.Chainer.Infrastructure.InputSettingService.CheckForBoo leanInputSettingExistenceFromCommandLine(ServiceContainer context, String settin gName) at Microsoft.SqlServer.Chainer.Setup.Setup.DebugBreak(ServiceContainer contex t) at Microsoft.SqlServer.Chainer.Setup.Setup.Main() Any ideas what I am missing?

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• Cisco ASA and SixXS IPv6 tunnel endpoint?

  - by Martijn Heemels

  I recently installed a Cisco ASA 5505 firewall on the edge of our LAN. The setup is simple: Internet <-- ASA <-- LAN I would like provide the hosts in the LAN with IPv6 connectivity by setting up a 6in4 tunnel to SixXS. It would be nice to have the ASA as tunnel endpoint so it can firewall both IPv4 and IPv6 traffic. Unfortunately the ASA apparently can't create a tunnel itself, and can't port-forward protocol 41 traffic, so I believe I would have to do one of the following instead: Set up a host with it's own IP outside the firewall, and have that function as tunnel-endpoint. The ASA can then firewall and route the v6 subnet to the LAN. Set up a host inside the firewall that functions as endpoint, separated via vlan or whatever, and loop the traffic back into the ASA where it can be firewalled and routed. This seems contrived, but would allow me to use a VM instead of a physical machine as endpoint. Any other way? What would you suggest is the optimal way to set this up? P.S. I do have a spare public IP address available if needed, and can spin up another VM in our VMware infrastructure.

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• Bad disk performance on HP DL360 with Smarty Array P400i RAID controller

  - by sarge

  I have a HP DL360 server with 4x 146GB SAS disks and a Smart Array P400i RAID controller with 256MB cache. The disks are in RAID 5 (3 disks + 1 hot spare). The server is running VMware ESX 3i. The disk write performance is really bad. Here are some numbers: ns1:~# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 3364 MB in 2.00 seconds = 1685.69 MB/sec Timing buffered disk reads: 18 MB in 3.79 seconds = 4.75 MB/sec ns1:~# time sh -c "dd if=/dev/zero of=ddfile bs=8k count=125000 && sync" 125000+0 records in 125000+0 records out 1024000000 bytes (1.0 GB) copied, 282.307 s, 3.6 MB/s real 4m52.003s user 0m2.160s sys 3m10.796s Compared to another server those number are terrible: Dell R200, 2x 500GB SATA disks, PERC raid controller (disks are mirrored). web4:~# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 6584 MB in 2.00 seconds = 3297.79 MB/sec Timing buffered disk reads: 316 MB in 3.02 seconds = 104.79 MB/sec web4:~# time sh -c "dd if=/dev/zero of=ddfile bs=8k count=125000 && sync" 125000+0 records in 125000+0 records out 1024000000 bytes (1.0 GB) copied, 35.2919 s, 29.0 MB/s real 0m36.570s user 0m0.476s sys 0m32.298s The server isn't very loaded and the VMware Infrastructure Client performance monitor is showing 550KBps average read and 1208KBps average write for the last 30 minutes (highest write rate: 6.6MBps). This has been a problem from the start. Any ideas?

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• Avoiding DNS timeouts when a dns server fails

  - by user65124

  Hi there. We have a small datacenter with about a hundred hosts pointing to 3 internal dns servers (bind 9). Our problem comes when one of the internal dns servers becomes unavailable. At that point all the clients that point to that server start performing very slowly. The problem seems to be that the stock linux resolver doesn't really have the concept of "failing over" to a different dns server. You can adjust the timeout and number of retries it uses, (and set rotate so it will work through the list), but no matter what settings one uses our services perform much more slowly if a primary dns server becomes unavailable. At the moment this is one of the largest sources of service disruptions for us. My ideal answer would be something like "RTFM: tweak /etc/resolv.conf like this...", but if that's an option I haven't seen it. I was wondering how other folks handled this issue? I can see 3 possible types of solutions: Use linux-ha/Pacemaker and failover ips (so the dns IP VIPs are "always" available). Alas, we don't have a good fencing infrastructure, and without fencing pacemaker doesn't work very well (in my experience Pacemaker lowers availability without fencing). Run a local dns server on each node, and have resolv.conf point to localhost. This would work, but it would give us a lot more services to monitor and manage. Run a local cache on each node. Folks seem to consider nscd "broken", but dnrd seems to have the right feature set: it marks dns servers as up or down, and won't use 'down' dns servers. Any-casting seems to work only at the ip routing level, and depends on route updates for server failure. Multi-casting seemed like it would be a perfect answer, but bind does not support broadcasting or multi-casting, and the docs I could find seem to suggest that multicast dns is more aimed at service discovery and auto-configuration rather than regular dns resolving. Am I missing an obvious solution?

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• Nginx case-insensitive reverse proxy rewrites

  - by BrianM

  I'm looking to setup an nginx reverse proxy to make some upcoming server moves and load balanced implementations much easier within our apps. Since our servers are all IIS case sensitivity hasn't been an issue, but now with nginx it's becoming one for me. I am simply looking to do a rewrite regardless of case. Infrastructure notes: All backend servers are IIS Most services are WCF services I am trying to simplify the URLs so I can move services around as we continue to build out I can't set my location to case insensitive due to the following error: nginx: [emerg] "proxy_pass" cannot have URI part in location given by regular expression, or inside named location, or inside "if" statement, or inside "limit_except" block in /etc/nginx/sites-enabled/test.conf:101 The main part of my conf file where I am trying to handle the rewrite is as follows location /svc_test { proxy_set_header x-real-ip $remote_addr; proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for; proxy_set_header host $http_host; proxy_pass http://backend/serviceSite/WFCService.svc; } location ~* /test { rewrite ^/(.*)/$ /svc_test/$1 last; } It's the /test location that I can't get figured out. If I call http://nginxserver/svc_test/help I get the WCF help page to display correctly and I can make all available REST calls. This HAS to be a boneheaded regex issue on my part, but I have tried several variations and all I can get are 404 or 500 errors from nginx. This is NOT rocket science so can someone point me in the right direction so I can look like an idiot and just move on?

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• Commercial SIP Trunking in mainland China [closed]

  - by Patrick

  Is there any regulation preventing the use/sale of SIP trunks in mainland China? I've set up and used commercial-grade SIP trunks in places where previously we would have used ISDN T1/E1 connections. Here in Shanghai I'm looking for a similar service, and while E1 30B+D services are readily available, every telecoms company we speak with says that SIP trunking is not available in China with re-sellers of both China Telecom and China Unicom. But no one seems to know why. It seems logical to me that SIP trunks are cheaper to operate than ISDN services given that the first mile transit can be run over already-existing Internet infrastructure, and SIP signaling reduces the amount of configuration required by subscribers which is why it appeals to me. As such I've come to expect SIP services to be available in modern markets, and I've used them in quite a few countries. For example, one place I know it's not possible is in India. Government regulations in India make it illegal to provide PSTN service using VoIP. (Citations: 1, 2). However it seems this may be changing. Perhaps China has something similar.

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• Troubleshooting transient Windows I/O "The parameter is incorrect." errors

  - by Kevin

  We have a set of .Net 2.0 applications running on Windows 2003 servers which have started experiencing transient "The parameter is incorrect." Windows I/O errors. These errors always happen accessing a file share on a SAN. The fact that this error has happened with multiple applications and multiple servers leads me to believe that this is an infrastructure issue of some sort. The applications all run under the same domain account. When the errors occur they generally will resolve themselves within a few minutes. I can log in to the application server once the error starts occurring and access the file share myself with no problems. I have looked at the Windows event logs and haven't found anything useful. Due to the generic nature of "The parameter is incorrect.", I am looking for additional troubleshooting suggestions for this error. A sample stack trace is below. Note that while this example was during a directory creation operation, when the problem is occurring, this exception is thrown for any file system operations on the share. Exception 1: System.IO.IOException Message: The parameter is incorrect. Method: Void WinIOError(Int32, System.String) Source: mscorlib Stack Trace: at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.Directory.InternalCreateDirectory(String fullPath, String path, DirectorySecurity dirSecurity) at System.IO.Directory.CreateDirectory(String path, DirectorySecurity directorySecurity) at System.IO.Directory.CreateDirectory(String path)

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• Troubleshooting transient Windows I/O "The parameter is incorrect." errors

  - by Kevin

  We have a set of .Net 2.0 applications running on Windows 2003 servers which have started experiencing transient "The parameter is incorrect." Windows I/O errors. These errors always happen accessing a file share on a SAN. The fact that this error has happened with multiple applications and multiple servers leads me to believe that this is an infrastructure issue of some sort. The applications all run under the same domain account. When the errors occur they generally will resolve themselves within a few minutes. I can log in to the application server once the error starts occurring and access the file share myself with no problems. I have looked at the Windows event logs and haven't found anything useful. Due to the generic nature of "The parameter is incorrect.", I am looking for additional troubleshooting suggestions for this error. A sample stack trace is below. Note that while this example was during a directory creation operation, when the problem is occurring, this exception is thrown for any file system operations on the share. Exception 1: System.IO.IOException Message: The parameter is incorrect. Method: Void WinIOError(Int32, System.String) Source: mscorlib Stack Trace: at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.Directory.InternalCreateDirectory(String fullPath, String path, DirectorySecurity dirSecurity) at System.IO.Directory.CreateDirectory(String path, DirectorySecurity directorySecurity) at System.IO.Directory.CreateDirectory(String path)

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• Windows Authentication behaves oddly when VPN'd

  - by Dan F

  Hi all We've got a few apps that rely on windows authentication - a couple of web apps with AD auth turned on and we usually connect to our SQL servers with windows auth. This normally runs without a hitch. It doesn't work so well if we're VPN'd to a client site though. SSMS Opening SSMS normally from the start menu, then picking a server that normally accepts windows auth, results in a message saying: Login failed. The login is from an untrusted domain and cannot be used with Windows authentication. (.Net SqlClient Data Provider) If I drop to a command prompt and use runas /user:domain\user to launch SSMS I can successfully windows auth to our SQL server instances with that ssms process. If I look in task manager, both copies of ssms.exe (start menu vs runas) have the same user, and I can see no discernible differences between the processes in procexp. AD Auth websites If I open IE and browse to any of our websites that require an authenticated windows user, I get the "who are you" prompt, and that dialog thinks I'm whoever the VPN user is. I can click "Use another account" and authenticate that way though. Outlook Even Outlook prompts for a username when we are VPN'd! It's affecting our Win7 and Vista machines. It's been a while since we had an XP box, but I don't recall having this issue on XP for what it's worth. The VPN connections are just using the built in windows VPN connections, they're not fancy cisco VPNs or anything of that nature. Does anyone know how to tell windows that I'd like to be my normal old primary domain user rather than the VPN user when authenticating to resources in our domain? Heck, I'd be happy with a solution that prompted me with the "who are you" if I was trying to access windows auth requiring resources on the client's VPN. Thanks! Apologies if this is more a superuser question, I wasn't sure which site it best suited. It's about networking and infrastructure and plagues all of our developers here, so I hope it's a serverfault Q.

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• yum install php-devel amongst other commands returning problems

  - by user3791722

  I run yum install php-devel and it returns this. Typically I'd just run it with --skip-broken, but when I do, it still doesn't do the trick. Available: php-common-5.3.3-22.el6.x86_64 (rhel-x86_64-server-6) php-common(x86-64) = 5.3.3-22.el6 Available: php-common-5.3.3-23.el6_4.x86_64 (rhel-x86_64-server-6) php-common(x86-64) = 5.3.3-23.el6_4 Available: php-common-5.3.3-26.el6.x86_64 (rhel-x86_64-server-6) php-common(x86-64) = 5.3.3-26.el6 Available: php54w-common-5.4.29-2.w6.x86_64 (webtatic) php-common(x86-64) = 5.4.29-2.w6 Available: php54w-common-5.4.30-1.w6.x86_64 (webtatic) php-common(x86-64) = 5.4.30-1.w6 Available: php55w-common-5.5.13-2.w6.x86_64 (webtatic) php-common(x86-64) = 5.5.13-2.w6 Installing: php55w-common-5.5.14-1.w6.x86_64 (webtatic) php-common(x86-64) = 5.5.14-1.w6 You could try using --skip-broken to work around the problem When run with --skip-broken it returns this at the end: Packages skipped because of dependency problems: autoconf-2.63-5.1.el6.noarch from rhel-x86_64-server-6 automake-1.11.1-4.el6.noarch from rhel-x86_64-server-6 pcre-devel-7.8-6.el6.x86_64 from rhel-x86_64-server-6 php-5.3.3-27.el6_5.1.x86_64 from rhel-x86_64-server-6 php-cli-5.3.3-27.el6_5.1.x86_64 from rhel-x86_64-server-6 php-common-5.3.3-27.el6_5.1.x86_64 from rhel-x86_64-server-6 php-mysql-5.3.3-27.el6_5.1.x86_64 from rhel-x86_64-server-6 php-pdo-5.3.3-27.el6_5.1.x86_64 from rhel-x86_64-server-6 php-soap-5.3.3-27.el6_5.1.x86_64 from rhel-x86_64-server-6 php55w-cli-5.5.14-1.w6.x86_64 from webtatic php55w-common-5.5.14-1.w6.x86_64 from webtatic php55w-devel-5.5.14-1.w6.x86_64 from webtatic This problem has arisen with a few other similar commands when installing something related to php, except I've just done without them. I need to install this for something I'm trying to do. I do remember upgrading to PHP 5.4 and our entire infrastructure coming down due to it requiring PHP 5.3, so I downgraded as quick as possible to get everything back running and that may contribute to the issue. If you have any idea why this is happening and how I could get the package on the system while remaining on PHP 5.3, please let me know. Thanks.

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• SQL Server slow in production environment

  - by Lieven Cardoen

  I have a weird problem in a customer's production environment. I can't give any details on the infrastructure, except that SQL server runs on a virtual server. The data, log and filestream file are on another storage server (data and filestream together and log on a separate server). In our local Test environment, there's one particular query that executes with these durations: first we clear the cache 300ms (First time it takes longer, but from then on it's cached.) 20ms 15ms 17ms In the customer's production environment, the SQL Server is more powerful, these are the durations (I didn't have the rights to clear the cache. Will try this tomorrow). 2500ms 2600ms 2400ms The servers in the customer's production environment are more powerful but they do have virtual servers (we don't). What could be the cause... Not enough memory? Fragmentation? Physical storage? How would you tackle this performance problem? EDIT: Some people have asked me if the data set is equal and it is. I restored their database on our environment. It's true that this was the first thing I looked at. (@Everyone: I added the edit because it will be the first thing that many will think off).

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• Managing Many External Hosts Using EC2 and Route 53

  - by futureal

  Looking for a "best practice" answer to managing externally-addressable hosts using the combination of Amazon EC2 and Amazon Route 53, without using Elastic IPs for each host. In my scenario I will have 30+ hosts that need to be accessible from outside EC2, so directly using internal DNS will not work. In the past, I have addressed hosts by assigning an elastic IP to that host (let's say, 55.55.55.55) and then creating an associated A record. For example, let's say I want to create "ec2-corp01.mydomain.com" I might do: ec2-corp01.mydomain.com. A 55.55.55.55 300 Then on that EC2 instance, I would assign the Elastic IP of 55.55.55.55, and everything works fine. Of course, to make this work, I need to have one Elastic IP per instance, which is something I'd like to avoid if possible; I'd like the infrastructure to be more dynamic. So my thought is to try something like: Create a script that queries the internal EC2 tools to determine an instance's private hostname On instance boot, call that script to determine its hostname, and then using the command-line Route 53 interface to find and update that hostname to its current internal hostname Since the host will have a relatively low TTL (let's say 300 as above, or 5 minutes) it should take effect pretty quickly Is this a good idea? Is there a better or more widely accepted way to handle it? If it IS a good idea, what type of record should I be creating? A CNAME that points to the internal host, like ec2-55-55-55-55.compute-1.amazonaws.com? Is an A record better or worse? Thanks!

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• Recommendations for secure business collaboration tools

  - by Michael Prescott

  I'm searching for a secure and easy way for business partners to collaboratively edit and exchange documents, share calendars, create schedules, and assign tasks. I speculate that the ideal collaboration environment or work-flow would actually involve several technologies and services. My co-workers and I have tried a variety of things from Google Apps to Wiki's, but nothing feels very fluid or complete. I suppose defining what we need and our constraints is probably in order: collaboratively edit basic text documents and spreadsheets exchange documents like flow-charts, graphs, and files generated by our other desktop applications, but not source code assign tasks to each other and ourselves and track the history of those tasks easily see when relevant documents have been modified since last viewing and ability to easily push notifications to relevant workers (a clean front page that shows updates would probably suffice) provide limited access to contract workers and guests users if a remote user system is compromised (keystroke logger or other spyware) we don't want the criminal to be able to gain access to all business documents (processes, trade-secrets, customer lists, etc.) simply because they gained access to a single Google account (or whatever web service) Cannot be a difficult to administer VPN infrastructure Cannot cost more than $100 per month (yeah, money is tight) Needs to support up to 25 users We can host our own web applications, but it must be low maintenance solution

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• Cisco ASA and static IPv6 tunnel endpoint?

  - by Martijn Heemels

  I recently installed a Cisco ASA 5505 firewall on the edge of our LAN. The setup is simple: Internet <-- ASA <-- LAN I would like provide the hosts in the LAN with IPv6 connectivity by setting up a 6in4 tunnel to SixXS. It would be nice to have the ASA as tunnel endpoint so it can firewall both IPv4 and IPv6 traffic. Unfortunately the ASA apparently can't create a tunnel itself, and can't port-forward protocol 41 traffic, so I believe I would have to do one of the following instead: Set up a host with it's own IP outside the firewall, and have that function as tunnel-endpoint. The ASA can then firewall and route the v6 subnet to the LAN. Set up a host inside the firewall that functions as endpoint, separated via vlan or whatever, and loop the traffic back into the ASA where it can be firewalled and routed. This seems contrived, but would allow me to use a VM instead of a physical machine as endpoint. Any other way? What would you suggest is the optimal way to set this up? P.S. I do have a spare public IP address available if needed, and can spin up another VM in our VMware infrastructure.

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• Recommended programming language for linux server management and web ui integration

  - by Brendan Martens

  I am interested in making an in house web ui to ease some of the management tasks I face with administrating many servers; think Canonical's Landscape. This means doing things like, applying package updates simultaneously across servers, perhaps installing a custom .deb (I use ubuntu/debian.) Reviewing server logs, executing custom scripts, viewing status information for all my servers. I hope to be able to reuse existing command line tools instead of rewriting the exact same operations in a different language myself. I really want to develop something that allows me to continue managing on the ssh level but offers the power of a web interface for easily applying the same infrastructure wide changes. They should not be mutually exclusive. What are some recommended programming languages to use for doing this kind of development and tying it into a web ui? Why do you recommend the language(s) you do? I am not an experienced programmer, but view this as an opportunity to scratch some of my own itches as well as become a better programmer. I do not care specifically if one language is harder than another, but am more interested in picking the best tools for the job from the beginning. Feel free to recommend any existing projects that already integrate management of many systems into a single cohesive web ui, except Landscape (not free,) Ebox (ebox control center not free) and webmin (I don't like it, feels clunky and does not integrate well with the "debian way" of maintaining a server, imo. Also, only manages one system.) Thanks for any ideas! Update: I am not looking to reinvent the wheel of systems management, I just want to "glue" many preexisting and excellent tools together where possible and appropriate; this is why I wonder about what languages can interact well with pre-existing command line tools, while making them manageable with a web ui.

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• Serving images from another hostname vs Apache overload for the rewrites

  - by luison

  We are trying to improve further the speed of some sites with older HTML in order as well to obtain better SEO results. We have now applied some minify measures, combined html, css etc. We use a small virtualized infrastructure and we've always wanted to use a light + standar http server configuration so the first one can serve images and static contents vs the other one php, rewrites, etc. We can easily do that now with a VM using the same files and conf of vhosts (bind mounts) on apache but with hardly any modules loaded. This means the light httpd will have smaller fingerprint that would allow us to serve more and quicker, have more minSpareServer running, etc. So, as browsers benefit from loading static content from different hostnames as well, we've thought about building a rewrite rule on our main server (main.com) to "redirect" all images and css *.jpg, *.gif, *.css etc to the same at say cdn.main.com thus the browser being able to have more connections. The question is, assuming we have a very complex rewrite ruleset already (we manually manipulate many old URLs for SEO) will it be worth? I mean will the additional load of main's apache to have to redirect main.com/image.jpg (I understand we'll have to do a 301) to cdn.main.com/image.jpg + then cdn.main.com having to serve it, be larger than the gain we would be archiving on the browser? Could the excess of 301s of all images on a page be penalized by google? How do large companies work this out, does the original code already include images linked from the cdn with absolute paths? EDIT Just to clarify, our concern is not to do so much with server performance or bandwith. We could obviously employ an external CDN server but we have plenty CPU and bandwith. Our concern is with how to have "old" sites with plenty semi-static HTML content benefiting from splitting connections for images and static content via apache without having to change the html to absolute paths (ie. image.jpg to cdn.main.com/image.jpg happening on the server not the code)

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• Nokia 5800 v50, getting "Invalid server name" with ad-hoc wlan with Windows 7

  - by Krunal

  After upgrading to v50 firmware in my Nokia 5800 xpress music phone. I am not able to connect to ad-hoc wlan network in my laptop(Windows 7 OS). I have a dialup internet connection and created wireless ad-hoc network to access the internet in my phone. But I am getting "invalid server name" in the phone and my wireless network access type in Windows 7 shows "no internet access". I am able to connect to wlan infrastructure network using 5800 in my office. So my phone is working with wlan and I m able to access internet on it. BUT The problem is "dial up with ICS enabled" and "AD-HOC wlan network" in Windows 7. Can anyone give some solution on it. Or can you provide a guide/tutorial to connect 5800 with adhoc network and dialup internet in Windows 7. System: Windows 7 Dial up internet connection with ICS enabled. Ad-Hoc wireless network with WEP Nokia 5800 Xpress Music phone Note: I have read other posts also and tried their solutions but didn't worked for me. the first solution is to bridge the network and access it. but how can I bridge the dialup and wlan netwok? second solution is manually configure IP and DNS addresses in phone. But what should I add as IP and DNS as my dial up and adhoc network have automatic addresses.

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• GRE Tunnel over IPsec with Loopback

  - by Alek

  I'm having a really hard time trying to estabilish a VPN connection using a GRE over IPsec tunnel. The problem is that it involves some sort of "loopback" connection which I don't understand -- let alone be able to configure --, and the only help I could find is related to configuring Cisco routers. My network is composed of a router and a single host running Debian Linux. My task is to create a GRE tunnel over an IPsec infrastructure, which is particularly intended to route multicast traffic between my network, which I am allowed to configure, and a remote network, for which I only bear a form containing some setup information (IP addresses and phase information for IPsec). For now it suffices to estabilish a communication between this single host and the remote network, but in the future it will be desirable for the traffic to be routed to other machines on my network. As I said this GRE tunnel involves a "loopback" connection which I have no idea of how to configure. From my previous understanding, a loopback connection is simply a local pseudo-device used mostly for testing purposes, but in this context it might be something more specific that I do not have the knowledge of. I have managed to properly estabilish the IPsec communication using racoon and ipsec-tools, and I believe I'm familiar with the creation of tunnels and addition of addresses to interfaces using ip, so the focus is on the GRE step. The worst part is that the remote peers do not respond to ping requests and the debugging of the general setup is very difficult due to the encrypted nature of the traffic. There are two pairs of IP addresses involved: one pair for the GRE tunnel peer-to-peer connection and one pair for the "loopback" part. There is also an IP range involved, which is supposed to be the final IP addresses for the hosts inside the VPN. My question is: how (or if) can this setup be done? Do I need some special software or another daemon, or does the Linux kernel handle every aspect of the GRE/IPsec tunneling? Please inform me if any extra information could be useful. Any help is greatly appreciated.

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• AD server within another network - DNS issues

  - by Harry Muscle

  Here's a quick summary of the environment I support: we have a domain (domain A) that has about 20 client computers. The domain server for this domain and all the clients sit within the network infrastructure of a larger domain (domain B). All the computers get their network settings via DHCP from domain B's servers. I have no control and am unable to make changes to anything to do with domain B. The problem I have is that currently in order for my domain's (domain A) clients to be able to resolve the domain server and the shares on it they have their DNS server IP address set to domain A's domain server (via the default GPO). Unfortunately when a laptop (windows and mac) gets taken home, they are still looking for the domain server as their DNS server and obviously can't access the internet correctly outside of our environment. Ideally I need a solution where the machines use domain A's domain server as their DNS when inside the office and use what ever DNS server DHCP gives them when they are outside the office. However, since I have no control over the office DHCP server, I'm not sure how this can be accomplished. Any help and advice that anyone can offer is highly appreciated. Thanks, Harry P.S. The solution I'm trying to find needs to require no involvement from the user.

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• How can a Linux Administrator improve their shell scripting and automation skills?

  - by ewwhite

  In my organization, I work with a group of NOC staff, budding junior engineers and a handful of senior engineers; all with a focus on Linux. One interesting step in the way the company grows talent is that there's a path from the NOC to the senior engineering ranks. Viewing the talent pool as a relative newcomer, I see that there's a split in the skill sets that tends to grow over time... There are engineers who know one or several particular technologies well and are constantly immersed... e.g. MySQL, firewalls, SAN storage, load balancers... There are others who are generalists and can navigate multiple technologies. All learn enough Linux (commands, processes) to do what they need and use on a daily basis. A differentiating factor between some of the staff is how well they embrace scripting, automation and configuration management methodologies. For instance, we have two engineers who do the bulk of Amazon AWS CloudFormation work, and another who handles most of the Puppet infrastructure. Perhaps a quarter of the engineers are adept at BASH shell scripting. Looking at this in the context of the incredibly high demand for DevOps skills in the job market, I'm curious how other organizations foster the development of these skills and grow their internal talent. Scripting doesn't seem like a particularly-teachable concept. How does a sysadmin improve their shell scripting? Is there still a place for engineers who do not/cannot keep up in the DevOps paradigm? Are we simply to assume that some people will be left behind as these technologies evolve? Is that okay?

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• Remote desktop solution where the desktop sharing party contacts the computer it wants to share with

  - by Kent

  I'm in a situation where I act as a sort of techinical support to my family and less techinically experienced friends. I'm looking for a remote desktop solution where it's possible to setup a "zero-install, double click an icon"-solution where the client computer contacts me so that I may interact with their desktop. The last part is important as the people in need of my help don't know how to configure their router or even the firewall software on their own computer. They are able to click an accept button when asked if a program should be able to make outgoing connections. They have many different kinds of routers, as well as software firewalls, and I rather not deal with the problem of how to connect to them using whatever as well as the actual problem they are having. It must be: Free of charge for non-commercial use. Possible to use it in a mode where the computer wanting to share its desktop should be able to make a connection to my computer. My computer has a DNS name we can use. Compatible with both Windows XP and Windows 7. Independent of a third party server or infrastructure. Explanations of the above: I don't want to spend money on it when I help them for free. If it's free as in freedom, all the better! I guess this boils down to being callable like showdesktopto.exe opscomputer.com where opscomputer.com is my computers DNS name. If that is possible then I can create a shortcut they can use to connect to me when they need help. It's nice if it's possible to specify a password or key file which I can use to authenticate myself, but it's not required. They use the OS which their machine comes installed with. That means Windows XP or 7. I want something which will work in the long run. Using a third party service which might not be available when I need it disqualified such solutions.

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• New virtualization project and old SAN

  - by Chris

  Hi, We'll start shortly a partial virtualization of our infrastructure and consolidate a dozen servers into virtuals instances. We'll also add some client application virtualization into the mix for good measure. Two HP DL 380 with the new xeons 56xx and 96 GB of memory each running xenserver + xenapp will then take charge of most of our IT needs. So far, so good. One element that is missing from the picture is the storage part. We need some sort of shared storage to enable live motion and other HA features. We have an IBM DS 4300 SAN that we can use for that. But since it's in production since 2005, I'm not sure about such a critical role for a 5yr old part. So my question is: What is the reliability of this kind of equipment after 5 yr ? Can it last 10 yr with no or few problems ? Since our budjet is tight, not buying another SAN will be a big plus. This lead me to another question: FC disks cost an arm and a leg from IBM. When I type the replacement # in google (for example IBM 300GB 15K 4GBPS FC HDD 42D0410), I can find it at a fraction of the price at various sites. So am I stupid to buy from IBM or naive to trust 3rd party reseller ?? Thanks, Chris

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• Authenticating Active Directory Users to Mac OS X Mavericks Server L2TP VPN Service

  - by dean

  We have a Windows Server 2012 Active Directory Infrastructure that consists of two domain controllers. Bound to the Active Directory Domain is a Mac OS X Mavericks Server 10.9.3. The server runs Profile Manager and VPN Services. My Active Directory users are able to authenticate to the Profile Manager, but not the VPN. I have found several threads on other forums of other users reporting similar issues, here is just one of many references: https://discussions.apple.com/thread/5174619 It appears as though the issue is related to a CHAP authentication failure. Can anyone suggest what next troubleshooting steps I might take? Is there a way to liberalize the authentication mechanism to include MSCHAP? Here is an excerpt of the transaction from the logs. Please note the domain has been changed to example.com. Jun 6 15:25:03 profile-manager.example.com vpnd[10317]: Incoming call... Address given to client = 192.168.55.217 Jun 6 15:25:03 profile-manager.example.com pppd[10677]: publish_entry SCDSet() failed: Success! Jun 6 15:25:03 --- last message repeated 2 times --- Jun 6 15:25:03 profile-manager.example.com pppd[10677]: pppd 2.4.2 (Apple version 727.90.1) started by root, uid 0 Jun 6 15:25:03 profile-manager.example.com pppd[10677]: L2TP incoming call in progress from '108.46.112.181'... Jun 6 15:25:03 profile-manager.example.com racoon[257]: pfkey DELETE received: ESP 192.168.55.12[4500]->108.46.112.181[4500] spi=25137226(0x17f904a) Jun 6 15:25:04 profile-manager.example.com pppd[10677]: L2TP connection established. Jun 6 15:25:04 profile-manager kernel[0]: ppp0: is now delegating en0 (type 0x6, family 2, sub-family 0) Jun 6 15:25:04 profile-manager.example.com pppd[10677]: Connect: ppp0 <--> socket[34:18] Jun 6 15:25:04 profile-manager.example.com pppd[10677]: CHAP peer authentication failed for alex Jun 6 15:25:04 profile-manager.example.com pppd[10677]: Connection terminated. Jun 6 15:25:04 profile-manager.example.com pppd[10677]: L2TP disconnecting... Jun 6 15:25:04 profile-manager.example.com pppd[10677]: L2TP disconnected Jun 6 15:25:04 profile-manager.example.com vpnd[10317]: --> Client with address = 192.168.55.217 has hung up

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