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• syslog-ng fails to log on lxc host

  - by christian

  we are running CentOS 6 servers with multiple lxc-containers. For system logging we are using syslog-ng. After a while the syslog-ng daemon stops logging messages, but the daemon keeps running. This happens on the host and inside the containers (where another syslog-ng is running) as well. We could not find any patterns for the failure yet but we assume that it has something to do with lxc, because we don't have these problems on other hosts. We have the suspicion that these problems occur when more than on lxc-container is running and that only "new" processes can not log. We are running the following software versions: CentOS-Linux 6.4/6.5 lxc-0.7.5 syslog-ng-3.2.5 Do you have any ideas? Best regards trademesh

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• Encrypt LAN and wifi traffic on small private network

  - by Grimlockz

  I need some advice about encrypt all traffic on a small private network running wi-fi and LAN traffic on 192.168.0.x network. The network would comprise of client laptops connecting to the wi-fi router (192.168.0.254) via ethernet connection or wireless. The main purpose of the server is for the client laptops to talk to two servers on different IP's (192.168.0.200 and 192.168.0.201) on ports 80 and 433. My main concern is having packet sniffers and what not getting access to the data. The only ways I see at the moment is to have VPN running on the network or use IPSec policy's to do this. Any other ways guys?

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• Port 53 UDP Outgoing flood

  - by DanSpd

  Hello I am experiencing very huge problem. I have 4 computers in network, and from each a lot of data is being sent to ISP name servers. Sometimes data is being sent a little from each computer in network, sometimes it is just a lot of data from one computer. I have antivirus (Avast) and malware scan (SpyBot) I know port 53 UDP is dns which resolves domain IP so its' needed. Also I have read that ISP name server might have been infected. So what is the best thing to do in this situation. Also sometimes internet starts to lag really because of port 53

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• Why does DNS work the way it does?

  - by sabof

  This is a Canonical Question about DNS (Domain Name Service). If my understanding of the DNS system is correct, the .com registry holds a table that maps domains (www.example.com) to DNS servers. What is the advantage? Why not map directly to an IP address? If the only record that needs to change when I am configuring a DNS server to point to a different IP address, is located at the DNS server, why isn't the process instant? If the only reason for the delay are DNS caches, is it possible to bypass them, so I can see what is happening in real time?

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• data replication from a production web server back to the staging web server

  - by Dennis Smith

  Have two web servers, development/staging and production. Code and some documentation is moved from the staging area to production either through on-demand jobs or nightly via a global replication job. The production server of course sits isolated in a DMZ. There is some content that gets uploaded to the live server that needs to be replicated back to staging. Our security team is locking the network down (and they should) and restricting access to the live server. Best suggestions for replication of "live" data back to "stage" and backing up the live server also.

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• Puppet: how to use data from a MySQL table in Puppet 3.0 templates?

  - by Luke404

  I have some data whose source-of-truth is in a MySQL database, size is expected to max out at the some-thousands-rows range (in a worst-case scenario) and I'd like to use puppet to configure files on some servers with that data (mostly iterating through those rows in a template). I'm currently using Puppet 3.0.x, and I cannot change the fact that MySQL will be the authoritative source for that data. Please note, data comes from external sources and not from puppet or from the managed nodes. What possible approaches are there? Which one would you recommend? Would External Node Classifiers be useful here? My "last resort" would be regularly dumping the table to a YAML file and reading that through Hiera to a Puppet template, or to directly dump the table in one or more pre-formatted text file(s) ready to be copied to the nodes. There is an unanswered question on SF about system users but the fundamental issue is probably similar to mine - he's trying to get data out of MySQL.

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• Is there an apache module to slow down site scans?

  - by florin

  I am administering a few web servers. Each night, random hosts from the Internet are probing them for various vulnerabilities in php, phpadmin, horde, mysqladmin, etc. Is there a way (apache plugin?) to slow down the rate of attack? For SSH, I have a rate limiting rule on the firewall, which does not allow more than three connections per minute. But I don't want to rate limit all HTTP access, only the access that returns 404s. Is there such an apache module?

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• DFS-R (2008 and R2) 2 node server cluster, all file writes end in conflictAndDeleted

  - by Andrew Gauger

  Both servers in a 2 server cluster are reporting event 4412 20,000 times per day. If I sit in the conflictAndDetected folder I can observe files appearing and disappearing. Users report that their files saved by peers at the same location are overriding each other. The configuration began with a single server, then DFS-R was set up using the 2008 R2 wizard that set up the share on the second server. DFSN was set up independently. Windows users have drives mapped using domain based namespace (\domain.com\share). Mac users are pointed directly to the new server share created by DFS-R. It is PC users indicating most of the lost files, but there has been 2 reports by Mac users about files reverting.

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• Hosting discussion forums on Windows 2008 Server / IIS, what software to use?

  - by Lasse V. Karlsen

  A plan to look into hosting discussion forums related to our product, on our own servers, has arisen, and I can't seem to find any pure .NET or Windows-based discussion forums. Since we're a pure Windows-based company, installing something that requires MySQL or Linux is going to require administration knowledge we don't currently have. What are our options? Every site I find that shows how to set up discussion forums on IIS involves just taking one of the many LAMP-based ones and tweaking IIS to run PHP or similar to run it. Isn't there a .NET-based discussion forum software? Free or not doesn't matter at this stage, right now we're just looking for options.

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• Configuring Mail Relay

  - by ServerChecker

  I'm running Ubuntu Server 9.10 with Postfix and Webmin. I have created virtual hosts for 3 domains following this serverfault.com answer. But the mail isn't relaying out to the world. I have 3 domains tied into my DNS in webmin, as well as inside DNS clicked Mail Server and followed that instruction using this article on the web. The domains and the web servers work just fine. I also have FTP working just fine. So, the remaining problem I have is mail. Can't forward mail out to a Gmail account for some reason. Note I'm just trying to do the "easy version" of Postfix config and if your answer is in Webmin-ease, that would help me. However, I can edit a text file if you suggest.

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• NLB RPC server is unavailable on the specified computer

  - by Robin Weston

  Hi guys, Firstly, I'll admit that my networking knowledge is limited so as people request more information I'll update this question accordingly. I am trying to create a NLB Cluster across 2 Windows Server 2008 Web Servers. Neither of the machines are members of a domain, and both have 2 NICs (one for processing external web traffic, and one for communicating internally). I have installed NLB on both machines, and have created a cluster on Host A and added itself to it. However, when I try and add Host B (using the address from the external NIC) I get the following error : "The RPC server is unavailable on the specified computer". On Host B I can see that the RPC service is running fine. I can also ping and RDP from Host A to Host B with no problems either. I have disabled the windows firewall on both machines but that had no effect

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• Achieving/maxing out 1GBPS connectivity on a nginx server

  - by Ansell Cruz

  This page (http://www.remsys.com/nginx-on-1gbps) claims that it can max out a 1gbps line using JBOD setup and no raid. Currently I'm on a 1gbps dedicated port and I'm on raid 10 (4x2TB - the disks that comes with 100tb.com servers). Currently I'm only peaking at 500-550mbps. wa% would show something around 20% everytime. I'm looking into maxing out this 1gbps port because I have an unmetered service from them. Do you guys think that the page that I referenced would be better than my current raid setup? Do you guys have any other suggestions on how to max out the performance of this server? TYI.

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• thought on real time web analytics

  - by Linus

  we have a few web servers and am planning to create a dashboard to show the real time stats ip address,geo-location and other custom data based on database lookups. Splunk sort of fits perfectly but wondering if there are any open source alternative . i have looked at logstash and graylog2, but to my knowledge they are more of a log analysis tools. Piwik is sort of interesting except that i cannot put any javascript on the webpages. All i have access to is apache web log. Any recommendations please..

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• Cannot access Network Shares on Windows Server 2008 running VisualSVN Server

  - by mwillmott

  I have installed VisualSVN server on Windows Server 2008. The server is part of a domain but not the domain controller, it is just a data server and now an SVN server. VisualSVN uses port 80 and can only be access from inside the network (i do i by going to the dns name of the server). However, ever since i have installed this, other computers on the network can no longer access the shared folders on the server EXCEPT the domain controller which has no problems accessing the shares. I am stumped, i am guessing it is something to do with Apache running and not using host-headers (or whatever the Apache equivalent may be) but just being bound to the servers DNS name or IP. Any suggestions?

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• How to document linux server configuration?

  - by Margaret Thorpe

  Hi, I have about 20 linux servers which I need to document the configuration of. I do not mean the detailed configuration of services, but rather user accounts, databases, databases accounts, ip addresses, physical location, SSH port etc. etc. I know all this data is stored in config files, but I want to centralize it all. I am considering just creating a spreadsheet to record this data, but was wondering if there is something better (perhaps a small php/mysql app) which would be more structured and complete than a hacked together spreadsheet. What do you use?

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• Anyone interested in obtaining a cable list from a visio Diagram? [closed]

  - by Alex

  it's my first post here. Just wondering if anyone had to deal with the following problem - you have to install over say a 100 network elements and servers - cabling is done via contractors, so you need to provide them with an accurate, error-free cable list - your inputs are a set of detailed, port by port, visio diagrams. Prb is to obtain the cable list and get the cabling started while you're busy crafting the switch/routers configs. I coded a Visio plugin, which I plan to release under the GNU license, that returns a cable list from a diagram, and tested it on intermediate size infrastructure, 2K+ cables. It works well. The tool needs a little work to be user friendly, so before getting started, I wanted to know if that was worth the effort. Questions are welcomed, let me know -A PS: the tool is targeted for those who need a port by port description of their network, in the form Source/slot/port/Destination/slot/port.

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• ASP.NET website http requests appear to be queueing

  - by scolemann

  We cloned our servers this weekend into a colo. All non-asp.net sites are performing great, but ASP.NET sites are very slow. It appears to be an issue with the requests/connections, but I cannot figure out where. The reason I think it is a problem with the connections is that when I launch fiddler and watch the requests, all requests appear to happen sequentially. Even the static image requests are taking 5 seconds and another one doesn't start until the first one finishes. MaxConnections is set to 100 in machine.config and the "website connections" are set to unlimited. Any idea what else coudld be causing this? from machine.config:

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• Why is scp not overwriting my destination file?

  - by Noli

  I'm trying to back up a file via the command scp /tmp/backup.tar.gz hostname:/home/user/backup.tar.gz When I run it, the scp progress bar shows up and it looks like its transferring the file, however when I log into the destination server to check the file, the timestamp and filesize haven't changed from the older version, so it looks like scp didn't overwrite the old file at all. It only sees to work when I manually delete the file from the destination server. I'm running ubuntu, and this is happening on two servers: one cygwin ssh, and one fedora core 3. Anyone have any idea why this is happening? I thought scp would ONLY overwrite existing files.. Thanks

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• cannot access my own computer through My Network Places

  - by vgv8

  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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• HAProxy NGInx SSL setup

  - by Niclas

  I've been looking around different setups for a server cluster supporting SSL and I would like to benchmark my idea with you. Requirements: All servers in the cluster should be under the same full domain name. (http and https) Routing to subsystems is done on URI matching in HA proxy. All URIs have support for SSL support. Wish: Centralizing routing rules ---<----http-----<-- | | Inet -->HA--+---https--->NGInx_SSL_1..N | | +---http---> Apache_1..M | +---http---> NodeJS Idea: Configure HA to route all SSL traffic (mode=tcp,algorithm=Source) to an NGInx cluster turning https traffic into http. Re-pass the http traffic from NGInx to the HA for normal load-balancing which performs load balancing based on HA config. My question is simply: Is this the best way to to configure based on requirements above?

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• Set up DPM to use hardware VSS Provider with EMC Clariion SAN

  - by Ryan

  We recently purchased an EMC Clariion AX4 SAN and we're using it to provide storage for our Hyper-V virtual machines. I've already got the servers registered with it and configured the failover cluster CSV's, etc. I'm wanting to figure out what I have to do to set up the VSS Provider for the SAN, so that Microsoft Data Protection Manager can use it to backup the virtual machines. I'm new when it comes to Clariion SAN's, so I have no idea how to set up the VSS provider. I downloaded something from Powerlink that was labeled VSS Provider and installed it on one of the machines connected to the SAN. It had something to do with a Solutions Enabler (I don't know what that is), but it doesn't really seem like it did anything. I read something that suggested I'd need to have Navisphere Manager to use the VSS Provider on the AX4, but we didn't purchase that - we're just using Navisphere Express. Can anyone help me figure out how to get the VSS Provider up and running?

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• Wrong DNS for just one site on development machine

  - by Patrick

  www.superyoink.de is my clients' website. I can access it from any machine except my development one. If I ping it on my development machine, I get 80.67.28.107 - this is wrong. My laptop, next to me, is able to resolve it correctly. I have tried putting correct address into hosts like so: 93.187.232.191 www.superyoink.de Still resolves to wrong address. I can enter bogus DNS server addresses so nothing works. But www.superyoink.de still resolves to 80.67.28.107. Rebooted, did ipconfig /flushdns nothing seems to work. I run 32 bit Vista. My impression is that it has stored the wrong dns resolution somewhere and is not even trying the DNS servers. But where? Help please!

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• Transferring websites from x64 to x86 server

  - by Ke

  Hi, I run a x64 staging server here along with the following: Solr Java etc. However, I am about to get a linode vps for production and quickly realising that x86 is the way to go for their lowest RAM package (thinking to upgrade later). My staging server is x64 with 12gb ram, so going down to 300mb ram is going to feel devilishly slow ;/ Here are my questions: 1) Will I have problems transferring my scripts, dbs etc from a x64 to x86 server? e.g. solr indexes 2) Is it worth going for the x86 package? I am probably going to upgrade later down the line and x64 might be better for the servers with more RAM? should I stick with x64 instead as there isnt much difference when using with low RAM? Cheers Ke

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• Enable user registration - eJabberd

  - by travega

  I am a complete n00b to configuring Jabber/XMPP servers and I am hoping to get some help getting set up. I have done all of this and installed pidgin. I seem to be able set up my "admin-user" in pidgin no problem but when I try to register a new user I get a 403 Fobidden message back from pidgin. Do I need to change the ejabberd.cfg file to allow users to register? If so how do I go about it? If not what do I need to get basic chat and fileshare going?

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• Free DNS software with failover support?

  - by Lin

  I'm looking for DNS software that can accomplish the following: Check health of all A records at set intervals If server is unresponsive after multiple successive checks, replace A record with a working server When a server is down, check it periodically. Once it's up, restore normal A records Here's an equivalent I thought of: Run DNS servers with very low TTL (minutes) Use a cron job to periodically query all webservers Use sed to replace A records if need be, and then restart DNS server I have a hard time believing there isn't already something that can accomplish the above. I'm not looking for a paid service, and I'm restricted to anything I can run with root access to a VPS. Any suggestions would be great. Thanks!

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