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• Remote logging for multiple Apache virtual hosts using syslog-ng

  - by James

  I'm running a couple Apache web servers that each have 4-8 separate virtual hosts on each of them. I'm trying to setup a dedicated log server that stores each virtual host access and errors logs in a separate directory for that virtual host. For example on the logging server, /var/log/remove/10.0.0.2/virtualhost1 contains access_log and error_log /var/log/remove/10.0.0.2/virtualhost2 contains access_log and error_log /var/log/remove/10.0.0.3/virtualhost3 contains access_log and error_log and so on... Right now I have it split up by host but I can't figure out how to do it additionally by virtual host. Here are the relevant lines from the logging server's syslog-ng.conf source r_src { tcp(ip("0.0.0.0") port(5140)); }; destination r_all { file("/opt/splunk/logs/$HOST"); }; log { source(r_src); destination(r_all); }; Any help would be appreciated. Thanks!

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• How would I / could I obtain an reasonably comprehensive list of domain names?

  - by Simon

  I know that domain names are constantly changing, and I know there are a lot of them, but there is clearly a region of the domain name space which is stable. How would I go about getting a list, even a very big one? Such a thing must logically exist, even if it is in a distributed form, because the web's DNS servers resolve names to IP addresses. So in theory if I could poll all the DNS servers in the world at a moment in time I would have the complete list of mapped names. Is there a practical way of doing that? As an aside, does anyone have any good estimates of how many domain names exist at the moment?

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• apache2 default namevirtualhost

  - by Zulakis

  I got a site server.com which I want to be returned when it is directly adressed using server.com or www.server.com but issue a 404 if the webserver gets accessed using its ip or another hostname. I got something like the following: NameVirtualhost 10.0.0.1:80 <VirtualHost 10.0.0.1:80> #This should be used if Host is server.com or www.server.com ServerName server.com ServerAlias server.com www.server.com DocumentRoot /var/www/ </VirtualHost> <VirtualHost 10.0.0.1:80> #This should be used alternatively RewriteEngine On RewriteRule (.*) - [R=404] </VirtualHost> How can I now set that the second entry should be used if hostname is not server.com or www.server.com?

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• Cisco IOS PBR - PBRing Skype

  - by Azz

  I've got a very simple question, which seems to be extremely difficult when put into practice. I have a Cisco IOS router with two Internet links (one over a WAN, through a proxy, everywhere, etc.) the other direct Internet. Most traffic destined for the internet goes through the proxy over the WAN. I want Skype traffic (why the client uses skype, I don't know..) to go out of the Internet link, while the rest of the traffic goes over the WAN through the proxy, etc. Apparently skype is very difficult to detect/classify because of it's many adaptations to being blocked. Is there any way to identify Skype on an IOS router (2911), and set it's next hop IP/interface? Thank you, Aaron

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• Where did this incorrect cached DNS lookup come from?

  - by Stephen Jennings

  Somehow, I've been having a chronic issue where my computer will get an invalid DNS lookup in its cache for either of the two Exchange servers I use from Mail.app. My workplace runs one of the Exchange servers and I run the other (they are totally unrelated, hosted by different companies, etc.). The problem manifests as a certificate domain error. When it happens, I can run nslookup mail.mydomain.com and I see the incorrect IP address (usually owned by either Apple or Akamai), but if I run nslookup mail.mydomain.com 8.8.8.8, I get the correct address. My real quest is to find out why this keeps happening, and to do that, I'd like to know which server is supplying me this bad DNS entry. Is there a way to check my DNS cache to see where this bad lookup came from?

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• Good option for a transparent internet gateway on Mac OS X

  - by Gareth

  Hi I have a small network of Mac systems, and would like to add some internal monitoring of our internet usage, which has recently begun to climb. I would like to configure one of the machines as an internet gateway, and install some monitoring software that could provide graph indications of network usage by machine. The machine would then double as a workstation and as the internet gateway. I can manually configure the machines on the network to use it as a gateway, and would prefer to avoid an explicit http proxy (although it is an option if necessary). What software would serverfault users recommend to provide simple, easily configurable and maintainable network monitoring on Mac OS 10.5.7 (non-server)? The simplest requirement is monitor usage by IP Address, but additional tracking (e.g. destination, protocol, etc) would be useful.

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• IIS 6.0 subdomains with host headers and non existent subdomains

  - by Mustafakidd

  Hey Everyone - We have a wildcard A-Record pointing to our IP and have a number of sites running on IIS 6 with host headers and have a a wildcard SSL certificate for the domain so that each site can run under SSL. For example: https://A.foo.com https:/B.foo.com https:/C.foo.com Everything is working well but I noticed that when we type a non existent subdomain, say D.foo.com, it redirects to A.foo.com. Any idea why that is or how I can change that? I think we may have set up the A.foo.com site before we applied the wildcard A-record with our domain provider and before we had set up the SSL cert. Thanks.

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• NAS disk - problem with accessing SAMBA

  - by dominolog

  Hello I have a NAS disk running on some version of Linux. The disk is located in local network (5 PC running XP or Vista, all connected to Linksys Router). I have problems accessing NAS resources through SAMBA. The 1st issue is that the NAS is not accessible through hostname (even if it is configured), 2nd point is that it is mostly not accessible through IP manner (\IP_OF_NAS). Rest of services (FTP, HTTP access) works flawlessly. I connected the NAS to my home network (only 1 WinXP and Linsys router) and the NAS is working fine - SAMBA access together with hostname recognition works perfectly. I wonder this is an issue with WINS? Could anybody help? Regards

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• Separating two networks

  - by Farhan Ali

  I have two routers, R1 and R2. R1 (a stock linksys router running dd-wrt) is connected to internet and is serving internet to a network of 5 devices/PCs running a DHCP server, with a network of 192.168.1.0/24. R1 also serves internet services to R2. R2 (a ubuntu server 12.04) gets internet from R1. R2 has 3 PCs attached to it, runs a DHCP server with a network of 172.22.22.0/24. My requirement is that the clients on both sides should not talk to each other at all – with the exception that R1 clients may access the R2 router through its IP of 192.168.1.x. At the moment, R2 clients are able to ping R1 clients, which is unacceptable, whereas R1 clients cannot ping R2 clients, which is OK. I believe iptables could be set up but I don't know how.

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• Why are certain default application associations "locked"?

  - by H.B.

  Edit: As i now have three answers that do not answer the question: This question is not about getting the association to work again. I do not like fighting symptoms, i prefer cures. After associating my MP3 files with MPlayer using the Open with/Choose default program... dialogue i can no longer change that association using said dialogue, the Always use this [...] Checkbox is henceforth always greyed out (Control Panel > Default Programs > Associate a file type or protocol with a program does not let me change it either, it seems to just use the same dialogue anyway). That also happened for MP4s but not for MKVs for example, and if i associate my MP3s with other applications like VLC it does not get blocked. I would really like to know why that is and if i can avoid this beforehand (thankfully i know ways to fix it afterwards already). Edit: Another obervation: The blocking programs (i managed to block it with an association to Visual Studio as well) do not appear in the Recommended Programs of the open-with-dialogue (And the explorer said: "The current program is not recommended, but i won't let you change it, ha!"). Edit: A screenshot as requested: As you can see on the top left (if you know the icon of MPlayer), the file is currently associated with MPlayer. Edit: Ways to fix it (Note: This question is not about fixing it) Using the Default Programs Control Panel > Default Programs > Set Default Programs, select WMP, Choose defaults for this program, check .mp3 This should reassociate the files with WMP and you can create a new association in the explorer. Using the registry (As always, keep your hands off it unless you know what you are doing or if you are fine with accidentally breaking your system) HKEY_CURRENT_USER > Software > Microsoft > Windows > CurrentVersion > Explorer > FileExts > .mp3 Here you could for example clean up the open-with-list, and the current default program seems to be saved here as well in the key UserChoice, there you can change the ProgId string to another application, you can associate it with WMP by entering WMP11.AssocFile.MP3 or just pick another application right away. You may need to mess with permissions on the key though, if you cannot change the ProgId value.

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• Cannot Access a Shared Folder Using Windows 2008

  - by peter

  Hi All, I have a NAS drive, and this is sharing some folders. I cannot access those folders from a windows 2008 machine which is on the network. The are both connected to the same network switch. e.g. if I go like this, \\server\ or \\server\folder I get the message 'windows cannot access \\server check the spelling, click diagnose' etc. Error code: 0x80004005 The thing is that I can connect to this shared drive from a windows 7 laptop connected wirelessly to the same network. I can ping the server from windows 2008, but only if I use the IP address, not the server name.

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• Change the order of DNS lookup when connected in the VPN

  - by qwerty2010

  Hi, Using Windows 7 Pro here. I have my LAN network adapter with DNS server 8.8.8.8 (Google's DNS). I also have OpenVPN client to connect to my company's network. If I type "nslookup" while disconnected from the VPN, I get 8.8.8.8 (from my LAN network adapter). If I type "nslookup" while connected in the VPN, I get the DNS IP from my company's network. That makes me think that when connected to the VPN all DNS's resolution are routed first to my company's DNS. How can I change this order, and make the DNS resolution be routed to 8.8.8.8 first, when I'm connected to the VPN? Thank you

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• Port Forwarding a Specific Port (e.g. 22)

  - by Jerry Blair

  I'm still confused about establishing an SSH connection (port 22) between two computers on different internal networks. For example: I am on my computer with internal IP address IIP-1, connected to my router RT-1. There are 10 IIPs connected to RT-1. I want to establish an SSH connection to IIP-3 which is connected to router RT-2. There are 10 IIPs connected to RT-2. At any time, there can be multiple SSH connections between IIPs on RT-1 and RT-2. Since I only have port 22 available, I don't know which SSH session is talking between which IIPs. I looked at a couple of similar questions but am still unclear on the solution. Thanks much, Jerry

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• private address in traceroute results

  - by misteryes

  I use traceroute to check paths on a remote host, and I notice that there are some private IPs, like 10.230.10.1 bash-4.0# traceroute -T 132.227.62.122 traceroute to 132.227.62.122 (132.227.62.122), 30 hops max, 60 byte packets 1 194.199.68.161 (194.199.68.161) 1.103 ms 1.107 ms 1.097 ms 2 sw-ptu.univ.run (10.230.10.1) 1.535 ms 1.625 ms 2.172 ms 3 sw-univ-gazelle.univ.run (10.10.20.1) 6.891 ms 6.937 ms 6.927 ms 4 10.10.5.6 (10.10.5.6) 1.544 ms 1.517 ms 1.518 ms why there are private addresses near the host? what are the purposes that these private addresses are used? I mean why they want to put the public IP behind private IPs? thanks!

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• Nginx proxy cache (proxy_pass $request_uri;)

  - by imastar

  I need to create proxy web using nginx. If I access http://myweb.com/http://www.target.com/ the proxy_pass should be http://www.target.com/ Here is my configuration: location / { proxy_pass $request_uri; proxy_cache_methods GET; proxy_set_header Referer "$request_uri"; proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_ignore_headers Cache-Control; proxy_hide_header Pragma; proxy_hide_header Set-Cookie; proxy_set_header Cache-Control Public; proxy_cache cache; proxy_cache_valid 200 10h; proxy_cache_valid 301 302 1h; proxy_cache_valid any 1h; } Here is the log error 2013/02/05 12:58:51 [error] 2118#0: *8 invalid URL prefix in "/http://www.target.com/", client: 108.59.8.83, server: myweb.com, request: "HEAD /http://www.target.com/ HTTP/1.1", host: "myweb.com"

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• new web site on windows 2008 server with IIS7 - does not work

  - by user22817

  Hi guys, I have a new domain: www.biografica.ro which was bought 3 months ago but never used still then. I've bought a server with Windows 2008 server instaWeb Server (IIS). I've added a new site in C:\inetpu\wwwroot directory and did the setting (assigned the default ip to www.biografica.ro host etc -i've did on IIS6 one year ago, so i think i know to set up it correctly)... The problem is that the default site created by IIS instalation is working, but mine is not. It is started but is says: This link appears to be broken in Chrome and "The webpage cannot be found" (in IE). Do you know guys what i;ve done wrong? As i know a domain takes time to propagate but i think locally it should work.. Please help...i've spent 3 hours and cannot find a way...:(

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• CentOS 6.5 as WebServer for Django Dev

  - by Charlesliam

  During CentOS 6.5 Installation I choose WebServer type for this computer. The server has a static IP address 192.168.111.100. The CentOS was updated I managed to install virtualenv with Python 2.7. Within the virtualenv, I'll be using Django Framework. After I tried to run the command using root user python manage.py runserver 0.0.0.0:8000 I can't see the website from other computer within the LAN when I try to type 192.168.111.100:8000/admin on my browser. I already disable firewall using service iptables stop I can ping the 192.168.111.100 and I have a good feedback with nslookup. What seems the problem of my config?

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• How do I send email with sendmail to external hosts?

  - by Jake

  If I wanted to send an email to a user on the same linux machine, I can run: echo -e "Subject: Foo\n\nBar\n" | sendmail -v jacob But if I run: echo -e "Subject: Foo\n\nBar\n" | sendmail -v [email protected] It will give me the error: 050 >>> MAIL From:<jacob@mu> SIZE=321 050 550 5.1.8 Cannot resolve your domain {mx-us011} If my machine has access to the internet but is behind a router and has no domain associated with it, can I use sendmail to send mail to this address? Do I need to connect through an SMTP server? Can I do that with sendmail? If I use sendmail's -f option and put my gmail account there it will work. Can (or should I) I use my IP address? echo -e "Subject: Foo\n\nBar\n" | sendmail -v -f [email protected] [email protected] I'm a bit lost on how all this comes together in sending mail from the command line.

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• NFS denies mount, even though the client is listed in exports

  - by ajdecon

  We have a couple of servers (part of an HPC cluster) in which we're currently seeing some NFS behavior which is not making sense to me. node1 exports its /lscratch directory via NFS to node2, mounted at /scratch/node1. node2 also exports its own lscratch, which is correspondingly mounted at /scratch/node2 on node1. Unfortunately, whenever I attempt to mount either NFS export on the opposite node, I get the following error: mount: node1:/lscratch failed, reason given by server: Permission denied This despite the fact that I have included first the IP range (10.6.0.0) and then the specific IPs (10.6.7.1, 10.6.7.2) in /etc/exports. Any suggestions? Edit to remove ambiguity: I've made sure that exports only contains either the range, or the specific IPs, not both at the same time.

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• Nagios3 gives a warning on HTTP service monitoring

  - by Dez

  Already set up my local net configuration to be monitored by Nagios3. I found a problem that Nagios3 reports a warning in the HTTP monitoring service of a Debian server set at ip 192.168.1.52, that has an individual virtual host and a mass virtual host for application development. I get this status message: HTTP WARNING: HTTP/1.1 404 Not Found I used the Nagios tools to check. servername is the name of the vhost server name I used in the Apache configuration. /usr/lib/nagios/plugins/check_http -H servername -I 192.168.1.52 receiving this status message: HTTP OK HTTP/1.1 200 OK - 37900 bytes in 0.504 seconds |time=0.503946s;;;0.000000 size=37900B;;;0 But when I check like this: /usr/lib/nagios/plugins/check_http -I 192.168.1.52 I get the same status message as the warning, so I assume that I don't have Nagios completely well set up because doesn't recognize the vhosts for that server, how it should be as the check_http service shows. Where should I look to fix that warning?

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• Wireless printer going offline upon entering power save mode

  - by Regmi

  I recently bought a printer, Samsung ML1865W, a wireless laser printer. It works very well, wirelessly until after a while, it goes to power save mode when the printer goes offline. I then cannot connect to the printer (pinging the ip and various ports associated with it do not give any response) until I power cycle the printer. I have checked my wireless settings and my router, I have installed the printer software in WinXP, Win2000 and in Mac and the printer behaves just the same. Any ideas if the printer hardware itself is broken or that its something on my network/application side that's the culprit. If you own the printer, have you had any trouble like that at any time?

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• Multicast accross the subnets

  - by Hasan Khan

  My application sends some UDP packets on a multicast address. In our office we have 3 subnets connected via routers. Sitting in my subnet I'm able to ping the IP of the other subnet. Will multicast packets cross my subnet and reach the machines of other subnets? Or router will need some configuration? Or do I have to program a bridge for it? Please note that I do not know anything about Networking. Kindly tell me something that I can ask my network admin to do.

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• Simple, manageable DNS on EC2?

  - by dkulchenko

  I'm working on a large network of servers sitting on EC2, and need a way for the servers to know about each other's locations in the cloud. I thought the simplest way would be to use DNS, because if I replace the EC2 instance, I simply update the DNS record, and the rest of the servers will know about it (with names like users.db.mysoft.com, routing.mysoft.com, cluster1.memcached.mysoft.com). I'm considering setting up a master DNS server on a micro/small instance to accommodate this. I'd preferably need something that's as simple as a key-value store (hostname - IP) into which the platform could remotely add/remove entries. Can I do this with BIND? Or is there a better solution?

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• SQL Server iSCSI session issue with a NetApp SAN

  - by Matt Beckman

  We had an issue early this morning when iSCSI issues broke connectivity with a few of our databases (resulting in a SQL Server Error 21). Attempts to DBCC CheckDB did not work, and the only solution was to restart the SQL Service. Is there a known reason why an iSCSI initiator session would reset itself out of the blue? Example below from the NetApp syslog. This set of errors was replicated 4 times (once for each SQL server in production). Only one SQL server was noticeably impacted, however. [san1: iscsi.notice:notice]: ISCSI: iswta, ISID Rule: new connection from same initiator, shutting down old session 7 [san1: iscsi.notice:notice]: ISCSI: iswta, New session from initiator iqn.1991-05.com.microsoft:sql1.example.corp at IP addr 10.xxx.xxx.123

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• Mount TMPFS instead of ro /dev

  - by schiggn

  I am working on a ARM-Based embedded system with a custom Debian Linux based on kernel 2.6.31. In the final system, the Root file system is stored as squashfs on flash. Now, the folder /dev is created by udev, but since there is no hot plugging functionality needed and booting time is critical, I wanted to delete udev and "hard code" the /dev folder (read here, page 5). because i still need to change parameters of the devices (with ioctl /sysfs) this does not work for me in this case. so i thought of mounting a tmpfs on /dev and change the parameters there. is this possible? and how to do best? my approach would be: delete /dev from RFS create tar containing basic devices mount tmpfs /dev untar tar-file into /dev change parameters Could this work? Do you see any problems? I found out, that you can mount on top of already mounted mount point, is it somehow possible just to take data with while mounting the new file system? if so that would be very convenient! Thanks Update: I just tried that out, but I'm stuck at a certain point. I packed all my devices into devices.tar, packed it into /usr of my squashfs and added the following lines to mountkernfs.sh, which is executed right after INIT. #mount /dev on tmpfs echo -n "Mounting /dev on tmpfs..." mount -o size=5M,mode=0755 -t tmpfs tmpfs /dev mknod -m 600 /dev/console c 5 1 mknod -m 600 /dev/null c 1 3 echo "done." echo -n "Populating /dev..." tar -xf /usr/devices.tar -C /dev echo "done." This works fine on the version over NFS, if I place printf's in the code, I can see it executing, if I comment out the extracting part, its complaining about missing devices. Booting OK mmc0: new high speed SDHC card at address 0007 mmcblk0: mmc0:0007 SD04G 3.67 GiB mmcblk0: p1 IP-Config: Unable to set interface netmask (-22). Looking up port of RPC 100003/2 on 192.168.1.234 Looking up port of RPC 100005/1 on 192.168.1.234 VFS: Mounted root (nfs filesystem) on device 0:14. Freeing init memory: 136K INIT: version 2.86 booting Mounting /dev on tmpfs...done. Populating /dev...done. Initializing /var...done. Setting the system clock. System Clock set to: Thu Sep 13 11:26:23 UTC 2012. INIT: Entering runlevel: 2 UBI: attaching mtd8 to ubi0 Commenting out the extraction of the tar mmc0: new high speed SDHC card at address 0007 mmcblk0: mmc0:0007 SD04G 3.67 GiB mmcblk0: p1 IP-Config: Unable to set interface netmask (-22). Looking up port of RPC 100003/2 on 192.168.1.234 Looking up port of RPC 100005/1 on 192.168.1.234 VFS: Mounted root (nfs filesystem) on device 0:14. Freeing init memory: 136K INIT: version 2.86 booting Mounting /dev on tmpfs...done. Populating /dev...done. Initializing /var...done. Setting the system clock. Cannot access the Hardware Clock via any known method. Use the --debug option to see the details of our search for an access method. Unable to set System Clock to: Thu Sep 13 12:24:00 UTC 2012 ... (warning). INIT: Entering runlevel: 2 libubi: error!: cannot open "/dev/ubi_ctrl" So far so good. But if I pack the whole story into a squashfs and boot from there, it is acting strange. It's telling me while booting that it is unable to open an initial console and its throwing errors on mounting the UBIFS devices, but finally provides a login anyway. Over that my echo's are not executed. If I then log in, /dev is mounted as TMPFS as desired and all the devices reside inside. When I redo the "mount" command to mount the UBIFS partitions it is executed whitout problem and useable. From squashfs VFS: Mounted root (squashfs filesystem) readonly on device 31:15. Freeing init memory: 136K Warning: unable to open an initial console. mmc0: new high speed SDHC card at address 0007 mmcblk0: mmc0:0007 SD04G 3.67 GiB mmcblk0: p1 UBIFS error (pid 484): ubifs_get_sb: cannot open "ubi1_0", error -19 Additionally, a part of the rest of the bootscripts is still exexuted, but not all of them. Does anyone has a clue why? Other question, is 5MB enough/too much for /dev?

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