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  • Multiple Screens, Multiple OS

    - by Cenoc
    Hey, Around two days ago I saw someone working on a computer and alt-tabing to different OSs. Basically he had 3 "screens", one with Fedora, one with Windows XP, one with Mac OSX. How is that possible? I dont think it was a virtual machine.... sounds friggin awesome though.

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  • Sendmail yields "user unkown" errors even after (wrongly) setting up a catch-all account

    - by user59240
    I was trying to follow the instructions found here to set up a catch-all account, but still I get the following message for mails sent to non-existent users: The error that the other server returned was: 550 550 5.1.1 [email protected]... User unknown (state 14). Everything else works, though... /etc/mail/local-host-names and /etc/mail/virtusertable were set up as instructed. Any advice? Thanks!

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  • Suggestions for making sysfs parameters persist across reboots

    - by ewwhite
    I'm experimenting with large changes to Linux system runtime parameters exposed through the sysfs virtual file system. What is the most efficient way to maintain these parameters so that they persist across reboots on a RHEL/CentOS-style system? Is it simply dumping commands into /etc/rc.local? Is there an init script that's well-suited for this? I'm also thinking about standardization from a configuration management perspective. Is there a clean sysfs equivalent to sysctl?

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  • Multiple Screens, Multiple OS

    - by Cenoc
    Hey, Around two days ago I saw someone working on a computer and alt-tabing to different OSs. Basically he had 3 "screens", one with Fedora, one with Windows XP, one with Mac OSX. How is that possible? I dont think it was a virtual machine.... sounds friggin awesome though.

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  • Remote access to internal machine (ssh port-forwarding)

    - by MacUsers
    I have a server (serv05) at work with a public ip, hosting two KVM guests - vtest1 & vtest2 - in two different private network - 192.168.122.0 & 192.168.100.0 - respectively, this way: [root@serv05 ~]# ip -o addr show | grep -w inet 1: lo inet 127.0.0.1/8 scope host lo 2: eth0 inet xxx.xxx.xx.197/24 brd xxx.xxx.xx.255 scope global eth0 4: virbr1 inet 192.168.100.1/24 brd 192.168.100.255 scope global virbr1 6: virbr0 inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 # [root@serv05 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr1 xxx.xxx.xx.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0 0.0.0.0 xxx.xxx.xx.62 0.0.0.0 UG 0 0 0 eth0 I've also setup IP FORWARDing and Masquerading this way: iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE iptables --append FORWARD --in-interface virbr0 -j ACCEPT All works up to this point. If I want to remote access vtest1 (or vtest2) first I ssh to serv05 and then from there ssh to vtest1. Is there a way to setup a port forwarding so that vtest1 can be accessed directly from the outside world? This is what I probably need to setup: external_ip (tcp port 4444) -> DNAT -> 192.168.122.50 (tcp port 22) I know it's easily do'able using a SOHO router but can't figure out how can I do that on a Linux box. Any help form you guys?? Cheers!! Update: 1 Now I've made ssh to listen to both of the ports: [root@serv05 ssh]# netstat -tulpn | grep ssh tcp 0 0 xxx.xxx.xx.197:22 0.0.0.0:* LISTEN 5092/sshd tcp 0 0 xxx.xxx.xx.197:4444 0.0.0.0:* LISTEN 5092/sshd and port 4444 is allowed in the iptables rules: [root@serv05 sysconfig]# grep 4444 iptables -A PREROUTING -i eth0 -p tcp -m tcp --dport 4444 -j DNAT --to-destination 192.168.122.50:22 -A INPUT -p tcp -m state --state NEW -m tcp --dport 4444 -j ACCEPT -A FORWARD -i eth0 -p tcp -m tcp --dport 4444 -j ACCEPT But I'm getting connection refused: maci:~ santa$ telnet serv05 4444 Trying xxx.xxx.xx.197... telnet: connect to address xxx.xxx.xx.197: Connection refused telnet: Unable to connect to remote host Any idea what's I'm still missing? Cheers!!

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  • sudo with -u via ssh -t in a crontab

    - by DJK_devel
    I'm trying to create a cron job that uses ssh to login to a remote server and run a script as a different user. I try: * * * * * source $HOME/.keychain/$HOST-sh && sudo -u $USER $PATH/$SCRIPT but this doesn't work because there is no -t option specified for ssh. The cron job needs to source the keychain file in order to work without a password, but I'm not sure where to include the -t option for ssh in this instance.

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  • Nginx https rewrite turns POST to GET

    - by x7311
    My proxy server runs on ip A and this is how people access my web service. The nginx configuration will redirect to a virtual machine on ip B. For the proxy server on IP A, I have this in my sites-available server { listen 443; ssl on; ssl_certificate nginx.pem; ssl_certificate_key nginx.key; client_max_body_size 200M; server_name localhost 127.0.0.1; server_name_in_redirect off; location / { proxy_pass http://10.10.0.59:80; proxy_redirect http://10.10.0.59:80/ /; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } server { listen 80; rewrite ^(.*) https://$http_host$1 permanent; server_name localhost 127.0.0.1; server_name_in_redirect off; location / { proxy_pass http://10.10.0.59:80; proxy_redirect http://10.10.0.59:80/ /; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } The proxy_redirect was taken from how do I get nginx to forward HTTP POST requests via rewrite? Everything that hits the public IP will hit 443 because of the rewrite. Internally, we are forwarding to 80 on the virtual machine. But when I run a python script such as the one below to test our configuration import requests data = {'username': '....', 'password': '.....'} url = 'http://IP_A/api/service/signup' res = requests.post(url, data=data, verify=False) print res print res.json print res.status_code print res.headers I am getting a 405 Method Not Allowed. In nginx we found that when it hit the internal server, the internal nginx was getting a GET request, even though in the original header we did a POST (this was shown in the Python script). So it seems like rewrite has problem. Any idea how to fix this? When I commented out the rewrite, it hits 80 for sure, and it went through. Since rewrite was able to talk to our internal server, so rewrite itself has no issue. It's just the rewrite dropped POST to GET. Thank you! (This will also be asked on Nginx forum because this is a critical blocker...)

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  • Monitor number of bytes transferred to/from IP address on port.

    - by Mike
    Can anyone recommend a linux command line tool to monitor the number of bytes transferred between the local server and a specified IP address/port. The equivalent tcpdump command would be: tcpdump -s 0 -i any -w mycapture.trc port 80 host google.com which outputs : 46 packets captured 131 packets received by filter 0 packets dropped by kernel I'd like something similar that outputs: 54 bytes out, 176 bytes in I'd like it to work on RHEL and be free/open-source. It would be good if there was an existing tool which I was just missing too!

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  • Exchange 2007 Receive E-Mail for other Domains

    - by Loop
    My organisation has Exchange 2007 e-mail server, and now, we want to host e-mail service for other organisation (neworg.com) I added new Authoritative Active Domain neworg.com, but when adding a new mailbox, there is no option to chose new SMTP domain name neworg.com, and I can't add new user with SMTP domain [email protected]. Probably I misunderstood something while reading posts on Internet, but can someone help please?

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  • Creating a Linux cluster/cloud to act as a server.

    - by Kavon Farvardin
    I have about four or five machines in the Pentium 3-4 era and I'm interested in creating a Linux server comprised of these machines. The server's main purposes would be to host several low-medium traffic websites/services (voice and game), and share terabytes of data on a local network. I could probably throw together one modern computer as a server and call it a day, but I'm interested in using these machines to do it instead. Where would I get started in this cluster/cloud setup?

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  • shell pipe behavior with MySQLDump

    - by unknown (google)
    I am using mysqldump for a large database (several GB) and import the result from a pipe, please see commands below, does it do incremental pipe, or wait until the first one finishes then import? is this a good way of importing large db across servers? I know you can export gz it, then pscp it then import. Quick alternative are welcome mysqldump -u root -ppass -q mydatabase | mysql -u root -ppass --host=xxx.xx.xxx.xx --port=3306 -C mydatabase

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  • SQL server in VMware

    - by UndertheFold
    Please provide your tips and best practices for virtualizing SQL Server in VMWare ESX I am interested in advanced configurations and settings. Please provide reasoning behind your recommendations Edit: Just to clarify, I already have over 70 Virtual SQL servers in separate clusters using an ISCSI equallogic San - What I am really looking for are those advanced configurations like: How you configured your disks / RDM's Do you make use of settings like Mem.ShareScanGHz - http://communities.vmware.com/thread/143828 - that are not well documented

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  • Does QEMU's performance (still) lag VirtualBox's and is there a way to improve it without kvm?

    - by Catskul
    I've noticed several articles that have claimed that QEMU is slower than VirtualBox (without hardware assistance) but several are years old, and the newest seemed to be from last year. Is it true that QEMU is slower than VirtualBox? If so why? Are there any tricks to close the performance gap? Some of my host systems do not have virtualization support so I'm especially interested in performance tips that work without the kernel module.

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  • Running Virtualbox as a Transparent Bridge

    - by Goats
    I am setting up Untangle in a Sun VirtualBox VM. I plan on using this machine as a transparent bridge to filter and monitor traffic on my network. I'm not sure how to configure the network adapters for the virtual machine under the Virtualbox's "Devices" menu so that it will function as a transparent bridge. I guess what I'm asking is, should both adapter 1 & 2 be set as Bridged adapters or what? Any help is greatly appreciated.

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  • Restoring MySQL dump - ERROR 2006 (HY000)

    - by matcheek
    I am just trying to restore a mysql dump. Below are the command and error message. Can anybody give me some clues how to approach this? 10:54:16 Restoring C:\Users\matcheek\Documents\dumps\Dump20120405-1.sql Running: mysql.exe "--defaults-extra-file="d:\temp\tmpbvhy4i.cnf" " --host=127.0.0.1 --user=root --port=3306 --default-character-set=utf8 --comments < "C:\\Users\\matcheek\\Documents\\dumps\\Dump20120405-1.sql" ERROR 2006 (HY000) at line 271: MySQL server has gone away

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  • Impossible to Remove FTDI driver / FTDI Enumeration on Windows 7

    - by Joe
    I have already read the : Is it possible to reset FTDI virtual com ports enumeration, we easily get hundreds of COM ports in production environment topics which was pretty interesting ! But I got a problem, apparently I can't delete the ftdi driver, so I can't use the previous conclusion of the topic... I'm really stuck and bored of this problem, my com port number is 132 ! Does someone have another solution ?

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  • Increase Linux screen resolution

    - by David Gard
    I'm running an install of CentOS 5.5 virtually and for some reason I only have 2 available screen resolutions - 800x600 and 640x480. Does anybody know how I can add some bigger resolutions? I've had a look in /etc/X11/xorg.conf and it is knows that the graphics card is virtual, but even listing the resolutions that I want fails. Here is the default screen section - Secton "Screen" Identifiew "Screen0" Device "Videocard0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection And here is what I tried adding to SubSection "Display" - Mode "1024x768" "1280x1024"

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  • WLAN adapter on Ubuntu Server inside Hyper-V

    - by Firefox333
    I need to set up an Ubuntu server as a router. However we need to make it wireless and wired. I need a WLAN adapter for the wireless part of the router. I get my Internet connection on my server through my wireless adapter from my host but it automatically sees it as an Ethernet adapter instead of as a wireless adapter. Is there any way of making a (virtual) wireless adapter on Ubuntu server 12.04 inside a hyper-v machine?

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  • In Windows 7, is there a way to know how much memory a service is using?

    - by tigrou
    In windows 7, is there a way (by using common interface or a custom utility) to know how much memory a specific windows service is using ? It seems most services are hosted by svchost.exe processes ( some svchosts.exe processes seems to host tons of services). While it is possible to know which services are hosted by a specific process, I found no way to get information about how much memory a service take.

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