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• Cannot dual boot Windows 7 after installing Linux Mint

  - by shva

  I first installed Windows 7. /dev/sda1 was the system reserved partition for Win 7, and /dev/sda2 was the C partition. Then I installed Linux Mint. After that, when I started the computer, I could see the "Windows 7 (/dev/sda1)" was listed in the end of boot menu, but I could boot into Windows 7. The only thing I can think of is I might make a mistake in choosing the place the grub was to be installed: I chose /dev/sda1 rather than /dev/sda by default. Can anyone provide any advice? Thanks so much!

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• Windows7 NFS with linux server

  - by Vitaly

  Hi. I have an Ubuntu server and want to access its web folder (/var/www). What I done: installed nfs-kernel-server, nfs-common and portmap (as in faq) Setted up /etc/exports: /var/www 192.168.1.0/255.255.255.0(rw,no_roow_squash,async,subtree_check) Then: sudo exportfs -ra Then: sudo /etc/init.d/nfs-kernle-server restart I checked, if all works on same machine: sudo 192.168.1.101:/var/www /mnt/test Then accessed /mnt/test and seen that all data present and all ok. Next, I tried to connect this folder to windows7 using NFS client: First, I checked, that linux exported path successfully: showmount -e 192.168.1.101 /var/www 192.168.1.0/255.255.255.0 All ok, go to mount: mount -o anon 192.168.1.101:/var/www z: Console said, that all success.. but. I cant access drive Z (drive exists in the system and point to right folder). When I try to access drive Z my Explorer just going to sleep and then say that timeout expired. Help me please.

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• Linux Flash Player with 2 Monitors: always full-screen on primary monitor

  - by CarlF

  My setup at home uses a laptop, with a larger external monitor in addition to the built-in LCD panel, which is primary. I can see the larger monitor from the rest of the room and use it as my TV, for playing DVDs and various types of web video. However, it isn't ideal for Flash video. For instance, if I watch a video from Hulu or any other Flash-based site, I can expand it to full-screen mode. However, no matter which monitor the browser window is on, the full-screen mode is always on the laptop LCD panel, which is both too small and not visible from most of the room. Does anyone know of a way to force the Flash video to play full-screen on the monitor I select instead of the primary? My video chipset is NVidia, using kernel 2.6.31 (Ubuntu). Thanks.

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• Linux - How to control Winbind Authentication cache timeout

  - by cybervedaa

  I have configured my linux machines (running CentOS 5.2) to authenticate against a Windows server running Active Directory. I have even enabled winbind offline logon. Everything works as expected, however I'm also looking to impose a TTL for the winbind authentication cache. So far all I found was the below snippet from the samba documentation winbind cache time (G) This parameter specifies the number of seconds the winbindd(8) daemon will cache user and group information before querying a Windows NT server again. **This does not apply to authentication requests**, these are always evaluated in real time unless the winbind offline logon option has been enabled. Default: winbind cache time = 300 Clearly the winbind cache time parameter does not control the cache TTL for authentication requests. Is there any other way I can implement a cache timeout for winbind authentication requests? Thank you

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• High CPU usage on Linux machine

  - by user305210

  I have a piece of java code running on two different machines, but on one of the linux machines, the code uses alot of CPU (close to 100% cpu usage). On the other machine the same code uses less cpu (under 3 to 4%). The machine where cpu usage is high, is a more powerful machine, more CPU and and more memory. This has started happening recently and performance on the machine with high cpu usage has degraded significantly. I am wondering if anyone has any ideas why something like this could happen, possible causes behind this etc. any guesses? No recent changes in hardware were made, no recent code updates... Thank you.

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• How to Set Linux Bonding Interface to Gigabit

  - by Kyle Brandt

  I have enabled Linux active backup mode bonding. Each interface is a gigabit interface, but the bond interface seems to end up at 100 Megabit: bonding: bond0: Warning: failed to get speed and duplex from eth1, assumed to be 100Mb/sec and Full. ... bnx2: eth0 NIC Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON ... bonding: bond0: backup interface eth1 is now up ethtool apparently can't provide info on bond: sudo ethtool bond0 Settings for bond0: No data available So does this mean I am operating at 100 or 1000 Megabit (My guess is 1000)? If it is only 100, what options in the ifcfg scripts or the modprobe bonding options do I need to sett to make it 1000?

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• System-install-packages missing in RedHat Enterprise Linux 5

  - by Kumar P

  i am using RedHat Enterprise Linux 5.1. When i use add-remove software in application menu, i think, that i wrongly uninstalled something. so after reboot that menu item missing. Also i can't use system-install-packages in terminal. When i double click rpm package it open as archive. And i specifically open it as software installer by open with other application, it saying error /usr/bin/system-install-packages missing. Help me to solve this problem ...

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• Ulimit settings in Oracle 11g on Linux 5

  - by Stuart

  Is there an issue with "Ulimit -Hn" being set too low (at 1024) when (Oracle recommend 65536)? This is for Oracle 64-bit 11g on Linux 5. It is one of the settings that appears to be woefully short of its recommendation. But I am also aware that the database server in question is an Oracle Data Guard Local Standby and should only really have a connection or two from its Primary database server (to ship the redo logs across). The Local Standby database server has 'hung' about 3 times in as many months and then requires a reboot. I do not have access to this server, so rely on others to look at logs etc. The sanity check on kernel params uncovered the low value for "ulimit -Hn". Has anyone ever seen that 'low' value cause a hang or crash?

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• httperrors for Linux

  - by Aaron McRuer

  I'm here because the Google has failed to get me what I need. I just recently graduated from university, and I'm working on a website. Back in college I used the school's web server for my projects, and there were a few tools that aided in the process. One was a Linux program/script/executable/prayer to the computing gods called "httperrors". You typed that into bash, and it would pop up any errors that would occur while running the web server. Specifically, if you had errors in your php code, it would tell you what was wrong. I guess it was a debugger of sorts. I can't find any such program's details online. Does this sound familiar to anyone?

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• Linux server remounted to read-only

  - by Eustahije

  I have tried to find anwser on SF, but no luck. Nothing worked. (and I have just basic knowledge of linux systems - I'm more developer) Hour ago I noticed that database is not reacting anymore. From some reason system went to readonly mode. Complete server is now, ofc, unavailable. Server is VPS in Dutch company, and have no idea what I can do with it now to unlock it. Every suggestion would be more then appriciated. I tried to save as much of database as possible but there are 20G of images, that would be hard to backup, but I can do that also, if that is something that is smart to do.

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• Ultra Low Latency Linux Distribution or Kernel

  - by Zanler

  I'd like to know if there are any linux distributions that are focused on low latency networking. The area I'm working in is algorithmic trading, and extremely low latency comms between machines is a must. The current h/w we're using is 10g ethernet, we're looking into things like infiniband RDMA and Voltaire VMA I've googled around, and have only been able to find tidbtits of kernel patches, command line options and hardware suggestions. I'm looking for a complete solution, specially built kernel, kernel bypass features, essentially all the goodies rolled up into one package - does such a thing even exist? I ask as a lot of this stuff seems to be a black art, people keep secret what they know works etc.

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• Ultra Low Latency Linux Distribution or Kernel

  - by Zanlor

  I'd like to know if there are any linux distributions that are focused on low latency networking. The area I'm working in is algorithmic trading, and extremely low latency comms between machines is a must. The current h/w we're using is 10g ethernet, we're looking into things like infiniband RDMA and Voltaire VMA I've googled around, and have only been able to find tidbtits of kernel patches, command line options and hardware suggestions. I'm looking for a complete solution, specially built kernel, kernel bypass features, essentially all the goodies rolled up into one package - does such a thing even exist? I ask as a lot of this stuff seems to be a black art, people keep secret what they know works etc.

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• Linux policy routing - packets not coming back

  - by Bugsik

  i am trying to set up policy routing on my home server. My network looks like this: Host routed VPN gateway Internet link through VPN 192.168.0.35/24 ---> 192.168.0.5/24 ---> 192.168.0.1 DSL router 10.200.2.235/22 .... .... 10.200.0.1 VPN server The traffic from 192.168.0.32/27 should be and is routed through VPN. I wanted to define some routing policies to route some traffic from 192.168.0.5 through VPN as well - for start - from user with uid 2000. Policy routing is done using iptables mark target and ip rule fwmark. The problem: When connecting using user 2000 from 192.168.0.5 tcpdump shows outgoing packets, but nothing comes back. Traffic from 192.168.0.35 works fine (here I am not using fwmark but src policy). Here is my VPN gateway setup: # uname -a Linux placebo 3.2.0-34-generic #53-Ubuntu SMP Thu Nov 15 10:49:02 UTC 2012 i686 i686 i386 GNU/Linux # iptables -V iptables v1.4.12 # ip -V ip utility, iproute2-ss111117 IPtables rules (all policies in table filter are ACCEPT) # iptables -t mangle -nvL Chain PREROUTING (policy ACCEPT 770K packets, 314M bytes) pkts bytes target prot opt in out source destination Chain INPUT (policy ACCEPT 767K packets, 312M bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 5520 packets, 1920K bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 782K packets, 901M bytes) pkts bytes target prot opt in out source destination 74 4707 MARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner UID match 2000 MARK set 0x3 Chain POSTROUTING (policy ACCEPT 788K packets, 903M bytes) pkts bytes target prot opt in out source destination # iptables -t nat -nvL Chain PREROUTING (policy ACCEPT 996 packets, 51172 bytes) pkts bytes target prot opt in out source destination Chain INPUT (policy ACCEPT 7 packets, 432 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 1364 packets, 112K bytes) pkts bytes target prot opt in out source destination Chain POSTROUTING (policy ACCEPT 2302 packets, 160K bytes) pkts bytes target prot opt in out source destination 119 7588 MASQUERADE all -- * vpn 0.0.0.0/0 0.0.0.0/0 Routing: # ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master lan state UNKNOWN qlen 1000 link/ether 00:40:63:f9:c3:8f brd ff:ff:ff:ff:ff:ff valid_lft forever preferred_lft forever 3: lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 00:40:63:f9:c3:8f brd ff:ff:ff:ff:ff:ff inet 192.168.0.5/24 brd 192.168.0.255 scope global lan inet6 fe80::240:63ff:fef9:c38f/64 scope link valid_lft forever preferred_lft forever 4: vpn: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 100 link/none inet 10.200.2.235/22 brd 10.200.3.255 scope global vpn # ip rule show 0: from all lookup local 32764: from all fwmark 0x3 lookup VPN 32765: from 192.168.0.32/27 lookup VPN 32766: from all lookup main 32767: from all lookup default # ip route show table VPN default via 10.200.0.1 dev vpn 10.200.0.0/22 dev vpn proto kernel scope link src 10.200.2.235 192.168.0.0/24 dev lan proto kernel scope link src 192.168.0.5 # ip route show default via 192.168.0.1 dev lan metric 100 10.200.0.0/22 dev vpn proto kernel scope link src 10.200.2.235 192.168.0.0/24 dev lan proto kernel scope link src 192.168.0.5 TCP dump showing no traffic coming back when connection is made from 192.168.0.5 user 2000 # tcpdump -i vpn tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on vpn, link-type RAW (Raw IP), capture size 65535 bytes ### Traffic from user 2000 on 192.168.0.5 ### 10:19:05.629985 IP 10.200.2.235.37291 > 10.100-78-194.akamai.com.http: Flags [S], seq 2868799562, win 14600, options [mss 1460,sackOK,TS val 6887764 ecr 0,nop,wscale 4], length 0 10:19:21.678001 IP 10.200.2.235.37291 > 10.100-78-194.akamai.com.http: Flags [S], seq 2868799562, win 14600, options [mss 1460,sackOK,TS val 6891776 ecr 0,nop,wscale 4], length 0 ### Traffic from 192.168.0.35 ### 10:23:12.066174 IP 10.200.2.235.49247 > 10.100-78-194.akamai.com.http: Flags [S], seq 2294159276, win 65535, options [mss 1460,nop,wscale 4,nop,nop,TS val 557451322 ecr 0,sackOK,eol], length 0 10:23:12.265640 IP 10.100-78-194.akamai.com.http > 10.200.2.235.49247: Flags [S.], seq 2521908813, ack 2294159277, win 14480, options [mss 1367,sackOK,TS val 388565772 ecr 557451322,nop,wscale 1], length 0 10:23:12.276573 IP 10.200.2.235.49247 > 10.100-78-194.akamai.com.http: Flags [.], ack 1, win 8214, options [nop,nop,TS val 557451534 ecr 388565772], length 0 10:23:12.293030 IP 10.200.2.235.49247 > 10.100-78-194.akamai.com.http: Flags [P.], seq 1:480, ack 1, win 8214, options [nop,nop,TS val 557451552 ecr 388565772], length 479 10:23:12.574773 IP 10.100-78-194.akamai.com.http > 10.200.2.235.49247: Flags [.], ack 480, win 7776, options [nop,nop,TS val 388566081 ecr 557451552], length 0

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• Creating windows links on Linux?

  - by Bart B

  I'm running a SAMBA file store for our Windows users, and I'd like to automatically generate windows LNK files linking to other network shares that the user needs access to. I've done quite a bit of googling and I can't find a way of creating windows links on Linux, or through Perl. I did find a perl module that looked promising in CPAN, but it will only run on Windows unfortunately. If it's not possible to create .LNK files, perhaps there is an alternative solution people can suggest to allow the users to click on a file in one SAMBA store to be linked to a different SAMBA share? Thanks, Bart.

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• Linux: find thin server running on port 80 and kill it

  - by Andrew

  On my Linux server I ran: sudo thin start -p 80 -d Now I'd like to restart the sever. The trouble is, I can't seem to get the old process to kill it. I tried: netstat -anp But what I see on port 80 is this: Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN - So, it didn't give me a PID to kill... I tried pgrep -l thin but that gave me nothing. Meanwhile pgrep -l ruby gives me like 6 processes running. I don't really understand why multiple ruby threads would be running, or which one I need to kill... How do I kill / restart the thin daemon?

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• Error during installation of Mesa on Linux

  - by rodnower

  Hello, I have a problem. I try to install Mesa 7.8 on CentOS 3.9 for i386 on VMVare 7.0.1 like described here: http://linux-sxs.org/multimedia/mesa.html When I perform configuration stage: ++++++++++++++++++++++++++++++++++++++++++++++++++ [root@CentOS Mesa-7.8]# ./configure --prefix=/usr --sysconfdir=/etc ++++++++++++++++++++++++++++++++++++++++++++++++++ (root is actualy root) This is what I get: ++++++++++++++++++++++++++++++++++++++++++++++++++ . . . checking pkg-config files for X11 are available... no checking for X... no configure: error: X11 development libraries needed for dri driver ++++++++++++++++++++++++++++++++++++++++++++++++++ (Three dots says that there is some output before) Put attention to error. Any idea? Thank you very much forahead.

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• Software RAID 10 on Linux

  - by vpetersson

  For a long time, I've been thinking about switching to RAID 10 on a few servers. Now that Ubuntu 10.04 LTS is live, it's time for an upgrade. The servers I'm using are HP Proliant ML115 (very good value). It has four internal 3.5" slots. I'm currently using one drive for the system and a RAID5 array (software) for the remaining three disks. The problem is that this creates a single-point-of-failure on the boot drive. Hence I'd like to switch to a RAID10 array, as it would give me both better I/O performance and more reliability. The problem is only that good controller cards that supports RAID10 (such as 3Ware) cost almost as much as the server itself. Moreover software-RAID10 does not seem to work very well with Grub. What is your advice? Should I just keep running RAID5? Have anyone been able to successfully install a software RAID10 without boot issues?

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• Linux certification

  - by nitins

  I have been working in Linux administration for 2.5 years. I would like to have a certification in this. Yes RHCE is an option. I think already know most of the RHCE stuff. But I would like to have some thing advanced. I ready to for a full time course as I not getting the exposure in my current company. Please give me suggestions about training/courses ? I find a couse RHCA(Architect). Need to know if this is good ?

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• Linux router and firewall with IP accounting

  - by Andrew

  I'm working on a project to replace my organisation's aging Slackware gateway/router/firewall machine in our colo rack. Previously we used rc.firewall but we are now looking for something more modern and easily configurable. The requirements are: Act as a gateway router & firewall Port forwarding to a Terminal Server in the colo IP/traffic accounting, preferably accessible via SNMP (already using cacti for other servers) Possibility of acting as a PPTP server & routing these connections Is not an out-of-the-box Cisco product (don't have the finances or support to maintain it) I'd prefer to use Ubuntu or some other Debian-based distro but something that integrates everything we're looking for is certainly an option if it offers all the desired features and is easy to configure. Is there a simple set of packages that will provide me with the Firewall & Accounting features, or am I best served with a custom-built distro / other solution?

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• Advice wanted on advanced Linux certification/courses including RHCA

  - by nitins

  I have been working in Linux administration for 2.5 years. I would like to have a certification in this. Yes RHCE is an option. I think I already know most of the RHCE stuff. But I would like to have something advanced. I am ready for a full time course as I am not getting the exposure in my current company. Please give me suggestions about training/courses. I have found a course called RHCA(Architect). Is this a good course?

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• Freebsd or Linux? as BGP router over 100mbps

  - by Yucong Sun

  I am building a server to act as a BGP border router for my 100mbps uplink in ISP. I needs these feature: 1) Dual stack BGP peering/routing (at least 100Mbps, maybe more). 2) Potential full internet BGP feed. 3) Some basic ACL functionality. The hardware is L3426/8G ram. NIC will be on-board dual port Broadcom 5716. I've worked with Linux extensively before and it seems to be able to handle 100mbps, but I heard FreeBSD is faster on networking stuff. Which one should I use? And do we have some performance benchmark numbers out there? Cheers.

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• Text Terminal Hardware (for Linux)

  - by DLH

  Is there any way to obtain a hardware text terminal (preferably small in size) with a screen and a keypad to connect to a Linux machine (preferably via usb)? I'd like to be able to log into a command line and do some work there while simultaneously running a graphical environment on the main display. It seems like there should be some kind of lcd screen and qwerty keypad device designed for this purpose. Does this exist, and how do I get one? Edit: I'd be happy with a small networked device as well, as long as I could get a remote terminal into my computer.

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• Linux HA - Best Heartbeat hardware solution

  - by Martino Dino

  Hi all I would ask anyone what is the best layer 2 medium for heartbeat in Linux and how it's best configured. More precisely I've been thinking about a dedicated NIC for that purpose but then i thought that if a switch breaks then i would loose the heartbeat connection for most of the cluster and STONITH 'BUM'!!! Will probably loose my job after :) Distributing the heartbeat onto the main NICs of every node trough a vif sounds reasonable but im not sure if this is the best option (at least the switches are redundant to some extent). Is it possible to use heartbeat over a bonded interface and that sounds reasonable? Do you have any other tip/solution for that issue?

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• Dumping a Linux console scrollback buffer?

  - by Gerald Combs

  We would like to save the output of a program run on a Linux console which spans many lines. Unfortunately it wasn't logged or run under screen, or any other way that lets us easily capture the output. The best method we've been able to come up with so far is: Log into the machine via a separate SSH session In the console session, page to the top of the buffer Repeat: In the SSH session, run "cat /dev/vcs >> screendump.txt" In the console session, page down one screen Dump the final screen in the SSH session Is there a better way? It seems like if the VC memory were contiguous and you knew where it was you could use dd to pull the console text directly out of kernel memory and into a file.

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• Unable to use NTFS partition for Dropbox in Linux

  - by Cristian

  Dropbox won't let me choose the sync folder inside a NTFS partition. First thought I had was mounting and its permissions (the Dropbox installer does let me choose my linux home as the Dropbox home). After searching and trying several other lines, the partition is mounted via fstab with these settings: /dev/sda5 /mnt/documents ntfs-3g uid=1000,gid=100,dmask=027,fmask=137 0 0 I can read and write in the partition, here is a ls output: 24 drwxr-x--- 1 tuxcayc users 24576 Sep 2 06:42 documents I'm using an Arch-based distro (Manjaro) and Dropbox installed via yaourt. I guess it's still some issue with mounting permissions. Any help is appreciated, Thanks.

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