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  • List of common ways those could shut down server unexpectedly ?

    - by SpawnCxy
    After running a bash fork bomb which made my webserver down, I think I should be more careful even not under root.I thought it would be totally fine while I'm not under root.So I ignored the warning and ran the bash fork bomb which is :() { :|:& }; : .(Please don't run it if u don't understand this code cuz it will make you system down).And I think I need a list of common ways those could cause a sever shutting down unexpectly even not under root. Any suggestion would be appreciated. Regards `

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  • SELinux vs. AppArmor vs. grsecurity

    - by Marco
    I have to set up a server that should be as secure as possible. Which security enhancement would you use and why, SELinux, AppArmor or grsecurity? Can you give me some tips, hints, pros/cons for those three? AFAIK: SELinux: most powerful but most complex AppArmor: simpler configuration / management than SELinux grsecurity: simple configuration due to auto training, more features than just access control

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  • Log - Server kernel: INFO: task httpd:000000 blocked for more than 120 seconds

    - by valter
    Almost everyday my server is crashing due to hight server load, and even restarting apache or mysql can't solve the problem. I need to reboot the server to solve, or it crash again due to the high load. The log system records something like this when it crashes: Aug 11 18:33:53 server kernel: INFO: task httpd:20008 blocked for more than 120 seconds. Aug 11 18:33:53 server kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 11 18:33:53 server kernel: httpd D ffffffff801538ac 0 20008 5816 20066 19809 (NOTLB) Aug 11 18:33:53 server kernel: ffff81025a299dc8 0000000000000082 ffff81033b4c0740 ffffffff80009a14 Aug 11 18:33:53 server kernel: ffff8101063f8d80 0000000000000009 ffff8100b758f7e0 ffff8101c57187e0 Aug 11 18:33:53 server kernel: 00009436d4100b6c 000000000001d50f ffff8100b758f9c8 000000083b531588 Aug 11 18:33:53 server kernel: Call Trace: Aug 11 18:33:53 server kernel: [<ffffffff80009a14>] __link_path_walk+0x173/0xfb9 Aug 11 18:33:53 server kernel: [<ffffffff8002cc16>] mntput_no_expire+0x19/0x89 Aug 11 18:33:53 server kernel: [<ffffffff80063c4f>] __mutex_lock_slowpath+0x60/0x9b Aug 11 18:33:53 server kernel: [<ffffffff80023908>] __path_lookup_intent_open+0x56/0x97 Aug 11 18:33:53 server kernel: [<ffffffff80063c99>] .text.lock.mutex+0xf/0x14 Aug 11 18:33:53 server kernel: [<ffffffff8001b21f>] open_namei+0xea/0x712 Aug 11 18:33:54 server kernel: [<ffffffff8002768a>] do_filp_open+0x1c/0x38 Aug 11 18:33:54 server kernel: Firewall: *UDP_IN Blocked* IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:30:48:9e:6e:99:08:00 SRC=208.43.135.158 DST=255.255.255.255 LEN=151 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=38354 DPT=6112 LEN=131 Aug 11 18:33:54 server kernel: [<ffffffff8001a061>] do_sys_open+0x44/0xbe Aug 11 18:33:54 server kernel: [<ffffffff8005d28d>] tracesys+0xd5/0xe0 I googled a lot trying to find a solution. But it looks that the solution is just to update the kernel or disk driver, thinks that I don't know how to do. In this url http://bugs.centos.org/view.php?id=4515 a lot o people report similar problems, except the fact that they are not related to httpd like mine. According to one member, one solution would be to add "elevator=noop " to /etc/grub.conf like in this example: title CentOS (2.6.18-238.12.1.el5xen) root (hd0,0) kernel /vmlinuz-2.6.18-238.12.1.el5xen ro root=/dev/VolGroup00/LogVol00 elevator=noop initrd /initrd-2.6.18-238.12.1.el5xen.img Would this really solve the problem? My disk are working in RAID. Can this cause some problem to my server? Is there any other solution?

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  • Permission denied error while import to remote repository via svn...

    - by Usman Ajmal
    Hi I am importing my project to another machine on my LAN to the directory: /srv/svn/repos/my-repo where my-repo was created via svnadmin create option The permissions of /srv/svn/repos/my-repo are drwxr-xr-x 6 svn svn 4096 2010-04-19 17:30 my-repo I executed following command to import myProject files to my-repo on remote system sudo svn import -m "First import" myProject svn+ssh://[email protected]/srv/svn/repos/my-repo This command started 'Adding' files but gave following error after 'Adding' 7 files svn: Can't open file '/srv/svn/repos/baltoros-valgrind/db/txn-current-lock': Permission denied Any idea whats going on...? Thanks a lot

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  • JBD: Spotted dirty metadata buffer

    - by Jake Mach
    Sep 25 22:19:38 host kernel: [7798806.146942] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 267). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.146956] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 1). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.146967] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 353). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.147121] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 353). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.147133] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 1). There's a risk of filesystem corruption in case of system crash. Sep 25 22:19:38 host kernel: [7798806.147143] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 267). There's a risk of filesystem corruption in case of system crash. [7817859.850517] EXT4-fs error (device loop0): ext4_mb_generate_buddy: EXT4-fs: group 1: 28618 blocks in bitmap, 29028 in gd what does this mean? how did this happen?

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  • Ubuntu 9.10 x86_32 with PAE causes graphics issues, mainly slowness

    - by widgisoft
    I've tried the 64bit version and found I was constantly hitting a brick wall trying to get 32bit stuff to run; I'd previously used PAE on 9.04 without any issues so figured I'd give it a shot. However, on 9.10 it seems PAE or the process of enabling PAE breaks the nvidia drivers/module somewhat as performance is terrible; I can't even enable desktop effects and there's lots of artifacting on random controls. Disabling the pae image and rebooting fixes the issue however I'm then stuck with "only" 2.7Gb of ram and unable to use the full 8gb that's installed. Is there somthing special I need to do when using pae and nVidia drivers or should I be using 64bit and just figure out how to force run 32bit packages? :-p

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  • How do I enable write access for an sFTP only user under Ubuntu?

    - by Jon Cage
    I'm running Ubuntu 12.04 and am trying to configure a user to allow chroot'd sFTP connections to another section of the filesystem. I've added the following to my /etc/ssh/sshd_config file: Match Group mygroup X11Forwarding no AllowTcpForwarding no ForceCommand internal-sftp ChrootDirectory /home/%u I've set their home directory so that it's owned by root but has their group. I've created a mount --bind from /home/myuser/transfers to /my/filesystem which appears to be navigable. The problem I'm having is that I'm not able to write to any part of the filesystem which makes this pretty useless as an FTP server. What am I missing? What can I check?

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  • How can I register a custom protocol with xdg ?

    - by julien
    I've been struggling this morning trying to associate an application with a custom protocol, namely emacsclient and org-protocol. I'm calling this protocol from a webbrowser bookmarklet, and I get the following behaviour : In chromium, the "Launch Application" dialog comes up, and calls xdg-open org-protocol://... which ends up firing a new chromium frame. In firefox, I've tried setting network.protocol-handler.app.org-protocol to an empty string or my emacsclient path, anyhow I get the following error message : "Firefox doesn't know how to open this address, because the protocol (org-protocol) isn't associated with any program" without even showing any external application selection dialog. I'm not using any desktop environment, so I need to make this work strictly with xdg, however, despite reading the shared mime info spec etc, I still can't fathom a working configuration.

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  • Windows clients not using NTP server provided via DHCP

    - by gencha
    I have a network consisting mostly of Windows Vista and 7 clients and an Ubuntu server. The server provides both the DHCP and NTP services through dhcp3-server and openntpd. In my dhcpd.conf, the subnet is declared as follows: subnet 10.10.10.0 netmask 255.255.255.0 { range 10.10.10.10 10.10.10.200; option broadcast-address 10.10.10.255; option routers 10.10.10.1; option ntp-servers 10.10.10.1; } The clients don't seem to be using the NTP server though. When I capture the network traffic with Wireshark during the DHCP process, I also see no mention of the NTP option in the DHCP offer message. I am not quite sure if the clients would have to specifically request that option to receive it or if I have to make another configuration to offer the option.

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  • VNC on Xen failure

    - by BCable
    The following config works and creates a good VM in Xen: # Kernel Setup kernel = "/boot/vmlinuz-2.6.18.8-xenU" # Memory memory = "256" # Disk disk = [ "file:/opt/xen/domains/110/sda1.img,sda1,w", "file:/opt/xen/domains/110/swap.img,sda2,w" ] # container name name = "110" hostname = "boo" # Networking vif = ["type=ieomu, bridge=xenbr0"] # VNC vnc = 1 #vfb = [ 'type=vnc,vncdisplay=2,vnclisten=0.0.0.0,vncpasswd=110' ] # Behavior Settings root = "/dev/sda1" extra = "fastboot" But when I uncomment the VFB line, I get the following error after it hangs for at least 30 seconds: [root@customer 110]# xm create boo.cfg Using config file "./boo.cfg". Error: Device 0 (vkbd) could not be connected. Hotplug scripts not working. Any ideas? Part two of this question: Sometimes it actually works, and a port is opened. When this happens, nmap shows the VNC ports open and I can connect via the VNC client, but it just hangs at "Connection established." and no VNC display shows up. I've tried multiple VNC clients (TightVNC, TightVNC Java Console, RealVNC), but they all fail to connect. Does VNC through Xen require X to be started in order to function? I was under the impression that it would show the console screen, so I'm confused as to why all these issues are occurring. Thanks!

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  • Command-line way to send keystrokes to a window open on a different X-session

    - by Sanjay Manohar
    I have a Ubuntu desktop open and logged on, on my main machine. I am then also logging in to this machine from a remote computer, using X2go which creates a new X-session. I have a libreoffice file open on the original session. I want to save this file and close it - but from the remote machine! (Both sessions have same user logged in; I can sudo if needed) I have tried using xdotool search but this fails to find the window. Is there a way to do what I want from this second session? I can see the process with ps -A I can even see the open file with lsof! How can I do a "save-and-close" on it?

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  • Sharing hp Deskjet F380 using cups via http driver issues with xp client

    - by ageis23
    Hi the problem is xp doesn't have built in drivers for my printer but vista does. On vista it works perfectly without any issues. However when I try using xp, it insists that I select a driver from the selection xp offers by default. The drivers I've downloaded from HP don't support networking. Hp have stated they're non networkable. Is there anything I can do about this? Any help is greatly appreciated and would save me getting ear ache!

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  • Problems with Xen installation

    - by Rodnower
    Hello, I have CentOS 5.4 installed. Now I'm trying to install Xen with out connecting to Internet (I have any driver for modem, so I search on Inernet only from Windows). All I have are 7 installation disks. First I done was to find kind of some add/remove programs wizard but it needed connection to Inernet. Second I try was to find Xen rpm on all disks and install it. But I fell on some dependency of some dependency. Third I attempted was to boot from first disk and do upgrade, but also it was unsuccessfully... So my question is: is there some way to install Xen from CentOS installation disks with out network? Thank you for ahead.

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  • What do I need to do to set my computer as Default Gateway?

    - by Vaibhav
    We are trying to put together a box with dual LAN cards (let's say Outer and Inner), where the Inner LAN card is supposed to act as a default gateway on the network it is connected to. This box is running Ubuntu. The basic purpose for this box is to take messages generated on the inner network, do some work with them and forward them out the Outer LAN card to a server. The inner network is completely isolated with simply a regular switch connecting the Inner LAN Card with two other boxes. These other boxes either throw out multi-cast messages (which the Inner LAN Card is listening to), or send out unicast messages meant for the server which is not on this inner network. So, we need the Inner LAN Card to act as a default gateway, where these unicast messages will then be sent, and the code on the dual-LAN Card box can then intercept and forward these messages to the server. Question: 1. How do we setup the LAN Card to be default gateway (does it need some configuration on Ubuntu)? 2. Once we have this setup, is it a simple matter of listening to the interface to intercept the incoming messages? Any help (pointers in the right direction) is appreciated. Thanks.

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  • Apache2: Trying to map a subdomain to a subdirectory

    - by user1561753
    So basically I want to have: sub.domain.com/anything - domain.com/asub/anything I'm a bit new to this and a bit confused. The first thing I did was configure my DNS settings so sub.domain.com goes to domain.com using a CNAME (would an A record and the IP be better?) Next I went into my VirtualHost file and have: RewriteEngine on RewriteCond %{HTTP_HOST} www.(.+) [NC] RewriteRule ^/(.*) http://domain.com/$1 [R] RewriteCond %{HTTP_HOST} ^sub.domain.com RewriteRule ^/(.*) http://domain.com/asub/$1 [R] So the first rule is meant to handle www. and making sure that is caught correctly and it works. The second rule is what I've added for the subdomain mapping and it doesn't seem to be doing anything

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  • Start multiple instances of Firefox; Xephyr rootless mode

    - by Vi
    How can I have multiple independent instances of Mozilla Firefox 3.5 on the same X server, but started from different user accounts (consequently, different profiles)? Limited success was only with Xephyr :1, DISPLAY=:1 /usr/local/bin/firefox, but Xephyr has no Cygwin/X's "rootless" mode so it's not comfortable. The idea is to have one Firefox instance for various "Serious Business" things and the other for regular browsing with dozens of add-ons securely isolated.

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  • Use netcat as a proxy to log traffic

    - by deephacks
    I want to use netcat as a proxy to log http requests and responses to files, then tail these to inspect traffic. Think wireshark. Tried the following where 'fifo' is a named pipe, 'in' and 'out' are files, netcat proxy on port 8080, server on port 8081. while true; do cat fifo | nc -l -p 8080 | tee -a in | nc localhost 8081 | tee -a out 1fifo; done Problems: Netcat stop responing after first request (while loop ignored?). Netcat fails with msg localhost [127.0.0.1] 8081 (tproxy) : Connection refused if server unavailable on 8081. Question: Is it possible to "lazily" connect to 8081 when request is made? I.e. I do not want to have 8081 running when netcat is started.

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  • Apache - how to serve from a directory inside home folder, whereas home folder doesn't has any publi

    - by Vikrant Chaudhary
    Hi, I'm using Apache2 for completely local development purposes. I'm trying to make DocumentRoot to be /home/vikrant/www/ whereas permissions of /home/vikrant/ are 700. I'm getting 403 Forbidden when DocumentRoot is /home/vikrant/www/ however It Works! when DocumentRoot is /var/www/. I've even changed permissions of /home/vikrant/www/ to 777 and changed owner and group to www-data. Is it possible to serve from home directory whereas home directory doesn't has public permissions? If yes, then how?

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  • hosts file seems to be ignored

    - by z4y4ts
    I have almost fresh Ubuntu desktop box. OS was installed two weeks ago and updated from karmic repositories. Last week I had no problems with DNS. But this week something had changed. I'm not sure what and when, and not sure whether I changed any configs. So now I have some really weird situation. According to logs name resolving should work normally. /etc/hosts 127.0.0.1 localhost test 127.0.1.1 desktop /etc/host.conf order hosts,bind multi on /etc/resolv.conf # Generated by NetworkManager search search servers obtained via DHCP nameserver 192.168.0.3 /etc/nsswitch.conf passwd: compat group: compat shadow: compat hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis But if fact it is not. user@test ~ping test PING localhost (127.0.0.1) 56(84) bytes of data. [skip] Pinging is ok. user@test ~host test test.mydomain.com has address xx.xxx.161.201 But pure I suspect that NetworkManager might cause this misbehavior, but don't know where to start to check it. Any thoughts, suggestions?

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  • Ubuntu Device-mapper seems to be invincible!

    - by Andrew Bolster
    I'm working on a hopefully unrelated question question and I've got to a strange situation. First: I know very little about the very low level hardware kernal storage driver magix, so I'm hoping a) someone can help and b) someone can explain it to me better. I've been trying a dozen different configurations of my 2x500GB SATA drives over the past few hours involving switching between ACHI/IDE/RAID in my bios; After each attempt I've reset the bios option, booted into a live CD, deleting partitions and rewriting partition tables left on the drives. Now, however, I've been sitting with a /dev/mapper/nvidia_XXXXXXX1 that seems to be impossible to kill! its the only 'partition' that i see in the Ubuntu install (but I can see the others in parted) but it is only the size of one of the drives, and I know I did not set any RAID levels other than RAID0. Anyone have any ideas how I can kill this and get back to just two independent IDE drives? Or can anyone convince me of a reason to go the AHCI route? Many thanks in advance.

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