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  • Feeding the kernels entropy source from other machines and/or increasing its maximum size

    - by David Spillett
    We have has a little trouble with a small box that acts as a VPN end-point and mail relay for our network, caused by the available entropy for /dev/random being too low (which causes TLS connection attempts by exim to fail). The machine doesn't do anything else, so the normal feed into the entropy pool (interrupt timings from things like disk access) is not enough. As a quick hack I've set a looping script that reads from /dev/hda at a couple of Mbyte/sec which keeps it topped up. Other than buying a hardware RNG, is there a clean way of piping data for entry from elsewhere, such as a copy of the data our file server uses for its entropy source? I've spotted several tips for using rng-tools to feed it from /dev/urandom on the same machine but that "feels dirty". Also, is it possible to increase the maximum pool size? It currently seems to max out at 3585.

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  • sed comand - remove virus from wordpress [duplicate]

    - by EliaszKubala
    This question already has an answer here: How do I deal with a compromised server? 12 answers I have malicious code in every php file. This malicius code is auto paste at the beginning of file. I want to remove this with UNIX command from console. This is malicious code: <?php $guobywgpku = '..... u=$bhpegpvvmc-1; ?> I write this RegExp, "/<\?php \$guobywgpku.*\?>/m" and this RegExp work. I tested it here. The problem is, write command which remove this malicious code from every php file on the sever. Please Help me. Now i have something like this. sed "/<\?php \$guobywgpku.*\?>/m" index.php

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  • Using more recent kernel for Xen Dom0 in production.

    - by thelsdj
    Does anyone have experience running Xen dom0 on a more recent kernel than the stock 2.6.18? What host distro are you running? What release of Xen (or hg/git changeset)? What set of patches are you using on kernel source? (Has anyone got the pvops dom0 stuff working in production or is it better to stick with something like the SUSE patches? Any other tips and tricks to running a more recent kernel version as dom0 would be helpful.

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  • my.cnf in server directory, why

    - by Mellon
    On my Ubuntu machine, I have installed MySQL . I notice that there are /etc/my.cnf file which contain the content (only two lines): innodb_buffer_pool_size = 1G max_allowed_packet = 512M While there is also /etc/mysql/my.cnf with a long content like: # The MySQL database server configuration file. ... ... For me, it looks like both are configurations for MySQL server, but Why there are two my.cnf in different locations, can't the content to be merged to one my.cnf ? What is the purpose to have seperate my.cnf for MySQL server ?

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  • Processes spawned by taskset not respecting environment variables

    - by jonesy16
    I've run into an issue where an intel compiler generated program that I'm running with taskset has been putting its temporary files into the working directory instead of /tmp (defined by environment variable TMPDIR). If run by itself, it works correctly. If run with taskset (e.g. taskset -c 0 <program> Then it seems to completely ignore the TMPDIR environment variable. I then verified this by writing a quick bash script as follows: contents of test.sh: #!/bin/bash echo $TMPDIR When run by itself: $ export TMPDIR=/tmp $ test.sh /tmp When run through taskset: $ export TMPDIR=/tmp $ taskset -c 1 test.sh "" Another test. If I export the TMPDIR variable inside of my script and then use taskset to spawn a new process, it doesn't know about that variable: #!/bin/bash export TMPDIR=/tmp taskset -c 1 sh -c export When run, the list of exported variables does not include TMPDIR. It works correctly with any other exported environment variable. If i diff the output of: export and taskset -c 1 bash -c export Then I see that there are 4 changes. The taskset spawned export doesn't have LD_LIBRARY_PATH, NLSPATH (intel compiler variable), SHLVL is 3 instead of 1, and TMPDIR is missing. Can anyone tell me why?

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  • compressing dd backup on the fly

    - by Phil
    Maybe this will sound like dumb question but the way i'm trying to do it doesn't work. I'm on livecd, drive is unmounted, etc. When i do backup this way sudo dd if=/dev/sda2 of=/media/disk/sda2-backup-10august09.ext3 bs=64k ...normally it would work but i don't have enough space on external hd i'm copying to (it ALMOST fits into it). So I wanted to compress this way sudo dd if=/dev/sda2 | gzip > /media/disk/sda2-backup-10august09.gz ...but i got permissions denied. I don't understand.

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  • Sendmail is not ignoring MX lookups

    - by daniel
    Hello, I recently learned of the joys of square brackets with SMART_HOST to have sendmail ignore MX lookups. I need this functionality, however, I can't seem to make it persistant. Sending mail with -Am works, however, -bm does not. In the -Am case, the correct mail server is used. In the -bm case, an MX lookup is still being performed. Is there a way to disable MX lookups (or some working alternative)? Thanks

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  • Virtualbox - routing subnet to bridge adapters

    - by user42384
    Hello, I have set up a Debian Lenny box with 3 vbox Lenny machines running eth0 of the host in bridged mode (on virtualbox 3.1.6). When testing in my local LAN, this all worked perfectly well and traffic flowed to and from the IPs of the virtual machines as it should. However, now that it's in its co-lo home, the networking setup is a bit different, and I'm unable to get traffic to flow to the vboxes properly. Specifically, the host has its own Primary IP, and I have a separate subnet of 8 (6 usable) IPs routed to the box for use by the vboxes. So, eth0 on host is: Machine IP: 2x.x.x.137 Gateway IP: 2x.x.x.138 Subnet Msk: 255.255.255.252 Subnet for vboxes is Subnet: 2x.x.x.240/29 Netmask: 255.255.255.248 vbox1 is configured to 2x.x.x.241 on eth0 as follows: auto eth0 iface eth0 inet static address 2x.x.x.241 netmask 255.255.255.248 Setting up a virtual interface (eth0:0) on the host with one of these subnet IPs allows me to ping to that address only from vbox1, and it allows me to ping vbox1 from the host. I can also ping that virtual interface perfectly well from outside, so the IPs are definitely landing at my machine. It seems I'm missing some sort of routing instruction either on the host or vbox1 to get traffic moving between the subnet and the default gateway, but I can't seem to figure out what it should be, or what glaringly obvious thing i'm missing. Most of my obvious attempts (the gw of eth0, the ip of eth0) were rejected by route command with SIOCADDRT: No such device (eg - i can't find it). I tried setting vbox1 to bridge on eth0:0, but this was not an acceptable device name and VBoxHeadless refused to start. The physical machine does have an unused physical NIC at eth1 that can be used if necessary for something or other. Host machine is running iptables configured by ferm, have experimented with it allowing forwarding for that subnet, but I wouldn't have thought this was necessary given the nature of the virtualbox devices (nor did it actually work). Clearing out all of these rules for a blank iptables set does not resolve the issue. (you can see ferm generated iptables at http://codedumper.com/ojaze) Thanks for any help you can give... Patrick

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  • CHROOT for shell script testing

    - by Josh
    I am looking at setting up a shell script in order to properly document and automate the process I am using to setup a few servers we have. In order to test the shell script through its different stages I was thinking a CHROOT would be ideal, since I can wipe out the "virtual root" and create it on the fly. I have never used CHROOT before, however. I was just curious what are the exact steps I would need to follow to implement this process of creating a chroot (with the basic core functions that would be needed to install apache/php/etc.)? and then destroying it?

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  • Sendmail Alias for Nonlocal Email Account

    - by Mark Roddy
    I admin a server which is running a number of web applications for a software dev team (source control, bug tracking, etc). The server has sendmail running solely as a transport to the departmental email server over which I have no control. We have someone who is still in the department but no longer on the dev team so I need to configure the transport agent to redirect all outgoing email (which would be coming from these applications) to the person that has taken their place. I added an entry in /etc/aliases like such: [email protected]: [email protected] But when I run /etc/init.d/sendmail newaliases I get the following error: /etc/mail/aliases: line 32: [email protected]... cannot alias non-local names So clearly I'm doing something I shouldn't. Is there a way to get aliases to work with non-local names or alternatively is their a way to accomplish my goal of redirecting outgoing mail for this user to another one? Technical Specs if the matter: Ubuntu 6.06 sendmail 8.13 (ubuntu provided package)

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  • Installing qt headers and libraries

    - by ant2009
    Hello, Ubuntu 9.10 2.6.31-20-generic I am trying to install some software. When I do the ./configure. I get the following error: checking for Qt... configure: error: Qt (>= Qt 3.0.2) (headers and libraries) not found. Please check your installation! So I install the following package thinking this would solve the problem. sudo apt-get install libqt4-dev I was thinking that the libqt4-dev would install the headers and libraries. However, I am still getting the same problem. Any ideas? Many thanks,

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  • Mount "Macrium Reflect" on a partition, boot from there?

    - by b e
    Can Macrium's Reflect recovery CD be mounted/used with GRUB ? If the cd can be 'put' (loaded/mounted/...) in a partition, then the only disc needed would be the actual recovery disc, which could be on an external hard drive, or even on the same machine in another partition, thus allowing on to recover using only what's on the machine itself. I have WXPpro and Xubuntu8.04 double mounted, really happy with them together, use each right now to fix problems with the other when they come up. Also have a partition for the Reflect CD, but I just can't get it to load from Grub, which would be great... Thanks for any thoughts, probably someone has already done this I know !

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  • fstab and cifs mounting, possible to store authentication information outside of fstab?

    - by tj111
    I am currently using cifs to mount some network shares (that require authentication) in /etc/fstab. It works excellently, but I would like to move the authentication details (username/pass) outside of fstab and be able to chmod it 600 (as fstab can have issues if I were to change its permissions). I was wondering if it is possible to do this (many-user system, don't want these permissions to be viewable by all users). from: //server/foo/bar /mnt/bar cifs username=user,password=pass,r 0 0 to: //server/foo/bar /mnt/bar cifs <link to permissions>,r 0 0 (or something analogous to this). Thanks.

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  • How to interpret the contents of /proc/bus/pci/devices ?

    - by vivekian2
    The first few fields of 'cat /proc/bus/pci/devices' are understandable. Field 1 - BusDevFunc Field 2 - Vendor Id + Device Id Field 3 - Interrupt Line Field 4 - BAR 0 and the rest of the BAR registers (0 - 5) after that. After the BAR registers are printed out, what are the other fields? Specifically, what PCI configuration space registers(offsets) are printed out?

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  • Is it possible to open server ports on TUN devices?

    - by JosephH
    If I make a VPN connection to a server (say myvpn.com; assume this server is not behind any router/firewall) via a TUN device and open a port (say 5555), will someone else be able to connect to me via myvpn.com:5555? If not, is there a tunneling software that does exactly this in a transparent manner? i.e. run any TCP/UDP-based server instance behind a router without NAT using another remote server.

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  • /etc/exports file not read on boot

    - by netimen
    I added some entries into my /etc/exports file. But when I boot my system, the file is not read. I check it by sudo exportfs — it returns nothing (also I can't mount the exported folders on other systems). Then I run sudo expotfs -a and then again sudo exportfs — and now all my exported folders are listed (and now I can mount the exported folders on other systems). I'm running kubuntu 9.04 with 2.6.28-11-generic kernel

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  • How to access MySQL when I delete the root user on openSUSE 11?

    - by Negin Nicki
    Unfortunately I deleted MySQL users with the command delete from mysql.user and now I can't access MySQL. I tried looking at MySQL - ERROR 1045 - Access denied, but it is not proper for me because I don't have any user for MySQL. I uninstalled and reinstalled MySQL but I can't access MySQL. What should I do? I wanted to have phpMyAdmin without login and I ruined the whole thing. After uninstalling and having no result, I tried to delete the directories of MySQL and again installing them but again no result and now I have this error: Error 2002:can't connect to local mysql server through socket /var/lib/mysql/mysql.sock I don't have any user to reset the password of, but if I have by reinstalling which I don't know how to connect to MySQL. I tried MySQL -u root I tried MySQL I tried mysqld-safe and etc in the link

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  • Compiling LAMP from source - apache2 error “no MPM package installed”

    - by kenny99
    Hi, I've compiled LAMP from source on a Ubuntu VPS. I had to remove a previously installed version of Apache then I manually compiled all the packages, which seems to have worked up unto a point - however, when I try to run commands like "/etc/init.d/apache2 restart" I get the following error - No apache MPM package installed. I have installed mpm-prefork so I don't know why i'm getting this problem. My configure command is as follows: ./configure --enable-so --enable-modules=most --with-mpm=prefork I have deliberately not used apt-get to install anything and want to avoid this if possible. Anyone have any guidance on how to resolve this error? Thanks in advance

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  • SSH issues: Read from socket failed: Connection reset by peer

    - by nitins
    I compiled OpenSSH_6.6p1 on one of our server. I am able login via SSH to the upgraded server. But I am not able to connect to other servers running OpenSSH_6.6p1 or OpenSSH_5.8 from this. While connecting I am getting an error as below. Read from socket failed: Connection reset by peer On the destination server in the logs, I am seeing it as below. sshd: fatal: Read from socket failed: Connection reset by peer [preauth] I tried specifying the cipher_spec [ ssh -c aes128-ctr destination-server ] as mentioned in here and was able to connect. How can configure ssh to use the cipher by default? Why is the cipher required here?

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  • symlink and sudo executable

    - by CodeMedic
    If I have the below sudoers entry usera ALL=(userb) NOPASSWD: /home/userc/bin/executable-file usera ALL=(userb) NOPASSWD: /home/userc/bin/link-to-another-executable-file When I log-on as usera and try running the below commands, it works sudo -u userb /home/userc/bin/executable-file but NOT the one below. sudo -u userb /home/userc/bin/link-to-another-executable-file Sorry, user usera is not allowed to execute '/home/userc/bin/link-to-another-executable-file' as userb on hostname. Any ideas?

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  • Groups and Symlinks, is this safe?

    - by sjohns
    Hi, Im trying to serve similar content over two websites, but don't want to have 2 of each file, especially when they are growing. The basics, im running CentOS, with cPanel. Is it safe to do the following, I have folder downloads1 in /home/user1/www/downloads1/ i have user2, can i make a group - groupadd sharedfiles add both users to the group: useradd -g sharedfiles user1 useradd -g sharedfiles user2 then chown -r -v user1:sharedfiles downloads1/ User 2 i want to have /home/user2/www/downloads1 but i want it to be a symlink like ln "downloads1" "/home/user1/www/downloads1/" lrwxrwxrwx 1 user2 sharedfiles 11 May 9 14:20 downloads1 -> /home/user1/www/downloads1/ Is this a safe practice? Or is there a better way to do this if I want them both to be able to share the files for distribution over apache. Is there any drawbacks to this? Thanks in advance for any light shed on this. I'm not 100% sure weather this should have gone here or on serverfault.

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  • Groups and Symlinks, is this safe?

    - by sjohns
    Hi, Im trying to serve similar content over two websites, but don't want to have 2 of each file, especially when they are growing. The basics, im running CentOS, with cPanel. Is it safe to do the following, I have folder downloads1 in /home/user1/www/downloads1/ i have user2, can i make a group - groupadd sharedfiles add both users to the group: useradd -g sharedfiles user1 useradd -g sharedfiles user2 then chown -r -v user1:sharedfiles downloads1/ User 2 i want to have /home/user2/www/downloads1 but i want it to be a symlink like ln "downloads1" "/home/user1/www/downloads1/" lrwxrwxrwx 1 user2 sharedfiles 11 May 9 14:20 downloads1 -> /home/user1/www/downloads1/ Is this a safe practice? Or is there a better way to do this if I want them both to be able to share the files for distribution over apache. Is there any drawbacks to this? Thanks in advance for any light shed on this. I'm not 100% sure weather this should have gone here or on serverfault.

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  • Ubuntu Natty 11.04, Turning the wireless switch off; switches it off permanently!

    - by ZiGi
    i'm using an hp pavilion dv2000 i turned the wifi switch off by mistake, the LED turned orange and the wifi got disconnected. and now when i turn the switch on, it remains orange and the wifi still isn't functional. this happened before; i found a fix that worked searching google. it was done via terminal commands and i didn't have to download anything but i can't find the solution anymore! wlan0 shows up when i use: :~$iwconfig #BLA BLA BLA #... wlan0 IEEE 802.11abg ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=off Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off more results: :~$ sudo ifconfig wlan0 up SIOCSIFFLAGS: Operation not possible due to RF-kill :~$ rfkill list all 1: phy0: WirelessLAN Soft blocked: yes Hard blocked: yes :~$ sudo rfkill unblock all :~$ rfkill list all 1: phy0: WirelessLAN Soft blocked: no Hard blocked: yes :~$ sudo ifconfig wlan0 up SIOCSIFFLAGS: Operation not possible due to RF-kill it's still hard blocked! even though the switch is turned on; gives the same result eitherways a direction to a page with a working solution is a much appreciated answer!

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