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• Is it possible to install Ubuntu Server 10.04 *from* a USB drive?

  - by MousePad

  I've tried the Universal USB Installer from PenDrive, and put 10.04 Ubuntu Server on it. But when I boot up and try to install, it looks for a Ubuntu CD ROM, which I do not have. I thought the whole point is to be able to install from a USB, which seems easy with the Desktop version. Why is the server version not allowing me to do this? Am I missing something?

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• Sending mail results in "Sender address rejected: Domain not found"

  - by user1281413

  The setup: WHM/CPanel CentOS 5 server running Exim and Courier for mail services, and BIND for domain name services. I recently moved servers. The old server was running a HIGHLY similar configuration, and all accounts were ported via WHM. However, the server is unable to send, and sometimes receive email. Errors I am seeing (when I do get an error mail back) state: 450 4.1.8 : Sender address rejected: Domain not found Edit for clarity: this is the error response from remote mail servers. Numerous independent mail servers come back with the same error. (Email address is merely one valid example) My first instinct of course was to check the domain records. However, k-t.org appears to have a valid record (including an MX record), even after running it through domain checks on a completely different server elsewhere and online. Note that the issue appears to happen with all the domains hosted on the server, not just k-t.org I have also ensured that a PTR was created. My Googling has only lead me to people who had fairly basic DNS mistakes, but either I'm blind/dumb (possible, DNS is not my strong suite), or it's something that is a bit more archaic. I've run out of ideas, and I can't seem to find anything that could explain why servers are unable to resolve the domains. There doesn't seem to be anything missing or incorrect.

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• recovering a broken GNOME-desktop in debian wheezy

  - by morgon

  an hour ago I had a working gnome-desktop on my debian system (thinkpad x121e). Then I installed compiz that crashed. After a reboot the gnome-desktop no longer started. Then I did some upgrades with aptitude, all gnome-packages seem to be there, but it is still not working. On startup I get a login-dialog, when I login there is no desktop, only some window-manager running that allows me to start a terminal. When I run "gnome-session" I get the error message "failed to load session "gnome". So how do I get back to a working desktop? I have tried "tasksel install gnome-desktop --new-install" but that just displays a progress window that after half an hour still shows 0%. Can someone help me please? I have tried "

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• How to disable or tune filesystem cache sharing for OpenVZ?

  - by gertvdijk

  For OpenVZ, an example of container-based virtualization, it seems that host and all guests are sharing the filesystem cache. This sounds paradoxical when talking about virtualization, but this is actually a feature of OpenVZ. It makes sense too. Because only one kernel is running, it's possible to benefit from sharing the same pages of filesystem cache in memory. And while it sounds beneficial, I think a set up here actually suffers in performance from it. Here's why I think why: my machines aren't actually sharing any files on disk so I can't benefit from this feature in OpenVZ. Several OpenVZ machines are running MySQL with MyISAM tables. MyISAM relies on the system's filesystem cache for caching of data files, unlike InnoDB's buffer pool. Also some virtual machines are known to do heavy and large I/O operations on the same filesystem in the host. For example, when running cat *.MYD > /dev/null on some large database in one machine, I saw the filesystem cache lowering in another, monitored by htop. This essentially flushes all the useful filesystem cache in guests (FIFO) and so it flushes the MySQL caches in the guests. Now users are complaining that MySQL is very slow. And it is. Some simple SELECT queries take several seconds on times disk I/O is heavily used by other machines. So, simply put: Is there a way to avoid filesystem cache being wiped out by other virtual machines in container-based virtualization? Some thoughts: Choosing algorithm for flushing filesystem cache in the kernel. (possible? how?) Reserving a certain amount of pages for a single VM. (seems no option for filesystem cache type of pages that reading man vzctl) Will running MySQL on another filesystem get me anywhere? If not, I think my alternatives are: Use KVM for MySQL-MyISAM running VMs. KVM actually assigns memory to the VM and does not allow swapping out caches unless using a balloon driver. Move to InnoDB and tune the buffer pools, dirty pages, etc. This is now considered to be 'nice to have' on the long-term as not everyone responsible for administration of the system understands InnoDB. more suggestions welcome. System software: Proxmox (now 1.9, could be upgraded to 2.x). One big LV assigned for the VMs.

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• Download specific kernels for distros

  - by ant2009

  Hello, I am running CentOS 5.3. I am wondering where I can download the latest kernel for this distribution. I went to www.centos.org but could see any kernel download only the complete distribution is available to download. I just want the kernel. Kernels on the www.kernels.org are the vanilla kernels. I am wondering where to download for the specific distro? Many thanks for any advice,

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• Ubuntu terminal questions

  - by Camran

  I am wondering about my VPS providers ubuntu terminal. Are all these terminals the same? I think they are so user-UN-friendly. I can't copy-paste into the terminal, when I try opening textfiles, I can't scroll up and down easily. I cant save easily. Nothing is easy... Is it always like this with Ubuntu? Is there any way to make it easier? I use windows but I login to my vps provider with login details and then simply click "terminal" to open the terminal. Please help me out here

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• Linux Mint 14 disponible en Release Candidate, "Nadia" sort avec Nemo le fork de Nautilus, les bureaux Cinnamon 1.6 et Mate 1.4

  "Nadia" : Linux Mint 14 disponible en Release Candidate avec Nemo, le fork de Nautilus les bureaux Cinnamon 1.6 et Mate 1.4 [IMG]http://www.franck-depan.fr/images/logo/systemes-exploitation/linux/distribution-mint/mint-logo.png[/IMG] L'équipe de développement de GNU/Linux Mint annonce la Release Candidate de la quatorzième version de sa distribution fondée sur Ubuntu Voici une brève liste des nouveautés :Mate 1.4 Cinnamon 1.6 Mint Desktop Manager Software Manager améliorations système Mate 1.4 Mate 1.4 renforce non seulement la...

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• SELinux - Allow multiple services access to same /home/dir

  - by Mike Purcell

  I currently have SELinux enabled and have been able to configure apache to allow access to /home/src/web with a chcon command granting the 'httpd_sys_content_t' type. But now I am trying to serve the rsyslogd.conf file from the same directory, but every time I start rsyslogd I see an entry in my audit log saying that rsyslogd was denied access. My question is, is it possible to grant two applications the ability to access the same directory, while still keeping SELinux enabled? Current perms on /home/src: drwxr-xr-x. src src unconfined_u:object_r:httpd_sys_content_t:s0 src Audit log message: type=AVC msg=audit(1349113476.272:1154): avc: denied { search } for pid=9975 comm="rsyslogd" name="/" dev=dm-2 ino=2 scontext=unconfined_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:home_root_t:s0 tclass=dir type=SYSCALL msg=audit(1349113476.272:1154): arch=c000003e syscall=2 success=no exit=-13 a0=7f9ef0c027f5 a1=0 a2=1b6 a3=0 items=0 ppid=9974 pid=9975 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=30 comm="rsyslogd" exe="/sbin/rsyslogd" subj=unconfined_u:system_r:syslogd_t:s0 key=(null) -- Edit -- Came across this post, which is sort of what I am trying to accomplish. However when I viewed the list of allowed sebool params, the only relating to syslog was: syslogd_disable_trans (SELinux Service Protection), seems like I can maintain the current SELinux 'type' on the /home/src/ dir, but set the bool on syslogd_disable_trans to false. I wonder if there is a better approach?

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• SASL - Plaintext password not accepted - Encrypted works

  - by leviathanus

  I have a very strange issue! SASL does not work properly, as it does not accept plain-text passwords (like Outlook sends them) Oct 2 10:35:09 srf cyrus/imap[4119]: accepted connection Oct 2 10:35:09 srf cyrus/imap[4119]: badlogin: [217.XX.XXX.140] plaintext [email protected] SASL(-1): generic failure: checkpass failed Now I switch to "Encrypted password" in Thunderbird. I have the same issue as Outlook above on Thunderbird if I turn on "Plain Password"): Oct 2 10:40:40 srf cyrus/imap[14644]: accepted connection Oct 2 10:40:41 srf cyrus/imap[14622]: login: [217.XX.XXX.140] [email protected] CRAM-MD5 User logged in Same with Postfix: Without Oct 2 10:42:48 srf postfix/smtpd[17980]: connect from unknown[217.XX.XXX.140] Oct 2 10:42:48 srf postfix/smtpd[17980]: warning: SASL authentication failure: cannot connect to saslauthd server: Permission denied Oct 2 10:42:48 srf postfix/smtpd[17980]: warning: SASL authentication failure: Password verification failed Oct 2 10:42:48 srf postfix/smtpd[17980]: warning: unknown[217.XX.XXX.140]: SASL PLAIN authentication failed: generic failure With "Encrypted password": Oct 2 10:45:27 srf postfix/smtpd[21872]: connect from unknown[217.XX.XXX.140] Oct 2 10:45:28 srf postfix/smtpd[21872]: 50B3A332AAB: client=unknown[217.XX.XXX.140], sasl_method=CRAM-MD5, [email protected] Oct 2 10:45:28 srf postfix/cleanup[21899]: 50B3A332AAB: message-id=<[email protected]> Oct 2 10:45:28 srf postfix/qmgr[6181]: 50B3A332AAB: from=<[email protected]>, size=398, nrcpt=1 (queue active) Oct 2 10:45:28 srf postfix/smtpd[21872]: disconnect from unknown[217.XX.XXX.140] Config: /etc/imapd.conf:sasl_mech_list:LOGIN PLAIN CRAM-MD5 and /etc/postfix/sasl/smtpd.conf:mech_list: LOGIN PLAIN CRAM-MD5 I have no idea where to dig. Please advise.

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• Untangle VPN setup, how to see internal addresses?

  - by NFS user

  So Untangle is setup as the default gateway at 192.168.100.1/24, it is the authorative DHCP server issuing addresses from 192.168.100.100 to 192.168.100.200 and is successfully connected to the Internet. Untangle uses OpenVPN for remote access. Accessing the VPN gives me the address 192.168.40.5. However, I cannot ping any machines on the internal 192.168.100.x network remotely. Clearly, there is something basic that I am missing. What is it and how is it solved? Update: The VPN was not setup with the internal network. Since Untangle only allows editing the VPN setup once, the VPN had to be removed and reinstalled with the internal network exported. Now it works. The lesson is that the internal network must be setup before configuring the VPN.

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• Move Ubuntu to another drive

  - by Ben Dilts

  I have a laptop with an 80GB SSD and 500GB HDD. I currently have Windows installed on the SSD, and a 400GB data partition for Windows on the HDD. I set aside 100GB on the HDD to try out Ubuntu, and I'd like to make it my primary OS and switch it over to the (much) faster SSD. How could I go about getting my Ubuntu setup moved over to the SSD? I have a 120GB USB hard drive I can use if necessary for getting through it.

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• openvpn problem

  - by Jared Voronik

  I have a problem with openvpn. I have already setup openvpn sucessfully on some other servers in the past (basic configuration, nothing special). On this server, I used the same config file, but for setting up nat iptables -t nat -A POSTROUTING -s 10.4.0.0/24 -o eth0 -j MASQUERADE doesn't work. It gives error: iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?) Perhaps iptables or your kernel needs to be upgraded. How do I fix this error? Also, if I can't fix this error, can I do bridging instead of routing? I have only 1 interface, and I can connect to remote server only via ssh (and need to avoid reboots if at all possible) so if briding means a whole ethernet card has to be devoted to the openvpn (and no other servers) then briding is out, otherwise I can use briding. Do you know of a simple, step by step guide to configure openvpn briding (just simple openvpn server and clients that can access internet through vpn server, nothing fancy)?

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• Using nawk, how to print the first names for all those in the 916 area code? [closed]

  - by Steve

  Possible Duplicate: Using nawk, how to print all first names containing four characters? Using nawk, how to print the first names for all those in the 916 area code? I've tried nawk ‘$3 ~ /(916)/{print $1}’ inputfile but didn' work. Jody Savage:(206) 548-1278:15:188:150 Guy Quigley:(916) 343-6410:250:100:175 Dan Savage:(406) 298-7744:450:300:275 Nancy McNeil:(206) 548-1278:250:80:75 John Goldenrod:(916) 348-4278:250:100:175 Chet Main:(510) 548-5258:50:95:135

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• How to interpret IOZone results?

  - by homer5439

  Here are the resuts of running IOZone on an ext3 filesystem on an LVM volume residing on a SAN LUN (it was ran with 5 parallel processes). "Throughput report Y-axis is type of test X-axis is number of processes" "Record size = 4 Kbytes " "Output is in Kbytes/sec" " Initial write " 81628.55 " Rewrite " 83354.72 " Read " 115595.02 " Re-read " 119306.09 " Reverse Read " 47684.20 " Stride read " 10011.09 " Random read " 16751.27 " Mixed workload " 5659.77 " Random write " 1661.85 " Pwrite " 36030.83 Now this is all nice and dandy, but my question is: how do I know whether the values are as good as they could be or there is something to tweak (and if so, what?) The actual usage I will have for that Logical Volume is to act as virtual disk for a VM.

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• RPM with RHEL: install 2 version of same package / different arch

  - by Nicolas Tourneur

  I think the title is pretty self explanatory :) Is it possible, under RHEL (v 5) to install 2 instances of the same packages with 32 bit support for one and 64 bits support for the other one? Obviously, the running host has a 64 bit kernel and has the compatibility libraries required. (in this case, we would need a 64 bits JDK and a 32 bits one). If yes, are there any special rpm flag to use (change of installation directory for instance)? Thanks in advance,

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• What did Emolator do with My Laptop?

  - by Garry

  I played SEGA with my KEGA.exe (Sega Emulator) and it made my right key to be malfunctioned. Befor that day, I had played it, too in my notebook with fullscreen mode, and suddenly my ACER Aspire One notebook restarted during that emulator was running and before the screen was black (boot), my screen was blue with many words but I couldn't read them, but I remember that there was a word like 000000 x 0000000 x 000000 and bla bla bla. And when I played without fullscreen mode, It didn't happened but it made my right key to be malfunctioned until when I went to Bot setup, my right key doesn't work. Do U know what is the problem of my emulator? Can U explain me for that?

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• convert full-disk RAID5 array to partition-based array?

  - by Delan Azabani

  I have a RAID 5 array, md0, with three full-disk (non-partitioned) members, sdb, sdc, and sdd. My computer will hang during the AHCI BIOS if AHCI is enabled instead of IDE, if these drives are plugged in. I believe it may be because I'm using the whole disk, and the AHCI BIOS expects an MBR to be on the drive (I don't know why it would care). Is there a way to convert the array to use members sdb1, sdc1 and sdd1, partitioned MBR with 0xFD RAID partitions?

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• How to add delay in autologin

  - by raj

  I enabled autologin in my system (CentOS 6.2) for that I edited this file /etc/gdm/custom.conf In that I entered this code [daemon] AutomaticLoginEnable=true AutomaticLogin=test Here test means one account name, for that account autologin is working but the problem is not possible to logout. That is because everytime while I logout it will go to gdm(graphical display manager) and there it Again checks for account test. It is available right so it will again login to same account. Here I want add delay, that means it should wait for sometime, If no one login to any other account, then only test account will log. how to add delay?

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• a load balancing scenario using HAProxy and keepalived shows no performance advantage

  - by chakoshi

  Hi, I am trying to setup a load balanced web server scenario, using two HAproxy load balancers and two debian web servers following this guide http://www.howtoforge.com/setting-up-a-high-availability-load-balancer-with-haproxy-keepalived-on-debian-lenny. the setup is working but the results of simple performance benchmarking is not what I expected. I tried apache benchmark tool to send lots of requests to servers (one time directly testing one of the web servers and the other time testing through the load balancer) using the command "ab -n 1000000 -c 500 http://IP/index.html", but the test results shows better performance for the single server without load balancer. can any one tell me if I'm going wrong on some thing?

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• How can I prevent firefox from using bitmap fonts at certain zoom levels?

  - by Ryan Thompson

  In firefox 3.6 on Ubuntu 9.10, certain sites seem to use bitmap fonts for any fixed-width fonts, but only at specific zoom levels. This site and other stackexchange sites are among the affected sites, and of course the default zoom level is affected. At unaffected zoom levels, I get the expected smooth curvy fonts. How can I make firefox use the nice curvy smooth fonts at all zoom levels?

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• Where to download unix command?

  - by person

  I tried to run mvdir earlier and it said command not found. I then ran a search for it and still not found. Is there a place I can download the script for the command, and is there any information I should know post-download to get it to work?

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• How to run a program and get its PID in the background

  - by Ivan

  I have a Minecraft server startup script that looks like this: #!/bin/bash cd "$(dirname "$0")" exec java -Xmx4096M -Xms4096M -jar minecraft_server.jar How do I get java process's PID while being able to enter input into the Java process? if I change the exec line to exec java -Xmx4096M -Xms4096M -jar minecraft_server.jar & echo $! > pid it won't let me input any text into the Minecraft server java process.

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• CPU Affinity on ARM processors

  - by dsljanus

  I am using some RaspberryPI boards for a data acquisition system. They are nice boards, with plenty of community support around them, but they are really slow. I am thinking of gradually replacing them with ODROID multicore boards, with the Samsung Exynos processors. I have some experience using taskset to set CPU affinity on my servers because I am always running Node.js applications that are by definition single threaded. Now, is it possible to do this on an ARM board? I do not see why it would not in theory, but I have doubts over how well it is going to work. Does anyone have experience with this kind of hack? Also, I would appreciate any comments about ARM CPUs and how they differ from x86.

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• how to use iptables to block the IP of device connected to openwrt router

  - by scola

  I have two routers(A,B).the A connect to internet with IP:192.168.1.1 The openwrt router B connect the lan of A by bridge with static IP:192.168.1.111. I am learning to use iptables to control the devices connected to B(wlan) . I use my phone to connect wifi of B,the phone's IP is IP:192.168.1.100.it can surf the internet normally. I want to block the phone's IP to make the phone can not connect to internet. refer to http://bredsaal.dk/some-small-iptables-on-openwrt-tips iptables -A input_wan -s 192.168.1.100 --jump REJECT iptables -A forwarding_rule -d 192.168.1.100 --jump REJECT but it do not work.the phone still connect to internet normally. and I tried other chain(INPUT,OUTPUT,FORWARD).so many chains confused me. iptables -I OUTPUT -o br-lan -s 192.168.1.100 -j DROP and it do not work again. I'm sure that the iptables have no problem. root@OpenWrt:/etc# iptables -L|grep Chain Chain INPUT (policy ACCEPT) Chain FORWARD (policy DROP) Chain OUTPUT (policy ACCEPT) Chain forward (1 references) Chain forwarding_lan (1 references) Chain forwarding_rule (1 references) Chain forwarding_wan (1 references) Chain input (1 references) Chain input_lan (1 references) Chain input_rule (1 references) Chain input_wan (1 references) Chain output (1 references) root@OpenWrt:/etc# ifconfig br-lan Link encap:Ethernet HWaddr 0C:82:68:97:57:BA inet addr:192.168.1.111 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::e82:68ff:fe97:57ba/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14976 errors:0 dropped:0 overruns:0 frame:0 TX packets:7656 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2851980 (2.7 MiB) TX bytes:1902785 (1.8 MiB) eth0 Link encap:Ethernet HWaddr 0C:82:68:97:57:BA UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:58201 errors:0 dropped:11 overruns:0 frame:0 TX packets:45012 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:54591348 (52.0 MiB) TX bytes:5711142 (5.4 MiB) Interrupt:4 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:312 errors:0 dropped:0 overruns:0 frame:0 TX packets:312 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:39961 (39.0 KiB) TX bytes:39961 (39.0 KiB) mon.wlan0 Link encap:UNSPEC HWaddr 0C-82-68-97-57-BA-00-48-00-00-00-00-00-00-00-00 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4900 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:1223807 (1.1 MiB) TX bytes:0 (0.0 B) wlan0 Link encap:Ethernet HWaddr 0C:82:68:97:57:BA UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:37346 errors:0 dropped:0 overruns:0 frame:0 TX packets:49662 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:3808021 (3.6 MiB) TX bytes:54486310 (51.9 MiB) root@OpenWrt:/etc/config# cat network config 'interface' 'loopback' option 'ifname' 'lo' option 'proto' 'static' option 'ipaddr' '127.0.0.1' option 'netmask' '255.0.0.0' config 'interface' 'lan' option 'ifname' 'eth0' option 'type' 'bridge' option 'proto' 'static' option 'ipaddr' '192.168.1.111' option 'netmask' '255.255.255.0' option 'gateway' '192.168.1.1' option dns 192.168.1.1 and how to use iptables to control the network of wlan? Thanks in advance and sorry for poor English.

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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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