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• Adding tail behaviour where enter adds blank lines to less

  - by gonvaled

  I love less, which I can use to follow logs with the +F flag (or the ShiftF hotkey), search forwards and backwards, and generally move freely through the document. But there is one thing missing in less: usually I am at the end of the file, and I want to see new things happening. In tail -f I would just hit enter several times, and new log lines would just appear clearly separated from old lines. Is it possible to add this to less? How?

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• Forward the Wan IP to another Wan IP without change the Source address

  - by user195410

  I have tried this case by using the NAT function in iptables but fail example. PC A IP is 1.1.1.1 (Win7) My Server IP is 2.2.2.2 (CentOS 6.2) target Server B is 3.3.3.3 (Windows server 2003) Flow: PC A WanIP -- My Server A -- Server B (WanIP) ----My iptables rules--------- iptables -t nat -A PREROUTING -d 2.2.2.2 -p tcp --dport 80 -j DNAT --to-destination 3.3.3.3:80 iptables -t nat -A POSTROUTING -d 2.2.2.2 -j MASQUERADE finally, i can access server B website by enter 2.2.2.2:80 but when i checked the access log at Server B i found it's source address had been changed to src:2.2.2.2 dst:3.3.3.3 please help me to do how to get the real address is src:1.1.1.1 dst:3.3.3.3

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• "postgres blocked for more than 120 seconds" - is my db still consistent?

  - by nn4l

  I am using an iscsi volume on an Open-E storage system for several virtual machines running on a XenServer host. Occasionally, when there is a very high disk I/O load on the virtual machines (and therefore also on the storage system), I got this error message on the vm consoles: [2594520.161701] INFO: task kjournald:117 blocked for more than 120 seconds. [2594520.161787] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2594520.162194] INFO: task flush-202:0:229 blocked for more than 120 seconds. [2594520.162274] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2594520.162801] INFO: task postgres:1567 blocked for more than 120 seconds. [2594520.162882] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. I understand this error message is caused by the kernel to inform that these processes haven't been run for 120 seconds, most likely because a disk access to the storage system has not yet been processed. But what is the effect on the processes. For example, will the postgres process eventually write its data when the storage system is idle again after a few minutes, so that all data is still consistent? Or will it abort the write, leaving some tables in an inconsistent state? I certainly expect that the former should be the case - if the disk access is slow, postgres (or any other affected process) should just wait as long as it takes. I can live with the application hanging for a few minutes. But if there is a chance for data corruption then any of these errors is really bad news. Please advise what to do here.

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• x11vnc is slow, but using only 10% of available bandwidth

  - by mmm

  I am using x11vnc over 15Mbit/s network with 20ms latency. When the screen is changing a lot x11vnc is slow - for example when I switch a tab in a browser, it takes almost two seconds until the view is fully redrawn. The strange thing is that max connection speed of x11vnc is even during slow redrawing only about 10% of the available bandwidth. Why is x11vnc not using available bandwidth to speed the redrawing up? For example scp is using 100% of available bandwidth without problems. How can I identify what is the bottleneck for x11vnc on my system? So far I think: 10% network usage = network is not a bottleneck fb read rate: 601 MB/sec = reading fb is not a bottleneck Any ideas how can I further profile x11vnc and find out what is causing a slowdown? For example is there any switch for x11vnc to show how much data it is handling and how long it takes to grab a screen, process and compress it and send it over the network?

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• USB To Serial under OpenSuse 11.3

  - by Exsisto

  I have a LogiLink USB-To-Serial adapter. This has the PL2303 chip inside. When I insert the device: [26064.927083] usb 7-1: new full speed USB device using uhci_hcd and address 9 [26065.076090] usb 7-1: New USB device found, idVendor=067b, idProduct=2303 [26065.076099] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [26065.076105] usb 7-1: Product: USB-Serial Controller [26065.076110] usb 7-1: Manufacturer: Prolific Technology Inc. [26065.079181] pl2303 7-1:1.0: pl2303 converter detected [26065.091296] usb 7-1: pl2303 converter now attached to ttyUSB0 So the device is recognized and the converter is attached to ttyUSB0. When I do screen /dev/ttyUSB0 9600 I get the error: bash: /dev/ttyUSB0: Permission denied So I went looking in the file permissions. ls -l from the /dev folder reports: crw-rw---- 1 root dialout 188, 0 2011-04-26 15:47 ttyUSB0 I added my user lars to the dialout group. When I use the commands groups under lars it shows that I'm in the group. Though I still recieve the permissions denied error, as lars, and as root. I'm trying to connect to a console cable to configure some Cisco switches. My OS is OpenSuse 11.3 x86_64 with kernel version 2.6.34.7-0.7-desktop.

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• How to get top command output to show rake arguments?

  - by wbharding

  In the past, all of our servers have automatically shown command arguments passed to rake when we view them in top. For example: But on this particular server, we get this instead (picture is top running, showing the rake command, but not showing any of the arguments that had been passed to rake): Both servers are running Ubuntu (though the server without rake commands is a newer flavor of ubuntu). Both run rake through ruby enterprise edition (as powered by rvm). Can't seem to find any documentation on how top chooses what to show in the "command" column, other than the obvious "more data/less data" toggle (all screenshots are shown with the extra data enabled. Anyone encountered anything similar to this?

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• IP route ppp0 + eth0 access to outside network

  - by Vitor

  I need some help in define a route I have two connections one from eth0 and other a ppp0 (a 3G card) Not having the ppp0 connection active my route table is: Destination Gateway Genmask Flags Metric Ref Use Iface default DD-WRT 0.0.0.0 UG 100 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0 I can access my webserver from an outside network through ethernet interface Than I have also my ppp0 3G connection active havig the following route table: D estination Gateway Genmask Flags Metric Ref Use Iface default 10.64.64.64 0.0.0.0 UG 0 0 0 ppp0 10.64.64.64 * 255.255.255.255 UH 0 0 0 ppp0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0 Now I only can access my webserver in outside networks through the IP of the 3G connection Note that my server is serving at 0.0.0.0 IP (to all interfaces) But I need to get access to webserver to both interfaces ethernet and 3G connection I only can have access to both connection in local network Any help to configure this network to have both interfaces with outside networks access is welcome Can anyone give me an example to configure this network with 2 gateways to give outside networks access One for IP 192.168.1.149 and other for the ppp0 IP 89.214.60.196 Tanks

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• Increasing resolution in FreeNX headless server

  - by syrenity

  Hi. I'm running a FreeNX server on headless CentOS machine, and the resolution seems to be locked on 800 x 600. I tried editing the xorg.conf file, but without success so far. Has anyone succeed of running the FreeNX remote under 1280 x 1024 resolution, and can post a working configuration? Thanks! P.S.: Here is the pastebin of my current xorg.cof file: http://pastie.org/835308

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• Preventing auto-restart of nautilus on gnome 2.28

  - by Ivan Vucica

  Cheers! I dislike disobedience from my system. When I want to explicitly kill Nautilus with kill or killall, I am no longer able to do so. Previously I could disable this erroneous behavior (which even Windows do not exhibit!) through gnome-session-properties, however, it is no longer possible to set the "restart style" there (or whatever it was called). What is nowadays the correct way to disable nautilus autorestart under gnome? Reasons: I'm writing a piece of software that's painting directly into X11 root window. Nautilus is interfering. Compiz has a wallpapers plugin which Nautilus is painting over.

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• What's an easy way to install a bunch of OSS apps in my home dir on my company's aging Redhat VNC servers?

  - by subopt

  My company's IT group doesn't want to install lots of common stuff on our VNC servers, which run RHEL 4. The list of stuff i want/need includes graphviz, midnight commander, various python libs, sqlite, netbeans, antlr, jdk1.6, etc. They've hobbled rpm somehow, so i can't do rpm --relocate. And i don't want the RHEL4 compatible revs of this stuff anyway. I've probably got the room to build all this stuff in my home dir, but i don't want to take forever tracking down dependencies. Looking for an easy way to get the apps/tools i need, and nothing (or very little) else. Any suggestions?

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• Limit rate of outgoing UDP packets per second

  - by tim82

  Hi, since Teamspeak version 3 sends lots of packets per user and our provider is getting problems with his infrastructure above 20.000 packets per second we have to limit it that our servers are not going to be shut down. Red a lot about iptables but was not able to find the right rules. Could you give me an advise how to manage that the server is not going to send more than 19k packets per seconds? We are running on debian 4 Thanks in Advance Tim

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• Looking for the best ec2 setup for 3 sites totaling in 1.5 mil in traffic monthly

  - by john h.

  I am looking to consolidate our current aws setup of 2 Large ubuntu ec2 servers and 2 large RDS server for our 3 websites that have a total of about 1.5 million hits a month and increasing every month with the majority of traffic (1 mil) to one forum site in the group and the rest of traffic to an ecommerce site and a small wordpress site. So here is my question/thought? Would it be better for us to combine the two ec2 large servers to just one and same with the 2 RDS servers so we run all three sites off one large ec2 and one RDS. -or- Should we setup maybe 2-3 smaller ec2 servers load balenced and a single RDS. -or- Something completely different setup? One concern is that if one site crashes it takes with it the others. It happened in the past but I am pretty sure its because of the forum software and not the server setup. -john

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• Where are ethernet errors logged?

  - by Matt

  Munin is showing me a graph like this: During that spike, I was unable to access my server through the eth0 port (I could access it through my IPMI port). I'm trying to figure out what happened, but I can't seem to locate any log files for eth0. I don't see anything in /var/log/(kern|syslog|messages) that is out of the ordinary. And I don't see a log file specifically for eth0. Are there logs for eth0, and if so, where can I find them? I am running Ubuntu 10.04 LTS.

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• LUN's are not getting mounted

  - by Nishant

  mount -t gfs /dev/vgglobal/lvol1 /packages mount: permission denied I am running as a root user and still getting this error . Any idea what could be the problem ?

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• Persuading openldap to work with SSL on Ubuntu with cn=config

  - by Roger

  I simply cannot get this (TLS connection to openldap) to work and would appreciate some assistance. I have a working openldap server on ubuntu 10.04 LTS, it is configured to use cn=config and most of the info I can find for TLS seems to use the older slapd.conf file :-( I've been largely following the instructions here https://help.ubuntu.com/10.04/serverguide/C/openldap-server.html plus stuff I've read here and elsewhere - which of course could be part of the problem as I don't totally understand all of this yet! I have created an ssl.ldif file as follows; dn:cn=config add: olcTLSCipherSuite olcTLSCipherSuite: TLSV1+RSA:!NULL add: olcTLSCRLCheck olcTLSCRLCheck: none add: olcTLSVerifyClient olcTLSVerifyClient: never add: olcTLSCACertificateFile olcTLSCACertificateFile: /etc/ssl/certs/ldap_cacert.pem add: olcTLSCertificateFile olcTLSCertificateFile: /etc/ssl/certs/my.domain.com_slapd_cert.pem add: olcTLSCertificateKeyFile olcTLSCertificateKeyFile: /etc/ssl/private/my.domain.com_slapd_key.pem and I import it using the following command line ldapmodify -x -D cn=admin,dc=mydomain,dc=com -W -f ssl.ldif I have edited /etc/default/slapd so that it has the following services line; SLAPD_SERVICES="ldap:/// ldapi:/// ldaps:///" And everytime I'm making a change, I'm restarting slapd with /etc/init.d/slapd restart The following command line to test out the non TLS connection works fine; ldapsearch -d 9 -D cn=admin,dc=mydomain,dc=com -w mypassword \ -b dc=mydomain,dc=com -H "ldap://mydomain.com" "cn=roger*" But when I switch to ldaps using this command line; ldapsearch -d 9 -D cn=admin,dc=mydomain,dc=com -w mypassword \ -b dc=mydomain,dc=com -H "ldaps://mydomain.com" "cn=roger*" This is what I get; ldap_url_parse_ext(ldaps://mydomain.com) ldap_create ldap_url_parse_ext(ldaps://mydomain.com:636/??base) ldap_sasl_bind ldap_send_initial_request ldap_new_connection 1 1 0 ldap_int_open_connection ldap_connect_to_host: TCP mydomain.com:636 ldap_new_socket: 3 ldap_prepare_socket: 3 ldap_connect_to_host: Trying 127.0.0.1:636 ldap_pvt_connect: fd: 3 tm: -1 async: 0 TLS: can't connect: A TLS packet with unexpected length was received.. ldap_err2string ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1) Now if I check netstat -al I can see; tcp 0 0 *:www *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 *:https *:* LISTEN tcp 0 0 *:ldaps *:* LISTEN tcp 0 0 *:ldap *:* LISTEN I'm not sure if this is significant as well ... I suspect it is; openssl s_client -connect mydomain.com:636 -showcerts CONNECTED(00000003) 916:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:188: I think I've made all my certificates etc OK and here are the results of some checks; If I do this; certtool -e --infile /etc/ssl/certs/ldap_cacert.pem I get Chain verification output: Verified. certtool -e --infile /etc/ssl/certs/mydomain.com_slapd_cert.pem Gives "certtool: the last certificate is not self signed" but it otherwise seems OK? Where have I gone wrong? Surely getting openldap to run securely on ubuntu should be easy and not require a degree in rocket science! Any ideas?

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• How to use Google Talk video chat on Redhat?

  - by eSKay

  Is there some way? This page says its not possible 'normally'. Is there a workaround for this?

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• time sync with ntpd

  - by guthrie

  I run Debian on several systems, and their times do not seem to stay in sync. I can run ntpdate manually, but I thought that I should have an ntpd running that would automate that. I did check with apt and apt-cache but don't find any ntpd (or associated ntpq), not any such names in my system (locate...), but ntp-doc does still describe them. Looking around I see that there is an ntpdate-debian command, and it uses /etc/default/ntpdate for servers (instead of the standard /etc/ntp.conf), but even thought that file is there and has "yes" indicated to use ntp.conf, it fails with "no servers can be used", although ntpdate works fine. Is this just a layer over ntpdate, any reason to use it instead? So, why are they missing, do I need them, how do I automate time updates? Associated, two of my machines are virtualized on a MSoft VM, how is it that their clocks drift, and both to different values? (The underlying Windows machine clock seems stable). I see a few old notes about time & ntp problems on VMware, didn't find anything either current or relating to MSoft VMs. Anything I did see says just to use ntpd, but as above, ...?!

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• Keeping new Ubuntu installation's /var on separate drive without formatting

  - by tlayton

  I have a server running an older version of Ubuntu and with /var stored on a separate partition on a separate hard drive. I am attempting to update Ubuntu to 10.04, but I still want to store /var on a separate partition and hard drive. However, I don't want to format the drive which currently contains /var, as it has important data. Is there some way to have 10.04 set up the new /var on this separate drive at installation, without formatting the drive and losing the old /var?

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• FileOp Failure on: /......./: Operation not permitted

  - by vipin sahu

  hi im using cpanel when i changes the foler permission i got this error please help FileOp Failure on: /home/public_html/components/com_openinviter: Operation not permitted Thanks

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• Can't SSH to remote server,how to avoid this

  - by snow8261

  From time to time,we suffer problems like we can not remote connect to our server via ssh.So we have to send someone on site to restart the computer for this problem.It causes a lot of pain.The situation is we have to remote connect to our server,which are very important like database server and application server and etc.We have met problems like ssh hang,like command ssh [email protected] with no response. when using ssh -v debug mode, it says : debug1: Connection established. debug1: identity file /.ssh/identity type -1 debug1: identity file /.ssh/id_rsa type -1 debug1: identity file /.ssh/id_dsa type -1 debug1: loaded 3 keys and we met this situation many times with no clue how to solve it.Is any log which can identify this problem? or Is there a tool for this problem? help needed!Any idea are appreciated.

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• Where to set catch-all address in Postfix (virtual mailboxes in affect)

  - by Cem

  I successfully configured Postfix to deliver messages to virtual mailboxes. I can set aliases and pipes inside /etc/postfix/virtual and mailboxes inside /etc/postfix/virtual_mailbox files. However, whenever I set a catch-all domain and point to a remote email address, it overrides all other virtual mailboxes and virtual aliases set in postfix. How can I set a catch-all forwarding to the remote email address when virtual mailbox is enabled? I set catch-all like this: @mydomain.com [email protected] Thanks for your help!

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• Find all duplicate files by md5 hash

  - by Jamie Curran

  I'm trying to find all duplicate files based upon md5 hash and ordered by file size. So far I have this: find . -type f -print0 | xargs -0 -I "{}" sh -c 'md5sum "{}" | cut -f1 -d " " | tr "\n" " "; du -h "{}"' | sort -h -k2 -r | uniq -w32 --all-repeated=separate The output of this is: 1832348bb0c3b0b8a637a3eaf13d9f22 4.0K ./picture.sh 1832348bb0c3b0b8a637a3eaf13d9f22 4.0K ./picture2.sh 1832348bb0c3b0b8a637a3eaf13d9f22 4.0K ./picture2.s d41d8cd98f00b204e9800998ecf8427e 0 ./test(1).log Is this the most efficient way?

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• List all symbolic links on a directory

  - by Mathias

  Hey, a short question: is it possible to list all symbolic links onto a directory other than running a find over the whole filesystem? Background: I have a directory containing a lot of different versions of a library and I'd like to do some cleanup work and delete the versions which weren't used in any projects. Thanks, Mathias

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• Elinks and flash

  - by bajki

  Hello everybody, is there a possibility to "use" flash based objects with elinks ? I mean, i have an online flash based multiplayer game ( http://haxball.appspot.com ) and i want to connect to game with elinks installed on my shell server to create an always-present game room. To do it, i need a terminal-based webbrowser with flash support. There is an elinks installed so it would be great if there is such a possibility in it. Any ideas? Thanks, Mike

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• Socat and rich terminals (with Ctrl+C/Ctrl+Z/Ctrl+D propagation)

  - by Vi

  socat - exec:'bash -li',pty,stderr,ctty - bash: no job control in this shell What options should I use to get fully fledged shell as I get with ssh/sshd? I want to be able to connect the shell to everything socat can handle (SOCKS 5, UDP, OpenSSL), but also to have a nice shell which correctly interprets all keys, various Ctrl+C/Ctrl+Z, tab completion, up/down keys (with remote history). Update: Found "setsid" socat option. It fixes "no job control". Now trying to fix Ctrl+D. Update 2: socat file:`tty`,raw,echo=0 exec:'bash -li',pty,stderr,setsid,sigint,sane. Not it handles Ctrl+D/Ctrl+Z/Ctrl+C well, I can start Vim inside it, remote history is OK.

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