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• Cloudera Manager CDH5 - Installation Failure on Oozie Database

  - by Nerrve

  While doing the installation, i keep getting a failure on the step "Creating Oozie database" java.lang.Exception: DB schema exists at org.apache.oozie.tools.OozieDBCLI.validateDBSchema(OozieDBCLI.java:877) at org.apache.oozie.tools.OozieDBCLI.createDB(OozieDBCLI.java:184) at org.apache.oozie.tools.OozieDBCLI.run(OozieDBCLI.java:127) at org.apache.oozie.tools.OozieDBCLI.main(OozieDBCLI.java:78) How do i fix this? Where do i get the password/username/dbname for the PostgreSQL database to drop the existing schema? I tried cat /etc/cloudera-scm-server/db*.properties | grep pass and /var/lib/cloudera-scm-server-db/data/generated-password.txt but the passwords don't work!

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• conversion of a VMDK image with qemu-img failed with "error while reading sector 131072: Invalid argument"

  - by Erik Sjölund

  I tried to convert a VMDK image found in a OVA file to the QCOW2 format with the qemu-img command but it failed with the error message qemu-img: error while reading sector 131072: Invalid argument user@ubuntu:/tmp$ wget ftp://ftp.sanger.ac.uk/pub/databases/Pfam/vm/PfamWeb_20120124.ova user@ubuntu:/tmp$ tar xfv PfamWeb_20120124.ova PfamWeb_20120124_2.ovf PfamWeb_20120124_2.mf PfamWeb_20120124_2-disk1.vmdk user@ubuntu:/tmp$ qemu-img convert -O qcow2 PfamWeb_20120124_2-disk1.vmdk PfamWeb_20120124_2.qcow2 qemu-img: error while reading sector 131072: Invalid argument user@ubuntu:/tmp$ qemu-img --version | grep "qemu-img version" qemu-img version 1.0, Copyright (c) 2004-2008 Fabrice Bellard user@ubuntu:/tmp$ dpkg-query -f='${Version}\n' --show qemu-utils 1.0+noroms-0ubuntu14.1 user@ubuntu:/tmp$ cat /etc/issue Ubuntu 12.04.1 LTS \n \l How do I avoid the error?

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• Why is gcc failing with "unrecognized command line option "-L/lusr/opt/mpfr-2.4.2/lib" "?

  - by Mike

  My sysadmin recently installed a new version of GCC, in /lusr/opt/gcc-4.4.3. I tested it as follows: mike@canon:~$ cat test.c int main(){ return 0; } mike@canon:~$ gcc test.c /lusr/opt/gcc-4.4.3/libexec/gcc/i686-pc-linux-gnu/4.4.3/cc1: error while loading shared libraries: libmpfr.so.1: cannot open shared object file: No such file or directory After informing my sysadmin about this, he said to add /lusr/opt/mpfr-2.4.2/lib:/lusr/opt/gmp-4.3.2/lib to my LD_LIBRARY_PATH. After doing this, I get the following error: mike@canon:~$ gcc test.c cc1: error: unrecognized command line option "-L/lusr/opt/mpfr-2.4.2/lib" First, my sysadmin wasn't entirely sure this was the best workaround(though he did say it worked for him...), so is there a better solution? Second, why am I getting a linker error from cc, and how can I fix it? Some information which may be helpful: mike@canon:~$ env | grep mpfr OLDPWD=/lusr/opt/mpfr-2.4.2/lib LD_LIBRARY_PATH=/lusr/opt/mpfr-2.4.2/lib:/lusr/opt/gmp-4.3.2/lib: mike@canon:~$ echo $LDFLAGS (the above is a blank line)

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• Problem starting Glassfish on a VPS

  - by Raydon

  I am attempting to install Glassfishv3 on my Ubuntu (8.04) VPS using Java 1.6. I initially tried starting the server using: asadmin start-domain and received the following error message: JVM failed to start: com.sun.enterprise.admin.launcher.GFLauncherException: The server exited prematurely with exit code 1. Before it died, it produced the following output: Error occurred during initialization of VM Could not reserve enough space for object heap Command start-domain failed. I attempted to run it again and received a different message: Waiting for DAS to start Error starting domain: domain1. The server exited prematurely with exit code 1. Before it died, it produced the following output: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. Command start-domain failed. If I run cat /proc/meminfo I get the following (all other values are 0kB): MemTotal: 1310720 kB MemFree: 1150668 kB LowTotal: 1310720 kB LowFree: 1150668 kB I have checked the contents of glassfish/glassfish/domains/domain1/config/domain.xml and the JVM setting is: -Xmx512m Any help on resolving this problem would be appreciated.

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• Conky truncates text loaded from file

  - by takeshin

  I'm trying to configure conky on Ubuntu, because I need to display my todo list on the desktop. The the file is displayed, but the text is truncated (not rectangular, just after some character limit). How to display the whole file? Here is my setup: # Text alignment, other possible values are commented alignment top_right # Gap between borders of screen and text gap_x 10 gap_y 10 # Maximum size of buffer for user text, i.e. below TEXT line. max_user_text 16384 # stuff after 'TEXT' will be formatted on screen TEXT ${execi 30 cat /home/user/Documents/todo.txt}

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• Parallel Desktops: installing Parallel Tools on Ubuntu

  - by Patrick

  hi, I get the following error when I try to install Parallel Tools on my Ubuntu in Parallel Desktop. I follow the istructions, running sh install from terminal: I follow the UI istructions and then the installation stops with this error message: E: Couldn't find package dkms Fri May 7 14:34:20 PDT 2010 Start installation or upgrade of Guest Tools Installed Guest Tools were not found Perform installation into the /usr/lib/parallels-tools directory cat: /usr/lib/parallels-tools/kmods/../version: No such file or directory Start installation of prl_eth kernel module make: Entering directory `/usr/lib/parallels-tools/kmods' cd prl_eth/pvmnet && make make[1]: Entering directory `/usr/lib/parallels-tools/kmods/prl_eth/pvmnet' make -C /lib/modules/2.6.32-21-generic/build M=/usr/lib/parallels-tools/kmods/prl_eth/pvmnet make[2]: Entering directory `/usr/src/linux-headers-2.6.32-21-generic' LD /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/built-in.o CC [M] /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/pvmnet.o LD [M] /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/prl_eth.o Building modules, stage 2. MODPOST 1 modules WARNING: modpost: missing MODULE_LICENSE() in /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/prl_eth.o thanks

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• Most basic, low power home surveillance system

  - by cbp

  I am thinking of setting up a simple but effective surveillance system for my house that is: Very low powered (preferably no PCs left running out of stand-by mode) Cheap. When motion (or sound) is detected, I would like it to: Send an email/phone alert to me Record and upload video to the web (in case they steal the camera) So I imagine a system where I leave a netbook PC in stand-by mode and have it woken up by a motion detector. This initiates software to send alerts and periodically upload recorded video to the web. The software part is easy for me, but I'm not really a gadget-man so I'd like some advice on using a motion sensor of some sort to wake up the PC. Does anyone have some good advice? I know there are a couple of questions dealing with this topic already (see here: http://superuser.com/questions/3054/looking-for-a-moderately-priced-home-surveillance-setup, and here: http://superuser.com/questions/2929/can-you-suggest-a-great-home-security-setup-anti-burglars-e-t-c) - I am seeking more specific information with this question.

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• Linux equivalent to Mac OS X's fs_usage

  - by Khai

  Is there a Linux equivalent to the Mac OS X command fs_usage? According to the man page it does the following: "report system calls and page faults related to filesystem activity in real-time". I suppose one option would be to use strace and filter the data, however the fs_usage command allows all the processes running on the system to be "traced" at the same time. Here's an example output: 03:44:25 stat64 erences/ByHost/org.mozilla.firefox.69AC0B48-F675-5045-B873-A28B119C33E7.plist 0.000029 firefox 03:44:25 stat64 /Users/**********/Library/Preferences 0.000011 firefox 03:44:25 statfs64 /Users/**********/Library/Preferences 0.000004 firefox 03:44:25 open /Users/**********/Library/Preferences/org.mozilla.firefox.plist.lockfile 0.000090 firefox 03:44:25 stat64 /Users/**********/Library/Preferences/org.mozilla.firefox.plist 0.000004 firefox 03:44:25 stat64 /Users/**********/Library/Preferences 0.000002 firefox 03:44:25 open /Users/**********/Library/Preferences/org.mozilla.firefox.plist.vjLkANe 0.000100 firefox Any ideas?

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• How to install nginx and install the configuration files too

  - by Burning the Codeigniter

  I've just completely uninstalled nginx 1.0.6 from my server (Ubuntu 11.04) using apt-get remove nginx rm -rf /etc/nginx/ rm -rf /usr/sbin/nginx rm /usr/share/man/man1/nginx.1.gz apt-get remove nginx* Now I want to install it again, however when starting nginx, I get errors such as: Restarting nginx: nginx: [emerg] open() "/etc/nginx/nginx.conf" failed (2: No such file or directory) Then I placed my own conf file, then I get a new error: Restarting nginx: nginx: [emerg] open() "/etc/nginx/mime.types" failed (2: No such file or directory) in /etc/nginx/nginx.conf:12 Now it seems that apt-get install nginx doesn't install it completely, I cleared the apt-get cache, doesn't seem to help. How can I get a full installation of nginx using apt-get?

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• Running out of LowMem with Ubuntu PAE Kernel and 32GB of RAM

  - by magneticMonster

  I'm running a Java data import process on a 32-bit Ubuntu 10 PAE kernel machine. After running the process for a while, the oom-killer zaps my Java process. After some Googling and digging through docs, it looks like the system is running out of LowMem. I started the process for the third time and am watching free -lm show me Low: 464 386 77 with the free value (77MB) slowly decreasing. Why am I running out of lowmem and how do I increase it? Some details: $ cat /proc/sys/vm/lowmem_reserve_ratio 256 256 32 $ free -lm total used free shared buffers cached Mem: 32086 24611 7475 0 0 24012 Low: 464 407 57 High: 31621 24204 7417 -/+ buffers/cache: 598 31487 Swap: 2047 0 2047

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• what service to restart for /var/log/auth.log to start

  - by Bond

  Here is a situation since the log files on my server had grown to several Gigabytes I took a backup of directory /var/log and then manually when to each subdirectory of /var/log and the files which were big in size I did cat > /var/log/file_which_is_big press 2 times enter key (basically over wrote those files with a blank space) and then Ctrl+C So basically I over wrote those files to be blank. Now when I open /var/log/auth.log I don't see any entry (which is expected also since I over wrote) but when I exit the SSH session and login again then also I do not see any entry in auth.log is there any way other than rebooting the machine to make sure I keep getting the entries in /var/log/auth.log I am not sure which service writes in this file. This is a Ubuntu 10.04 server.

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• Why don't I have write permission to my vmware virtual network device?

  - by Robert Martin

  I want to allow my VMWare machine to force the virtual network it's on into promiscuous mode so I can play around with honeyd. I received an error message that told me to go to http://vmware.com/info?id=161 to allow this behavior. Based on their advice, I did: $ groupadd promiscuous $ cat /etc/group | grep promiscuous promiscuous:x:1002:robert $ usermod -a -G promiscuous robert $ id robert uid=1000(robert) gid=1000(robert) groups=1000(robert),....,1002(promiscuous) $ chgrp newgroup /dev/vmnet8 $ chmod g+rw /dev/vmnet8 $ ls -l /dev/vmnet8 crw-rw---- 1 root promiscuous 119, 8 2012-03-29 10:29 /dev/vmnet8 Looks like I gave RW permission to the promiscuous group, and added myself. Except that VMWare still gives me an error message that says I cannot enter promiscuous mode. To try out the group thing, I tried: $ echo "1" >/dev/vmnet8 bash: /dev/vmnet8: Permission denied That really surprised me: It makes me think that I still haven't properly given myself the correct permissions... What am I missing?

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• Windows with putty via USB serial cable to Linux serial port - output ok, input isn't

  - by Aharon Robbins

  I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5). I have /sbin/agetty -L 9600 ttyS0 in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control. I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but cat < /dev/ttyS0 just prints out weird characters from what I type. Any and all suggestions will be welcome. Thanks!

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• How do I configure an interface to have *both* a DHCP address and a static address in Ubuntu?

  - by Paul Hoffman

  In a lab setup, I want eth0 on a Ubuntu server box to get a DHCP address for talking to the outside world, and I also want to assign it a static 10.x.y.z address for talking to other boxes on the local network that have 10.x.y.z addresses. I want to do this by editing /etc/network/interfaces. The man page for /etc/network/interfaces is modeled after "here's a bunch of examples, I hope you can figure out the actual rules on your own". I don't see a way to give one interface two addresses using two different methods (static and dhcp), and initial fumbling didn't produce useful results.

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• Puppetmaster don't notice changes to site.pp

  - by tore-

  Hi, I've just setup a new production environment with puppet. Using 0.25.4 in client/server. Ruby is at 1.8.5, CentOS 5.4. I've made a simple manifest for configuring yum-updatesd, but the puppetmaster doesn't seem to notice changes done to site.pp: err: Could not parse for environment production: Could not match 'node' at /etc/puppet/manifests/site.pp:1 err: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not parse for environment production: Could not match 'node' at /etc/puppet/manifests/site.pp:1 Notice, it says line 1. But line 1 contains an import statement: # cat -n /etc/puppet/manifests/site.pp 1 import "update-notification" 2 3 node default { 4 include update-notification 5 update-notification::configure() 6 } I've tried to reboot the server, delete and recreate site.pp, start and stop puppetmaster and puppet, with no luck. What am I missing?

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• Unable to use pbcopy while in tmux session

  - by user62139

  Running tmux 1.4 installed from ports on snow-leopard I am unable to use the built in OSX pbcopy command. Outside of tmux: > echo "abc" | pbcopy > echo pbpaste # or using ^v abc But inside of tmux: > echo "123" | pbcopy > echo pbpaste abc I've scoured the man page but can't find any options that might relate to this behaivor. I also can't understand why tmux would mess with shell redirection. Anybody have any clues?

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• Can't resolve localhost on Mac OS X Server

  - by iainbeeston

  I have a server running OS X Server 10.5 and it can't resolve localhost to 127.0.0.1. When I try ping this is what happens: ping localhost ping: cannot resolve localhost: Unknown host SSH and web browsers get similar results (uknown host). If I try using 127.0.0.1 or the ip address assigned on the LAN all of the above work. Here's the contents of my /etc/hosts file: cat /etc/hosts ## # Host Database # # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost I have no local DNS service running. Does anyone have any idea why this might be happening or how I can fix it?

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• setting ulimit and ubuntu 8.04

  - by Wizzard

  Hi there, We have two ubuntu 8.04 servers. With the database server I set the table_cache to 1000 however when I restart mysql the status only shows 257 and the open files limit says 1024 I adjusted ulimit by doing ulimit -n 8192 and then restarting mysql; this seemed to do the tick however after a few hours I did ulimit -n and saw it had returned back to 1024 Bit of a worry. I edited the /etc/security/limits.conf and added mysql soft nofile 8192 mysql hard nofile 8192 then rebooted, no change. I then edited and change mysql to * rebooted, no change I then edited and changed it to one line * - nofile 8192 and rebooted, no change. cat /proc/sys/fs/file-max gives me 768730 sysctl fs.file-max gives me fs.file-max = 768730 I am at a bit of a loss to how I can set and keep the ulimit value set so I can increase the table cache properly on mysql.

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• Dovecot throws obsolete warnings, even though dovecot.conf updated on Ubuntu 11

  - by John Bowlinger

  In trying to set up SASL for dovecot on Ubuntu 11, I keep getting obsolete warnings in my log: Sep 10 15:33:53 server1 dovecot: config: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:24: passdb {} has been replaced by passdb { driver= } Sep 10 15:33:53 server1 dovecot: config: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:27: userdb {} has been replaced by userdb { driver= } Even though my dovecot.conf file looks like this: protocols = none auth default { mechanisms = plain login passdb { driver=pam } userdb { driver=passwd } socket listen { client { path = /var/spool/postfix/private/auth mode = 0660 user = postfix group = postfix } } } Even when I try: driver=etc/pam.d/dovecot driver=etc/passwd I still get the same error. Looking at the example config file: cat /usr/share/doc/dovecot-common/dovecot/example-config/dovecot.conf was of no help. Dovecot is running: ps -A | grep 'dovecot' 9663 ? 00:00:00 dovecot But I can't seem to get that elusive "dovecot-auth" process. Anyone know what's going on?

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• sudo -i not behaving as expected

  - by jpdoyle

  Why sudo -i command is not setting the TERM, PATH, HOME, SHELL, LOGNAME, USER and USERNAME on my fresh Ubuntu 12.04.1 LTS as decribed in the manual? # sudo -u johnny -i echo $HOME && echo $USER /root root Using -H is not setting $HOME either. And my user does exist with a home : # cat /etc/passwd [..] johnny:x:1000:1000::/home/johnny:/bin/bash Update : Why am I having this issue? Because I am trying to create an ubuntu upstart job for multiple unicorn applications & I am using user installation of RVM + Bundle : without $HOME being properly evaluated, RVM do not find ~/.rvm.

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• Immutable hard links on ext3/4?

  - by shovas

  In my research on file versioning at the fs level, snapshotting, and related ideas, I took a look at hard-links and exactly what they are and how they behave. Using rsync you can get a pretty slick poor man's snapshotting system up and running on file systems that don't natively support it. But, can you get immutable hard links on ext3/4 or any other file systems for that matter? My definition for immutable hard link is: A hard link which, when changed on one location, becomes a regular copy and no longer a hard link. I would like this because it would enable snapshotting use of the source data to link against instead of a copy of the data (in the case of the rsync snapshotting technique). I have gigabytes of data that can't be duplicated due to space restrictions but I have enough room if I can intelligently snapshot individual changed files with the rest linked to the source not a copy. Given all that, is there some other technique, feature or technology I'm really looking for?

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• PostgreSQL timezone does not match system timezone

  - by Martin C.

  I have several PostgreSQL 9.2 installations where the timezone used by PostgreSQL is GMT, despite the entire system being "Europe/Vienna". I double-checked that postgresql.conf does not contain timezone setting, so according to the documentation it should fallback to the system's timezone. However, # su -s /bin/bash postgres -c "psql mydb" mydb=# show timezone; TimeZone ---------- GMT (1 row) mydb=# select now(); now ------------------------------- 2013-11-12 08:14:21.697622+00 (1 row) Any hints, where the GMT timezone could come from? The system user does not have TZ set and the /etc/timezone and /etc/timeinfo seem to be configured correctly. # cat /etc/timezone Europe/Vienna # date Tue Nov 12 09:15:42 CET 2013 Any hints are appreciated, thanks in advance!

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• How can I kill and wait for background processes to finish in a shell script when I Ctrl+C it?

  - by slipheed

  I'm trying to set up a shell script so that it runs background processes, and when I ctrl+C the shell script, it kills the children, then exits. The best that I've managed to come up with is this. It appears that kill 0 -INT also kills the script before the wait happens, so the shell script dies before the children complete. Any ideas on how I can make this shell script wait for the children to die after sending INT? #!/bin/bash trap 'killall' INT killall() { echo **** Shutting down... **** kill 0 -INT wait # Why doesn't this wait?? echo DONE } process1 & process2 & process3 & cat # wait forever

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• How to securely generate memorable passwords?

  - by Tim

  Whenever I need new passwords I use some tools to generate those, preferable memorable passwords, but I've been wondering how secure this might actually be. Using The xkcd random number generator is probably pretty bad, cat /dev/random is probably pretty good, but generating memorable passwords seems a bit more tricky. Whenever a program generates a memorable password, it only uses a subset of the total password space available, and it is not clear to me how big this space is. Of course a long password should help in this case, but if the `memorable' part of the program is too predictable, your passwords are not very good in the end. TL;DR: how secure are memorable password generators, given the fact that `memorable' passwords are a subset of total password space? Some tools I know of: pwgen -- seems ok, but passwords are not too memorable Mac Password Assistant - generates memorable passwords but it is unclear to me how this works.

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• Stopping an specify Apache instance

  - by user1435991

  I have two Apache instances setup in my server (Solaris 10): Instance 1: /etc/apache2 Instance 2: /etc/apache2-instance2 To start the instance 1, I execute the following command: /usr/apache2/bin/apachectl -f /etc/apache2/httpd.conf And instance 2: /usr/apache2/bin/apachectl -f /etc/apache2-instance2/httpd.conf Both instances run perfectly, however the problem comes when I want to stop the instances. I have not been able to find a parameter to indicate what instance I want to stop. if I execute this command: /usr/apache2/bin/apachectl -k stop It will stop always the Instance 1 (the default one). The only solution that I could find to stop the instance 2 was to do this: kill -TERM 'cat /var/run/apache2-instance2/httpd.pid' Is this the only way to do it? or what is the best solution? I remember that I did something similar in Ubuntu setting a the global variable APACHE_CONFDIR before calling apachectl

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