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• Checking that tasks are executed

  - by homer5439

  I'm not sure how to explain this. Once one starts having dozens or hundres of servers, each running some sort of periodic jobs (mostly from cron), there is a problem of making sure (or as sure as possible) that these tasks are actually ran. I mean, I get an email if a job fails fails, and no mail if it succeeds, but also no mail if it doesn't run for whatever reason. Sure, I could change them and have them send a "successfully ran" email, only to be flooded by mails that most of the time I don't want to see. Basically, I want to be notified only if: a task ran and failed a task didn't run at the expected time. Is there a way to do this?

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• can I use @reboot in cron.d files?

  - by fschwiet

  I want to run a job with cron on reboot as a particular user. I have been able to do this successfully using crontab to write to /var/spool/cron/crontabs/username with something like: @reboot ./run.sh >>~/tracefile 2>&1 However, I want to use /etc/cron.d/filename. Cron jobs in this file require an extra column to indicate what user runs, so I use: @reboot wwwuser ./run.sh >>~/tracefile 2>&1 This doesn't seem to work. Should I be able to use @reboot with a username in a cron.d file?

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• Kill all currently running cron jobs

  - by Adelphia

  For some reason my cron job scripts aren't exiting cleanly and they're backing up my server. There are currently a couple hundred processes running for one of my users. I can use the following command to kill all processes by that user, but how can I simplify this to kill only crons? pgrep -U username | while read id ; do kill -6 $id ; done It would be dangerous to run the above command as is, correct? Wouldn't that kill mysql and other important things?

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• Can I use Cygwin as a replacement for Ubuntu, for bash script testing?

  - by Jeroen De Meerleer

  Next wednesday i'm having an exam on Operating Systems. In this exam there will also be a part bash-scripting. The teacher itself will test the scripts in a Virtual Machine running Ubuntu. Myself, however, I'm having serious troubles with running the latest Ubuntu (14.04 LTS) on a Virtual Machine (there are troubles with gnome running very slow). So I'm thinking about using Cygwin, which is doing the job great for another course. The teacher already confirmed I can use that, but I'm thinking he doesn't know it at all. I've already tested the scripts we made in class and they're all running without errors. But I'm quite sure there are some things I have to mind on. My question: would you use Cygwin as a replacement for the Ubuntu VM? Or should I stick it with the VM (maybe by using a different config/platform).

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• Everything You Ever Wanted to Know about Mod_Rewrite Rules but Were Afraid to Ask?

  - by Kyle Brandt

  How can I become an expert at writing mod_rewrite rules? What is the fundamental format and structure of mod_rewrite rules? What form/flavor of regular expressions do I need to have a solid grasp of? What are the most common mistakes/pitfalls when writing rewrite rules? What is a good method for testing and verifying mod_rewrite rules? Are there SEO or performance implications of mod_rewrite rules I should be aware of? Are there common situations where mod_rewrite might seem like the right tool for the job but isn't? What are some common examples?

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• Reverse proxy - how should it be done?

  - by Thomas M.

  I have a currently running server with Apache that is working great! However, I want to buy a VPS and use that as a proxy between the user and the "old" server. So the new server's only job is actually to just forward the traffic from the VPS to the old Apache server. How can I achieve this the best way? I've read something about nginx proxy, but don't know if that's what I should use? The IDEAL way (for me) would be to now even touch the running server. I just want to setup the VPS as proxy, forward the DNS to the proxy instead, and let the proxy take over the connection to the primary server. Is that possible? I would really like to hear your opinions about this, and how you would do this (would be happy if you could link me to some tutorial)! :) The VPS is running CentOS and the running/primary is running Debian. Thanks in advance.

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• Amazon S3 - Storage Class and Server Side Encryption

  - by Steven

  Ahhh! I am using Amazon S3 for some low price storage to clear down out SAN. I created the bucket and created a root folder. I set the storage class to standard and server side encryption AES. I started a copy job to move the files, some files copied over and i checked the files: Reduced Redundancy Encryption set to none WTF? So i deleted all files and folders. I manuallyed created the folder structure and again set the storage class and encryption level. I coped some files and bamm, still showing (at a file level as Reduced and no encryption). So my question is this, is it really raid'd and encrypted just not showing it properly (as the root folder is, how can the file not be??) or (b) am i being a huge tool and missing something?

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• How to deploy Windows-8 Enterprise Apps to other users?

  - by TToni

  Windows-8 (Metro) Apps can be installed using "sideloading", bypassing the Windows store in enterprise environments. In principle this is easy: Once you enabled sideloading (which is automatically done when a Win8-machine joins a domain), you can install a signed appx-Package through PowerShell with the "Add-AppxPackage" command. But there is a catch: The App is only installed for the user who executes the command and there is no "-Credentials" parameter! I can probably solve that problem in my specific scenario, where I deploy a self-developed app through TFS build to a virtual machine with a fixed demo user (by using remote powershell in combination with "Add-Job", which does take a credential parameter and because I know the given username and the password). But that is not true in an enterprise environment, where I want to distribute my App to thousands of users. Cracking all their passwords seems a bit over the top, so what would be the "correct" way to do this? I can't find any useful information from Microsoft about this, but maybe one of you already ran into this problem and solved it?

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• LAN full of public ipv4 addresses - How to filter it?

  - by sparc86

  The answer to my question maybe is not that hard but anyways, I do not know what to do. So, I just got in a new job in a Univerisity and I found out that the network (the LAN) is full of public IP addresses. Seriously, the whole LAN (probably more than 150 hosts) has it' own internet IP address and I don't know how to manage it. I have a very good experience using iptables (Linux firewall) in a NAT'ed environment. But then how should I proceed in an environment where all my LAN is working with a bunch of public IP addresses? Should I just use the "forward" rules and ignore the NAT rules or is there any other issue in such environment which I should take care? Can I add a firewall between the router and the LAN in order to produce packet filtering for these public IP addresses in my LAN or will this just not work? Thanks!

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• Solutions for scheduling cronjob

  - by Shamsul

  I have setup a list of corn, Some of the corn script takes long time like 1-5 hours, and its increasing day by day. I do not want to run two corn script at the same time, its not for the dependency, bu its because my server memory is not that much so that it can not handle two big operation, so i need to find out a solution so that the scheduled scripts will not start until the other previous script no finished. i have 10-15 corn job in the list. and 5 of them i do not want to overlap. Anyone help me find out any solutions?

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• Can't connect to ssh after nfs problem

  - by MihaiM

  Hello, I had a problem yesterday with a server that lost connection (S1). From that server, there was a dir shared with NFS to another one (S2), no homedir and not in $PATH, but a dir to store old files for archiving. S1 was back online after a few hours, but now I cannot access S2 because of this (and I'm sure it's because of that because all other services are running without any problem). The ssh connection hangs here: debug1: Entering interactive session. I know a reboot will do the job, but considering this is the NAS of a big app, my bosses will kill me if I do it. Is there any other way to get over this? I tried with different users, but all of them hang in the same place. I connected with HP iLO and not even there I cannot use my username. Thanks in advance.

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• How I can be alerted if an application is not running in Windows 2008 R2?

  - by Magnetic_dud

  I have a critical application that I need to have it running on my server. Unfortunately it's poorly coded and it keeps crashing. If it's not running it's a big problem, but I can't use a simple application monitor like this because if the app crashes I need to input the configuration again - so I can't just run it again, I have to RDP into the server and manually start it again. So I need a monitor that sends me an email if the process has been stopped. Anyone knows a program that can do that job? I couldn't find it

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• Transfer using linux ssh and maintaining permissions

  - by jbolt

  I need to transfer files across ssh to another server. The file structures are identical on both sides. I have used scp -r but that does not retain the orginal file/dir permissions. rsync does the job of keeping the permissions in tact but does not delete the files on the destination side if I want to overwrite them because of changes. I know rsync will write the changes when the source files are newer but I need it to just copy everything reguardless of the date (ie replace destination directory with the one I am moving) without having to shell into the destination first and manually delete the dir. I heard tar can do this but I can not seem to get it to work without errors. The syntax is tar -cf - /directory/directory | ssh host.name tar -xf - C /destination_directory Any help would be appreciated.

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• rsync stuck with the --checksum option

  - by billc.cn

  I use back-in-time to backup my Linux installation. It serves as an advanced wrapper for the rsync command. Today I tried to add /var/log to the list of folders to be backed up and it caused some serious performance problems. The job seems to stuck on a particular file and the CPU usage of the rsync parent process reaches 100%. I then used lsof to see which file caused the problem and it seems to be the /var/log directory. I did some googling and some experiments with the different rsync options and found --checksum to be the offender. Without the parameter, an incremental backup finishes properly in minutes. With it, the process will stuck when rsync tries to sync a constantly changing log file. This kind of make sense, but it still seems to be a bug to me. Am I using the option correctly? Is there a workaround for this?

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• Authentication through mod_auth_kerb should provide website with no user if no TGT provided

  - by loomi

  Users are authenticated by mod_auth_kerb which works great. Therefore I need to set Require valid-user If there is no valid user Apache fails with an 401 Authorization Required. I would like Apache to deliver the website anyway but not providing a remote_user to the underlying script. This is related to How to tell mod_auth_kerb to do its job despite no "require valid-user". But with the important difference that on a whole subdirectory on every url a kerberos negotation should be initiated, and if it fails it should deliver the content anyway.

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• Need help configuring NAT

  - by QuinnFTW

  First of all, the router I am using is a Cisco WRVS4400N. My company runs a software which handles the MySQL database of all of their products. The software now has an e-commerce module, so I have to set up a secure tunnel from our network to the server that will be hosting our e-commerce site so that when the database is updated, the site will also be updated. The technician completeing the job said there is an IP conflict, and has asked me to NAT 192.168.0.0/24 to 192.168.115.0/24. I am not really sure how to do this, and they want to charge $150 an hour to do it for me. Can anyone help?

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• How to autostart service in ANY linux?

  - by user329115

  I need to install the dumbest possible service (a binary) and have it reliably run as the current user at boot (or login, whatever) at as many platforms as possible (of the aging point-of-sale type). The app monitors another archives generated by another app in the user-session. Startup alternatives considered: init.d @reboot in crontab a .desktop file in ~/.config/autostart a myriad of other solutions including .profile and .bashrc All of the above break down at some point. The problems stem from not wanting to run as root (I want the files generated to be user-accessible), and not having a way to reliably get the current user name in sudo on all platforms. Ideally not even sudo can be assumed available. Hey, I just want to run something on boot and I have "root" power to do so. Windows get the job done easily enough. This isn't rocket science, is it?

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• Can a Cisco 3550 be used as router?

  - by kubiej21

  I'm not sure if this is the correct place to ask such a question, but I'll give it a shot anyway. If it isn't, let me know, and I'll remove this post. Anyway, very recently I picked up a Cisco 3550 just to play around with networking and to familiarize myself with Cisco's command line configuration due to the fact that I will be working an electrical engineering internship in which I will have to deal with various networking issues (yes, I agree that a CSNA would be much better suited for this task, but since its part of the job requirements, I'm willing to learn about it). What I was wondering, is whether or not my 3550 can act as a router. I know its a L3 switch, but does that mean it can take the place of a router?

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• Is LDAP typically used in conjunction with SAP?

  - by michael

  I have potential clients that all use SAP. To avoid silent push back from IT, we want to make sure we don't add extra complexity to their job if the client (our client internal to the company is not IT) wants to adopt our SaaS. One way to avoid headaches is to add support for LDAP in our SaaS (a bit of work, but nothing major) ahead of time and make sure to mention that to IT. I really know nothing about SAP. Does SAP use an internal or external LDAP server usually? Updated question: A Company relies on an Asset management product from SAP. If I wanted to provide a SaaS that shares space in their workflow, is it advisable to use the SAP product authentication service (if it exists), and if so, do they provide an API?

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• Ubuntu upstart hangs on interactive start & stop

  - by danorton

  How do I get Ubuntu upstart to not hang on interactive start & stop? I have created many upstart scripts that work fine during init, but often hang when I enter them at the console. If I CTRL+C out, all that happens is that the job changes state. The script is never run. I’m running Ubuntu Lucid on a Xen virtual server with a Linux 2.6.39 kernel. Below is merely a representative example of many scripts that behave this way: description "apache2" start on local-filesystems \ and (net-device-up IFACE=lo) \ and (runlevel [2345]) stop on runlevel [016] respawn respawn limit 10 5 expect daemon script . /etc/apache2/envvars /usr/sbin/apache2ctl start end script

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• Performance impact of running Linux in a virtual machine in Windows?

  - by vovick

  Hello, I'd like to know what performance impact I could expect running Linux in a virtual machine in Windows. The job I need Linux for is heavy and almost non-stop code compilation with GCC. Dual-boot doesn't look like a very attractive solution, so I'm counting on low VM overhead right now (10-20% would be fine for me, but 50% or more will be unacceptable). Did anyone try to measure the performance difference, are there any comparison tables? What virtual machine with the lowest overhead possible will you suggest? My host OS is Win7 and I've got a modern Core i7 with VT-x present. Thanks!

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• Excel axis problem

  - by itid

  I am graphing the height above sea level obtained by GPS at 12 measuring stations, which are distributed along a straight line but NOT equidistantly. Excel does a nice job of creating a suitable Y axis. But, it insists on placing the 12 stations equidistantly along the X axis. Consequently, the line graph does not represent the true cross section of the terrain. It is only true at the stations themselves. Surely there must be a way that I can enter the actual distances between the stations into a column, and get Excel to read from that column and space the values accordingly? It is such a basic mapping procedure for geologists and many others. Thanks

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• Can't start mysql - mysql respawning too fast, stopped

  - by Tom

  Today I did a fresh install of ubuntu 12.04 and went about setting up my local development environment. I installed mysql and edited /etc/mysql/my.cnf to optimise InnoDB but when I try to restart mysql, it fails with a error: [20:53][tom@Pochama:/var/www/website] (master) $ sudo service mysql restart start: Job failed to start The syslog reveals there is a problem with the init script: > tail -f /var/log/syslog Apr 28 21:17:46 Pochama kernel: [11840.884524] type=1400 audit(1335644266.033:184): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=760 comm="apparmor_parser" Apr 28 21:17:47 Pochama kernel: [11842.603773] init: mysql main process (764) terminated with status 7 Apr 28 21:17:47 Pochama kernel: [11842.603841] init: mysql main process ended, respawning Apr 28 21:17:48 Pochama kernel: [11842.932462] init: mysql post-start process (765) terminated with status 1 Apr 28 21:17:48 Pochama kernel: [11842.950393] type=1400 audit(1335644268.101:185): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=811 comm="apparmor_parser" Apr 28 21:17:49 Pochama kernel: [11844.656598] init: mysql main process (815) terminated with status 7 Apr 28 21:17:49 Pochama kernel: [11844.656665] init: mysql main process ended, respawning Apr 28 21:17:50 Pochama kernel: [11845.004435] init: mysql post-start process (816) terminated with status 1 Apr 28 21:17:50 Pochama kernel: [11845.021777] type=1400 audit(1335644270.173:186): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=865 comm="apparmor_parser" Apr 28 21:17:51 Pochama kernel: [11846.721982] init: mysql main process (871) terminated with status 7 Apr 28 21:17:51 Pochama kernel: [11846.722001] init: mysql respawning too fast, stopped Any ideas? Things I tried already: I googled and found a Ubuntu bug with apparmor (https://bugs.launchpad.net/ubuntu/+source/mysql-5.5/+bug/970366), I changed apparmor from enforce mode to complain mode: sudo apt-get install apparmor-utils sudo aa-complain /usr/sbin/mysqld sudo /etc/init.d/apparmor reload but it didn't help. I still can't start mysql. I also thought the issue may be because the InnoDB logfiles were a different size than mysql was expecting. I removed the innodb log files before restarting using: sudo mv /var/lib/mysql/ib_logfile* /tmp. No luck though. Workaround: I re-installed 12.04, made sure not to touch /etc/mysql/my.cnf in any way. Mysql is working so I can get on with what I need to do. But I will need to edit it at some point - Hopefully I'll have figured out a solution, or this question will have been answered by that point...

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• I want to construct web page for my department, I want your advice

  - by gcc

  I want to help freshmen , so I will construct web page for them . In that webpage , I will have some topic ; While installing ubuntu what you should consider ? ( ex : are there any driver-confliction ? ) [ So freshman do not know how to install ubuntu, or they think everything is completed when ubuntu-cd finish its job ] problem-solving style best book to learn ( x ) language general advice for departman how should I study programming languages some web page to introduce ubuntu, deeply some web page to introduce Makefile Assume; If you are in my position, Would you construct web page like that If you want to construct, which topic will you add ? which topic will you remove? NOTE: If you do not like my language you are free to give me advice to fix my fault. EDIT: I am student . How they expect I will send a great question.If they havenot fix me , How they expect I will improve myself, or help the other. I just want help freshman.Is it a big mistake ?

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• Messed up installation of mysql-server - cannot complete installation or deinstallation

  - by Christian Engel

  apt-get got stuck while installing mysql-server. I don't know why but it just stopped working and never continued. I had to reboot the machine in the middle of the setup process. Now, if I try to install or purge the mysql-server package, apt-get tries to configure mysql-server first (tells me its not installed before that) and cancels with a error message: Sub-process /usr/bin/dpkg returned an error code(1) apt-get also tells me that two packages have not been successfully installed or removed. this is the complete console output: christian@devbox:~$ sudo apt-get install mysql-server [sudo] password for christian: Reading package lists... Done Building dependency tree Reading state information... Done mysql-server is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 17 not upgraded. 2 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? y Setting up mysql-server-5.5 (5.5.32-0ubuntu7) ... start: Job failed to start invoke-rc.d: initscript mysql, action "start" failed. dpkg: error processing mysql-server-5.5 (--configure): subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of mysql-server: mysql-server depends on mysql-server-5.5; however: Package mysql-server-5.5 is not configured yet. dpkg: error processing mysql-server (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: mysql-server-5.5 mysql-server E: Sub-process /usr/bin/dpkg returned an error code (1) christian@devbox:~$

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