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Linux – Ken’s Chronicles & Memory Dumps Skip to content Ken's Chronicles & Memory Dumps I have a bad memory, so here’s some stuff I may need to remember later. LinuxWhackscript redirects to file when run from cmdline, but doesn’t work when run from cron December 21, 2017 by admin I crafted up a linux whack script to export server names (FQDN) from puppet. A few minor adjustments, and it was working a treat (from root!). However without subtracting the script to cron, I just couldn’t get it to work when launched from roots crontab. Resolution Long story short, I needed to add the path to the top of the script. export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/puppetlabs/bin Categories Linux Nagios – Return lawmaking of 255 is out of bounds-[LKB.0004] November 2, 2016November 2, 2016 by admin Symptoms The Nagios web GUI is showing: (Return lawmaking of 255 is out of bounds) Causes Read-Only Filesystem on client. nrpe configuration on vendee File/Directory Permissions on client. Firewall blocking port 5666. Solutions In the specimen of a Read-Only Filesystem, run a filesystem trammels (fsck). In the specimen of configuration, add the server ip in remote hosts’s nrpe.cfg file. In the specimen of a permissions issue, trammels and modify the permissions as required. In the specimen of Firewall blocking, NRPE by default runs on port 5666, ensure that that port is allowed.     Categories Knowledgebase, Linux, Nagios The /var/log/lastlog file has very large size on a ESX host (1025579)-[LKB.0003] December 22, 2016October 4, 2016 by admin Symptoms The size of /var/log/lastlog file is very large, to the point of possible stuff larger than the underlying file system.[root@esx41vm log]# df -h . Filesystem            Size  Used Avail Use% Mounted on /dev/sdc2             2.0G   45M  1.8G   3% /var/log [root@esx41vm log]# ls -lh lastlog -rw-r–r– 1 root root 354G Jul 30 09:29 lastlog Using the du writ shows the size of the /var/log/lastlog file within normal limits:[root@esx41vm log]# du -h lastlog 44K     lastlogRationalizationOn several versions of RedHat Enterprise Linux and Fedora, self-indulgence in this file can rationalization the size to be misrepresented. Resolution The /var/log/lastlog file is used to store information well-nigh the successful logins to the host.  On several versions of RedHat Enterprise Linux and Fedora, self-indulgence in this file can rationalization the size to be misrepresented.  This has no effect on the real space used by the file, as reported by the du command. To correct the improper file size of the /var/log/lastlog file, it needs to be recreated. To recreate the lastlog file, run this command: > /var/log/lastlog Note: This writ deletes any data on the lastlog file. This writ deletes the previous file and removes any record of log in to the system. If you wish to retain this information, use the lastlog writ to export the log in information surpassing recreating the/var/log/lastlog file. lastlog > /tmp/lastlog.txt The lastlog.txt file can then be saved to a secure location. ** UPDATE ** According to the lastlog man page: The lastlog file is a database which contains info on the last login of each user. You should not rotate it. It is a sparse file, so its size on the disk is usually much smaller than the one shown by “ls -l” (which can indicate a really big file if you have in passwd users with a upper UID). You can exhibit its real size with “ls -s“. Categories ESX/VMware/vCenter, Knowledgebase, Linux Backlog Limit Exceeded-[LKB.0002] October 12, 2016September 8, 2016 by admin Symptoms The system becomes unstable and/or unresponsive. Other symptoms may include the inability to log into the system and/or upper CPU usage.RationalizationBuffer limit is too low Solutions 1. Raise auditctl buffer: Edit, /etc/audit/audit.rules Change “-b 320” to “-b 8192” or higher restart daemon: service auditd restart 2. Disable audit: To disable the inspect daemon, run the pursuit commands : /etc/init.d/auditd stop chkconfig auditd off Categories Knowledgebase, Linux Nagios – Ghost Hosts [LKB.0001] October 4, 2016September 5, 2016 by admin Symptoms You delete Host/s & Service/s in Nagios via: Configure > Core Config Manager > [Hosts | Services], but the Nagios DashBoard is showing alerts for the Host/s and Service/s deletedRationalizationUnknown. Although, it seems to occur when a host &/or service are deleted when they are once in a error/warning state, or if you have multiple instances of Nagios running. Solution If by endangerment the host and all of it’s services are completely deleted in the Core Config Manager, and the very host config file is still there without using the Write Config Tool, then go superiority and delete the config file manually. The files will be located in the pursuit directories: /usr/local/nagios/etc/hosts /usr/local/nagios/etc/services Then restart Nagios: service nagios restart Categories Knowledgebase, Linux, Nagios Linux: Find deleted files that still have file handles unshut October 12, 2016August 15, 2016 by admin When a file is deleted on a Linux system that still has a process running using that file, your disk space will be miss-reported. To find the process and files that have been deleted, that still have file handles open, run the pursuit command.   find /proc/*/fd -ls | grep -i deleted You can moreover use the ‘lsof’ command, if that is installed on your system. Once you have identified the file/s and process, you can go well-nigh investigating and stopping the process to release the file handle/s.     Categories Knowledgebase, Linux, Tips/How-to Renaming or Deleting files with preceding dash/hyphen October 12, 2016November 16, 2015 by admin To rename a file that has preceding “-” (dash/hyphen), you need to use the end-of-options flag, which is a double-dash, as follows: rm -- -badFileName goodFileName or mv -- -badFilename goodFileName Categories Linux, Tips/How-to Watching Netflix on linux December 22, 2016October 16, 2015 by admin In order to watch Netflix on linux, install the Google Chrome browser. Although the Google Chrome browser is based on the Chromium browser, the Chromium browser does not support Netflix. ** UPDATE ** https://linuxconfig.org/play-netflix-on-linux-with-firefox Categories Browser, Linux, Netflix8,348 Comments Quickly converting mp3’s to wav’s on the writ line. December 22, 2015June 2, 2010 by admin My rencontre for the day was to quickly convert a couple of mp3 files to wav format so that I could create a music CD. Here’s how to do it via the writ line using mpg123: mpg123 -w file.wav file.mp3 CategoriesWritLine, Linux, mp3|wav|m4a|flac, Music Of fwid’s, iPods and Linux December 22, 2015May 25, 2010 by admin Today I had to reprinting some MP3’s from my palmtop to a friends a iPod. Sounds like a simple unbearable task, however, I detest iTunes, and to lesser stratum Windows. I’m running PClinuxOS (Zen Mini 2010 version), and since iTunes under Linux is rubbish to say the least, the rencontre was to reprinting the MP3’s onto the iPod without trashing what was once on the iPod. The first step was to install Floola via Synaptic, once installed, I unfluctuating the iPod and started Floola. I was then prompted for a fwid of the unfluctuating iPod. WTF is a fwid? It turns out that a fwid is a 16 weft string which identifies an iPod (like a serial number or MAC address).  So how do you find the fwid of a unfluctuating iPod? Well, here’s the wordplay for each OS: Windows If iTunes is installed FWID should be retrieved automatically, otherwise (XP or newer only):Unshutthe Control Panel and got to Device manager Find your iPod in the list of devices (probably under nonflexible drives) and double click it Go to Details tab and select Device Instance ID in the waif lanugo box The FWID is the 16 digit number near the end of the string shown Linux Connect your iPod In terminal type: sudo lsusb -v | grep -i Serial Look for your iPod device, the FWID should be the 16 weft long string shown. Mac From the world menu (top left of screen), selectWell-nighthis Mac and click More Info (optional) Select Mini Profile in the View menubar In the left post select Hardware and then USB In the USB Device Tree you should see your iPod listed, select it, the FWID is the Serial Number listed in the lower box Once the fwid was found and entered, it was just a simple specimen of subtracting the files to the iPod using Floola. Job washed-up 🙂 Categories Linux, mp3|wav|m4a|flac, Music, USB Tweets by @BaldGuyKen CategoriesBackups BrowserWritLine ESX/VMware/vCenter Excel Knowledgebase Linux mp3|wav|m4a|flac Music Nagios Netflix Network/Router Productivity Ramble Security Storage Tips Tips/How-to USB Windows Archives Archives Select Month December 2017  (1) November 2016  (2) October 2016  (1) September 2016  (2) August 2016  (2) December 2015  (2) November 2015  (1) October 2015  (2) February 2015  (1) May 2014  (1) January 2013  (2) June 2010  (1) May 2010  (1) © 2018 Ken's Chronicles & Memory Dumps • Powered by GeneratePress