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Ken’s Chronicles & Memory Dumps – I have a bad memory, so here’s some stuff I may need to remember later.

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Ken’s Chronicles & Memory Dumps – I have a bad memory, so here’s some stuff I may need to remember later. Skip to content Ken's Chronicles & Memory Dumps I have a bad memory, so here’s some stuff I may need to remember later.Whackscript 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 Windows Server – List Listening Ports November 16, 2016 by admin I haven’t needed to list Listening Ports on a Windows Server before, expecially since I mostly use Linux for the type of things that would require me to do so. Anyway, here is a writ to show all listening TCP and UDP ports on a Windows server. netstat -an | find /i "listening" Categories Windows 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 The Glass Half Full/Empty Proposition. August 16, 2016August 16, 2016 by admin A pragmatist take on the eternal pessimist/optimist question: Is the glass half empty, or half full.  Specimen#1. Where the last whoopee versus the vessel was removal of some of it’s content capacity, to the point were the vessel is now holding half of it’s capacity, then the vessel is Half Empty. This is considering the last whoopee was emptying the vessel.  Specimen#2. Where the last whoopee versus the vessel was wing to the content capacity, to the point were the vessel is now holding half of it’s capacity, then the vessel is Half Full. This is considering the last whoopee was filling the vessel.  Specimen#3. Where the last whoopee is unknown: a) Then the vessel is simply at half of it’s capacity. b) Add an amount, then remove an value equal to the value widow to return to a known state, in this specimen Half Empty. (SeeSpecimen#1 above) c) Remove an amount, then add an value equal to the value removed to return to a known state, in this specimen Half Full (seeSpecimen#2 above)   I hope this helps settle any arguements. Categories Ramble 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 Is your browser unscratched versus tracking? December 22, 2015 by admin The Electronic Frontier Foundation have provided an on-line browser tracking checker, which does a series of checks versus your browser to see how protected you are versus tracking. From the EFF website: “When you visit a website, online trackers and the site itself may be worldly-wise to identify you – plane if you’ve installed software to protect yourself. It’s possible to configure your browser to thwart tracking, but many people don’t know how. Panopticlick will unriddle how well your browser and add-ons protect you versus online tracking techniques. We’ll moreover see if your system is uniquely configured—and thus identifiable—even if you are using privacy-protective software.” Run you trammels here: https://panopticlick.eff.org/ Categories Browser, Security Microsoft Office keyboard shortcuts for Strike-Through December 22, 2015December 22, 2015 by admin True to Microsoft’s worthiness to be unceasingly inconsistent, the keyboard shortcuts for ‘Strike-Through” are variegated between products:   OneNote: Highlight text, <ctrl>+<hyphen> Other OneNote shortcuts: https://support.office.com/en-us/article/Keyboard-shortcuts-in-OneNote-2013-65dc79fa-de36-4ca0-9a6e-dfe7f3452ff8   MS Excel: Highlight text, <ctrl>+<5>   Word: There is none by default!, however you can assign your own by pursuit these instructions: http://wordribbon.tips.net/T005940_Strikethrough_Shortcut_Key.html Categories Excel, Productivity Post navigation Older posts 1 2 Next → 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