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Knowledgebase – 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. Knowledgebase 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 Excel: Arrow keys are scrolling the whole spreadsheet, instead of just moving to the next cell. October 17, 2015February 11, 2015 by admin I’ve been cought out but this in a few occasions… Symptoms: When you use the keyboard arrows, it scrolls the whole spreadsheets instead of just moving to the relevant cell. Cause: The Scroll Lock key is on. Resolution: Disable Scroll Lock. Categories Excel, Knowledgebase, Productivity, Tips Sorry, Netflix hasn’t come to this part of the world yet October 17, 2015May 28, 2014 by admin I’ve been streaming Netflix on a Roku 3 without issue for a while. Then suddenly yesterday started getting the “Sorry, Netflix hasn’t come to this part of the world yet” error. Roku recently released a new software update that causes the Netflix app to sometimes report that it’s not misogynist in your location. Follow the instruction unelevated (BlockingWangleto Google’s DNS Server) to fix this. BlockingWangleto Google’s DNS Server The Netflix app on some Roku devices is hard-coded to use Google’s DNS server (8.8.8.8). The good news is if you woodcut wangle to Google’s DNS, it falls when to the DNS servers configured on your router (ours!). So here’s how to do it… squint for a section on your router to add static routes, there should be room for a network address, subnet mask and gateway. You need to setup a static routes like this: Network Address: 8.8.8.8 Subnet Mask: 255.255.255.255 Gateway: (use the IP write of your router – this is the IP that’s in the browser URL) You will moreover need to add flipside entry for the Network Address: 8.8.4.4   What this does is gravity your router to route requests to Google’s DNS server to itself, which will never get to Google, so it will never work, and your Roku will fall when to using the DNS servers configured in your router. Once done, restart your Roku and try to use Netflix, it should now work! More info: http://support.unblock-us.com/customer/portal/articles/1523907-solutions-for-region-issues-with-roku-and-netflix Categories Knowledgebase, Netflix, Network/Router, Tips 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