https://tech.snathan.org/ 2026-04-24T21:15:06+00:00 https://tech.snathan.org/ https://tech.snathan.org/_media/wiki/dokuwiki.svg text/html 2025-01-20T12:28:29+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/dellr630_debian?rev=1737376109&do=diff Installing Debian Bookworm on Dell PowerEdge R630 Debian is not a supported operating system on the Dell PowerEdge R630. However it is possible to install it successfully. Before Install Server settings before install * Make sure the server has boot mode as UEFI instead of BIOS. This is typically the default. Press F2 to get into System Setup to review and confirm. text/html 2015-03-24T11:29:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/dokuwiki?rev=1427196555&do=diff Scripts, tips, tools about Dokuwiki Clean-up History Script to clean up all revision history DOKUWIKI_DATADIR=/path/to/docuwiki/data # find $DOKUWIKI_DATADIR/meta/ -type f -name "*.changes" -delete find $DOKUWIKI_DATADIR/attic/ -type f -name "*.txt.gz" -delete find $DOKUWIKI_DATADIR/media_attic/ -type f -name "*.*" -delete text/html 2023-12-30T12:29:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/generate_prime_factors?rev=1703939355&do=diff Generate Large Prime Factors Simple Linux commands to generate large prime factors * Generate prime Candidates * ssh-keygen -G candidates -b 2048 * Note: * Use 1024 (or lesser) for faster and smaller prime number candidates generation, instead of 2048 text/html 2021-04-23T11:27:52+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/manully_encrypt_decrypt_files?rev=1619177272&do=diff Using OpenSSH Manually encrypt and decrypt files # Generating keys and encrypt/decrypt files using OpenSSL PRIVATE_KEY=private1.pem PUBLIC_KEY=public1.pem PLAIN_TEXT=secrets.txt ENCRY_TEXT=${PLAIN_TEXT}.enc PLAIN_TEXT1=secrets1.txt # # Generate Private and Public Keys openssl genrsa -out $PRIVATE_KEY 8192 openssl rsa -in $PRIVATE_KEY -outform PEM -pubout -out $PUBLIC_KEY # Encrypt openssl rsautl -encrypt -in $PLAIN_TEXT -out $ENCRY_TEXT -pubin -inkey $PUBLIC_KEY # Decrypt openssl rsautl -decry… text/html 2021-06-28T11:27:30+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/nagios_plugin_apc_ups?rev=1624879650&do=diff Nagios Plugin for APC UPS Metric collection and alerting #!/bin/bash # # Check USP Metrics for APC UPS # Written by Senthil Nathan # Last Modified: June 26th 2021 # # Usage: ./check_ups_metrics -w Time Left Warn -c Time Left Critical # # Description: Check UPS Metrics and warn on remaining minutes # # Output: # # # # PROGNAME=`/usr/bin/basename $0` PROGPATH=`echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,'` REVISION="1.0" . $PROGPATH/utils.sh check_root() { # make sure script is running as ro… text/html 2015-10-28T11:28:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/nagios_plugin_deleted_open_files?rev=1446031680&do=diff Nagios plugin to get total size of Deleted-Open files Nagios plugin to uses the lsof command and counts all open file sizes which are deleted. Alert if size exceeds specified warning and critical limits. E.g. to report warning if total size of deleted files exceed 5M and critical if it exceeds 10M text/html 2014-11-27T12:47:33+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/nagios_plugin_fp?rev=1417092453&do=diff Nagios plugin for File Permissions Nagios plugin to compare the file permissions of a file or directory against the actual permissions. For example use this plugin to check if /tmp in fact has the correct file mode of 1777, or if $HOME/.ssh has a mode of 600. text/html 2017-09-30T11:25:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/nagios_plugin_http_log?rev=1506770715&do=diff Nagios Plugin for scanning HTTP Log #!/bin/bash # # Apache access log line count & response times # Written by Senthil Nathan # Last Modified: June 1st 2017 # # Usage: ./http_stat -f access_log_file -g search_pattern -w Count Warn -c Count Critical (there are more options!!!) # # Description: Count the number of lines in apache access log for the previous minute # # This plugin is to check the lines generated by the log in the previosu minute # Assumes apache log time stamp of format "%d/%b/%Y… text/html 2017-12-26T12:26:20+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/nagios?rev=1514291180&do=diff Nagios Custom commands Processes Update /etc/nagios-plugins/config/procs.cfg to # check count of given process is running # ARG1 = # of processes # ARG2 = Process Name define command{ command_name check_procs_specific command_line /usr/lib/nagios/plugins/check_procs -w '$ARG1$':'$ARG1$' -c '$ARG1$':1024 -C '$ARG2$' } text/html 2016-11-18T12:25:05+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/pptp_vpn_routing?rev=1479471905&do=diff PPTP VPN and Local LAN Routing Typically when you VPN into a Network, all traffic including internet traffic gets routed to that VPN Network. This is of course unnecessary and mostly undesirable for reasons such as * The connection becomes slow with the longer route. text/html 2014-11-15T18:42:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/sitemap?rev=1416076963&do=diff text/html 2026-04-18T11:27:02+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/start?rev=1776511622&do=diff Tech Tech/apache * apache_reverse_proxy * apache_ssl_error * apache_webserver_tuning * enabling_mod_security * log_parsing * md_files * redirect_to_https Tech/codecharge * advanced_security_settings * application_builder * creating_currently_logged_in_as_label * default_user_id_to_logged_in_user * filter_on_logged_in_user * login * main * make_a_field_dynamically_readonly * new_project * project_settings * removing_params_from_menu_builder_url * setting_… text/html 2014-11-15T15:13:42+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/system_clock_losing_time?rev=1416064422&do=diff Notes on System Clock Losing Time Some resources if your system is losing time Resources * [ubuntu] A solution to clock drift (clock too slow or fast) [Archive] - Ubuntu Forums * adjtimex to adjust system clock * [ubuntu] 9.10 system clock runs slow - Ubuntu Forums text/html 2018-07-02T11:27:36+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/wondercms?rev=1530530856&do=diff WonderCMS Notes Install steps * Download & Unzip * Copy .htaccess into the apache configuration (remove Options -Indexes & ServerSignature Off) * Go to Settings -> Security * Change loginURL to something else (e.g. sslogin) Make note of the change!