SysAdminDoc

System Document is in Wiki

Initially, would like to have all my Linux system admin written here but checking on some of my bash script gist and found some outdated. Better push the updated ones here as well. It will slowly push as it requires to revise first for more generic use or less edit.

scripts

suggest to have these scripts in /opt/scripts. Have to edit some variables to suitable your environment e.g. BAKDIR, LOGDIR, and etc. Those variables normally define at the top of script.

• chkport.sh for checking the service network port, it requires nc which may not be available on some Linux distro. Search for one for its replacement.

• dbbak.sh script to do the Postgresql DBs dump and compress.

• chkdskspace.sh provide the disk space info.

extras

contain the extra scripts which require other external services and do a very specific job.

• updipv6.sh to update the IPv6 to dynv6.com to maintain the accessibility via domain name.

sample use

normally, those scripts will be put in cron job. Learn how to schedule a job at https://crontab.guru

$ crontab -e

0	8,18	*	*	*	/opt/scripts/chkdskspace.sh

*/2	*	*	*	*	/opt/scripts/chkport.sh 192.168.1.200 443 HTTPS
*/2	*	*	*	*	/opt/scripts/chkport.sh 192.168.1.200 22 SSH
*/2	*	*	*	*	/opt/scripts/chkport.sh 192.168.1.201 5432 Postgresql

# update the IPv6 DDNS
*/5 *   *   *   *   /opt/scripts/extras/updipv6.sh

For postgresql db backup, have to run under postgres account

$ sudo su postgres

$ crontab -e

0	0	*	*	*	/opt/scripts/dbbak.sh

disclaimer

Use it on your own risk. All bash scripts run well on my Debian/Rasbain 10 buster.