DevOps Utilities You May Find Useful
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rbc (Reboot checker)
- On RHEL 7 / CentOS 7 / Fedora requires: coreutils gawk hostname lsof mailx rpm sed util-linux
- Default is to check if the system needs to be rebooted
- Add a flag to alert via email, log to syslog, or to reboot the system if required
- Tested on Fedora / RHEL
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libreswan-key-to-conf
- Take a list of names, IPs, and RSA public keys and output libreswan configuration
- A separate IPSec SA is created between each of the hosts listed in the input file
- Growth is #conf_items = (num_hosts*(num_hosts-1))/2
- Tested on RHEL 7
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dnscheck
- This is a dumb (unintelligent) utility designed to check DNS server health over time
- Output can be graphed with gnuplot
- Designed to be run from cron and STDOUT redirected to a file:
*/5 * * * * /home/user/bin/dnscheck <DNS SERVER IP> >> /home/user/bin/dns-stats -
yum.upgrade / dnf.upgrade
- Stupid simple method to update all packages on a RHEL / CentOS / Fedora machine
- yum.upgrade for RHEL / CentOS, dnf.upgrade for Fedora
- Why? Because 'yum-cron' has only hourly or daily schedules, at fixed times
- Place it in /usr/local/libexec
- This can be called from cron at any schedule cron can perform, e.g.:
00 07 * * * root /usr/local/libexec/yum.upgrade- Works on RHEL & CentOS 5, 6, & 7, the same way
- Now sends email when error is generated (yum.upgrade)
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test-vhosts-from-httpd
- Much like it sounds
- use the shell command commented out at the top of the script to gather what vhosts are provided
- using that saved information, you can run this script elsewhere to test all those vhosts
- not perfect, but a sanity check to say, this is what happened before and after
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reboot-test.php
- PHP based web page
- prints hostname
- prints load averages
- displays background.jpg
- checks if systemd is going to reboot the system soon
- returns 503 when reboot is imminent so load balancers can remove system from the pool