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(2019-09-04) Notes that probably won't make any sense to anyone other than myself. This is border...

(2017-05-25) Problem I have a stone-age host monitor thing that is complaining that it can't find...

(2017-05-06) Solution # fail2ban-client set sshd unbanip a.b.c.d

(2017-05-03) Problem I want one sendmail.cf to control access to port 25 (no auth, access rules o...

(2017-09-13) Changing Grub Parameters With Grubby for KERNEL in /boot/vmlinuz-*; do grubby --...

(2016-11-21) Problem Setting the computer's hostname hasn't changed for the last 20 years or so. ...

(2018-08-21) Problem RHEL 7 doesn't have "grub" command for making RAID-1 disks bootable. Alleged...

(2019-09-11) Examples # journalctl -u vmtoolsd --since=today # journalctl -u sshd

(2017-04-28) Problem Can't use passwordless ssh to a target system. Solution In this particular c...

(2021-02-23) Installing PHP 7 Instructions for7.4 Older information (2017-09-13) CentOS 7 provide...

(2019-03-15) Problem Unable to negotiate with $IP port 22: no matching cipher found. Their offer:...

(5 September 2019) Problem When I ssh login to a CentOS 7 system, it always takes around 30 secon...

(2014-01-20) Problem Email: ################# SSL Certificate Warning ################ Certifi...

(2018-06-19) Problem I want a network interface on my CentOS 7 system to start at boot time but I...

God Damnit What How List services systemctl list-unit-files Start service at boot time s...

(2017-05-04) Problem Test Sendmail's TLS configuration. Solution $ openssl s_client -starttls smt...

(2018-01-12) Problem I need a tftp server on CentOS 7. Solution # yum -y install tftp-server xine...

(2019-09-13) Problem VM transplanted between two VMware clusters. Ran fine in old cluster for two...

Problem vsftpd in user chroot mode. When logging in, you get: 500 OOPS: chroot Solution You have...

(2020-05-03) Docker on CentOS 8 # dnf config-manager --add-repo=https://download.docker.com/linux...