CentOS 7
Active Directory with SSSD
(2021-02-03) Rough Notes install realmd # realm discover # realm join zoneName -U adminUser i...
arp
(2016-11-22) Problem arp -a is too brief. In keeping with the new trend of banging in long comman...
Auto SSH Agent
(2019-09-04) Notes that probably won't make any sense to anyone other than myself. This is border...
DSA SSH Hostkeys
(2017-05-25) Problem I have a stone-age host monitor thing that is complaining that it can't find...
Get Sendmail To Listen On 25, 425, and 587
(2017-05-03) Problem I want one sendmail.cf to control access to port 25 (no auth, access rules o...
grub parameters
(2017-09-13) Changing Grub Parameters With Grubby for KERNEL in /boot/vmlinuz-*; do grubby --...
hostname
(2016-11-21) Problem Setting the computer's hostname hasn't changed for the last 20 years or so. ...
Install Grub
(2018-08-21) Problem RHEL 7 doesn't have "grub" command for making RAID-1 disks bootable. Alleged...
journalctl
(2019-09-11) Examples # journalctl -u vmtoolsd --since=today # journalctl -u sshd
Passwordless SSH On NFS Home Dirs
(2017-04-28) Problem Can't use passwordless ssh to a target system. Solution In this particular c...
PHP 7
(2021-02-23) Installing PHP 7 Instructions for7.4 Older information (2017-09-13) CentOS 7 provide...
slow ssh connections
(5 September 2019) Problem When I ssh login to a CentOS 7 system, it always takes around 30 secon...
SSH no matching cypher
(2019-03-15) Problem Unable to negotiate with $IP port 22: no matching cipher found. Their offer:...
SSL Certificate Warning
(2014-01-20) Problem Email: ################# SSL Certificate Warning ################ Certifi...
Start Interface With No IP Address
(2018-06-19) Problem I want a network interface on my CentOS 7 system to start at boot time but I...
systemd
God Damnit What How List services systemctl list-unit-files Start service at boot time s...
Test Sendmail TLS Certificate
(2017-05-04) Problem Test Sendmail's TLS configuration. Solution $ openssl s_client -starttls smt...
tftp-server
(2018-01-12) Problem I need a tftp server on CentOS 7. Solution # yum -y install tftp-server xine...
Unban IP Address
(2017-05-06) Solution # fail2ban-client set sshd unbanip a.b.c.d
VM Interface Bouncing
(2019-09-13) Problem VM transplanted between two VMware clusters. Ran fine in old cluster for two...
vsftp: 500 OOPS: chroot
Problem vsftpd in user chroot mode. When logging in, you get: 500 OOPS: chroot Solution You have...