Adjust Certwatch warning period
I set up my LetsEncrypt renewal cron to run just once a week. This causes certwatch to trip because it is set to alarm on any cert that needs to be renewed in < 30 days. to adjust the Certwatch … Continue reading →
Category Archives: Centos 7
Recover lost root password on Centos / Redhat version 7 or 8 systems
You will need console access – either a physical keyboard and monitor locally, or using the Virtual Machine remote console. You will need to be able to control the boot process. Reboot the machine. When the bootloader selection screen … Continue reading →
systemctl restart someservice returns “Error: No space left on device”
If you have sufficient disk space and you are running Code42/Crashplan pro and you get “Error: No space left on device” when you use systemctl, this may be the fix Linux performs real-time file watching using the inotify API. Inotify … Continue reading →
Turn off wifi radio in Linux / Centos
I have a few boxes that have built in wifi and I dont need it turned on. So I turn it off using the following command nmcli radio wifi off To make sure the wifi radio stays turned off in … Continue reading →
Route email destined for a selected domain to /dev/null
I wanted to do some testing with some forms on my web site, but I did not want to deal with the resultant output going to email. I added the following line to the /etc/postfix/transport file fubar.com discard Then I … Continue reading →
SSH WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
You go to ssh to a system and you get the following message @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: POSSIBLE DNS SPOOFING DETECTED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ The ECDSA host key for server.domain.com has changed, and the key for the corresponding IP address 10.128.15.2 is … Continue reading →
Show available wifi networks
nmcli dev wifi nmcli -f ALL dev wifi For more information see here
Continue reading →How to disable PackageKit on CentOS 7
Problem: You go to install a package with yum command on CentOS and you get the error saying that “Another app is currently holding the yum lock; waiting for it to exit… The other application is: PackageKit”. PackageKit get launched … Continue reading →
xfreerdp and Cache Glyph
Problem: xfreerdp starts up with the following messages [14:51:24:005] [14065:14066] [ERROR][com.freerdp.core.update] – [0x03] Cache Glyph – SERVER BUG: The support for this feature was not announced! Use /relax-order-checks to ignore [14:51:24:005] [14065:14066] [ERROR][com.freerdp.core.update] – order flags 03 failed [14:51:24:005] [14065:14066] … Continue reading →
Updating Dell srvadmin-omilcore package signature verification failure
Updating or installing Dell’s srvadmin package and you got this: warning: /var/cache/yum/x86_64/7/dell-system-update_dependent/packages/srvadmin-omilcore-9.1.0-3013.13047.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 34d8786f: NOKEY Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-Dell-DSU The GPG keys listed for the “dell-system-update_dependent” repository are already installed but they are not correct … Continue reading →