Notes and Stuff
SSL stands for secure socket layer, a web protocol used to send traffic between the client and the server in a protected and encrypted wrapper. An SSL certificate also helps users verifying the identity of the sites they’re visiting.
httpdmod_sslHere’s a tiny plugin to check if a systemd service is running:
#!/bin/bash
#
# машины
#
# Check a if a systemd service is running
#
# Usage: $0
#
#Nagios exit codes
OK=0
WARNING=1
CRITICAL=2
UNKNOWN=3
SERVICE=$1
# Check service status
systemctl -q is-active $SERVICE
if [[ $? -ne 0 ]]; then
echo "ERROR: service $SERVICE is not running"
exit $CRITICAL
fi
echo "OK: service $SERVICE is running"
exit $OK
By default settings, Nagios will send email notifications as nagios@localhost, identified by $ADMINEMAIL$ macro.
If you want to change this behavior, you need to set the email address you want to use in the nagios.cfg file:
# ADMINISTRATOR EMAIL/PAGER ADDRESSES
# The email and pager address of a global administrator (likely you).
# Nagios never uses these values itself, but you can access them by
# using the $ADMINEMAIL$ and $ADMINPAGER$ macros in your notification
# commands.
admin_email=nagios@localhost
admin_pager=pagenagios@localhost
Welcome back to my (almost) daily appointment with “What’s wrong with Fedora today?”.
At work, our servers are VMs on a VMware vSphere; we access them using SSH of course, but sometimes we need to use the remote console from the vSphere Web Client (that is a vmrc link). I upgraded my kernel (and many libraries) last week but since I don’t use vSphere that often, I didn’t noticed anything until a couple of days ago, when a RAM stick failed and our machines crashed, rebooting in emergency mode.
Usually you login, select your VM, click on Launch Remote Console and you’re done. Unfortunately I got this:
reason appLoader killed by signal 11 cmdline /usr/lib/vmware/bin/vmrc executable /usr/lib/vmware/bin/appLoader [...] os_release Fedora release 26 (Twenty Six) kernel 4.12.11-300.fc26.x86_64
I upgraded to Fedora 26 weeks ago but I realize only today that I was having issues playing videos in Firefox, while I was trying to attend an online course.
At first I thought it was Flash Player’s fault: I always forget to have it and I always forget to update it. It was indeed out-of-date but the annoying “The media could not be played” error message was still there.
After a quick research and a little help from HTML5test, I noticed that few codecs were missing. I prefer not to install a bunch of codecs that I don’t even know what they’re for; if I am missing something I’m pretty sure it’ll come out! Continue reading
I’ve never ever had any problem using fingerprint authentication on openSUSE 42.1, it worked just out of the box, but when I switched back to Fedora (again), I had some issues configuring it.
On Fedora 26, by default, fingerprint authentication works only for logins but not for sudo. To enable this:
authconfig --enablefingerprint --update
If you’re using an older version of Fedora you can also use:
authconfig-tui
You can flush and reset iptables to default running these commands:
iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT
The -F command flushes all the chains and -X deletes empty (non-default) chains.
You can also create a script:Continue reading
When you issue a sudo command you will be asked to type your password to execute it and this can be quite annoying, especially for people like me that open the terminal every 3 minutes and don’t want to login as root every time.
To solve this “problem” you need to edit sudo’s configuration file, located in /etc/sudoers, but it’s not recommended to do it directly. To modify this file, you have to use visudo that makes a temporary copy of the sudoers file and checks for errors before saving.Continue reading